Hi Emily,
By default SCEP could take a challengePassword (internally 
"challengePhrase") that you could map with the host id, which is what 
the FlatFile authentication does.  However, the directory based 
authenticator handles literally "uid" and "pwd".  You will need to get
challengePhrase mapped to pwd into the request, and to do that you could 
write a plugin for it.
I think you could try editing the following file
server/cms/src/com/netscape/cms/servlet/cert/scep/CRSEnrollment.java
to get "uid" and "pwd' filled in the request.
We have professional services that could help write plugins.
Christina
On 05/01/2015 12:34 PM, Emily Stemmerich wrote:
 Hi,
 I was wondering if anyone could offer some assistance with getting 
 SCEP working with LDAP auth?
 Thanks!
 -Emily
 Date: Monday, April 27, 2015 at 4:53 PM
 To: "pki-users(a)redhat.com <mailto:pki-users@redhat.com>" 
 <pki-users(a)redhat.com <mailto:pki-users@redhat.com>>
 Subject: [Pki-users] SCEP directory authentication
 Hi,
 I am still trying to get Dogtag 10.2.1 on Fedora 21 working to allow 
 for router identity certificates obtained by Cisco Routers via SCEP to 
 be auto-renewing.  I have found that the one-time pin model doesn’t 
 work for auto-renewal.  I was pointed to the RedHat document below 
 that discusses using directory-based auth in Section 8.2.1, but I’m 
 having issues with getting it to work.
https://access.redhat.com/documentation/en-US/Red_Hat_Certificate_System/...
 I’m not certain what to put in the dnpattern attribute and there are 
 no examples I can find and am wondering if it is the reason attempts 
 show uid and credentials as null from the router – details of the 
 setup later on in this email.
  *
     *dnpattern.* Specifies a string representing a subject name
     pattern to formulate from the directory attributes and entry DN.
 ------------------------------------------
 From my CS.conf (RouterAuth is then referenced in the caRouterCert.cfg 
 instead of flatfile):
 auths.instance.RouterAuth.pluginName=UidPwdDirAuth
 auths.instance.RouterAuth.ldap.basedn=ou=RouterID,dc=auth,dc=sample,dc=com
 auths.instance.RouterAuth.ldap.ldapconn.host=localhost
 auths.instance.RouterAuth.ldap.ldapconn.port=389
 auths.instance.RouterAuth.ldap.ldapconn.secureConn=false
 ------------------------------------------
 I’ve created a hierarchy outside of dogtag for doing router auth:
 ou=RouterID,dc=auth,dc=sample,dc=com
 ------------------------------------------
 Test User Account (I am not sure what objectClass to use, so I found 
 one with uid and password as options and used that):
 dn: uid=172.18.240.11,ou=RouterID,dc=auth,dc=sample,dc=com
 uid: 172.18.240.11
 |objectClass: inetUser|
 userPassword: testpass
 ------------------------------------------
 Router config.  For flatfile auth it ends up using the wan IP and the 
 password and password in the identity section, however for LDAP auth I 
 don’t know what things would map to:
 crypto ca identity SAMPLE
 enrollment url 
http://172.21.4.239:8080/ca/cgi-bin
 revocation-check none
 fqdn 
emilyvpn.sample.com
 serial-number none
 ip-address none
 hash sha256
 password testpass
 rsakeypair  MEVO 2048
 auto-enroll 75
 crl optional
 exit
 crypto ca authenticate SAMPLE
 ------------------------------------------
 When I try and get a cert from the Cisco Router I get output like the 
 following in the debug file that lists both UID and credential as null:
 [24/Apr/2015:16:31:18][http-bio-8080-exec-7]: Got 
 authenticator=com.netscape.cms.authentication.UidPwdDirAuthentication
 [24/Apr/2015:16:31:18][http-bio-8080-exec-7]: LdapAnonConnFactory::getConn
 [24/Apr/2015:16:31:18][http-bio-8080-exec-7]: 
 LdapAnonConnFactory.getConn(): num avail conns now 4
 [24/Apr/2015:16:31:18][http-bio-8080-exec-7]: Authenticating UID=null
 [24/Apr/2015:16:31:19][http-bio-8080-exec-7]: returnConn: mNumConns now 4
 [24/Apr/2015:16:31:19][http-bio-8080-exec-7]: operation failure - 
 Authentication credential for uid is null.
 [24/Apr/2015:16:31:19][http-bio-8080-exec-7]: Output PKIOperation 
 response:
 Thanks for any assistance,
 -Emily