On Mon, 29 Oct 2012, Simo Sorce wrote:
On Mon, 2012-10-29 at 19:59 +0200, Alexander Bokovoy wrote:
A sequence is following:
1. Match external member against existing trusted domain
2. Find trusted domain's domain controller
3. Fetch trusted domain account auth info
4. Set up ccache in /var/run/ipa/ipa_memcached/krb5cc_TRUSTEDDOMAIN with 
principal ourdomain$@trusted.domain
5. Do LDAP SASL interactive bind using the ccache
6. Search for the member's SID
7. Decode SID
8. Replace external member name by SID

https://fedorahosted.org/freeipa/ticket/3211
---
 ipalib/plugins/group.py    |  32 +++++----
 ipaserver/dcerpc.py        | 172 +++++++++++++++++++++++++++++++++++++++++----
 ipaserver/plugins/ldap2.py |   3 +
 3 files changed, 181 insertions(+), 26 deletions(-)

diff --git a/ipalib/plugins/group.py b/ipalib/plugins/group.py
index 
a174ba62cc32a7fb83474f52e2621521553889af..f86b134e61fc8c7518a64d25329babee3398c6ef
 100644
--- a/ipalib/plugins/group.py
+++ b/ipalib/plugins/group.py
@@ -83,28 +83,30 @@ External members should be added to groups that 
specifically created as
 external and non-POSIX. Such group later should be included into one of POSIX
 groups.

-An external group member is currently a Security Identifier as defined by
-the trusted domain.
+An external group member is currently a Security Identifier (SID) as defined by
+the trusted domain. When adding external group members, it is possible to
+specify them in either SID, or DOM\\name, or name@domain format. IPA will 
attempt
+to resolve passed name to SID with the use of Global Catalog of the trusted 
domain.

 Example:

-1. Make note of the trusted domain security identifier
-
-   domainsid = `ipa trust-show <ad.domain> | grep Identifier | cut -d: -f2`
-
-2. Create group for the trusted domain admins' mapping and their local POSIX 
group:
+1. Create group for the trusted domain admins' mapping and their local POSIX 
group:

    ipa group-add --desc='<ad.domain> admins external map' ad_admins_external 
--external
    ipa group-add --desc='<ad.domain> admins' ad_admins

-3. Add security identifier of Domain Admins of the <ad.domain> to the 
ad_admins_external
-   group (security identifier of <ad.domain SID>-513 is Domain Admins group):
+2. Add security identifier of Domain Admins of the <ad.domain> to the 
ad_admins_external
+   group:

-   ipa group-add-member ad_admins_external --external ${domainsid}-513
+   ipa group-add-member ad_admins_external --external 'AD\\Domain Admins'

-4. Allow members of ad_admins_external group to be associated with ad_admins 
POSIX group:
+3. Allow members of ad_admins_external group to be associated with ad_admins 
POSIX group:

    ipa group-add-member ad_admins --groups ad_admins_external
+
+4. List members of external members of ad_admins_external group to see their 
SIDs:
+
+   ipa group-show ad_admins_external
 """)

A text similar to this is available when you run ipa help trust, I guess
you should change that one too.
Right. I'll fix that.


I am trying to add a windows group now and getting this trace in my http
server:

[Mon Oct 29 16:15:33 2012] [error] ipa: ERROR: release_ipa_ccache:
ccache_name (FILE:/var/run/ipa_memcached/krbcc_20825) != KRB5CCNAME
environment variable (/var/run/ipa/ipa_memcached/krb5cc_TRUSTEDDOMAIN)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240] mod_wsgi 
(pid=20825): Exception occurred processing WSGI script '/usr/share/ipa/wsgi.py'.
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240] Traceback (most 
recent call last):
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/share/ipa/wsgi.py", line 49, in application
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     return 
api.Backend.wsgi_dispatch(environ, start_response)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 248, in __call__
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     return 
self.route(environ, start_response)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 260, in route
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     return 
app(environ, start_response)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 1158, in 
__call__
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     response = 
super(xmlserver_session, self).__call__(environ, start_response)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 707, in __call__
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     response = 
super(xmlserver, self).__call__(environ, start_response)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 375, in __call__
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     response = 
self.wsgi_execute(environ)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 334, in 
wsgi_execute
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     result = 
self.Command[name](*args, **options)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 435, in __call__
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     ret = 
self.run(*args, **options)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 747, in run
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     return 
self.execute(*args, **options)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipalib/plugins/baseldap.py", line 1590, in 
execute
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     **options)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipalib/plugins/group.py", line 387, in 
post_callback
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     actual_sid = 
domain_validator.get_sid_trusted_domain_object(sid)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/dcerpc.py", line 227, in 
get_sid_trusted_domain_object
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     entry = 
self.__resolve_against_gc(info, components['name'])
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/dcerpc.py", line 279, in 
__resolve_against_gc
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     
conn.sasl_interactive_bind_s(None, sasl_auth)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib/python2.7/site-packages/ipaserver/plugins/ldap2.py", line 562, in 
sasl_interactive_bind_s
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     return 
self.conn.sasl_interactive_bind_s(who, auth, serverctrls, clientctrls, 
sasl_flags)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib64/python2.7/site-packages/ldap/ldapobject.py", line 229, in 
sasl_interactive_bind_s
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     return 
self._ldap_call(self._l.sasl_interactive_bind_s,who,auth,RequestControlTuples(serverctrls),RequestControlTuples(clientctrls),sasl_flags)
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]   File 
"/usr/lib64/python2.7/site-packages/ldap/ldapobject.py", line 99, in _ldap_call
[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]     result = 
func(*args,**kwargs)

[Mon Oct 29 16:15:33 2012] [error] [client 192.168.122.240]
LOCAL_ERROR: {'info': 'SASL(-1): generic failure: GSSAPI Error:
Unspecified GSS failure.  Minor code may provide more information
(Cannot determine realm for numeric host address)', 'desc': 'Local
error'}
Somehow name resolution failed for you -- you probably need to restart
named before it actually would start working. I had similar issues with
caching of forwarder rules.

--
/ Alexander Bokovoy

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