Atualizamos recentemente os certificados de CA em nosso host LDAP. Há alguns servidores CentOS 5.x que parecem não ter nenhum problema na autenticação do host LDAP, mas há um servidor Centos 6.6 que não é capaz. Não sei como o servidor foi originalmente configurado, e o administrador do sistema não deixou muito em termos de documentação quando saiu. O cliente ldapsearch parece funcionar sem problemas. Quando executo ldapsearch com saída de depuração maximamente detalhada, não vejo nenhum erro:
$ ldapsearch -h ldap.hostname.com -x -LLL -v -d 167 -s base -b "" 2>&1 | grep -i error
res_errno: 0, res_error: <>, res_matched: <>
res_errno: 0, res_error: <>, res_matched: <>
Aqui está a saída do utilitário openssl s_client :
$ openssl s_client -connect ldap.hostname.com:636 < /dev/null
CONNECTED(00000003)
depth=3 C = SE, O = AddTrust AB, OU = AddTrust External TTP Network, CN = AddTrust External CA Root
verify return:1
depth=2 C = US, ST = New Jersey, L = Jersey City, O = The USERTRUST Network, CN = USERTrust RSA Certification Authority
verify return:1
depth=1 C = US, ST = MI, L = Ann Arbor, O = Internet2, OU = InCommon, CN = InCommon RSA Server CA
verify return:1
depth=0 C = , postalCode = , ST = , L = , street = , O = , OU = , CN = ldap.hostname.com
verify return:1
---
Certificate chain
0 s:/C=US/postalCode=/ST=/L=/street=/OU=/CN=ldap.hostname.com
i:/C=US/ST=MI/L=Ann Arbor/O=Internet2/OU=InCommon/CN=InCommon RSA Server CA
1 s:/C=US/ST=MI/L=Ann Arbor/O=Internet2/OU=InCommon/CN=InCommon RSA Server CA
i:/C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
2 s:/C=US/ST=New Jersey/L=Jersey City/O=The USERTRUST Network/CN=USERTrust RSA Certification Authority
i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
3 s:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
i:/C=SE/O=AddTrust AB/OU=AddTrust External TTP Network/CN=AddTrust External CA Root
---
Server certificate
-----BEGIN CERTIFICATE-----
[...]
-----END CERTIFICATE-----
subject=/C=/postalCode=/ST=/L=/street=/O=/OU=/CN=ldap.hostname.com
issuer=/C=US/ST=MI/L=Ann Arbor/O=Internet2/OU=InCommon/CN=InCommon RSA Server CA
---
No client certificate CA names sent
---
SSL handshake has read 5715 bytes and written 607 bytes
---
New, TLSv1/SSLv3, Cipher is AES256-SHA256
Server public key is 2048 bit
Secure Renegotiation IS supported
Compression: NONE
Expansion: NONE
SSL-Session:
Protocol : TLSv1.2
Cipher : AES256-SHA256
Session-ID: [...]
Session-ID-ctx:
Master-Key: [...]
Key-Arg : None
Krb5 Principal: None
PSK identity: None
PSK identity hint: None
Start Time: [...]
Timeout : 300 (sec)
Verify return code: 0 (ok)
---
DONE
Quando executo o nslcd no modo de depuração, encontro os seguintes erros:
$ sudo nslcd -d -d -d 2>&1 > nslcd.log
$ cat nslcd.log | grep -i error
res_errno: 0, res_error: <>, res_matched: <>
TLS: cannot open certdb '/etc/openldap/cacerts', error -8018:Unknown PKCS #11 error.
TLS: certificate [...] is not valid - error -8172:Peer's certificate issuer has been marked as not trusted by the user..
TLS: error: connect - force handshake failure: errno 0 - moznss error -8172
TLS: can't connect: TLS error -8172:Peer's certificate issuer has been marked as not trusted by the user..
nslcd: [8b4567] ldap_start_tls_s() failed: Connect error (uri="ldap://ldap.hostname.com/")
nslcd: [8b4567] failed to bind to LDAP server ldap://ldap.hostname.com/: Connect error
res_errno: 0, res_error: <>, res_matched: <>
[...]
Aqui estão os conteúdos de /etc/ldap.conf :
base o=org
timelimit 120
bind_timelimit 120
idle_timelimit 3600
nss_initgroups_ignoreusers root,ldap,named,avahi,haldaemon,dbus,radvd,tomcat,radiusd,news,mailman,nscd,gdm
nss_map_attribute uniqueMember member
nss_base_passwd ou=People,?one
nss_base_group ou=Group,?one
tls_cert
tls_key
uri ldap://ldap.hostname.com
ssl start_tls
TLS_CACERTDIR /etc/openldap/certs
pam_password md5
SUDOERS_BASE ou=SUDOers,o=org
Aqui estão os conteúdos de /etc/openldap/ldap.conf :
TLS_CACERTDIR /etc/openldap/certs
URI ldap://ldap.hostname.com/
BASE o=org
E aqui está o conteúdo de /etc/nslcd.conf :
uid nslcd
gid ldap
uri ldap://ldap.hostname.com/
base o=org
ssl start_tls
tls_cacertdir /etc/openldap/cacerts
tls_cacertfile /etc/openldap/cacerts/authconfig_downloaded.pem
Eu pesquisei as mensagens de erro no Google, mas estou mais do que um pouco sobrecarregado com toda a documentação do LDAP que encontrei on-line. Qualquer conselho seria muito apreciado.