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/*
Unix SMB/CIFS implementation.
Password and authentication handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Jeremy Allison 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/>.
*/
#include "includes.h"
#include "system/passwd.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "../librpc/gen_ndr/netlogon.h"
#include "auth.h"
#include "../libcli/security/security.h"
enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
SERVER_ALLOCATED_REQUIRED_NO,
SERVER_ALLOCATED_REQUIRED_ANY};
static struct user_struct *get_valid_user_struct_internal(
struct smbd_server_connection *sconn,
uint64_t vuid,
enum server_allocated_state server_allocated)
{
struct user_struct *usp;
int count=0;
if (vuid == UID_FIELD_INVALID)
return NULL;
usp=sconn->users;
for (;usp;usp=usp->next,count++) {
if (vuid == usp->vuid) {
switch (server_allocated) {
case SERVER_ALLOCATED_REQUIRED_YES:
if (usp->session_info == NULL) {
continue;
}
break;
case SERVER_ALLOCATED_REQUIRED_NO:
if (usp->session_info != NULL) {
continue;
}
case SERVER_ALLOCATED_REQUIRED_ANY:
break;
}
if (count > 10) {
DLIST_PROMOTE(sconn->users, usp);
}
return usp;
}
}
return NULL;
}
/****************************************************************************
Check if a uid has been validated, and return an pointer to the user_struct
if it has. NULL if not. vuid is biased by an offset. This allows us to
tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/
struct user_struct *get_valid_user_struct(struct smbd_server_connection *sconn,
uint64_t vuid)
{
return get_valid_user_struct_internal(sconn, vuid,
SERVER_ALLOCATED_REQUIRED_YES);
}
/****************************************************************************
Invalidate a uid.
****************************************************************************/
void invalidate_vuid(struct smbd_server_connection *sconn, uint64_t vuid)
{
struct user_struct *vuser = NULL;
vuser = get_valid_user_struct_internal(sconn, vuid,
SERVER_ALLOCATED_REQUIRED_ANY);
if (vuser == NULL) {
return;
}
session_yield(vuser->session);
DLIST_REMOVE(sconn->users, vuser);
SMB_ASSERT(sconn->num_users > 0);
sconn->num_users--;
/* clear the vuid from the 'cache' on each connection, and
from the vuid 'owner' of connections */
conn_clear_vuid_caches(sconn, vuid);
TALLOC_FREE(vuser);
}
int register_homes_share(const char *username)
{
int result;
struct passwd *pwd;
result = lp_servicenumber(username);
if (result != -1) {
DEBUG(3, ("Using static (or previously created) service for "
"user '%s'; path = '%s'\n", username,
lp_path(talloc_tos(), result)));
return result;
}
pwd = Get_Pwnam_alloc(talloc_tos(), username);
if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
DEBUG(3, ("No home directory defined for user '%s'\n",
username));
TALLOC_FREE(pwd);
return -1;
}
if (strequal(pwd->pw_dir, "/")) {
DBG_NOTICE("Invalid home directory defined for user '%s'\n",
username);
TALLOC_FREE(pwd);
return -1;
}
DEBUG(3, ("Adding homes service for user '%s' using home directory: "
"'%s'\n", username, pwd->pw_dir));
result = add_home_service(username, username, pwd->pw_dir);
TALLOC_FREE(pwd);
return result;
}
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