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https://github.com/samba-team/samba.git
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e8264d9678
Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Andreas Schneider <asn@samba.org>
492 lines
13 KiB
C
492 lines
13 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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handle GENSEC authentication, server side
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Andrew Bartlett 2001-2003,2011
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Copyright (C) Simo Sorce 2010.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include <tevent.h>
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#include "../lib/util/tevent_ntstatus.h"
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#include "auth.h"
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#include "../lib/tsocket/tsocket.h"
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#include "auth/gensec/gensec.h"
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#include "lib/param/param.h"
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#ifdef HAVE_KRB5
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#include "auth/kerberos/pac_utils.h"
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#include "nsswitch/libwbclient/wbclient.h"
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#endif
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#include "librpc/crypto/gse.h"
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#include "auth/credentials/credentials.h"
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#include "lib/param/loadparm.h"
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#include "librpc/gen_ndr/dcerpc.h"
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static NTSTATUS auth3_generate_session_info_pac(struct auth4_context *auth_ctx,
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TALLOC_CTX *mem_ctx,
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struct smb_krb5_context *smb_krb5_context,
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DATA_BLOB *pac_blob,
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const char *princ_name,
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const struct tsocket_address *remote_address,
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uint32_t session_info_flags,
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struct auth_session_info **session_info)
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{
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TALLOC_CTX *tmp_ctx;
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struct PAC_LOGON_INFO *logon_info = NULL;
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struct netr_SamInfo3 *info3_copy = NULL;
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bool is_mapped;
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bool is_guest;
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char *ntuser;
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char *ntdomain;
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char *username;
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char *rhost;
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struct passwd *pw;
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NTSTATUS status;
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int rc;
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tmp_ctx = talloc_new(mem_ctx);
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if (!tmp_ctx) {
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return NT_STATUS_NO_MEMORY;
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}
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if (pac_blob) {
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#ifdef HAVE_KRB5
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struct wbcAuthUserParams params = {};
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struct wbcAuthUserInfo *info = NULL;
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struct wbcAuthErrorInfo *err = NULL;
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wbcErr wbc_err;
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/*
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* Let winbind decode the PAC.
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* This will also store the user
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* data in the netsamlogon cache.
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*
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* We need to do this *before* we
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* call get_user_from_kerberos_info()
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* as that does a user lookup that
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* expects info in the netsamlogon cache.
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*
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* See BUG: https://bugzilla.samba.org/show_bug.cgi?id=11259
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*/
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params.level = WBC_AUTH_USER_LEVEL_PAC;
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params.password.pac.data = pac_blob->data;
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params.password.pac.length = pac_blob->length;
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become_root();
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wbc_err = wbcAuthenticateUserEx(¶ms, &info, &err);
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unbecome_root();
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/*
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* As this is merely a cache prime
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* WBC_ERR_WINBIND_NOT_AVAILABLE
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* is not a fatal error, treat it
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* as success.
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*/
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switch (wbc_err) {
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case WBC_ERR_WINBIND_NOT_AVAILABLE:
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case WBC_ERR_SUCCESS:
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break;
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case WBC_ERR_AUTH_ERROR:
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status = NT_STATUS(err->nt_status);
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wbcFreeMemory(err);
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goto done;
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default:
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status = NT_STATUS_LOGON_FAILURE;
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goto done;
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}
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status = kerberos_pac_logon_info(tmp_ctx, *pac_blob, NULL, NULL,
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NULL, NULL, 0, &logon_info);
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#else
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status = NT_STATUS_ACCESS_DENIED;
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#endif
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if (!NT_STATUS_IS_OK(status)) {
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goto done;
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}
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}
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rc = get_remote_hostname(remote_address,
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&rhost,
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tmp_ctx);
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if (rc < 0) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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if (strequal(rhost, "UNKNOWN")) {
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rhost = tsocket_address_inet_addr_string(remote_address,
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tmp_ctx);
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if (rhost == NULL) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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}
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status = get_user_from_kerberos_info(tmp_ctx, rhost,
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princ_name, logon_info,
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&is_mapped, &is_guest,
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&ntuser, &ntdomain,
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&username, &pw);
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if (!NT_STATUS_IS_OK(status)) {
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DBG_NOTICE("Failed to map kerberos principal to system user "
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"(%s)\n", nt_errstr(status));
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status = NT_STATUS_ACCESS_DENIED;
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goto done;
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}
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/* Get the info3 from the PAC data if we have it */
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if (logon_info) {
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status = create_info3_from_pac_logon_info(tmp_ctx,
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logon_info,
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&info3_copy);
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if (!NT_STATUS_IS_OK(status)) {
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goto done;
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}
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}
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/* setup the string used by %U */
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sub_set_smb_name(username);
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/* reload services so that the new %U is taken into account */
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lp_load_with_shares(get_dyn_CONFIGFILE());
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status = make_session_info_krb5(mem_ctx,
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ntuser, ntdomain, username, pw,
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info3_copy, is_guest, is_mapped, NULL /* No session key for now, caller will sort it out */,
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session_info);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("Failed to map kerberos pac to server info (%s)\n",
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nt_errstr(status)));
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status = NT_STATUS_ACCESS_DENIED;
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goto done;
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}
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DEBUG(5, (__location__ "OK: user: %s domain: %s client: %s\n",
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ntuser, ntdomain, rhost));
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status = NT_STATUS_OK;
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done:
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TALLOC_FREE(tmp_ctx);
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return status;
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}
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static struct auth4_context *make_auth4_context_s3(TALLOC_CTX *mem_ctx, struct auth_context *auth_context)
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{
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struct auth4_context *auth4_context = talloc_zero(mem_ctx, struct auth4_context);
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if (auth4_context == NULL) {
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DEBUG(10, ("failed to allocate auth4_context failed\n"));
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return NULL;
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}
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auth4_context->generate_session_info_pac = auth3_generate_session_info_pac;
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auth4_context->generate_session_info = auth3_generate_session_info;
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auth4_context->get_ntlm_challenge = auth3_get_challenge;
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auth4_context->set_ntlm_challenge = auth3_set_challenge;
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auth4_context->check_ntlm_password = auth3_check_password;
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auth4_context->private_data = talloc_steal(auth4_context, auth_context);
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return auth4_context;
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}
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NTSTATUS make_auth4_context(TALLOC_CTX *mem_ctx, struct auth4_context **auth4_context_out)
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{
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struct auth_context *auth_context;
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NTSTATUS nt_status;
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TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
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NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
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nt_status = make_auth3_context_for_ntlm(tmp_ctx, &auth_context);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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if (auth_context->make_auth4_context) {
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nt_status = auth_context->make_auth4_context(auth_context, mem_ctx, auth4_context_out);
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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} else {
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struct auth4_context *auth4_context = make_auth4_context_s3(tmp_ctx, auth_context);
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if (auth4_context == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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*auth4_context_out = talloc_steal(mem_ctx, auth4_context);
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_OK;
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}
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}
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NTSTATUS auth_generic_prepare(TALLOC_CTX *mem_ctx,
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const struct tsocket_address *remote_address,
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const struct tsocket_address *local_address,
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const char *service_description,
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struct gensec_security **gensec_security_out)
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{
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struct gensec_security *gensec_security;
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struct auth_context *auth_context;
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NTSTATUS nt_status;
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TALLOC_CTX *tmp_ctx = talloc_new(mem_ctx);
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NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
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nt_status = make_auth3_context_for_ntlm(tmp_ctx, &auth_context);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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if (auth_context->prepare_gensec) {
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nt_status = auth_context->prepare_gensec(auth_context, tmp_ctx,
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&gensec_security);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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} else {
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const struct gensec_security_ops **backends = NULL;
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struct gensec_settings *gensec_settings;
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struct loadparm_context *lp_ctx;
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size_t idx = 0;
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struct cli_credentials *server_credentials;
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const char *dns_name;
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const char *dns_domain;
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struct auth4_context *auth4_context = make_auth4_context_s3(tmp_ctx, auth_context);
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if (auth4_context == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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lp_ctx = loadparm_init_s3(tmp_ctx, loadparm_s3_helpers());
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if (lp_ctx == NULL) {
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DEBUG(10, ("loadparm_init_s3 failed\n"));
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_INVALID_SERVER_STATE;
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}
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gensec_settings = lpcfg_gensec_settings(tmp_ctx, lp_ctx);
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if (lp_ctx == NULL) {
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DEBUG(10, ("lpcfg_gensec_settings failed\n"));
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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/*
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* This should be a 'netbios domain -> DNS domain'
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* mapping, and can currently validly return NULL on
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* poorly configured systems.
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*
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* This is used for the NTLMSSP server
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*
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*/
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dns_name = get_mydnsfullname();
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if (dns_name == NULL) {
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dns_name = "";
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}
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dns_domain = get_mydnsdomname(tmp_ctx);
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if (dns_domain == NULL) {
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dns_domain = "";
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}
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gensec_settings->server_dns_name = strlower_talloc(gensec_settings, dns_name);
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if (gensec_settings->server_dns_name == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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gensec_settings->server_dns_domain = strlower_talloc(gensec_settings, dns_domain);
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if (gensec_settings->server_dns_domain == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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backends = talloc_zero_array(gensec_settings,
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const struct gensec_security_ops *, 6);
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if (backends == NULL) {
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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gensec_settings->backends = backends;
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gensec_init();
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/* These need to be in priority order, krb5 before NTLMSSP */
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#if defined(HAVE_KRB5)
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backends[idx++] = &gensec_gse_krb5_security_ops;
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#endif
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backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_NTLMSSP);
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backends[idx++] = gensec_security_by_oid(NULL, GENSEC_OID_SPNEGO);
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backends[idx++] = gensec_security_by_auth_type(NULL, DCERPC_AUTH_TYPE_SCHANNEL);
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backends[idx++] = gensec_security_by_auth_type(NULL, DCERPC_AUTH_TYPE_NCALRPC_AS_SYSTEM);
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/*
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* This is anonymous for now, because we just use it
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* to set the kerberos state at the moment
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*/
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server_credentials = cli_credentials_init_anon(tmp_ctx);
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if (!server_credentials) {
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DEBUG(0, ("auth_generic_prepare: Failed to init server credentials\n"));
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return NT_STATUS_NO_MEMORY;
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}
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cli_credentials_set_conf(server_credentials, lp_ctx);
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if (lp_security() == SEC_ADS || USE_KERBEROS_KEYTAB) {
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cli_credentials_set_kerberos_state(server_credentials, CRED_AUTO_USE_KERBEROS);
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} else {
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cli_credentials_set_kerberos_state(server_credentials, CRED_DONT_USE_KERBEROS);
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}
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nt_status = gensec_server_start(tmp_ctx, gensec_settings,
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auth4_context, &gensec_security);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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gensec_set_credentials(gensec_security, server_credentials);
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talloc_unlink(tmp_ctx, lp_ctx);
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talloc_unlink(tmp_ctx, server_credentials);
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talloc_unlink(tmp_ctx, gensec_settings);
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talloc_unlink(tmp_ctx, auth4_context);
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}
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nt_status = gensec_set_remote_address(gensec_security,
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remote_address);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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nt_status = gensec_set_local_address(gensec_security,
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local_address);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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nt_status = gensec_set_target_service_description(gensec_security,
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service_description);
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if (!NT_STATUS_IS_OK(nt_status)) {
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TALLOC_FREE(tmp_ctx);
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return nt_status;
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}
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*gensec_security_out = talloc_steal(mem_ctx, gensec_security);
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TALLOC_FREE(tmp_ctx);
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return NT_STATUS_OK;
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}
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/*
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* Check a username and password, and return the final session_info.
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* We also log the authorization of the session here, just as
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* gensec_session_info() does.
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*/
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NTSTATUS auth_check_password_session_info(struct auth4_context *auth_context,
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TALLOC_CTX *mem_ctx,
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struct auth_usersupplied_info *user_info,
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struct auth_session_info **session_info)
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{
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NTSTATUS nt_status;
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void *server_info;
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uint8_t authoritative = 0;
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if (auth_context->check_ntlm_password_send != NULL) {
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struct tevent_context *ev = NULL;
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struct tevent_req *subreq = NULL;
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bool ok;
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ev = samba_tevent_context_init(talloc_tos());
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if (ev == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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subreq = auth_context->check_ntlm_password_send(ev, ev,
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auth_context,
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user_info);
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if (subreq == NULL) {
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TALLOC_FREE(ev);
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return NT_STATUS_NO_MEMORY;
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}
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ok = tevent_req_poll_ntstatus(subreq, ev, &nt_status);
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if (!ok) {
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TALLOC_FREE(ev);
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return nt_status;
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}
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nt_status = auth_context->check_ntlm_password_recv(subreq,
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talloc_tos(),
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&authoritative,
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&server_info,
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NULL, NULL);
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TALLOC_FREE(ev);
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if (!NT_STATUS_IS_OK(nt_status)) {
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return nt_status;
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}
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} else {
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nt_status = auth_context->check_ntlm_password(auth_context,
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talloc_tos(),
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user_info,
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&authoritative,
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&server_info,
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NULL, NULL);
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if (!NT_STATUS_IS_OK(nt_status)) {
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return nt_status;
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}
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}
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nt_status = auth_context->generate_session_info(auth_context,
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mem_ctx,
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server_info,
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user_info->client.account_name,
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AUTH_SESSION_INFO_UNIX_TOKEN |
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AUTH_SESSION_INFO_DEFAULT_GROUPS |
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AUTH_SESSION_INFO_NTLM,
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session_info);
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TALLOC_FREE(server_info);
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if (!NT_STATUS_IS_OK(nt_status)) {
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return nt_status;
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}
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/*
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* This is rather redundant (the authentication has just been
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* logged, with much the same details), but because we want to
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* log all authorizations consistently (be they NLTM, NTLMSSP
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* or krb5) we log this info again as an authorization.
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*/
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log_successful_authz_event(auth_context->msg_ctx,
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auth_context->lp_ctx,
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user_info->remote_host,
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user_info->local_host,
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user_info->service_description,
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user_info->auth_description,
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AUTHZ_TRANSPORT_PROTECTION_SMB,
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*session_info);
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return nt_status;
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}
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