[Freeipa-devel] [PATCH] 117 extdom: replace winbind calls with POSIX/SSSD calls

[Alexander Bokovoy]

On Mon, 08 Jul 2013, Jakub Hrozek wrote:
>On Mon, Jul 08, 2013 at 04:15:39PM +0300, Alexander Bokovoy wrote:
>> On Mon, 08 Jul 2013, Alexander Bokovoy wrote:
>> >On Wed, 03 Jul 2013, Sumit Bose wrote:
>> >>Hi,
>> >>
>> >>with this patch the extdom plugin, the LDAP extended operation that
>> >>allows IPA clients with recent SSSD to lookup AD users and groups, will
>> >>not use winbind for the lookup anymore but will use SSSD running in
>> >>ipa_server_mode.
>> >>
>> >>Since now no plugin uses the winbind client libraries anymore, the
>> >>second patch removes the related configures checks.
>> >>
>> >>I think for the time being we cannot remove winbind completely because
>> >>it might be needed for msbd to work properly in a trusted environment.
>> >s/msbd/smbd/
>> >
>> >ACK. I need to add 'ipa_server_mode = True' support to
>> >the installer code and then these patches can go in.
>> Actually, the code still doesn't work due to some bug in sssd which
>> fails to respond properly to getsidbyname() request in libsss_nss_idmap.
>>
>> Additionally I've found one missing treatment of domain_name for
>> INP_NAME requests.
>>
>> We are working with Jakub on tracking down what's wrong on SSSD side.
>
>Indeed, there was a casing issue in sysdb. You can continue testing with
>lowercase user names in the meantime. A patch is already on the SSSD
>list.
In addition, we need to disqualify user name when returning back a
packet from extdom operation as this is what SSSD expects. 

Attached patch does it for all types of requests.

-- 
/ Alexander Bokovoy
-------------- next part --------------
>From 3659059c646f7b584ee07fb9e780759bcc0bb08e Mon Sep 17 00:00:00 2001
From: Alexander Bokovoy <abokovoy at redhat.com>
Date: Mon, 8 Jul 2013 19:19:56 +0300
Subject: [PATCH] Fix extdom plugin to provide unqualified name in response as
 sssd expects

extdom plugin handles external operation over which SSSD asks IPA server about
trusted domain users not found through normal paths but detected to belong
to the trusted domains associated with IPA realm.

SSSD expects that user or group name in the response will be unqualified
because domain name for the user or group is also included in the response.
Strip domain name from the name if getgrnam_r/getpwnam_r calls returned fully
qualified name which includes the domain name we are asked to handle.

The code already expects that fully-qualified names are following user at domain
convention so we are simply tracking whether '@' symbol is present and is followed
by the domain name.
---
 .../ipa-extdom-extop/ipa_extdom_common.c           | 26 ++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/daemons/ipa-slapi-plugins/ipa-extdom-extop/ipa_extdom_common.c b/daemons/ipa-slapi-plugins/ipa-extdom-extop/ipa_extdom_common.c
index 8aa22e1..290da4e 100644
--- a/daemons/ipa-slapi-plugins/ipa-extdom-extop/ipa_extdom_common.c
+++ b/daemons/ipa-slapi-plugins/ipa-extdom-extop/ipa_extdom_common.c
@@ -295,6 +295,7 @@ int handle_request(struct ipa_extdom_ctx *ctx, struct extdom_req *req,
                                  &grp_result);
             }
         }
+        domain_name = strdup(req->data.name.domain_name);
         break;
     default:
         ret = LDAP_PROTOCOL_ERROR;
@@ -338,6 +339,7 @@ int create_response(struct extdom_req *req, struct pwd_grp *pg_data,
                     const char *domain_name, struct extdom_res **_res)
 {
     int ret = EFAULT;
+    char *locat = NULL;
     struct extdom_res *res;
 
     res = calloc(1, sizeof(struct extdom_res));
@@ -354,10 +356,20 @@ int create_response(struct extdom_req *req, struct pwd_grp *pg_data,
                     switch(id_type) {
                     case SSS_ID_TYPE_UID:
                     case SSS_ID_TYPE_BOTH:
+                        if ((locat = strchr(pg_data->data.pwd.pw_name, '@')) != NULL) {
+                            if (strstr(locat, domain_name) != NULL ) {
+                                locat[0] = 0;
+                            }
+                        }
                         res->data.name.object_name =
                                               strdup(pg_data->data.pwd.pw_name);
                         break;
                     case SSS_ID_TYPE_GID:
+                        if ((locat = strchr(pg_data->data.grp.gr_name, '@')) != NULL) {
+                            if (strstr(locat, domain_name) != NULL) {
+                                locat[0] = 0;
+                            }
+                        }
                         res->data.name.object_name =
                                               strdup(pg_data->data.grp.gr_name);
                         break;
@@ -393,6 +405,11 @@ int create_response(struct extdom_req *req, struct pwd_grp *pg_data,
                 case SSS_ID_TYPE_BOTH:
                     res->response_type = RESP_USER;
                     res->data.user.domain_name = strdup(domain_name);
+                    if ((locat = strchr(pg_data->data.pwd.pw_name, '@')) != NULL) {
+                        if (strstr(locat, domain_name) != NULL) {
+                            locat[0] = 0;
+                        }
+                    }
                     res->data.user.user_name =
                                               strdup(pg_data->data.pwd.pw_name);
 
@@ -408,6 +425,11 @@ int create_response(struct extdom_req *req, struct pwd_grp *pg_data,
                 case SSS_ID_TYPE_GID:
                     res->response_type = RESP_GROUP;
                     res->data.group.domain_name = strdup(domain_name);
+                    if ((locat = strchr(pg_data->data.grp.gr_name, '@')) != NULL) {
+                        if (strstr(locat, domain_name) != NULL) {
+                            locat[0] = 0;
+                        }
+                    }
                     res->data.group.group_name =
                                               strdup(pg_data->data.grp.gr_name);
 
@@ -438,6 +460,10 @@ done:
         free_resp_data(res);
     }
 
+    if (locat != NULL) {
+        locat[0] = '@';
+    }
+
     return ret;
 }
 
-- 
1.8.3.1