Changes for page KerberosAndLDAP

Summary

• Page properties (1 modified, 0 added, 0 removed)

Details

Page properties

Content

...	...	@@ -22,84 +22,94 @@
22	22	##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
23	23
24	24
25		-=== Load ##kerberos LDAP## schema ===
	25	+=== Load kerberos LDAP schema ===
26	26
27		-Now you need to load the kerberos schema into the LDAP server on the Synology. And here you need to use the ##cn=config## DN.
	27	+Now you need to load the kerberos schema into the LDAP server on the Synology. Use the ##cn=config## DN.
28	28
29	29	(% style="color:#400" %)
30		-##{{{$ zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -H ldaps://nas.example.com/ -D cn=config -W}}}##
31		-##{{{Enter LDAP Password:}}}##
32		-##{{{adding new entry "cn=kerberos,cn=schema,cn=config"}}}##
33		-##{{{$}}}##
	30	+##{{{
	31	+$ zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -H ldaps://nas.example.com/ -D cn=config -W
	32	+Enter LDAP Password:
	33	+adding new entry "cn=kerberos,cn=schema,cn=config"
	34	+$
	35	+}}}##
34	34
35	35
36	36	=== Create Index on krbPrincipalName ===
37	37
38		-Having an index on the ##krbPrincipalName## improves performance and also suppresses some log messages if ##slapd## is configured to log more than default for the database(s) where you intend to store Kerberos data. As this is OpenLDAP on the Synology, it does not use ##mdb## format, it uses ##bdb##. If you install ##slapd## on Debian, it uses ##mdb## format. It is different database format, but the principle is the same. Again, as you are modifying config, the DN is ##cn=config##. Interestingly, it is still the main password you set for the Synology LDAP server.
	40	+Having an index on the ##krbPrincipalName## improves performance. Synology OpenLDAP does not use ##mdb## format, it uses ##bdb##. Debian ##slapd## uses ##mdb## format. It is different database format, but the principle is the same. Again, as you are modifying config, the DN is ##cn=config##. Use the main password you set for the Synology LDAP server. Create a file ##step1.ldif## with the following content:
39	39
40	40	(% style="color:#400" %)
41		-##{{{$ ldapmodify -H ldaps://nas.example.com/ -D cn=config -W <<EOF}}}##
42		-##{{{dn: olcDatabase={1}bdb,cn=config}}}##
43		-##{{{add: olcDbIndex}}}##
44		-##{{{olcDbIndex: krbPrincipalName eq,pres,sub}}}##
45		-##{{{EOF}}}##
46		-##{{{Enter LDAP Password:}}}##
47		-##{{{modifying entry "olcDatabase={1}bdb,cn=config"}}}##
48		-##{{{$}}}##
	43	+##{{{
	44	+dn: olcDatabase={1}bdb,cn=config
	45	+add: olcDbIndex
	46	+olcDbIndex: krbPrincipalName eq,pres,sub
	47	+}}}##
49	49
	49	+and apply it with
50	50
	51	+(% style="color:#400" %)
	52	+##{{{
	53	+$ ldapmodify -H ldaps://nas.example.com/ -D cn=config -W -f step1.ldif
	54	+Enter LDAP Password:
	55	+modifying entry "olcDatabase={1}bdb,cn=config"
	56	+$
	57	+}}}##
	58	+
	59	+
51	51	=== Create principals kadmin and kdc ===
52	52
53		-Next, you create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. As you will not run the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##. I diverge from the official Debian guide here as I do not agree with the DN they use. I also had to make changes to the DNs of ##kdc## and ##kadmin## due to ##pwdPolicy## applied by Synology to their LDAP server. The official guide will have you use placeholder passwords and that does not work with the Synology LDAP server. You need to generate them upfront with ##slappasswd -h {SSHA}##.
	62	+Next, you create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. Not running the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. Keeping things confined, everything will be created under a separate ##organizationalUnit##. My guide differs from the official Debian guide here. Due to Synology OpenLDAP having a strict password policy, it was necessary to adjust the DNs of ##kdc## and ##kadmin##. The official guide use placeholder passwords which does not work with the Synology LDAP server.
	63	+Generate the passwords upfront with ##slappasswd -h {SSHA}##. Then create a file ##step2.ldif## with the following content:
54	54
55	55	(% style="color:#400" %)
56		-##{{{$ ldapadd -H ldap://nas.example.com/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
57		-##{{{dn: ou=kerberos,dc=example,dc=com}}}##
58		-##{{{objectClass: organizationalUnit}}}##
59		-##{{{objectClass: top}}}##
60		-##{{{ou: kerberos}}}##
	66	+##{{{
	67	+dn: ou=kerberos,dc=example,dc=com
	68	+objectClass: organizationalUnit
	69	+objectClass: top
	70	+ou: kerberos
61	61
62		-(% style="color:#400" %)
63		-##{{{dn: cn=kdc,ou=kerberos,dc=example,dc=com}}}##
64		-##{{{cn: kdc}}}##
65		-##{{{sn: kdc}}}##
66		-##{{{objectClass: person}}}##
67		-##{{{objectClass: pwdPolicy}}}##
68		-##{{{pwdAttribute: userPassword}}}##
69		-##{{{pwdMinLength: 8}}}##
70		-##{{{pwdCheckQuality: 2}}}##
71		-##{{{pwdPolicySubentry: cn=kdc,ou=kerberos,dc=example,dc=com}}}##
72		-##{{{userPassword: {SSHA}<password-hash>}}}##
73		-##{{{description: Kerberos KDC Account}}}##
	72	+dn: cn=kdc,ou=kerberos,dc=example,dc=com
	73	+cn: kdc
	74	+sn: kdc
	75	+objectClass: person
	76	+objectClass: pwdPolicy
	77	+pwdAttribute: userPassword
	78	+pwdMinLength: 8
	79	+pwdCheckQuality: 2
	80	+pwdPolicySubentry: cn=kdc,ou=kerberos,dc=example,dc=com
	81	+userPassword: {SSHA}<password-hash>
	82	+description: Kerberos KDC Account
74	74
75		-(% style="color:#400" %)
76		-##{{{dn: cn=kadmin,ou=kerberos,dc=example,dc=com}}}##
77		-##{{{cn: kadmin}}}##
78		-##{{{sn: kadmin}}}##
79		-##{{{objectClass: person}}}##
80		-##{{{objectClass: pwdPolicy}}}##
81		-##{{{pwdAttribute: userPassword}}}##
82		-##{{{pwdMinLength: 8}}}##
83		-##{{{pwdCheckQuality: 2}}}##
84		-##{{{pwdPolicySubentry: cn=kadmin,ou=kerberos,dc=example,dc=com}}}##
85		-##{{{userPassword: {SSHA}<password-hash>}}}##
86		-##{{{description: Kerberos KDC Account}}}##
87		-##{{{EOF}}}##
88		-##{{{Enter LDAP Password:}}}##
	84	+dn: cn=kadmin,ou=kerberos,dc=example,dc=com
	85	+cn: kadmin
	86	+sn: kadmin
	87	+objectClass: person
	88	+objectClass: pwdPolicy
	89	+pwdAttribute: userPassword
	90	+pwdMinLength: 8
	91	+pwdCheckQuality: 2
	92	+pwdPolicySubentry: cn=kadmin,ou=kerberos,dc=example,dc=com
	93	+userPassword: {SSHA}<password-hash>
	94	+description: Kerberos KDC Account
	95	+}}}##
89	89
90		-(% style="color:#400" %)
91		-##{{{adding new entry "ou=kerberos,dc=example,dc=com"}}}##
	97	+Apply it with
92	92
93	93	(% style="color:#400" %)
94		-##{{{adding new entry "cn=kdc,ou=kerberos,dc=example,dc=com"}}}##
	100	+##{{{
	101	+$ ldapadd -H ldaps://nas.example.com/ -D uid=root,cn=users,dc=example,dc=com -W -f step2.ldif
	102	+Enter LDAP Password:
95	95
96		-(% style="color:#400" %)
97		-##{{{adding new entry "cn=kadmin,ou=kerberos,dc=example,dc=com"}}}##
	104	+adding new entry "ou=kerberos,dc=example,dc=com"
98	98
	106	+adding new entry "cn=kdc,ou=kerberos,dc=example,dc=com"
99	99
100		-Synology LDAP server did not like adding users with placeholder passwords, because Synology puts in place password policies. Hence changing this to a ##cn## instead of a ##uid##. It seems to have worked out fine as my KDC is fully functioning.
	108	+adding new entry "cn=kadmin,ou=kerberos,dc=example,dc=com"
	109	+}}}##
101	101
102	102
	112	+
103	103	=== Grant kdc and kadmin permissions ===
104	104
105	105	This switches back to the ##cn=config## DN as you are changing the permissions.