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/*
Unix SMB/CIFS implementation.
Password and authentication 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"
/****************************************************************************
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 smbsrv_session *smbsrv_session_find(struct smbsrv_connection *smb_conn, uint16_t vuid)
{
struct smbsrv_session *sess;
int count=0;
if (vuid == UID_FIELD_INVALID)
return NULL;
for (sess=smb_conn->sessions.session_list; sess; sess=sess->next,count++) {
if (vuid == sess->vuid) {
if (count > 10) {
DLIST_PROMOTE(smb_conn->sessions.session_list, sess);
}
return sess;
}
}
return NULL;
}
/****************************************************************************
invalidate a uid
****************************************************************************/
void smbsrv_invalidate_vuid(struct smbsrv_connection *smb_conn, uint16_t vuid)
{
struct smbsrv_session *sess = smbsrv_session_find(smb_conn, vuid);
if (sess == NULL)
return;
session_yield(sess);
DLIST_REMOVE(smb_conn->sessions.session_list, sess);
/* clear the vuid from the 'cache' on each connection, and
from the vuid 'owner' of connections */
/* REWRITE: conn_clear_vuid_cache(smb, vuid); */
smb_conn->sessions.num_validated_vuids--;
}
/****************************************************************************
invalidate all vuid entries for this process
****************************************************************************/
void smbsrv_invalidate_all_vuids(struct smbsrv_connection *smb_conn)
{
struct smbsrv_session *sess,*next=NULL;
for (sess=smb_conn->sessions.session_list; sess; sess=next) {
next = sess->next;
smbsrv_invalidate_vuid(smb_conn, sess->vuid);
}
}
/**
* register that a valid login has been performed, establish 'session'.
* @param session_info The token returned from the authentication process (if the authentication has completed)
* (now 'owned' by register_vuid)
*
* @param smb_name The untranslated name of the user
*
* @return Newly allocated vuid, biased by an offset. (This allows us to
* tell random client vuid's (normally zero) from valid vuids.)
*
*/
uint16_t smbsrv_register_session(struct smbsrv_connection *smb_conn,
struct auth_session_info *session_info,
struct gensec_security *gensec_ctx)
{
struct smbsrv_session *sess = NULL;
sess = talloc_p(smb_conn, struct smbsrv_session);
if(sess == NULL) {
DEBUG(0,("talloc_p(smb_conn->mem_ctx, struct smbsrv_session) failed\n"));
return UID_FIELD_INVALID;
}
ZERO_STRUCTP(sess);
sess->vuid = UID_FIELD_INVALID;
/* Ensure no vuid gets registered in share level security. */
/* TODO: replace lp_security with a flag in smbsrv_connection */
if(lp_security() == SEC_SHARE)
return sess->vuid;
/* Limit allowed vuids to 16bits - VUID_OFFSET. */
if (smb_conn->sessions.num_validated_vuids >= 0xFFFF-VUID_OFFSET)
return sess->vuid;
/* Allocate a free vuid. Yes this is a linear search... :-) */
while (smbsrv_session_find(smb_conn, smb_conn->sessions.next_vuid) != NULL ) {
smb_conn->sessions.next_vuid++;
/* Check for vuid wrap. */
if (smb_conn->sessions.next_vuid == UID_FIELD_INVALID)
smb_conn->sessions.next_vuid = VUID_OFFSET;
}
DEBUG(10,("register_vuid: allocated vuid = %u\n",
(uint_t)smb_conn->sessions.next_vuid));
sess->vuid = smb_conn->sessions.next_vuid;
smb_conn->sessions.next_vuid++;
smb_conn->sessions.num_validated_vuids++;
/* use this to keep tabs on all our info from the authentication */
if (session_info) {
sess->session_info = talloc_reference(sess, session_info);
}
if (gensec_ctx) {
sess->gensec_ctx = talloc_reference(sess, gensec_ctx);
}
sess->smb_conn = smb_conn;
DLIST_ADD(smb_conn->sessions.session_list, sess);
/* we only need to do session_claim() when the session_setup is complete
* for spnego session_info is NULL the first time
*/
if (session_info && !session_claim(sess)) {
DEBUG(1,("Failed to claim session for vuid=%d\n", sess->vuid));
smbsrv_invalidate_vuid(smb_conn, sess->vuid);
return UID_FIELD_INVALID;
}
return sess->vuid;
}
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