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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <syslog.h>
#include <pwd.h>
#include <selinux/selinux.h>
int permanent = 0;
int setbool(char **list, int start, int end);
void rollback(char *list[], int start, int end);
void usage(void)
{
fputs("\nUsage: setsebool [ -P ] boolean value | bool1=val1 bool2=val2...\n\n", stderr);
exit(1);
}
int main(int argc, char **argv)
{
int rc, start;
if (argc < 2)
usage();
if (is_selinux_enabled() <= 0) {
fputs("setsebool: SELinux is disabled.\n", stderr);
return 1;
}
if (strcmp(argv[1], "-P") == 0) {
permanent = 1;
if (argc < 3)
usage();
start = 2;
}
else
start = 1;
/* Check to see which way we are being called. If a '=' is passed,
we'll enforce the list syntax. If not we'll enforce the original
syntax for backward compatibility. */
if (strchr(argv[start], '=') == 0) {
int len;
char *bool_list[1];
if ((argc - start) != 2)
usage();
/* Add 1 for the '=' */
len = strlen(argv[start]) + strlen(argv[start+1]) + 2;
bool_list[0]=(char *)malloc(len);
if (bool_list[0] == 0) {
fputs("Out of memory - aborting\n", stderr);
return 1;
}
snprintf(bool_list[0], len, "%s=%s", argv[start],
argv[start+1]);
rc = setbool(bool_list, 0, 1);
free(bool_list[0]);
}
else
rc = setbool(argv, start, argc);
return rc;
}
/* Given an array of strings in the form "boolname=value", a start index,
and a finish index...walk the list and set the bool. */
int setbool(char **list, int start, int end)
{
char *name, *value_ptr;
int i=start, value;
struct passwd *pwd;
while (i < end) {
name = list[i];
value_ptr = strchr(list[i], '=');
if (value_ptr == 0) {
fprintf(stderr,
"setsebool: '=' not found in boolean expression %s\n",
list[i]);
rollback(list, start, i);
return 4;
}
*value_ptr = 0;
value_ptr++;
if (strcmp(value_ptr, "1") == 0 ||
strcasecmp(value_ptr, "true") == 0)
value = 1;
else if (strcmp(value_ptr, "0") == 0 ||
strcasecmp(value_ptr, "false") == 0)
value = 0;
else {
fprintf(stderr, "setsebool: illegal boolean value %s\n",
value_ptr);
rollback(list, start, i);
return 1;
}
if(security_set_boolean(name, value)) {
fprintf(stderr,
"Error setting boolean %s to value %d (%s)\n",
name, value, strerror(errno));
rollback(list, start, i);
return 2;
}
i++;
/* Now put it back */
value_ptr--;
*value_ptr = '=';
}
/* At this point we know that everything is good. Let's write
the file if the -P option was given. */
if (permanent) {
char **names;
const char *bool_file;
char *tmp_bool_file;
int rc, len, fd, j;
rc = security_get_boolean_names(&names, &len);
if (rc) {
fprintf(stderr,
"Unable to get boolean names: %s\n",
strerror(errno));
rollback(list, start, i);
return 5;
}
if (!len) {
fprintf(stderr,
"Unable to get the boolean list from kernel - exiting\n"
);
rollback(list, start, i);
return 6;
}
/* Open file */
bool_file = selinux_booleans_path();
tmp_bool_file = (char *) alloca (strlen(bool_file) + 8);
strcpy(stpcpy(tmp_bool_file, bool_file), ".XXXXXX");
fd = mkstemp(tmp_bool_file);
if (fd < 0) {
fprintf(stderr,
"Error creating boolean file %s\n",
bool_file);
rollback(list, start, i);
return 7;
}
/* Walk the list in pending memory, writing each to the file */
for (j=0; j<len; j++) {
char val_str[72];
int len;
int pending = security_get_boolean_pending(names[j]);
len = snprintf(val_str, sizeof(val_str), "%s=%d\n",
names[j], pending);
if (write(fd, val_str, len) != len) {
close_remove_fail:
close(fd);
remove_fail:
unlink(tmp_bool_file);
rollback(list, start, i);
return 8;
}
}
if (fchmod(fd, S_IRUSR | S_IWUSR) != 0)
goto close_remove_fail;
close(fd);
if (rename(tmp_bool_file, bool_file) != 0)
goto remove_fail;
syslog(LOG_NOTICE, "%s has been updated.", bool_file);
}
/* OK, let's do the commit */
if (security_commit_booleans()) {
fputs("Error committing booleans\n", stderr);
return 3;
}
/* Now log what was done */
pwd = getpwuid(getuid());
i = start;
while (i < end) {
/* Error checking shouldn't be needed since we just did
this above and aborted if something went wrong. */
name = list[i];
value_ptr = strchr(name, '=');
*value_ptr = 0;
value_ptr++;
if (pwd && pwd->pw_name)
syslog(LOG_NOTICE,
"The %s policy boolean was changed to %s by %s",
name, value_ptr, pwd->pw_name);
else
syslog(LOG_NOTICE,
"The %s policy boolean was changed to %s by uid:%d",
name, value_ptr, getuid());
i++;
}
return 0;
}
void rollback(char *list[], int start, int end)
{
int i;
for(i=start; i<end; i++)
security_set_boolean(list[i],
security_get_boolean_active(list[i]));
}
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