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/*
htop - SELinuxMeter.c
(C) 2020 htop dev team
Released under the GNU GPLv2+, see the COPYING file
in the source distribution for its full text.
*/
#include "linux/SELinuxMeter.h"
#include "CRT.h"
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/statfs.h>
#include <sys/statvfs.h>
#include "Object.h"
#include "XUtils.h"
static const int SELinuxMeter_attributes[] = {
METER_TEXT,
};
static bool enabled = false;
static bool enforcing = false;
static bool hasSELinuxMount(void) {
struct statfs sfbuf;
int r = statfs("/sys/fs/selinux", &sfbuf);
if (r != 0) {
return false;
}
if ((uint32_t)sfbuf.f_type != /* SELINUX_MAGIC */ 0xf97cff8cU) {
return false;
}
struct statvfs vfsbuf;
r = statvfs("/sys/fs/selinux", &vfsbuf);
if (r != 0 || (vfsbuf.f_flag & ST_RDONLY)) {
return false;
}
return true;
}
static bool isSelinuxEnabled(void) {
return hasSELinuxMount() && (0 == access("/etc/selinux/config", F_OK));
}
static bool isSelinuxEnforcing(void) {
if (!enabled) {
return false;
}
char buf[20];
ssize_t r = xReadfile("/sys/fs/selinux/enforce", buf, sizeof(buf));
if (r < 0)
return false;
int enforce = 0;
if (sscanf(buf, "%d", &enforce) != 1) {
return false;
}
return !!enforce;
}
static void SELinuxMeter_updateValues(Meter* this) {
enabled = isSelinuxEnabled();
enforcing = isSelinuxEnforcing();
xSnprintf(this->txtBuffer, sizeof(this->txtBuffer), "%s%s", enabled ? "enabled" : "disabled", enabled ? (enforcing ? "; mode: enforcing" : "; mode: permissive") : "");
}
const MeterClass SELinuxMeter_class = {
.super = {
.extends = Class(Meter),
.delete = Meter_delete,
},
.updateValues = SELinuxMeter_updateValues,
.defaultMode = TEXT_METERMODE,
.maxItems = 0,
.total = 100.0,
.attributes = SELinuxMeter_attributes,
.name = "SELinux",
.uiName = "SELinux",
.description = "SELinux state overview",
.caption = "SELinux: "
};
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