[SSSD] [PATCHSET] LDAP: sanitize group name when used in filter

Pavel Březina pbrezina at redhat.com
Wed Aug 5 12:44:39 UTC 2015


On 08/05/2015 12:11 PM, Pavel Reichl wrote:
>
>
> On 08/05/2015 11:34 AM, Pavel Březina wrote:
>> On 08/04/2015 03:52 PM, Pavel Reichl wrote:
>>> Hello,
>>>
>>> please see 2 simple patches attached.
>>>
>>> I could not find function to sanitize DN so it could be used as part of
>>> filter (sanitize ()*/\...) so I had to write one.
>>>
>>>   sysdb_dn_sanitize is not the right choice,
>>>
>>> sysdb_dn_sanitize("name=expired-group(2016),cn=groups,cn=LOCAL,cn=sysdb")
>>> ->
>>> "name\\3Dexpired-group(2016)\\,cn\\3Dgroups\\,cn\\3DLOCAL\\,cn\\3Dsysdb"
>>>
>>> Thanks!
>>
>> Hi, I did just a quick read of your patches... can you take one more
>> step with creating a sanitized dn and create a more generic function
>> for that?
>>
>> Have you considered to modify sysdb_dn_sanitize to also escape
>> parentheses (that's what is misssing, isn't it)?
> no because sysdb_dn_sanitize escapes also ',' and '=' and I need them to
> stat as they are
>
> This is what I have: "name=expired-group(2016),cn=groups,cn=LOCAL,cn=sysdb"
> This is what I need:
> "name=expired-group\282016\29,cn=groups,cn=LOCAL,cn=sysdb"  // just
> escape '(' and ')'
> This is what sysdb_dn_sanitize returns:
> "name\\3Dexpired-group(2016)\\,cn\\3Dgroups\\,cn\\3DLOCAL\\,cn\\3Dsysdb"
>
> Failing filter:
> (&(objectClass=user)(|(memberOf=name=VDI-US02_Corporate-Environment(2013),cn=groups,cn=qut.edu.au,cn=sysdb)
>
> Corrent filter
> (&(objectClass=user)(|(memberOf=name=VDI-US02_Corporate-Environment\282013\29,cn=groups,cn=qut.edu.au,cn=sysdb)
>
>
> I hope it's clearer now.

Of course... sysdb_dn_sanitize is not supposed to be called on the whole 
dn. Just on the name part. It mean "sanitize value so it can be used in 
dn". But changing it to also escape parentheses would require sysdb and 
code update, so it is not worth it.

> +static errno_t
> +get_group_dn_with_filter_sanitized_name(TALLOC_CTX *mem_ctx,
> +                                        struct sss_domain_info *domain,
> +                                        const char *grp_name,
> +                                        const char **_grp_dn);

Can you use group_name and _group_dn? Two characters won't kill anybody 
:-) Otherwise we can keep the code as is. I have just one recommendation 
for tests:

> +    /* let records to expire */
> +    usleep(1100000);

It will be better to expire the records manually by setting expiration 
time to zero. I'm not sure if we have already a function for that, if 
not, please write one. It may be quite useful for tests.







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