給ldap配置ssl

ldapssl有兩種實現方法
1、自簽名證書，這種方法需要在ldap客戶端上的/etc/nslcd.conf中新增tls_reqcert_allow來允許不驗證證書
2、ca簽名證書，你應該將證書放在/etc/openldap/cacerts/目錄下來保證ldap客戶端可以驗證證書

生成金鑰

[[email protected]] /etc/pki/tls/certs$ openssl genrsa -aes128 2048 > server.key
Generating RSA private key, 2048 bit long modulus
.+++
..........+++
e is 65537 (0x10001)
Enter pass phrase:
Verifying - Enter pass phrase:
 

移除金鑰的密碼

[[email protected]] /etc/pki/tls/certs$ openssl rsa -in server.key -out server.key
Enter pass phrase for server.key:
writing RSA key

生成csr

[[email protected]] /etc/pki/tls/certs$ openssl req -utf8 -new -key server.key -out server.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:CN
State or Province Name (full name) []:Shanghai
Locality Name (eg, city) [Default City]:Shanghai
Organization Name (eg, company) [Default Company Ltd]:baidu
Organizational Unit Name (eg, section) []:sre    
Common Name (eg, your name or your server's hostname) []:slave3.hanli.com
Email Address []:
 
[email protected]

Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []:520224
An optional company name []:baidu

生成crt

[[email protected]] /etc/pki/tls/certs$ openssl x509 -in server.csr -out server.crt -req -signkey server.key -days 3650
Signature ok
subject=/C=CN/ST=Shanghai/L=Shanghai/O=baidu/OU=sre/CN=slave3.hanli.com/
 
[email protected]
Getting Private key

複製到ldap的證書目錄下

[[email protected]] /etc/pki/tls/certs$ cp /etc/pki/tls/certs/server.key \
> /etc/pki/tls/certs/server.crt \
> /etc/pki/tls/certs/ca-bundle.crt \
> /etc/openldap/certs/ 

修改許可權

[[email protected]] /etc/openldap/certs$ chown ldap. /etc/openldap/certs/server.key \
> /etc/openldap/certs/server.crt \
> /etc/openldap/certs/ca-bundle.crt

建立ssl配置

[[email protected] ~]# vi mod_ssl.ldif
# create new
 dn: cn=config
changetype: modify
add: olcTLSCACertificateFile
olcTLSCACertificateFile: /etc/openldap/certs/ca-bundle.crt
-
replace: olcTLSCertificateFile
olcTLSCertificateFile: /etc/openldap/certs/server.crt
-
replace: olcTLSCertificateKeyFile
olcTLSCertificateKeyFile: /etc/openldap/certs/server.key

匯入

[[email protected]] ~$ ldapmodify -Y EXTERNAL -H ldapi:/// -f mod_ssl.ldif
SASL/EXTERNAL authentication started
SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
SASL SSF: 0
modifying entry "cn=config"

驗證配置檔案是否正確

slaptest -u

修改伺服器配置

[[email protected]] ~$ vi /etc/sysconfig/slapd

# line 9: add
SLAPD_URLS="ldapi:/// ldap:/// ldaps:///"

重啟

[[email protected]] ~$ systemctl restart slapd

檢查埠，發現埠已改變

[[email protected]] ~$ netstat -antlp |grep 636
tcp        0      0 0.0.0.0:636             0.0.0.0:*               LISTEN      15877/slapd         
tcp6       0      0 :::636                  :::*                    LISTEN      15877/slapd         

修改客戶端配置

[[email protected]] ~$ echo "TLS_REQCERT allow" >> /etc/openldap/ldap.conf 
[[email protected]] ~$  echo "tls_reqcert allow" >> /etc/nslcd.conf 
[[email protected]] ~$ authconfig --enableldaptls --update 

https://www.server-world.info/en/note?os=CentOS_7&p=openldap&f=4
https://www.itzgeek.com/how-tos/linux/centos-how-tos/configure-openldap-with-ssl-on-centos-7-rhel-7.html