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/* vim: set expandtab ts=4 sw=4: */
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <>.
#define _GNU_SOURCE // chroot(), MAP_ANONYMOUS
#include "benc/Dict.h"
#include "benc/String.h"
#include "exception/Except.h"
#include "util/log/Log.h"
#include "util/Security.h"
#include "util/Seccomp.h"
#include "memory/Allocator.h"
#include "util/Bits.h"
#include "util/Setuid.h"
#include "util/events/EventBase.h"
#include "util/events/Timeout.h"
#include <sys/resource.h>
#include <sys/types.h>
#include <pwd.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <stdio.h>
Dict* Security_getUser(char* userName, struct Allocator* retAlloc)
struct passwd* pw;
if (userName) {
pw = getpwnam(userName);
} else {
pw = getpwuid(getuid());
Dict* ret = Dict_new(retAlloc);
if (!pw) {
Dict_putString(ret, String_new("error", retAlloc),
String_printf(retAlloc, "Could not find user [%s]", strerror(errno)),
return ret;
Dict_putString(ret, String_new("error", retAlloc), String_new("none", retAlloc), retAlloc);
Dict_putString(ret, String_new("name", retAlloc), String_new(pw->pw_name, retAlloc), retAlloc);
Dict_putInt(ret, String_new("uid", retAlloc), pw->pw_uid, retAlloc);
Dict_putInt(ret, String_new("gid", retAlloc), pw->pw_gid, retAlloc);
return ret;
void Security_setUser(int uid,
int gid,
bool keepNetAdmin,
struct Log* logger,
struct Except* eh,
struct Allocator* alloc)
int gidErrno = 0;
int uidErrno = 0;
if (keepNetAdmin) {
Setuid_preSetuid(alloc, eh);
if (gid && setgid(gid)) {
gidErrno = errno;
if (setuid(uid)) {
// errno is global and could get overwritten by Setuid_postSetuid()
uidErrno = errno;
if (keepNetAdmin) {
Setuid_postSetuid(alloc, eh);
if (uidErrno > 0) {
Except_throw(eh, "Failed to set UID [%s]", strerror(uidErrno));
if (uid != (int) getuid()) {
Except_throw(eh, "Failed to set UID but seemed to succeed");
if (gidErrno > 0) {
Except_throw(eh, "Failed to set GID [%s]", strerror(gidErrno));
if (gid != (int) getgid()) {
Except_throw(eh, "Failed to set GID but seemed to succeed");
static int canOpenFiles()
int file = dup(0);
return file >= 0;
void Security_nofiles(struct Except* eh)
#if !defined(RLIMIT_NOFILE) && defined(RLIMIT_OFILE)
if (!canOpenFiles()) {
Except_throw(eh, "Unable to dupe stdin");
if (setrlimit(RLIMIT_NOFILE, &(struct rlimit){ 0, 0 })) {
Except_throw(eh, "Failed to set open file limit to 0 [%s]", strerror(errno));
if (canOpenFiles()) {
Except_throw(eh, "Still able to dupe stdin after setting number of files to 0!");
void Security_noforks(struct Except* eh)
if (setrlimit(RLIMIT_NPROC, &(struct rlimit){ 0, 0 })) {
Except_throw(eh, "Failed to set fork limit to 0 [%s]", strerror(errno));
void Security_chroot(char* root, struct Except* eh)
if (chdir(root)) {
Except_throw(eh, "chdir(%s) -> [%s]", root, strerror(errno));
if (chroot(root)) {
Except_throw(eh, "chroot(%s) -> [%s]", root, strerror(errno));
void Security_seccomp(struct Allocator* tempAlloc, struct Log* logger, struct Except* eh)
Seccomp_dropPermissions(tempAlloc, logger, eh);
struct Security_pvt
struct Security pub;
struct Allocator* setupAlloc;
struct Log* log;
void Security_setupComplete(struct Security* security)
struct Security_pvt* sec = Identity_check((struct Security_pvt*) security);
sec->pub.setupComplete = 1;
static void fail(void* vSec)
struct Security_pvt* sec = Identity_check((struct Security_pvt*) vSec);
Log_critical(sec->log, "Security_setupComplete() not called in time, exiting");
struct Security* Security_new(struct Allocator* alloc, struct Log* log, struct EventBase* base)
struct Security_pvt* sec = Allocator_calloc(alloc, sizeof(struct Security_pvt), 1);
sec->setupAlloc = Allocator_child(alloc);
Timeout_setInterval(fail, sec, 20000, base, sec->setupAlloc);
sec->log = log;
return &sec->pub;
struct Security_Permissions* Security_checkPermissions(struct Allocator* alloc, struct Except* eh)
struct Security_Permissions* out =
Allocator_calloc(alloc, sizeof(struct Security_Permissions), 1);
out->noOpenFiles = !canOpenFiles();
out->seccompExists = Seccomp_exists();
out->seccompEnforcing = Seccomp_isWorking();
out->uid = getuid();
return out;
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