Re: Question about ldap_init, ldap_initialize, start_tls, LDAP_OPT_X_TLS_ALLOW and TLS/SSL

[Howard Chu <hyc@symas.com>]

Markus Moeller wrote:
> Howard,
>
> I use OpenSuse 10.2 with  libldap-2.3.so.0.2.15 and if  I have an empty
> ~/.ldaprc file ldap_start_tls_s comes back with error -11 Connect error

LDAP_OPT_X_TLS is not the same as LDAP_OPT_X_TLS_REQUIRE_CERT.

By default, certificate checking is enforced, and you must supply a valid CA 
cert, just like it says in the manpages and the Admin Guide.

> ldap_int_select
> read1msg: ld 0x8054608 msgid 1 all 1
> read1msg: ld 0x8054608 msgid 1 message type extended-result
> read1msg: ld 0x8054608 0 new referrals
> read1msg:  mark request completed, ld 0x8054608 msgid 1
> request done: ld 0x8054608 msgid 1
> res_errno: 0, res_error: <>, res_matched: <>
> ldap_free_request (origid 1, msgid 1)
> ldap_free_connection 0 1
> ldap_free_connection: refcnt 1
> ldap_parse_extended_result
> ldap_parse_result
> ldap_msgfree
> TLS trace: SSL_connect:before/connect initialization
> TLS trace: SSL_connect:SSLv2/v3 write client hello A
> TLS trace: SSL_connect:SSLv3 read server hello A
> TLS certificate verification: depth: 0, err: 20, subject:
> /CN=w2k3.windows2003.home, issuer: /DC=home/DC=windows2003/CN=Windows2003CA
> TLS certificate verification: Error, unable to get local issuer certificate
> TLS trace: SSL3 alert write:fatal:unknown CA
> TLS trace: SSL_connect:error in SSLv3 read server certificate B
> TLS trace: SSL_connect:error in SSLv3 read server certificate B
> TLS: can't connect.
> ldap_err2string
> Error while setting start_tls for ldap server: Connect error(-11)
> ldap_free_connection 1 1
> ldap_send_unbind
>
> When I add  tls_reqcert allow to ~/.ldaprc I get
>
> ldap_int_select
> read1msg: ld 0x8054608 msgid 1 all 1
> read1msg: ld 0x8054608 msgid 1 message type extended-result
> read1msg: ld 0x8054608 0 new referrals
> read1msg:  mark request completed, ld 0x8054608 msgid 1
> request done: ld 0x8054608 msgid 1
> res_errno: 0, res_error: <>, res_matched: <>
> ldap_free_request (origid 1, msgid 1)
> ldap_free_connection 0 1
> ldap_free_connection: refcnt 1
> ldap_parse_extended_result
> ldap_parse_result
> ldap_msgfree
> TLS trace: SSL_connect:before/connect initialization
> TLS trace: SSL_connect:SSLv2/v3 write client hello A
> TLS trace: SSL_connect:SSLv3 read server hello A
> TLS certificate verification: depth: 0, err: 20, subject:
> /CN=w2k3.windows2003.home, issuer: /DC=home/DC=windows2003/CN=Windows2003CA
> TLS certificate verification: Error, unable to get local issuer certificate
> TLS certificate verification: depth: 0, err: 27, subject:
> /CN=w2k3.windows2003.home, issuer: /DC=home/DC=windows2003/CN=Windows2003CA
> TLS certificate verification: Error, certificate not trusted
> TLS certificate verification: depth: 0, err: 21, subject:
> /CN=w2k3.windows2003.home, issuer: /DC=home/DC=windows2003/CN=Windows2003CA
> TLS certificate verification: Error, unable to verify the first certificate
> TLS trace: SSL_connect:SSLv3 read server certificate A
> TLS trace: SSL_connect:SSLv3 read server certificate request A
> TLS trace: SSL_connect:SSLv3 read server done A
> TLS trace: SSL_connect:SSLv3 write client certificate A
> TLS trace: SSL_connect:SSLv3 write client key exchange A
> TLS trace: SSL_connect:SSLv3 write change cipher spec A
> TLS trace: SSL_connect:SSLv3 write finished A
> TLS trace: SSL_connect:SSLv3 flush data
> TLS trace: SSL_connect:SSLv3 read finished A
> TLS trace: SSL3 alert write:warning:bad certificate
> TLS: unable to get peer certificate.
> Successfully set up TLS protected connection to ldap server
> w2k3.windows2003.home:389
>
>
> So, this setting definitely does something !!

--
  -- Howard Chu
  Chief Architect, Symas Corp.  http://www.symas.com
  Director, Highland Sun        http://highlandsun.com/hyc/
  Chief Architect, OpenLDAP     http://www.openldap.org/project/