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){
651
507
__attribute__((unused)) const char *txt){}
653
509
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
510
static int start_mandos_communication(const char *ip, uint16_t port,
656
511
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
658
int ret, tcp_sd = -1;
660
struct sockaddr_storage to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
661
516
char *buffer = NULL;
662
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
663
518
size_t buffer_length = 0;
664
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
523
char interface[IF_NAMESIZE];
667
524
gnutls_session_t session;
668
int pf; /* Protocol family */
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
698
if(if_nametoindex(interface) == (unsigned int)if_index){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
712
fprintf_plus(stderr, "Skipping server on non-used interface"
714
if_indextoname((unsigned int)if_index,
722
ret = init_gnutls_session(&session, mc);
526
ret = init_gnutls_session(mc, &session);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
735
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);
745
550
memset(&to, 0, sizeof(to));
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
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);
755
perror_plus("inet_pton");
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
769
if(if_index == AVAHI_IF_UNSPEC){
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
775
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
779
((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;
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
789
char interface[IF_NAMESIZE];
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
perror_plus("if_indextoname");
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
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);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
583
ret = connect(tcp_sd, &to.in, sizeof(to));
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
837
perror_plus("connect");
848
589
const char *out = mandos_protocol_version;
1170
815
case AVAHI_BROWSER_ALL_FOR_NOW:
1171
816
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1173
fprintf_plus(stderr, "No Mandos server found, still"
818
fprintf(stderr, "No Mandos server found, still searching...\n");
1180
/* Signal handler that stops main loop after SIGTERM */
1181
static void handle_sigterm(int sig){
1186
signal_received = sig;
1187
int old_errno = errno;
1188
/* set main loop to exit */
1189
if(simple_poll != NULL){
1190
avahi_simple_poll_quit(simple_poll);
1195
__attribute__((nonnull, warn_unused_result))
1196
bool get_flags(const char *ifname, struct ifreq *ifr){
1200
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1203
perror_plus("socket");
1207
strcpy(ifr->ifr_name, ifname);
1208
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1212
perror_plus("ioctl SIOCGIFFLAGS");
1220
__attribute__((nonnull, warn_unused_result))
1221
bool good_flags(const char *ifname, const struct ifreq *ifr){
1223
/* Reject the loopback device */
1224
if(ifr->ifr_flags & IFF_LOOPBACK){
1226
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1231
/* Accept point-to-point devices only if connect_to is specified */
1232
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1234
fprintf_plus(stderr, "Accepting point-to-point interface"
1235
" \"%s\"\n", ifname);
1239
/* Otherwise, reject non-broadcast-capable devices */
1240
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1242
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1243
" \"%s\"\n", ifname);
1247
/* Reject non-ARP interfaces (including dummy interfaces) */
1248
if(ifr->ifr_flags & IFF_NOARP){
1250
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1256
/* Accept this device */
1258
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1264
* This function determines if a directory entry in /sys/class/net
1265
* corresponds to an acceptable network device.
1266
* (This function is passed to scandir(3) as a filter function.)
1268
__attribute__((nonnull, warn_unused_result))
1269
int good_interface(const struct dirent *if_entry){
1270
if(if_entry->d_name[0] == '.'){
1275
if(not get_flags(if_entry->d_name, &ifr)){
1277
fprintf_plus(stderr, "Failed to get flags for interface "
1278
"\"%s\"\n", if_entry->d_name);
1283
if(not good_flags(if_entry->d_name, &ifr)){
1290
* This function determines if a network interface is up.
1292
__attribute__((nonnull, warn_unused_result))
1293
bool interface_is_up(const char *interface){
1295
if(not get_flags(interface, &ifr)){
1297
fprintf_plus(stderr, "Failed to get flags for interface "
1298
"\"%s\"\n", interface);
1303
return (bool)(ifr.ifr_flags & IFF_UP);
1307
* This function determines if a network interface is running
1309
__attribute__((nonnull, warn_unused_result))
1310
bool interface_is_running(const char *interface){
1312
if(not get_flags(interface, &ifr)){
1314
fprintf_plus(stderr, "Failed to get flags for interface "
1315
"\"%s\"\n", interface);
1320
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1323
__attribute__((nonnull, pure, warn_unused_result))
1324
int notdotentries(const struct dirent *direntry){
1325
/* Skip "." and ".." */
1326
if(direntry->d_name[0] == '.'
1327
and (direntry->d_name[1] == '\0'
1328
or (direntry->d_name[1] == '.'
1329
and direntry->d_name[2] == '\0'))){
1335
/* Is this directory entry a runnable program? */
1336
__attribute__((nonnull, warn_unused_result))
1337
int runnable_hook(const struct dirent *direntry){
1342
if((direntry->d_name)[0] == '\0'){
1347
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1348
"abcdefghijklmnopqrstuvwxyz"
1351
if((direntry->d_name)[sret] != '\0'){
1352
/* Contains non-allowed characters */
1354
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1360
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1363
perror_plus("Could not stat hook");
1367
if(not (S_ISREG(st.st_mode))){
1368
/* Not a regular file */
1370
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1375
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1376
/* Not executable */
1378
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1384
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1390
__attribute__((nonnull, warn_unused_result))
1391
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1392
mandos_context *mc){
1394
struct timespec now;
1395
struct timespec waited_time;
1396
intmax_t block_time;
1399
if(mc->current_server == NULL){
1401
fprintf_plus(stderr, "Wait until first server is found."
1404
ret = avahi_simple_poll_iterate(s, -1);
1407
fprintf_plus(stderr, "Check current_server if we should run"
1410
/* the current time */
1411
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1413
perror_plus("clock_gettime");
1416
/* Calculating in ms how long time between now and server
1417
who we visted longest time ago. Now - last seen. */
1418
waited_time.tv_sec = (now.tv_sec
1419
- mc->current_server->last_seen.tv_sec);
1420
waited_time.tv_nsec = (now.tv_nsec
1421
- mc->current_server->last_seen.tv_nsec);
1422
/* total time is 10s/10,000ms.
1423
Converting to s from ms by dividing by 1,000,
1424
and ns to ms by dividing by 1,000,000. */
1425
block_time = ((retry_interval
1426
- ((intmax_t)waited_time.tv_sec * 1000))
1427
- ((intmax_t)waited_time.tv_nsec / 1000000));
1430
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1434
if(block_time <= 0){
1435
ret = start_mandos_communication(mc->current_server->ip,
1436
mc->current_server->port,
1437
mc->current_server->if_index,
1438
mc->current_server->af, mc);
1440
avahi_simple_poll_quit(s);
1443
ret = clock_gettime(CLOCK_MONOTONIC,
1444
&mc->current_server->last_seen);
1446
perror_plus("clock_gettime");
1449
mc->current_server = mc->current_server->next;
1450
block_time = 0; /* Call avahi to find new Mandos
1451
servers, but don't block */
1454
ret = avahi_simple_poll_iterate(s, (int)block_time);
1457
if(ret > 0 or errno != EINTR){
1458
return (ret != 1) ? ret : 0;
1464
/* Set effective uid to 0, return errno */
1465
__attribute__((warn_unused_result))
1466
error_t raise_privileges(void){
1467
error_t old_errno = errno;
1468
error_t ret_errno = 0;
1469
if(seteuid(0) == -1){
1476
/* Set effective and real user ID to 0. Return errno. */
1477
__attribute__((warn_unused_result))
1478
error_t raise_privileges_permanently(void){
1479
error_t old_errno = errno;
1480
error_t ret_errno = raise_privileges();
1485
if(setuid(0) == -1){
1492
/* Set effective user ID to unprivileged saved user ID */
1493
__attribute__((warn_unused_result))
1494
error_t lower_privileges(void){
1495
error_t old_errno = errno;
1496
error_t ret_errno = 0;
1497
if(seteuid(uid) == -1){
1504
/* Lower privileges permanently */
1505
__attribute__((warn_unused_result))
1506
error_t lower_privileges_permanently(void){
1507
error_t old_errno = errno;
1508
error_t ret_errno = 0;
1509
if(setuid(uid) == -1){
1516
__attribute__((nonnull))
1517
void run_network_hooks(const char *mode, const char *interface,
1519
struct dirent **direntries = NULL;
1520
if(hookdir_fd == -1){
1521
hookdir_fd = open(hookdir, O_RDONLY);
1522
if(hookdir_fd == -1){
1523
if(errno == ENOENT){
1525
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1526
" found\n", hookdir);
1529
perror_plus("open");
1535
#if __GLIBC_PREREQ(2, 15)
1536
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1537
runnable_hook, alphasort);
1538
#else /* not __GLIBC_PREREQ(2, 15) */
1539
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1541
#endif /* not __GLIBC_PREREQ(2, 15) */
1542
#else /* not __GLIBC__ */
1543
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1545
#endif /* not __GLIBC__ */
1547
perror_plus("scandir");
1550
struct dirent *direntry;
1552
int devnull = open("/dev/null", O_RDONLY);
1553
for(int i = 0; i < numhooks; i++){
1554
direntry = direntries[i];
1556
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1559
pid_t hook_pid = fork();
1562
/* Raise privileges */
1563
errno = raise_privileges_permanently();
1565
perror_plus("Failed to raise privileges");
1572
perror_plus("setgid");
1575
/* Reset supplementary groups */
1577
ret = setgroups(0, NULL);
1579
perror_plus("setgroups");
1582
ret = dup2(devnull, STDIN_FILENO);
1584
perror_plus("dup2(devnull, STDIN_FILENO)");
1587
ret = close(devnull);
1589
perror_plus("close");
1592
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1594
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1597
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1599
perror_plus("setenv");
1602
ret = setenv("DEVICE", interface, 1);
1604
perror_plus("setenv");
1607
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1609
perror_plus("setenv");
1612
ret = setenv("MODE", mode, 1);
1614
perror_plus("setenv");
1618
ret = asprintf(&delaystring, "%f", (double)delay);
1620
perror_plus("asprintf");
1623
ret = setenv("DELAY", delaystring, 1);
1626
perror_plus("setenv");
1630
if(connect_to != NULL){
1631
ret = setenv("CONNECT", connect_to, 1);
1633
perror_plus("setenv");
1637
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1639
perror_plus("openat");
1640
_exit(EXIT_FAILURE);
1642
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1643
perror_plus("close");
1644
_exit(EXIT_FAILURE);
1646
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1648
perror_plus("fexecve");
1649
_exit(EXIT_FAILURE);
1653
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1654
perror_plus("waitpid");
1657
if(WIFEXITED(status)){
1658
if(WEXITSTATUS(status) != 0){
1659
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1660
" with status %d\n", direntry->d_name,
1661
WEXITSTATUS(status));
1664
} else if(WIFSIGNALED(status)){
1665
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1666
" signal %d\n", direntry->d_name,
1670
fprintf_plus(stderr, "Warning: network hook \"%s\""
1671
" crashed\n", direntry->d_name);
1676
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1681
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1682
perror_plus("close");
1689
__attribute__((nonnull, warn_unused_result))
1690
error_t bring_up_interface(const char *const interface,
1692
error_t old_errno = errno;
1694
struct ifreq network;
1695
unsigned int if_index = if_nametoindex(interface);
1697
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1707
if(not interface_is_up(interface)){
1708
error_t ret_errno = 0, ioctl_errno = 0;
1709
if(not get_flags(interface, &network)){
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", interface);
1716
network.ifr_flags |= IFF_UP; /* set flag */
1718
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1721
perror_plus("socket");
1727
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1729
perror_plus("close");
1736
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1740
/* Raise privileges */
1741
ret_errno = raise_privileges();
1744
perror_plus("Failed to raise privileges");
1749
bool restore_loglevel = false;
1751
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1752
messages about the network interface to mess up the prompt */
1753
ret_linux = klogctl(8, NULL, 5);
1754
if(ret_linux == -1){
1755
perror_plus("klogctl");
1757
restore_loglevel = true;
1760
#endif /* __linux__ */
1761
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1762
ioctl_errno = errno;
1764
if(restore_loglevel){
1765
ret_linux = klogctl(7, NULL, 0);
1766
if(ret_linux == -1){
1767
perror_plus("klogctl");
1770
#endif /* __linux__ */
1772
/* If raise_privileges() succeeded above */
1774
/* Lower privileges */
1775
ret_errno = lower_privileges();
1778
perror_plus("Failed to lower privileges");
1782
/* Close the socket */
1783
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1785
perror_plus("close");
1788
if(ret_setflags == -1){
1789
errno = ioctl_errno;
1790
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1795
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1799
/* Sleep checking until interface is running.
1800
Check every 0.25s, up to total time of delay */
1801
for(int i=0; i < delay * 4; i++){
1802
if(interface_is_running(interface)){
1805
struct timespec sleeptime = { .tv_nsec = 250000000 };
1806
ret = nanosleep(&sleeptime, NULL);
1807
if(ret == -1 and errno != EINTR){
1808
perror_plus("nanosleep");
1816
__attribute__((nonnull, warn_unused_result))
1817
error_t take_down_interface(const char *const interface){
1818
error_t old_errno = errno;
1819
struct ifreq network;
1820
unsigned int if_index = if_nametoindex(interface);
1822
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1826
if(interface_is_up(interface)){
1827
error_t ret_errno = 0, ioctl_errno = 0;
1828
if(not get_flags(interface, &network) and debug){
1830
fprintf_plus(stderr, "Failed to get flags for interface "
1831
"\"%s\"\n", interface);
1835
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1837
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1840
perror_plus("socket");
1846
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1850
/* Raise privileges */
1851
ret_errno = raise_privileges();
1854
perror_plus("Failed to raise privileges");
1857
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1858
ioctl_errno = errno;
1860
/* If raise_privileges() succeeded above */
1862
/* Lower privileges */
1863
ret_errno = lower_privileges();
1866
perror_plus("Failed to lower privileges");
1870
/* Close the socket */
1871
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1873
perror_plus("close");
1876
if(ret_setflags == -1){
1877
errno = ioctl_errno;
1878
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1883
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1891
824
int main(int argc, char *argv[]){
1892
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1893
.priority = "SECURE256:!CTYPE-X.509:"
1894
"+CTYPE-OPENPGP", .current_server = NULL,
1895
.interfaces = NULL, .interfaces_size = 0 };
1896
825
AvahiSServiceBrowser *sb = NULL;
1899
828
intmax_t tmpmax;
1901
830
int exitcode = EXIT_SUCCESS;
1902
char *interfaces_to_take_down = NULL;
1903
size_t interfaces_to_take_down_size = 0;
1904
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1905
char old_tempdir[] = "/tmp/mandosXXXXXX";
1906
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;
1907
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1908
840
const char *seckey = PATHDIR "/" SECKEY;
1909
841
const char *pubkey = PATHDIR "/" PUBKEY;
1910
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" };
1912
846
bool gnutls_initialized = false;
1913
847
bool gpgme_initialized = false;
1915
double retry_interval = 10; /* 10s between trying a server and
1916
retrying the same server again */
1918
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1924
/* Lower any group privileges we might have, just to be safe */
1928
perror_plus("setgid");
1931
/* Lower user privileges (temporarily) */
1935
perror_plus("seteuid");
1943
851
struct argp_option options[] = {
2029
915
mc.priority = arg;
2031
917
case 131: /* --delay */
2033
delay = strtof(arg, &tmp);
2034
if(errno != 0 or tmp == arg or *tmp != '\0'){
2035
argp_error(state, "Bad delay");
2037
case 132: /* --retry */
2039
retry_interval = strtod(arg, &tmp);
2040
if(errno != 0 or tmp == arg or *tmp != '\0'
2041
or (retry_interval * 1000) > INT_MAX
2042
or retry_interval < 0){
2043
argp_error(state, "Bad retry interval");
2046
case 133: /* --network-hook-dir */
2050
* These reproduce what we would get without ARGP_NO_HELP
2052
case '?': /* --help */
2053
argp_state_help(state, state->out_stream,
2054
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2055
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2056
case -3: /* --usage */
2057
argp_state_help(state, state->out_stream,
2058
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2059
case 'V': /* --version */
2060
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2061
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");
2064
929
return ARGP_ERR_UNKNOWN;
2069
934
struct argp argp = { .options = options, .parser = parse_opt,
2071
936
.doc = "Mandos client -- Get and decrypt"
2072
937
" passwords from a Mandos server" };
2073
ret = argp_parse(&argp, argc, argv,
2074
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2081
perror_plus("argp_parse");
2082
exitcode = EX_OSERR;
2085
exitcode = EX_USAGE;
2091
/* Work around Debian bug #633582:
2092
<http://bugs.debian.org/633582> */
2094
/* Re-raise privileges */
2095
ret_errno = raise_privileges();
2098
perror_plus("Failed to raise privileges");
2102
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2103
int seckey_fd = open(seckey, O_RDONLY);
2104
if(seckey_fd == -1){
2105
perror_plus("open");
2107
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2109
perror_plus("fstat");
2111
if(S_ISREG(st.st_mode)
2112
and st.st_uid == 0 and st.st_gid == 0){
2113
ret = fchown(seckey_fd, uid, gid);
2115
perror_plus("fchown");
2119
TEMP_FAILURE_RETRY(close(seckey_fd));
2123
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2124
int pubkey_fd = open(pubkey, O_RDONLY);
2125
if(pubkey_fd == -1){
2126
perror_plus("open");
2128
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2130
perror_plus("fstat");
2132
if(S_ISREG(st.st_mode)
2133
and st.st_uid == 0 and st.st_gid == 0){
2134
ret = fchown(pubkey_fd, uid, gid);
2136
perror_plus("fchown");
2140
TEMP_FAILURE_RETRY(close(pubkey_fd));
2144
/* Lower privileges */
2145
ret_errno = lower_privileges();
2148
perror_plus("Failed to lower privileges");
2153
/* Remove invalid interface names (except "none") */
2155
char *interface = NULL;
2156
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2158
if(strcmp(interface, "none") != 0
2159
and if_nametoindex(interface) == 0){
2160
if(interface[0] != '\0'){
2161
fprintf_plus(stderr, "Not using nonexisting interface"
2162
" \"%s\"\n", interface);
2164
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2170
/* Run network hooks */
2172
if(mc.interfaces != NULL){
2173
interfaces_hooks = malloc(mc.interfaces_size);
2174
if(interfaces_hooks == NULL){
2175
perror_plus("malloc");
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 */
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
950
messages to mess up the prompt */
951
ret = klogctl(8, NULL, 5);
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);
2178
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2179
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2181
run_network_hooks("start", interfaces_hooks != NULL ?
2182
interfaces_hooks : "", delay);
2186
avahi_set_log_function(empty_log);
2189
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2190
from the signal handler */
2191
/* Initialize the pseudo-RNG for Avahi */
2192
srand((unsigned int) time(NULL));
2193
simple_poll = avahi_simple_poll_new();
2194
if(simple_poll == NULL){
2195
fprintf_plus(stderr,
2196
"Avahi: Failed to create simple poll object.\n");
2197
exitcode = EX_UNAVAILABLE;
2201
sigemptyset(&sigterm_action.sa_mask);
2202
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2204
perror_plus("sigaddset");
2205
exitcode = EX_OSERR;
2208
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2210
perror_plus("sigaddset");
2211
exitcode = EX_OSERR;
2214
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2216
perror_plus("sigaddset");
2217
exitcode = EX_OSERR;
2220
/* Need to check if the handler is SIG_IGN before handling:
2221
| [[info:libc:Initial Signal Actions]] |
2222
| [[info:libc:Basic Signal Handling]] |
2224
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2226
perror_plus("sigaction");
2229
if(old_sigterm_action.sa_handler != SIG_IGN){
2230
ret = sigaction(SIGINT, &sigterm_action, NULL);
2232
perror_plus("sigaction");
2233
exitcode = EX_OSERR;
2237
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2239
perror_plus("sigaction");
2242
if(old_sigterm_action.sa_handler != SIG_IGN){
2243
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2245
perror_plus("sigaction");
2246
exitcode = EX_OSERR;
2250
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2252
perror_plus("sigaction");
2255
if(old_sigterm_action.sa_handler != SIG_IGN){
2256
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2258
perror_plus("sigaction");
2259
exitcode = EX_OSERR;
2264
/* If no interfaces were specified, make a list */
2265
if(mc.interfaces == NULL){
2266
struct dirent **direntries = NULL;
2267
/* Look for any good interfaces */
2268
ret = scandir(sys_class_net, &direntries, good_interface,
2271
/* Add all found interfaces to interfaces list */
2272
for(int i = 0; i < ret; ++i){
2273
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2274
direntries[i]->d_name);
2277
perror_plus("argz_add");
2281
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2282
direntries[i]->d_name);
2290
fprintf_plus(stderr, "Could not find a network interface\n");
2291
exitcode = EXIT_FAILURE;
2296
/* Bring up interfaces which are down, and remove any "none"s */
2298
char *interface = NULL;
2299
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2301
/* If interface name is "none", stop bringing up interfaces.
2302
Also remove all instances of "none" from the list */
2303
if(strcmp(interface, "none") == 0){
2304
argz_delete(&mc.interfaces, &mc.interfaces_size,
2307
while((interface = argz_next(mc.interfaces,
2308
mc.interfaces_size, interface))){
2309
if(strcmp(interface, "none") == 0){
2310
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){
2317
bool interface_was_up = interface_is_up(interface);
2318
errno = bring_up_interface(interface, delay);
2319
if(not interface_was_up){
2321
perror_plus("Failed to bring up interface");
2323
errno = argz_add(&interfaces_to_take_down,
2324
&interfaces_to_take_down_size,
2327
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");
2332
if(debug and (interfaces_to_take_down == NULL)){
2333
fprintf_plus(stderr, "No interfaces were brought up\n");
2337
/* If we only got one interface, explicitly use only that one */
2338
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2340
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2343
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2350
ret = init_gnutls_global(pubkey, seckey, &mc);
2352
fprintf_plus(stderr, "init_gnutls_global failed\n");
2353
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;
2356
1043
gnutls_initialized = true;
2363
/* Try /run/tmp before /tmp */
2364
tempdir = mkdtemp(run_tempdir);
2365
if(tempdir == NULL and errno == ENOENT){
2367
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2368
run_tempdir, old_tempdir);
2370
tempdir = mkdtemp(old_tempdir);
2372
if(tempdir == NULL){
2373
perror_plus("mkdtemp");
2381
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2382
fprintf_plus(stderr, "init_gpgme failed\n");
2383
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;
2386
1057
gpgme_initialized = true;
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
2550
1179
gpgme_release(mc.ctx);
2553
/* Cleans up the circular linked list of Mandos servers the client
2555
if(mc.current_server != NULL){
2556
mc.current_server->prev->next = NULL;
2557
while(mc.current_server != NULL){
2558
server *next = mc.current_server->next;
2560
#pragma GCC diagnostic push
2561
#pragma GCC diagnostic ignored "-Wcast-qual"
2563
free((char *)(mc.current_server->ip));
2565
#pragma GCC diagnostic pop
2567
free(mc.current_server);
2568
mc.current_server = next;
2572
/* Re-raise privileges */
2574
ret_errno = raise_privileges();
2577
perror_plus("Failed to raise privileges");
2580
/* Run network hooks */
2581
run_network_hooks("stop", interfaces_hooks != NULL ?
2582
interfaces_hooks : "", delay);
2584
/* Take down the network interfaces which were brought up */
2586
char *interface = NULL;
2587
while((interface=argz_next(interfaces_to_take_down,
2588
interfaces_to_take_down_size,
2590
ret_errno = take_down_interface(interface);
2593
perror_plus("Failed to take down interface");
2596
if(debug and (interfaces_to_take_down == NULL)){
2597
fprintf_plus(stderr, "No interfaces needed to be taken"
2603
ret_errno = lower_privileges_permanently();
2606
perror_plus("Failed to lower privileges permanently");
2610
free(interfaces_to_take_down);
2611
free(interfaces_hooks);
2613
/* Removes the GPGME temp directory and all files inside */
2614
if(tempdir != NULL){
2615
struct dirent **direntries = NULL;
2616
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2618
if(tempdir_fd == -1){
2619
perror_plus("open");
2622
#if __GLIBC_PREREQ(2, 15)
2623
int numentries = scandirat(tempdir_fd, ".", &direntries,
2624
notdotentries, alphasort);
2625
#else /* not __GLIBC_PREREQ(2, 15) */
2626
int numentries = scandir(tempdir, &direntries, notdotentries,
2628
#endif /* not __GLIBC_PREREQ(2, 15) */
2629
#else /* not __GLIBC__ */
2630
int numentries = scandir(tempdir, &direntries, notdotentries,
2632
#endif /* not __GLIBC__ */
2633
if(numentries >= 0){
2634
for(int i = 0; i < numentries; i++){
2635
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2637
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2638
" \"%s\", 0): %s\n", tempdir,
2639
direntries[i]->d_name, strerror(errno));
2643
/* need to clean even if 0 because man page doesn't specify */
2645
if(numentries == -1){
2646
perror_plus("scandir");
2648
ret = rmdir(tempdir);
2649
if(ret == -1 and errno != ENOENT){
2650
perror_plus("rmdir");
2653
TEMP_FAILURE_RETRY(close(tempdir_fd));
2658
sigemptyset(&old_sigterm_action.sa_mask);
2659
old_sigterm_action.sa_handler = SIG_DFL;
2660
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2661
&old_sigterm_action,
2664
perror_plus("sigaction");
2667
ret = raise(signal_received);
2668
} while(ret != 0 and errno == EINTR);
2670
perror_plus("raise");
2673
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){
2676
1226
return exitcode;