9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
15
* This program is free software: you can redistribute it and/or
16
* modify it under the terms of the GNU General Public License as
17
* published by the Free Software Foundation, either version 3 of the
18
* License, or (at your option) any later version.
20
* This program is distributed in the hope that it will be useful, but
12
* Copyright © 2008-2022 Teddy Hogeborn
13
* Copyright © 2008-2022 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
21
23
* WITHOUT ANY WARRANTY; without even the implied warranty of
22
24
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
23
25
* General Public License for more details.
25
27
* You should have received a copy of the GNU General Public License
26
* along with this program. If not, see
27
* <http://www.gnu.org/licenses/>.
28
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
* Contact the authors at <mandos@recompile.se>.
32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
34
#ifndef _LARGEFILE_SOURCE
33
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
37
#ifndef _FILE_OFFSET_BITS
34
38
#define _FILE_OFFSET_BITS 64
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
40
#include <stdint.h> /* uint16_t, uint32_t */
41
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
#include <stdbool.h> /* bool, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
53
#include <sys/stat.h> /* open() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
57
#include <fcntl.h> /* open() */
58
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
#include <inttypes.h> /* PRIu16, SCNu16 */
61
#include <assert.h> /* assert() */
62
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
64
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
65
SIOCSIFFLAGS, if_indextoname(),
66
if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
68
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
getuid(), getgid(), setuid(),
71
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
73
#include <argp.h> /* struct argp_option, error_t, struct
74
argp_state, struct argp,
75
argp_parse(), ARGP_KEY_ARG,
76
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
39
#endif /* not _FILE_OFFSET_BITS */
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
44
#include <stdbool.h> /* bool, false, true */
45
#include <argp.h> /* argp_program_version,
46
argp_program_bug_address,
48
struct argp_state, argp_error(),
52
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
54
ARGP_ERR_UNKNOWN, struct argp,
55
argp_parse(), ARGP_IN_ORDER,
57
#include <stddef.h> /* NULL, size_t */
58
#include <sys/types.h> /* uid_t, gid_t, sig_atomic_t,
59
seteuid(), setuid(), pid_t,
60
setgid(), getuid(), getgid() */
61
#include <unistd.h> /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
62
seteuid(), setuid(), close(),
63
ssize_t, read(), fork(), setgid(),
64
_exit(), dup2(), STDIN_FILENO,
65
STDERR_FILENO, STDOUT_FILENO,
66
fexecve(), write(), getuid(),
67
getgid(), fchown(), symlink(),
68
sleep(), unlinkat(), pause() */
69
#include <netinet/in.h> /* in_port_t, struct sockaddr_in6,
70
sa_family_t, struct sockaddr_in,
71
htons(), IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
73
ntohl(), IPPROTO_IP */
74
#include <time.h> /* struct timespec, clock_gettime(),
75
CLOCK_MONOTONIC, time_t, struct tm,
76
gmtime_r(), clock_settime(),
77
CLOCK_REALTIME, nanosleep() */
78
#include <errno.h> /* errno,
79
program_invocation_short_name,
80
EINTR, EINVAL, ENETUNREACH,
81
EHOSTUNREACH, ECONNREFUSED, EPROTO,
82
EIO, ENOENT, ENXIO, error_t,
83
ENOMEM, EISDIR, ENOTEMPTY */
84
#include <stdio.h> /* fprintf(), stderr, perror(), FILE,
85
vfprintf(), off_t, SEEK_SET,
86
stdout, fwrite(), ferror(),
87
fflush(), asprintf() */
88
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
89
#include <stdlib.h> /* realloc(), free(), malloc(),
90
getenv(), EXIT_FAILURE, setenv(),
91
EXIT_SUCCESS, strtof(), strtod(),
92
srand(), mkdtemp(), abort() */
93
#include <string.h> /* strdup(), strcmp(), strlen(),
94
strerror(), strncpy(), strspn(),
95
memcpy(), strrchr(), strchr(),
97
#include <fcntl.h> /* open(), O_RDONLY, O_DIRECTORY,
98
O_PATH, O_CLOEXEC, openat(),
99
O_NOFOLLOW, AT_REMOVEDIR */
100
#include <iso646.h> /* or, and, not */
101
#include <sys/stat.h> /* struct stat, fstat(), fstatat(),
102
S_ISREG(), S_IXUSR, S_IXGRP,
104
#include <net/if.h> /* IF_NAMESIZE, if_indextoname(),
105
if_nametoindex(), SIOCGIFFLAGS,
106
IFF_LOOPBACK, IFF_POINTOPOINT,
107
IFF_BROADCAST, IFF_NOARP, IFF_UP,
108
IFF_RUNNING, SIOCSIFFLAGS */
109
#include <sysexits.h> /* EX_NOPERM, EX_OSERR,
110
EX_UNAVAILABLE, EX_USAGE */
111
#include <grp.h> /* setgroups() */
112
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
113
WEXITSTATUS(), WIFSIGNALED(),
115
#include <signal.h> /* kill(), SIGTERM, struct sigaction,
116
SIG_DFL, sigemptyset(),
117
sigaddset(), SIGINT, SIGHUP,
119
#include <sys/socket.h> /* struct sockaddr_storage, AF_INET6,
120
PF_INET6, AF_INET, PF_INET,
121
socket(), SOCK_STREAM,
122
SOCK_CLOEXEC, struct sockaddr,
123
connect(), SOCK_DGRAM */
124
#include <argz.h> /* argz_next(), argz_add_sep(),
125
argz_delete(), argz_stringify(),
126
argz_add(), argz_count() */
127
#include <inttypes.h> /* PRIuMAX, uintmax_t, uint32_t,
128
PRIdMAX, PRIu16, intmax_t,
130
#include <arpa/inet.h> /* inet_pton() */
131
#include <stdint.h> /* uint32_t, intptr_t, uint16_t */
132
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
133
EAI_SYSTEM, gai_strerror() */
134
#include <sys/ioctl.h> /* ioctl() */
135
#include <dirent.h> /* struct dirent, scandirat(),
136
alphasort(), scandir() */
137
#include <limits.h> /* INT_MAX */
140
#include <sys/klog.h> /* klogctl() */
141
#endif /* __linux__ */
79
144
/* All Avahi types, constants and functions
90
155
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
93
init_gnutls_session(),
156
functions: gnutls_*, GNUTLS_* */
157
#if GNUTLS_VERSION_NUMBER < 0x030600
95
158
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
97
GNUTLS_OPENPGP_FMT_BASE64 */
159
/* gnutls_certificate_set_openpgp_key_file(),
160
GNUTLS_OPENPGP_FMT_BASE64 */
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
162
#include <gnutls/x509.h> /* GNUTLS_PKCS_PLAIN,
163
GNUTLS_PKCS_NULL_PASSWORD */
100
167
#include <gpgme.h> /* All GPGME types, constants and
103
GPGME_PROTOCOL_OpenPGP,
169
gpgme_*, GPG_ERR_NO_*,
171
GPGME_PROTOCOL_OpenPGP */
106
173
#define BUFFER_SIZE 256
108
175
#define PATHDIR "/conf/conf.d/mandos"
109
176
#define SECKEY "seckey.txt"
110
177
#define PUBKEY "pubkey.txt"
178
#define TLS_PRIVKEY "tls-privkey.pem"
179
#define TLS_PUBKEY "tls-pubkey.pem"
180
#define HOOKDIR "/lib/mandos/network-hooks.d"
112
182
bool debug = false;
113
183
static const char mandos_protocol_version[] = "1";
114
184
const char *argp_program_version = "mandos-client " VERSION;
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
185
const char *argp_program_bug_address = "<mandos@recompile.se>";
186
static const char sys_class_net[] = "/sys/class/net";
187
char *connect_to = NULL;
188
const char *hookdir = HOOKDIR;
193
/* Doubly linked list that need to be circularly linked when used */
194
typedef struct server{
197
AvahiIfIndex if_index;
199
struct timespec last_seen;
117
204
/* Used for passing in values through the Avahi callback functions */
119
AvahiSimplePoll *simple_poll;
120
206
AvahiServer *server;
121
207
gnutls_certificate_credentials_t cred;
122
208
unsigned int dh_bits;
123
209
gnutls_dh_params_t dh_params;
124
210
const char *priority;
212
server *current_server;
214
size_t interfaces_size;
126
215
} mandos_context;
217
/* global so signal handler can reach it*/
218
AvahiSimplePoll *simple_poll;
220
sig_atomic_t quit_now = 0;
221
int signal_received = 0;
223
/* Function to use when printing errors */
224
void perror_plus(const char *print_text){
226
fprintf(stderr, "Mandos plugin %s: ",
227
program_invocation_short_name);
232
__attribute__((format (gnu_printf, 2, 3), nonnull))
233
int fprintf_plus(FILE *stream, const char *format, ...){
235
va_start (ap, format);
237
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
238
program_invocation_short_name));
239
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
243
* Make additional room in "buffer" for at least BUFFER_SIZE more
244
* bytes. "buffer_capacity" is how much is currently allocated,
131
245
* "buffer_length" is how much is already used.
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
247
__attribute__((nonnull, warn_unused_result))
248
size_t incbuffer(char **buffer, size_t buffer_length,
249
size_t buffer_capacity){
135
250
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
251
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
253
int old_errno = errno;
140
260
buffer_capacity += BUFFER_SIZE;
142
262
return buffer_capacity;
265
/* Add server to set of servers to retry periodically */
266
__attribute__((nonnull, warn_unused_result))
267
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
268
int af, server **current_server){
270
server *new_server = malloc(sizeof(server));
271
if(new_server == NULL){
272
perror_plus("malloc");
275
*new_server = (server){ .ip = strdup(ip),
277
.if_index = if_index,
279
if(new_server->ip == NULL){
280
perror_plus("strdup");
284
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
286
perror_plus("clock_gettime");
288
#pragma GCC diagnostic push
289
#pragma GCC diagnostic ignored "-Wcast-qual"
291
free((char *)(new_server->ip));
293
#pragma GCC diagnostic pop
298
/* Special case of first server */
299
if(*current_server == NULL){
300
new_server->next = new_server;
301
new_server->prev = new_server;
302
*current_server = new_server;
304
/* Place the new server last in the list */
305
new_server->next = *current_server;
306
new_server->prev = (*current_server)->prev;
307
new_server->prev->next = new_server;
308
(*current_server)->prev = new_server;
313
/* Set effective uid to 0, return errno */
314
__attribute__((warn_unused_result))
315
int raise_privileges(void){
316
int old_errno = errno;
318
if(seteuid(0) == -1){
325
/* Set effective and real user ID to 0. Return errno. */
326
__attribute__((warn_unused_result))
327
int raise_privileges_permanently(void){
328
int old_errno = errno;
329
int ret = raise_privileges();
341
/* Set effective user ID to unprivileged saved user ID */
342
__attribute__((warn_unused_result))
343
int lower_privileges(void){
344
int old_errno = errno;
346
if(seteuid(uid) == -1){
353
/* Lower privileges permanently */
354
__attribute__((warn_unused_result))
355
int lower_privileges_permanently(void){
356
int old_errno = errno;
358
if(setuid(uid) == -1){
146
366
* Initialize GPGME.
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
368
__attribute__((nonnull, warn_unused_result))
369
static bool init_gpgme(const char * const seckey,
370
const char * const pubkey,
371
const char * const tempdir,
151
373
gpgme_error_t rc;
152
374
gpgme_engine_info_t engine_info;
156
* Helper function to insert pub and seckey to the enigne keyring.
377
* Helper function to insert pub and seckey to the engine keyring.
158
bool import_key(const char *filename){
379
bool import_key(const char * const filename){
160
382
gpgme_data_t pgp_data;
162
384
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
390
/* Workaround for systems without a real-time clock; see also
391
Debian bug #894495: <https://bugs.debian.org/894495> */
394
time_t currtime = time(NULL);
395
if(currtime != (time_t)-1){
397
if(gmtime_r(&currtime, &tm) == NULL) {
398
perror_plus("gmtime_r");
401
if(tm.tm_year != 70 or tm.tm_mon != 0){
405
fprintf_plus(stderr, "System clock is January 1970");
409
fprintf_plus(stderr, "System clock is invalid");
414
ret = fstat(fd, &keystat);
416
perror_plus("fstat");
419
ret = raise_privileges();
422
perror_plus("Failed to raise privileges");
427
"Setting system clock to key file mtime");
429
if(clock_settime(CLOCK_REALTIME, &keystat.st_mtim) != 0){
430
perror_plus("clock_settime");
432
ret = lower_privileges();
435
perror_plus("Failed to lower privileges");
168
439
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
440
if(rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
441
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
442
gpgme_strsource(rc), gpgme_strerror(rc));
175
446
rc = gpgme_op_import(mc->ctx, pgp_data);
176
447
if(rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
448
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
449
gpgme_strsource(rc), gpgme_strerror(rc));
453
gpgme_import_result_t import_result
454
= gpgme_op_import_result(mc->ctx);
455
if((import_result->imported < 1
456
or import_result->not_imported > 0)
457
and import_result->unchanged == 0){
458
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
460
"The total number of considered keys: %d\n",
461
import_result->considered);
463
"The number of keys without user ID: %d\n",
464
import_result->no_user_id);
466
"The total number of imported keys: %d\n",
467
import_result->imported);
468
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
469
import_result->imported_rsa);
470
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
471
import_result->unchanged);
472
fprintf_plus(stderr, "The number of new user IDs: %d\n",
473
import_result->new_user_ids);
474
fprintf_plus(stderr, "The number of new sub keys: %d\n",
475
import_result->new_sub_keys);
476
fprintf_plus(stderr, "The number of new signatures: %d\n",
477
import_result->new_signatures);
478
fprintf_plus(stderr, "The number of new revocations: %d\n",
479
import_result->new_revocations);
481
"The total number of secret keys read: %d\n",
482
import_result->secret_read);
484
"The number of imported secret keys: %d\n",
485
import_result->secret_imported);
487
"The number of unchanged secret keys: %d\n",
488
import_result->secret_unchanged);
489
fprintf_plus(stderr, "The number of keys not imported: %d\n",
490
import_result->not_imported);
491
for(gpgme_import_status_t import_status
492
= import_result->imports;
493
import_status != NULL;
494
import_status = import_status->next){
495
fprintf_plus(stderr, "Import status for key: %s\n",
497
if(import_status->result != GPG_ERR_NO_ERROR){
498
fprintf_plus(stderr, "Import result: %s: %s\n",
499
gpgme_strsource(import_status->result),
500
gpgme_strerror(import_status->result));
502
fprintf_plus(stderr, "Key status:\n");
504
import_status->status & GPGME_IMPORT_NEW
505
? "The key was new.\n"
506
: "The key was not new.\n");
508
import_status->status & GPGME_IMPORT_UID
509
? "The key contained new user IDs.\n"
510
: "The key did not contain new user IDs.\n");
512
import_status->status & GPGME_IMPORT_SIG
513
? "The key contained new signatures.\n"
514
: "The key did not contain new signatures.\n");
516
import_status->status & GPGME_IMPORT_SUBKEY
517
? "The key contained new sub keys.\n"
518
: "The key did not contain new sub keys.\n");
520
import_status->status & GPGME_IMPORT_SECRET
521
? "The key contained a secret key.\n"
522
: "The key did not contain a secret key.\n");
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
530
perror_plus("close");
186
532
gpgme_data_release(pgp_data);
191
fprintf(stderr, "Initialize gpgme\n");
537
fprintf_plus(stderr, "Initializing GPGME\n");
195
541
gpgme_check_version(NULL);
196
542
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
543
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
544
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
203
/* Set GPGME home directory for the OpenPGP engine only */
549
/* Set GPGME home directory for the OpenPGP engine only */
204
550
rc = gpgme_get_engine_info(&engine_info);
205
551
if(rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
552
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
553
gpgme_strsource(rc), gpgme_strerror(rc));
210
556
while(engine_info != NULL){
405
752
/* OpenPGP credentials */
406
gnutls_certificate_allocate_credentials(&mc->cred);
753
ret = gnutls_certificate_allocate_credentials(&mc->cred);
407
754
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
412
safer_gnutls_strerror(ret));
413
gnutls_global_deinit();
755
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
756
safer_gnutls_strerror(ret));
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
761
fprintf_plus(stderr, "Attempting to use public key %s and"
762
" private key %s as GnuTLS credentials\n",
767
#if GNUTLS_VERSION_NUMBER >= 0x030606
768
ret = gnutls_certificate_set_rawpk_key_file
769
(mc->cred, pubkeyfilename, seckeyfilename,
770
GNUTLS_X509_FMT_PEM, /* format */
773
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
775
0, /* names_length */
777
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
778
0); /* pkcs11_flags */
779
#elif GNUTLS_VERSION_NUMBER < 0x030600
423
780
ret = gnutls_certificate_set_openpgp_key_file
424
781
(mc->cred, pubkeyfilename, seckeyfilename,
425
782
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
431
safer_gnutls_strerror(ret));
784
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
786
if(ret != GNUTLS_E_SUCCESS){
788
"Error[%d] while reading the key pair ('%s',"
789
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
790
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
791
safer_gnutls_strerror(ret));
435
795
/* GnuTLS server initialization */
436
796
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
449
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
797
if(ret != GNUTLS_E_SUCCESS){
798
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
799
" initialization: %s\n",
800
safer_gnutls_strerror(ret));
803
/* If a Diffie-Hellman parameters file was given, try to use it */
804
if(dhparamsfilename != NULL){
805
gnutls_datum_t params = { .data = NULL, .size = 0 };
807
int dhpfile = open(dhparamsfilename, O_RDONLY);
810
dhparamsfilename = NULL;
813
size_t params_capacity = 0;
815
params_capacity = incbuffer((char **)¶ms.data,
817
(size_t)params_capacity);
818
if(params_capacity == 0){
819
perror_plus("incbuffer");
822
dhparamsfilename = NULL;
825
ssize_t bytes_read = read(dhpfile,
826
params.data + params.size,
832
/* check bytes_read for failure */
837
dhparamsfilename = NULL;
840
params.size += (unsigned int)bytes_read;
842
ret = close(dhpfile);
844
perror_plus("close");
846
if(params.data == NULL){
847
dhparamsfilename = NULL;
849
if(dhparamsfilename == NULL){
852
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
853
GNUTLS_X509_FMT_PEM);
854
if(ret != GNUTLS_E_SUCCESS){
855
fprintf_plus(stderr, "Failed to parse DH parameters in file"
856
" \"%s\": %s\n", dhparamsfilename,
857
safer_gnutls_strerror(ret));
858
dhparamsfilename = NULL;
863
if(dhparamsfilename == NULL){
864
if(mc->dh_bits == 0){
865
#if GNUTLS_VERSION_NUMBER < 0x030600
866
/* Find out the optimal number of DH bits */
867
/* Try to read the private key file */
868
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
870
int secfile = open(seckeyfilename, O_RDONLY);
875
size_t buffer_capacity = 0;
877
buffer_capacity = incbuffer((char **)&buffer.data,
879
(size_t)buffer_capacity);
880
if(buffer_capacity == 0){
881
perror_plus("incbuffer");
886
ssize_t bytes_read = read(secfile,
887
buffer.data + buffer.size,
893
/* check bytes_read for failure */
900
buffer.size += (unsigned int)bytes_read;
904
/* If successful, use buffer to parse private key */
905
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
906
if(buffer.data != NULL){
908
gnutls_openpgp_privkey_t privkey = NULL;
909
ret = gnutls_openpgp_privkey_init(&privkey);
910
if(ret != GNUTLS_E_SUCCESS){
911
fprintf_plus(stderr, "Error initializing OpenPGP key"
913
safer_gnutls_strerror(ret));
917
ret = gnutls_openpgp_privkey_import
918
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
919
if(ret != GNUTLS_E_SUCCESS){
920
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
921
safer_gnutls_strerror(ret));
927
/* Use private key to suggest an appropriate
929
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
930
gnutls_openpgp_privkey_deinit(privkey);
932
fprintf_plus(stderr, "This OpenPGP key implies using"
933
" a GnuTLS security parameter \"%s\".\n",
934
safe_string(gnutls_sec_param_get_name
940
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
941
/* Err on the side of caution */
942
sec_param = GNUTLS_SEC_PARAM_ULTRA;
944
fprintf_plus(stderr, "Falling back to security parameter"
946
safe_string(gnutls_sec_param_get_name
951
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
955
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
956
" implies %u DH bits; using that.\n",
957
safe_string(gnutls_sec_param_get_name
962
fprintf_plus(stderr, "Failed to get implied number of DH"
963
" bits for security parameter \"%s\"): %s\n",
964
safe_string(gnutls_sec_param_get_name
966
safer_gnutls_strerror(ret));
970
} else { /* dh_bits != 0 */
972
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
975
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
976
if(ret != GNUTLS_E_SUCCESS){
977
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
978
" bits): %s\n", mc->dh_bits,
979
safer_gnutls_strerror(ret));
982
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
455
990
gnutls_certificate_free_credentials(mc->cred);
456
gnutls_global_deinit();
457
991
gnutls_dh_params_deinit(mc->dh_params);
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
995
__attribute__((nonnull, warn_unused_result))
996
static int init_gnutls_session(gnutls_session_t *session,
464
999
/* GnuTLS session creation */
465
ret = gnutls_init(session, GNUTLS_SERVER);
1001
ret = gnutls_init(session, (GNUTLS_SERVER
1002
#if GNUTLS_VERSION_NUMBER >= 0x030506
1005
#if GNUTLS_VERSION_NUMBER >= 0x030606
1006
| GNUTLS_ENABLE_RAWPK
1012
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
466
1013
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
safer_gnutls_strerror(ret));
1014
fprintf_plus(stderr,
1015
"Error in GnuTLS session initialization: %s\n",
1016
safer_gnutls_strerror(ret));
472
1020
const char *err;
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
475
fprintf(stderr, "Syntax error at: %s\n", err);
476
fprintf(stderr, "GnuTLS error: %s\n",
477
safer_gnutls_strerror(ret));
1022
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
1024
gnutls_deinit(*session);
1027
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
1028
if(ret != GNUTLS_E_SUCCESS){
1029
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1030
fprintf_plus(stderr, "GnuTLS error: %s\n",
1031
safer_gnutls_strerror(ret));
478
1032
gnutls_deinit(*session);
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
485
if(ret != GNUTLS_E_SUCCESS) {
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
safer_gnutls_strerror(ret));
1038
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1041
gnutls_deinit(*session);
1044
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
1045
if(ret != GNUTLS_E_SUCCESS){
1046
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1047
safer_gnutls_strerror(ret));
488
1048
gnutls_deinit(*session);
492
1052
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
1053
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
502
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
503
1060
__attribute__((unused)) const char *txt){}
1062
/* Helper function to add_local_route() and delete_local_route() */
1063
__attribute__((nonnull, warn_unused_result))
1064
static bool add_delete_local_route(const bool add,
1065
const char *address,
1066
AvahiIfIndex if_index){
1068
char helper[] = "mandos-client-iprouteadddel";
1069
char add_arg[] = "add";
1070
char delete_arg[] = "delete";
1071
char debug_flag[] = "--debug";
1072
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1073
if(pluginhelperdir == NULL){
1075
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1076
" variable not set; cannot run helper\n");
1081
char interface[IF_NAMESIZE];
1082
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1083
perror_plus("if_indextoname");
1087
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1089
perror_plus("open(\"/dev/null\", O_RDONLY)");
1095
/* Raise privileges */
1096
errno = raise_privileges_permanently();
1098
perror_plus("Failed to raise privileges");
1099
/* _exit(EX_NOPERM); */
1105
perror_plus("setgid");
1109
/* Reset supplementary groups */
1111
ret = setgroups(0, NULL);
1113
perror_plus("setgroups");
1118
ret = dup2(devnull, STDIN_FILENO);
1120
perror_plus("dup2(devnull, STDIN_FILENO)");
1124
ret = close(devnull);
1126
perror_plus("close");
1128
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1130
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1133
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1138
if(helperdir_fd == -1){
1139
perror_plus("open");
1140
_exit(EX_UNAVAILABLE);
1142
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1144
if(helper_fd == -1){
1145
perror_plus("openat");
1146
close(helperdir_fd);
1147
_exit(EX_UNAVAILABLE);
1149
close(helperdir_fd);
1151
#pragma GCC diagnostic push
1152
#pragma GCC diagnostic ignored "-Wcast-qual"
1154
if(fexecve(helper_fd, (char *const [])
1155
{ helper, add ? add_arg : delete_arg, (char *)address,
1156
interface, debug ? debug_flag : NULL, NULL },
1159
#pragma GCC diagnostic pop
1161
perror_plus("fexecve");
1162
_exit(EXIT_FAILURE);
1166
perror_plus("fork");
1170
ret = close(devnull);
1172
perror_plus("close");
1178
pret = waitpid(pid, &status, 0);
1179
if(pret == -1 and errno == EINTR and quit_now){
1180
int errno_raising = 0;
1181
if((errno = raise_privileges()) != 0){
1182
errno_raising = errno;
1183
perror_plus("Failed to raise privileges in order to"
1184
" kill helper program");
1186
if(kill(pid, SIGTERM) == -1){
1187
perror_plus("kill");
1189
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1190
perror_plus("Failed to lower privileges after killing"
1195
} while(pret == -1 and errno == EINTR);
1197
perror_plus("waitpid");
1200
if(WIFEXITED(status)){
1201
if(WEXITSTATUS(status) != 0){
1202
fprintf_plus(stderr, "Error: iprouteadddel exited"
1203
" with status %d\n", WEXITSTATUS(status));
1208
if(WIFSIGNALED(status)){
1209
fprintf_plus(stderr, "Error: iprouteadddel died by"
1210
" signal %d\n", WTERMSIG(status));
1213
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1217
__attribute__((nonnull, warn_unused_result))
1218
static bool add_local_route(const char *address,
1219
AvahiIfIndex if_index){
1221
fprintf_plus(stderr, "Adding route to %s\n", address);
1223
return add_delete_local_route(true, address, if_index);
1226
__attribute__((nonnull, warn_unused_result))
1227
static bool delete_local_route(const char *address,
1228
AvahiIfIndex if_index){
1230
fprintf_plus(stderr, "Removing route to %s\n", address);
1232
return add_delete_local_route(false, address, if_index);
505
1235
/* Called when a Mandos server is found */
506
static int start_mandos_communication(const char *ip, uint16_t port,
1236
__attribute__((nonnull, warn_unused_result))
1237
static int start_mandos_communication(const char *ip, in_port_t port,
507
1238
AvahiIfIndex if_index,
1239
int af, mandos_context *mc){
1240
int ret, tcp_sd = -1;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1242
struct sockaddr_storage to;
512
1243
char *buffer = NULL;
513
char *decrypted_buffer;
1244
char *decrypted_buffer = NULL;
514
1245
size_t buffer_length = 0;
515
1246
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
519
char interface[IF_NAMESIZE];
520
1249
gnutls_session_t session;
522
ret = init_gnutls_session(mc, &session);
1250
int pf; /* Protocol family */
1251
bool route_added = false;
1268
fprintf_plus(stderr, "Bad address family: %d\n", af);
1273
/* If the interface is specified and we have a list of interfaces */
1274
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1275
/* Check if the interface is one of the interfaces we are using */
1278
char *interface = NULL;
1279
while((interface = argz_next(mc->interfaces,
1280
mc->interfaces_size,
1282
if(if_nametoindex(interface) == (unsigned int)if_index){
1289
/* This interface does not match any in the list, so we don't
1290
connect to the server */
1292
char interface[IF_NAMESIZE];
1293
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1294
perror_plus("if_indextoname");
1296
fprintf_plus(stderr, "Skipping server on non-used interface"
1298
if_indextoname((unsigned int)if_index,
1306
ret = init_gnutls_session(&session, mc);
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
543
fprintf(stderr, "Binding to interface %s\n", interface);
546
memset(&to, 0, sizeof(to));
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1312
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1313
PRIuMAX "\n", ip, (uintmax_t)port);
1316
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1319
perror_plus("socket");
1330
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1331
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1332
ret = inet_pton(af, ip, &to6->sin6_addr);
1334
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1335
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1336
ret = inet_pton(af, ip, &to4->sin_addr);
1340
perror_plus("inet_pton");
556
fprintf(stderr, "Bad address: %s\n", ip);
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wunreachable-code */
1346
fprintf_plus(stderr, "Bad address: %s\n", ip);
1351
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1352
if(IN6_IS_ADDR_LINKLOCAL
1353
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1354
if(if_index == AVAHI_IF_UNSPEC){
1355
fprintf_plus(stderr, "An IPv6 link-local address is"
1356
" incomplete without a network interface\n");
1360
/* Set the network interface number as scope */
1361
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1364
((struct sockaddr_in *)&to)->sin_port = htons(port);
563
to.in6.sin6_scope_id = (uint32_t)if_index;
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
573
if(strcmp(addrstr, ip) != 0){
574
fprintf(stderr, "Canonical address form: %s\n", addrstr);
579
ret = connect(tcp_sd, &to.in, sizeof(to));
1373
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1374
char interface[IF_NAMESIZE];
1375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1376
perror_plus("if_indextoname");
1378
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1379
"\n", ip, interface, (uintmax_t)port);
1382
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1383
ip, (uintmax_t)port);
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1388
ret = getnameinfo((struct sockaddr *)&to,
1389
sizeof(struct sockaddr_in6),
1390
addrstr, sizeof(addrstr), NULL, 0,
1393
ret = getnameinfo((struct sockaddr *)&to,
1394
sizeof(struct sockaddr_in),
1395
addrstr, sizeof(addrstr), NULL, 0,
1398
if(ret == EAI_SYSTEM){
1399
perror_plus("getnameinfo");
1400
} else if(ret != 0) {
1401
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1402
} else if(strcmp(addrstr, ip) != 0){
1403
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1414
ret = connect(tcp_sd, (struct sockaddr *)&to,
1415
sizeof(struct sockaddr_in6));
1417
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1418
sizeof(struct sockaddr_in));
1421
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1422
and if_index != AVAHI_IF_UNSPEC
1423
and connect_to == NULL
1424
and not route_added and
1425
((af == AF_INET6 and not
1426
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1428
or (af == AF_INET and
1429
/* Not a a IPv4LL address */
1430
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1431
& 0xFFFF0000L) != 0xA9FE0000L))){
1432
/* Work around Avahi bug - Avahi does not announce link-local
1433
addresses if it has a global address, so local hosts with
1434
*only* a link-local address (e.g. Mandos clients) cannot
1435
connect to a Mandos server announced by Avahi on a server
1436
host with a global address. Work around this by retrying
1437
with an explicit route added with the server's address.
1439
Avahi bug reference:
1440
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1441
https://bugs.debian.org/587961
1444
fprintf_plus(stderr, "Mandos server unreachable, trying"
1448
route_added = add_local_route(ip, if_index);
1454
if(errno != ECONNREFUSED or debug){
1456
perror_plus("connect");
585
1469
const char *out = mandos_protocol_version;
811
1808
case AVAHI_BROWSER_ALL_FOR_NOW:
812
1809
case AVAHI_BROWSER_CACHE_EXHAUSTED:
814
fprintf(stderr, "No Mandos server found, still searching...\n");
1811
fprintf_plus(stderr, "No Mandos server found, still"
1818
/* Signal handler that stops main loop after SIGTERM */
1819
static void handle_sigterm(int sig){
1824
signal_received = sig;
1825
int old_errno = errno;
1826
/* set main loop to exit */
1827
if(simple_poll != NULL){
1828
avahi_simple_poll_quit(simple_poll);
1833
__attribute__((nonnull, warn_unused_result))
1834
bool get_flags(const char *ifname, struct ifreq *ifr){
1838
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1841
perror_plus("socket");
1845
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1846
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1847
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1851
perror_plus("ioctl SIOCGIFFLAGS");
1854
if((close(s) == -1) and debug){
1856
perror_plus("close");
1861
if((close(s) == -1) and debug){
1863
perror_plus("close");
1869
__attribute__((nonnull, warn_unused_result))
1870
bool good_flags(const char *ifname, const struct ifreq *ifr){
1872
/* Reject the loopback device */
1873
if(ifr->ifr_flags & IFF_LOOPBACK){
1875
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1880
/* Accept point-to-point devices only if connect_to is specified */
1881
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1883
fprintf_plus(stderr, "Accepting point-to-point interface"
1884
" \"%s\"\n", ifname);
1888
/* Otherwise, reject non-broadcast-capable devices */
1889
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1891
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1892
" \"%s\"\n", ifname);
1896
/* Reject non-ARP interfaces (including dummy interfaces) */
1897
if(ifr->ifr_flags & IFF_NOARP){
1899
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1905
/* Accept this device */
1907
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1913
* This function determines if a directory entry in /sys/class/net
1914
* corresponds to an acceptable network device.
1915
* (This function is passed to scandir(3) as a filter function.)
1917
__attribute__((nonnull, warn_unused_result))
1918
int good_interface(const struct dirent *if_entry){
1919
if(if_entry->d_name[0] == '.'){
1924
if(not get_flags(if_entry->d_name, &ifr)){
1926
fprintf_plus(stderr, "Failed to get flags for interface "
1927
"\"%s\"\n", if_entry->d_name);
1932
if(not good_flags(if_entry->d_name, &ifr)){
1939
* This function determines if a network interface is up.
1941
__attribute__((nonnull, warn_unused_result))
1942
bool interface_is_up(const char *interface){
1944
if(not get_flags(interface, &ifr)){
1946
fprintf_plus(stderr, "Failed to get flags for interface "
1947
"\"%s\"\n", interface);
1952
return (bool)(ifr.ifr_flags & IFF_UP);
1956
* This function determines if a network interface is running
1958
__attribute__((nonnull, warn_unused_result))
1959
bool interface_is_running(const char *interface){
1961
if(not get_flags(interface, &ifr)){
1963
fprintf_plus(stderr, "Failed to get flags for interface "
1964
"\"%s\"\n", interface);
1969
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1972
__attribute__((nonnull, pure, warn_unused_result))
1973
int notdotentries(const struct dirent *direntry){
1974
/* Skip "." and ".." */
1975
if(direntry->d_name[0] == '.'
1976
and (direntry->d_name[1] == '\0'
1977
or (direntry->d_name[1] == '.'
1978
and direntry->d_name[2] == '\0'))){
1984
/* Is this directory entry a runnable program? */
1985
__attribute__((nonnull, warn_unused_result))
1986
int runnable_hook(const struct dirent *direntry){
1991
if((direntry->d_name)[0] == '\0'){
1996
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1997
"abcdefghijklmnopqrstuvwxyz"
2000
if((direntry->d_name)[sret] != '\0'){
2001
/* Contains non-allowed characters */
2003
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
2009
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
2012
perror_plus("Could not stat hook");
2016
if(not (S_ISREG(st.st_mode))){
2017
/* Not a regular file */
2019
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
2024
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
2025
/* Not executable */
2027
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
2033
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2039
__attribute__((nonnull, warn_unused_result))
2040
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2041
mandos_context *mc){
2043
struct timespec now;
2044
struct timespec waited_time;
2045
intmax_t block_time;
2048
if(mc->current_server == NULL){
2050
fprintf_plus(stderr, "Wait until first server is found."
2053
ret = avahi_simple_poll_iterate(s, -1);
2056
fprintf_plus(stderr, "Check current_server if we should run"
2059
/* the current time */
2060
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2062
perror_plus("clock_gettime");
2065
/* Calculating in ms how long time between now and server
2066
who we visted longest time ago. Now - last seen. */
2067
waited_time.tv_sec = (now.tv_sec
2068
- mc->current_server->last_seen.tv_sec);
2069
waited_time.tv_nsec = (now.tv_nsec
2070
- mc->current_server->last_seen.tv_nsec);
2071
/* total time is 10s/10,000ms.
2072
Converting to s from ms by dividing by 1,000,
2073
and ns to ms by dividing by 1,000,000. */
2074
block_time = ((retry_interval
2075
- ((intmax_t)waited_time.tv_sec * 1000))
2076
- ((intmax_t)waited_time.tv_nsec / 1000000));
2079
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2083
if(block_time <= 0){
2084
ret = start_mandos_communication(mc->current_server->ip,
2085
mc->current_server->port,
2086
mc->current_server->if_index,
2087
mc->current_server->af, mc);
2089
avahi_simple_poll_quit(s);
2092
ret = clock_gettime(CLOCK_MONOTONIC,
2093
&mc->current_server->last_seen);
2095
perror_plus("clock_gettime");
2098
mc->current_server = mc->current_server->next;
2099
block_time = 0; /* Call avahi to find new Mandos
2100
servers, but don't block */
2103
ret = avahi_simple_poll_iterate(s, (int)block_time);
2106
if(ret > 0 or errno != EINTR){
2107
return (ret != 1) ? ret : 0;
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
2116
struct dirent **direntries = NULL;
2117
if(hookdir_fd == -1){
2118
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2120
if(hookdir_fd == -1){
2121
if(errno == ENOENT){
2123
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2124
" found\n", hookdir);
2127
perror_plus("open");
2132
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2134
perror_plus("open(\"/dev/null\", O_RDONLY)");
2137
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2138
runnable_hook, alphasort);
2140
perror_plus("scandir");
2144
struct dirent *direntry;
2146
for(int i = 0; i < numhooks; i++){
2147
direntry = direntries[i];
2149
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2152
pid_t hook_pid = fork();
2155
/* Raise privileges */
2156
errno = raise_privileges_permanently();
2158
perror_plus("Failed to raise privileges");
2165
perror_plus("setgid");
2168
/* Reset supplementary groups */
2170
ret = setgroups(0, NULL);
2172
perror_plus("setgroups");
2175
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2177
perror_plus("setenv");
2180
ret = setenv("DEVICE", interface, 1);
2182
perror_plus("setenv");
2185
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2187
perror_plus("setenv");
2190
ret = setenv("MODE", mode, 1);
2192
perror_plus("setenv");
2196
ret = asprintf(&delaystring, "%f", (double)delay);
2198
perror_plus("asprintf");
2201
ret = setenv("DELAY", delaystring, 1);
2204
perror_plus("setenv");
2208
if(connect_to != NULL){
2209
ret = setenv("CONNECT", connect_to, 1);
2211
perror_plus("setenv");
2215
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2219
perror_plus("openat");
2220
_exit(EXIT_FAILURE);
2222
if(close(hookdir_fd) == -1){
2223
perror_plus("close");
2224
_exit(EXIT_FAILURE);
2226
ret = dup2(devnull, STDIN_FILENO);
2228
perror_plus("dup2(devnull, STDIN_FILENO)");
2231
ret = close(devnull);
2233
perror_plus("close");
2236
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2238
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2241
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2243
perror_plus("fexecve");
2244
_exit(EXIT_FAILURE);
2248
perror_plus("fork");
2253
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2254
perror_plus("waitpid");
2258
if(WIFEXITED(status)){
2259
if(WEXITSTATUS(status) != 0){
2260
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2261
" with status %d\n", direntry->d_name,
2262
WEXITSTATUS(status));
2266
} else if(WIFSIGNALED(status)){
2267
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2268
" signal %d\n", direntry->d_name,
2273
fprintf_plus(stderr, "Warning: network hook \"%s\""
2274
" crashed\n", direntry->d_name);
2280
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2286
if(close(hookdir_fd) == -1){
2287
perror_plus("close");
2294
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2297
int old_errno = errno;
2299
struct ifreq network;
2300
unsigned int if_index = if_nametoindex(interface);
2302
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2312
if(not interface_is_up(interface)){
2314
int ioctl_errno = 0;
2315
if(not get_flags(interface, &network)){
2317
fprintf_plus(stderr, "Failed to get flags for interface "
2318
"\"%s\"\n", interface);
2322
network.ifr_flags |= IFF_UP; /* set flag */
2324
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2327
perror_plus("socket");
2335
perror_plus("close");
2342
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2346
/* Raise privileges */
2347
ret_errno = raise_privileges();
2350
perror_plus("Failed to raise privileges");
2355
bool restore_loglevel = false;
2357
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2358
messages about the network interface to mess up the prompt */
2359
ret_linux = klogctl(8, NULL, 5);
2360
if(ret_linux == -1){
2361
perror_plus("klogctl");
2363
restore_loglevel = true;
2366
#endif /* __linux__ */
2367
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2368
ioctl_errno = errno;
2370
if(restore_loglevel){
2371
ret_linux = klogctl(7, NULL, 0);
2372
if(ret_linux == -1){
2373
perror_plus("klogctl");
2376
#endif /* __linux__ */
2378
/* If raise_privileges() succeeded above */
2380
/* Lower privileges */
2381
ret_errno = lower_privileges();
2384
perror_plus("Failed to lower privileges");
2388
/* Close the socket */
2391
perror_plus("close");
2394
if(ret_setflags == -1){
2395
errno = ioctl_errno;
2396
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2401
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2405
/* Sleep checking until interface is running.
2406
Check every 0.25s, up to total time of delay */
2407
for(int i = 0; i < delay * 4; i++){
2408
if(interface_is_running(interface)){
2411
struct timespec sleeptime = { .tv_nsec = 250000000 };
2412
ret = nanosleep(&sleeptime, NULL);
2413
if(ret == -1 and errno != EINTR){
2414
perror_plus("nanosleep");
2422
__attribute__((nonnull, warn_unused_result))
2423
int take_down_interface(const char *const interface){
2424
int old_errno = errno;
2425
struct ifreq network;
2426
unsigned int if_index = if_nametoindex(interface);
2428
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2432
if(interface_is_up(interface)){
2434
int ioctl_errno = 0;
2435
if(not get_flags(interface, &network) and debug){
2437
fprintf_plus(stderr, "Failed to get flags for interface "
2438
"\"%s\"\n", interface);
2442
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2444
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2447
perror_plus("socket");
2453
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2457
/* Raise privileges */
2458
ret_errno = raise_privileges();
2461
perror_plus("Failed to raise privileges");
2464
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2465
ioctl_errno = errno;
2467
/* If raise_privileges() succeeded above */
2469
/* Lower privileges */
2470
ret_errno = lower_privileges();
2473
perror_plus("Failed to lower privileges");
2477
/* Close the socket */
2478
int ret = close(sd);
2480
perror_plus("close");
2483
if(ret_setflags == -1){
2484
errno = ioctl_errno;
2485
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2490
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
820
2498
int main(int argc, char *argv[]){
821
AvahiSServiceBrowser *sb = NULL;
824
int exitcode = EXIT_SUCCESS;
825
const char *interface = "eth0";
826
struct ifreq network;
830
char *connect_to = NULL;
831
char tempdir[] = "/tmp/mandosXXXXXX";
832
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
833
const char *seckey = PATHDIR "/" SECKEY;
834
const char *pubkey = PATHDIR "/" PUBKEY;
836
mandos_context mc = { .simple_poll = NULL, .server = NULL,
837
.dh_bits = 1024, .priority = "SECURE256"
838
":!CTYPE-X.509:+CTYPE-OPENPGP" };
839
bool gnutls_initalized = false;
840
bool gpgme_initalized = false;
843
struct argp_option options[] = {
844
{ .name = "debug", .key = 128,
845
.doc = "Debug mode", .group = 3 },
846
{ .name = "connect", .key = 'c',
847
.arg = "ADDRESS:PORT",
848
.doc = "Connect directly to a specific Mandos server",
850
{ .name = "interface", .key = 'i',
852
.doc = "Interface that will be used to search for Mandos"
855
{ .name = "seckey", .key = 's',
857
.doc = "OpenPGP secret key file base name",
859
{ .name = "pubkey", .key = 'p',
861
.doc = "OpenPGP public key file base name",
863
{ .name = "dh-bits", .key = 129,
865
.doc = "Bit length of the prime number used in the"
866
" Diffie-Hellman key exchange",
868
{ .name = "priority", .key = 130,
870
.doc = "GnuTLS priority string for the TLS handshake",
875
error_t parse_opt(int key, char *arg,
876
struct argp_state *state) {
878
case 128: /* --debug */
881
case 'c': /* --connect */
884
case 'i': /* --interface */
887
case 's': /* --seckey */
890
case 'p': /* --pubkey */
893
case 129: /* --dh-bits */
894
ret = sscanf(arg, "%u", &mc.dh_bits);
896
fprintf(stderr, "Bad number of DH bits\n");
900
case 130: /* --priority */
908
return ARGP_ERR_UNKNOWN;
913
struct argp argp = { .options = options, .parser = parse_opt,
915
.doc = "Mandos client -- Get and decrypt"
916
" passwords from a Mandos server" };
917
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
918
if(ret == ARGP_ERR_UNKNOWN){
919
fprintf(stderr, "Unknown error while parsing arguments\n");
920
exitcode = EXIT_FAILURE;
925
/* If the interface is down, bring it up */
927
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
930
exitcode = EXIT_FAILURE;
933
strcpy(network.ifr_name, interface);
934
ret = ioctl(sd, SIOCGIFFLAGS, &network);
936
perror("ioctl SIOCGIFFLAGS");
937
exitcode = EXIT_FAILURE;
940
if((network.ifr_flags & IFF_UP) == 0){
941
network.ifr_flags |= IFF_UP;
942
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2499
mandos_context mc = { .server = NULL, .dh_bits = 0,
2500
#if GNUTLS_VERSION_NUMBER >= 0x030606
2501
.priority = "SECURE128:!CTYPE-X.509"
2502
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2504
#elif GNUTLS_VERSION_NUMBER < 0x030600
2505
.priority = "SECURE256:!CTYPE-X.509"
2506
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2508
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2510
.current_server = NULL, .interfaces = NULL,
2511
.interfaces_size = 0 };
2512
AvahiSServiceBrowser *sb = NULL;
2517
int exitcode = EXIT_SUCCESS;
2518
char *interfaces_to_take_down = NULL;
2519
size_t interfaces_to_take_down_size = 0;
2520
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2521
char old_tempdir[] = "/tmp/mandosXXXXXX";
2522
char *tempdir = NULL;
2523
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2524
const char *seckey = PATHDIR "/" SECKEY;
2525
const char *pubkey = PATHDIR "/" PUBKEY;
2526
#if GNUTLS_VERSION_NUMBER >= 0x030606
2527
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2528
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2530
const char *dh_params_file = NULL;
2531
char *interfaces_hooks = NULL;
2533
bool gnutls_initialized = false;
2534
bool gpgme_initialized = false;
2536
double retry_interval = 10; /* 10s between trying a server and
2537
retrying the same server again */
2539
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2540
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2545
/* Lower any group privileges we might have, just to be safe */
2549
perror_plus("setgid");
2552
/* Lower user privileges (temporarily) */
2556
perror_plus("seteuid");
2564
struct argp_option options[] = {
2565
{ .name = "debug", .key = 128,
2566
.doc = "Debug mode", .group = 3 },
2567
{ .name = "connect", .key = 'c',
2568
.arg = "ADDRESS:PORT",
2569
.doc = "Connect directly to a specific Mandos server",
2571
{ .name = "interface", .key = 'i',
2573
.doc = "Network interface that will be used to search for"
2576
{ .name = "seckey", .key = 's',
2578
.doc = "OpenPGP secret key file base name",
2580
{ .name = "pubkey", .key = 'p',
2582
.doc = "OpenPGP public key file base name",
2584
{ .name = "tls-privkey", .key = 't',
2586
#if GNUTLS_VERSION_NUMBER >= 0x030606
2587
.doc = "TLS private key file base name",
2589
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2592
{ .name = "tls-pubkey", .key = 'T',
2594
#if GNUTLS_VERSION_NUMBER >= 0x030606
2595
.doc = "TLS public key file base name",
2597
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2600
{ .name = "dh-bits", .key = 129,
2602
.doc = "Bit length of the prime number used in the"
2603
" Diffie-Hellman key exchange",
2605
{ .name = "dh-params", .key = 134,
2607
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2608
" for the Diffie-Hellman key exchange",
2610
{ .name = "priority", .key = 130,
2612
.doc = "GnuTLS priority string for the TLS handshake",
2614
{ .name = "delay", .key = 131,
2616
.doc = "Maximum delay to wait for interface startup",
2618
{ .name = "retry", .key = 132,
2620
.doc = "Retry interval used when denied by the Mandos server",
2622
{ .name = "network-hook-dir", .key = 133,
2624
.doc = "Directory where network hooks are located",
2627
* These reproduce what we would get without ARGP_NO_HELP
2629
{ .name = "help", .key = '?',
2630
.doc = "Give this help list", .group = -1 },
2631
{ .name = "usage", .key = -3,
2632
.doc = "Give a short usage message", .group = -1 },
2633
{ .name = "version", .key = 'V',
2634
.doc = "Print program version", .group = -1 },
2638
error_t parse_opt(int key, char *arg,
2639
struct argp_state *state){
2642
case 128: /* --debug */
2645
case 'c': /* --connect */
2648
case 'i': /* --interface */
2649
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2652
argp_error(state, "%s", strerror(ret_errno));
2655
case 's': /* --seckey */
2658
case 'p': /* --pubkey */
2661
case 't': /* --tls-privkey */
2662
#if GNUTLS_VERSION_NUMBER >= 0x030606
2666
case 'T': /* --tls-pubkey */
2667
#if GNUTLS_VERSION_NUMBER >= 0x030606
2671
case 129: /* --dh-bits */
2673
tmpmax = strtoimax(arg, &tmp, 10);
2674
if(errno != 0 or tmp == arg or *tmp != '\0'
2675
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2676
argp_error(state, "Bad number of DH bits");
2678
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2680
case 134: /* --dh-params */
2681
dh_params_file = arg;
2683
case 130: /* --priority */
2686
case 131: /* --delay */
2688
delay = strtof(arg, &tmp);
2689
if(errno != 0 or tmp == arg or *tmp != '\0'){
2690
argp_error(state, "Bad delay");
2692
case 132: /* --retry */
2694
retry_interval = strtod(arg, &tmp);
2695
if(errno != 0 or tmp == arg or *tmp != '\0'
2696
or (retry_interval * 1000) > INT_MAX
2697
or retry_interval < 0){
2698
argp_error(state, "Bad retry interval");
2701
case 133: /* --network-hook-dir */
2705
* These reproduce what we would get without ARGP_NO_HELP
2707
case '?': /* --help */
2708
argp_state_help(state, state->out_stream,
2709
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2710
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2711
__builtin_unreachable();
2712
case -3: /* --usage */
2713
argp_state_help(state, state->out_stream,
2714
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2715
__builtin_unreachable();
2716
case 'V': /* --version */
2717
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2718
exit(argp_err_exit_status);
2721
return ARGP_ERR_UNKNOWN;
2726
struct argp argp = { .options = options, .parser = parse_opt,
2728
.doc = "Mandos client -- Get and decrypt"
2729
" passwords from a Mandos server" };
2730
ret_errno = argp_parse(&argp, argc, argv,
2731
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2738
perror_plus("argp_parse");
2739
exitcode = EX_OSERR;
2742
exitcode = EX_USAGE;
2748
/* Re-raise privileges */
2749
ret = raise_privileges();
2752
perror_plus("Failed to raise privileges");
2756
/* Work around Debian bug #633582:
2757
<https://bugs.debian.org/633582> */
2759
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2760
int seckey_fd = open(seckey, O_RDONLY);
2761
if(seckey_fd == -1){
2762
perror_plus("open");
2764
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2766
perror_plus("fstat");
2768
if(S_ISREG(st.st_mode)
2769
and st.st_uid == 0 and st.st_gid == 0){
2770
ret = fchown(seckey_fd, uid, gid);
2772
perror_plus("fchown");
2780
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2781
int pubkey_fd = open(pubkey, O_RDONLY);
2782
if(pubkey_fd == -1){
2783
perror_plus("open");
2785
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2787
perror_plus("fstat");
2789
if(S_ISREG(st.st_mode)
2790
and st.st_uid == 0 and st.st_gid == 0){
2791
ret = fchown(pubkey_fd, uid, gid);
2793
perror_plus("fchown");
2801
if(dh_params_file != NULL
2802
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2803
int dhparams_fd = open(dh_params_file, O_RDONLY);
2804
if(dhparams_fd == -1){
2805
perror_plus("open");
2807
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2809
perror_plus("fstat");
2811
if(S_ISREG(st.st_mode)
2812
and st.st_uid == 0 and st.st_gid == 0){
2813
ret = fchown(dhparams_fd, uid, gid);
2815
perror_plus("fchown");
2823
/* Work around Debian bug #981302
2824
<https://bugs.debian.org/981302> */
2825
if(lstat("/dev/fd", &st) != 0 and errno == ENOENT){
2826
ret = symlink("/proc/self/fd", "/dev/fd");
944
perror("ioctl SIOCSIFFLAGS");
945
exitcode = EXIT_FAILURE;
949
ret = (int)TEMP_FAILURE_RETRY(close(sd));
968
ret = init_gnutls_global(&mc, pubkey, seckey);
970
fprintf(stderr, "init_gnutls_global failed\n");
971
exitcode = EXIT_FAILURE;
974
gnutls_initalized = true;
977
if(mkdtemp(tempdir) == NULL){
983
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
984
fprintf(stderr, "gpgme_initalized failed\n");
985
exitcode = EXIT_FAILURE;
988
gpgme_initalized = true;
991
if_index = (AvahiIfIndex) if_nametoindex(interface);
993
fprintf(stderr, "No such interface: \"%s\"\n", interface);
997
if(connect_to != NULL){
998
/* Connect directly, do not use Zeroconf */
999
/* (Mainly meant for debugging) */
1000
char *address = strrchr(connect_to, ':');
1001
if(address == NULL){
1002
fprintf(stderr, "No colon in address\n");
1003
exitcode = EXIT_FAILURE;
1007
ret = sscanf(address+1, "%" SCNu16, &port);
1009
fprintf(stderr, "Bad port number\n");
1010
exitcode = EXIT_FAILURE;
1014
address = connect_to;
1015
ret = start_mandos_communication(address, port, if_index, &mc);
1017
exitcode = EXIT_FAILURE;
1019
exitcode = EXIT_SUCCESS;
1025
avahi_set_log_function(empty_log);
1028
/* Initialize the pseudo-RNG for Avahi */
1029
srand((unsigned int) time(NULL));
1031
/* Allocate main Avahi loop object */
1032
mc.simple_poll = avahi_simple_poll_new();
1033
if(mc.simple_poll == NULL) {
1034
fprintf(stderr, "Avahi: Failed to create simple poll"
1036
exitcode = EXIT_FAILURE;
1041
AvahiServerConfig config;
1042
/* Do not publish any local Zeroconf records */
1043
avahi_server_config_init(&config);
1044
config.publish_hinfo = 0;
1045
config.publish_addresses = 0;
1046
config.publish_workstation = 0;
1047
config.publish_domain = 0;
1049
/* Allocate a new server */
1050
mc.server = avahi_server_new(avahi_simple_poll_get
1051
(mc.simple_poll), &config, NULL,
1054
/* Free the Avahi configuration data */
1055
avahi_server_config_free(&config);
1058
/* Check if creating the Avahi server object succeeded */
1059
if(mc.server == NULL) {
1060
fprintf(stderr, "Failed to create Avahi server: %s\n",
1061
avahi_strerror(error));
1062
exitcode = EXIT_FAILURE;
1066
/* Create the Avahi service browser */
1067
sb = avahi_s_service_browser_new(mc.server, if_index,
1069
"_mandos._tcp", NULL, 0,
1070
browse_callback, &mc);
1072
fprintf(stderr, "Failed to create service browser: %s\n",
1073
avahi_strerror(avahi_server_errno(mc.server)));
1074
exitcode = EXIT_FAILURE;
1078
/* Run the main loop */
2828
perror_plus("Failed to create /dev/fd symlink");
2832
/* Lower privileges */
2833
ret = lower_privileges();
2836
perror_plus("Failed to lower privileges");
2841
/* Remove invalid interface names (except "none") */
2843
char *interface = NULL;
2844
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2846
if(strcmp(interface, "none") != 0
2847
and if_nametoindex(interface) == 0){
2848
if(interface[0] != '\0'){
2849
fprintf_plus(stderr, "Not using nonexisting interface"
2850
" \"%s\"\n", interface);
2852
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2858
/* Run network hooks */
2860
if(mc.interfaces != NULL){
2861
interfaces_hooks = malloc(mc.interfaces_size);
2862
if(interfaces_hooks == NULL){
2863
perror_plus("malloc");
2866
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2867
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2869
run_network_hooks("start", interfaces_hooks != NULL ?
2870
interfaces_hooks : "", delay);
2874
avahi_set_log_function(empty_log);
2877
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2878
from the signal handler */
2879
/* Initialize the pseudo-RNG for Avahi */
2880
srand((unsigned int) time(NULL));
2881
simple_poll = avahi_simple_poll_new();
2882
if(simple_poll == NULL){
2883
fprintf_plus(stderr,
2884
"Avahi: Failed to create simple poll object.\n");
2885
exitcode = EX_UNAVAILABLE;
2889
sigemptyset(&sigterm_action.sa_mask);
2890
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2892
perror_plus("sigaddset");
2893
exitcode = EX_OSERR;
2896
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2898
perror_plus("sigaddset");
2899
exitcode = EX_OSERR;
2902
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2904
perror_plus("sigaddset");
2905
exitcode = EX_OSERR;
2908
/* Need to check if the handler is SIG_IGN before handling:
2909
| [[info:libc:Initial Signal Actions]] |
2910
| [[info:libc:Basic Signal Handling]] |
2912
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2914
perror_plus("sigaction");
2917
if(old_sigterm_action.sa_handler != SIG_IGN){
2918
ret = sigaction(SIGINT, &sigterm_action, NULL);
2920
perror_plus("sigaction");
2921
exitcode = EX_OSERR;
2925
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2927
perror_plus("sigaction");
2930
if(old_sigterm_action.sa_handler != SIG_IGN){
2931
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2933
perror_plus("sigaction");
2934
exitcode = EX_OSERR;
2938
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2940
perror_plus("sigaction");
2943
if(old_sigterm_action.sa_handler != SIG_IGN){
2944
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2946
perror_plus("sigaction");
2947
exitcode = EX_OSERR;
2952
/* If no interfaces were specified, make a list */
2953
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2955
/* Look for any good interfaces */
2956
ret = scandir(sys_class_net, &direntries, good_interface,
2959
/* Add all found interfaces to interfaces list */
2960
for(int i = 0; i < ret; ++i){
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2962
direntries[i]->d_name);
2965
perror_plus("argz_add");
2966
free(direntries[i]);
2970
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2971
direntries[i]->d_name);
2973
free(direntries[i]);
2980
fprintf_plus(stderr, "Could not find a network interface\n");
2981
exitcode = EXIT_FAILURE;
2986
/* Bring up interfaces which are down, and remove any "none"s */
2988
char *interface = NULL;
2989
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2991
/* If interface name is "none", stop bringing up interfaces.
2992
Also remove all instances of "none" from the list */
2993
if(strcmp(interface, "none") == 0){
2994
argz_delete(&mc.interfaces, &mc.interfaces_size,
2997
while((interface = argz_next(mc.interfaces,
2998
mc.interfaces_size, interface))){
2999
if(strcmp(interface, "none") == 0){
3000
argz_delete(&mc.interfaces, &mc.interfaces_size,
3007
bool interface_was_up = interface_is_up(interface);
3008
errno = bring_up_interface(interface, delay);
3009
if(not interface_was_up){
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
3014
errno = argz_add(&interfaces_to_take_down,
3015
&interfaces_to_take_down_size,
3018
perror_plus("argz_add");
3023
if(debug and (interfaces_to_take_down == NULL)){
3024
fprintf_plus(stderr, "No interfaces were brought up\n");
3028
/* If we only got one interface, explicitly use only that one */
3029
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
1081
fprintf(stderr, "Starting Avahi loop search\n");
1084
avahi_simple_poll_loop(mc.simple_poll);
3031
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3034
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3041
#if GNUTLS_VERSION_NUMBER >= 0x030606
3042
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3043
#elif GNUTLS_VERSION_NUMBER < 0x030600
3044
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3046
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
3050
exitcode = EX_UNAVAILABLE;
3053
gnutls_initialized = true;
3060
/* Try /run/tmp before /tmp */
3061
tempdir = mkdtemp(run_tempdir);
3062
if(tempdir == NULL and errno == ENOENT){
3064
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3065
run_tempdir, old_tempdir);
3067
tempdir = mkdtemp(old_tempdir);
3069
if(tempdir == NULL){
3070
perror_plus("mkdtemp");
3078
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3079
fprintf_plus(stderr, "init_gpgme failed\n");
3080
exitcode = EX_UNAVAILABLE;
3083
gpgme_initialized = true;
3090
if(connect_to != NULL){
3091
/* Connect directly, do not use Zeroconf */
3092
/* (Mainly meant for debugging) */
3093
char *address = strrchr(connect_to, ':');
3095
if(address == NULL){
3096
fprintf_plus(stderr, "No colon in address\n");
3097
exitcode = EX_USAGE;
3107
tmpmax = strtoimax(address+1, &tmp, 10);
3108
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3109
or tmpmax != (in_port_t)tmpmax){
3110
fprintf_plus(stderr, "Bad port number\n");
3111
exitcode = EX_USAGE;
3119
port = (in_port_t)tmpmax;
3121
/* Colon in address indicates IPv6 */
3123
if(strchr(connect_to, ':') != NULL){
3125
/* Accept [] around IPv6 address - see RFC 5952 */
3126
if(connect_to[0] == '[' and address[-1] == ']')
3134
address = connect_to;
3140
while(not quit_now){
3141
ret = start_mandos_communication(address, port, if_index, af,
3143
if(quit_now or ret == 0){
3147
fprintf_plus(stderr, "Retrying in %d seconds\n",
3148
(int)retry_interval);
3150
sleep((unsigned int)retry_interval);
3154
exitcode = EXIT_SUCCESS;
3165
AvahiServerConfig config;
3166
/* Do not publish any local Zeroconf records */
3167
avahi_server_config_init(&config);
3168
config.publish_hinfo = 0;
3169
config.publish_addresses = 0;
3170
config.publish_workstation = 0;
3171
config.publish_domain = 0;
3173
/* Allocate a new server */
3174
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3175
&config, NULL, NULL, &ret);
3177
/* Free the Avahi configuration data */
3178
avahi_server_config_free(&config);
3181
/* Check if creating the Avahi server object succeeded */
3182
if(mc.server == NULL){
3183
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3184
avahi_strerror(ret));
3185
exitcode = EX_UNAVAILABLE;
3193
/* Create the Avahi service browser */
3194
sb = avahi_s_service_browser_new(mc.server, if_index,
3195
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3196
NULL, 0, browse_callback,
3199
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3200
avahi_strerror(avahi_server_errno(mc.server)));
3201
exitcode = EX_UNAVAILABLE;
3209
/* Run the main loop */
3212
fprintf_plus(stderr, "Starting Avahi loop search\n");
3215
ret = avahi_loop_with_timeout(simple_poll,
3216
(int)(retry_interval * 1000), &mc);
3218
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3219
(ret == 0) ? "successfully" : "with error");
1089
fprintf(stderr, "%s exiting\n", argv[0]);
1092
/* Cleanup things */
1094
avahi_s_service_browser_free(sb);
1096
if(mc.server != NULL)
1097
avahi_server_free(mc.server);
1099
if(mc.simple_poll != NULL)
1100
avahi_simple_poll_free(mc.simple_poll);
1102
if(gnutls_initalized){
1103
gnutls_certificate_free_credentials(mc.cred);
1104
gnutls_global_deinit();
1105
gnutls_dh_params_deinit(mc.dh_params);
1108
if(gpgme_initalized){
1109
gpgme_release(mc.ctx);
1112
/* Removes the temp directory used by GPGME */
1113
if(tempdir[0] != '\0'){
1115
struct dirent *direntry;
1116
d = opendir(tempdir);
1118
if(errno != ENOENT){
1123
direntry = readdir(d);
1124
if(direntry == NULL){
1127
if(direntry->d_type == DT_REG){
1128
char *fullname = NULL;
1129
ret = asprintf(&fullname, "%s/%s", tempdir,
1135
ret = unlink(fullname);
1137
fprintf(stderr, "unlink(\"%s\"): %s",
1138
fullname, strerror(errno));
1145
ret = rmdir(tempdir);
1146
if(ret == -1 and errno != ENOENT){
3225
if(signal_received){
3226
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3227
argv[0], signal_received,
3228
strsignal(signal_received));
3230
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3234
/* Cleanup things */
3235
free(mc.interfaces);
3238
avahi_s_service_browser_free(sb);
3240
if(mc.server != NULL)
3241
avahi_server_free(mc.server);
3243
if(simple_poll != NULL)
3244
avahi_simple_poll_free(simple_poll);
3246
if(gnutls_initialized){
3247
gnutls_certificate_free_credentials(mc.cred);
3248
gnutls_dh_params_deinit(mc.dh_params);
3251
if(gpgme_initialized){
3252
gpgme_release(mc.ctx);
3255
/* Cleans up the circular linked list of Mandos servers the client
3257
if(mc.current_server != NULL){
3258
mc.current_server->prev->next = NULL;
3259
while(mc.current_server != NULL){
3260
server *next = mc.current_server->next;
3262
#pragma GCC diagnostic push
3263
#pragma GCC diagnostic ignored "-Wcast-qual"
3265
free((char *)(mc.current_server->ip));
3267
#pragma GCC diagnostic pop
3269
free(mc.current_server);
3270
mc.current_server = next;
3274
/* Re-raise privileges */
3276
ret = raise_privileges();
3279
perror_plus("Failed to raise privileges");
3282
/* Run network hooks */
3283
run_network_hooks("stop", interfaces_hooks != NULL ?
3284
interfaces_hooks : "", delay);
3286
/* Take down the network interfaces which were brought up */
3288
char *interface = NULL;
3289
while((interface = argz_next(interfaces_to_take_down,
3290
interfaces_to_take_down_size,
3292
ret = take_down_interface(interface);
3295
perror_plus("Failed to take down interface");
3298
if(debug and (interfaces_to_take_down == NULL)){
3299
fprintf_plus(stderr, "No interfaces needed to be taken"
3305
ret = lower_privileges_permanently();
3308
perror_plus("Failed to lower privileges permanently");
3312
free(interfaces_to_take_down);
3313
free(interfaces_hooks);
3315
void clean_dir_at(int base, const char * const dirname,
3317
struct dirent **direntries = NULL;
3319
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3325
perror_plus("open");
3328
int numentries = scandirat(dir_fd, ".", &direntries,
3329
notdotentries, alphasort);
3330
if(numentries >= 0){
3331
for(int i = 0; i < numentries; i++){
3333
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3334
dirname, direntries[i]->d_name);
3336
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3338
if(errno == EISDIR){
3339
dret = unlinkat(dir_fd, direntries[i]->d_name,
3342
if((dret == -1) and (errno == ENOTEMPTY)
3343
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3344
== 0) and (level == 0)){
3345
/* Recurse only in this special case */
3346
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3349
if((dret == -1) and (errno != ENOENT)){
3350
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3351
direntries[i]->d_name, strerror(errno));
3354
free(direntries[i]);
3357
/* need to clean even if 0 because man page doesn't specify */
3359
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3360
if(dret == -1 and errno != ENOENT){
3361
perror_plus("rmdir");
3364
perror_plus("scandirat");
3369
/* Removes the GPGME temp directory and all files inside */
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);
3375
sigemptyset(&old_sigterm_action.sa_mask);
3376
old_sigterm_action.sa_handler = SIG_DFL;
3377
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3378
&old_sigterm_action,
3381
perror_plus("sigaction");
3384
ret = raise(signal_received);
3385
} while(ret != 0 and errno == EINTR);
3387
perror_plus("raise");
3390
TEMP_FAILURE_RETRY(pause());