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/*
Unix SMB/Netbios implementation.
Version 1.9.
uid/user handling
Copyright (C) Andrew Tridgell 1992-1998
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
extern int DEBUGLEVEL;
extern struct current_user current_user;
/****************************************************************************
Become the user of a connection number.
****************************************************************************/
BOOL become_user(connection_struct *conn, uint16 vuid)
{
vuser_key key;
key.pid = getpid();
key.vuid = vuid;
return become_userk(conn, &key);
}
/****************************************************************************
Become the user of a connection number.
****************************************************************************/
BOOL become_userk(connection_struct *conn, const vuser_key *key)
{
user_struct *vuser = NULL;
int snum;
gid_t gid = -1;
uid_t uid = -1;
char group_c;
int ngroups = 0;
gid_t *groups = NULL;
if (!conn)
{
DEBUG(2,("Connection not open\n"));
return(False);
}
/*
* We need a separate check in security=share mode due to vuid
* always being UID_FIELD_INVALID. If we don't do this then
* in share mode security we are *always* changing uid's between
* SMB's - this hurts performance - Badly.
*/
if((lp_security() == SEC_SHARE) && (current_user.conn == conn) &&
(current_user.uid == conn->uid))
{
DEBUG(4,("Skipping become_user - already user\n"));
return(True);
}
vuser = get_valid_user_struct(key);
if ((current_user.conn == conn) &&
(vuser != NULL) &&
(current_user.key.vuid == key->vuid) &&
(current_user.key.pid == key->pid) &&
(current_user.uid == vuser->uid))
{
DEBUG(4,("Skipping become_user - already user\n"));
vuid_free_user_struct(vuser);
safe_free(vuser);
return(True);
}
unbecome_user();
snum = SNUM(conn);
if((vuser != NULL) && !check_vuser_ok(&conn->uid_cache, vuser, snum))
{
vuid_free_user_struct(vuser);
safe_free(vuser);
return False;
}
if (conn->force_user ||
lp_security() == SEC_SHARE ||
!(vuser) || (vuser->guest)) {
uid = conn->uid;
gid = conn->gid;
groups = conn->groups;
ngroups = conn->ngroups;
} else {
if (!vuser) {
DEBUG(2,("Invalid vuid used %d\n",key->vuid));
return(False);
}
uid = vuser->uid;
gid = vuser->gid;
ngroups = vuser->n_groups;
groups = vuser->groups;
}
/*
* See if we should force group for this service.
* If so this overrides any group set in the force
* user code.
*/
if((group_c = *lp_force_group(snum))) {
if(group_c == '+') {
/*
* Only force group if the user is a member of
* the service group. Check the group memberships for
* this user (we already have this) to
* see if we should force the group.
*/
int i;
for (i = 0; i < current_user.ngroups; i++) {
if (current_user.groups[i] == conn->gid) {
gid = conn->gid;
break;
}
}
} else {
gid = conn->gid;
}
}
vuid_free_user_struct(vuser);
safe_free(vuser);
return become_unix_sec_ctx(key, conn, uid, gid, ngroups, groups);
}
/****************************************************************************
unbecome the user of a connection number
****************************************************************************/
BOOL unbecome_user(void )
{
if (!current_user.conn)
return(False);
return unbecome_to_initial_uid();
}
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