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/*
Unix SMB/CIFS implementation.
Authentication utility functions
Copyright (C) Simo Sorce 2010
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 "auth.h"
#include "librpc/gen_ndr/krb5pac.h"
#include "nsswitch/libwbclient/wbclient.h"
#include "passdb.h"
#include "lib/param/loadparm.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
#ifdef HAVE_KRB5
NTSTATUS get_user_from_kerberos_info(TALLOC_CTX *mem_ctx,
const char *cli_name,
const char *princ_name,
bool *is_mapped,
bool *mapped_to_guest,
char **ntuser,
char **ntdomain,
char **username,
struct passwd **_pw)
{
NTSTATUS status;
const char *domain = NULL;
const char *realm = NULL;
char *user = NULL;
char *p;
char *fuser = NULL;
char *unixuser = NULL;
struct passwd *pw = NULL;
bool may_retry = false;
DEBUG(3, ("Kerberos ticket principal name is [%s]\n", princ_name));
p = strchr_m(princ_name, '@');
if (!p) {
DEBUG(3, ("[%s] Doesn't look like a valid principal\n",
princ_name));
return NT_STATUS_LOGON_FAILURE;
}
user = talloc_strndup(mem_ctx, princ_name, p - princ_name);
if (!user) {
return NT_STATUS_NO_MEMORY;
}
realm = p + 1;
if (!strequal(realm, lp_realm())) {
DEBUG(3, ("Ticket for foreign realm %s@%s\n", user, realm));
if (!lp_allow_trusted_domains()) {
return NT_STATUS_LOGON_FAILURE;
}
domain = realm;
} else {
domain = lp_workgroup();
may_retry = true;
}
fuser = talloc_asprintf(mem_ctx,
"%s%c%s",
domain,
*lp_winbind_separator(),
user);
if (!fuser) {
return NT_STATUS_NO_MEMORY;
}
*is_mapped = map_username(mem_ctx, fuser, &fuser);
if (!fuser) {
return NT_STATUS_NO_MEMORY;
}
*mapped_to_guest = false;
pw = smb_getpwnam(mem_ctx, fuser, &unixuser, true);
if (may_retry && pw == NULL && !*is_mapped) {
fuser = talloc_strdup(mem_ctx, user);
if (!fuser) {
return NT_STATUS_NO_MEMORY;
}
pw = smb_getpwnam(mem_ctx, fuser, &unixuser, true);
}
if (pw) {
if (!unixuser) {
return NT_STATUS_NO_MEMORY;
}
/* if a real user check pam account restrictions */
/* only really performed if "obey pam restriction" is true */
/* do this before an eventual mapping to guest occurs */
status = smb_pam_accountcheck(pw->pw_name, cli_name);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("PAM account restrictions prevent user "
"[%s] login\n", unixuser));
return status;
}
}
if (!pw) {
/* this was originally the behavior of Samba 2.2, if a user
did not have a local uid but has been authenticated, then
map them to a guest account */
if (lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID) {
*mapped_to_guest = true;
fuser = talloc_strdup(mem_ctx, lp_guest_account());
if (!fuser) {
return NT_STATUS_NO_MEMORY;
}
pw = smb_getpwnam(mem_ctx, fuser, &unixuser, false);
}
/* extra sanity check that the guest account is valid */
if (!pw) {
DBG_NOTICE("Username %s is invalid on this system\n",
fuser);
return NT_STATUS_LOGON_FAILURE;
}
}
if (!unixuser) {
return NT_STATUS_NO_MEMORY;
}
*username = talloc_strdup(mem_ctx, unixuser);
if (!*username) {
return NT_STATUS_NO_MEMORY;
}
*ntuser = user;
*ntdomain = talloc_strdup(mem_ctx, domain);
if (*ntdomain == NULL) {
return NT_STATUS_NO_MEMORY;
}
*_pw = pw;
return NT_STATUS_OK;
}
NTSTATUS make_session_info_krb5(TALLOC_CTX *mem_ctx,
char *ntuser,
char *ntdomain,
char *username,
struct passwd *pw,
bool mapped_to_guest, bool username_was_mapped,
struct auth_session_info **session_info)
{
NTSTATUS status;
struct auth_serversupplied_info *server_info;
if (mapped_to_guest) {
status = make_server_info_guest(mem_ctx, &server_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("make_server_info_guest failed: %s!\n",
nt_errstr(status)));
return status;
}
} else {
/*
* We didn't get a PAC, we have to make up the user
* ourselves. Try to ask the pdb backend to provide
* SID consistency with ntlmssp session setup
*/
struct samu *sampass;
sampass = samu_new(talloc_tos());
if (sampass == NULL) {
return NT_STATUS_NO_MEMORY;
}
if (pdb_getsampwnam(sampass, username)) {
DEBUG(10, ("found user %s in passdb, calling "
"make_server_info_sam\n", username));
status = make_server_info_sam(mem_ctx,
sampass,
&server_info);
} else {
/*
* User not in passdb, make it up artificially
*/
DEBUG(10, ("didn't find user %s in passdb, calling "
"make_server_info_pw\n", username));
status = make_server_info_pw(mem_ctx,
username,
pw,
&server_info);
}
TALLOC_FREE(sampass);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("make_server_info_[sam|pw] failed: %s!\n",
nt_errstr(status)));
return status;
}
/* make_server_info_pw does not set the domain. Without this
* we end up with the local netbios name in substitutions for
* %D. */
if (server_info->info3 != NULL) {
server_info->info3->base.logon_domain.string =
talloc_strdup(server_info->info3, ntdomain);
}
}
server_info->nss_token |= username_was_mapped;
status = create_local_token(mem_ctx, server_info, NULL, ntuser, session_info);
talloc_free(server_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(10,("failed to create local token: %s\n",
nt_errstr(status)));
return status;
}
return NT_STATUS_OK;
}
#else /* HAVE_KRB5 */
NTSTATUS get_user_from_kerberos_info(TALLOC_CTX *mem_ctx,
const char *cli_name,
const char *princ_name,
bool *is_mapped,
bool *mapped_to_guest,
char **ntuser,
char **ntdomain,
char **username,
struct passwd **_pw)
{
return NT_STATUS_NOT_IMPLEMENTED;
}
NTSTATUS make_session_info_krb5(TALLOC_CTX *mem_ctx,
char *ntuser,
char *ntdomain,
char *username,
struct passwd *pw,
bool mapped_to_guest, bool username_was_mapped,
struct auth_session_info **session_info)
{
return NT_STATUS_NOT_IMPLEMENTED;
}
#endif /* HAVE_KRB5 */
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