Changes for page KerberosAndLDAP

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1		-{{box cssClass="floatinginfobox" title="**Contents**"}}
2	2	{{toc/}}
3		-{{/box}}
4	4
5	5	= Debian =
6	6
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13	13	**The guide is for illustration. Expectation is that you do not follow it verbatim but adapt it to your needs.**
14	14
15	15
16		-=== Install packages: ===
	14	+===== Install packages: =====
17	17
18	18	(% class="wikigeneratedid" %)
19	19	The packages you need are [[krb5-kdc-ldap>>url:https://packages.debian.org/krb5-kdc-ldap]], [[krb5-admin-server>>url:https://packages.debian.org/krb5-admin-server]] for the actual KDC and [[schema2ldif>>url:https://packages.debian.org/schema2ldif]]  plus [[slapd>>https://packages.debian.org/search?keywords=slapd]] for adding the schema and ##slappasswd##. They are to be installed on your designated Debian host.
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22	22	##{{{$ sudo apt install krb5-kdc-ldap krb5-admin-server schema2ldif}}}##
23	23
24	24
25		-=== Load ##kerberos LDAP## schema: ===
	23	+===== Load ##kerberos LDAP## schema: =====
26	26
27	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.
28	28
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33	33	##{{{$}}}##
34	34
35	35
36		-=== Create Index on krbPrincipalName: ===
	34	+===== Create Index on krbPrincipalName: =====
37	37
38	38	Having an index on the ##krbPrincipalName## improves performance and also suppresses some log messages if ##slapd## is configured to log more than default for the database(s) where you intend to store Kerberos data. As this is OpenLDAP on the Synology, it does not use ##mdb## format, it uses ##bdb##. If you install ##slapd## on Debian, it uses ##mdb## format. It is different database format, but the principle is the same. Again, as you are modifying config, the DN is ##cn=config##. Interestingly, it is still the main password you set for the Synology LDAP server.
39	39
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48	48	##{{{$}}}##
49	49
50	50
51		-=== Create principals kadmin and kdc: ===
	49	+===== Create principals kadmin and kdc: =====
52	52
53	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}##.
54	54
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96	96	(% style="color:#400" %)
97	97	##{{{adding new entry "cn=kadmin,ou=kerberos,dc=example,dc=com"}}}##
98	98
99		-
100	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.
101	101
102		-
103		-=== Grant kdc and kadmin permissions: ===
104		-
105		-This switches back to the ##cn=config## DN as you are changing the permissions.
106		-
107		-$ ldapmodify -H ldaps:~/~/ds723.trudheim.com -W -D cn=config <<EOF
108		-
109		-dn: olcDatabase={1}bdb,cn=config
110		-add: olcAccess
111		-olcAccess: {0}to attrs=krbPrincipalKey
112		- by anonymous auth
113		- by dn.exact="cn=kdc,ou=kerberos,dc=trudheim,dc=com" write
114		- by dn.exact="cn=kadmin,ou=kerberos,dc=trudheim,dc=com" write
115		- by self write
116		- by * none
117		--
118		-add: olcAccess
119		-olcAccess: {1}to dn.subtree="cn=krbContainer,ou=kerberos,dc=example,dc=com"
120		- by dn.exact="cn=kdc,ou=kerberos,dc=trudheim,dc=com" write
121		- by dn.exact="cn=kadmin,ou=kerberos,dc=trudheim,dc=com" write
122		- by * none
123		-
124		-EOF
125		-
126		-Enter LDAP Password:
127		-modifying entry "olcDatabase={1}bdb,cn=config"
128		-
129		-$
130		-
131		-
132		-Note that we now reference our kdc and kadmin accounts and we grant them permission to the krbContainer which will house all our kerberos principals. Give both of them write access, because we do want to have the ability to track last login and lock accounts if there are login failures. We like security.
133		-
134		-
135		-=== Create krb5.conf: ===
136		-
137		-Over to adjusting /etc/krb5.conf so that it will point to the right thing later. It should look something like this:
138		-
139		-
140		-{{{[libdefaults]
141		- default_realm = EXAMPLE.COM
142		- dns_lookup_realm = false
143		- dns_lookup_kdc = false
144		- ticket_lifetime = 24h
145		- forwardable = true
146		- proxiable = true
147		- rdns = false
148		-
149		-[realms]
150		- EXAMPLE.COM = {
151		- kdc = debian.example.com
152		- admin_server = debian.example.com
153		- default_domain = example.com
154		- }
155		- [domain_realm]
156		- .example.com = EXAMPLE.COM
157		- example.com = EXAMPLE.COM}}}
158		-
159		-Make sure your designated debian server have ports 88, 464 and 749 open, both for TCP and UDP, in its firewall. 88 is for the kdc, 464 and 749 is for kadmin.
160		-
161		-
162		-=== Create kdc.conf: ===
163		-
164		-Next, we need to write up /etc/krb5kdc/kdc.conf. Something like this should work
165		-
166		-
167		-[libdefaults]
168		-
169		-[realms]
170		- TRUDHEIM.COM = {
171		- database_module = openldap_ldapconf
172		- max_life = 7d
173		- max_renewable_life = 6d
174		- }
175		-
176		-[dbdefaults]
177		- ldap_kerberos_container_dn = cn=krbContainer,ou=kerberos,dc=trudheim,dc=com
178		-
179		-[dbmodules]
180		- openldap_ldapconf = {
181		- db_library = kldap
182		- disable_last_success = false
183		- disable_lockout = false
184		- ldap_conns_per_server = 5
185		- ldap_servers = ldaps:~/~/ds723.trudheim.com
186		- ldap_kdc_dn = "cn=kdc,ou=kerberos,dc=trudheim,dc=com"
187		- ldap_kadmind_dn = "cn=kadmin,ou=kerberos,dc=trudheim,dc=com"
188		- ldap_service_password_file = /etc/krb5kdc/service.keyfile
189		- }
190		-
191		-
192		-=== Create kadm5.acl: ===
193		-
194		-Then you need to create ##/etc/krb5kdc/kadm5.acl and put in it##
195		-
196		-##*/admin@EXAMPLE.COM *##
197		-
198		-
199		-so that administrator principals can run kadmin. Now we are ready to create the domain. And that we do with
200		-
201		-
202		-=== Create the kerberos domain: ===
203		-
204		-#
205		-
206		-kdb5_ldap_util -D uid=root,cn=users,dc=trudheim,dc=com -H ldaps:~/~/ds723.trudheim.com -r TRUDHEIM.COM create -subtrees dc=trudheim,dc=com -maxtktlife '7 Days' -maxrenewlife '6 Days' -s
207		-Password for "uid=root,cn=users,dc=trudheim,dc=com":
208		-Initializing database for realm 'TRUDHEIM.COM'
209		-You will be prompted for the database Master Password.
210		-It is important that you NOT FORGET this password.
211		-Enter KDC database master key:
212		-Re-enter KDC database master key to verify:
213		-
214		-kdb5_ldap_util -D uid=root,cn=users,dc=trudheim,dc=com -H ldaps:~/~/ds723.trudheim.com stashsrvpw -f /etc/krb5kdc/service.keyfile cn=kdc,ou=kerberos,dc=trudheim,dc=com
215		-Password for "uid=root,cn=users,dc=trudheim,dc=com":
216		-Password for "cn=kdc,ou=kerberos,dc=trudheim,dc=com":
217		-Re-enter password for "cn=kdc,ou=kerberos,dc=trudheim,dc=com":
218		-
219		-kdb5_ldap_util -D uid=root,cn=users,dc=trudheim,dc=com -H ldaps:~/~/ds723.trudheim.com stashsrvpw -f /etc/krb5kdc/service.keyfile cn=kadmin,ou=kerberos,dc=trudheim,dc=com
220		-Password for "uid=root,cn=users,dc=trudheim,dc=com":
221		-Password for "cn=kadmin,ou=kerberos,dc=trudheim,dc=com":
222		-Re-enter password for "cn=kadmin,ou=kerberos,dc=trudheim,dc=com":
223		-
224		-
225		-=== Create the first principals: ===
226		-
227		-