On 08/04/2011 02:05 PM, Ian Stokes-Rees wrote:



On 8/3/11 6:13 PM, Dmitri Pal wrote:
On 08/03/2011 10:10 AM, Ian Stokes-Rees wrote:
If there were some way to securely embed an arbitrary string in the
user profile, that would go a long way to solving this problem.  At
least 4KB to cover a 2048 X.509 public key, but ideally 10 KB or
more.  To remove the ACL complexity, just having it accessible only by
the user (token or password based fetch) would be suitable.
Do not quite understand how that would work or what you mean.

I've just realized that I think the functionality I'm looking for is already available. I want the same system that is used for storing passwords. Consider the following trace:

$ ldapsearch -h freeipa -b uid=tester,cn=users,cn=portal,dc=nebiogrid,dc=org -Y GSSAPI -LLL -d 0 -T ~/.ldapresults/

SASL/GSSAPI authentication started
SASL username: ijsto...@nebiogrid.org
SASL SSF: 56
SASL data security layer installed.
dn: uid=tester,cn=users,cn=portal,dc=nebiogrid,dc=org
objectClass: person
objectClass: posixAccount
objectClass: account
objectClass: inetOrgPerson
objectClass: top
objectClass: organizationalPerson
givenName: test
sn: test
cn: test test
mail: meg...@hkl.hms.harvard.edu
uidNumber: 1031
gidNumber: 1031
homeDirectory: /p/home//tester
uid: tester
userPassword:: e2NyeXB0fXNCb2drN3p4c2lha1E=

[aside: I'd love a tip on how to get rid of the non-LDIF SASL headers]

The userpassword (hash) is stored in base-64 format and is only accessible by me because I have permissions to access this. Some other user doing the same query would not get the userPassword attribute. Even better, I can use the "-tt" option to write the base64-decoded content to a file.

The parts of the puzzle that I'd have to work out are:

1. are there objectClass schemas that have fields that would be suitable for a set of common private keys (rsa1, rsa2, dsa, gpg, pgp, and x509)?
x509 schema are included with 389 (05rfc4523.ldif et. al.)
I think there is a schema for storage of ssh keys

2. if not, instructions on how to set up such a schema (basically with exactly the set of attributes above), with the fields being base64 (binary?)
Take a look at the existing schema. For most fields that hold opaque blob data, you will probably want to use OctetString syntax.

3. what do I have to do to get the behavior that only certain parties can read a particular attribute?
Read up on Access Control (acis): http://docs.redhat.com/docs/en-US/Red_Hat_Directory_Server/8.2/html-single/Administration_Guide/index.html#Managing_Access_Control

4. any way to get ldapsearch to write out particular attributes to particular files?
Not really - all you have is -T and -tt
But any non-trivial application is not going to use ldapsearch as the main interface for getting these values. I suggest using python with python-ldap.

Thanks,

Ian


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