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/*
Unix SMB/Netbios implementation.
Version 3.0
handle GENSEC authentication, server side
Copyright (C) Andrew Tridgell 2001
Copyright (C) Andrew Bartlett 2001-2003,2011
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 "../lib/tsocket/tsocket.h"
#include "auth/gensec/gensec.h"
#include "lib/param/param.h"
#ifdef HAVE_KRB5
#include "libcli/auth/krb5_wrap.h"
#endif
#include "librpc/crypto/gse.h"
#include "auth/credentials/credentials.h"
static NTSTATUS auth3_generate_session_info_pac(struct auth4_context *auth_ctx,
TALLOC_CTX *mem_ctx,
struct smb_krb5_context *smb_krb5_context,
DATA_BLOB *pac_blob,
const char *princ_name,
const struct tsocket_address *remote_address,
uint32_t session_info_flags,
struct auth_session_info **session_info)
{
TALLOC_CTX *tmp_ctx;
struct PAC_DATA *pac_data = NULL;
struct PAC_LOGON_INFO *logon_info = NULL;
unsigned int i;
bool is_mapped;
bool is_guest;
char *ntuser;
char *ntdomain;
char *username;
char *rhost;
struct passwd *pw;
NTSTATUS status;
int rc;
tmp_ctx = talloc_new(mem_ctx);
if (!tmp_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (pac_blob) {
#ifdef HAVE_KRB5
status = kerberos_decode_pac(tmp_ctx,
*pac_blob,
NULL, NULL, NULL, NULL, 0, &pac_data);
#else
status = NT_STATUS_ACCESS_DENIED;
#endif
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
/* get logon name and logon info */
for (i = 0; i < pac_data->num_buffers; i++) {
struct PAC_BUFFER *data_buf = &pac_data->buffers[i];
switch (data_buf->type) {
case PAC_TYPE_LOGON_INFO:
if (!data_buf->info) {
break;
}
logon_info = data_buf->info->logon_info.info;
break;
default:
break;
}
}
if (!logon_info) {
DEBUG(1, ("Invalid PAC data, missing logon info!\n"));
status = NT_STATUS_NOT_FOUND;
goto done;
}
}
rc = get_remote_hostname(remote_address,
&rhost,
tmp_ctx);
if (rc < 0) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
if (strequal(rhost, "UNKNOWN")) {
rhost = tsocket_address_inet_addr_string(remote_address,
tmp_ctx);
if (rhost == NULL) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
}
status = get_user_from_kerberos_info(tmp_ctx, rhost,
princ_name, logon_info,
&is_mapped, &is_guest,
&ntuser, &ntdomain,
&username, &pw);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to map kerberos principal to system user "
"(%s)\n", nt_errstr(status)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
/* save the PAC data if we have it */
if (logon_info) {
netsamlogon_cache_store(ntuser, &logon_info->info3);
}
/* setup the string used by %U */
sub_set_smb_name(username);
/* reload services so that the new %U is taken into account */
lp_load(get_dyn_CONFIGFILE(), false, false, true, true);
status = make_session_info_krb5(mem_ctx,
ntuser, ntdomain, username, pw,
logon_info, is_guest, is_mapped, NULL /* No session key for now, caller will sort it out */,
session_info);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
nt_errstr(status)));
status = NT_STATUS_ACCESS_DENIED;
goto done;
}
DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
ntuser, ntdomain, rhost));
status = NT_STATUS_OK;
done:
TALLOC_FREE(tmp_ctx);
return status;
}
NTSTATUS auth_generic_prepare(TALLOC_CTX *mem_ctx,
const struct tsocket_address *remote_address,
struct gensec_security **gensec_security_out)
{
struct gensec_security *gensec_security;
struct auth_context *auth_context;
NTSTATUS nt_status;
TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
nt_status = make_auth_context_subsystem(tmp_ctx, &auth_context);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
if (auth_context->prepare_gensec) {
nt_status = auth_context->prepare_gensec(tmp_ctx,
&gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
} else {
struct gensec_settings *gensec_settings;
struct loadparm_context *lp_ctx;
struct cli_credentials *server_credentials;
struct auth4_context *auth4_context = talloc_zero(tmp_ctx, struct auth4_context);
if (auth4_context == NULL) {
DEBUG(10, ("failed to allocate auth4_context failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
auth4_context->generate_session_info_pac = auth3_generate_session_info_pac;
lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_context());
if (lp_ctx == NULL) {
DEBUG(10, ("loadparm_init_s3 failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_INVALID_SERVER_STATE;
}
gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
if (lp_ctx == NULL) {
DEBUG(10, ("lpcfg_gensec_settings failed\n"));
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
gensec_settings->backends = talloc_zero_array(gensec_settings, struct gensec_security_ops *, 3);
if (gensec_settings->backends == NULL) {
TALLOC_FREE(tmp_ctx);
return NT_STATUS_NO_MEMORY;
}
gensec_settings->backends[0] = &gensec_ntlmssp3_server_ops;
#if defined(HAVE_KRB5) && defined(HAVE_GSS_WRAP_IOV)
gensec_settings->backends[1] = &gensec_gse_krb5_security_ops;
#endif
/*
* This is anonymous for now, because we just use it
* to set the kerberos state at the moment
*/
server_credentials = cli_credentials_init_anon(tmp_ctx);
if (!server_credentials) {
DEBUG(0, ("auth_generic_prepare: Failed to init server credentials\n"));
return NT_STATUS_NO_MEMORY;
}
cli_credentials_set_conf(server_credentials, lp_ctx);
if (lp_security() == SEC_ADS || USE_KERBEROS_KEYTAB) {
cli_credentials_set_kerberos_state(server_credentials, CRED_AUTO_USE_KERBEROS);
} else {
cli_credentials_set_kerberos_state(server_credentials, CRED_DONT_USE_KERBEROS);
}
nt_status = gensec_server_start(tmp_ctx, gensec_settings,
auth4_context, &gensec_security);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
gensec_set_credentials(gensec_security, server_credentials);
talloc_unlink(tmp_ctx, lp_ctx);
talloc_unlink(tmp_ctx, server_credentials);
talloc_unlink(tmp_ctx, gensec_settings);
talloc_unlink(tmp_ctx, auth4_context);
}
nt_status = gensec_set_remote_address(gensec_security,
remote_address);
if (!NT_STATUS_IS_OK(nt_status)) {
TALLOC_FREE(tmp_ctx);
return nt_status;
}
*gensec_security_out = talloc_steal(mem_ctx, gensec_security);
TALLOC_FREE(tmp_ctx);
return NT_STATUS_OK;
}
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