32
33
/* Needed by GPGME, specifically gpgme_data_seek() */
33
34
#ifndef _LARGEFILE_SOURCE
34
35
#define _LARGEFILE_SOURCE
36
#endif /* not _LARGEFILE_SOURCE */
36
37
#ifndef _FILE_OFFSET_BITS
37
38
#define _FILE_OFFSET_BITS 64
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
39
#endif /* not _FILE_OFFSET_BITS */
41
#define _GNU_SOURCE /* program_invocation_short_name,
42
TEMP_FAILURE_RETRY(), O_CLOEXEC,
43
scandirat(), asprintf() */
48
44
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open(), S_ISREG */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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,
64
#include <errno.h> /* perror(), errno,
65
program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
75
setgid(), pause(), _exit() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
88
WEXITSTATUS(), WTERMSIG() */
89
#include <grp.h> /* setgroups() */
90
#include <argz.h> /* argz_add_sep(), argz_next(),
91
argz_delete(), argz_append(),
92
argz_stringify(), argz_add(),
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 */
96
140
#include <sys/klog.h> /* klogctl() */
225
279
if(new_server->ip == NULL){
226
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
229
298
/* Special case of first server */
230
if (mc.current_server == NULL){
299
if(*current_server == NULL){
231
300
new_server->next = new_server;
232
301
new_server->prev = new_server;
233
mc.current_server = new_server;
234
/* Place the new server last in the list */
302
*current_server = new_server;
236
new_server->next = mc.current_server;
237
new_server->prev = mc.current_server->prev;
304
/* Place the new server last in the list */
305
new_server->next = *current_server;
306
new_server->prev = (*current_server)->prev;
238
307
new_server->prev->next = new_server;
239
mc.current_server->prev = new_server;
241
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
243
perror_plus("clock_gettime");
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){
250
366
* Initialize GPGME.
252
static bool init_gpgme(const char *seckey, const char *pubkey,
253
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,
254
373
gpgme_error_t rc;
255
374
gpgme_engine_info_t engine_info;
259
377
* Helper function to insert pub and seckey to the engine keyring.
261
bool import_key(const char *filename){
379
bool import_key(const char * const filename){
264
382
gpgme_data_t pgp_data;
279
rc = gpgme_op_import(mc.ctx, pgp_data);
446
rc = gpgme_op_import(mc->ctx, pgp_data);
280
447
if(rc != GPG_ERR_NO_ERROR){
281
448
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
282
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");
286
ret = (int)TEMP_FAILURE_RETRY(close(fd));
288
530
perror_plus("close");
380
622
/* Decrypt data from the cryptotext data buffer to the plaintext
382
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
624
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
383
625
if(rc != GPG_ERR_NO_ERROR){
384
626
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
385
627
gpgme_strsource(rc), gpgme_strerror(rc));
386
628
plaintext_length = -1;
388
630
gpgme_decrypt_result_t result;
389
result = gpgme_op_decrypt_result(mc.ctx);
631
result = gpgme_op_decrypt_result(mc->ctx);
390
632
if(result == NULL){
391
633
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
393
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
394
result->unsupported_algorithm);
395
fprintf_plus(stderr, "Wrong key usage: %u\n",
396
result->wrong_key_usage);
635
if(result->unsupported_algorithm != NULL) {
636
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
637
result->unsupported_algorithm);
639
fprintf_plus(stderr, "Wrong key usage: %s\n",
640
result->wrong_key_usage ? "Yes" : "No");
397
641
if(result->file_name != NULL){
398
642
fprintf_plus(stderr, "File name: %s\n", result->file_name);
400
gpgme_recipient_t recipient;
401
recipient = result->recipients;
402
while(recipient != NULL){
645
for(gpgme_recipient_t r = result->recipients; r != NULL;
403
647
fprintf_plus(stderr, "Public key algorithm: %s\n",
404
gpgme_pubkey_algo_name
405
(recipient->pubkey_algo));
406
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
648
gpgme_pubkey_algo_name(r->pubkey_algo));
649
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
407
650
fprintf_plus(stderr, "Secret key available: %s\n",
408
recipient->status == GPG_ERR_NO_SECKEY
410
recipient = recipient->next;
651
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
536
795
/* GnuTLS server initialization */
537
ret = gnutls_dh_params_init(&mc.dh_params);
796
ret = gnutls_dh_params_init(&mc->dh_params);
538
797
if(ret != GNUTLS_E_SUCCESS){
539
798
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
540
799
" initialization: %s\n",
541
800
safer_gnutls_strerror(ret));
544
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
545
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
547
safer_gnutls_strerror(ret));
551
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
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);
557
gnutls_certificate_free_credentials(mc.cred);
558
gnutls_global_deinit();
559
gnutls_dh_params_deinit(mc.dh_params);
990
gnutls_certificate_free_credentials(mc->cred);
991
gnutls_dh_params_deinit(mc->dh_params);
563
static int init_gnutls_session(gnutls_session_t *session){
995
__attribute__((nonnull, warn_unused_result))
996
static int init_gnutls_session(gnutls_session_t *session,
565
999
/* GnuTLS session creation */
567
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
620
1059
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
621
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);
623
1235
/* Called when a Mandos server is found */
1236
__attribute__((nonnull, warn_unused_result))
624
1237
static int start_mandos_communication(const char *ip, in_port_t port,
625
1238
AvahiIfIndex if_index,
1239
int af, mandos_context *mc){
627
1240
int ret, tcp_sd = -1;
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
1242
struct sockaddr_storage to;
633
1243
char *buffer = NULL;
634
1244
char *decrypted_buffer = NULL;
635
1245
size_t buffer_length = 0;
743
1385
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
744
1386
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
747
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
750
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
754
perror_plus("inet_ntop");
756
if(strcmp(addrstr, ip) != 0){
757
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
768
ret = connect(tcp_sd, &to.in6, sizeof(to));
770
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
773
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
775
perror_plus("connect");
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");
786
1469
const char *out = mandos_protocol_version;
1383
2103
ret = avahi_simple_poll_iterate(s, (int)block_time);
1386
if (ret > 0 or errno != EINTR){
2106
if(ret > 0 or errno != EINTR){
1387
2107
return (ret != 1) ? ret : 0;
1393
/* Set effective uid to 0, return errno */
1394
error_t raise_privileges(void){
1395
error_t old_errno = errno;
1396
error_t ret_errno = 0;
1397
if(seteuid(0) == -1){
1399
perror_plus("seteuid");
1405
/* Set effective and real user ID to 0. Return errno. */
1406
error_t raise_privileges_permanently(void){
1407
error_t old_errno = errno;
1408
error_t ret_errno = raise_privileges();
1413
if(setuid(0) == -1){
1415
perror_plus("seteuid");
1421
/* Set effective user ID to unprivileged saved user ID */
1422
error_t lower_privileges(void){
1423
error_t old_errno = errno;
1424
error_t ret_errno = 0;
1425
if(seteuid(uid) == -1){
1427
perror_plus("seteuid");
1433
/* Lower privileges permanently */
1434
error_t lower_privileges_permanently(void){
1435
error_t old_errno = errno;
1436
error_t ret_errno = 0;
1437
if(setuid(uid) == -1){
1439
perror_plus("setuid");
1445
bool run_network_hooks(const char *mode, const char *interface,
2113
__attribute__((nonnull))
2114
void run_network_hooks(const char *mode, const char *interface,
1446
2115
const float delay){
1447
struct dirent **direntries;
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");
1448
2144
struct dirent *direntry;
1450
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1453
if(errno == ENOENT){
1455
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1456
" found\n", hookdir);
1459
perror_plus("scandir");
2146
for(int i = 0; i < numhooks; i++){
2147
direntry = direntries[i];
2149
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1462
int devnull = open("/dev/null", O_RDONLY);
1463
for(int i = 0; i < numhooks; i++){
1464
direntry = direntries[i];
1465
char *fullname = NULL;
1466
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
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);
1468
2198
perror_plus("asprintf");
1472
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1475
pid_t hook_pid = fork();
1478
/* Raise privileges */
1479
raise_privileges_permanently();
1484
perror_plus("setgid");
1486
/* Reset supplementary groups */
1488
ret = setgroups(0, NULL);
1490
perror_plus("setgroups");
1492
dup2(devnull, STDIN_FILENO);
1494
dup2(STDERR_FILENO, STDOUT_FILENO);
1495
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1497
perror_plus("setenv");
1500
ret = setenv("DEVICE", interface, 1);
1502
perror_plus("setenv");
1505
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1507
perror_plus("setenv");
1510
ret = setenv("MODE", mode, 1);
1512
perror_plus("setenv");
1516
ret = asprintf(&delaystring, "%f", delay);
1518
perror_plus("asprintf");
1521
ret = setenv("DELAY", delaystring, 1);
1524
perror_plus("setenv");
2201
ret = setenv("DELAY", delaystring, 1);
1527
2203
free(delaystring);
1528
if(connect_to != NULL){
1529
ret = setenv("CONNECT", connect_to, 1);
1531
perror_plus("setenv");
1535
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1536
perror_plus("execl");
1537
_exit(EXIT_FAILURE);
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,
1541
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1542
perror_plus("waitpid");
1546
if(WIFEXITED(status)){
1547
if(WEXITSTATUS(status) != 0){
1548
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1549
" with status %d\n", direntry->d_name,
1550
WEXITSTATUS(status));
1554
} else if(WIFSIGNALED(status)){
1555
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1556
" signal %d\n", direntry->d_name,
1561
fprintf_plus(stderr, "Warning: network hook \"%s\""
1562
" crashed\n", direntry->d_name);
1569
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
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");
1578
error_t bring_up_interface(const char *const interface,
1581
error_t old_errno = errno;
1582
error_t ret_errno = 0;
1583
int ret, ret_setflags;
2294
__attribute__((nonnull, warn_unused_result))
2295
int bring_up_interface(const char *const interface,
2297
int old_errno = errno;
1584
2299
struct ifreq network;
1585
2300
unsigned int if_index = if_nametoindex(interface);
1586
2301
if(if_index == 0){
2121
2952
/* If no interfaces were specified, make a list */
2122
if(interfaces == NULL){
2123
struct dirent **direntries;
2953
if(mc.interfaces == NULL){
2954
struct dirent **direntries = NULL;
2124
2955
/* Look for any good interfaces */
2125
2956
ret = scandir(sys_class_net, &direntries, good_interface,
2128
2959
/* Add all found interfaces to interfaces list */
2129
2960
for(int i = 0; i < ret; ++i){
2130
ret_errno = argz_add(&interfaces, &interfaces_size,
2961
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2131
2962
direntries[i]->d_name);
2132
2963
if(ret_errno != 0){
2133
2965
perror_plus("argz_add");
2966
free(direntries[i]);
2137
2970
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2138
2971
direntries[i]->d_name);
2973
free(direntries[i]);
2141
2975
free(direntries);
2144
2980
fprintf_plus(stderr, "Could not find a network interface\n");
2145
2981
exitcode = EXIT_FAILURE;
2150
/* If we only got one interface, explicitly use only that one */
2151
if(argz_count(interfaces, interfaces_size) == 1){
2153
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2156
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2159
/* Bring up interfaces which are down */
2160
if(not (argz_count(interfaces, interfaces_size) == 1
2161
and strcmp(interfaces, "none") == 0)){
2986
/* Bring up interfaces which are down, and remove any "none"s */
2162
2988
char *interface = NULL;
2163
while((interface = argz_next(interfaces, interfaces_size,
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,
2165
3007
bool interface_was_up = interface_is_up(interface);
2166
ret = bring_up_interface(interface, delay);
3008
errno = bring_up_interface(interface, delay);
2167
3009
if(not interface_was_up){
2170
perror_plus("Failed to bring up interface");
3011
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
3012
" %s\n", interface, strerror(errno));
2172
ret_errno = argz_add(&interfaces_to_take_down,
2173
&interfaces_to_take_down_size,
3014
errno = argz_add(&interfaces_to_take_down,
3015
&interfaces_to_take_down_size,
3018
perror_plus("argz_add");
2180
interfaces_size = 0;
2181
3023
if(debug and (interfaces_to_take_down == NULL)){
2182
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){
3031
fprintf_plus(stderr, "Using only interface \"%s\"\n",
3034
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2190
ret = init_gnutls_global(pubkey, seckey);
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"
2192
3049
fprintf_plus(stderr, "init_gnutls_global failed\n");
2193
3050
exitcode = EX_UNAVAILABLE;
2385
3258
mc.current_server->prev->next = NULL;
2386
3259
while(mc.current_server != NULL){
2387
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
2388
3269
free(mc.current_server);
2389
3270
mc.current_server = next;
2393
/* Re-raise priviliges */
3274
/* Re-raise privileges */
2397
/* Run network hooks */
2398
run_network_hooks("stop", interfaces_hooks != NULL ?
2399
interfaces_hooks : "", delay);
2401
/* Take down the network interfaces which were brought up */
2403
char *interface = NULL;
2404
while((interface=argz_next(interfaces_to_take_down,
2405
interfaces_to_take_down_size,
2407
ret_errno = take_down_interface(interface);
2410
perror_plus("Failed to take down interface");
2413
if(debug and (interfaces_to_take_down == NULL)){
2414
fprintf_plus(stderr, "No interfaces needed to be taken"
2419
lower_privileges_permanently();
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");
2422
3312
free(interfaces_to_take_down);
2423
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");
2425
3369
/* Removes the GPGME temp directory and all files inside */
2426
if(tempdir_created){
2427
struct dirent **direntries = NULL;
2428
struct dirent *direntry = NULL;
2429
int numentries = scandir(tempdir, &direntries, notdotentries,
2431
if (numentries > 0){
2432
for(int i = 0; i < numentries; i++){
2433
direntry = direntries[i];
2434
char *fullname = NULL;
2435
ret = asprintf(&fullname, "%s/%s", tempdir,
2438
perror_plus("asprintf");
2441
ret = remove(fullname);
2443
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2450
/* need to clean even if 0 because man page doesn't specify */
2452
if (numentries == -1){
2453
perror_plus("scandir");
2455
ret = rmdir(tempdir);
2456
if(ret == -1 and errno != ENOENT){
2457
perror_plus("rmdir");
3370
if(tempdir != NULL){
3371
clean_dir_at(-1, tempdir, 0);