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Also adds an option to limit how often we check the ID provider,
so that conversations with multiple PAM requests won't update the
cache multiple times.
https://fedorahosted.org/sssd/ticket/749
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Currently we do not handle the open nss request after a reconnect and
wait until they timeout (which is a couple of minutes!). This patch adds
a handler that terminates all requests after a reconnect. Then responder
will return matching cache entries or nothing.
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Previously, if a second enumeration request arrived while one was
already being processed, each process would receive only a subset
of the total number of available users or groups. This is because
we were maintaining the response object as a global value in the
NSS responder. The second request would come in, see that the data
set was already populated, and start reading from wherever the
cursor was currently pointed.
With this patch, we now move the cursor to the client context
instead of the global NSS context.
Additionally, this patch completely rewrites the approach to
enumerations in the tevent_req style. This makes it much easier to
follow in the code.
In order to ensure that a slow or malicious client cannot hold
onto a reference for the setent result object indefinitely, we
set an expiration on the object. We use the enum_cache_timeout
here, since that is an appropriate value.
If the timeout fires during the normal operation of the get*ent()
loop of a client program, we will save the current values of the
read index so that we can resume as soon as the object has been
refreshed by an implicit setent call.
Instead of deleting the enumeration result object immediately
after the last in-progress client has read it, we'll keep the
object around for the lifetime of enum_cache_timeout. This way,
additional clients making enumeration requests can still access
the results in-memory.
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This is the second attempt to let the PAM client and the PAM responder
exchange their credentials, i.e. uid, gid and pid. Because this approach
does not require any message interchange between the client and the
server the protocol version number is not changed.
On the client side the connection is terminated it the responder is not
run by root. On the server side the effective uid and gid and the pid of
the client are available for future use.
The following additional changes are made by this patch:
- the checks of the ownership and the permissions on the PAM sockets are
enhanced
- internal error codes are introduced on the client side to generate
more specific log messages if an error occurs
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This reverts commit 5a88e963744e5da453e88b5c36499f04712df097.
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- check if the public socket belongs to root and has 0666 permissions
- use a SCM_CREDENTIALS message if available
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Also update BUILD.txt
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