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If there is abstract socket support:
====================================
use them as "\0/tmp/fam-$USER-$GAM_CLIENT_ID"
They are not mapped on the filesystem, no attack is possible that way.
The client and the server checks on the first '\0' byte received that
the other side is of the same UID
If there is no abstract socket support:
=======================================
Server side:
------------
start:
try to create /tmp/fam-$USER using mkdir('/tmp/fam-$USER', 007)
if error:
make a stat() on it
if doesn't exist:
return failure to create
if user is not getuid() or mode is not 007 or type is not dir:
try to unlink()
if error:
exit with error.
if success:
goto start:
do the socket()/bind() on /tmp/fam-$USER/fam-$GAM_CLIENT_ID
Client side:
------------
make a stat on /tmp/fam-$USER
if doesn't exist:
return failure to create should start the server
if user is not getuid() or mode is not 007 or type is not dir:
try to unlink()
if error:
exit with error.
if success:
return failure should start the server
make a stat on /tmp/fam-$USER/fam-$GAM_CLIENT_ID
if doesn't exist:
return failure to create should start the server
if user is not getuid() or type is not socket:
try to unlink()
if error:
exit with error.
if success:
return failure should start the server
do the socket()/connect() on /tmp/fam-$USER/fam-$GAM_CLIENT_ID
The client and the server checks on the first '\0' byte received that
the other side is of the same UID.