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237.2.67
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-09 02:01:13 UTC
- mto: (24.1.133 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090209020113-726hq380zvp8zt97
Four new interrelated features:
1. Support using a different network interface via both initramfs.conf
(the DEVICE setting) and the kernel command line (sixth field of
the "ip=" option as in Linux' Documentation/nfsroot.txt).
2. Support connecting to a specified Mandos server directly using a
kernel command line option ("mandos=connect:<ADDRESS>:<PORT>").
3. Support connecting directly to an IPv4 address (and port) using the
"--connect" option of mandos-client.
4. Support an empty string to the --interface option to mandos-client.
* Makefile (WARN): Increase strictness by changing to
"-Wstrict-aliasing=1".
* debian/mandos-client.README.Debian (Use the Correct Network
Interface): Changed to refer to initramfs.conf and nfsroot.txt.
(Test the Server): Improve wording.
(Non-local Connection): New section.
* initramfs-tools-script: Obey DEVICE environment variable and setting
from "/conf/initramfs.conf". Also let any
"ip=" kernel command line option override
it. Support new "mandos=connect" option.
Call "configure_networking" to set up IP
address on interface if necessary.
* plugin-runner.conf: Change example.
* plugins.d/mandos-client.c: Some whitespace and comment changes.
(start_mandos_communication): Take an additional argument for
address family, all callers changed.
Connect to an IPv4 address if address
family is AF_INET. Only set IPv6
scope_id for link-local addresses.
(main): Accept empty interface name; this will not bring up any
interface and leave the interface as unspecified. Also do
not restore kernel log level if lowering it failed.
* plugins.d/mandos-client.xml (OPTIONS): Document that the
"--interface" option accepts
an empty string.
(EXAMPLE): Change example IPv6 address to a link-local address.
1. Support using a different network interface via both initramfs.conf
(the DEVICE setting) and the kernel command line (sixth field of
the "ip=" option as in Linux' Documentation/nfsroot.txt).
2. Support connecting to a specified Mandos server directly using a
kernel command line option ("mandos=connect:<ADDRESS>:<PORT>").
3. Support connecting directly to an IPv4 address (and port) using the
"--connect" option of mandos-client.
4. Support an empty string to the --interface option to mandos-client.
* Makefile (WARN): Increase strictness by changing to
"-Wstrict-aliasing=1".
* debian/mandos-client.README.Debian (Use the Correct Network
Interface): Changed to refer to initramfs.conf and nfsroot.txt.
(Test the Server): Improve wording.
(Non-local Connection): New section.
* initramfs-tools-script: Obey DEVICE environment variable and setting
from "/conf/initramfs.conf". Also let any
"ip=" kernel command line option override
it. Support new "mandos=connect" option.
Call "configure_networking" to set up IP
address on interface if necessary.
* plugin-runner.conf: Change example.
* plugins.d/mandos-client.c: Some whitespace and comment changes.
(start_mandos_communication): Take an additional argument for
address family, all callers changed.
Connect to an IPv4 address if address
family is AF_INET. Only set IPv6
scope_id for link-local addresses.
(main): Accept empty interface name; this will not bring up any
interface and leave the interface as unspecified. Also do
not restore kernel log level if lowering it failed.
* plugins.d/mandos-client.xml (OPTIONS): Document that the
"--interface" option accepts
an empty string.
(EXAMPLE): Change example IPv6 address to a link-local address.
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
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* This program is free software: you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
26
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* along with this program. If not, see
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* <http://www.gnu.org/licenses/>.
28
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*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
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38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
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#include <stdint.h> /* uint16_t, uint32_t */
45
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#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
48
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#include <stdbool.h> /* bool, false, true */
49
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#include <string.h> /* memset(), strcmp(), strlen(),
50
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strerror(), asprintf(), strcpy() */
53
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sockaddr_in6, PF_INET6,
54
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SOCK_STREAM, uid_t, gid_t, open(),
55
52
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
53
#include <sys/stat.h> /* open() */
57
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
55
inet_pton(), connect() */
59
56
#include <fcntl.h> /* open() */
60
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#include <dirent.h> /* opendir(), struct dirent, readdir()
61
58
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
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#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
68
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
64
SIOCSIFFLAGS, if_indextoname(),
70
65
if_nametoindex(), IF_NAMESIZE */
72
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
68
*/
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
78
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#include <iso646.h> /* not, or, and */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
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argp_state, struct argp,
81
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argp_parse(), ARGP_KEY_ARG,
82
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ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
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#ifdef __linux__
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#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
80
#endif
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/* Avahi */
96
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/* All Avahi types, constants and functions
110
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init_gnutls_session(),
111
98
GNUTLS_* */
112
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#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
100
/* gnutls_certificate_set_openpgp_key_file(),
101
GNUTLS_OPENPGP_FMT_BASE64 */
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/* GPGME */
117
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#include <gpgme.h> /* All GPGME types, constants and
125
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#define PATHDIR "/conf/conf.d/mandos"
126
113
#define SECKEY "seckey.txt"
127
114
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
115
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bool debug = false;
131
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static const char mandos_protocol_version[] = "1";
132
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const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
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/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
148
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149
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/* Used for passing in values through the Avahi callback functions */
150
122
typedef struct {
155
127
gnutls_dh_params_t dh_params;
156
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const char *priority;
157
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gpgme_ctx_t ctx;
158
server *current_server;
159
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} mandos_context;
160
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/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
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sig_atomic_t quit_now = 0;
168
int signal_received = 0;
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/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
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int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
182
program_invocation_short_name));
183
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
184
}
185
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/*
187
* Make additional room in "buffer" for at least BUFFER_SIZE more
188
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
189
135
* "buffer_length" is how much is already used.
190
136
*/
191
size_t incbuffer(char **buffer, size_t buffer_length,
192
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
193
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
194
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
195
141
if(buffer == NULL){
200
146
return buffer_capacity;
201
147
}
202
148
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/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
205
int af){
206
int ret;
207
server *new_server = malloc(sizeof(server));
208
if(new_server == NULL){
209
perror_plus("malloc");
210
return -1;
211
}
212
*new_server = (server){ .ip = strdup(ip),
213
.port = port,
214
.if_index = if_index,
215
.af = af };
216
if(new_server->ip == NULL){
217
perror_plus("strdup");
218
return -1;
219
}
220
/* Special case of first server */
221
if (mc.current_server == NULL){
222
new_server->next = new_server;
223
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
226
} else {
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
229
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
231
}
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
233
if(ret == -1){
234
perror_plus("clock_gettime");
235
return -1;
236
}
237
return 0;
238
}
239
240
149
/*
241
150
* Initialize GPGME.
242
151
*/
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
154
int ret;
245
155
gpgme_error_t rc;
246
156
gpgme_engine_info_t engine_info;
247
157
250
160
* Helper function to insert pub and seckey to the engine keyring.
251
161
*/
252
162
bool import_key(const char *filename){
253
int ret;
254
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int fd;
255
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gpgme_data_t pgp_data;
256
165
257
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
258
167
if(fd == -1){
259
perror_plus("open");
168
perror("open");
260
169
return false;
261
170
}
262
171
263
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
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if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
267
176
return false;
268
177
}
269
178
270
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
271
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if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
274
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return false;
275
184
}
276
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ret = (int)TEMP_FAILURE_RETRY(close(fd));
278
187
if(ret == -1){
279
perror_plus("close");
188
perror("close");
280
189
}
281
190
gpgme_data_release(pgp_data);
282
191
return true;
283
192
}
284
193
285
194
if(debug){
286
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
287
196
}
288
197
289
198
/* Init GPGME */
290
199
gpgme_check_version(NULL);
291
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
201
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
295
204
return false;
296
205
}
297
206
298
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
299
208
rc = gpgme_get_engine_info(&engine_info);
300
209
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
303
212
return false;
304
213
}
305
214
while(engine_info != NULL){
311
220
engine_info = engine_info->next;
312
221
}
313
222
if(engine_info == NULL){
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
315
tempdir);
223
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
316
224
return false;
317
225
}
318
226
319
227
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
321
229
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
324
gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
325
232
return false;
326
233
}
327
234
329
236
return false;
330
237
}
331
238
332
return true;
239
return true;
333
240
}
334
241
335
242
/*
336
243
* Decrypt OpenPGP data.
337
244
* Returns -1 on error
338
245
*/
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
340
248
size_t crypto_size,
341
249
char **plaintext){
342
250
gpgme_data_t dh_crypto, dh_plain;
346
254
ssize_t plaintext_length = 0;
347
255
348
256
if(debug){
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
257
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
350
258
}
351
259
352
260
/* Create new GPGME data buffer from memory cryptotext */
353
261
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
354
262
0);
355
263
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
264
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
358
266
return -1;
359
267
}
360
268
361
269
/* Create new empty GPGME data buffer for the plaintext */
362
270
rc = gpgme_data_new(&dh_plain);
363
271
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
272
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
367
274
gpgme_data_release(dh_crypto);
368
275
return -1;
369
276
}
370
277
371
278
/* Decrypt data from the cryptotext data buffer to the plaintext
372
279
data buffer */
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
374
281
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
283
gpgme_strsource(rc), gpgme_strerror(rc));
377
284
plaintext_length = -1;
378
285
if(debug){
379
286
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
381
288
if(result == NULL){
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
383
290
} else {
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
291
fprintf(stderr, "Unsupported algorithm: %s\n",
292
result->unsupported_algorithm);
293
fprintf(stderr, "Wrong key usage: %u\n",
294
result->wrong_key_usage);
388
295
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
296
fprintf(stderr, "File name: %s\n", result->file_name);
390
297
}
391
298
gpgme_recipient_t recipient;
392
299
recipient = result->recipients;
393
while(recipient != NULL){
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
400
? "No" : "Yes");
401
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
402
310
}
403
311
}
404
312
}
406
314
}
407
315
408
316
if(debug){
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
317
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
410
318
}
411
319
412
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
413
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
414
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
415
323
plaintext_length = -1;
416
324
goto decrypt_end;
417
325
}
418
326
419
327
*plaintext = NULL;
420
328
while(true){
421
plaintext_capacity = incbuffer(plaintext,
422
(size_t)plaintext_length,
423
plaintext_capacity);
329
plaintext_capacity = adjustbuffer(plaintext,
330
(size_t)plaintext_length,
331
plaintext_capacity);
424
332
if(plaintext_capacity == 0){
425
perror_plus("incbuffer");
426
plaintext_length = -1;
427
goto decrypt_end;
333
perror("adjustbuffer");
334
plaintext_length = -1;
335
goto decrypt_end;
428
336
}
429
337
430
338
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
435
343
break;
436
344
}
437
345
if(ret < 0){
438
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
439
347
plaintext_length = -1;
440
348
goto decrypt_end;
441
349
}
443
351
}
444
352
445
353
if(debug){
446
fprintf_plus(stderr, "Decrypted password is: ");
354
fprintf(stderr, "Decrypted password is: ");
447
355
for(ssize_t i = 0; i < plaintext_length; i++){
448
356
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
449
357
}
471
379
/* GnuTLS log function callback */
472
380
static void debuggnutls(__attribute__((unused)) int level,
473
381
const char* string){
474
fprintf_plus(stderr, "GnuTLS: %s", string);
382
fprintf(stderr, "GnuTLS: %s", string);
475
383
}
476
384
477
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
478
387
const char *seckeyfilename){
479
388
int ret;
480
389
481
390
if(debug){
482
fprintf_plus(stderr, "Initializing GnuTLS\n");
391
fprintf(stderr, "Initializing GnuTLS\n");
483
392
}
484
393
485
394
ret = gnutls_global_init();
486
395
if(ret != GNUTLS_E_SUCCESS){
487
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
488
safer_gnutls_strerror(ret));
396
fprintf(stderr, "GnuTLS global_init: %s\n",
397
safer_gnutls_strerror(ret));
489
398
return -1;
490
399
}
491
400
498
407
}
499
408
500
409
/* OpenPGP credentials */
501
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
502
411
if(ret != GNUTLS_E_SUCCESS){
503
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
504
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
from
414
-Wunreachable-code
415
*/
416
safer_gnutls_strerror(ret));
505
417
gnutls_global_deinit();
506
418
return -1;
507
419
}
508
420
509
421
if(debug){
510
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
511
" secret key %s as GnuTLS credentials\n",
512
pubkeyfilename,
513
seckeyfilename);
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
424
seckeyfilename);
514
425
}
515
426
516
427
ret = gnutls_certificate_set_openpgp_key_file
517
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
518
429
GNUTLS_OPENPGP_FMT_BASE64);
519
430
if(ret != GNUTLS_E_SUCCESS){
520
fprintf_plus(stderr,
521
"Error[%d] while reading the OpenPGP key pair ('%s',"
522
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
523
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
524
safer_gnutls_strerror(ret));
431
fprintf(stderr,
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
525
436
goto globalfail;
526
437
}
527
438
528
439
/* GnuTLS server initialization */
529
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
530
441
if(ret != GNUTLS_E_SUCCESS){
531
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
532
" initialization: %s\n",
533
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
534
444
goto globalfail;
535
445
}
536
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
537
447
if(ret != GNUTLS_E_SUCCESS){
538
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
539
safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
540
450
goto globalfail;
541
451
}
542
452
543
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
544
454
545
455
return 0;
546
456
547
457
globalfail:
548
458
549
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
550
460
gnutls_global_deinit();
551
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
552
462
return -1;
553
463
}
554
464
555
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
556
467
int ret;
557
468
/* GnuTLS session creation */
558
do {
559
ret = gnutls_init(session, GNUTLS_SERVER);
560
if(quit_now){
561
return -1;
562
}
563
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
564
470
if(ret != GNUTLS_E_SUCCESS){
565
fprintf_plus(stderr,
566
"Error in GnuTLS session initialization: %s\n",
567
safer_gnutls_strerror(ret));
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
472
safer_gnutls_strerror(ret));
568
473
}
569
474
570
475
{
571
476
const char *err;
572
do {
573
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
574
if(quit_now){
575
gnutls_deinit(*session);
576
return -1;
577
}
578
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
579
478
if(ret != GNUTLS_E_SUCCESS){
580
fprintf_plus(stderr, "Syntax error at: %s\n", err);
581
fprintf_plus(stderr, "GnuTLS error: %s\n",
582
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Syntax error at: %s\n", err);
480
fprintf(stderr, "GnuTLS error: %s\n",
481
safer_gnutls_strerror(ret));
583
482
gnutls_deinit(*session);
584
483
return -1;
585
484
}
586
485
}
587
486
588
do {
589
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
590
mc.cred);
591
if(quit_now){
592
gnutls_deinit(*session);
593
return -1;
594
}
595
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
596
489
if(ret != GNUTLS_E_SUCCESS){
597
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
598
safer_gnutls_strerror(ret));
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
491
safer_gnutls_strerror(ret));
599
492
gnutls_deinit(*session);
600
493
return -1;
601
494
}
602
495
603
496
/* ignore client certificate if any. */
604
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
605
499
606
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
607
501
608
502
return 0;
609
503
}
615
509
/* Called when a Mandos server is found */
616
510
static int start_mandos_communication(const char *ip, uint16_t port,
617
511
AvahiIfIndex if_index,
618
int af){
619
int ret, tcp_sd = -1;
512
mandos_context *mc, int af){
513
int ret, tcp_sd;
620
514
ssize_t sret;
621
515
union {
622
516
struct sockaddr_in in;
623
517
struct sockaddr_in6 in6;
624
518
} to;
625
519
char *buffer = NULL;
626
char *decrypted_buffer = NULL;
520
char *decrypted_buffer;
627
521
size_t buffer_length = 0;
628
522
size_t buffer_capacity = 0;
523
ssize_t decrypted_buffer_size;
629
524
size_t written;
630
int retval = -1;
525
int retval = 0;
631
526
gnutls_session_t session;
632
527
int pf; /* Protocol family */
633
528
634
errno = 0;
635
636
if(quit_now){
637
errno = EINTR;
638
return -1;
639
}
640
641
529
switch(af){
642
530
case AF_INET6:
643
531
pf = PF_INET6;
646
534
pf = PF_INET;
647
535
break;
648
536
default:
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
650
errno = EINVAL;
537
fprintf(stderr, "Bad address family: %d\n", af);
651
538
return -1;
652
539
}
653
540
654
ret = init_gnutls_session(&session);
541
ret = init_gnutls_session(mc, &session);
655
542
if(ret != 0){
656
543
return -1;
657
544
}
658
545
659
546
if(debug){
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
547
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
548
"\n", ip, port);
662
549
}
663
550
664
551
tcp_sd = socket(pf, SOCK_STREAM, 0);
665
552
if(tcp_sd < 0){
666
int e = errno;
667
perror_plus("socket");
668
errno = e;
669
goto mandos_end;
670
}
671
672
if(quit_now){
673
errno = EINTR;
674
goto mandos_end;
553
perror("socket");
554
return -1;
675
555
}
676
556
677
557
memset(&to, 0, sizeof(to));
678
558
if(af == AF_INET6){
679
to.in6.sin6_family = (sa_family_t)af;
559
to.in6.sin6_family = (uint16_t)af;
680
560
ret = inet_pton(af, ip, &to.in6.sin6_addr);
681
561
} else { /* IPv4 */
682
562
to.in.sin_family = (sa_family_t)af;
683
563
ret = inet_pton(af, ip, &to.in.sin_addr);
684
564
}
685
565
if(ret < 0 ){
686
int e = errno;
687
perror_plus("inet_pton");
688
errno = e;
689
goto mandos_end;
566
perror("inet_pton");
567
return -1;
690
568
}
691
569
if(ret == 0){
692
int e = errno;
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
694
errno = e;
695
goto mandos_end;
570
fprintf(stderr, "Bad address: %s\n", ip);
571
return -1;
696
572
}
697
573
if(af == AF_INET6){
698
574
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
577
702
578
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
579
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
704
-Wunreachable-code*/
580
-Wunreachable-code*/
705
581
if(if_index == AVAHI_IF_UNSPEC){
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
708
errno = EINVAL;
709
goto mandos_end;
582
fprintf(stderr, "An IPv6 link-local address is incomplete"
583
" without a network interface\n");
584
return -1;
710
585
}
711
586
/* Set the network interface number as scope */
712
587
to.in6.sin6_scope_id = (uint32_t)if_index;
717
592
-Wunreachable-code */
718
593
}
719
594
720
if(quit_now){
721
errno = EINTR;
722
goto mandos_end;
723
}
724
725
595
if(debug){
726
596
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
597
char interface[IF_NAMESIZE];
728
598
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
599
perror("if_indextoname");
730
600
} else {
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
601
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
602
ip, interface, port);
733
603
}
734
604
} else {
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
736
ip, port);
605
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
606
port);
737
607
}
738
608
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
609
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
746
616
sizeof(addrstr));
747
617
}
748
618
if(pcret == NULL){
749
perror_plus("inet_ntop");
619
perror("inet_ntop");
750
620
} else {
751
621
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
622
fprintf(stderr, "Canonical address form: %s\n", addrstr);
753
623
}
754
624
}
755
625
}
756
626
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
760
}
761
762
627
if(af == AF_INET6){
763
628
ret = connect(tcp_sd, &to.in6, sizeof(to));
764
629
} else {
765
630
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
766
631
}
767
632
if(ret < 0){
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
769
int e = errno;
770
perror_plus("connect");
771
errno = e;
772
}
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
errno = EINTR;
778
goto mandos_end;
633
perror("connect");
634
return -1;
779
635
}
780
636
781
637
const char *out = mandos_protocol_version;
783
639
while(true){
784
640
size_t out_size = strlen(out);
785
641
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
786
out_size - written));
642
out_size - written));
787
643
if(ret == -1){
788
int e = errno;
789
perror_plus("write");
790
errno = e;
644
perror("write");
645
retval = -1;
791
646
goto mandos_end;
792
647
}
793
648
written += (size_t)ret;
801
656
break;
802
657
}
803
658
}
804
805
if(quit_now){
806
errno = EINTR;
807
goto mandos_end;
808
}
809
659
}
810
660
811
661
if(debug){
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
813
}
814
815
if(quit_now){
816
errno = EINTR;
817
goto mandos_end;
818
}
819
820
/* Spurious warning from -Wint-to-pointer-cast */
662
fprintf(stderr, "Establishing TLS session with %s\n", ip);
663
}
664
821
665
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
822
666
823
if(quit_now){
824
errno = EINTR;
825
goto mandos_end;
826
}
827
828
do {
667
do{
829
668
ret = gnutls_handshake(session);
830
if(quit_now){
831
errno = EINTR;
832
goto mandos_end;
833
}
834
669
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
835
670
836
671
if(ret != GNUTLS_E_SUCCESS){
837
672
if(debug){
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
673
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
839
674
gnutls_perror(ret);
840
675
}
841
errno = EPROTO;
676
retval = -1;
842
677
goto mandos_end;
843
678
}
844
679
845
680
/* Read OpenPGP packet that contains the wanted password */
846
681
847
682
if(debug){
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
849
" %s\n", ip);
683
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
684
ip);
850
685
}
851
686
852
687
while(true){
853
854
if(quit_now){
855
errno = EINTR;
856
goto mandos_end;
857
}
858
859
buffer_capacity = incbuffer(&buffer, buffer_length,
860
buffer_capacity);
688
buffer_capacity = adjustbuffer(&buffer, buffer_length,
689
buffer_capacity);
861
690
if(buffer_capacity == 0){
862
int e = errno;
863
perror_plus("incbuffer");
864
errno = e;
865
goto mandos_end;
866
}
867
868
if(quit_now){
869
errno = EINTR;
691
perror("adjustbuffer");
692
retval = -1;
870
693
goto mandos_end;
871
694
}
872
695
881
704
case GNUTLS_E_AGAIN:
882
705
break;
883
706
case GNUTLS_E_REHANDSHAKE:
884
do {
707
do{
885
708
ret = gnutls_handshake(session);
886
887
if(quit_now){
888
errno = EINTR;
889
goto mandos_end;
890
}
891
709
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
892
710
if(ret < 0){
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
894
"***\n");
711
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
895
712
gnutls_perror(ret);
896
errno = EPROTO;
713
retval = -1;
897
714
goto mandos_end;
898
715
}
899
716
break;
900
717
default:
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
718
fprintf(stderr, "Unknown error while reading data from"
719
" encrypted session with Mandos server\n");
720
retval = -1;
903
721
gnutls_bye(session, GNUTLS_SHUT_RDWR);
904
errno = EIO;
905
722
goto mandos_end;
906
723
}
907
724
} else {
910
727
}
911
728
912
729
if(debug){
913
fprintf_plus(stderr, "Closing TLS session\n");
914
}
915
916
if(quit_now){
917
errno = EINTR;
918
goto mandos_end;
919
}
920
921
do {
922
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
923
if(quit_now){
924
errno = EINTR;
925
goto mandos_end;
926
}
927
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
730
fprintf(stderr, "Closing TLS session\n");
731
}
732
733
gnutls_bye(session, GNUTLS_SHUT_RDWR);
928
734
929
735
if(buffer_length > 0){
930
ssize_t decrypted_buffer_size;
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
736
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
737
buffer_length,
932
738
&decrypted_buffer);
933
739
if(decrypted_buffer_size >= 0){
934
935
740
written = 0;
936
741
while(written < (size_t) decrypted_buffer_size){
937
if(quit_now){
938
errno = EINTR;
939
goto mandos_end;
940
}
941
942
742
ret = (int)fwrite(decrypted_buffer + written, 1,
943
743
(size_t)decrypted_buffer_size - written,
944
744
stdout);
945
745
if(ret == 0 and ferror(stdout)){
946
int e = errno;
947
746
if(debug){
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
949
strerror(errno));
747
fprintf(stderr, "Error writing encrypted data: %s\n",
748
strerror(errno));
950
749
}
951
errno = e;
952
goto mandos_end;
750
retval = -1;
751
break;
953
752
}
954
753
written += (size_t)ret;
955
754
}
956
retval = 0;
755
free(decrypted_buffer);
756
} else {
757
retval = -1;
957
758
}
759
} else {
760
retval = -1;
958
761
}
959
762
960
763
/* Shutdown procedure */
961
764
962
765
mandos_end:
963
{
964
int e = errno;
965
free(decrypted_buffer);
966
free(buffer);
967
if(tcp_sd >= 0){
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
969
}
970
if(ret == -1){
971
if(e == 0){
972
e = errno;
973
}
974
perror_plus("close");
975
}
976
gnutls_deinit(session);
977
errno = e;
978
if(quit_now){
979
errno = EINTR;
980
retval = -1;
981
}
766
free(buffer);
767
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
768
if(ret == -1){
769
perror("close");
982
770
}
771
gnutls_deinit(session);
983
772
return retval;
984
773
}
985
774
996
785
AVAHI_GCC_UNUSED AvahiStringList *txt,
997
786
AVAHI_GCC_UNUSED AvahiLookupResultFlags
998
787
flags,
999
AVAHI_GCC_UNUSED void* userdata){
788
void* userdata){
789
mandos_context *mc = userdata;
1000
790
assert(r);
1001
791
1002
792
/* Called whenever a service has been resolved successfully or
1003
793
timed out */
1004
794
1005
if(quit_now){
1006
return;
1007
}
1008
1009
795
switch(event){
1010
796
default:
1011
797
case AVAHI_RESOLVER_FAILURE:
1012
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1013
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1014
domain,
1015
avahi_strerror(avahi_server_errno(mc.server)));
798
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc->server)));
1016
801
break;
1017
802
1018
803
case AVAHI_RESOLVER_FOUND:
1020
805
char ip[AVAHI_ADDRESS_STR_MAX];
1021
806
avahi_address_snprint(ip, sizeof(ip), address);
1022
807
if(debug){
1023
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1024
PRIdMAX ") on port %" PRIu16 "\n", name,
1025
host_name, ip, (intmax_t)interface, port);
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
1026
811
}
1027
int ret = start_mandos_communication(ip, port, interface,
812
int ret = start_mandos_communication(ip, port, interface, mc,
1028
813
avahi_proto_to_af(proto));
1029
814
if(ret == 0){
1030
avahi_simple_poll_quit(mc.simple_poll);
1031
} else {
1032
ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
815
avahi_simple_poll_quit(mc->simple_poll);
1034
816
}
1035
817
}
1036
818
}
1046
828
const char *domain,
1047
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1048
830
flags,
1049
AVAHI_GCC_UNUSED void* userdata){
831
void* userdata){
832
mandos_context *mc = userdata;
1050
833
assert(b);
1051
834
1052
835
/* Called whenever a new services becomes available on the LAN or
1053
836
is removed from the LAN */
1054
837
1055
if(quit_now){
1056
return;
1057
}
1058
1059
838
switch(event){
1060
839
default:
1061
840
case AVAHI_BROWSER_FAILURE:
1062
841
1063
fprintf_plus(stderr, "(Avahi browser) %s\n",
1064
avahi_strerror(avahi_server_errno(mc.server)));
1065
avahi_simple_poll_quit(mc.simple_poll);
842
fprintf(stderr, "(Avahi browser) %s\n",
843
avahi_strerror(avahi_server_errno(mc->server)));
844
avahi_simple_poll_quit(mc->simple_poll);
1066
845
return;
1067
846
1068
847
case AVAHI_BROWSER_NEW:
1071
850
the callback function is called the Avahi server will free the
1072
851
resolver for us. */
1073
852
1074
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1075
name, type, domain, protocol, 0,
1076
resolve_callback, NULL) == NULL)
1077
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1078
" %s\n", name,
1079
avahi_strerror(avahi_server_errno(mc.server)));
853
if(!(avahi_s_service_resolver_new(mc->server, interface,
854
protocol, name, type, domain,
855
AVAHI_PROTO_INET6, 0,
856
resolve_callback, mc)))
857
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
858
name, avahi_strerror(avahi_server_errno(mc->server)));
1080
859
break;
1081
860
1082
861
case AVAHI_BROWSER_REMOVE:
1085
864
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
865
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1087
866
if(debug){
1088
fprintf_plus(stderr, "No Mandos server found, still"
1089
" searching...\n");
867
fprintf(stderr, "No Mandos server found, still searching...\n");
1090
868
}
1091
869
break;
1092
870
}
1093
871
}
1094
872
1095
/* Signal handler that stops main loop after SIGTERM */
1096
static void handle_sigterm(int sig){
1097
if(quit_now){
1098
return;
1099
}
1100
quit_now = 1;
1101
signal_received = sig;
1102
int old_errno = errno;
1103
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1106
}
1107
errno = old_errno;
1108
}
1109
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1111
int ret;
1112
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1114
if(s < 0){
1115
perror_plus("socket");
1116
return false;
1117
}
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1120
if(ret == -1){
1121
if(debug){
1122
perror_plus("ioctl SIOCGIFFLAGS");
1123
}
1124
return false;
1125
}
1126
return true;
1127
}
1128
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1130
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1133
if(debug){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1135
ifname);
1136
}
1137
return false;
1138
}
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1141
if(debug){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1144
}
1145
return true;
1146
}
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1149
if(debug){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1152
}
1153
return false;
1154
}
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1157
if(debug){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1159
ifname);
1160
}
1161
return false;
1162
}
1163
1164
/* Accept this device */
1165
if(debug){
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1167
}
1168
return true;
1169
}
1170
1171
/*
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1175
*/
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1178
return 0;
1179
}
1180
1181
struct ifreq ifr;
1182
if(not get_flags(if_entry->d_name, &ifr)){
1183
if(debug){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1186
}
1187
return 0;
1188
}
1189
1190
if(not good_flags(if_entry->d_name, &ifr)){
1191
return 0;
1192
}
1193
return 1;
1194
}
1195
1196
/*
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1200
*/
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1203
return 0;
1204
}
1205
1206
struct ifreq ifr;
1207
if(not get_flags(if_entry->d_name, &ifr)){
1208
if(debug){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1211
}
1212
return 0;
1213
}
1214
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1217
if(debug){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1219
if_entry->d_name);
1220
}
1221
return 0;
1222
}
1223
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1226
if(debug){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1228
if_entry->d_name);
1229
}
1230
return 0;
1231
}
1232
1233
if(not good_flags(if_entry->d_name, &ifr)){
1234
return 0;
1235
}
1236
return 1;
1237
}
1238
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1245
return 0;
1246
}
1247
return 1;
1248
}
1249
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1252
int ret;
1253
size_t sret;
1254
struct stat st;
1255
1256
if((direntry->d_name)[0] == '\0'){
1257
/* Empty name? */
1258
return 0;
1259
}
1260
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1263
"0123456789"
1264
"_-");
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1267
if(debug){
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1269
direntry->d_name);
1270
}
1271
return 0;
1272
}
1273
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1276
if(ret < 0){
1277
perror_plus("asprintf");
1278
return 0;
1279
}
1280
1281
ret = stat(fullname, &st);
1282
if(ret == -1){
1283
if(debug){
1284
perror_plus("Could not stat hook");
1285
}
1286
return 0;
1287
}
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1290
if(debug){
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1292
direntry->d_name);
1293
}
1294
return 0;
1295
}
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1298
if(debug){
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1300
direntry->d_name);
1301
}
1302
return 0;
1303
}
1304
if(debug){
1305
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1306
direntry->d_name);
1307
}
1308
return 1;
1309
}
1310
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1312
int ret;
1313
struct timespec now;
1314
struct timespec waited_time;
1315
intmax_t block_time;
1316
1317
while(true){
1318
if(mc.current_server == NULL){
1319
if (debug){
1320
fprintf_plus(stderr, "Wait until first server is found."
1321
" No timeout!\n");
1322
}
1323
ret = avahi_simple_poll_iterate(s, -1);
1324
} else {
1325
if (debug){
1326
fprintf_plus(stderr, "Check current_server if we should run"
1327
" it, or wait\n");
1328
}
1329
/* the current time */
1330
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1331
if(ret == -1){
1332
perror_plus("clock_gettime");
1333
return -1;
1334
}
1335
/* Calculating in ms how long time between now and server
1336
who we visted longest time ago. Now - last seen. */
1337
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1339
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1341
/* total time is 10s/10,000ms.
1342
Converting to s from ms by dividing by 1,000,
1343
and ns to ms by dividing by 1,000,000. */
1344
block_time = ((retry_interval
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1347
1348
if (debug){
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1350
block_time);
1351
}
1352
1353
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1358
if(ret == 0){
1359
avahi_simple_poll_quit(mc.simple_poll);
1360
return 0;
1361
}
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1364
if(ret == -1){
1365
perror_plus("clock_gettime");
1366
return -1;
1367
}
1368
mc.current_server = mc.current_server->next;
1369
block_time = 0; /* Call avahi to find new Mandos
1370
servers, but don't block */
1371
}
1372
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1374
}
1375
if(ret != 0){
1376
if (ret > 0 or errno != EINTR){
1377
return (ret != 1) ? ret : 0;
1378
}
1379
}
1380
}
1381
}
1382
1383
bool run_network_hooks(const char *mode, const char *interface,
1384
const float delay){
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1387
int ret;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1389
alphasort);
1390
if(numhooks == -1){
1391
perror_plus("scandir");
1392
} else {
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1398
if(ret < 0){
1399
perror_plus("asprintf");
1400
continue;
1401
}
1402
if(debug){
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1404
direntry->d_name);
1405
}
1406
pid_t hook_pid = fork();
1407
if(hook_pid == 0){
1408
/* Child */
1409
dup2(devnull, STDIN_FILENO);
1410
close(devnull);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1413
if(ret == -1){
1414
perror_plus("setenv");
1415
return false;
1416
}
1417
ret = setenv("DEVICE", interface, 1);
1418
if(ret == -1){
1419
perror_plus("setenv");
1420
return false;
1421
}
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1423
if(ret == -1){
1424
perror_plus("setenv");
1425
return false;
1426
}
1427
ret = setenv("MODE", mode, 1);
1428
if(ret == -1){
1429
perror_plus("setenv");
1430
return false;
1431
}
1432
char *delaystring;
1433
ret = asprintf(&delaystring, "%f", delay);
1434
if(ret == -1){
1435
perror_plus("asprintf");
1436
return false;
1437
}
1438
ret = setenv("DELAY", delaystring, 1);
1439
if(ret == -1){
1440
free(delaystring);
1441
perror_plus("setenv");
1442
return false;
1443
}
1444
free(delaystring);
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1447
} else {
1448
int status;
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1451
free(fullname);
1452
continue;
1453
}
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1459
free(fullname);
1460
continue;
1461
}
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1465
WTERMSIG(status));
1466
free(fullname);
1467
continue;
1468
} else {
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1471
free(fullname);
1472
continue;
1473
}
1474
}
1475
free(fullname);
1476
if(debug){
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1478
direntry->d_name);
1479
}
1480
}
1481
close(devnull);
1482
}
1483
return true;
1484
}
1485
1486
873
int main(int argc, char *argv[]){
1487
874
AvahiSServiceBrowser *sb = NULL;
1488
875
int error;
1489
876
int ret;
1490
877
intmax_t tmpmax;
1491
char *tmp;
878
int numchars;
1492
879
int exitcode = EXIT_SUCCESS;
1493
const char *interface = "";
880
const char *interface = "eth0";
1494
881
struct ifreq network;
1495
int sd = -1;
1496
bool take_down_interface = false;
882
int sd;
1497
883
uid_t uid;
1498
884
gid_t gid;
885
char *connect_to = NULL;
1499
886
char tempdir[] = "/tmp/mandosXXXXXX";
1500
887
bool tempdir_created = false;
1501
888
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1502
889
const char *seckey = PATHDIR "/" SECKEY;
1503
890
const char *pubkey = PATHDIR "/" PUBKEY;
1504
891
892
mandos_context mc = { .simple_poll = NULL, .server = NULL,
893
.dh_bits = 1024, .priority = "SECURE256"
894
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1505
895
bool gnutls_initialized = false;
1506
896
bool gpgme_initialized = false;
1507
float delay = 2.5f;
1508
double retry_interval = 10; /* 10s between trying a server and
1509
retrying the same server again */
1510
1511
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1512
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1513
1514
uid = getuid();
1515
gid = getgid();
1516
1517
/* Lower any group privileges we might have, just to be safe */
1518
errno = 0;
1519
ret = setgid(gid);
1520
if(ret == -1){
1521
perror_plus("setgid");
1522
}
1523
1524
/* Lower user privileges (temporarily) */
1525
errno = 0;
1526
ret = seteuid(uid);
1527
if(ret == -1){
1528
perror_plus("seteuid");
1529
}
1530
1531
if(quit_now){
1532
goto end;
1533
}
897
double delay = 2.5;
1534
898
1535
899
{
1536
900
struct argp_option options[] = {
1566
930
.arg = "SECONDS",
1567
931
.doc = "Maximum delay to wait for interface startup",
1568
932
.group = 2 },
1569
{ .name = "retry", .key = 132,
1570
.arg = "SECONDS",
1571
.doc = "Retry interval used when denied by the mandos server",
1572
.group = 2 },
1573
{ .name = "network-hook-dir", .key = 133,
1574
.arg = "DIR",
1575
.doc = "Directory where network hooks are located",
1576
.group = 2 },
1577
/*
1578
* These reproduce what we would get without ARGP_NO_HELP
1579
*/
1580
{ .name = "help", .key = '?',
1581
.doc = "Give this help list", .group = -1 },
1582
{ .name = "usage", .key = -3,
1583
.doc = "Give a short usage message", .group = -1 },
1584
{ .name = "version", .key = 'V',
1585
.doc = "Print program version", .group = -1 },
1586
933
{ .name = NULL }
1587
934
};
1588
935
1589
936
error_t parse_opt(int key, char *arg,
1590
937
struct argp_state *state){
1591
errno = 0;
1592
938
switch(key){
1593
939
case 128: /* --debug */
1594
940
debug = true;
1606
952
pubkey = arg;
1607
953
break;
1608
954
case 129: /* --dh-bits */
1609
errno = 0;
1610
tmpmax = strtoimax(arg, &tmp, 10);
1611
if(errno != 0 or tmp == arg or *tmp != '\0'
1612
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1613
argp_error(state, "Bad number of DH bits");
955
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
956
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
957
or arg[numchars] != '\0'){
958
fprintf(stderr, "Bad number of DH bits\n");
959
exit(EXIT_FAILURE);
1614
960
}
1615
961
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1616
962
break;
1618
964
mc.priority = arg;
1619
965
break;
1620
966
case 131: /* --delay */
1621
errno = 0;
1622
delay = strtof(arg, &tmp);
1623
if(errno != 0 or tmp == arg or *tmp != '\0'){
1624
argp_error(state, "Bad delay");
1625
}
1626
case 132: /* --retry */
1627
errno = 0;
1628
retry_interval = strtod(arg, &tmp);
1629
if(errno != 0 or tmp == arg or *tmp != '\0'
1630
or (retry_interval * 1000) > INT_MAX
1631
or retry_interval < 0){
1632
argp_error(state, "Bad retry interval");
1633
}
1634
break;
1635
case 133: /* --network-hook-dir */
1636
hookdir = arg;
1637
break;
1638
/*
1639
* These reproduce what we would get without ARGP_NO_HELP
1640
*/
1641
case '?': /* --help */
1642
argp_state_help(state, state->out_stream,
1643
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1644
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1645
case -3: /* --usage */
1646
argp_state_help(state, state->out_stream,
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1652
exit(argp_err_exit_status);
967
ret = sscanf(arg, "%lf%n", &delay, &numchars);
968
if(ret < 1 or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad delay\n");
970
exit(EXIT_FAILURE);
971
}
972
break;
973
case ARGP_KEY_ARG:
974
argp_usage(state);
975
case ARGP_KEY_END:
1653
976
break;
1654
977
default:
1655
978
return ARGP_ERR_UNKNOWN;
1656
979
}
1657
return errno;
980
return 0;
1658
981
}
1659
982
1660
983
struct argp argp = { .options = options, .parser = parse_opt,
1661
984
.args_doc = "",
1662
985
.doc = "Mandos client -- Get and decrypt"
1663
986
" passwords from a Mandos server" };
1664
ret = argp_parse(&argp, argc, argv,
1665
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1666
switch(ret){
1667
case 0:
1668
break;
1669
case ENOMEM:
1670
default:
1671
errno = ret;
1672
perror_plus("argp_parse");
1673
exitcode = EX_OSERR;
1674
goto end;
1675
case EINVAL:
1676
exitcode = EX_USAGE;
1677
goto end;
1678
}
1679
}
1680
1681
if(getuid() == 0){
1682
/* Work around Debian bug #633582:
1683
<http://bugs.debian.org/633582> */
1684
struct stat st;
1685
1686
/* Re-raise priviliges */
1687
errno = 0;
1688
ret = seteuid(0);
1689
if(ret == -1){
1690
perror_plus("seteuid");
1691
}
1692
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1697
} else {
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1699
if(ret == -1){
1700
perror_plus("fstat");
1701
} else {
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1705
if(ret == -1){
1706
perror_plus("fchown");
1707
}
1708
}
1709
}
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1711
}
1712
}
1713
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1718
} else {
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1720
if(ret == -1){
1721
perror_plus("fstat");
1722
} else {
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1726
if(ret == -1){
1727
perror_plus("fchown");
1728
}
1729
}
1730
}
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1732
}
1733
}
1734
1735
/* Lower privileges */
1736
errno = 0;
1737
ret = seteuid(uid);
1738
if(ret == -1){
1739
perror_plus("seteuid");
1740
}
1741
}
1742
1743
/* Run network hooks */
1744
{
1745
if(getuid() == 0){
1746
/* Re-raise priviliges */
1747
errno = 0;
1748
ret = seteuid(0);
1749
if(ret == -1){
1750
perror_plus("seteuid");
1751
}
1752
}
1753
if(not run_network_hooks("start", interface, delay)){
1754
goto end;
1755
}
1756
if(getuid() == 0){
1757
/* Lower privileges */
1758
errno = 0;
1759
ret = seteuid(uid);
1760
if(ret == -1){
1761
perror_plus("seteuid");
1762
}
1763
}
1764
}
1765
1766
if(not debug){
1767
avahi_set_log_function(empty_log);
1768
}
1769
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1774
alphasort);
1775
if(ret == 0){
1776
/* No up interfaces, look for any good interfaces */
1777
free(direntries);
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1779
alphasort);
1780
}
1781
if(ret >= 1){
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1784
if(debug){
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1786
}
1787
if(interface == NULL){
1788
perror_plus("malloc");
1789
free(direntries);
1790
exitcode = EXIT_FAILURE;
1791
goto end;
1792
}
1793
free(direntries);
1794
} else {
1795
free(direntries);
1796
fprintf_plus(stderr, "Could not find a network interface\n");
987
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
988
if(ret == ARGP_ERR_UNKNOWN){
989
fprintf(stderr, "Unknown error while parsing arguments\n");
1797
990
exitcode = EXIT_FAILURE;
1798
991
goto end;
1799
992
}
1800
993
}
1801
994
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1803
from the signal handler */
1804
/* Initialize the pseudo-RNG for Avahi */
1805
srand((unsigned int) time(NULL));
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
1808
fprintf_plus(stderr,
1809
"Avahi: Failed to create simple poll object.\n");
1810
exitcode = EX_UNAVAILABLE;
1811
goto end;
1812
}
1813
1814
sigemptyset(&sigterm_action.sa_mask);
1815
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1816
if(ret == -1){
1817
perror_plus("sigaddset");
1818
exitcode = EX_OSERR;
1819
goto end;
1820
}
1821
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1822
if(ret == -1){
1823
perror_plus("sigaddset");
1824
exitcode = EX_OSERR;
1825
goto end;
1826
}
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1828
if(ret == -1){
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1831
goto end;
1832
}
1833
/* Need to check if the handler is SIG_IGN before handling:
1834
| [[info:libc:Initial Signal Actions]] |
1835
| [[info:libc:Basic Signal Handling]] |
1836
*/
1837
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1838
if(ret == -1){
1839
perror_plus("sigaction");
1840
return EX_OSERR;
1841
}
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
ret = sigaction(SIGINT, &sigterm_action, NULL);
1844
if(ret == -1){
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1847
goto end;
1848
}
1849
}
1850
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1851
if(ret == -1){
1852
perror_plus("sigaction");
1853
return EX_OSERR;
1854
}
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1857
if(ret == -1){
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1860
goto end;
1861
}
1862
}
1863
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1864
if(ret == -1){
1865
perror_plus("sigaction");
1866
return EX_OSERR;
1867
}
1868
if(old_sigterm_action.sa_handler != SIG_IGN){
1869
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1870
if(ret == -1){
1871
perror_plus("sigaction");
1872
exitcode = EX_OSERR;
1873
goto end;
1874
}
1875
}
1876
1877
995
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
1879
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1883
goto end;
1884
}
1885
1886
if(quit_now){
1887
goto end;
1888
}
1889
1890
/* Re-raise priviliges */
1891
errno = 0;
1892
ret = seteuid(0);
1893
if(ret == -1){
1894
perror_plus("seteuid");
1895
}
1896
996
if(interface[0] != '\0'){
1897
997
#ifdef __linux__
1898
998
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
999
messages to mess up the prompt */
1900
1000
ret = klogctl(8, NULL, 5);
1901
1001
bool restore_loglevel = true;
1902
1002
if(ret == -1){
1903
1003
restore_loglevel = false;
1904
perror_plus("klogctl");
1004
perror("klogctl");
1905
1005
}
1906
#endif /* __linux__ */
1006
#endif
1907
1007
1908
1008
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1909
1009
if(sd < 0){
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1010
perror("socket");
1011
exitcode = EXIT_FAILURE;
1912
1012
#ifdef __linux__
1913
1013
if(restore_loglevel){
1914
1014
ret = klogctl(7, NULL, 0);
1915
1015
if(ret == -1){
1916
perror_plus("klogctl");
1016
perror("klogctl");
1917
1017
}
1918
1018
}
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1921
errno = 0;
1922
ret = seteuid(uid);
1923
if(ret == -1){
1924
perror_plus("seteuid");
1925
}
1019
#endif
1926
1020
goto end;
1927
1021
}
1928
1022
strcpy(network.ifr_name, interface);
1929
1023
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1930
1024
if(ret == -1){
1931
perror_plus("ioctl SIOCGIFFLAGS");
1025
perror("ioctl SIOCGIFFLAGS");
1932
1026
#ifdef __linux__
1933
1027
if(restore_loglevel){
1934
1028
ret = klogctl(7, NULL, 0);
1935
1029
if(ret == -1){
1936
perror_plus("klogctl");
1030
perror("klogctl");
1937
1031
}
1938
1032
}
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1033
#endif
1034
exitcode = EXIT_FAILURE;
1947
1035
goto end;
1948
1036
}
1949
1037
if((network.ifr_flags & IFF_UP) == 0){
1950
1038
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
1039
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1953
1040
if(ret == -1){
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1041
perror("ioctl SIOCSIFFLAGS");
1042
exitcode = EXIT_FAILURE;
1957
1043
#ifdef __linux__
1958
1044
if(restore_loglevel){
1959
1045
ret = klogctl(7, NULL, 0);
1960
1046
if(ret == -1){
1961
perror_plus("klogctl");
1047
perror("klogctl");
1962
1048
}
1963
1049
}
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1966
errno = 0;
1967
ret = seteuid(uid);
1968
if(ret == -1){
1969
perror_plus("seteuid");
1970
}
1050
#endif
1971
1051
goto end;
1972
1052
}
1973
1053
}
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1054
/* sleep checking until interface is running */
1976
1055
for(int i=0; i < delay * 4; i++){
1977
1056
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1978
1057
if(ret == -1){
1979
perror_plus("ioctl SIOCGIFFLAGS");
1058
perror("ioctl SIOCGIFFLAGS");
1980
1059
} else if(network.ifr_flags & IFF_RUNNING){
1981
1060
break;
1982
1061
}
1983
1062
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
1063
ret = nanosleep(&sleeptime, NULL);
1985
1064
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1065
perror("nanosleep");
1987
1066
}
1988
1067
}
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
if(ret == -1){
1993
perror_plus("close");
1994
}
1068
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1069
if(ret == -1){
1070
perror("close");
1995
1071
}
1996
1072
#ifdef __linux__
1997
1073
if(restore_loglevel){
1998
1074
/* Restores kernel loglevel to default */
1999
1075
ret = klogctl(7, NULL, 0);
2000
1076
if(ret == -1){
2001
perror_plus("klogctl");
1077
perror("klogctl");
2002
1078
}
2003
1079
}
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2006
errno = 0;
2007
/* Lower privileges */
2008
ret = seteuid(uid);
2009
if(ret == -1){
2010
perror_plus("seteuid");
2011
}
2012
}
2013
2014
if(quit_now){
2015
goto end;
2016
}
2017
2018
ret = init_gnutls_global(pubkey, seckey);
2019
if(ret == -1){
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
exitcode = EX_UNAVAILABLE;
1080
#endif
1081
}
1082
1083
uid = getuid();
1084
gid = getgid();
1085
1086
errno = 0;
1087
setgid(gid);
1088
if(ret == -1){
1089
perror("setgid");
1090
}
1091
1092
ret = setuid(uid);
1093
if(ret == -1){
1094
perror("setuid");
1095
}
1096
1097
ret = init_gnutls_global(&mc, pubkey, seckey);
1098
if(ret == -1){
1099
fprintf(stderr, "init_gnutls_global failed\n");
1100
exitcode = EXIT_FAILURE;
2022
1101
goto end;
2023
1102
} else {
2024
1103
gnutls_initialized = true;
2025
1104
}
2026
1105
2027
if(quit_now){
2028
goto end;
2029
}
2030
2031
1106
if(mkdtemp(tempdir) == NULL){
2032
perror_plus("mkdtemp");
1107
perror("mkdtemp");
2033
1108
goto end;
2034
1109
}
2035
1110
tempdir_created = true;
2036
1111
2037
if(quit_now){
2038
goto end;
2039
}
2040
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2043
exitcode = EX_UNAVAILABLE;
1112
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1113
fprintf(stderr, "init_gpgme failed\n");
1114
exitcode = EXIT_FAILURE;
2044
1115
goto end;
2045
1116
} else {
2046
1117
gpgme_initialized = true;
2047
1118
}
2048
1119
2049
if(quit_now){
2050
goto end;
1120
if(interface[0] != '\0'){
1121
if_index = (AvahiIfIndex) if_nametoindex(interface);
1122
if(if_index == 0){
1123
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
2051
1127
}
2052
1128
2053
1129
if(connect_to != NULL){
2055
1131
/* (Mainly meant for debugging) */
2056
1132
char *address = strrchr(connect_to, ':');
2057
1133
if(address == NULL){
2058
fprintf_plus(stderr, "No colon in address\n");
2059
exitcode = EX_USAGE;
2060
goto end;
2061
}
2062
2063
if(quit_now){
2064
goto end;
2065
}
2066
1134
fprintf(stderr, "No colon in address\n");
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
2067
1138
uint16_t port;
2068
errno = 0;
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2071
or tmpmax != (uint16_t)tmpmax){
2072
fprintf_plus(stderr, "Bad port number\n");
2073
exitcode = EX_USAGE;
2074
goto end;
2075
}
2076
2077
if(quit_now){
2078
goto end;
2079
}
2080
1139
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1140
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1141
or address[numchars+1] != '\0'){
1142
fprintf(stderr, "Bad port number\n");
1143
exitcode = EXIT_FAILURE;
1144
goto end;
1145
}
2081
1146
port = (uint16_t)tmpmax;
2082
1147
*address = '\0';
1148
address = connect_to;
2083
1149
/* Colon in address indicates IPv6 */
2084
1150
int af;
2085
if(strchr(connect_to, ':') != NULL){
1151
if(strchr(address, ':') != NULL){
2086
1152
af = AF_INET6;
2087
/* Accept [] around IPv6 address - see RFC 5952 */
2088
if(connect_to[0] == '[' and address[-1] == ']')
2089
{
2090
connect_to++;
2091
address[-1] = '\0';
2092
}
2093
1153
} else {
2094
1154
af = AF_INET;
2095
1155
}
2096
address = connect_to;
2097
2098
if(quit_now){
2099
goto end;
2100
}
2101
2102
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2104
if(quit_now or ret == 0){
2105
break;
2106
}
2107
if(debug){
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
(int)retry_interval);
2110
}
2111
sleep((int)retry_interval);
2112
}
2113
2114
if (not quit_now){
1156
ret = start_mandos_communication(address, port, if_index, &mc,
1157
af);
1158
if(ret < 0){
1159
exitcode = EXIT_FAILURE;
1160
} else {
2115
1161
exitcode = EXIT_SUCCESS;
2116
1162
}
2117
2118
1163
goto end;
2119
1164
}
2120
1165
2121
if(quit_now){
1166
if(not debug){
1167
avahi_set_log_function(empty_log);
1168
}
1169
1170
/* Initialize the pseudo-RNG for Avahi */
1171
srand((unsigned int) time(NULL));
1172
1173
/* Allocate main Avahi loop object */
1174
mc.simple_poll = avahi_simple_poll_new();
1175
if(mc.simple_poll == NULL){
1176
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1177
exitcode = EXIT_FAILURE;
2122
1178
goto end;
2123
1179
}
2124
1180
2142
1198
2143
1199
/* Check if creating the Avahi server object succeeded */
2144
1200
if(mc.server == NULL){
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2147
exitcode = EX_UNAVAILABLE;
2148
goto end;
2149
}
2150
2151
if(quit_now){
1201
fprintf(stderr, "Failed to create Avahi server: %s\n",
1202
avahi_strerror(error));
1203
exitcode = EXIT_FAILURE;
2152
1204
goto end;
2153
1205
}
2154
1206
2155
1207
/* Create the Avahi service browser */
2156
1208
sb = avahi_s_service_browser_new(mc.server, if_index,
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2158
NULL, 0, browse_callback, NULL);
1209
AVAHI_PROTO_INET6, "_mandos._tcp",
1210
NULL, 0, browse_callback, &mc);
2159
1211
if(sb == NULL){
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
avahi_strerror(avahi_server_errno(mc.server)));
2162
exitcode = EX_UNAVAILABLE;
2163
goto end;
2164
}
2165
2166
if(quit_now){
1212
fprintf(stderr, "Failed to create service browser: %s\n",
1213
avahi_strerror(avahi_server_errno(mc.server)));
1214
exitcode = EXIT_FAILURE;
2167
1215
goto end;
2168
1216
}
2169
1217
2170
1218
/* Run the main loop */
2171
1219
2172
1220
if(debug){
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2174
}
2175
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2178
if(debug){
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
(ret == 0) ? "successfully" : "with error");
2181
}
1221
fprintf(stderr, "Starting Avahi loop search\n");
1222
}
1223
1224
avahi_simple_poll_loop(mc.simple_poll);
2182
1225
2183
1226
end:
2184
1227
2185
1228
if(debug){
2186
fprintf_plus(stderr, "%s exiting\n", argv[0]);
1229
fprintf(stderr, "%s exiting\n", argv[0]);
2187
1230
}
2188
1231
2189
1232
/* Cleanup things */
2206
1249
gpgme_release(mc.ctx);
2207
1250
}
2208
1251
2209
/* Cleans up the circular linked list of Mandos servers the client
2210
has seen */
2211
if(mc.current_server != NULL){
2212
mc.current_server->prev->next = NULL;
2213
while(mc.current_server != NULL){
2214
server *next = mc.current_server->next;
2215
free(mc.current_server);
2216
mc.current_server = next;
2217
}
2218
}
2219
2220
/* Re-raise priviliges */
2221
{
2222
if(getuid() == 0){
2223
errno = 0;
2224
ret = seteuid(0);
2225
if(ret == -1){
2226
perror_plus("seteuid");
2227
}
2228
}
2229
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2232
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2236
if(ret == -1){
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2241
if(ret == -1){
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2243
}
2244
}
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2246
if(ret == -1){
2247
perror_plus("close");
2248
}
2249
}
2250
}
2251
if(getuid() == 0){
2252
/* Lower privileges permanently */
2253
errno = 0;
2254
ret = setuid(uid);
2255
if(ret == -1){
2256
perror_plus("setuid");
2257
}
2258
}
2259
2260
/* Removes the GPGME temp directory and all files inside */
1252
/* Removes the temp directory used by GPGME */
2261
1253
if(tempdir_created){
2262
struct dirent **direntries = NULL;
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2265
alphasort);
2266
if (numentries > 0){
2267
for(int i = 0; i < numentries; i++){
2268
direntry = direntries[i];
1254
DIR *d;
1255
struct dirent *direntry;
1256
d = opendir(tempdir);
1257
if(d == NULL){
1258
if(errno != ENOENT){
1259
perror("opendir");
1260
}
1261
} else {
1262
while(true){
1263
direntry = readdir(d);
1264
if(direntry == NULL){
1265
break;
1266
}
1267
/* Skip "." and ".." */
1268
if(direntry->d_name[0] == '.'
1269
and (direntry->d_name[1] == '\0'
1270
or (direntry->d_name[1] == '.'
1271
and direntry->d_name[2] == '\0'))){
1272
continue;
1273
}
2269
1274
char *fullname = NULL;
2270
1275
ret = asprintf(&fullname, "%s/%s", tempdir,
2271
1276
direntry->d_name);
2272
1277
if(ret < 0){
2273
perror_plus("asprintf");
1278
perror("asprintf");
2274
1279
continue;
2275
1280
}
2276
1281
ret = remove(fullname);
2277
1282
if(ret == -1){
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2279
strerror(errno));
1283
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1284
strerror(errno));
2280
1285
}
2281
1286
free(fullname);
2282
1287
}
2283
}
2284
2285
/* need to clean even if 0 because man page doesn't specify */
2286
free(direntries);
2287
if (numentries == -1){
2288
perror_plus("scandir");
1288
closedir(d);
2289
1289
}
2290
1290
ret = rmdir(tempdir);
2291
1291
if(ret == -1 and errno != ENOENT){
2292
perror_plus("rmdir");
2293
}
2294
}
2295
2296
if(quit_now){
2297
sigemptyset(&old_sigterm_action.sa_mask);
2298
old_sigterm_action.sa_handler = SIG_DFL;
2299
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2300
&old_sigterm_action,
2301
NULL));
2302
if(ret == -1){
2303
perror_plus("sigaction");
2304
}
2305
do {
2306
ret = raise(signal_received);
2307
} while(ret != 0 and errno == EINTR);
2308
if(ret != 0){
2309
perror_plus("raise");
2310
abort();
2311
}
2312
TEMP_FAILURE_RETRY(pause());
1292
perror("rmdir");
1293
}
2313
1294
}
2314
1295
2315
1296
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0