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Add mutexes around nss operations and serialize them.
This is necessary because nss operations may have global state.
For pam it is sufficient to protect socket operations instead.
As pam functions use only the provided pam handler.
Fixes: https://fedorahosted.org/sssd/ticket/640
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This is useful for guaranteeing the size of an input buffer.
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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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Display warnings about remaining grace logins and password
expiration to the user, when LDAP Password Policies are used.
Improved detection if LDAP Password policies are supported by
LDAP Server.
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I fixed a handful of alignment problems in sss_client and nss responder.
Enumerating group and passwd with getgrent and getpwent now works correctly
on ARM.
Signed-off-by: George McCollister <georgem@novatech-llc.com>
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So far we handled expired password during authentication. Other PAM
modules typically detect expired password during account management and
return PAM_NEW_AUTHTOK_REQD if the password is expired and should be
changed. The PAM library then calls the change password routines. To
meet these standards pam_sss is change accordingly.
As a result it is now possible to update an expired password via ssh if
sssd is running with PasswordAuthentication=yes. One drawback due to
limitations of PAM is that the user now has to type his current password
again before setting a new one.
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Also update BUILD.txt
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