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/*
Unix SMB/Netbios implementation.
Version 1.9.
Main SMB reply routines
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"
/****************************************************************************
Read the a hosts.equiv or .rhosts file and check if it
allows this user from this machine.
****************************************************************************/
static BOOL check_user_equiv(const char *user, const char *remote, const char *equiv_file)
{
int plus_allowed = 1;
char *file_host;
char *file_user;
char **lines = file_lines_load(equiv_file, NULL);
int i;
DEBUG(5, ("check_user_equiv %s %s %s\n", user, remote, equiv_file));
if (! lines) return False;
for (i=0; lines[i]; i++) {
char *buf = lines[i];
trim_string(buf," "," ");
if (buf[0] != '#' && buf[0] != '\n')
{
BOOL is_group = False;
int plus = 1;
char *bp = buf;
if (strcmp(buf, "NO_PLUS\n") == 0)
{
DEBUG(6, ("check_user_equiv NO_PLUS\n"));
plus_allowed = 0;
}
else {
if (buf[0] == '+')
{
bp++;
if (*bp == '\n' && plus_allowed)
{
/* a bare plus means everbody allowed */
DEBUG(6, ("check_user_equiv everybody allowed\n"));
file_lines_free(lines);
return True;
}
}
else if (buf[0] == '-')
{
bp++;
plus = 0;
}
if (*bp == '@')
{
is_group = True;
bp++;
}
file_host = strtok(bp, " \t\n");
file_user = strtok(NULL, " \t\n");
DEBUG(7, ("check_user_equiv %s %s\n", file_host ? file_host : "(null)",
file_user ? file_user : "(null)" ));
if (file_host && *file_host)
{
BOOL host_ok = False;
#if defined(HAVE_NETGROUP) && defined(HAVE_YP_GET_DEFAULT_DOMAIN)
if (is_group)
{
static char *mydomain = NULL;
if (!mydomain)
yp_get_default_domain(&mydomain);
if (mydomain && innetgr(file_host,remote,user,mydomain))
host_ok = True;
}
#else
if (is_group)
{
DEBUG(1,("Netgroups not configured\n"));
continue;
}
#endif
/* is it this host */
/* the fact that remote has come from a call of gethostbyaddr
* means that it may have the fully qualified domain name
* so we could look up the file version to get it into
* a canonical form, but I would rather just type it
* in full in the equiv file
*/
if (!host_ok && !is_group && strequal(remote, file_host))
host_ok = True;
if (!host_ok)
continue;
/* is it this user */
if (file_user == 0 || strequal(user, file_user))
{
DEBUG(5, ("check_user_equiv matched %s%s %s\n",
(plus ? "+" : "-"), file_host,
(file_user ? file_user : "")));
file_lines_free(lines);
return (plus ? True : False);
}
}
}
}
}
file_lines_free(lines);
return False;
}
/****************************************************************************
check for a possible hosts equiv or rhosts entry for the user
****************************************************************************/
static BOOL check_hosts_equiv(struct passwd *pass)
{
char *fname = NULL;
if (!pass)
return(False);
fname = lp_hosts_equiv();
/* note: don't allow hosts.equiv on root */
if (fname && *fname && (pass->pw_uid != 0)) {
if (check_user_equiv(pass->pw_name,client_name(),fname))
return(True);
}
return(False);
}
/****************************************************************************
Check for a valid .rhosts/hosts.equiv entry for this user
****************************************************************************/
static NTSTATUS check_hostsequiv_security(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const auth_usersupplied_info *user_info,
auth_serversupplied_info **server_info)
{
NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
struct passwd *pass = Get_Pwnam(user_info->internal_username.str);
if (pass) {
if (check_hosts_equiv(pass)) {
nt_status = NT_STATUS_OK;
make_server_info_pw(server_info, pass);
}
} else {
nt_status = NT_STATUS_NO_SUCH_USER;
}
return nt_status;
}
/* module initialisation */
BOOL auth_init_hostsequiv(struct auth_context *auth_context, auth_methods **auth_method)
{
if (!make_auth_methods(auth_context, auth_method)) {
return False;
}
(*auth_method)->auth = check_hostsequiv_security;
return True;
}
/****************************************************************************
Check for a valid .rhosts/hosts.equiv entry for this user
****************************************************************************/
static NTSTATUS check_rhosts_security(const struct auth_context *auth_context,
void *my_private_data,
TALLOC_CTX *mem_ctx,
const auth_usersupplied_info *user_info,
auth_serversupplied_info **server_info)
{
NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE;
struct passwd *pass = Get_Pwnam(user_info->internal_username.str);
pstring rhostsfile;
if (pass) {
char *home = pass->pw_dir;
if (home) {
slprintf(rhostsfile, sizeof(rhostsfile)-1, "%s/.rhosts", home);
become_root();
if (check_user_equiv(pass->pw_name,client_name(),rhostsfile)) {
nt_status = NT_STATUS_OK;
make_server_info_pw(server_info, pass);
}
unbecome_root();
}
} else {
nt_status = NT_STATUS_NO_SUCH_USER;
}
return nt_status;
}
/* module initialisation */
BOOL auth_init_rhosts(struct auth_context *auth_context, auth_methods **auth_method)
{
if (!make_auth_methods(auth_context, auth_method)) {
return False;
}
(*auth_method)->auth = check_rhosts_security;
return True;
}
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