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		-(% style="color:red" %)
9		-##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
	7	+'''
	8	+$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif
	9	+'''
10	10
11		-
12	12	Then load the ##kerberos## schema:
13	13
14		-(% style="color:red" %)
15		-##{{{$ 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}}}##
16		-##{{{Enter LDAP Password:}}}##
17		-##{{{adding new entry "cn=kerberos,cn=schema,cn=config"}}}##
18		-##{{{$}}}##
	13	+'''
	14	+$ 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
	15	+Password:
19	19
	17	+adding new entry "cn=kerberos,cn=schema,cn=config"
	18	+'''
20	20
21		-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##:
22	22
23		-(% style="color:red" %)
24		-##{{{$ ldapmodify -H ldap://nas.fqhn/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
25		-##{{{dn: olcDatabase={1}bdb,cn=config}}}##
26		-##{{{add: olcDbIndex}}}##
27		-##{{{olcDbIndex: krbPrincipalName eq,pres,sub}}}##
28		-##{{{EOF}}}##
29		-##{{{Enter LDAP Password:}}}##
30		-##{{{modifying entry "olcDatabase={1}bdb,cn=config"}}}##
31		-##{{{$}}}##
32	32
	22	+And add an index on the ##krbPrincipalName## (improves performance and also suppresses some log messages if ##slapd## is configured to log more than default) for the database(s) where you intend to store Kerberos data:
33	33
34		-Next, you need to create and configure two entries which will be used by the Kerberos servers to connect to OpenLDAP. As you will not run the Kerberos KDC and Admin Server on the same host as OpenLDAP, these steps are required. In order to keep things nicely separated, everything will be created under a separate ##organizationalUnit##.
	24	+{{{# ldapmodify -H ldap:~/~/nas.fqhn <<EOF
35	35
36		-(% style="color:red" %)
37		-##{{{$ ldapadd -H ldap://nas.fqhn/ -D uid=root,cn=users,dc=example,dc=com -W <<EOF}}}##
38		-##{{{dn: ou=Services,dc=example,dc=com}}}##
39		-##{{{objectClass: organizationalUnit}}}##
40		-##{{{objectClass: top}}}##
41		-##{{{ou: Services}}}##
42		-## ##
43		-##{{{dn: ou=kerberos,ou=Services,dc=example,dc=com}}}##
44		-##{{{objectClass: organizationalUnit}}}##
45		-##{{{objectClass: top}}}##
46		-##{{{ou: kerberos}}}##
47		-## ##
48		-##{{{dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com}}}##
49		-##{{{uid: kdc}}}##
50		-##{{{objectClass: account}}}##
51		-##{{{objectClass: simpleSecurityObject}}}##
52		-##{{{userPassword: {CRYPT}x}}}##
53		-##{{{description: Kerberos KDC Account}}}##
54		-## ##
55		-##{{{dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
56		-##{{{uid: kadmin}}}##
57		-##{{{objectClass: account}}}##
58		-##{{{objectClass: simpleSecurityObject}}}##
59		-##{{{userPassword: {CRYPT}x}}}##
60		-##{{{description: Kerberos Admin Server Account}}}##
61		-##{{{EOF}}}##
62		-##{{{Enter LDAP Password:}}}##
63		-## ##
64		-##{{{adding new entry "ou=Services,dc=example,dc=com"}}}##
65		-## ##
66		-##{{{adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"}}}##
67		-## ##
68		-##{{{adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"}}}##
69		-## ##
70		-##{{{adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}##
	26	+dn: olcDatabase={1}bdb,cn=config
71	71
	28	+add: olcDbIndex
72	72
73		-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:
	30	+olcDbIndex: krbPrincipalName eq,pres,sub
74	74
75		-(% style="color:red" %)
76		-##{{{dn: cn=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
77		-##{{{sn: kadmin}}}##
78		-##{{{cn: kadmin}}}##
79		-##{{{objectClass: person}}}##
80		-##{{{objectClass: pwdPolicy}}}##
81		-##{{{pwdAttribute: userPassword}}}##
82		-##{{{pwdMinLength: 8}}}##
83		-##{{{pwdCheckQuality: 2}}}##
84		-##{{{pwdPolicySubentry: cn=kadmin,ou=kerberos,ou=Services,dc=example,dc=com}}}##
85		-##{{{userPassword: {SSHA}<hashed password>}}}##
86		-##{{{description: Kerberos Admin Server Account}}}##
	32	+EOF
87	87
88		-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. As an aside, I am not sure it is required to have two nested Organisation Units, ##Services## and ##kerberos## - so I will likely re-deploy and get rid of the ##Services## Organisational Unit altogether. It shortens the DN's used for binds to LDAP and limits the risk for typos. I also find it highly unlikely that deploying this in a real organisation that there would be an existing Organisational Unit called '##kerberos##' while the risk for there being an existing department called '##Services##' is much more likely.
	34	+modifying entry "olcDatabase={1}bdb,cn=config"
89	89
	36	+}}}
	37	+
	38	+
	39	+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:
	40	+
	41	+
	42	+{{{# ldapadd -x -D cn=admin,dc=example,dc=com -W <<EOF
	43	+dn: ou=Services,dc=example,dc=com
	44	+objectClass: organizationalUnit
	45	+objectClass: top
	46	+ou: Services
	47	+
	48	+dn: ou=kerberos,ou=Services,dc=example,dc=com
	49	+objectClass: organizationalUnit
	50	+objectClass: top
	51	+ou: kerberos
	52	+
	53	+dn: uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com
	54	+uid: kdc
	55	+objectClass: account
	56	+objectClass: simpleSecurityObject
	57	+userPassword: {CRYPT}x
	58	+description: Kerberos KDC Account
	59	+
	60	+dn: uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com
	61	+uid: kadmin
	62	+objectClass: account
	63	+objectClass: simpleSecurityObject
	64	+userPassword: {CRYPT}x
	65	+description: Kerberos Admin Server Account
	66	+EOF
	67	+Enter LDAP Password: SECRET
	68	+
	69	+adding new entry "ou=Services,dc=example,dc=com"
	70	+
	71	+adding new entry "ou=kerberos,ou=Services,dc=example,dc=com"
	72	+
	73	+adding new entry "uid=kdc,ou=kerberos,ou=Services,dc=example,dc=com"
	74	+
	75	+adding new entry "uid=kadmin,ou=kerberos,ou=Services,dc=example,dc=com"}}}
	76	+
	77	+
90	90