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, PHP 8)
posix_seteuid — Set the effective UID of the current process
Description
Set the effective 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.
Parameters
-
user_id -
The user id.
Return Values
Returns true on success or false on failure.
See Also
- posix_geteuid() - Return the effective user ID of the current process
- posix_setuid() - Set the UID of the current process
- posix_getuid() - Return the real user ID of the current process
add a note
User Contributed Notes 1 note
divinity76 at gmail dot com ¶
4 years ago
