Paul Howarth wrote:
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?
proftpd would need to start as root and then setuid to "nobody" When it
does setuid it would need to keep AUDIT_WRITE capability.
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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