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added comments about trapdoor uids

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Andrew Tridgell 0001-01-01 00:00:00 +00:00
parent 875b2dfad0
commit 2f793c48a9
2 changed files with 35 additions and 0 deletions
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32
docs/samba.faq
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@ -402,6 +402,38 @@ valid.
See also 'guest account' in smb.conf man page. See also 'guest account' in smb.conf man page.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* 11: You get the message "you appear to have a trapdoor uid system"
in your logs
This can have several causes. It might be because you are using a uid
or gid of 65535 or -1. This is a VERY bad idea, and is a big security
hole. Check carefully in your /etc/passwd file and make sure that no
user has uid 65535 or -1. Especially check the "nobody" user, as many
broken systems are shipped with nobody setup with a uid of 65535.
It might also mean that your OS has a trapdoor uid/gid system :-)
This means that once a process changes effective uid from root to
another user it can't go back to root. Unfortunately Samba relies on
being able to change effective uid from root to non-root and back
again to implement its security policy. If your OS has a trapdoor uid
system this won't work, and several things in Samba may break. Less
things will break if you use user or server level security instead of
the default share level security, but you may still strike
problems.
The problems don't give rise to any security holes, so don't panic,
but it does mean some of Samba's capabilities will be unavailable.
In particular you will not be able to connect to the Samba server as
two different uids at once. This may happen if you try to print as a
"guest" while accessing a share as a normal user. It may also affect
your ability to list the available shares as this is normally done as
the guest user.
Complain to your OS vendor and ask them to fix their system.
=============================================================================== ===============================================================================
SECTION FOUR: Specific client problems SECTION FOUR: Specific client problems
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

3
docs/textdocs/UNIX-SMB.txt
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@ -155,6 +155,9 @@ within the one process. On some unixes (such as SCO) this is not
possible. This means that on those unixes the client is restricted to possible. This means that on those unixes the client is restricted to
a single uid. a single uid.
Note that you can also get the "trapdoor uid" message for other
reasons. Please see the FAQ for details.
Port numbers Port numbers
============ ============