9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
62
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
65
#include <errno.h> /* perror(), errno */
67
66
#include <time.h> /* nanosleep(), time(), sleep() */
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67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <iso646.h> /* not, or, and */
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78
#include <argp.h> /* struct argp_option, error_t, struct
80
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argp_state, struct argp,
151
139
gnutls_dh_params_t dh_params;
152
140
const char *priority;
154
server *current_server;
155
142
} mandos_context;
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144
/* global context so signal handler can reach it*/
158
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mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
146
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
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":!CTYPE-X.509:+CTYPE-OPENPGP" };
163
149
sig_atomic_t quit_now = 0;
164
150
int signal_received = 0;
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
174
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
154
* bytes. "buffer_capacity" is how much is currently allocated,
187
166
return buffer_capacity;
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
200
*new_server = (server){ .ip = strdup(ip),
202
.if_index = if_index,
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
222
perror_plus("clock_gettime");
229
170
* Initialize GPGME.
484
425
/* OpenPGP credentials */
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
486
427
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
488
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safer_gnutls_strerror(ret));
489
433
gnutls_global_deinit();
707
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
652
char interface[IF_NAMESIZE];
709
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
654
perror("if_indextoname");
712
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
657
ip, interface, port);
1093
1032
int good_interface(const struct dirent *if_entry){
1095
1034
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1099
1035
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
1036
if_entry->d_name);
1102
perror_plus("asprintf");
1041
if(if_entry->d_name[0] == '.'){
1105
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
1045
if(flags_fd == -1){
1107
perror_plus("open");
1112
1049
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
1050
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1051
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1115
1052
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
1053
flagstring[(size_t)to_read] = '\0';
1117
1054
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
1056
close(flags_fd);
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1211
if(mc.current_server == NULL){
1214
"Wait until first server is found. No timeout!\n");
1216
ret = avahi_simple_poll_iterate(s, -1);
1219
fprintf(stderr, "Check current_server if we should run it,"
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1225
perror_plus("clock_gettime");
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
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- mc.current_server->last_seen.tv_sec);
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waited_time.tv_nsec = (now.tv_nsec
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- mc.current_server->last_seen.tv_nsec);
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/* total time is 10s/10,000ms.
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Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
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mc.current_server->port,
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mc.current_server->if_index,
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mc.current_server->af);
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avahi_simple_poll_quit(mc.simple_poll);
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ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
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perror_plus("clock_gettime");
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mc.current_server = mc.current_server->next;
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block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
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ret = avahi_simple_poll_iterate(s, (int)block_time);
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
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int main(int argc, char *argv[]){
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1123
AvahiSServiceBrowser *sb = NULL;
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bool gnutls_initialized = false;
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bool gpgme_initialized = false;
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float delay = 2.5f;
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double retry_interval = 10; /* 10s between trying a server and
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retrying the same server again */
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struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
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struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
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if(errno != 0 or tmp == arg or *tmp != '\0'){
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argp_error(state, "Bad delay");
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case 132: /* --retry */
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retry_interval = strtod(arg, &tmp);
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if(errno != 0 or tmp == arg or *tmp != '\0'
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or (retry_interval * 1000) > INT_MAX
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or retry_interval < 0){
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argp_error(state, "Bad retry interval");
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* These reproduce what we would get without ARGP_NO_HELP
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/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
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/* Re-raise priviliges */
1470
perror_plus("seteuid");
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int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1474
if(seckey_fd == -1){
1475
perror_plus("open");
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ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
perror_plus("fstat");
1481
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
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ret = fchown(seckey_fd, uid, gid);
1484
perror_plus("fchown");
1488
TEMP_FAILURE_RETRY(close(seckey_fd));
1491
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1492
if(pubkey_fd == -1){
1493
perror_plus("open");
1495
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1497
perror_plus("fstat");
1499
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1500
ret = fchown(pubkey_fd, uid, gid);
1502
perror_plus("fchown");
1506
TEMP_FAILURE_RETRY(close(pubkey_fd));
1509
/* Lower privileges */
1513
perror_plus("seteuid");
1518
1295
avahi_set_log_function(empty_log);
1557
1334
sigemptyset(&sigterm_action.sa_mask);
1558
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ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1560
perror_plus("sigaddset");
1337
perror("sigaddset");
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exitcode = EX_OSERR;
1564
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ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1566
perror_plus("sigaddset");
1343
perror("sigaddset");
1567
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exitcode = EX_OSERR;
1570
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ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1572
perror_plus("sigaddset");
1349
perror("sigaddset");
1573
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exitcode = EX_OSERR;
1580
1357
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1582
perror_plus("sigaction");
1359
perror("sigaction");
1583
1360
return EX_OSERR;
1585
1362
if(old_sigterm_action.sa_handler != SIG_IGN){
1586
1363
ret = sigaction(SIGINT, &sigterm_action, NULL);
1588
perror_plus("sigaction");
1365
perror("sigaction");
1589
1366
exitcode = EX_OSERR;
1593
1370
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1595
perror_plus("sigaction");
1372
perror("sigaction");
1596
1373
return EX_OSERR;
1598
1375
if(old_sigterm_action.sa_handler != SIG_IGN){
1599
1376
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1601
perror_plus("sigaction");
1378
perror("sigaction");
1602
1379
exitcode = EX_OSERR;
1606
1383
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1608
perror_plus("sigaction");
1385
perror("sigaction");
1609
1386
return EX_OSERR;
1611
1388
if(old_sigterm_action.sa_handler != SIG_IGN){
1612
1389
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1614
perror_plus("sigaction");
1391
perror("sigaction");
1615
1392
exitcode = EX_OSERR;
1665
1442
ret = seteuid(uid);
1667
perror_plus("seteuid");
1671
1448
strcpy(network.ifr_name, interface);
1672
1449
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1674
perror_plus("ioctl SIOCGIFFLAGS");
1451
perror("ioctl SIOCGIFFLAGS");
1675
1452
#ifdef __linux__
1676
1453
if(restore_loglevel){
1677
1454
ret = klogctl(7, NULL, 0);
1679
perror_plus("klogctl");
1682
1459
#endif /* __linux__ */
1695
1472
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1697
1474
take_down_interface = false;
1698
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1475
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1699
1476
exitcode = EX_OSERR;
1700
1477
#ifdef __linux__
1701
1478
if(restore_loglevel){
1702
1479
ret = klogctl(7, NULL, 0);
1704
perror_plus("klogctl");
1707
1484
#endif /* __linux__ */
1710
1487
ret = seteuid(uid);
1712
perror_plus("seteuid");
1717
/* Sleep checking until interface is running.
1718
Check every 0.25s, up to total time of delay */
1494
/* sleep checking until interface is running */
1719
1495
for(int i=0; i < delay * 4; i++){
1720
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1722
perror_plus("ioctl SIOCGIFFLAGS");
1498
perror("ioctl SIOCGIFFLAGS");
1723
1499
} else if(network.ifr_flags & IFF_RUNNING){
1726
1502
struct timespec sleeptime = { .tv_nsec = 250000000 };
1727
1503
ret = nanosleep(&sleeptime, NULL);
1728
1504
if(ret == -1 and errno != EINTR){
1729
perror_plus("nanosleep");
1505
perror("nanosleep");
1732
1508
if(not take_down_interface){
1733
1509
/* We won't need the socket anymore */
1734
1510
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1736
perror_plus("close");
1739
1515
#ifdef __linux__
1832
1609
port = (uint16_t)tmpmax;
1833
1610
*address = '\0';
1611
address = connect_to;
1834
1612
/* Colon in address indicates IPv6 */
1836
if(strchr(connect_to, ':') != NULL){
1614
if(strchr(address, ':') != NULL){
1838
/* Accept [] around IPv6 address - see RFC 5952 */
1839
if(connect_to[0] == '[' and address[-1] == ']')
1847
address = connect_to;
1853
1624
while(not quit_now){
1854
1625
ret = start_mandos_communication(address, port, if_index, af);
1855
1626
if(quit_now or ret == 0){
1859
fprintf(stderr, "Retrying in %d seconds\n",
1860
(int)retry_interval);
1862
sleep((int)retry_interval);
1865
1632
if (not quit_now){
1924
1691
fprintf(stderr, "Starting Avahi loop search\n");
1927
ret = avahi_loop_with_timeout(mc.simple_poll,
1928
(int)(retry_interval * 1000));
1930
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1931
(ret == 0) ? "successfully" : "with error");
1694
avahi_simple_poll_loop(mc.simple_poll);
1956
1718
if(gpgme_initialized){
1957
1719
gpgme_release(mc.ctx);
1960
/* Cleans up the circular linked list of Mandos servers the client
1962
if(mc.current_server != NULL){
1963
mc.current_server->prev->next = NULL;
1964
while(mc.current_server != NULL){
1965
server *next = mc.current_server->next;
1966
free(mc.current_server);
1967
mc.current_server = next;
1971
1722
/* Take down the network interface */
1972
1723
if(take_down_interface){
1975
1726
ret = seteuid(0);
1977
perror_plus("seteuid");
1979
1730
if(geteuid() == 0){
1980
1731
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1982
perror_plus("ioctl SIOCGIFFLAGS");
1733
perror("ioctl SIOCGIFFLAGS");
1983
1734
} else if(network.ifr_flags & IFF_UP) {
1984
1735
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1985
1736
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1987
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1738
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1990
1741
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1992
perror_plus("close");
1994
1745
/* Lower privileges permanently */
1996
1747
ret = setuid(uid);
1998
perror_plus("setuid");
2003
/* Removes the GPGME temp directory and all files inside */
1754
/* Removes the temp directory used by GPGME */
2004
1755
if(tempdir_created){
2005
struct dirent **direntries = NULL;
2006
struct dirent *direntry = NULL;
2007
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
2009
for(int i = 0; i < ret; i++){
2010
direntry = direntries[i];
1757
struct dirent *direntry;
1758
d = opendir(tempdir);
1760
if(errno != ENOENT){
1765
direntry = readdir(d);
1766
if(direntry == NULL){
1769
/* Skip "." and ".." */
1770
if(direntry->d_name[0] == '.'
1771
and (direntry->d_name[1] == '\0'
1772
or (direntry->d_name[1] == '.'
1773
and direntry->d_name[2] == '\0'))){
2011
1776
char *fullname = NULL;
2012
1777
ret = asprintf(&fullname, "%s/%s", tempdir,
2013
1778
direntry->d_name);
2015
perror_plus("asprintf");
2018
1783
ret = remove(fullname);