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Add documentation for an LDAP setup against Active Directory

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Since our documentation on our LDAP configs is quite small, I add this
example for LDAP in an Active Directory environment.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>
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Sheogorath 2018-09-26 19:08:50 +02:00
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AD LDAP auth
===
To setup your CodiMD instance with Active Directory you need the following configs:
```
CMD_LDAP_URL=ldap://internal.example.com
CMD_LDAP_BINDDN=cn=binduser,cn=Users,dc=internal,dc=example,dc=com
CMD_LDAP_BINDCREDENTIALS=<super secret password>
CMD_LDAP_SEARCHBASE=dc=internal,dc=example,dc=com
CMD_LDAP_SEARCHFILTER=(&(objectcategory=person)(objectclass=user)(|(sAMAccountName={{username}})(mail={{username}})))
CMD_LDAP_USERIDFIELD=sAMAccountName
CMD_LDAP_PROVIDERNAME=Example Inc AD
```
`CMD_LDAP_BINDDN` is either the `distinguishedName` or the `userPrincipalName`. *This can cause "username/password is invalid" when either this value or the password from `CMD_LDAP_BINDCREDENTIALS` are incorrect.*
`CMD_LDAP_SEARCHFILTER` matches on all users and uses either the email address or the `sAMAccountName` (usually the login name you also use to login to Windows).
*Only using `sAMAccountName` looks like this:* `(&(objectcategory=person)(objectclass=user)(sAMAccountName={{username}}))`
`CMD_LDAP_USERIDFIELD` says we want to use `sAMAccountName` as unique identifier for the account itself.
`CMD_LDAP_PROVIDERNAME` just the name written above the username and password field on the login page.
Same in json:
```json
"ldap": {
"url": "ldap://internal.example.com",
"bindDn": "cn=binduser,cn=Users,dc=internal,dc=example,dc=com",
"bindCredentials": "<super secret password>",
"searchBase": "dc=internal,dc=example,dc=com",
"searchFilter": "(&(objectcategory=person)(objectclass=user)(|(sAMAccountName={{username}})(mail={{username}})))",
"useridField": "sAMAccountName",
},
```
More details and example: https://www.npmjs.com/package/passport-ldapauth