[Fedora-directory-users] aliasedObjectName problem

[tamarin p]

2009/4/22 Rich Megginson <rmeggins at redhat.com>

> tamarin p wrote:
>
>>
>> 2009/4/21 Rich Megginson <rmeggins at redhat.com <mailto:rmeggins at redhat.com
>> >>
>>
>>    tamarin p wrote:
>>
>>        I'm running into some problems when trying to add some alias
>>        entries and importing with ldapmodify or ldif2db. I'm using
>>        the directory server version 1.2.0.
>>
>>        Example of LDIF
>>        dn:
>>        aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=com
>>        changetype: add
>>        aliasedObjectName: ou=foo,dc=test,dc=com
>>        objectClass: top
>>        objectClass: alias
>>
>>        When I run this I get:
>>        ldapmodify: Object class violation (65)
>>               additional info: single-valued attribute
>>        "aliasedObjectName" has multiple values
>>
>>        Same when I use ldif2db.. What am I doing wrong?
>>
>>
>> The application running on top of the ldap uses aliases as pointers and
>> the objectclass exists in the schemata for FDS, so there isnt a requirement
>> that the aliases get dereferenced by the ldap. In any case it currently uses
>> an older fedorads version.
>>
>> I discovered that that if I changed dn:
>> aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=com in the LDIF
>> to dn: aliasedobjectname=ou=foo\,dc=test\,dc=com,ou=bar,ou=test,dc=com
>> (escape the commas instead of surrounding "" for the alias part in the dn),
>> then I could add the entry and it seems to look ok in an ldap browser and
>> satisfy whatever it is the application uses it for. Should the two be
>> considered equivalent?
>>
> Yes.  The double quoted style is deprecated - the \ escapes should be used
> instead.
>
>>
>> Then, when I dump the database to ldif with db2ldif, the entry is
>> represented the same way: escaped comma for the alias part. One Strange
>> thing is I could have sworn I added the same ldif with ""-aliases in FDS
>> 1.1.3 and not only that: The ldif itself is actually dumped from a FDS 7.x
>> server (which has schema checking off, if that could explain how they the
>> entries were added in the first place).
>>
> I don't believe it has anything to do with schema checking.
>
>> Were there any changes between 1.1.3 and 1.2.0 that could explain this?
>>
> Not that I am aware of.  I think we did fix some bugs in DN parsing and
> normalization - it's possible we broke the double quote behavior.
>
>> Also it does not appear to have broken replication of those aliases
>> (tested with a quick replica initialize that I didn't run long enough to
>> finish more than 20% of the db, I'll run the whole init tonight) between the
>> 7.x and 1.2.0 server so maybe it's just tools issue.. but if so it happened
>> with both ldif2db and ldapmodify from openldap-clients.
>>
>
Resurrecting another old thread here, but I ran into something i shouldve
thought of much sooner.

Basically we were hoping to use replication to migrate the data from an old
ldap. the reason is that the directory is big and a regular ldif import
would require the site to be offline (or read-only) for several hours. But
with replication we could just let it "run in the background" until we're
ready to swap the servers and downtime would be minimal. Trouble is we have
thousands of entries like the one here:
dn: aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=com

These can't be added with ldap (ldapadd, ldif2db etc) anymore, but for some
reason they replicate/initialize over without a problem. So for a while it
seemed possible to take this migration path with FDS 1.2.0 as desired. But
then I ran into a problem when testing a backup scripts: It seems an entry
maintains the syntax it was "added with" instead of being dumped later with
"canonical" syntax. Using replication to copy the data then, we of get a
fully consistent directory that works perfectly, but alias entries keep
their deprecated syntax when ldif exported which means: running db2ldif on
the NEW server will print ldif aliasedobjectname entries that cannot be
re-added with ldif2db later because they're in the "broken" syntax. This
makes it impossible to restore from that ldif backup later without first
converting these to the \, escaped commas syntax. running ldif2db on it
unmodified just gives errors like this:
Entry "aliasedobjectname=\22ou=foo,dc=test,dc=com\22,ou=bar,ou=test,dc=com"
single-valued attribute "aliasedObjectName" has multiple values
import userRoot: WARNING: skipping entry
"aliasedobjectname=\22ou=foo,dc=test,dc=com\22,ou=bar,ou=test,dc=com" which
violates schema, ending line 123 of file /tmp/myldif.ldif.

I did some testing with ldapmodify with the following entry.
dn: aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=comaliasedObjectName:
ou=foo,dc=test,dc=com
objectClass: top
objectClass: alias

If I add that entry after disabling schema checking, the entry can be added
and the result in the directory is this. Note two aliasedObjectName attrs,
one is wrong.:
dn: aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=com
aliasedObjectName:
ou=foo,dc=test,dc=com
aliasedObjectName: "ou=foo,dc=test,dc=com"
objectClass: top
objectClass: alias

I then tried adding this entry again with no aliasedObjectName attribute.
This will work also with schema checking on:
dn: aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=com
objectClass:
top
objectClass: alias

And the result is this, which works even with schema checking on but yields
the wrong aliaseObjectName attr (the "" shouldn't be there):
dn: aliasedobjectname="ou=foo,dc=test,dc=com",ou=bar,ou=test,dc=com
aliasedObjectName:
"ou=foo,dc=test,dc=com"
objectClass: top
objectClass: alias

For some reason, it's perfectly fine from the directory point of view when
you replicate instead of ldifimport (until you try to import/export to ldif)
so I assume there's some difference in how entries are parsed and added for
the two methods there. Don't know if any of this tells you anything, just
thought I should mention my findings.

I'm now searching for a workaround that would allow me to still use
replication for the migration step. is there f.ex. a way to make the server
normalize either on input or output when doing ldif import/export? can you
see a better option than to fall back on ldif processing/converting?. So far
the only alternative to ldif processing I see is a script to walk the whole
directory and modify the aliasedObjectName after replica initialization is
complete at some point and the replication agreement is removed.
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