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(ITS#6776) Control handling in PassMod exop + ppolicy
Full_Name: Hallvard B Furuseth
Submission from: (NULL) (188.8.131.52)
Submitted by: hallvard
passwd_extop(op, rs) does an internal op->o_bd->be_modify(op, rs) and
then intentionally returns with sr_text, sr_ref, sr_ctrls from be_modify
intact, so the caller can send them. By my understanding this is quite
fragile, since these SlapReply values can be invalid/out of scope after
be_modify returns. It clashes with SlapReply cleanup effort, ITS#6758.
It does this so ppolicy can insert its controls there, after detecting
that the current be->be_modify call is actually a Password Modify exop.
Maybe passwd_extop() instead can give the Modify a response or cleanup
handler which steals any controls from the SlapReply, and reinserts them
after be_modify() returns?
OTOH - I don't know how slapd manages controls nowadays (what decides
which controls should be freed, etc) - but I notice ppolicy.c has its
very own ctrls_cleanup(). Hopefully that function is general enough
that it would be useful to move it into slapd - if it needs its own
special control handling, then maybe this issue expands to a need
for a general control handling module. ppolicy registers its control
as valid with Password Modify, which tells Password Modify it can
steal it, etc.
One final issue: passwd.c says
cb.sc_private = qpw; /* let Modify know this was pwdMod,
* if it cares... */
and ppolicy recognizes any Modify with
(sc->sc_response == slap_null_cb && sc->sc_private)
as the Password Modify operation. Seems no guarantee. I suggest to
instead set some specific passwd_<response/cleanup>_sc function which
ppolicy can recognize - maybe in addition to the current check, so a
2.4.24-compiled ppolicy can work with 2.4.23 slapd and vice versa.