source: vendor/3.6.24/source4/libnet/groupinfo.c

/* 
   Unix SMB/CIFS implementation.

   Copyright (C) Rafal Szczesniak 2007
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

/*
  a composite function for getting group information via samr pipe
*/


#include "includes.h"
#include "libcli/composite/composite.h"
#include "librpc/gen_ndr/security.h"
#include "libcli/security/security.h"
#include "libnet/libnet.h"
#include "librpc/gen_ndr/ndr_samr_c.h"


struct groupinfo_state {
        struct dcerpc_pipe         *pipe;
        struct policy_handle       domain_handle;
        struct policy_handle       group_handle;
        uint16_t                   level;
        struct samr_LookupNames    lookup;
        struct samr_OpenGroup      opengroup;
        struct samr_QueryGroupInfo querygroupinfo;
        struct samr_Close          samrclose;
        union  samr_GroupInfo      *info;

        /* information about the progress */
        void (*monitor_fn)(struct monitor_msg *);
};


static void continue_groupinfo_lookup(struct tevent_req *subreq);
static void continue_groupinfo_opengroup(struct tevent_req *subreq);
static void continue_groupinfo_getgroup(struct tevent_req *subreq);
static void continue_groupinfo_closegroup(struct tevent_req *subreq);


/**
 * Stage 1 (optional): Look for a group name in SAM server.
 */
static void continue_groupinfo_lookup(struct tevent_req *subreq)
{
        struct composite_context *c;
        struct groupinfo_state *s;
        struct monitor_msg msg;
        struct msg_rpc_lookup_name *msg_lookup;

        c = tevent_req_callback_data(subreq, struct composite_context);
        s = talloc_get_type(c->private_data, struct groupinfo_state);

        /* receive samr_Lookup reply */
        c->status = dcerpc_samr_LookupNames_r_recv(subreq, s);
        TALLOC_FREE(subreq);
        if (!composite_is_ok(c)) return;
        
        /* there could be a problem with name resolving itself */
        if (!NT_STATUS_IS_OK(s->lookup.out.result)) {
                composite_error(c, s->lookup.out.result);
                return;
        }

        /* issue a monitor message */
        if (s->monitor_fn) {
                msg.type = mon_SamrLookupName;
                msg_lookup = talloc(s, struct msg_rpc_lookup_name);
                msg_lookup->rid = s->lookup.out.rids->ids;
                msg_lookup->count = s->lookup.out.rids->count;
                msg.data = (void*)msg_lookup;
                msg.data_size = sizeof(*msg_lookup);
                
                s->monitor_fn(&msg);
        }

        /* have we actually got name resolved
           - we're looking for only one at the moment */
        if (s->lookup.out.rids->count != s->lookup.in.num_names) {
                composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
                return;
        }
        if (s->lookup.out.types->count != s->lookup.in.num_names) {
                composite_error(c, NT_STATUS_INVALID_NETWORK_RESPONSE);
                return;
        }

        /* TODO: find proper status code for more than one rid found */

        /* prepare parameters for LookupNames */
        s->opengroup.in.domain_handle   = &s->domain_handle;
        s->opengroup.in.access_mask     = SEC_FLAG_MAXIMUM_ALLOWED;
        s->opengroup.in.rid             = s->lookup.out.rids->ids[0];
        s->opengroup.out.group_handle   = &s->group_handle;

        /* send request */
        subreq = dcerpc_samr_OpenGroup_r_send(s, c->event_ctx,
                                              s->pipe->binding_handle,
                                              &s->opengroup);
        if (composite_nomem(subreq, c)) return;

        tevent_req_set_callback(subreq, continue_groupinfo_opengroup, c);
}


/**
 * Stage 2: Open group policy handle.
 */
static void continue_groupinfo_opengroup(struct tevent_req *subreq)
{
        struct composite_context *c;
        struct groupinfo_state *s;
        struct monitor_msg msg;
        struct msg_rpc_open_group *msg_open;

        c = tevent_req_callback_data(subreq, struct composite_context);
        s = talloc_get_type(c->private_data, struct groupinfo_state);

        /* receive samr_OpenGroup reply */
        c->status = dcerpc_samr_OpenGroup_r_recv(subreq, s);
        TALLOC_FREE(subreq);
        if (!composite_is_ok(c)) return;

        if (!NT_STATUS_IS_OK(s->querygroupinfo.out.result)) {
                composite_error(c, s->querygroupinfo.out.result);
                return;
        }

        /* issue a monitor message */
        if (s->monitor_fn) {
                msg.type = mon_SamrOpenGroup;
                msg_open = talloc(s, struct msg_rpc_open_group);
                msg_open->rid = s->opengroup.in.rid;
                msg_open->access_mask = s->opengroup.in.access_mask;
                msg.data = (void*)msg_open;
                msg.data_size = sizeof(*msg_open);
                
                s->monitor_fn(&msg);
        }
        
        /* prepare parameters for QueryGroupInfo call */
        s->querygroupinfo.in.group_handle = &s->group_handle;
        s->querygroupinfo.in.level        = s->level;
        s->querygroupinfo.out.info        = talloc(s, union samr_GroupInfo *);
        if (composite_nomem(s->querygroupinfo.out.info, c)) return;
        
        /* queue rpc call, set event handling and new state */
        subreq = dcerpc_samr_QueryGroupInfo_r_send(s,
                                                   c->event_ctx,
                                                   s->pipe->binding_handle,
                                                   &s->querygroupinfo);
        if (composite_nomem(subreq, c)) return;
        
        tevent_req_set_callback(subreq, continue_groupinfo_getgroup, c);
}


/**
 * Stage 3: Get requested group information.
 */
static void continue_groupinfo_getgroup(struct tevent_req *subreq)
{
        struct composite_context *c;
        struct groupinfo_state *s;
        struct monitor_msg msg;
        struct msg_rpc_query_group *msg_query;

        c = tevent_req_callback_data(subreq, struct composite_context);
        s = talloc_get_type(c->private_data, struct groupinfo_state);

        /* receive samr_QueryGroupInfo reply */
        c->status = dcerpc_samr_QueryGroupInfo_r_recv(subreq, s);
        TALLOC_FREE(subreq);
        if (!composite_is_ok(c)) return;

        /* check if querygroup itself went ok */
        if (!NT_STATUS_IS_OK(s->querygroupinfo.out.result)) {
                composite_error(c, s->querygroupinfo.out.result);
                return;
        }

        s->info = talloc_steal(s, *s->querygroupinfo.out.info);

        /* issue a monitor message */
        if (s->monitor_fn) {
                msg.type = mon_SamrQueryGroup;
                msg_query = talloc(s, struct msg_rpc_query_group);
                msg_query->level = s->querygroupinfo.in.level;
                msg.data = (void*)msg_query;
                msg.data_size = sizeof(*msg_query);
                
                s->monitor_fn(&msg);
        }
        
        /* prepare arguments for Close call */
        s->samrclose.in.handle  = &s->group_handle;
        s->samrclose.out.handle = &s->group_handle;
        
        /* queue rpc call, set event handling and new state */
        subreq = dcerpc_samr_Close_r_send(s, c->event_ctx,
                                          s->pipe->binding_handle,
                                          &s->samrclose);
        if (composite_nomem(subreq, c)) return;
        
        tevent_req_set_callback(subreq, continue_groupinfo_closegroup, c);
}


/**
 * Stage 4: Close policy handle associated with opened group.
 */
static void continue_groupinfo_closegroup(struct tevent_req *subreq)
{
        struct composite_context *c;
        struct groupinfo_state *s;
        struct monitor_msg msg;
        struct msg_rpc_close_group *msg_close;

        c = tevent_req_callback_data(subreq, struct composite_context);
        s = talloc_get_type(c->private_data, struct groupinfo_state);

        /* receive samr_Close reply */
        c->status = dcerpc_samr_Close_r_recv(subreq, s);
        TALLOC_FREE(subreq);
        if (!composite_is_ok(c)) return;

        if (!NT_STATUS_IS_OK(s->samrclose.out.result)) {
                composite_error(c, s->samrclose.out.result);
                return;
        }

        /* issue a monitor message */
        if (s->monitor_fn) {
                msg.type = mon_SamrClose;
                msg_close = talloc(s, struct msg_rpc_close_group);
                msg_close->rid = s->opengroup.in.rid;
                msg.data = (void*)msg_close;
                msg.data_size = sizeof(*msg_close);

                s->monitor_fn(&msg);
        }

        composite_done(c);
}


/**
 * Sends asynchronous groupinfo request
 *
 * @param p dce/rpc call pipe 
 * @param io arguments and results of the call
 */
struct composite_context *libnet_rpc_groupinfo_send(struct dcerpc_pipe *p,
                                                    struct libnet_rpc_groupinfo *io,
                                                    void (*monitor)(struct monitor_msg*))
{
        struct composite_context *c;
        struct groupinfo_state *s;
        struct dom_sid *sid;
        struct tevent_req *subreq;

        if (!p || !io) return NULL;
        
        c = composite_create(p, dcerpc_event_context(p));
        if (c == NULL) return c;
        
        s = talloc_zero(c, struct groupinfo_state);
        if (composite_nomem(s, c)) return c;

        c->private_data = s;

        s->level         = io->in.level;
        s->pipe          = p;
        s->domain_handle = io->in.domain_handle;
        s->monitor_fn    = monitor;

        if (io->in.sid) {
                sid = dom_sid_parse_talloc(s, io->in.sid);
                if (composite_nomem(sid, c)) return c;

                s->opengroup.in.domain_handle  = &s->domain_handle;
                s->opengroup.in.access_mask    = SEC_FLAG_MAXIMUM_ALLOWED;
                s->opengroup.in.rid            = sid->sub_auths[sid->num_auths - 1];
                s->opengroup.out.group_handle  = &s->group_handle;
                
                /* send request */
                subreq = dcerpc_samr_OpenGroup_r_send(s, c->event_ctx,
                                                      p->binding_handle,
                                                      &s->opengroup);
                if (composite_nomem(subreq, c)) return c;

                tevent_req_set_callback(subreq, continue_groupinfo_opengroup, c);

        } else {
                /* preparing parameters to send rpc request */
                s->lookup.in.domain_handle    = &s->domain_handle;
                s->lookup.in.num_names        = 1;
                s->lookup.in.names            = talloc_array(s, struct lsa_String, 1);
                if (composite_nomem(s->lookup.in.names, c)) return c;

                s->lookup.in.names[0].string  = talloc_strdup(s, io->in.groupname);
                if (composite_nomem(s->lookup.in.names[0].string, c)) return c;
                s->lookup.out.rids         = talloc_zero(s, struct samr_Ids);
                s->lookup.out.types        = talloc_zero(s, struct samr_Ids);
                if (composite_nomem(s->lookup.out.rids, c)) return c;
                if (composite_nomem(s->lookup.out.types, c)) return c;

                /* send request */
                subreq = dcerpc_samr_LookupNames_r_send(s, c->event_ctx,
                                                        p->binding_handle,
                                                        &s->lookup);
                if (composite_nomem(subreq, c)) return c;
                
                tevent_req_set_callback(subreq, continue_groupinfo_lookup, c);
        }

        return c;
}


/**
 * Waits for and receives result of asynchronous groupinfo call
 * 
 * @param c composite context returned by asynchronous groupinfo call
 * @param mem_ctx memory context of the call
 * @param io pointer to results (and arguments) of the call
 * @return nt status code of execution
 */

NTSTATUS libnet_rpc_groupinfo_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
                                   struct libnet_rpc_groupinfo *io)
{
        NTSTATUS status;
        struct groupinfo_state *s;
        
        /* wait for results of sending request */
        status = composite_wait(c);
        
        if (NT_STATUS_IS_OK(status) && io) {
                s = talloc_get_type(c->private_data, struct groupinfo_state);
                talloc_steal(mem_ctx, s->info);
                io->out.info = *s->info;
        }
        
        /* memory context associated to composite context is no longer needed */
        talloc_free(c);
        return status;
}


/**
 * Synchronous version of groupinfo call
 *
 * @param pipe dce/rpc call pipe
 * @param mem_ctx memory context for the call
 * @param io arguments and results of the call
 * @return nt status code of execution
 */

NTSTATUS libnet_rpc_groupinfo(struct dcerpc_pipe *p,
                              TALLOC_CTX *mem_ctx,
                              struct libnet_rpc_groupinfo *io)
{
        struct composite_context *c = libnet_rpc_groupinfo_send(p, io, NULL);
        return libnet_rpc_groupinfo_recv(c, mem_ctx, io);
}