mirror of https://github.com/trapexit/mergerfs.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
99 lines
2.2 KiB
99 lines
2.2 KiB
/*
|
|
Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
|
|
|
|
Permission to use, copy, modify, and/or distribute this software for any
|
|
purpose with or without fee is hereby granted, provided that the above
|
|
copyright notice and this permission notice appear in all copies.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
#include <pthread.h>
|
|
|
|
namespace mergerfs
|
|
{
|
|
namespace ugid
|
|
{
|
|
extern uid_t currentuid;
|
|
extern gid_t currentgid;
|
|
extern pthread_rwlock_t rwlock;
|
|
|
|
static
|
|
void
|
|
ugid_set(const uid_t newuid,
|
|
const gid_t newgid)
|
|
{
|
|
pthread_rwlock_rdlock(&rwlock);
|
|
|
|
if(newuid == currentuid && newgid == currentgid)
|
|
return;
|
|
|
|
pthread_rwlock_unlock(&rwlock);
|
|
pthread_rwlock_wrlock(&rwlock);
|
|
|
|
if(newuid == currentuid && newgid == currentgid)
|
|
return;
|
|
|
|
if(currentuid != 0)
|
|
{
|
|
::seteuid(0);
|
|
::setegid(0);
|
|
}
|
|
|
|
if(newgid)
|
|
{
|
|
::setegid(newgid);
|
|
initgroups(newuid,newgid);
|
|
}
|
|
|
|
if(newuid)
|
|
::seteuid(newuid);
|
|
|
|
currentuid = newuid;
|
|
currentgid = newgid;
|
|
}
|
|
|
|
struct Set
|
|
{
|
|
Set(const uid_t newuid,
|
|
const gid_t newgid)
|
|
{
|
|
ugid_set(newuid,newgid);
|
|
}
|
|
|
|
~Set()
|
|
{
|
|
pthread_rwlock_unlock(&rwlock);
|
|
}
|
|
};
|
|
|
|
struct SetRootGuard
|
|
{
|
|
SetRootGuard() :
|
|
prevuid(currentuid),
|
|
prevgid(currentgid)
|
|
{
|
|
pthread_rwlock_unlock(&rwlock);
|
|
ugid_set(0,0);
|
|
}
|
|
|
|
~SetRootGuard()
|
|
{
|
|
pthread_rwlock_unlock(&rwlock);
|
|
ugid_set(prevuid,prevgid);
|
|
}
|
|
|
|
const uid_t prevuid;
|
|
const gid_t prevgid;
|
|
};
|
|
}
|
|
}
|