Changes for page KerberosAndLDAP

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2	2
3	3	The guide I followed was [[https:~~/~~/wiki.debian.org/LDAP/OpenLDAPSetup#Kerberos>>https://wiki.debian.org/LDAP/OpenLDAPSetup#Kerberos]] which while it worked required some minor tweaks. I obtained edit privileges for the Debian Wiki and updated the guide with the fixes that I found. I however have a Synology NAS and that can run an LDAP Server. So this guide differs a little from the upstream Debian Guide.
4	4
5		-
6	6	First, install the packages containing the LDAP-enabled Kerberos servers ([[krb5-kdc-ldap>>url:https://packages.debian.org/krb5-kdc-ldap]] and [[krb5-admin-server>>url:https://packages.debian.org/krb5-admin-server]]) and the [[schema2ldif>>url:https://packages.debian.org/schema2ldif]] tool:
7	7
8		-##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
	7	+{{{# apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}
9	9
10		-
11	11	Then load the ##kerberos## schema:
12	12
13		-##{{{$ zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -H ldap://nas.fqdn/ -D uid=root,cn=users,dc=example,dc=com -W}}}##
14		-##{{{Enter LDAP Password:}}}##
15		-##{{{adding new entry "cn=kerberos,cn=schema,cn=config"}}}##
16		-##{{{$}}}##
17	17
	12	+{{{# zcat /usr/share/doc/krb5-kdc-ldap/kerberos.openldap.ldif.gz | ldapadd -Q -Y EXTERNAL -H ldapi:///
	13	+adding new entry "cn=kerberos,cn=schema,cn=config"}}}
18	18
19		-Having an index on the ##krbPrincipalName## improves performance and also suppresses some log messages if ##slapd## is configured to log more than default for the database(s) where you intend to store Kerberos data. As this is OpenLDAP on the Synology, it does not use ##mdb## format, it uses ##bdb##:
	15	+And add an index on the ##krbPrincipalName## (improves performance and also suppresses some log messages if ##slapd## is configured to log more than default) for the database(s) where you intend to store Kerberos data:
20	20
21		-##{{{$ ldapmodify -H ldap://nas.fqhn/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
22		-##{{{dn: olcDatabase={1}bdb,cn=config}}}##
23		-##{{{add: olcDbIndex}}}##
24		-##{{{olcDbIndex: krbPrincipalName eq,pres,sub}}}##
25		-##{{{EOF}}}##
26		-##{{{Enter LDAP Password:}}}##
27		-##{{{modifying entry "olcDatabase={1}bdb,cn=config"}}}##
28		-##{{{$}}}##
29	29
	18	+{{{# ldapmodify -Q -Y EXTERNAL -H ldapi:/// <<EOF
	19	+dn: olcDatabase={1}mdb,cn=config
	20	+add: olcDbIndex
	21	+olcDbIndex: krbPrincipalName eq,pres,sub
	22	+EOF
30	30
31		-Next, you need to create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. As you will not run the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##.
	24	+modifying entry "olcDatabase={1}mdb,cn=config"}}}
32	32
33		-##{{{$ ldapadd -H ldap://nas.fqhn/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
34		-##{{{dn: ou=Services,dc=example,dc=com}}}##
35		-##{{{objectClass: organizationalUnit}}}##
36		-##{{{objectClass: top}}}##
37		-##{{{ou: Services}}}##
38		-## ##
39		-##{{{dn: ou=kerberos,ou=Services,dc=example,dc=com}}}##
40		-##{{{objectClass: organizationalUnit}}}##
41		-##{{{objectClass: top}}}##
42		-##{{{ou: kerberos}}}##
43		-## ##
44		-##{{{dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com}}}##
45		-##{{{uid: kdc}}}##
46		-##{{{objectClass: account}}}##
47		-##{{{objectClass: simpleSecurityObject}}}##
48		-##{{{userPassword: {CRYPT}x}}}##
49		-##{{{description: Kerberos KDC Account}}}##
50		-## ##
51		-##{{{dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
52		-##{{{uid: kadmin}}}##
53		-##{{{objectClass: account}}}##
54		-##{{{objectClass: simpleSecurityObject}}}##
55		-##{{{userPassword: {CRYPT}x}}}##
56		-##{{{description: Kerberos Admin Server Account}}}##
57		-##{{{EOF}}}##
58		-##{{{Enter LDAP Password:}}}##
59		-## ##
60		-##{{{adding new entry "ou=Services,dc=example,dc=com"}}}##
61		-## ##
62		-##{{{adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"}}}##
63		-## ##
64		-##{{{adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"}}}##
65		-## ##
66		-##{{{adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}##
	26	+Next, you need to create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. If you are running Kerberos and OpenLDAP on the same system, these steps are optional, but recommended. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##. Note that a simple bind (##-x -D##) is used instead of an ##EXTERNAL## bind since write access to the dc=example,dc=com DIT is necessary:
67	67
68	68
69		-Now, it was at this point that I had a problem, because the LDAP server on the Synology did not like adding users with placeholder passwords. I ended up working around it using a different construct:
	29	+{{{# ldapadd -x -D cn=admin,dc=example,dc=com -W <<EOF
	30	+dn: ou=Services,dc=example,dc=com
	31	+objectClass: organizationalUnit
	32	+objectClass: top
	33	+ou: Services
70	70
71		-##{{{dn: cn=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
72		-##{{{sn: kadmin}}}##
73		-##{{{cn: kadmin}}}##
74		-##{{{objectClass: person}}}##
75		-##{{{objectClass: pwdPolicy}}}##
76		-##{{{pwdAttribute: userPassword}}}##
77		-##{{{pwdMinLength: 8}}}##
78		-##{{{pwdCheckQuality: 2}}}##
79		-##{{{pwdPolicySubentry: cn=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
80		-##{{{userPassword: {SSHA}<hashed password>}}}##
81		-##{{{description: Kerberos Admin Server Account}}}##
	35	+dn: ou=kerberos,ou=Services,dc=example,dc=com
	36	+objectClass: organizationalUnit
	37	+objectClass: top
	38	+ou: kerberos
82	82
83		-and that seems to have worked out fine as my KDC is fully functioning. It required modifying the rest of the guide with the fact that it no longer was ##uid=kadmin## and ##uid=kdc##, but rather ##cn=kadmin## and ##cn=kdc##. The most important thing is that it works.
	40	+dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com
	41	+uid: kdc
	42	+objectClass: account
	43	+objectClass: simpleSecurityObject
	44	+userPassword: {CRYPT}x
	45	+description: Kerberos KDC Account
	46	+
	47	+dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com
	48	+uid: kadmin
	49	+objectClass: account
	50	+objectClass: simpleSecurityObject
	51	+userPassword: {CRYPT}x
	52	+description: Kerberos Admin Server Account
	53	+EOF
	54	+Enter LDAP Password: SECRET
	55	+
	56	+adding new entry "ou=Services,dc=example,dc=com"
	57	+
	58	+adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"
	59	+
	60	+adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"
	61	+
	62	+adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}
	63	+
	64	+
84	84