if you want to set uid by username rather than uid, try combining it with posix_getpwnam(),
<?php
posix_seteuid (posix_getpwnam("www-data")["uid"]);
posix_setegid(posix_getpwnam("www-data")["gid"]);
?>
note that posix_getpwnam() reads /etc/passwd on each invocation, if you need it to go fast, this should be faster (only read passwd once):
<?php
$posix_user_info=posix_getpwnam("www-data");
posix_seteuid ($posix_user_info["uid"]);
posix_setegid($posix_user_info["gid"]);
?>
and to go back to being root, just set them to 0,
<?php
posix_seteuid(0);
posix_setegid(0);
?>
posix_seteuid
(PHP 4 >= 4.0.2, PHP 5, PHP 7)
posix_seteuid — Set the effective UID of the current process
설명
bool posix_seteuid
( int
$uid
)Set the real user ID of the current process. This is a privileged function and needs appropriate privileges (usually root) on the system to be able to perform this function.
인수
-
uid -
The user id.
반환값
성공 시 TRUE를, 실패 시 FALSE를 반환합니다.
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User Contributed Notes 1 note
divinity76 at gmail dot com ¶
4 years ago
