26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
39
stdout, ferror(), sscanf(),
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open(), S_ISREG */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
60
#include <fcntl.h> /* open(), unlinkat() */
56
struct in6_addr, inet_pton(),
58
#include <fcntl.h> /* open() */
61
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
80
74
#include <argp.h> /* struct argp_option, error_t, struct
81
75
argp_state, struct argp,
82
76
argp_parse(), ARGP_KEY_ARG,
83
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
100
79
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
104
83
/* All Avahi types, constants and functions
133
112
#define PATHDIR "/conf/conf.d/mandos"
134
113
#define SECKEY "seckey.txt"
135
114
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
116
bool debug = false;
139
117
static const char mandos_protocol_version[] = "1";
140
118
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
121
/* Used for passing in values through the Avahi callback functions */
123
AvahiSimplePoll *simple_poll;
162
124
AvahiServer *server;
163
125
gnutls_certificate_credentials_t cred;
164
126
unsigned int dh_bits;
165
127
gnutls_dh_params_t dh_params;
166
128
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
130
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
201
135
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
138
size_t buffer_capacity){
206
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
144
buffer_capacity += BUFFER_SIZE;
218
146
return buffer_capacity;
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
270
150
* Initialize GPGME.
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
153
const char *pubkey, const char *tempdir){
277
155
gpgme_error_t rc;
278
156
gpgme_engine_info_t engine_info;
281
160
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
162
bool import_key(const char *filename){
286
164
gpgme_data_t pgp_data;
288
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
172
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
173
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
174
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
301
179
rc = gpgme_op_import(mc->ctx, pgp_data);
302
180
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
308
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
190
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
321
199
gpgme_check_version(NULL);
322
200
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
201
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
202
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
329
/* Set GPGME home directory for the OpenPGP engine only */
207
/* Set GPGME home directory for the OpenPGP engine only */
330
208
rc = gpgme_get_engine_info(&engine_info);
331
209
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
210
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
211
gpgme_strsource(rc), gpgme_strerror(rc));
336
214
while(engine_info != NULL){
542
409
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
544
411
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
416
safer_gnutls_strerror(ret));
547
417
gnutls_global_deinit();
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
422
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
423
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
558
427
ret = gnutls_certificate_set_openpgp_key_file
559
428
(mc->cred, pubkeyfilename, seckeyfilename,
560
429
GNUTLS_OPENPGP_FMT_BASE64);
561
430
if(ret != GNUTLS_E_SUCCESS){
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
432
"Error[%d] while reading the OpenPGP key pair ('%s',"
433
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
434
fprintf(stderr, "The GnuTLS error is: %s\n",
435
safer_gnutls_strerror(ret));
570
439
/* GnuTLS server initialization */
571
440
ret = gnutls_dh_params_init(&mc->dh_params);
572
441
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
443
" %s\n", safer_gnutls_strerror(ret));
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
586
buffer_capacity = incbuffer((char **)&buffer.data,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
601
/* check bytes_read for failure */
608
buffer.size += (unsigned int)bytes_read;
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
651
fprintf_plus(stderr, "Falling back to security parameter"
653
safe_string(gnutls_sec_param_get_name
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
679
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
447
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
449
safer_gnutls_strerror(ret));
757
506
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
507
__attribute__((unused)) const char *txt){}
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
816
AvahiIfIndex if_index){
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
855
perror_plus("setgid");
858
/* Reset supplementary groups */
860
ret = setgroups(0, NULL);
862
perror_plus("setgroups");
866
ret = dup2(devnull, STDIN_FILENO);
868
perror_plus("dup2(devnull, STDIN_FILENO)");
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
873
perror_plus("close");
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
886
if(helperdir_fd == -1){
888
_exit(EX_UNAVAILABLE);
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
906
#pragma GCC diagnostic pop
908
perror_plus("fexecve");
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
928
if(kill(pid, SIGTERM) == -1){
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
937
} while(pret == -1 and errno == EINTR);
939
perror_plus("waitpid");
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
965
return add_delete_local_route(true, address, if_index);
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
974
return add_delete_local_route(false, address, if_index);
977
509
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
510
static int start_mandos_communication(const char *ip, uint16_t port,
980
511
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
982
int ret, tcp_sd = -1;
984
struct sockaddr_storage to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
985
516
char *buffer = NULL;
986
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
987
518
size_t buffer_length = 0;
988
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
523
char interface[IF_NAMESIZE];
991
524
gnutls_session_t session;
992
int pf; /* Protocol family */
993
bool route_added = false;
1010
fprintf_plus(stderr, "Bad address family: %d\n", af);
1015
/* If the interface is specified and we have a list of interfaces */
1016
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1017
/* Check if the interface is one of the interfaces we are using */
1020
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1030
/* This interface does not match any in the list, so we don't
1031
connect to the server */
1033
char interface[IF_NAMESIZE];
1034
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1035
perror_plus("if_indextoname");
1037
fprintf_plus(stderr, "Skipping server on non-used interface"
1039
if_indextoname((unsigned int)if_index,
1047
ret = init_gnutls_session(&session, mc);
526
ret = init_gnutls_session(mc, &session);
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
1060
perror_plus("socket");
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
547
fprintf(stderr, "Binding to interface %s\n", interface);
1070
550
memset(&to, 0, sizeof(to));
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1080
perror_plus("inet_pton");
1086
fprintf_plus(stderr, "Bad address: %s\n", ip);
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1094
if(if_index == AVAHI_IF_UNSPEC){
1095
fprintf_plus(stderr, "An IPv6 link-local address is"
1096
" incomplete without a network interface\n");
1100
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
560
fprintf(stderr, "Bad address: %s\n", ip);
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
565
-Wunreachable-code */
567
to.in6.sin6_scope_id = (uint32_t)if_index;
1113
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1114
char interface[IF_NAMESIZE];
1115
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
perror_plus("if_indextoname");
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
1125
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1188
route_added = add_local_route(ip, if_index);
1194
if(errno != ECONNREFUSED or debug){
1196
perror_plus("connect");
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
577
if(strcmp(addrstr, ip) != 0){
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
583
ret = connect(tcp_sd, &to.in, sizeof(to));
1209
589
const char *out = mandos_protocol_version;
1538
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1539
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1541
fprintf_plus(stderr, "No Mandos server found, still"
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1548
/* Signal handler that stops main loop after SIGTERM */
1549
static void handle_sigterm(int sig){
1554
signal_received = sig;
1555
int old_errno = errno;
1556
/* set main loop to exit */
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1563
__attribute__((nonnull, warn_unused_result))
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1571
perror_plus("socket");
1575
strcpy(ifr->ifr_name, ifname);
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1580
perror_plus("ioctl SIOCGIFFLAGS");
1588
__attribute__((nonnull, warn_unused_result))
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1591
/* Reject the loopback device */
1592
if(ifr->ifr_flags & IFF_LOOPBACK){
1594
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1599
/* Accept point-to-point devices only if connect_to is specified */
1600
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1602
fprintf_plus(stderr, "Accepting point-to-point interface"
1603
" \"%s\"\n", ifname);
1607
/* Otherwise, reject non-broadcast-capable devices */
1608
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1610
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1611
" \"%s\"\n", ifname);
1615
/* Reject non-ARP interfaces (including dummy interfaces) */
1616
if(ifr->ifr_flags & IFF_NOARP){
1618
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1624
/* Accept this device */
1626
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1632
* This function determines if a directory entry in /sys/class/net
1633
* corresponds to an acceptable network device.
1634
* (This function is passed to scandir(3) as a filter function.)
1636
__attribute__((nonnull, warn_unused_result))
1637
int good_interface(const struct dirent *if_entry){
1638
if(if_entry->d_name[0] == '.'){
1643
if(not get_flags(if_entry->d_name, &ifr)){
1645
fprintf_plus(stderr, "Failed to get flags for interface "
1646
"\"%s\"\n", if_entry->d_name);
1651
if(not good_flags(if_entry->d_name, &ifr)){
1658
* This function determines if a network interface is up.
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1663
if(not get_flags(interface, &ifr)){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1675
* This function determines if a network interface is running
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1680
if(not get_flags(interface, &ifr)){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1691
__attribute__((nonnull, pure, warn_unused_result))
1692
int notdotentries(const struct dirent *direntry){
1693
/* Skip "." and ".." */
1694
if(direntry->d_name[0] == '.'
1695
and (direntry->d_name[1] == '\0'
1696
or (direntry->d_name[1] == '.'
1697
and direntry->d_name[2] == '\0'))){
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
int runnable_hook(const struct dirent *direntry){
1710
if((direntry->d_name)[0] == '\0'){
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
"abcdefghijklmnopqrstuvwxyz"
1719
if((direntry->d_name)[sret] != '\0'){
1720
/* Contains non-allowed characters */
1722
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1731
perror_plus("Could not stat hook");
1735
if(not (S_ISREG(st.st_mode))){
1736
/* Not a regular file */
1738
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1743
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1744
/* Not executable */
1746
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1752
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1762
struct timespec now;
1763
struct timespec waited_time;
1764
intmax_t block_time;
1767
if(mc->current_server == NULL){
1769
fprintf_plus(stderr, "Wait until first server is found."
1772
ret = avahi_simple_poll_iterate(s, -1);
1775
fprintf_plus(stderr, "Check current_server if we should run"
1778
/* the current time */
1779
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1781
perror_plus("clock_gettime");
1784
/* Calculating in ms how long time between now and server
1785
who we visted longest time ago. Now - last seen. */
1786
waited_time.tv_sec = (now.tv_sec
1787
- mc->current_server->last_seen.tv_sec);
1788
waited_time.tv_nsec = (now.tv_nsec
1789
- mc->current_server->last_seen.tv_nsec);
1790
/* total time is 10s/10,000ms.
1791
Converting to s from ms by dividing by 1,000,
1792
and ns to ms by dividing by 1,000,000. */
1793
block_time = ((retry_interval
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1802
if(block_time <= 0){
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1808
avahi_simple_poll_quit(s);
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1812
&mc->current_server->last_seen);
1814
perror_plus("clock_gettime");
1817
mc->current_server = mc->current_server->next;
1818
block_time = 0; /* Call avahi to find new Mandos
1819
servers, but don't block */
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1825
if(ret > 0 or errno != EINTR){
1826
return (ret != 1) ? ret : 0;
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1846
perror_plus("open");
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1862
#endif /* not __GLIBC__ */
1864
perror_plus("scandir");
1867
struct dirent *direntry;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1880
pid_t hook_pid = fork();
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1886
perror_plus("Failed to raise privileges");
1893
perror_plus("setgid");
1896
/* Reset supplementary groups */
1898
ret = setgroups(0, NULL);
1900
perror_plus("setgroups");
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1905
perror_plus("setenv");
1908
ret = setenv("DEVICE", interface, 1);
1910
perror_plus("setenv");
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1915
perror_plus("setenv");
1918
ret = setenv("MODE", mode, 1);
1920
perror_plus("setenv");
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1926
perror_plus("asprintf");
1929
ret = setenv("DELAY", delaystring, 1);
1932
perror_plus("setenv");
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1939
perror_plus("setenv");
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1954
ret = dup2(devnull, STDIN_FILENO);
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1961
perror_plus("close");
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1976
perror_plus("fork");
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2025
error_t old_errno = errno;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2049
network.ifr_flags |= IFF_UP; /* set flag */
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2054
perror_plus("socket");
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2062
perror_plus("close");
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2077
perror_plus("Failed to raise privileges");
2082
bool restore_loglevel = false;
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2090
restore_loglevel = true;
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2103
#endif /* __linux__ */
2105
/* If raise_privileges() succeeded above */
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2111
perror_plus("Failed to lower privileges");
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2118
perror_plus("close");
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2173
perror_plus("socket");
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2187
perror_plus("Failed to raise privileges");
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2193
/* If raise_privileges() succeeded above */
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2199
perror_plus("Failed to lower privileges");
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2206
perror_plus("close");
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2224
824
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2229
825
AvahiSServiceBrowser *sb = NULL;
2232
828
intmax_t tmpmax;
2234
830
int exitcode = EXIT_SUCCESS;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
831
const char *interface = "eth0";
832
struct ifreq network;
836
char *connect_to = NULL;
837
char tempdir[] = "/tmp/mandosXXXXXX";
838
bool tempdir_created = false;
2240
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
840
const char *seckey = PATHDIR "/" SECKEY;
2242
841
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
2245
846
bool gnutls_initialized = false;
2246
847
bool gpgme_initialized = false;
2248
double retry_interval = 10; /* 10s between trying a server and
2249
retrying the same server again */
2251
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2252
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2257
/* Lower any group privileges we might have, just to be safe */
2261
perror_plus("setgid");
2264
/* Lower user privileges (temporarily) */
2268
perror_plus("seteuid");
2276
851
struct argp_option options[] = {
2362
915
mc.priority = arg;
2364
917
case 131: /* --delay */
2366
delay = strtof(arg, &tmp);
2367
if(errno != 0 or tmp == arg or *tmp != '\0'){
2368
argp_error(state, "Bad delay");
2370
case 132: /* --retry */
2372
retry_interval = strtod(arg, &tmp);
2373
if(errno != 0 or tmp == arg or *tmp != '\0'
2374
or (retry_interval * 1000) > INT_MAX
2375
or retry_interval < 0){
2376
argp_error(state, "Bad retry interval");
2379
case 133: /* --network-hook-dir */
2383
* These reproduce what we would get without ARGP_NO_HELP
2385
case '?': /* --help */
2386
argp_state_help(state, state->out_stream,
2387
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2388
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2389
case -3: /* --usage */
2390
argp_state_help(state, state->out_stream,
2391
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2392
case 'V': /* --version */
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2394
exit(argp_err_exit_status);
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
2397
929
return ARGP_ERR_UNKNOWN;
2402
934
struct argp argp = { .options = options, .parser = parse_opt,
2404
936
.doc = "Mandos client -- Get and decrypt"
2405
937
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2414
perror_plus("argp_parse");
2415
exitcode = EX_OSERR;
2418
exitcode = EX_USAGE;
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
941
exitcode = EXIT_FAILURE;
946
/* If the interface is down, bring it up */
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
951
ret = klogctl(8, NULL, 5);
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2431
perror_plus("Failed to raise privileges");
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2436
int seckey_fd = open(seckey, O_RDONLY);
2437
if(seckey_fd == -1){
2438
perror_plus("open");
2440
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2442
perror_plus("fstat");
2444
if(S_ISREG(st.st_mode)
2445
and st.st_uid == 0 and st.st_gid == 0){
2446
ret = fchown(seckey_fd, uid, gid);
2448
perror_plus("fchown");
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
int pubkey_fd = open(pubkey, O_RDONLY);
2458
if(pubkey_fd == -1){
2459
perror_plus("open");
2461
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2463
perror_plus("fstat");
2465
if(S_ISREG(st.st_mode)
2466
and st.st_uid == 0 and st.st_gid == 0){
2467
ret = fchown(pubkey_fd, uid, gid);
2469
perror_plus("fchown");
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2477
/* Lower privileges */
2478
ret_errno = lower_privileges();
2481
perror_plus("Failed to lower privileges");
2486
/* Remove invalid interface names (except "none") */
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2503
/* Run network hooks */
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
960
exitcode = EXIT_FAILURE;
962
ret = klogctl(7, NULL, 0);
969
strcpy(network.ifr_name, interface);
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
972
perror("ioctl SIOCGIFFLAGS");
974
ret = klogctl(7, NULL, 0);
979
exitcode = EXIT_FAILURE;
982
if((network.ifr_flags & IFF_UP) == 0){
983
network.ifr_flags |= IFF_UP;
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
989
ret = klogctl(7, NULL, 0);
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
2519
avahi_set_log_function(empty_log);
2522
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2523
from the signal handler */
2524
/* Initialize the pseudo-RNG for Avahi */
2525
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
2528
fprintf_plus(stderr,
2529
"Avahi: Failed to create simple poll object.\n");
2530
exitcode = EX_UNAVAILABLE;
2534
sigemptyset(&sigterm_action.sa_mask);
2535
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2537
perror_plus("sigaddset");
2538
exitcode = EX_OSERR;
2541
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2543
perror_plus("sigaddset");
2544
exitcode = EX_OSERR;
2547
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2549
perror_plus("sigaddset");
2550
exitcode = EX_OSERR;
2553
/* Need to check if the handler is SIG_IGN before handling:
2554
| [[info:libc:Initial Signal Actions]] |
2555
| [[info:libc:Basic Signal Handling]] |
2557
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2559
perror_plus("sigaction");
2562
if(old_sigterm_action.sa_handler != SIG_IGN){
2563
ret = sigaction(SIGINT, &sigterm_action, NULL);
2565
perror_plus("sigaction");
2566
exitcode = EX_OSERR;
2570
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2572
perror_plus("sigaction");
2575
if(old_sigterm_action.sa_handler != SIG_IGN){
2576
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2578
perror_plus("sigaction");
2579
exitcode = EX_OSERR;
2583
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2585
perror_plus("sigaction");
2588
if(old_sigterm_action.sa_handler != SIG_IGN){
2589
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2591
perror_plus("sigaction");
2592
exitcode = EX_OSERR;
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2618
free(direntries[i]);
2625
fprintf_plus(stderr, "Could not find a network interface\n");
2626
exitcode = EXIT_FAILURE;
2631
/* Bring up interfaces which are down, and remove any "none"s */
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
997
/* sleep checking until interface is running */
998
for(int i=0; i < delay * 4; i++){
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1001
perror("ioctl SIOCGIFFLAGS");
1002
} else if(network.ifr_flags & IFF_RUNNING){
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2656
perror_plus("Failed to bring up interface");
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2662
perror_plus("argz_add");
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1006
ret = nanosleep(&sleeptime, NULL);
1007
if(ret == -1 and errno != EINTR){
1008
perror("nanosleep");
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
exitcode = EX_UNAVAILABLE;
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1039
fprintf(stderr, "init_gnutls_global failed\n");
1040
exitcode = EXIT_FAILURE;
2691
1043
gnutls_initialized = true;
2698
/* Try /run/tmp before /tmp */
2699
tempdir = mkdtemp(run_tempdir);
2700
if(tempdir == NULL and errno == ENOENT){
2702
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2703
run_tempdir, old_tempdir);
2705
tempdir = mkdtemp(old_tempdir);
2707
if(tempdir == NULL){
2708
perror_plus("mkdtemp");
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2717
fprintf_plus(stderr, "init_gpgme failed\n");
2718
exitcode = EX_UNAVAILABLE;
1046
if(mkdtemp(tempdir) == NULL){
1050
tempdir_created = true;
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1053
fprintf(stderr, "init_gpgme failed\n");
1054
exitcode = EXIT_FAILURE;
2721
1057
gpgme_initialized = true;
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2885
1179
gpgme_release(mc.ctx);
2888
/* Cleans up the circular linked list of Mandos servers the client
2890
if(mc.current_server != NULL){
2891
mc.current_server->prev->next = NULL;
2892
while(mc.current_server != NULL){
2893
server *next = mc.current_server->next;
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2898
free((char *)(mc.current_server->ip));
2900
#pragma GCC diagnostic pop
2902
free(mc.current_server);
2903
mc.current_server = next;
2907
/* Re-raise privileges */
2909
ret_errno = raise_privileges();
2912
perror_plus("Failed to raise privileges");
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2919
/* Take down the network interfaces which were brought up */
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2925
ret_errno = take_down_interface(interface);
2928
perror_plus("Failed to take down interface");
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2938
ret_errno = lower_privileges_permanently();
2941
perror_plus("Failed to lower privileges permanently");
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2948
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2978
free(direntries[i]);
2981
/* need to clean even if 0 because man page doesn't specify */
2983
if(numentries == -1){
2984
perror_plus("scandir");
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2996
sigemptyset(&old_sigterm_action.sa_mask);
2997
old_sigterm_action.sa_handler = SIG_DFL;
2998
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2999
&old_sigterm_action,
3002
perror_plus("sigaction");
3005
ret = raise(signal_received);
3006
} while(ret != 0 and errno == EINTR);
3008
perror_plus("raise");
3011
TEMP_FAILURE_RETRY(pause());
1182
/* Removes the temp directory used by GPGME */
1183
if(tempdir_created){
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1188
if(errno != ENOENT){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1204
char *fullname = NULL;
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
1211
ret = remove(fullname);
1213
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1220
ret = rmdir(tempdir);
1221
if(ret == -1 and errno != ENOENT){
3014
1226
return exitcode;