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rewriting compare ava with overlay rwm

Hi,

we're using openldap 2.3.35 as ldap proxy to support anonymous binds and searches to a restricted ldap server.

We're now trying to rewrite existing cn's with old suffix to new cn's with new suffix of the restricted ldap server.
So far almost everything is working with rwm-suffixmassage and overlay rwm except rewriting AVA's from ldapcompare.

I'm still not sure if this is actually possible with overlay rwm or if i'm misunderstanding the manpage of slapo-rwm.
Rewriting the cn's in searches, searchresults, bindDN and compareDN works, but the AVA from the compared
attribute (here: cn) is not changed from rewriteContext compareAttrDN.
"man slapo-rwm" says that the rewriteContext compareAttrDN rewrites compare AVA, but whatever i try it's not
changing anything in the ldapcompare.

What format of the rwm-rewriteRules for rewriteContext compareAttrDN is expected for rewriting to succeed?
Or is this actually impossible what i'm thinking of?


Here my shortened (removed a lot of rewriteRules, but still working) slapd.conf:

# slapd.conf
loglevel -1
include         /usr/local/etc/openldap/schema/core.schema
pidfile         /usr/local/var/run/slapd.pid
argsfile        /usr/local/var/run/slapd.args
modulepath      /usr/local/libexec/openldap
moduleload      rwm.la

overlay rwm
rwm-suffixmassage "o=sskm" "ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern"

database  ldap
suffix "ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern"
uri "ldap://5.1.35.254/"
network-timeout 3
chase-referrals no
idassert-bind bindmethod=simple binddn="cn=q001ldap,ou=dienstkonten,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern" credentials="secret" mode=none
idassert-authzFrom "dn.regex:.*"

overlay rwm
rwm-rewriteEngine on
rwm-rewriteContext searchFilter
rwm-rewriteRule "cn=99([0-9]{3})" "cn=s001x$1" ":@"
rwm-rewriteContext bindDN
rwm-rewriteRule "cn=99([0-9]{3}),(.+)" "cn=s001x$1,$2" ":@"
rwm-rewriteContext searchEntryDN
rwm-rewriteRule "cn=s001x([0-9]{3}),(.+)" "cn=99$1,$2" ":@"
rwm-rewriteContext compareDN
rwm-rewriteRule "cn=99([0-9]{3}),(.+)" "cn=s001x$1,$2" ":@"
rwm-rewriteContext compareAttrDN
rwm-rewriteRule "99([0-9]{3})" "s001x$1"
# end slapd.conf



The basic idea from this simple setup is to rewrite a cn=99854 to cn=s001x854 and back whereever possible.
I'm trying with
    ldapcompare -x -D "" -H ldap://testproxy cn=99854,o=sskm cn:99854
this fails and produces the following logs

slapd[9789]: do_compare
slapd[9789]: >>> dnPrettyNormal: <cn=99854,o=sskm>
slapd[9789]: <<< dnPrettyNormal: <cn=99854,o=sskm>, <cn=99854,o=sskm>
slapd[9789]: [rw] compareDN: "cn=99854,o=sskm" -> "cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern"
slapd[9789]: >>> dnPrettyNormal: <cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: <<< dnPrettyNormal: <cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>, <cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: do_compare: dn (cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern) attr (cn) value (99854)
slapd[9789]: conn=1 op=1 CMP dn="cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern" attr="cn"
slapd[9789]: [rw] compareDN: "cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern" -> "cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern"
slapd[9789]: >>> dnPrettyNormal: <cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: <<< dnPrettyNormal: <cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>, <cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: send_ldap_result: conn=1 op=1 p=3
slapd[9789]: send_ldap_result: err=5 matched="" text=""


packet capturing shows that the value is not rewritten when sent to the ldap server.
Using the value which i was trying to rewrite to
    ldapcompare -x -D "" -H ldap://testproxy cn=99854,o=sskm cn:s001x854
succeeds

slapd[9789]: do_compare
slapd[9789]: >>> dnPrettyNormal: <cn=99854,o=sskm>
slapd[9789]: <<< dnPrettyNormal: <cn=99854,o=sskm>, <cn=99854,o=sskm>
slapd[9789]: [rw] compareDN: "cn=99854,o=sskm" -> "cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern"
slapd[9789]: >>> dnPrettyNormal: <cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: <<< dnPrettyNormal: <cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>, <cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: do_compare: dn (cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern) attr (cn) value (s001x854)
slapd[9789]: conn=10 op=1 CMP dn="cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern" attr="cn"
slapd[9789]: [rw] compareDN: "cn=99854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern" -> "cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern"
slapd[9789]: >>> dnPrettyNormal: <cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: <<< dnPrettyNormal: <cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>, <cn=s001x854,ou=benutzer,ou=konten,ou=institut,dc=e001dpk1,dc=e001,dc=intern>
slapd[9789]: send_ldap_result: conn=10 op=1 p=3
slapd[9789]: send_ldap_result: err=6 matched="" text=""




-- 

Jens Grigel

Citysavingsbank Munich, Germany
Dept. of Network/Security