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/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Andrew Bartlett 2001
Copyright (C) Jeremy Allison 2000-2001
Copyright (C) Rafal Szczesniak 2002
Copyright (C) Volker Lendecke 2006
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/>.
*/
#include "includes.h"
#include "smbd/globals.h"
#include "../libcli/auth/libcli_auth.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/***************************************************************************
Is the incoming username our own machine account ?
If so, the connection is almost certainly from winbindd.
***************************************************************************/
static bool is_our_machine_account(const char *username)
{
bool ret;
char *truncname = NULL;
size_t ulen = strlen(username);
if (ulen == 0 || username[ulen-1] != '$') {
return false;
}
truncname = SMB_STRDUP(username);
if (!truncname) {
return false;
}
truncname[ulen-1] = '\0';
ret = strequal(truncname, global_myname());
SAFE_FREE(truncname);
return ret;
}
/***************************************************************************
Make (and fill) a user_info struct from a struct samu
***************************************************************************/
NTSTATUS make_server_info_sam(struct auth_serversupplied_info **server_info,
struct samu *sampass)
{
struct passwd *pwd;
gid_t *gids;
struct auth_serversupplied_info *result;
const char *username = pdb_get_username(sampass);
NTSTATUS status;
if ( !(result = make_server_info(NULL)) ) {
return NT_STATUS_NO_MEMORY;
}
if ( !(pwd = getpwnam_alloc(result, username)) ) {
DEBUG(1, ("User %s in passdb, but getpwnam() fails!\n",
pdb_get_username(sampass)));
TALLOC_FREE(result);
return NT_STATUS_NO_SUCH_USER;
}
status = samu_to_SamInfo3(result, sampass,
global_myname(), &result->info3);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(result);
return status;
}
result->unix_name = pwd->pw_name;
/* Ensure that we keep pwd->pw_name, because we will free pwd below */
talloc_steal(result, pwd->pw_name);
result->utok.gid = pwd->pw_gid;
result->utok.uid = pwd->pw_uid;
TALLOC_FREE(pwd);
result->sanitized_username = sanitize_username(result,
result->unix_name);
if (result->sanitized_username == NULL) {
TALLOC_FREE(result);
return NT_STATUS_NO_MEMORY;
}
if (IS_DC && is_our_machine_account(username)) {
/*
* Ensure for a connection from our own
* machine account (from winbindd on a DC)
* there are no supplementary groups.
* Prevents loops in calling gid_to_sid().
*/
result->sids = NULL;
gids = NULL;
result->num_sids = 0;
/*
* This is a hack of monstrous proportions.
* If we know it's winbindd talking to us,
* we know we must never recurse into it,
* so turn off contacting winbindd for this
* entire process. This will get fixed when
* winbindd doesn't need to talk to smbd on
* a PDC. JRA.
*/
(void)winbind_off();
DEBUG(10, ("make_server_info_sam: our machine account %s "
"setting supplementary group list empty and "
"turning off winbindd requests.\n",
username));
} else {
status = pdb_enum_group_memberships(result, sampass,
&result->sids, &gids,
&result->num_sids);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10, ("pdb_enum_group_memberships failed: %s\n",
nt_errstr(status)));
TALLOC_FREE(result);
return status;
}
}
/* For now we throw away the gids and convert via sid_to_gid
* later. This needs fixing, but I'd like to get the code straight and
* simple first. */
TALLOC_FREE(gids);
DEBUG(5,("make_server_info_sam: made server info for user %s -> %s\n",
pdb_get_username(sampass), result->unix_name));
*server_info = result;
return NT_STATUS_OK;
}
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