9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2018 Teddy Hogeborn
13
* Copyright © 2008-2018 Björn Påhlsson
15
* This file is part of Mandos.
17
* Mandos is free software: you can redistribute it and/or modify it
18
* under the terms of the GNU General Public License as published by
19
* the Free Software Foundation, either version 3 of the License, or
20
* (at your option) any later version.
22
* Mandos is distributed in the hope that it will be useful, but
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
* This program is free software: you can redistribute it and/or
15
* modify it under the terms of the GNU General Public License as
16
* published by the Free Software Foundation, either version 3 of the
17
* License, or (at your option) any later version.
19
* This program is distributed in the hope that it will be useful, but
23
20
* WITHOUT ANY WARRANTY; without even the implied warranty of
24
21
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25
22
* General Public License for more details.
27
24
* You should have received a copy of the GNU General Public License
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
30
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
33
31
/* Needed by GPGME, specifically gpgme_data_seek() */
34
#ifndef _LARGEFILE_SOURCE
35
32
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
#ifndef _FILE_OFFSET_BITS
38
33
#define _FILE_OFFSET_BITS 64
39
#endif /* not _FILE_OFFSET_BITS */
41
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
43
#include <stdio.h> /* fprintf(), stderr, fwrite(),
45
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout, ferror() */
38
#include <stdint.h> /* uint16_t, uint32_t */
46
39
#include <stddef.h> /* NULL, size_t, ssize_t */
47
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
49
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strcmp(), strlen(), strerror(),
51
asprintf(), strncpy(), strsignal()
53
#include <sys/ioctl.h> /* ioctl */
40
#include <stdlib.h> /* free() */
41
#include <stdbool.h> /* bool, true */
42
#include <string.h> /* memset(), strcmp(), strlen, strerror() */
43
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
54
45
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
55
sockaddr_in6, PF_INET6,
56
SOCK_STREAM, uid_t, gid_t, open(),
58
#include <sys/stat.h> /* open(), S_ISREG */
46
sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */
59
47
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
60
inet_pton(), connect(),
62
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
63
#include <dirent.h> /* opendir(), struct dirent, readdir()
65
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
67
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
68
EAI_SYSTEM, ENETUNREACH,
69
EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
72
program_invocation_short_name */
73
#include <time.h> /* nanosleep(), time(), sleep() */
48
struct in6_addr, inet_pton(),
51
#include <errno.h> /* perror() */
74
53
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
54
SIOCSIFFLAGS, if_indextoname(),
76
55
if_nametoindex(), IF_NAMESIZE */
77
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
78
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
80
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
81
getuid(), getgid(), seteuid(),
82
setgid(), pause(), _exit(),
84
#include <arpa/inet.h> /* inet_pton(), htons() */
85
#include <iso646.h> /* not, or, and */
86
#include <argp.h> /* struct argp_option, error_t, struct
87
argp_state, struct argp,
88
argp_parse(), ARGP_KEY_ARG,
89
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
#include <signal.h> /* sigemptyset(), sigaddset(),
91
sigaction(), SIGTERM, sig_atomic_t,
93
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
94
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
95
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
96
WEXITSTATUS(), WTERMSIG() */
97
#include <grp.h> /* setgroups() */
98
#include <argz.h> /* argz_add_sep(), argz_next(),
99
argz_delete(), argz_append(),
100
argz_stringify(), argz_add(),
102
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
103
EAI_SYSTEM, gai_strerror() */
106
#include <sys/klog.h> /* klogctl() */
107
#endif /* __linux__ */
56
#include <unistd.h> /* close(), SEEK_SET, off_t, write()*/
57
#include <netinet/in.h>
58
#include <arpa/inet.h> /* inet_pton(), htons */
59
#include <iso646.h> /* not */
60
#include <argp.h> /* struct argp_option,
61
struct argp_state, struct argp,
110
/* All Avahi types, constants and functions
113
#include <avahi-core/core.h>
65
#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,
114
67
#include <avahi-core/lookup.h>
115
#include <avahi-core/log.h>
68
#include <avahi-core/log.h> /* AvahiLogLevel */
116
69
#include <avahi-common/simple-watch.h>
117
70
#include <avahi-common/malloc.h>
118
71
#include <avahi-common/error.h>
121
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
74
#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,
78
gnutls_global_set_log_level(),
79
gnutls_global_set_log_function(),
80
gnutls_certificate_allocate_credentials(),
81
gnutls_global_deinit(),
82
gnutls_dh_params_init(),
83
gnutls_dh_params_generate(),
84
gnutls_certificate_set_dh_params(),
85
gnutls_certificate_free_credentials(),
86
gnutls_session_t, gnutls_init(),
87
gnutls_priority_set_direct(),
89
gnutls_credentials_set(),
90
gnutls_certificate_server_set_request(),
91
gnutls_dh_set_prime_bits(),
92
gnutls_transport_set_ptr(),
93
gnutls_transport_ptr_t,
96
gnutls_perror(), gnutls_bye(),
124
97
init_gnutls_session(),
126
#include <gnutls/openpgp.h>
127
/* gnutls_certificate_set_openpgp_key_file(),
128
GNUTLS_OPENPGP_FMT_BASE64 */
99
GNUTLS_CRD_CERTIFICATE,
101
GNUTLS_E_INTERRUPTED,
103
GNUTLS_E_REHANDSHAKE,
105
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
106
GNUTLS_OPENPGP_FMT_BASE64 */
131
#include <gpgme.h> /* All GPGME types, constants and
109
#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,
110
gpgme_error_t, gpgme_engine_info_t,
111
gpgme_check_version(),
112
gpgme_engine_check_version(),
115
gpgme_get_engine_info(),
116
gpgme_set_engine_info(),
117
gpgme_data_new_from_mem(),
118
gpgme_data_new(), gpgme_new(),
120
gpgme_decrypt_result_t,
121
gpgme_op_decrypt_result(),
123
gpgme_pubkey_algo_name(),
134
127
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_SECKEY, */
137
131
#define BUFFER_SIZE 256
139
#define PATHDIR "/conf/conf.d/mandos"
140
#define SECKEY "seckey.txt"
141
#define PUBKEY "pubkey.txt"
142
#define HOOKDIR "/lib/mandos/network-hooks.d"
144
133
bool debug = false;
134
static const char *keydir = "/conf/conf.d/mandos";
145
135
static const char mandos_protocol_version[] = "1";
146
const char *argp_program_version = "mandos-client " VERSION;
147
const char *argp_program_bug_address = "<mandos@recompile.se>";
148
static const char sys_class_net[] = "/sys/class/net";
149
char *connect_to = NULL;
150
const char *hookdir = HOOKDIR;
155
/* Doubly linked list that need to be circularly linked when used */
156
typedef struct server{
159
AvahiIfIndex if_index;
161
struct timespec last_seen;
136
const char *argp_program_version = "mandosclient 0.9";
137
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
166
139
/* Used for passing in values through the Avahi callback functions */
141
AvahiSimplePoll *simple_poll;
168
142
AvahiServer *server;
169
143
gnutls_certificate_credentials_t cred;
170
144
unsigned int dh_bits;
171
145
gnutls_dh_params_t dh_params;
172
146
const char *priority;
174
server *current_server;
176
size_t interfaces_size;
177
147
} mandos_context;
179
/* global so signal handler can reach it*/
180
AvahiSimplePoll *simple_poll;
182
sig_atomic_t quit_now = 0;
183
int signal_received = 0;
185
/* Function to use when printing errors */
186
void perror_plus(const char *print_text){
188
fprintf(stderr, "Mandos plugin %s: ",
189
program_invocation_short_name);
194
__attribute__((format (gnu_printf, 2, 3), nonnull))
195
int fprintf_plus(FILE *stream, const char *format, ...){
197
va_start (ap, format);
199
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
200
program_invocation_short_name));
201
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
205
* Make additional room in "buffer" for at least BUFFER_SIZE more
206
* bytes. "buffer_capacity" is how much is currently allocated,
150
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
151
* "buffer_capacity" is how much is currently allocated,
207
152
* "buffer_length" is how much is already used.
209
__attribute__((nonnull, warn_unused_result))
210
size_t incbuffer(char **buffer, size_t buffer_length,
211
size_t buffer_capacity){
212
if(buffer_length + BUFFER_SIZE > buffer_capacity){
213
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
215
int old_errno = errno;
154
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t buffer_capacity){
156
if (buffer_length + BUFFER_SIZE > buffer_capacity){
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
222
161
buffer_capacity += BUFFER_SIZE;
224
163
return buffer_capacity;
227
/* Add server to set of servers to retry periodically */
228
__attribute__((nonnull, warn_unused_result))
229
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
230
int af, server **current_server){
232
server *new_server = malloc(sizeof(server));
233
if(new_server == NULL){
234
perror_plus("malloc");
237
*new_server = (server){ .ip = strdup(ip),
239
.if_index = if_index,
241
if(new_server->ip == NULL){
242
perror_plus("strdup");
246
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
248
perror_plus("clock_gettime");
250
#pragma GCC diagnostic push
251
#pragma GCC diagnostic ignored "-Wcast-qual"
253
free((char *)(new_server->ip));
255
#pragma GCC diagnostic pop
260
/* Special case of first server */
261
if(*current_server == NULL){
262
new_server->next = new_server;
263
new_server->prev = new_server;
264
*current_server = new_server;
266
/* Place the new server last in the list */
267
new_server->next = *current_server;
268
new_server->prev = (*current_server)->prev;
269
new_server->prev->next = new_server;
270
(*current_server)->prev = new_server;
167
* Decrypt OpenPGP data using keyrings in HOMEDIR.
168
* Returns -1 on error
278
__attribute__((nonnull, warn_unused_result))
279
static bool init_gpgme(const char * const seckey,
280
const char * const pubkey,
281
const char * const tempdir,
170
static ssize_t pgp_packet_decrypt (const char *cryptotext,
173
const char *homedir){
174
gpgme_data_t dh_crypto, dh_plain;
283
176
gpgme_error_t rc;
178
size_t plaintext_capacity = 0;
179
ssize_t plaintext_length = 0;
284
180
gpgme_engine_info_t engine_info;
287
* Helper function to insert pub and seckey to the engine keyring.
289
bool import_key(const char * const filename){
292
gpgme_data_t pgp_data;
294
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
300
rc = gpgme_data_new_from_fd(&pgp_data, fd);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
307
rc = gpgme_op_import(mc->ctx, pgp_data);
308
if(rc != GPG_ERR_NO_ERROR){
309
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
310
gpgme_strsource(rc), gpgme_strerror(rc));
316
perror_plus("close");
318
gpgme_data_release(pgp_data);
323
fprintf_plus(stderr, "Initializing GPGME\n");
183
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
327
187
gpgme_check_version(NULL);
328
188
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
329
if(rc != GPG_ERR_NO_ERROR){
330
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
331
gpgme_strsource(rc), gpgme_strerror(rc));
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
335
195
/* Set GPGME home directory for the OpenPGP engine only */
336
rc = gpgme_get_engine_info(&engine_info);
337
if(rc != GPG_ERR_NO_ERROR){
338
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
339
gpgme_strsource(rc), gpgme_strerror(rc));
196
rc = gpgme_get_engine_info (&engine_info);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
342
202
while(engine_info != NULL){
343
203
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
344
204
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
345
engine_info->file_name, tempdir);
205
engine_info->file_name, homedir);
348
208
engine_info = engine_info->next;
350
210
if(engine_info == NULL){
351
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
356
/* Create new GPGME "context" */
357
rc = gpgme_new(&(mc->ctx));
358
if(rc != GPG_ERR_NO_ERROR){
359
fprintf_plus(stderr, "Mandos plugin mandos-client: "
360
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
365
if(not import_key(pubkey) or not import_key(seckey)){
373
* Decrypt OpenPGP data.
374
* Returns -1 on error
376
__attribute__((nonnull, warn_unused_result))
377
static ssize_t pgp_packet_decrypt(const char *cryptotext,
381
gpgme_data_t dh_crypto, dh_plain;
384
size_t plaintext_capacity = 0;
385
ssize_t plaintext_length = 0;
388
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
211
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
391
215
/* Create new GPGME data buffer from memory cryptotext */
392
216
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
394
if(rc != GPG_ERR_NO_ERROR){
395
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
396
gpgme_strsource(rc), gpgme_strerror(rc));
218
if (rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
400
224
/* Create new empty GPGME data buffer for the plaintext */
401
225
rc = gpgme_data_new(&dh_plain);
402
if(rc != GPG_ERR_NO_ERROR){
403
fprintf_plus(stderr, "Mandos plugin mandos-client: "
404
"bad gpgme_data_new: %s: %s\n",
405
gpgme_strsource(rc), gpgme_strerror(rc));
226
if (rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
406
229
gpgme_data_release(dh_crypto);
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&ctx);
235
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
plaintext_length = -1;
410
242
/* Decrypt data from the cryptotext data buffer to the plaintext
412
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
413
if(rc != GPG_ERR_NO_ERROR){
414
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
415
gpgme_strsource(rc), gpgme_strerror(rc));
244
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
245
if (rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
416
248
plaintext_length = -1;
418
gpgme_decrypt_result_t result;
419
result = gpgme_op_decrypt_result(mc->ctx);
421
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
423
if(result->unsupported_algorithm != NULL) {
424
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
425
result->unsupported_algorithm);
427
fprintf_plus(stderr, "Wrong key usage: %s\n",
428
result->wrong_key_usage ? "Yes" : "No");
429
if(result->file_name != NULL){
430
fprintf_plus(stderr, "File name: %s\n", result->file_name);
432
gpgme_recipient_t recipient;
433
recipient = result->recipients;
253
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
257
gpgme_decrypt_result_t result;
258
result = gpgme_op_decrypt_result(ctx);
260
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
262
fprintf(stderr, "Unsupported algorithm: %s\n",
263
result->unsupported_algorithm);
264
fprintf(stderr, "Wrong key usage: %d\n",
265
result->wrong_key_usage);
266
if(result->file_name != NULL){
267
fprintf(stderr, "File name: %s\n", result->file_name);
269
gpgme_recipient_t recipient;
270
recipient = result->recipients;
434
272
while(recipient != NULL){
435
fprintf_plus(stderr, "Public key algorithm: %s\n",
436
gpgme_pubkey_algo_name
437
(recipient->pubkey_algo));
438
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
439
fprintf_plus(stderr, "Secret key available: %s\n",
440
recipient->status == GPG_ERR_NO_SECKEY
273
fprintf(stderr, "Public key algorithm: %s\n",
274
gpgme_pubkey_algo_name(recipient->pubkey_algo));
275
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
276
fprintf(stderr, "Secret key available: %s\n",
277
recipient->status == GPG_ERR_NO_SECKEY
442
279
recipient = recipient->next;
450
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
453
285
/* Seek back to the beginning of the GPGME plaintext data buffer */
454
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
455
perror_plus("gpgme_data_seek");
286
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
287
perror("pgpme_data_seek");
456
288
plaintext_length = -1;
457
289
goto decrypt_end;
460
292
*plaintext = NULL;
462
plaintext_capacity = incbuffer(plaintext,
463
(size_t)plaintext_length,
465
if(plaintext_capacity == 0){
466
perror_plus("incbuffer");
467
plaintext_length = -1;
294
plaintext_capacity = adjustbuffer(plaintext,
295
(size_t)plaintext_length,
297
if (plaintext_capacity == 0){
298
perror("adjustbuffer");
299
plaintext_length = -1;
471
303
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
473
305
/* Print the data, if any */
479
perror_plus("gpgme_data_read");
311
perror("gpgme_data_read");
480
312
plaintext_length = -1;
481
313
goto decrypt_end;
483
315
plaintext_length += ret;
487
fprintf_plus(stderr, "Decrypted password is: ");
319
fprintf(stderr, "Decrypted password is: ");
488
320
for(ssize_t i = 0; i < plaintext_length; i++){
489
321
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
544
373
/* OpenPGP credentials */
545
ret = gnutls_certificate_allocate_credentials(&mc->cred);
546
if(ret != GNUTLS_E_SUCCESS){
547
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
548
safer_gnutls_strerror(ret));
374
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
375
!= GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "GnuTLS memory error: %s\n",
377
safer_gnutls_strerror(ret));
378
gnutls_global_deinit ();
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
383
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
384
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
559
388
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
561
GNUTLS_OPENPGP_FMT_BASE64);
562
if(ret != GNUTLS_E_SUCCESS){
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
389
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
390
if (ret != GNUTLS_E_SUCCESS) {
392
"Error[%d] while reading the OpenPGP key pair ('%s',"
393
" '%s')\n", ret, pubkeyfile, seckeyfile);
394
fprintf(stdout, "The GnuTLS error is: %s\n",
395
safer_gnutls_strerror(ret));
571
399
/* GnuTLS server initialization */
572
400
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
586
dhparamsfilename = NULL;
589
size_t params_capacity = 0;
591
params_capacity = incbuffer((char **)¶ms.data,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
598
dhparamsfilename = NULL;
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
608
/* check bytes_read for failure */
613
dhparamsfilename = NULL;
616
params.size += (unsigned int)bytes_read;
618
ret = close(dhpfile);
620
perror_plus("close");
622
if(params.data == NULL){
623
dhparamsfilename = NULL;
625
if(dhparamsfilename == NULL){
628
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
629
GNUTLS_X509_FMT_PEM);
630
if(ret != GNUTLS_E_SUCCESS){
631
fprintf_plus(stderr, "Failed to parse DH parameters in file"
632
" \"%s\": %s\n", dhparamsfilename,
633
safer_gnutls_strerror(ret));
634
dhparamsfilename = NULL;
639
if(dhparamsfilename == NULL){
640
if(mc->dh_bits == 0){
641
/* Find out the optimal number of DH bits */
642
/* Try to read the private key file */
643
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
645
int secfile = open(seckeyfilename, O_RDONLY);
650
size_t buffer_capacity = 0;
652
buffer_capacity = incbuffer((char **)&buffer.data,
654
(size_t)buffer_capacity);
655
if(buffer_capacity == 0){
656
perror_plus("incbuffer");
661
ssize_t bytes_read = read(secfile,
662
buffer.data + buffer.size,
668
/* check bytes_read for failure */
675
buffer.size += (unsigned int)bytes_read;
679
/* If successful, use buffer to parse private key */
680
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
681
if(buffer.data != NULL){
683
gnutls_openpgp_privkey_t privkey = NULL;
684
ret = gnutls_openpgp_privkey_init(&privkey);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error initializing OpenPGP key"
688
safer_gnutls_strerror(ret));
692
ret = gnutls_openpgp_privkey_import
693
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
694
if(ret != GNUTLS_E_SUCCESS){
695
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
696
safer_gnutls_strerror(ret));
702
/* Use private key to suggest an appropriate
704
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
705
gnutls_openpgp_privkey_deinit(privkey);
707
fprintf_plus(stderr, "This OpenPGP key implies using"
708
" a GnuTLS security parameter \"%s\".\n",
709
safe_string(gnutls_sec_param_get_name
715
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
716
/* Err on the side of caution */
717
sec_param = GNUTLS_SEC_PARAM_ULTRA;
719
fprintf_plus(stderr, "Falling back to security parameter"
721
safe_string(gnutls_sec_param_get_name
726
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
730
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
731
" implies %u DH bits; using that.\n",
732
safe_string(gnutls_sec_param_get_name
737
fprintf_plus(stderr, "Failed to get implied number of DH"
738
" bits for security parameter \"%s\"): %s\n",
739
safe_string(gnutls_sec_param_get_name
741
safer_gnutls_strerror(ret));
745
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
748
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
749
if(ret != GNUTLS_E_SUCCESS){
750
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
751
" bits): %s\n", mc->dh_bits,
752
safer_gnutls_strerror(ret));
401
if (ret != GNUTLS_E_SUCCESS) {
402
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
403
" %s\n", safer_gnutls_strerror(ret));
406
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
409
safer_gnutls_strerror(ret));
756
413
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
762
419
gnutls_certificate_free_credentials(mc->cred);
763
gnutls_dh_params_deinit(mc->dh_params);
420
gnutls_global_deinit();
767
__attribute__((nonnull, warn_unused_result))
768
static int init_gnutls_session(gnutls_session_t *session,
425
static int init_gnutls_session(mandos_context *mc,
426
gnutls_session_t *session){
771
428
/* GnuTLS session creation */
773
ret = gnutls_init(session, GNUTLS_SERVER);
777
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
778
if(ret != GNUTLS_E_SUCCESS){
780
"Error in GnuTLS session initialization: %s\n",
781
safer_gnutls_strerror(ret));
429
ret = gnutls_init(session, GNUTLS_SERVER);
430
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
432
safer_gnutls_strerror(ret));
787
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
789
gnutls_deinit(*session);
792
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
793
if(ret != GNUTLS_E_SUCCESS){
794
fprintf_plus(stderr, "Syntax error at: %s\n", err);
795
fprintf_plus(stderr, "GnuTLS error: %s\n",
796
safer_gnutls_strerror(ret));
797
gnutls_deinit(*session);
437
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
438
if (ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Syntax error at: %s\n", err);
440
fprintf(stderr, "GnuTLS error: %s\n",
441
safer_gnutls_strerror(ret));
442
gnutls_deinit (*session);
803
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
806
gnutls_deinit(*session);
809
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
810
if(ret != GNUTLS_E_SUCCESS){
811
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
812
safer_gnutls_strerror(ret));
813
gnutls_deinit(*session);
447
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
449
if (ret != GNUTLS_E_SUCCESS) {
450
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
451
safer_gnutls_strerror(ret));
452
gnutls_deinit (*session);
817
456
/* ignore client certificate if any. */
818
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
457
gnutls_certificate_server_set_request (*session,
460
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
824
466
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
825
467
__attribute__((unused)) const char *txt){}
827
/* Set effective uid to 0, return errno */
828
__attribute__((warn_unused_result))
829
int raise_privileges(void){
830
int old_errno = errno;
832
if(seteuid(0) == -1){
839
/* Set effective and real user ID to 0. Return errno. */
840
__attribute__((warn_unused_result))
841
int raise_privileges_permanently(void){
842
int old_errno = errno;
843
int ret = raise_privileges();
855
/* Set effective user ID to unprivileged saved user ID */
856
__attribute__((warn_unused_result))
857
int lower_privileges(void){
858
int old_errno = errno;
860
if(seteuid(uid) == -1){
867
/* Lower privileges permanently */
868
__attribute__((warn_unused_result))
869
int lower_privileges_permanently(void){
870
int old_errno = errno;
872
if(setuid(uid) == -1){
879
/* Helper function to add_local_route() and delete_local_route() */
880
__attribute__((nonnull, warn_unused_result))
881
static bool add_delete_local_route(const bool add,
883
AvahiIfIndex if_index){
885
char helper[] = "mandos-client-iprouteadddel";
886
char add_arg[] = "add";
887
char delete_arg[] = "delete";
888
char debug_flag[] = "--debug";
889
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
890
if(pluginhelperdir == NULL){
892
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
893
" variable not set; cannot run helper\n");
898
char interface[IF_NAMESIZE];
899
if(if_indextoname((unsigned int)if_index, interface) == NULL){
900
perror_plus("if_indextoname");
904
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
906
perror_plus("open(\"/dev/null\", O_RDONLY)");
912
/* Raise privileges */
913
errno = raise_privileges_permanently();
915
perror_plus("Failed to raise privileges");
916
/* _exit(EX_NOPERM); */
922
perror_plus("setgid");
925
/* Reset supplementary groups */
927
ret = setgroups(0, NULL);
929
perror_plus("setgroups");
933
ret = dup2(devnull, STDIN_FILENO);
935
perror_plus("dup2(devnull, STDIN_FILENO)");
938
ret = close(devnull);
940
perror_plus("close");
943
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
945
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
948
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
953
if(helperdir_fd == -1){
955
_exit(EX_UNAVAILABLE);
957
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
960
perror_plus("openat");
962
_exit(EX_UNAVAILABLE);
966
#pragma GCC diagnostic push
967
#pragma GCC diagnostic ignored "-Wcast-qual"
969
if(fexecve(helper_fd, (char *const [])
970
{ helper, add ? add_arg : delete_arg, (char *)address,
971
interface, debug ? debug_flag : NULL, NULL },
974
#pragma GCC diagnostic pop
976
perror_plus("fexecve");
988
pret = waitpid(pid, &status, 0);
989
if(pret == -1 and errno == EINTR and quit_now){
990
int errno_raising = 0;
991
if((errno = raise_privileges()) != 0){
992
errno_raising = errno;
993
perror_plus("Failed to raise privileges in order to"
994
" kill helper program");
996
if(kill(pid, SIGTERM) == -1){
999
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1000
perror_plus("Failed to lower privileges after killing"
1005
} while(pret == -1 and errno == EINTR);
1007
perror_plus("waitpid");
1010
if(WIFEXITED(status)){
1011
if(WEXITSTATUS(status) != 0){
1012
fprintf_plus(stderr, "Error: iprouteadddel exited"
1013
" with status %d\n", WEXITSTATUS(status));
1018
if(WIFSIGNALED(status)){
1019
fprintf_plus(stderr, "Error: iprouteadddel died by"
1020
" signal %d\n", WTERMSIG(status));
1023
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool add_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Adding route to %s\n", address);
1033
return add_delete_local_route(true, address, if_index);
1036
__attribute__((nonnull, warn_unused_result))
1037
static bool delete_local_route(const char *address,
1038
AvahiIfIndex if_index){
1040
fprintf_plus(stderr, "Removing route to %s\n", address);
1042
return add_delete_local_route(false, address, if_index);
1045
469
/* Called when a Mandos server is found */
1046
__attribute__((nonnull, warn_unused_result))
1047
static int start_mandos_communication(const char *ip, in_port_t port,
470
static int start_mandos_communication(const char *ip, uint16_t port,
1048
471
AvahiIfIndex if_index,
1049
int af, mandos_context *mc){
1050
int ret, tcp_sd = -1;
1052
struct sockaddr_storage to;
474
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1053
475
char *buffer = NULL;
1054
char *decrypted_buffer = NULL;
476
char *decrypted_buffer;
1055
477
size_t buffer_length = 0;
1056
478
size_t buffer_capacity = 0;
479
ssize_t decrypted_buffer_size;
482
char interface[IF_NAMESIZE];
1059
483
gnutls_session_t session;
1060
int pf; /* Protocol family */
1061
bool route_added = false;
1078
fprintf_plus(stderr, "Bad address family: %d\n", af);
1083
/* If the interface is specified and we have a list of interfaces */
1084
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1085
/* Check if the interface is one of the interfaces we are using */
1088
char *interface = NULL;
1089
while((interface = argz_next(mc->interfaces,
1090
mc->interfaces_size,
1092
if(if_nametoindex(interface) == (unsigned int)if_index){
1099
/* This interface does not match any in the list, so we don't
1100
connect to the server */
1102
char interface[IF_NAMESIZE];
1103
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1104
perror_plus("if_indextoname");
1106
fprintf_plus(stderr, "Skipping server on non-used interface"
1108
if_indextoname((unsigned int)if_index,
485
ret = init_gnutls_session (mc, &session);
491
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
495
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
502
if(if_indextoname((unsigned int)if_index, interface) == NULL){
503
perror("if_indextoname");
506
fprintf(stderr, "Binding to interface %s\n", interface);
1116
ret = init_gnutls_session(&session, mc);
509
memset(&to,0,sizeof(to)); /* Spurious warning */
510
to.in6.sin6_family = AF_INET6;
511
/* It would be nice to have a way to detect if we were passed an
512
IPv4 address here. Now we assume an IPv6 address. */
513
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1122
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1123
PRIuMAX "\n", ip, (uintmax_t)port);
1126
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1129
perror_plus("socket");
1140
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1141
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1142
ret = inet_pton(af, ip, &to6->sin6_addr);
1144
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1145
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1146
ret = inet_pton(af, ip, &to4->sin_addr);
1150
perror_plus("inet_pton");
1156
fprintf_plus(stderr, "Bad address: %s\n", ip);
1161
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1162
if(IN6_IS_ADDR_LINKLOCAL
1163
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1164
if(if_index == AVAHI_IF_UNSPEC){
1165
fprintf_plus(stderr, "An IPv6 link-local address is"
1166
" incomplete without a network interface\n");
1170
/* Set the network interface number as scope */
1171
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1174
((struct sockaddr_in *)&to)->sin_port = htons(port);
519
fprintf(stderr, "Bad address: %s\n", ip);
522
to.in6.sin6_port = htons(port); /* Spurious warning */
524
to.in6.sin6_scope_id = (uint32_t)if_index;
1183
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1184
char interface[IF_NAMESIZE];
1185
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1186
perror_plus("if_indextoname");
1188
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1189
"\n", ip, interface, (uintmax_t)port);
1192
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1193
ip, (uintmax_t)port);
1195
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1196
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in6),
1200
addrstr, sizeof(addrstr), NULL, 0,
1203
ret = getnameinfo((struct sockaddr *)&to,
1204
sizeof(struct sockaddr_in),
1205
addrstr, sizeof(addrstr), NULL, 0,
1208
if(ret == EAI_SYSTEM){
1209
perror_plus("getnameinfo");
1210
} else if(ret != 0) {
1211
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1212
} else if(strcmp(addrstr, ip) != 0){
1213
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1224
ret = connect(tcp_sd, (struct sockaddr *)&to,
1225
sizeof(struct sockaddr_in6));
1227
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1228
sizeof(struct sockaddr_in));
1231
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1232
and if_index != AVAHI_IF_UNSPEC
1233
and connect_to == NULL
1234
and not route_added and
1235
((af == AF_INET6 and not
1236
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1238
or (af == AF_INET and
1239
/* Not a a IPv4LL address */
1240
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1241
& 0xFFFF0000L) != 0xA9FE0000L))){
1242
/* Work around Avahi bug - Avahi does not announce link-local
1243
addresses if it has a global address, so local hosts with
1244
*only* a link-local address (e.g. Mandos clients) cannot
1245
connect to a Mandos server announced by Avahi on a server
1246
host with a global address. Work around this by retrying
1247
with an explicit route added with the server's address.
1249
Avahi bug reference:
1250
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1251
https://bugs.debian.org/587961
1254
fprintf_plus(stderr, "Mandos server unreachable, trying"
1258
route_added = add_local_route(ip, if_index);
1264
if(errno != ECONNREFUSED or debug){
1266
perror_plus("connect");
527
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
528
char addrstr[INET6_ADDRSTRLEN] = "";
529
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
530
sizeof(addrstr)) == NULL){
533
if(strcmp(addrstr, ip) != 0){
534
fprintf(stderr, "Canonical address form: %s\n", addrstr);
539
ret = connect(tcp_sd, &to.in, sizeof(to));
1279
545
const char *out = mandos_protocol_version;
1282
548
size_t out_size = strlen(out);
1283
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1284
out_size - written));
1287
perror_plus("write");
549
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
550
out_size - written));
1289
554
goto mandos_end;
1291
556
written += (size_t)ret;
1292
557
if(written < out_size){
1295
if(out == mandos_protocol_version){
560
if (out == mandos_protocol_version){
1310
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1318
/* This casting via intptr_t is to eliminate warning about casting
1319
an int to a pointer type. This is exactly how the GnuTLS Guile
1320
function "set-session-transport-fd!" does it. */
1321
gnutls_transport_set_ptr(session,
1322
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1330
ret = gnutls_handshake(session);
1335
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1337
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Establishing TLS session with %s\n", ip);
573
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
575
ret = gnutls_handshake (session);
577
if (ret != GNUTLS_E_SUCCESS){
1339
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
579
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1343
583
goto mandos_end;
1346
586
/* Read OpenPGP packet that contains the wanted password */
1349
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
589
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1360
buffer_capacity = incbuffer(&buffer, buffer_length,
1362
if(buffer_capacity == 0){
1364
perror_plus("incbuffer");
1374
sret = gnutls_record_recv(session, buffer+buffer_length,
594
buffer_capacity = adjustbuffer(&buffer, buffer_length,
596
if (buffer_capacity == 0){
597
perror("adjustbuffer");
602
ret = gnutls_record_recv(session, buffer+buffer_length,
1381
609
case GNUTLS_E_INTERRUPTED:
1382
610
case GNUTLS_E_AGAIN:
1384
612
case GNUTLS_E_REHANDSHAKE:
1386
ret = gnutls_handshake(session);
1392
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1394
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
613
ret = gnutls_handshake (session);
615
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1398
618
goto mandos_end;
1402
fprintf_plus(stderr, "Unknown error while reading data from"
1403
" encrypted session with Mandos server\n");
1404
gnutls_bye(session, GNUTLS_SHUT_RDWR);
622
fprintf(stderr, "Unknown error while reading data from"
623
" encrypted session with Mandos server\n");
625
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1406
626
goto mandos_end;
1409
buffer_length += (size_t) sret;
629
buffer_length += (size_t) ret;
1414
fprintf_plus(stderr, "Closing TLS session\n");
1423
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1428
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1430
if(buffer_length > 0){
1431
ssize_t decrypted_buffer_size;
1432
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1433
&decrypted_buffer, mc);
1434
if(decrypted_buffer_size >= 0){
634
fprintf(stderr, "Closing TLS session\n");
637
gnutls_bye (session, GNUTLS_SHUT_RDWR);
639
if (buffer_length > 0){
640
decrypted_buffer_size = pgp_packet_decrypt(buffer,
644
if (decrypted_buffer_size >= 0){
1438
646
while(written < (size_t) decrypted_buffer_size){
1444
ret = (int)fwrite(decrypted_buffer + written, 1,
1445
(size_t)decrypted_buffer_size - written,
647
ret = (int)fwrite (decrypted_buffer + written, 1,
648
(size_t)decrypted_buffer_size - written,
1447
650
if(ret == 0 and ferror(stdout)){
1450
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
652
fprintf(stderr, "Error writing encrypted data: %s\n",
1456
658
written += (size_t)ret;
1458
ret = fflush(stdout);
1462
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
660
free(decrypted_buffer);
1472
666
/* Shutdown procedure */
1477
if(not delete_local_route(ip, if_index)){
1478
fprintf_plus(stderr, "Failed to delete local route to %s on"
1479
" interface %d", ip, if_index);
1483
free(decrypted_buffer);
1486
ret = close(tcp_sd);
1492
perror_plus("close");
1494
gnutls_deinit(session);
671
gnutls_deinit (session);
1504
675
static void resolve_callback(AvahiSServiceResolver *r,
1505
676
AvahiIfIndex interface,
1506
AvahiProtocol proto,
677
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1507
678
AvahiResolverEvent event,
1508
679
const char *name,
1509
680
const char *type,
1618
762
case AVAHI_BROWSER_ALL_FOR_NOW:
1619
763
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1621
fprintf_plus(stderr, "No Mandos server found, still"
765
fprintf(stderr, "No Mandos server found, still searching...\n");
1628
/* Signal handler that stops main loop after SIGTERM */
1629
static void handle_sigterm(int sig){
1634
signal_received = sig;
1635
int old_errno = errno;
1636
/* set main loop to exit */
1637
if(simple_poll != NULL){
1638
avahi_simple_poll_quit(simple_poll);
1643
__attribute__((nonnull, warn_unused_result))
1644
bool get_flags(const char *ifname, struct ifreq *ifr){
1648
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1651
perror_plus("socket");
1655
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1656
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1657
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1661
perror_plus("ioctl SIOCGIFFLAGS");
1664
if((close(s) == -1) and debug){
1666
perror_plus("close");
1671
if((close(s) == -1) and debug){
1673
perror_plus("close");
1679
__attribute__((nonnull, warn_unused_result))
1680
bool good_flags(const char *ifname, const struct ifreq *ifr){
1682
/* Reject the loopback device */
1683
if(ifr->ifr_flags & IFF_LOOPBACK){
1685
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1690
/* Accept point-to-point devices only if connect_to is specified */
1691
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1693
fprintf_plus(stderr, "Accepting point-to-point interface"
1694
" \"%s\"\n", ifname);
1698
/* Otherwise, reject non-broadcast-capable devices */
1699
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1701
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1702
" \"%s\"\n", ifname);
1706
/* Reject non-ARP interfaces (including dummy interfaces) */
1707
if(ifr->ifr_flags & IFF_NOARP){
1709
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1715
/* Accept this device */
1717
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1723
* This function determines if a directory entry in /sys/class/net
1724
* corresponds to an acceptable network device.
1725
* (This function is passed to scandir(3) as a filter function.)
1727
__attribute__((nonnull, warn_unused_result))
1728
int good_interface(const struct dirent *if_entry){
1729
if(if_entry->d_name[0] == '.'){
1734
if(not get_flags(if_entry->d_name, &ifr)){
1736
fprintf_plus(stderr, "Failed to get flags for interface "
1737
"\"%s\"\n", if_entry->d_name);
1742
if(not good_flags(if_entry->d_name, &ifr)){
1749
* This function determines if a network interface is up.
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_up(const char *interface){
1754
if(not get_flags(interface, &ifr)){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1762
return (bool)(ifr.ifr_flags & IFF_UP);
1766
* This function determines if a network interface is running
1768
__attribute__((nonnull, warn_unused_result))
1769
bool interface_is_running(const char *interface){
1771
if(not get_flags(interface, &ifr)){
1773
fprintf_plus(stderr, "Failed to get flags for interface "
1774
"\"%s\"\n", interface);
1779
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1782
__attribute__((nonnull, pure, warn_unused_result))
1783
int notdotentries(const struct dirent *direntry){
1784
/* Skip "." and ".." */
1785
if(direntry->d_name[0] == '.'
1786
and (direntry->d_name[1] == '\0'
1787
or (direntry->d_name[1] == '.'
1788
and direntry->d_name[2] == '\0'))){
1794
/* Is this directory entry a runnable program? */
1795
__attribute__((nonnull, warn_unused_result))
1796
int runnable_hook(const struct dirent *direntry){
1801
if((direntry->d_name)[0] == '\0'){
1806
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1807
"abcdefghijklmnopqrstuvwxyz"
1810
if((direntry->d_name)[sret] != '\0'){
1811
/* Contains non-allowed characters */
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1819
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1822
perror_plus("Could not stat hook");
1826
if(not (S_ISREG(st.st_mode))){
1827
/* Not a regular file */
1829
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1834
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1835
/* Not executable */
1837
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1843
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1849
__attribute__((nonnull, warn_unused_result))
1850
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1851
mandos_context *mc){
1853
struct timespec now;
1854
struct timespec waited_time;
1855
intmax_t block_time;
1858
if(mc->current_server == NULL){
1860
fprintf_plus(stderr, "Wait until first server is found."
1863
ret = avahi_simple_poll_iterate(s, -1);
1866
fprintf_plus(stderr, "Check current_server if we should run"
1869
/* the current time */
1870
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1872
perror_plus("clock_gettime");
1875
/* Calculating in ms how long time between now and server
1876
who we visted longest time ago. Now - last seen. */
1877
waited_time.tv_sec = (now.tv_sec
1878
- mc->current_server->last_seen.tv_sec);
1879
waited_time.tv_nsec = (now.tv_nsec
1880
- mc->current_server->last_seen.tv_nsec);
1881
/* total time is 10s/10,000ms.
1882
Converting to s from ms by dividing by 1,000,
1883
and ns to ms by dividing by 1,000,000. */
1884
block_time = ((retry_interval
1885
- ((intmax_t)waited_time.tv_sec * 1000))
1886
- ((intmax_t)waited_time.tv_nsec / 1000000));
1889
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1893
if(block_time <= 0){
1894
ret = start_mandos_communication(mc->current_server->ip,
1895
mc->current_server->port,
1896
mc->current_server->if_index,
1897
mc->current_server->af, mc);
1899
avahi_simple_poll_quit(s);
1902
ret = clock_gettime(CLOCK_MONOTONIC,
1903
&mc->current_server->last_seen);
1905
perror_plus("clock_gettime");
1908
mc->current_server = mc->current_server->next;
1909
block_time = 0; /* Call avahi to find new Mandos
1910
servers, but don't block */
1913
ret = avahi_simple_poll_iterate(s, (int)block_time);
1916
if(ret > 0 or errno != EINTR){
1917
return (ret != 1) ? ret : 0;
1923
__attribute__((nonnull))
1924
void run_network_hooks(const char *mode, const char *interface,
1926
struct dirent **direntries = NULL;
1927
if(hookdir_fd == -1){
1928
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1930
if(hookdir_fd == -1){
1931
if(errno == ENOENT){
1933
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1934
" found\n", hookdir);
1937
perror_plus("open");
1942
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1944
perror_plus("open(\"/dev/null\", O_RDONLY)");
1947
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1948
runnable_hook, alphasort);
1950
perror_plus("scandir");
1954
struct dirent *direntry;
1956
for(int i = 0; i < numhooks; i++){
1957
direntry = direntries[i];
1959
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1962
pid_t hook_pid = fork();
1965
/* Raise privileges */
1966
errno = raise_privileges_permanently();
1968
perror_plus("Failed to raise privileges");
1975
perror_plus("setgid");
1978
/* Reset supplementary groups */
1980
ret = setgroups(0, NULL);
1982
perror_plus("setgroups");
1985
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1987
perror_plus("setenv");
1990
ret = setenv("DEVICE", interface, 1);
1992
perror_plus("setenv");
1995
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1997
perror_plus("setenv");
2000
ret = setenv("MODE", mode, 1);
2002
perror_plus("setenv");
2006
ret = asprintf(&delaystring, "%f", (double)delay);
2008
perror_plus("asprintf");
2011
ret = setenv("DELAY", delaystring, 1);
2014
perror_plus("setenv");
2018
if(connect_to != NULL){
2019
ret = setenv("CONNECT", connect_to, 1);
2021
perror_plus("setenv");
2025
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2029
perror_plus("openat");
2030
_exit(EXIT_FAILURE);
2032
if(close(hookdir_fd) == -1){
2033
perror_plus("close");
2034
_exit(EXIT_FAILURE);
2036
ret = dup2(devnull, STDIN_FILENO);
2038
perror_plus("dup2(devnull, STDIN_FILENO)");
2041
ret = close(devnull);
2043
perror_plus("close");
2046
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2048
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2051
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2053
perror_plus("fexecve");
2054
_exit(EXIT_FAILURE);
2058
perror_plus("fork");
2063
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2064
perror_plus("waitpid");
2068
if(WIFEXITED(status)){
2069
if(WEXITSTATUS(status) != 0){
2070
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2071
" with status %d\n", direntry->d_name,
2072
WEXITSTATUS(status));
2076
} else if(WIFSIGNALED(status)){
2077
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2078
" signal %d\n", direntry->d_name,
2083
fprintf_plus(stderr, "Warning: network hook \"%s\""
2084
" crashed\n", direntry->d_name);
2090
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2096
if(close(hookdir_fd) == -1){
2097
perror_plus("close");
2104
__attribute__((nonnull, warn_unused_result))
2105
int bring_up_interface(const char *const interface,
2107
int old_errno = errno;
2109
struct ifreq network;
2110
unsigned int if_index = if_nametoindex(interface);
2112
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2122
if(not interface_is_up(interface)){
2124
int ioctl_errno = 0;
2125
if(not get_flags(interface, &network)){
2127
fprintf_plus(stderr, "Failed to get flags for interface "
2128
"\"%s\"\n", interface);
2132
network.ifr_flags |= IFF_UP; /* set flag */
2134
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2137
perror_plus("socket");
2145
perror_plus("close");
2152
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2156
/* Raise privileges */
2157
ret_errno = raise_privileges();
2160
perror_plus("Failed to raise privileges");
2165
bool restore_loglevel = false;
2167
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2168
messages about the network interface to mess up the prompt */
2169
ret_linux = klogctl(8, NULL, 5);
2170
if(ret_linux == -1){
2171
perror_plus("klogctl");
2173
restore_loglevel = true;
2176
#endif /* __linux__ */
2177
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2178
ioctl_errno = errno;
2180
if(restore_loglevel){
2181
ret_linux = klogctl(7, NULL, 0);
2182
if(ret_linux == -1){
2183
perror_plus("klogctl");
2186
#endif /* __linux__ */
2188
/* If raise_privileges() succeeded above */
2190
/* Lower privileges */
2191
ret_errno = lower_privileges();
2194
perror_plus("Failed to lower privileges");
2198
/* Close the socket */
2201
perror_plus("close");
2204
if(ret_setflags == -1){
2205
errno = ioctl_errno;
2206
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2211
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2215
/* Sleep checking until interface is running.
2216
Check every 0.25s, up to total time of delay */
2217
for(int i = 0; i < delay * 4; i++){
2218
if(interface_is_running(interface)){
2221
struct timespec sleeptime = { .tv_nsec = 250000000 };
2222
ret = nanosleep(&sleeptime, NULL);
2223
if(ret == -1 and errno != EINTR){
2224
perror_plus("nanosleep");
2232
__attribute__((nonnull, warn_unused_result))
2233
int take_down_interface(const char *const interface){
2234
int old_errno = errno;
2235
struct ifreq network;
2236
unsigned int if_index = if_nametoindex(interface);
2238
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2242
if(interface_is_up(interface)){
2244
int ioctl_errno = 0;
2245
if(not get_flags(interface, &network) and debug){
2247
fprintf_plus(stderr, "Failed to get flags for interface "
2248
"\"%s\"\n", interface);
2252
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2254
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2257
perror_plus("socket");
2263
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2267
/* Raise privileges */
2268
ret_errno = raise_privileges();
2271
perror_plus("Failed to raise privileges");
2274
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2275
ioctl_errno = errno;
2277
/* If raise_privileges() succeeded above */
2279
/* Lower privileges */
2280
ret_errno = lower_privileges();
2283
perror_plus("Failed to lower privileges");
2287
/* Close the socket */
2288
int ret = close(sd);
2290
perror_plus("close");
2293
if(ret_setflags == -1){
2294
errno = ioctl_errno;
2295
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2300
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
771
/* Combines file name and path and returns the malloced new
772
string. some sane checks could/should be added */
773
static const char *combinepath(const char *first, const char *second){
774
size_t f_len = strlen(first);
775
size_t s_len = strlen(second);
776
char *tmp = malloc(f_len + s_len + 2);
781
memcpy(tmp, first, f_len); /* Spurious warning */
785
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
787
tmp[f_len + 1 + s_len] = '\0';
2308
792
int main(int argc, char *argv[]){
2309
mandos_context mc = { .server = NULL, .dh_bits = 0,
2310
.priority = "SECURE256:!CTYPE-X.509"
2311
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2312
.current_server = NULL, .interfaces = NULL,
2313
.interfaces_size = 0 };
2314
AvahiSServiceBrowser *sb = NULL;
2319
int exitcode = EXIT_SUCCESS;
2320
char *interfaces_to_take_down = NULL;
2321
size_t interfaces_to_take_down_size = 0;
2322
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2323
char old_tempdir[] = "/tmp/mandosXXXXXX";
2324
char *tempdir = NULL;
2325
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2326
const char *seckey = PATHDIR "/" SECKEY;
2327
const char *pubkey = PATHDIR "/" PUBKEY;
2328
const char *dh_params_file = NULL;
2329
char *interfaces_hooks = NULL;
2331
bool gnutls_initialized = false;
2332
bool gpgme_initialized = false;
2334
double retry_interval = 10; /* 10s between trying a server and
2335
retrying the same server again */
2337
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2338
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2343
/* Lower any group privileges we might have, just to be safe */
2347
perror_plus("setgid");
2350
/* Lower user privileges (temporarily) */
2354
perror_plus("seteuid");
2362
struct argp_option options[] = {
2363
{ .name = "debug", .key = 128,
2364
.doc = "Debug mode", .group = 3 },
2365
{ .name = "connect", .key = 'c',
2366
.arg = "ADDRESS:PORT",
2367
.doc = "Connect directly to a specific Mandos server",
2369
{ .name = "interface", .key = 'i',
2371
.doc = "Network interface that will be used to search for"
2374
{ .name = "seckey", .key = 's',
2376
.doc = "OpenPGP secret key file base name",
2378
{ .name = "pubkey", .key = 'p',
2380
.doc = "OpenPGP public key file base name",
2382
{ .name = "dh-bits", .key = 129,
2384
.doc = "Bit length of the prime number used in the"
2385
" Diffie-Hellman key exchange",
2387
{ .name = "dh-params", .key = 134,
2389
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2390
" for the Diffie-Hellman key exchange",
2392
{ .name = "priority", .key = 130,
2394
.doc = "GnuTLS priority string for the TLS handshake",
2396
{ .name = "delay", .key = 131,
2398
.doc = "Maximum delay to wait for interface startup",
2400
{ .name = "retry", .key = 132,
2402
.doc = "Retry interval used when denied by the Mandos server",
2404
{ .name = "network-hook-dir", .key = 133,
2406
.doc = "Directory where network hooks are located",
2409
* These reproduce what we would get without ARGP_NO_HELP
2411
{ .name = "help", .key = '?',
2412
.doc = "Give this help list", .group = -1 },
2413
{ .name = "usage", .key = -3,
2414
.doc = "Give a short usage message", .group = -1 },
2415
{ .name = "version", .key = 'V',
2416
.doc = "Print program version", .group = -1 },
2420
error_t parse_opt(int key, char *arg,
2421
struct argp_state *state){
2424
case 128: /* --debug */
2427
case 'c': /* --connect */
2430
case 'i': /* --interface */
2431
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2434
argp_error(state, "%s", strerror(ret_errno));
2437
case 's': /* --seckey */
2440
case 'p': /* --pubkey */
2443
case 129: /* --dh-bits */
2445
tmpmax = strtoimax(arg, &tmp, 10);
2446
if(errno != 0 or tmp == arg or *tmp != '\0'
2447
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2448
argp_error(state, "Bad number of DH bits");
2450
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2452
case 134: /* --dh-params */
2453
dh_params_file = arg;
2455
case 130: /* --priority */
2458
case 131: /* --delay */
2460
delay = strtof(arg, &tmp);
2461
if(errno != 0 or tmp == arg or *tmp != '\0'){
2462
argp_error(state, "Bad delay");
2464
case 132: /* --retry */
2466
retry_interval = strtod(arg, &tmp);
2467
if(errno != 0 or tmp == arg or *tmp != '\0'
2468
or (retry_interval * 1000) > INT_MAX
2469
or retry_interval < 0){
2470
argp_error(state, "Bad retry interval");
2473
case 133: /* --network-hook-dir */
2477
* These reproduce what we would get without ARGP_NO_HELP
2479
case '?': /* --help */
2480
argp_state_help(state, state->out_stream,
2481
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2482
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2483
case -3: /* --usage */
2484
argp_state_help(state, state->out_stream,
2485
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2486
case 'V': /* --version */
2487
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2488
exit(argp_err_exit_status);
2491
return ARGP_ERR_UNKNOWN;
2496
struct argp argp = { .options = options, .parser = parse_opt,
2498
.doc = "Mandos client -- Get and decrypt"
2499
" passwords from a Mandos server" };
2500
ret_errno = argp_parse(&argp, argc, argv,
2501
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2508
perror_plus("argp_parse");
2509
exitcode = EX_OSERR;
2512
exitcode = EX_USAGE;
2518
/* Work around Debian bug #633582:
2519
<https://bugs.debian.org/633582> */
2521
/* Re-raise privileges */
2522
ret = raise_privileges();
2525
perror_plus("Failed to raise privileges");
2529
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2530
int seckey_fd = open(seckey, O_RDONLY);
2531
if(seckey_fd == -1){
2532
perror_plus("open");
2534
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2536
perror_plus("fstat");
2538
if(S_ISREG(st.st_mode)
2539
and st.st_uid == 0 and st.st_gid == 0){
2540
ret = fchown(seckey_fd, uid, gid);
2542
perror_plus("fchown");
2550
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2551
int pubkey_fd = open(pubkey, O_RDONLY);
2552
if(pubkey_fd == -1){
2553
perror_plus("open");
2555
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2557
perror_plus("fstat");
2559
if(S_ISREG(st.st_mode)
2560
and st.st_uid == 0 and st.st_gid == 0){
2561
ret = fchown(pubkey_fd, uid, gid);
2563
perror_plus("fchown");
2571
if(dh_params_file != NULL
2572
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2573
int dhparams_fd = open(dh_params_file, O_RDONLY);
2574
if(dhparams_fd == -1){
2575
perror_plus("open");
2577
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2579
perror_plus("fstat");
2581
if(S_ISREG(st.st_mode)
2582
and st.st_uid == 0 and st.st_gid == 0){
2583
ret = fchown(dhparams_fd, uid, gid);
2585
perror_plus("fchown");
2593
/* Lower privileges */
2594
ret = lower_privileges();
2597
perror_plus("Failed to lower privileges");
2602
/* Remove invalid interface names (except "none") */
2604
char *interface = NULL;
2605
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2607
if(strcmp(interface, "none") != 0
2608
and if_nametoindex(interface) == 0){
2609
if(interface[0] != '\0'){
2610
fprintf_plus(stderr, "Not using nonexisting interface"
2611
" \"%s\"\n", interface);
2613
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2619
/* Run network hooks */
2621
if(mc.interfaces != NULL){
2622
interfaces_hooks = malloc(mc.interfaces_size);
2623
if(interfaces_hooks == NULL){
2624
perror_plus("malloc");
2627
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2628
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2630
run_network_hooks("start", interfaces_hooks != NULL ?
2631
interfaces_hooks : "", delay);
2635
avahi_set_log_function(empty_log);
2638
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2639
from the signal handler */
2640
/* Initialize the pseudo-RNG for Avahi */
2641
srand((unsigned int) time(NULL));
2642
simple_poll = avahi_simple_poll_new();
2643
if(simple_poll == NULL){
2644
fprintf_plus(stderr,
2645
"Avahi: Failed to create simple poll object.\n");
2646
exitcode = EX_UNAVAILABLE;
2650
sigemptyset(&sigterm_action.sa_mask);
2651
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2653
perror_plus("sigaddset");
2654
exitcode = EX_OSERR;
2657
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2659
perror_plus("sigaddset");
2660
exitcode = EX_OSERR;
2663
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2665
perror_plus("sigaddset");
2666
exitcode = EX_OSERR;
2669
/* Need to check if the handler is SIG_IGN before handling:
2670
| [[info:libc:Initial Signal Actions]] |
2671
| [[info:libc:Basic Signal Handling]] |
2673
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2675
perror_plus("sigaction");
2678
if(old_sigterm_action.sa_handler != SIG_IGN){
2679
ret = sigaction(SIGINT, &sigterm_action, NULL);
2681
perror_plus("sigaction");
2682
exitcode = EX_OSERR;
2686
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2688
perror_plus("sigaction");
2691
if(old_sigterm_action.sa_handler != SIG_IGN){
2692
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2694
perror_plus("sigaction");
2695
exitcode = EX_OSERR;
2699
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2701
perror_plus("sigaction");
2704
if(old_sigterm_action.sa_handler != SIG_IGN){
2705
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2707
perror_plus("sigaction");
2708
exitcode = EX_OSERR;
2713
/* If no interfaces were specified, make a list */
2714
if(mc.interfaces == NULL){
2715
struct dirent **direntries = NULL;
2716
/* Look for any good interfaces */
2717
ret = scandir(sys_class_net, &direntries, good_interface,
2720
/* Add all found interfaces to interfaces list */
2721
for(int i = 0; i < ret; ++i){
2722
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2723
direntries[i]->d_name);
2726
perror_plus("argz_add");
2727
free(direntries[i]);
2731
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2732
direntries[i]->d_name);
2734
free(direntries[i]);
2741
fprintf_plus(stderr, "Could not find a network interface\n");
793
AvahiSServiceBrowser *sb = NULL;
796
int exitcode = EXIT_SUCCESS;
797
const char *interface = "eth0";
798
struct ifreq network;
802
char *connect_to = NULL;
803
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
804
const char *pubkeyfile = "pubkey.txt";
805
const char *seckeyfile = "seckey.txt";
806
mandos_context mc = { .simple_poll = NULL, .server = NULL,
807
.dh_bits = 1024, .priority = "SECURE256"};
808
bool gnutls_initalized = false;
811
struct argp_option options[] = {
812
{ .name = "debug", .key = 128,
813
.doc = "Debug mode", .group = 3 },
814
{ .name = "connect", .key = 'c',
816
.doc = "Connect directly to a sepcified mandos server",
818
{ .name = "interface", .key = 'i',
820
.doc = "Interface that Avahi will conntect through",
822
{ .name = "keydir", .key = 'd',
824
.doc = "Directory where the openpgp keyring is",
826
{ .name = "seckey", .key = 's',
828
.doc = "Secret openpgp key for gnutls authentication",
830
{ .name = "pubkey", .key = 'p',
832
.doc = "Public openpgp key for gnutls authentication",
834
{ .name = "dh-bits", .key = 129,
836
.doc = "dh-bits to use in gnutls communication",
838
{ .name = "priority", .key = 130,
840
.doc = "GNUTLS priority", .group = 1 },
845
error_t parse_opt (int key, char *arg,
846
struct argp_state *state) {
847
/* Get the INPUT argument from `argp_parse', which we know is
848
a pointer to our plugin list pointer. */
870
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
885
return ARGP_ERR_UNKNOWN;
890
struct argp argp = { .options = options, .parser = parse_opt,
892
.doc = "Mandos client -- Get and decrypt"
893
" passwords from mandos server" };
894
argp_parse (&argp, argc, argv, 0, 0, NULL);
897
pubkeyfile = combinepath(keydir, pubkeyfile);
898
if (pubkeyfile == NULL){
899
perror("combinepath");
2742
900
exitcode = EXIT_FAILURE;
2747
/* Bring up interfaces which are down, and remove any "none"s */
2749
char *interface = NULL;
2750
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2752
/* If interface name is "none", stop bringing up interfaces.
2753
Also remove all instances of "none" from the list */
2754
if(strcmp(interface, "none") == 0){
2755
argz_delete(&mc.interfaces, &mc.interfaces_size,
2758
while((interface = argz_next(mc.interfaces,
2759
mc.interfaces_size, interface))){
2760
if(strcmp(interface, "none") == 0){
2761
argz_delete(&mc.interfaces, &mc.interfaces_size,
2768
bool interface_was_up = interface_is_up(interface);
2769
errno = bring_up_interface(interface, delay);
2770
if(not interface_was_up){
2772
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2773
" %s\n", interface, strerror(errno));
2775
errno = argz_add(&interfaces_to_take_down,
2776
&interfaces_to_take_down_size,
2779
perror_plus("argz_add");
2784
if(debug and (interfaces_to_take_down == NULL)){
2785
fprintf_plus(stderr, "No interfaces were brought up\n");
2789
/* If we only got one interface, explicitly use only that one */
2790
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2792
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2795
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2802
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2804
fprintf_plus(stderr, "init_gnutls_global failed\n");
2805
exitcode = EX_UNAVAILABLE;
2808
gnutls_initialized = true;
2815
/* Try /run/tmp before /tmp */
2816
tempdir = mkdtemp(run_tempdir);
2817
if(tempdir == NULL and errno == ENOENT){
2819
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2820
run_tempdir, old_tempdir);
2822
tempdir = mkdtemp(old_tempdir);
2824
if(tempdir == NULL){
2825
perror_plus("mkdtemp");
2833
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2834
fprintf_plus(stderr, "init_gpgme failed\n");
2835
exitcode = EX_UNAVAILABLE;
2838
gpgme_initialized = true;
2845
if(connect_to != NULL){
2846
/* Connect directly, do not use Zeroconf */
2847
/* (Mainly meant for debugging) */
2848
char *address = strrchr(connect_to, ':');
2850
if(address == NULL){
2851
fprintf_plus(stderr, "No colon in address\n");
2852
exitcode = EX_USAGE;
2862
tmpmax = strtoimax(address+1, &tmp, 10);
2863
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2864
or tmpmax != (in_port_t)tmpmax){
2865
fprintf_plus(stderr, "Bad port number\n");
2866
exitcode = EX_USAGE;
2874
port = (in_port_t)tmpmax;
2876
/* Colon in address indicates IPv6 */
2878
if(strchr(connect_to, ':') != NULL){
2880
/* Accept [] around IPv6 address - see RFC 5952 */
2881
if(connect_to[0] == '[' and address[-1] == ']')
904
seckeyfile = combinepath(keydir, seckeyfile);
905
if (seckeyfile == NULL){
906
perror("combinepath");
910
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
912
fprintf(stderr, "init_gnutls_global\n");
2889
address = connect_to;
915
gnutls_initalized = true;
931
if_index = (AvahiIfIndex) if_nametoindex(interface);
933
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
if(connect_to != NULL){
938
/* Connect directly, do not use Zeroconf */
939
/* (Mainly meant for debugging) */
940
char *address = strrchr(connect_to, ':');
942
fprintf(stderr, "No colon in address\n");
943
exitcode = EXIT_FAILURE;
947
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
perror("Bad port number");
950
exitcode = EXIT_FAILURE;
954
address = connect_to;
955
ret = start_mandos_communication(address, port, if_index, &mc);
957
exitcode = EXIT_FAILURE;
959
exitcode = EXIT_SUCCESS;
2895
while(not quit_now){
2896
ret = start_mandos_communication(address, port, if_index, af,
2898
if(quit_now or ret == 0){
2902
fprintf_plus(stderr, "Retrying in %d seconds\n",
2903
(int)retry_interval);
2905
sleep((unsigned int)retry_interval);
2909
exitcode = EXIT_SUCCESS;
2920
AvahiServerConfig config;
2921
/* Do not publish any local Zeroconf records */
2922
avahi_server_config_init(&config);
2923
config.publish_hinfo = 0;
2924
config.publish_addresses = 0;
2925
config.publish_workstation = 0;
2926
config.publish_domain = 0;
2928
/* Allocate a new server */
2929
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2930
&config, NULL, NULL, &ret);
2932
/* Free the Avahi configuration data */
2933
avahi_server_config_free(&config);
2936
/* Check if creating the Avahi server object succeeded */
2937
if(mc.server == NULL){
2938
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2939
avahi_strerror(ret));
2940
exitcode = EX_UNAVAILABLE;
2948
/* Create the Avahi service browser */
2949
sb = avahi_s_service_browser_new(mc.server, if_index,
2950
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2951
NULL, 0, browse_callback,
2954
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2955
avahi_strerror(avahi_server_errno(mc.server)));
2956
exitcode = EX_UNAVAILABLE;
2964
/* Run the main loop */
2967
fprintf_plus(stderr, "Starting Avahi loop search\n");
2970
ret = avahi_loop_with_timeout(simple_poll,
2971
(int)(retry_interval * 1000), &mc);
2973
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2974
(ret == 0) ? "successfully" : "with error");
964
/* If the interface is down, bring it up */
966
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
969
exitcode = EXIT_FAILURE;
972
strcpy(network.ifr_name, interface); /* Spurious warning */
973
ret = ioctl(sd, SIOCGIFFLAGS, &network);
975
perror("ioctl SIOCGIFFLAGS");
976
exitcode = EXIT_FAILURE;
979
if((network.ifr_flags & IFF_UP) == 0){
980
network.ifr_flags |= IFF_UP;
981
ret = ioctl(sd, SIOCSIFFLAGS, &network);
983
perror("ioctl SIOCSIFFLAGS");
984
exitcode = EXIT_FAILURE;
992
avahi_set_log_function(empty_log);
995
/* Initialize the pseudo-RNG for Avahi */
996
srand((unsigned int) time(NULL));
998
/* Allocate main Avahi loop object */
999
mc.simple_poll = avahi_simple_poll_new();
1000
if (mc.simple_poll == NULL) {
1001
fprintf(stderr, "Avahi: Failed to create simple poll"
1003
exitcode = EXIT_FAILURE;
1008
AvahiServerConfig config;
1009
/* Do not publish any local Zeroconf records */
1010
avahi_server_config_init(&config);
1011
config.publish_hinfo = 0;
1012
config.publish_addresses = 0;
1013
config.publish_workstation = 0;
1014
config.publish_domain = 0;
1016
/* Allocate a new server */
1017
mc.server = avahi_server_new(avahi_simple_poll_get
1018
(mc.simple_poll), &config, NULL,
1021
/* Free the Avahi configuration data */
1022
avahi_server_config_free(&config);
1025
/* Check if creating the Avahi server object succeeded */
1026
if (mc.server == NULL) {
1027
fprintf(stderr, "Failed to create Avahi server: %s\n",
1028
avahi_strerror(error));
1029
exitcode = EXIT_FAILURE;
1033
/* Create the Avahi service browser */
1034
sb = avahi_s_service_browser_new(mc.server, if_index,
1036
"_mandos._tcp", NULL, 0,
1037
browse_callback, &mc);
1039
fprintf(stderr, "Failed to create service browser: %s\n",
1040
avahi_strerror(avahi_server_errno(mc.server)));
1041
exitcode = EXIT_FAILURE;
1045
/* Run the main loop */
1048
fprintf(stderr, "Starting Avahi loop search\n");
1051
avahi_simple_poll_loop(mc.simple_poll);
2980
if(signal_received){
2981
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2982
argv[0], signal_received,
2983
strsignal(signal_received));
2985
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2989
/* Cleanup things */
2990
free(mc.interfaces);
2993
avahi_s_service_browser_free(sb);
2995
if(mc.server != NULL)
2996
avahi_server_free(mc.server);
2998
if(simple_poll != NULL)
2999
avahi_simple_poll_free(simple_poll);
3001
if(gnutls_initialized){
3002
gnutls_certificate_free_credentials(mc.cred);
3003
gnutls_dh_params_deinit(mc.dh_params);
3006
if(gpgme_initialized){
3007
gpgme_release(mc.ctx);
3010
/* Cleans up the circular linked list of Mandos servers the client
3012
if(mc.current_server != NULL){
3013
mc.current_server->prev->next = NULL;
3014
while(mc.current_server != NULL){
3015
server *next = mc.current_server->next;
3017
#pragma GCC diagnostic push
3018
#pragma GCC diagnostic ignored "-Wcast-qual"
3020
free((char *)(mc.current_server->ip));
3022
#pragma GCC diagnostic pop
3024
free(mc.current_server);
3025
mc.current_server = next;
3029
/* Re-raise privileges */
3031
ret = raise_privileges();
3034
perror_plus("Failed to raise privileges");
3037
/* Run network hooks */
3038
run_network_hooks("stop", interfaces_hooks != NULL ?
3039
interfaces_hooks : "", delay);
3041
/* Take down the network interfaces which were brought up */
3043
char *interface = NULL;
3044
while((interface = argz_next(interfaces_to_take_down,
3045
interfaces_to_take_down_size,
3047
ret = take_down_interface(interface);
3050
perror_plus("Failed to take down interface");
3053
if(debug and (interfaces_to_take_down == NULL)){
3054
fprintf_plus(stderr, "No interfaces needed to be taken"
3060
ret = lower_privileges_permanently();
3063
perror_plus("Failed to lower privileges permanently");
3067
free(interfaces_to_take_down);
3068
free(interfaces_hooks);
3070
void clean_dir_at(int base, const char * const dirname,
3072
struct dirent **direntries = NULL;
3074
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3080
perror_plus("open");
3083
int numentries = scandirat(dir_fd, ".", &direntries,
3084
notdotentries, alphasort);
3085
if(numentries >= 0){
3086
for(int i = 0; i < numentries; i++){
3088
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3089
dirname, direntries[i]->d_name);
3091
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3093
if(errno == EISDIR){
3094
dret = unlinkat(dir_fd, direntries[i]->d_name,
3097
if((dret == -1) and (errno == ENOTEMPTY)
3098
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3099
== 0) and (level == 0)){
3100
/* Recurse only in this special case */
3101
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3104
if((dret == -1) and (errno != ENOENT)){
3105
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3106
direntries[i]->d_name, strerror(errno));
3109
free(direntries[i]);
3112
/* need to clean even if 0 because man page doesn't specify */
3114
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3115
if(dret == -1 and errno != ENOENT){
3116
perror_plus("rmdir");
3119
perror_plus("scandirat");
3124
/* Removes the GPGME temp directory and all files inside */
3125
if(tempdir != NULL){
3126
clean_dir_at(-1, tempdir, 0);
3130
sigemptyset(&old_sigterm_action.sa_mask);
3131
old_sigterm_action.sa_handler = SIG_DFL;
3132
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3133
&old_sigterm_action,
3136
perror_plus("sigaction");
3139
ret = raise(signal_received);
3140
} while(ret != 0 and errno == EINTR);
3142
perror_plus("raise");
3145
TEMP_FAILURE_RETRY(pause());
1056
fprintf(stderr, "%s exiting\n", argv[0]);
1059
/* Cleanup things */
1061
avahi_s_service_browser_free(sb);
1063
if (mc.server != NULL)
1064
avahi_server_free(mc.server);
1066
if (mc.simple_poll != NULL)
1067
avahi_simple_poll_free(mc.simple_poll);
1071
if (gnutls_initalized){
1072
gnutls_certificate_free_credentials (mc.cred);
1073
gnutls_global_deinit ();