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89 lines
2.1 KiB
89 lines
2.1 KiB
/*
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Copyright (c) 2016, Antonio SJ Musumeci <trapexit@spawn.link>
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <grp.h>
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#include <pwd.h>
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#include <map>
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#include <vector>
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namespace mergerfs
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{
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namespace ugid
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{
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extern __thread uid_t currentuid;
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extern __thread gid_t currentgid;
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extern __thread bool initialized;
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struct Set
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{
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Set(const uid_t newuid,
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const gid_t newgid)
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{
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if(!initialized)
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{
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currentuid = ::syscall(SYS_geteuid);
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currentgid = ::syscall(SYS_getegid);
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initialized = true;
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}
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if(newuid == currentuid && newgid == currentgid)
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return;
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if(currentuid != 0)
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{
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::syscall(SYS_setreuid,-1,0);
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::syscall(SYS_setregid,-1,0);
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}
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if(newgid)
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{
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::syscall(SYS_setregid,-1,newgid);
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initgroups(newuid,newgid);
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}
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if(newuid)
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::syscall(SYS_setreuid,-1,newuid);
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currentuid = newuid;
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currentgid = newgid;
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}
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};
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struct SetRootGuard
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{
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SetRootGuard() :
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prevuid(currentuid),
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prevgid(currentgid)
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{
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Set(0,0);
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}
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~SetRootGuard()
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{
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Set(prevuid,prevgid);
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}
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const uid_t prevuid;
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const gid_t prevgid;
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};
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}
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}
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