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Server-interpreted Authentication Types "localuser" and "localgroup":
On systems which can determine in a secure fashion the credentials of a client
process, the "localuser" and "localgroup" authentication methods provide access
based on those credentials. The format of the values provided is platform
specific. For POSIX & UNIX platforms, if the value starts with the character
'#', the rest of the string shall be treated as a decimal uid or gid, otherwise
the string is defined as a user name or group name.
Systems offering this MUST not simply trust a user supplied value (such as an
environment variable or IDENT protocol response). It is expected many systems
will only support this for clients running on the same host using a local IPC
transport.
Examples:
xhost +SI:localuser:alanc
xhost +SI:localuser:#1234
xhost +SI:localgroup:wheel
xhost +SI:localgroup:#0
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