9
9
* "browse_callback", and parts of "main".
11
11
* Everything else is
12
* Copyright © 2008-2014 Teddy Hogeborn
13
* Copyright © 2008-2014 Björn Påhlsson
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 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
56
56
#include <sys/stat.h> /* open(), S_ISREG */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
58
inet_pton(), connect() */
60
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
74
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
74
getuid(), getgid(), seteuid(),
76
75
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons() */
76
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
77
#include <iso646.h> /* not, or, and */
79
78
#include <argp.h> /* struct argp_option, error_t, struct
80
79
argp_state, struct argp,
92
91
argz_delete(), argz_append(),
93
92
argz_stringify(), argz_add(),
95
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
96
EAI_SYSTEM, gai_strerror() */
99
96
#include <sys/klog.h> /* klogctl() */
183
178
perror(print_text);
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
181
__attribute__((format (gnu_printf, 2, 3)))
187
182
int fprintf_plus(FILE *stream, const char *format, ...){
189
184
va_start (ap, format);
191
186
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
187
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
198
193
* bytes. "buffer_capacity" is how much is currently allocated,
199
194
* "buffer_length" is how much is already used.
201
__attribute__((nonnull, warn_unused_result))
202
196
size_t incbuffer(char **buffer, size_t buffer_length,
203
197
size_t buffer_capacity){
204
198
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
int old_errno = errno;
199
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
203
buffer_capacity += BUFFER_SIZE;
216
205
return buffer_capacity;
219
208
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
209
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
210
int af, server **current_server){
234
222
perror_plus("strdup");
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
perror_plus("clock_gettime");
242
225
/* Special case of first server */
243
226
if(*current_server == NULL){
244
227
new_server->next = new_server;
245
228
new_server->prev = new_server;
246
229
*current_server = new_server;
230
/* Place the new server last in the list */
248
/* Place the new server last in the list */
249
232
new_server->next = *current_server;
250
233
new_server->prev = (*current_server)->prev;
251
234
new_server->prev->next = new_server;
252
235
(*current_server)->prev = new_server;
237
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
239
perror_plus("clock_gettime");
258
246
* Initialize GPGME.
260
__attribute__((nonnull, warn_unused_result))
261
static bool init_gpgme(const char * const seckey,
262
const char * const pubkey,
263
const char * const tempdir,
248
static bool init_gpgme(const char *seckey, const char *pubkey,
249
const char *tempdir, mandos_context *mc){
265
250
gpgme_error_t rc;
266
251
gpgme_engine_info_t engine_info;
269
254
* Helper function to insert pub and seckey to the engine keyring.
271
bool import_key(const char * const filename){
256
bool import_key(const char *filename){
274
259
gpgme_data_t pgp_data;
492
475
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
476
static void debuggnutls(__attribute__((unused)) int level,
495
477
const char* string){
496
478
fprintf_plus(stderr, "GnuTLS: %s", string);
499
__attribute__((nonnull, warn_unused_result))
500
481
static int init_gnutls_global(const char *pubkeyfilename,
501
482
const char *seckeyfilename,
502
483
mandos_context *mc){
639
619
__attribute__((unused)) const char *txt){}
641
621
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
622
static int start_mandos_communication(const char *ip, in_port_t port,
644
623
AvahiIfIndex if_index,
645
624
int af, mandos_context *mc){
646
625
int ret, tcp_sd = -1;
648
struct sockaddr_storage to;
628
struct sockaddr_in in;
629
struct sockaddr_in6 in6;
649
631
char *buffer = NULL;
650
632
char *decrypted_buffer = NULL;
651
633
size_t buffer_length = 0;
678
/* If the interface is specified and we have a list of interfaces */
679
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
680
/* Check if the interface is one of the interfaces we are using */
683
char *interface = NULL;
684
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
686
if(if_nametoindex(interface) == (unsigned int)if_index){
693
/* This interface does not match any in the list, so we don't
694
connect to the server */
696
char interface[IF_NAMESIZE];
697
if(if_indextoname((unsigned int)if_index, interface) == NULL){
698
perror_plus("if_indextoname");
700
fprintf_plus(stderr, "Skipping server on non-used interface"
702
if_indextoname((unsigned int)if_index,
710
660
ret = init_gnutls_session(&session, mc);
733
683
memset(&to, 0, sizeof(to));
734
684
if(af == AF_INET6){
735
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
736
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
685
to.in6.sin6_family = (sa_family_t)af;
686
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
687
} else { /* IPv4 */
738
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
739
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
688
to.in.sin_family = (sa_family_t)af;
689
ret = inet_pton(af, ip, &to.in.sin_addr);
753
703
if(af == AF_INET6){
754
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
755
if(IN6_IS_ADDR_LINKLOCAL
756
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
704
to.in6.sin6_port = htons(port);
705
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
706
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
757
708
if(if_index == AVAHI_IF_UNSPEC){
758
709
fprintf_plus(stderr, "An IPv6 link-local address is"
759
710
" incomplete without a network interface\n");
788
741
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
742
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
790
744
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
745
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
796
ret = getnameinfo((struct sockaddr *)&to,
797
sizeof(struct sockaddr_in),
798
addrstr, sizeof(addrstr), NULL, 0,
748
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
801
if(ret == EAI_SYSTEM){
802
perror_plus("getnameinfo");
803
} else if(ret != 0) {
804
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
805
} else if(strcmp(addrstr, ip) != 0){
806
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
752
perror_plus("inet_ntop");
754
if(strcmp(addrstr, ip) != 0){
755
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
815
765
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
766
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
768
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
773
perror_plus("connect");
1512
1447
return ret_errno;
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1450
bool run_network_hooks(const char *mode, const char *interface,
1517
1451
const float delay){
1518
1452
struct dirent **direntries;
1453
struct dirent *direntry;
1519
1455
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
1457
if(numhooks == -1){
1547
1481
if(hook_pid == 0){
1549
1483
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1484
raise_privileges_permanently();
1554
1485
/* Set group */
1556
1487
ret = setgid(0);
1558
1489
perror_plus("setgid");
1561
1491
/* Reset supplementary groups */
1563
1493
ret = setgroups(0, NULL);
1565
1495
perror_plus("setgroups");
1568
ret = dup2(devnull, STDIN_FILENO);
1570
perror_plus("dup2(devnull, STDIN_FILENO)");
1573
ret = close(devnull);
1575
perror_plus("close");
1578
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1580
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1497
dup2(devnull, STDIN_FILENO);
1499
dup2(STDERR_FILENO, STDOUT_FILENO);
1583
1500
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
1502
perror_plus("setenv");
1683
1602
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1603
if(not get_flags(interface, &network) and debug){
1686
1604
ret_errno = errno;
1687
1605
fprintf_plus(stderr, "Failed to get flags for interface "
1688
1606
"\"%s\"\n", interface);
1690
1607
return ret_errno;
1692
network.ifr_flags |= IFF_UP; /* set flag */
1609
network.ifr_flags |= IFF_UP;
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1611
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1696
1613
ret_errno = errno;
1697
1614
perror_plus("socket");
1698
1615
errno = old_errno;
1699
1616
return ret_errno;
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
perror_plus("close");
1707
1621
errno = old_errno;
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1719
perror_plus("Failed to raise privileges");
1630
/* Raise priviliges */
1722
1633
#ifdef __linux__
1724
bool restore_loglevel = false;
1726
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1727
messages about the network interface to mess up the prompt */
1728
ret_linux = klogctl(8, NULL, 5);
1729
if(ret_linux == -1){
1730
perror_plus("klogctl");
1732
restore_loglevel = true;
1634
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1635
messages about the network interface to mess up the prompt */
1636
int ret_linux = klogctl(8, NULL, 5);
1637
bool restore_loglevel = true;
1638
if(ret_linux == -1){
1639
restore_loglevel = false;
1640
perror_plus("klogctl");
1735
1642
#endif /* __linux__ */
1736
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
ioctl_errno = errno;
1643
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1738
1645
#ifdef __linux__
1739
1646
if(restore_loglevel){
1740
1647
ret_linux = klogctl(7, NULL, 0);
1801
1703
if(interface_is_up(interface)){
1802
error_t ret_errno = 0, ioctl_errno = 0;
1803
1704
if(not get_flags(interface, &network) and debug){
1804
1705
ret_errno = errno;
1805
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1806
1707
"\"%s\"\n", interface);
1808
1708
return ret_errno;
1810
1710
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1812
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1712
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1814
1714
ret_errno = errno;
1815
1715
perror_plus("socket");
1816
1716
errno = old_errno;
1825
/* Raise privileges */
1826
ret_errno = raise_privileges();
1828
perror_plus("Failed to raise privileges");
1831
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1832
ioctl_errno = errno;
1834
/* If raise_privileges() succeeded above */
1836
/* Lower privileges */
1837
ret_errno = lower_privileges();
1840
perror_plus("Failed to lower privileges");
1725
/* Raise priviliges */
1728
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1731
/* Lower privileges */
1844
1734
/* Close the socket */
1845
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1735
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1847
1737
perror_plus("close");
1850
1740
if(ret_setflags == -1){
1851
errno = ioctl_errno;
1852
1742
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1853
1743
errno = old_errno;
1856
1746
} else if(debug){
1857
1747
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1865
1755
int main(int argc, char *argv[]){
1866
1756
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1867
1757
.priority = "SECURE256:!CTYPE-X.509:"
1868
"+CTYPE-OPENPGP", .current_server = NULL,
1869
.interfaces = NULL, .interfaces_size = 0 };
1758
"+CTYPE-OPENPGP", .current_server = NULL };
1870
1759
AvahiSServiceBrowser *sb = NULL;
1871
1760
error_t ret_errno;
1873
1762
intmax_t tmpmax;
1875
1764
int exitcode = EXIT_SUCCESS;
1765
char *interfaces = NULL;
1766
size_t interfaces_size = 0;
1876
1767
char *interfaces_to_take_down = NULL;
1877
1768
size_t interfaces_to_take_down_size = 0;
1878
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1879
char old_tempdir[] = "/tmp/mandosXXXXXX";
1880
char *tempdir = NULL;
1769
char tempdir[] = "/tmp/mandosXXXXXX";
1770
bool tempdir_created = false;
1881
1771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1882
1772
const char *seckey = PATHDIR "/" SECKEY;
1883
1773
const char *pubkey = PATHDIR "/" PUBKEY;
1884
1774
char *interfaces_hooks = NULL;
1775
size_t interfaces_hooks_size = 0;
1886
1777
bool gnutls_initialized = false;
1887
1778
bool gpgme_initialized = false;
1978
1869
connect_to = arg;
1980
1871
case 'i': /* --interface */
1981
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1872
ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,
1983
1874
if(ret_errno != 0){
1984
1875
argp_error(state, "%s", strerror(ret_errno));
2065
1956
/* Work around Debian bug #633582:
2066
1957
<http://bugs.debian.org/633582> */
2068
/* Re-raise privileges */
2069
ret_errno = raise_privileges();
2072
perror_plus("Failed to raise privileges");
1959
/* Re-raise priviliges */
1960
if(raise_privileges() == 0){
2074
1961
struct stat st;
2076
1963
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2118
2005
/* Lower privileges */
2119
ret_errno = lower_privileges();
2122
perror_plus("Failed to lower privileges");
2009
perror_plus("seteuid");
2127
/* Remove invalid interface names (except "none") */
2014
/* Remove empty interface names */
2129
2016
char *interface = NULL;
2130
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2017
while((interface = argz_next(interfaces, interfaces_size,
2132
if(strcmp(interface, "none") != 0
2133
and if_nametoindex(interface) == 0){
2134
if(interface[0] != '\0'){
2019
if(if_nametoindex(interface) == 0){
2020
if(interface[0] != '\0' and strcmp(interface, "none") != 0){
2135
2021
fprintf_plus(stderr, "Not using nonexisting interface"
2136
2022
" \"%s\"\n", interface);
2138
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2024
argz_delete(&interfaces, &interfaces_size, interface);
2139
2025
interface = NULL;
2144
2030
/* Run network hooks */
2146
if(mc.interfaces != NULL){
2147
interfaces_hooks = malloc(mc.interfaces_size);
2033
if(interfaces != NULL){
2034
interfaces_hooks = malloc(interfaces_size);
2148
2035
if(interfaces_hooks == NULL){
2149
2036
perror_plus("malloc");
2152
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2153
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2155
run_network_hooks("start", interfaces_hooks != NULL ?
2156
interfaces_hooks : "", delay);
2039
memcpy(interfaces_hooks, interfaces, interfaces_size);
2040
interfaces_hooks_size = interfaces_size;
2041
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2044
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2045
interfaces_hooks : "", delay)){
2238
2129
/* If no interfaces were specified, make a list */
2239
if(mc.interfaces == NULL){
2130
if(interfaces == NULL){
2240
2131
struct dirent **direntries;
2241
2132
/* Look for any good interfaces */
2242
2133
ret = scandir(sys_class_net, &direntries, good_interface,
2268
/* Bring up interfaces which are down, and remove any "none"s */
2158
/* If we only got one interface, explicitly use only that one */
2159
if(argz_count(interfaces, interfaces_size) == 1){
2161
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2164
if_index = (AvahiIfIndex)if_nametoindex(interfaces);
2167
/* Bring up interfaces which are down */
2168
if(not (argz_count(interfaces, interfaces_size) == 1
2169
and strcmp(interfaces, "none") == 0)){
2270
2170
char *interface = NULL;
2271
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2171
while((interface = argz_next(interfaces, interfaces_size,
2273
/* If interface name is "none", stop bringing up interfaces.
2274
Also remove all instances of "none" from the list */
2275
if(strcmp(interface, "none") == 0){
2276
argz_delete(&mc.interfaces, &mc.interfaces_size,
2279
while((interface = argz_next(mc.interfaces,
2280
mc.interfaces_size, interface))){
2281
if(strcmp(interface, "none") == 0){
2282
argz_delete(&mc.interfaces, &mc.interfaces_size,
2289
2173
bool interface_was_up = interface_is_up(interface);
2290
errno = bring_up_interface(interface, delay);
2174
ret = bring_up_interface(interface, delay);
2291
2175
if(not interface_was_up){
2293
2178
perror_plus("Failed to bring up interface");
2295
errno = argz_add(&interfaces_to_take_down,
2296
&interfaces_to_take_down_size,
2299
perror_plus("argz_add");
2180
ret_errno = argz_add(&interfaces_to_take_down,
2181
&interfaces_to_take_down_size,
2188
interfaces_size = 0;
2304
2189
if(debug and (interfaces_to_take_down == NULL)){
2305
2190
fprintf_plus(stderr, "No interfaces were brought up\n");
2309
/* If we only got one interface, explicitly use only that one */
2310
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2312
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2315
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2335
/* Try /run/tmp before /tmp */
2336
tempdir = mkdtemp(run_tempdir);
2337
if(tempdir == NULL and errno == ENOENT){
2339
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2340
run_tempdir, old_tempdir);
2342
tempdir = mkdtemp(old_tempdir);
2344
if(tempdir == NULL){
2211
if(mkdtemp(tempdir) == NULL){
2345
2212
perror_plus("mkdtemp");
2215
tempdir_created = true;
2536
/* Re-raise privileges */
2402
/* Re-raise priviliges */
2538
ret_errno = raise_privileges();
2540
perror_plus("Failed to raise privileges");
2543
/* Run network hooks */
2544
run_network_hooks("stop", interfaces_hooks != NULL ?
2545
interfaces_hooks : "", delay);
2547
/* Take down the network interfaces which were brought up */
2549
char *interface = NULL;
2550
while((interface=argz_next(interfaces_to_take_down,
2551
interfaces_to_take_down_size,
2553
ret_errno = take_down_interface(interface);
2556
perror_plus("Failed to take down interface");
2559
if(debug and (interfaces_to_take_down == NULL)){
2560
fprintf_plus(stderr, "No interfaces needed to be taken"
2566
ret_errno = lower_privileges_permanently();
2568
perror_plus("Failed to lower privileges permanently");
2406
/* Run network hooks */
2407
run_network_hooks("stop", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
2410
/* Take down the network interfaces which were brought up */
2412
char *interface = NULL;
2413
while((interface=argz_next(interfaces_to_take_down,
2414
interfaces_to_take_down_size,
2416
ret_errno = take_down_interface(interface);
2419
perror_plus("Failed to take down interface");
2422
if(debug and (interfaces_to_take_down == NULL)){
2423
fprintf_plus(stderr, "No interfaces needed to be taken"
2428
lower_privileges_permanently();
2572
2431
free(interfaces_to_take_down);
2573
2432
free(interfaces_hooks);
2575
2434
/* Removes the GPGME temp directory and all files inside */
2576
if(tempdir != NULL){
2435
if(tempdir_created){
2577
2436
struct dirent **direntries = NULL;
2578
2437
struct dirent *direntry = NULL;
2579
2438
int numentries = scandir(tempdir, &direntries, notdotentries,
2440
if (numentries > 0){
2582
2441
for(int i = 0; i < numentries; i++){
2583
2442
direntry = direntries[i];
2584
2443
char *fullname = NULL;