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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 user_struct *get_valid_user_struct(struct server_context *smb, uint16 vuid)
{
user_struct *usp;
int count=0;
if (vuid == UID_FIELD_INVALID)
return NULL;
for (usp=smb->users.validated_users;usp;usp=usp->next,count++) {
if (vuid == usp->vuid) {
if (count > 10) {
DLIST_PROMOTE(smb->users.validated_users, usp);
}
return usp;
}
}
return NULL;
}
/****************************************************************************
invalidate a uid
****************************************************************************/
void invalidate_vuid(struct server_context *smb, uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(smb, vuid);
if (vuser == NULL)
return;
data_blob_free(&vuser->session_key);
session_yield(vuser);
free_server_info(&vuser->server_info);
DLIST_REMOVE(smb->users.validated_users, vuser);
/* clear the vuid from the 'cache' on each connection, and
from the vuid 'owner' of connections */
/* REWRITE: conn_clear_vuid_cache(smb, vuid); */
SAFE_FREE(vuser);
smb->users.num_validated_vuids--;
}
/****************************************************************************
invalidate all vuid entries for this process
****************************************************************************/
void invalidate_all_vuids(struct server_context *smb)
{
user_struct *usp, *next=NULL;
for (usp=smb->users.validated_users;usp;usp=next) {
next = usp->next;
invalidate_vuid(smb, usp->vuid);
}
}
/**
* register that a valid login has been performed, establish 'session'.
* @param server_info The token returned from the authentication process.
* (now 'owned' by register_vuid)
*
* @param session_key The User session key for the login session (now also '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.)
*
*/
int register_vuid(struct server_context *smb,
struct auth_serversupplied_info *server_info,
DATA_BLOB *session_key,
const char *smb_name)
{
user_struct *vuser = NULL;
/* Ensure no vuid gets registered in share level security. */
if(lp_security() == SEC_SHARE)
return UID_FIELD_INVALID;
/* Limit allowed vuids to 16bits - VUID_OFFSET. */
if (smb->users.num_validated_vuids >= 0xFFFF-VUID_OFFSET)
return UID_FIELD_INVALID;
if((vuser = (user_struct *)malloc( sizeof(user_struct) )) == NULL) {
DEBUG(0,("Failed to malloc users struct!\n"));
return UID_FIELD_INVALID;
}
ZERO_STRUCTP(vuser);
/* Allocate a free vuid. Yes this is a linear search... :-) */
while (get_valid_user_struct(smb, smb->users.next_vuid) != NULL ) {
smb->users.next_vuid++;
/* Check for vuid wrap. */
if (smb->users.next_vuid == UID_FIELD_INVALID)
smb->users.next_vuid = VUID_OFFSET;
}
DEBUG(10,("register_vuid: allocated vuid = %u\n",
(unsigned int)smb->users.next_vuid));
vuser->vuid = smb->users.next_vuid;
vuser->session_key = *session_key;
if (!server_info->ptok) {
DEBUG(1, ("server_info does not contain a user_token - cannot continue\n"));
free_server_info(&server_info);
SAFE_FREE(vuser);
return UID_FIELD_INVALID;
}
/* use this to keep tabs on all our info from the authentication */
vuser->server_info = server_info;
smb->users.next_vuid++;
smb->users.num_validated_vuids++;
DLIST_ADD(smb->users.validated_users, vuser);
if (!session_claim(smb, vuser)) {
DEBUG(1,("Failed to claim session for vuid=%d\n", vuser->vuid));
invalidate_vuid(smb, vuser->vuid);
return -1;
}
return vuser->vuid;
}
/****************************************************************************
add a name to the session users list
****************************************************************************/
void add_session_user(struct server_context *smb, const char *user)
{
char *suser;
struct passwd *passwd;
if (!(passwd = Get_Pwnam(user))) return;
suser = strdup(passwd->pw_name);
if (!suser) {
return;
}
if (suser && *suser && !in_list(suser,smb->users.session_users,False)) {
char *p;
if (!smb->users.session_users) {
asprintf(&p, "%s", suser);
} else {
asprintf(&p, "%s %s", smb->users.session_users, suser);
}
SAFE_FREE(smb->users.session_users);
smb->users.session_users = p;
}
free(suser);
}
/****************************************************************************
check if a username is valid
****************************************************************************/
BOOL user_ok(const char *user,int snum, gid_t *groups, size_t n_groups)
{
char **valid, **invalid;
BOOL ret;
valid = invalid = NULL;
ret = True;
if (lp_invalid_users(snum)) {
str_list_copy(&invalid, lp_invalid_users(snum));
if (invalid && str_list_substitute(invalid, "%S", lp_servicename(snum))) {
ret = !user_in_list(user, (const char **)invalid, groups, n_groups);
}
}
if (invalid)
str_list_free (&invalid);
if (ret && lp_valid_users(snum)) {
str_list_copy(&valid, lp_valid_users(snum));
if (valid && str_list_substitute(valid, "%S", lp_servicename(snum))) {
ret = user_in_list(user, (const char **)valid, groups, n_groups);
}
}
if (valid)
str_list_free (&valid);
if (ret && lp_onlyuser(snum)) {
char **user_list = str_list_make (lp_username(snum), NULL);
if (user_list && str_list_substitute(user_list, "%S", lp_servicename(snum))) {
ret = user_in_list(user, (const char **)user_list, groups, n_groups);
}
if (user_list) str_list_free (&user_list);
}
return(ret);
}
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