latest passdb checkins
gcarter at valinux.com
Tue Nov 21 20:47:22 GMT 2000
Simo Sorce wrote:
> > Also, I have reworked the TDB passdb backend. In doing so,
> > I realized that this DBM is to limited for a passdb.
> > Thus the "T" meaning "Trivial". We need a more robust DBM
> > with transactional support and multiple indexes for searching.
> > Right now, the Berkely DB looks like a good replacement.
> > The Gnu DBM may be another possibility, but I have not explored
> > it as much.
> Hi, when I created it I hit the problem the tdb has
> only one index. We may change to GnuDBM or BerkeleyDBM
> (just reading the implementation, but which platforms we
> will cut using this DBs ?), but I think a way to use TDB
> and act as it is a multi indexed database may be achieved!
The problem is the operations must be atomic. Searches
are fine. It's updates that become the problem. You will
have to implement 3 updates for one record. Suppose your
machine goes down in between updating the actual SAM_ACCOUNT
and the seach table ro rid lookups. The next time you
lookup by a rid, the search may indicate the the entry
does not exist when in fact it does.
> we really need to find data only in 3 ways:
> 1. search for username
> 2. search for rid
> 3. search for uid
> for user simo, uid 500, rid 012345678 we have:
> USER_simo -> SAM_ACCOUNT
> UID_500 -> USER_simo
> RID_012345678 -> USER_simo
I thought about this, but the lack of atomic updates is
the big issue.
> what we need to take care is key consistency but, that
> not a big problem. If you think it is worth I would take
> the work to implement this idea!
I don't really. By providing pluggable backends, we
are not creating an unnecessary dependence. Simply a richer
alternative to smbpasswd. Someone could write another in
mySQL is they wanted.
Again, initially I want
o Full local SAM style DB
o AD style schema in LDAP
/\ Gerald (Jerry) Carter Professional Services
\/ http://www.valinux.com/ VA Linux Systems gcarter at valinux.com
http://www.samba.org/ SAMBA Team jerry at samba.org
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