Daniel J Walsh wrote:
Paul Howarth wrote:
Paul Howarth wrote:
The PAM config files for vsftpd and prpftpd look like this:
#%PAM-1.0
session optional pam_keyinit.so force revoke
auth required pam_listfile.so item=user sense=deny
file=/etc/vsftpd/ftpusers onerr=succeed
auth required pam_shells.so
auth include system-auth
account include system-auth
session include system-auth
session required pam_loginuid.so
So it makes sense for ftpd_t to be able to set the login uid and
create a session keyring:
logging_set_loginuid(ftpd_t)
allow ftpd_t self:key { write search link };
Curiously, I've done this locally but still get this AVC when logging
in on proftpd, with an open dovecot IMAP session on the same server:
type=AVC msg=audit(1182853960.377:103383): avc: denied { link } for
pid=24601 comm="proftpd" scontext=root:system_r:ftpd_t:s0
tcontext=root:system_r:dovecot_t:s0 tclass=key
FWIW, I'm also getting in /var/log/secure:
Jun 26 12:09:42 goalkeeper proftpd: PAM audit_log_user_message()
failed: Operation not permitted
Jun 26 12:09:42 goalkeeper proftpd[25559]:
goalkeeper.intra.city-fan.org
(::ffff:192.168.2.20[::ffff:192.168.2.20]) - PAM(setcred): System error
Jun 26 12:09:42 goalkeeper proftpd: pam_unix(proftpd:session): session
closed for user paul
Jun 26 12:09:42 goalkeeper proftpd[25559]:
goalkeeper.intra.city-fan.org
(::ffff:192.168.2.20[::ffff:192.168.2.20]) - PAM(close_session):
System error
Jun 26 12:09:42 goalkeeper proftpd[25559]:
goalkeeper.intra.city-fan.org
(::ffff:192.168.2.20[::ffff:192.168.2.20]) - FTP session closed.
I don't see any AVCs to go with these, and adding:
logging_send_audit_msg(ftpd_t)
doesn't seem to help.
Paul.
This could be caused by proftp not running as root and not having the
auth_write capability. So a DAC error could be causing this problem.
Proftpd runs as nobody out of the box; what would I need to change to
fix this? Which object's DAC permissions are the problem?
type=AVC msg=audit(1182853960.377:103383): avc: denied { link } for
pid=24601 comm="proftpd" scontext=root:system_r:ftpd_t:s0
tcontext=root:system_r:dovecot_t:s0 tclass=key
I have no idea what this even means. :^) One of these days I need to
investigate the kernel keyring.
It doesn't seem to cause any problem, but I would like to know what it
is if you ever figure it out.
Cheers, Paul.
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