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
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#include <sys/stat.h> /* open(), S_ISREG */
57
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#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
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argp_state, struct argp,
92
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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() */
137
134
bool debug = false;
138
135
static const char mandos_protocol_version[] = "1";
139
const char * argp_program_version = "mandos-client " VERSION;
140
const char * argp_program_bug_address = "<mandos@recompile.se>";
136
const char *argp_program_version = "mandos-client " VERSION;
137
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
138
static const char sys_class_net[] = "/sys/class/net";
142
139
char *connect_to = NULL;
143
140
const char *hookdir = HOOKDIR;
183
180
perror(print_text);
186
__attribute__((format (gnu_printf, 2, 3), nonnull))
183
__attribute__((format (gnu_printf, 2, 3)))
187
184
int fprintf_plus(FILE *stream, const char *format, ...){
189
186
va_start (ap, format);
191
188
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
189
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
190
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
198
195
* bytes. "buffer_capacity" is how much is currently allocated,
199
196
* "buffer_length" is how much is already used.
201
__attribute__((nonnull, warn_unused_result))
202
198
size_t incbuffer(char **buffer, size_t buffer_length,
203
199
size_t buffer_capacity){
204
200
if(buffer_length + BUFFER_SIZE > buffer_capacity){
205
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
int old_errno = errno;
201
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
205
buffer_capacity += BUFFER_SIZE;
216
207
return buffer_capacity;
219
210
/* Add server to set of servers to retry periodically */
220
__attribute__((nonnull, warn_unused_result))
221
211
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
222
212
int af, server **current_server){
234
224
perror_plus("strdup");
237
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
239
perror_plus("clock_gettime");
242
227
/* Special case of first server */
243
228
if(*current_server == NULL){
244
229
new_server->next = new_server;
245
230
new_server->prev = new_server;
246
231
*current_server = new_server;
232
/* Place the new server last in the list */
248
/* Place the new server last in the list */
249
234
new_server->next = *current_server;
250
235
new_server->prev = (*current_server)->prev;
251
236
new_server->prev->next = new_server;
252
237
(*current_server)->prev = new_server;
239
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
241
perror_plus("clock_gettime");
258
248
* 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,
250
static bool init_gpgme(const char *seckey, const char *pubkey,
251
const char *tempdir, mandos_context *mc){
265
252
gpgme_error_t rc;
266
253
gpgme_engine_info_t engine_info;
269
256
* Helper function to insert pub and seckey to the engine keyring.
271
bool import_key(const char * const filename){
258
bool import_key(const char *filename){
274
261
gpgme_data_t pgp_data;
492
477
/* GnuTLS log function callback */
493
__attribute__((nonnull))
494
478
static void debuggnutls(__attribute__((unused)) int level,
495
479
const char* string){
496
480
fprintf_plus(stderr, "GnuTLS: %s", string);
499
__attribute__((nonnull, warn_unused_result))
500
483
static int init_gnutls_global(const char *pubkeyfilename,
501
484
const char *seckeyfilename,
502
485
mandos_context *mc){
639
621
__attribute__((unused)) const char *txt){}
641
623
/* Called when a Mandos server is found */
642
__attribute__((nonnull, warn_unused_result))
643
624
static int start_mandos_communication(const char *ip, in_port_t port,
644
625
AvahiIfIndex if_index,
645
626
int af, mandos_context *mc){
646
627
int ret, tcp_sd = -1;
648
struct sockaddr_storage to;
630
struct sockaddr_in in;
631
struct sockaddr_in6 in6;
649
633
char *buffer = NULL;
650
634
char *decrypted_buffer = NULL;
651
635
size_t buffer_length = 0;
733
717
memset(&to, 0, sizeof(to));
734
718
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);
719
to.in6.sin6_family = (sa_family_t)af;
720
ret = inet_pton(af, ip, &to.in6.sin6_addr);
737
721
} 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);
722
to.in.sin_family = (sa_family_t)af;
723
ret = inet_pton(af, ip, &to.in.sin_addr);
753
737
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)){
738
to.in6.sin6_port = htons(port);
739
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
740
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
757
742
if(if_index == AVAHI_IF_UNSPEC){
758
743
fprintf_plus(stderr, "An IPv6 link-local address is"
759
744
" incomplete without a network interface\n");
763
748
/* Set the network interface number as scope */
764
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
749
to.in6.sin6_scope_id = (uint32_t)if_index;
767
((struct sockaddr_in *)&to)->sin_port = htons(port);
752
to.in.sin_port = htons(port); /* Spurious warnings from
754
-Wunreachable-code */
788
775
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
789
776
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
790
778
if(af == AF_INET6){
791
ret = getnameinfo((struct sockaddr *)&to,
792
sizeof(struct sockaddr_in6),
793
addrstr, sizeof(addrstr), NULL, 0,
779
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,
782
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);
786
perror_plus("inet_ntop");
788
if(strcmp(addrstr, ip) != 0){
789
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
815
799
if(af == AF_INET6){
816
ret = connect(tcp_sd, (struct sockaddr *)&to,
817
sizeof(struct sockaddr_in6));
800
ret = connect(tcp_sd, &to.in6, sizeof(to));
819
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
820
sizeof(struct sockaddr_in));
802
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
823
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
805
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
825
807
perror_plus("connect");
1253
1232
* corresponds to an acceptable network device.
1254
1233
* (This function is passed to scandir(3) as a filter function.)
1256
__attribute__((nonnull, warn_unused_result))
1257
1235
int good_interface(const struct dirent *if_entry){
1258
1236
if(if_entry->d_name[0] == '.'){
1278
1256
* This function determines if a network interface is up.
1280
__attribute__((nonnull, warn_unused_result))
1281
1258
bool interface_is_up(const char *interface){
1282
1259
struct ifreq ifr;
1283
1260
if(not get_flags(interface, &ifr)){
1295
1272
* This function determines if a network interface is running
1297
__attribute__((nonnull, warn_unused_result))
1298
1274
bool interface_is_running(const char *interface){
1299
1275
struct ifreq ifr;
1300
1276
if(not get_flags(interface, &ifr)){
1308
1284
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1311
__attribute__((nonnull, pure, warn_unused_result))
1312
1287
int notdotentries(const struct dirent *direntry){
1313
1288
/* Skip "." and ".." */
1314
1289
if(direntry->d_name[0] == '.'
1394
1367
if(mc->current_server == NULL){
1396
1369
fprintf_plus(stderr, "Wait until first server is found."
1397
1370
" No timeout!\n");
1399
1372
ret = avahi_simple_poll_iterate(s, -1);
1402
1375
fprintf_plus(stderr, "Check current_server if we should run"
1403
1376
" it, or wait\n");
1449
1422
ret = avahi_simple_poll_iterate(s, (int)block_time);
1452
if(ret > 0 or errno != EINTR){
1425
if (ret > 0 or errno != EINTR){
1453
1426
return (ret != 1) ? ret : 0;
1459
1432
/* Set effective uid to 0, return errno */
1460
__attribute__((warn_unused_result))
1461
1433
error_t raise_privileges(void){
1462
1434
error_t old_errno = errno;
1463
1435
error_t ret_errno = 0;
1472
1444
/* Set effective and real user ID to 0. Return errno. */
1473
__attribute__((warn_unused_result))
1474
1445
error_t raise_privileges_permanently(void){
1475
1446
error_t old_errno = errno;
1476
1447
error_t ret_errno = raise_privileges();
1512
1481
return ret_errno;
1515
__attribute__((nonnull))
1516
void run_network_hooks(const char *mode, const char *interface,
1484
bool run_network_hooks(const char *mode, const char *interface,
1517
1485
const float delay){
1518
1486
struct dirent **direntries;
1487
struct dirent *direntry;
1519
1489
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1521
1491
if(numhooks == -1){
1547
1515
if(hook_pid == 0){
1549
1517
/* Raise privileges */
1550
if(raise_privileges_permanently() != 0){
1551
perror_plus("Failed to raise privileges");
1518
raise_privileges_permanently();
1554
1519
/* Set group */
1556
1521
ret = setgid(0);
1558
1523
perror_plus("setgid");
1561
1525
/* Reset supplementary groups */
1563
1527
ret = setgroups(0, NULL);
1565
1529
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)");
1531
dup2(devnull, STDIN_FILENO);
1533
dup2(STDERR_FILENO, STDOUT_FILENO);
1583
1534
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1585
1536
perror_plus("setenv");
1661
1612
close(devnull);
1665
__attribute__((nonnull, warn_unused_result))
1666
1617
error_t bring_up_interface(const char *const interface,
1667
1618
const float delay){
1668
1620
error_t old_errno = errno;
1621
error_t ret_errno = 0;
1622
int ret, ret_setflags;
1670
1623
struct ifreq network;
1671
1624
unsigned int if_index = if_nametoindex(interface);
1672
1625
if(if_index == 0){
1683
1636
if(not interface_is_up(interface)){
1684
error_t ret_errno = 0, ioctl_errno = 0;
1685
if(not get_flags(interface, &network)){
1637
if(not get_flags(interface, &network) and debug){
1686
1638
ret_errno = errno;
1687
1639
fprintf_plus(stderr, "Failed to get flags for interface "
1688
1640
"\"%s\"\n", interface);
1690
1641
return ret_errno;
1692
network.ifr_flags |= IFF_UP; /* set flag */
1643
network.ifr_flags |= IFF_UP;
1694
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1645
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1696
1647
ret_errno = errno;
1697
1648
perror_plus("socket");
1698
1649
errno = old_errno;
1699
1650
return ret_errno;
1703
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1705
perror_plus("close");
1707
1655
errno = old_errno;
1716
/* Raise privileges */
1717
ret_errno = raise_privileges();
1718
bool restore_loglevel = false;
1720
perror_plus("Failed to raise privileges");
1664
/* Raise priviliges */
1722
1667
#ifdef __linux__
1725
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1726
messages about the network interface to mess up the prompt */
1727
ret_linux = klogctl(8, NULL, 5);
1728
if(ret_linux == -1){
1729
perror_plus("klogctl");
1731
restore_loglevel = true;
1668
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1669
messages about the network interface to mess up the prompt */
1670
int ret_linux = klogctl(8, NULL, 5);
1671
bool restore_loglevel = true;
1672
if(ret_linux == -1){
1673
restore_loglevel = false;
1674
perror_plus("klogctl");
1734
1676
#endif /* __linux__ */
1735
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1736
ioctl_errno = errno;
1677
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1737
1679
#ifdef __linux__
1738
1680
if(restore_loglevel){
1739
1681
ret_linux = klogctl(7, NULL, 0);
1790
__attribute__((nonnull, warn_unused_result))
1791
1725
error_t take_down_interface(const char *const interface){
1792
1727
error_t old_errno = errno;
1728
error_t ret_errno = 0;
1729
int ret, ret_setflags;
1793
1730
struct ifreq network;
1794
1731
unsigned int if_index = if_nametoindex(interface);
1795
1732
if(if_index == 0){
1800
1737
if(interface_is_up(interface)){
1801
error_t ret_errno = 0, ioctl_errno = 0;
1802
1738
if(not get_flags(interface, &network) and debug){
1803
1739
ret_errno = errno;
1804
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1805
1741
"\"%s\"\n", interface);
1807
1742
return ret_errno;
1809
1744
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1811
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1746
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1813
1748
ret_errno = errno;
1814
1749
perror_plus("socket");
1815
1750
errno = old_errno;
1824
/* Raise privileges */
1825
ret_errno = raise_privileges();
1827
perror_plus("Failed to raise privileges");
1829
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1830
ioctl_errno = errno;
1832
/* If raise_privileges() succeeded above */
1834
/* Lower privileges */
1835
ret_errno = lower_privileges();
1838
perror_plus("Failed to lower privileges");
1759
/* Raise priviliges */
1762
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1765
/* Lower privileges */
1842
1768
/* Close the socket */
1843
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1769
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1845
1771
perror_plus("close");
1848
1774
if(ret_setflags == -1){
1849
errno = ioctl_errno;
1850
1776
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1851
1777
errno = old_errno;
1854
1780
} else if(debug){
1855
1781
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1863
1789
int main(int argc, char *argv[]){
1864
1790
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1865
1791
.priority = "SECURE256:!CTYPE-X.509:"
1866
"+CTYPE-OPENPGP", .current_server = NULL,
1792
"+CTYPE-OPENPGP", .current_server = NULL,
1867
1793
.interfaces = NULL, .interfaces_size = 0 };
1868
1794
AvahiSServiceBrowser *sb = NULL;
1869
1795
error_t ret_errno;
1873
1799
int exitcode = EXIT_SUCCESS;
1874
1800
char *interfaces_to_take_down = NULL;
1875
1801
size_t interfaces_to_take_down_size = 0;
1876
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1877
char old_tempdir[] = "/tmp/mandosXXXXXX";
1878
char *tempdir = NULL;
1802
char tempdir[] = "/tmp/mandosXXXXXX";
1803
bool tempdir_created = false;
1879
1804
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1880
1805
const char *seckey = PATHDIR "/" SECKEY;
1881
1806
const char *pubkey = PATHDIR "/" PUBKEY;
1882
1807
char *interfaces_hooks = NULL;
1808
size_t interfaces_hooks_size = 0;
1884
1810
bool gnutls_initialized = false;
1885
1811
bool gpgme_initialized = false;
2063
1989
/* Work around Debian bug #633582:
2064
1990
<http://bugs.debian.org/633582> */
2066
/* Re-raise privileges */
2067
ret_errno = raise_privileges();
2070
perror_plus("Failed to raise privileges");
1992
/* Re-raise priviliges */
1993
if(raise_privileges() == 0){
2072
1994
struct stat st;
2074
1996
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2150
2068
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2151
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2153
run_network_hooks("start", interfaces_hooks != NULL ?
2154
interfaces_hooks : "", delay);
2069
interfaces_hooks_size = mc.interfaces_size;
2070
argz_stringify(interfaces_hooks, interfaces_hooks_size,
2073
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2074
interfaces_hooks : "", delay)){
2287
2208
bool interface_was_up = interface_is_up(interface);
2288
errno = bring_up_interface(interface, delay);
2209
ret = bring_up_interface(interface, delay);
2289
2210
if(not interface_was_up){
2291
2213
perror_plus("Failed to bring up interface");
2293
errno = argz_add(&interfaces_to_take_down,
2294
&interfaces_to_take_down_size,
2297
perror_plus("argz_add");
2215
ret_errno = argz_add(&interfaces_to_take_down,
2216
&interfaces_to_take_down_size,
2333
/* Try /run/tmp before /tmp */
2334
tempdir = mkdtemp(run_tempdir);
2335
if(tempdir == NULL and errno == ENOENT){
2337
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2338
run_tempdir, old_tempdir);
2340
tempdir = mkdtemp(old_tempdir);
2342
if(tempdir == NULL){
2252
if(mkdtemp(tempdir) == NULL){
2343
2253
perror_plus("mkdtemp");
2256
tempdir_created = true;
2534
/* Re-raise privileges */
2445
/* Re-raise priviliges */
2536
ret_errno = raise_privileges();
2538
perror_plus("Failed to raise privileges");
2541
/* Run network hooks */
2542
run_network_hooks("stop", interfaces_hooks != NULL ?
2543
interfaces_hooks : "", delay);
2545
/* Take down the network interfaces which were brought up */
2547
char *interface = NULL;
2548
while((interface=argz_next(interfaces_to_take_down,
2549
interfaces_to_take_down_size,
2551
ret_errno = take_down_interface(interface);
2554
perror_plus("Failed to take down interface");
2557
if(debug and (interfaces_to_take_down == NULL)){
2558
fprintf_plus(stderr, "No interfaces needed to be taken"
2563
ret_errno = lower_privileges_permanently();
2565
perror_plus("Failed to lower privileges permanently");
2449
/* Run network hooks */
2450
run_network_hooks("stop", interfaces_hooks != NULL ?
2451
interfaces_hooks : "", delay);
2453
/* Take down the network interfaces which were brought up */
2455
char *interface = NULL;
2456
while((interface=argz_next(interfaces_to_take_down,
2457
interfaces_to_take_down_size,
2459
ret_errno = take_down_interface(interface);
2462
perror_plus("Failed to take down interface");
2465
if(debug and (interfaces_to_take_down == NULL)){
2466
fprintf_plus(stderr, "No interfaces needed to be taken"
2471
lower_privileges_permanently();
2569
2474
free(interfaces_to_take_down);
2570
2475
free(interfaces_hooks);
2572
2477
/* Removes the GPGME temp directory and all files inside */
2573
if(tempdir != NULL){
2478
if(tempdir_created){
2574
2479
struct dirent **direntries = NULL;
2575
2480
struct dirent *direntry = NULL;
2576
2481
int numentries = scandir(tempdir, &direntries, notdotentries,
2483
if (numentries > 0){
2579
2484
for(int i = 0; i < numentries; i++){
2580
2485
direntry = direntries[i];
2581
2486
char *fullname = NULL;