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74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
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#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
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#include <iso646.h> /* not, or, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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EX_NOHOST, EX_IOERR, EX_PROTOCOL */
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#include <sys/wait.h> /* waitpid(), WIFEXITED(),
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WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
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#include <sys/klog.h> /* klogctl() */
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/* Function to use when printing errors */
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void perror_plus(const char *print_text){
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fprintf(stderr, "Mandos plugin %s: ",
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program_invocation_short_name);
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perror(print_text);
180
__attribute__((format (gnu_printf, 2, 3)))
181
177
int fprintf_plus(FILE *stream, const char *format, ...){
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va_start (ap, format);
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203
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
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207
server *new_server = malloc(sizeof(server));
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if(new_server == NULL){
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perror_plus("malloc");
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*new_server = (server){ .ip = strdup(ip),
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1030
avahi_simple_poll_quit(mc.simple_poll);
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
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ret = add_server(ip, port, interface,
1033
avahi_proto_to_af(proto));
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1389
int devnull = open("/dev/null", O_RDONLY);
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1390
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1391
direntry = direntries[0];
1403
1392
char *fullname = NULL;
1404
1393
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1406
1395
perror_plus("asprintf");
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
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1398
pid_t hook_pid = fork();
1414
1399
if(hook_pid == 0){
1416
/* Raise privileges */
1420
perror_plus("seteuid");
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/* Raise privileges even more */
1426
perror_plus("setuid");
1432
perror_plus("setgid");
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/* Reset supplementary groups */
1436
ret = setgroups(0, NULL);
1438
perror_plus("setgroups");
1440
1401
dup2(devnull, STDIN_FILENO);
1441
1402
close(devnull);
1442
1403
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
1404
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1445
1406
perror_plus("setenv");
1448
1409
ret = setenv("DEVICE", interface, 1);
1450
1411
perror_plus("setenv");
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
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ret = setenv("VERBOSE", debug ? "1" : "0", 1);
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1416
perror_plus("setenv");
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1419
ret = setenv("MODE", mode, 1);
1460
1421
perror_plus("setenv");
1463
1424
char *delaystring;
1464
1425
ret = asprintf(&delaystring, "%f", delay);
1466
1427
perror_plus("asprintf");
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ret = setenv("DELAY", delaystring, 1);
1471
1432
free(delaystring);
1472
1433
perror_plus("setenv");
1475
1436
free(delaystring);
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if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to);
1479
perror_plus("setenv");
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1437
ret = execl(fullname, direntry->d_name, mode, NULL);
1438
perror_plus("execl");
1489
1441
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1609
1560
{ .name = "retry", .key = 132,
1610
1561
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1562
.doc = "Retry interval used when denied by the mandos server",
1613
1564
{ .name = "network-hook-dir", .key = 133,
1686
1637
argp_state_help(state, state->out_stream,
1687
1638
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
1639
case 'V': /* --version */
1640
fprintf_plus(state->out_stream,
1641
"Mandos plugin mandos-client: ");
1689
1642
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1690
1643
exit(argp_err_exit_status);
1720
1673
/* Work around Debian bug #633582:
1721
1674
<http://bugs.debian.org/633582> */
1723
1677
/* Re-raise priviliges */
1725
1679
ret = seteuid(0);
1727
1681
perror_plus("seteuid");
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1738
perror_plus("fstat");
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1744
perror_plus("fchown");
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1759
perror_plus("fstat");
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1765
perror_plus("fchown");
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1773
/* Lower privileges */
1777
perror_plus("seteuid");
1684
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1685
int seckey_fd = open(seckey, O_RDONLY);
1686
if(seckey_fd == -1){
1687
perror_plus("open");
1689
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1691
perror_plus("fstat");
1693
if(S_ISREG(st.st_mode)
1694
and st.st_uid == 0 and st.st_gid == 0){
1695
ret = fchown(seckey_fd, uid, gid);
1697
perror_plus("fchown");
1701
TEMP_FAILURE_RETRY(close(seckey_fd));
1705
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1706
int pubkey_fd = open(pubkey, O_RDONLY);
1707
if(pubkey_fd == -1){
1708
perror_plus("open");
1710
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1712
perror_plus("fstat");
1714
if(S_ISREG(st.st_mode)
1715
and st.st_uid == 0 and st.st_gid == 0){
1716
ret = fchown(pubkey_fd, uid, gid);
1718
perror_plus("fchown");
1722
TEMP_FAILURE_RETRY(close(pubkey_fd));
1726
/* Lower privileges */
1730
perror_plus("seteuid");
1782
1734
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1736
/* Re-raise priviliges */
1740
perror_plus("seteuid");
1742
if(not run_network_hooks("start", interface, delay)){
1745
/* Lower privileges */
1749
perror_plus("seteuid");