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ITS#2602 EXTERNAL authentication : certificate dn mismatch

I am unable to reproduce this error using the current OpenLDAP 2.1 code on

>From my slapd.conf:
sasl-regexp cn=(.*),ou=.*,.* ldap:///o=Symas%20Corp.,c=US??sub?(cn=$1)

access to *
        by group.base="cn=foo,o=symas corp.,c=us" write
        by * read

database        bdb
#ldbm#cachesize 0
suffix          "o=Symas Corp.,c=US"
directory       ./test-db
index           objectClass     eq
index           cn,sn,uid       pres,eq,sub

Here's my certificate DN. The DN is in ISO8859-1.

 Subject: C=US, ST=California, L=Los Angeles, O=Symas Corporation, OU=Secret
Research Labs, CN=\xC3lpha \xC3\xE6ro.

The slapd normalizer turns it into UTF-8:

TLS trace: SSL_accept:SSLv3 flush data
=> ldap_dn2bv(16)
<= ldap_dn2bv(cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret research labs,o=symas
corporation,l=los angeles,st=california,c=us,16)=0

Here's the cn=foo group:

dn: cn=foo,o=symas corp.,c=us
objectclass: groupOfNames
cn: foo
member:: Y249w4NscGhhIMODw6ZybyxvPVN5bWFzIENvcnAuLGM9VVM=

Note that the member is base64-encoded UTF-8. None of its contents are

do_sasl_bind: dn () mech EXTERNAL
==> sasl_bind: dn="" mech=EXTERNAL datalen=0
SASL Canonicalize [conn=0]: authcid="cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret
research labs,o=symas corporation,l=los angeles,st=california,c=us"
slap_sasl_getdn: id=cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret research
labs,o=symas corporation,l=los angeles,st=california,c=us [len=105]
==>slap_sasl2dn: converting SASL name cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret
research labs,o=symas corporation,l=los angeles,st=california,c=us to a DN
slap_sasl_regexp: converting SASL name cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret
research labs,o=symas corporation,l=los angeles,st=california,c=us
slap_sasl_regexp: converted SASL name to
ldap:///o=Symas%20Corp.,c=US??sub?(cn=\C3\A3lpha \C3\A3\C3\A6ro)
slap_parseURI: parsing ldap:///o=Symas%20Corp.,c=US??sub?(cn=\C3\A3lpha
put_filter: "(cn=\C3\A3lpha \C3\A3\C3\A6ro)"
put_filter: simple
put_simple_filter: "cn=\C3\A3lpha \C3\A3\C3\A6ro"

Note that the directroy entry has UTF-8, not hex-escaped:

bdb_search_candidates: id=1 first=2 last=2
====> bdb_cache_return_entry_r( 1 ): created (0)
entry_decode: "cn=Ãlpha Ãæro,o=Symas Corp.,c=US"
<= entry_decode(cn=Ãlpha Ãæro,o=Symas Corp.,c=US)
====> bdb_cache_return_entry_r( 2 ): created (0)
<==slap_sasl2dn: Converted SASL name to cn=ãlpha ãæro,o=symas corp.,c=us
getdn: dn:id converted to cn=ãlpha ãæro,o=symas corp.,c=us
SASL Canonicalize [conn=0]: authcDN="cn=ãlpha ãæro,o=symas corp.,c=us"
SASL Authorize [conn=0]: authcid="cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret
research labs,o=symas corporation,l=los angeles,st=california,c=us"
authzid="cn=\C3\A3lpha \C3\A3\C3\A6ro,ou=secret research labs,o=symas
corporation,l=los angeles,st=california,c=us"
SASL Authorize [conn=0]:  authorization allowed

Here's the group ACL evaluation, which succeeds:

=> bdb_group: group ndn: "cn=foo,o=symas corp.,c=us"
=> bdb_group: op ndn: "cn=ãlpha ãæro,o=symas corp.,c=us"
=> bdb_group: oc: "groupOfNames" at: "member"
=> bdb_group: tr ndn: "o=symas corp.,c=us"
bdb_dn2entry_rw("cn=foo,o=symas corp.,c=us")
=> bdb_dn2id( "cn=foo,o=symas corp.,c=us" )
<= bdb_dn2id: got id=0x00000003
entry_decode: "cn=foo,o=symas corp.,c=us"
<= entry_decode(cn=foo,o=symas corp.,c=us)
>>> dnNormalize: <cn=Ãlpha Ãæro,o=Symas Corp.,c=US>
=> ldap_bv2dn(cn=Ãlpha Ãæro,o=Symas Corp.,c=US,0)
<= ldap_bv2dn(cn=Ãlpha Ãæro,o=Symas Corp.,c=US,0)=0
=> ldap_dn2bv(272)
<= ldap_dn2bv(cn=ãlpha ãæro,o=symas corp.,c=us,272)=0
<<< dnNormalize: <cn=ãlpha ãæro,o=symas corp.,c=us>
dnMatch 0
        "cn=ãlpha ãæro,o=symas corp.,c=us"
        "cn=ãlpha ãæro,o=symas corp.,c=us"
====> bdb_cache_return_entry_r( 3 ): created (0)
bdb_group: rc=0

The hex-escaping is for display convenience and to escape reserved characters
(such as comma and semicolon). It does not affect internal comparisons.

Without further information illustrating the problem, this report will be

  -- Howard Chu
  Chief Architect, Symas Corp.       Director, Highland Sun
  http://www.symas.com               http://highlandsun.com/hyc
  Symas: Premier OpenSource Development and Support