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e03e738dfc
We should not limit the possible encryption algorithms to the currently known ones. BUG: https://bugzilla.samba.org/show_bug.cgi?id=15374 Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Volker Lendecke <vl@samba.org> Autobuild-User(master): Volker Lendecke <vl@samba.org> Autobuild-Date(master): Wed May 17 07:34:28 UTC 2023 on atb-devel-224
133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
/*
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* Copyright (c) 2020 Andreas Schneider <asn@samba.org>
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*
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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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*
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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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*
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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 "librpc/gen_ndr/security.h"
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#include "librpc/gen_ndr/auth.h"
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#include "lib/crypto/gnutls_helpers.h"
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#include "libcli/security/dom_sid.h"
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#include "libcli/security/security_token.h"
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#include "libcli/smb/smb2_constants.h"
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#include "dcerpc_helper.h"
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static bool smb3_sid_parse(const struct dom_sid *sid,
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uint16_t *pdialect,
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uint16_t *pencrypt,
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uint16_t *pcipher)
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{
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uint16_t dialect;
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uint16_t encrypt;
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uint16_t cipher;
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if (sid->sub_auths[0] != global_sid_Samba_SMB3.sub_auths[0]) {
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return false;
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}
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dialect = sid->sub_auths[1];
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if (dialect > 0x03ff) {
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return false;
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}
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encrypt = sid->sub_auths[2];
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if (encrypt > 0x0002) {
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return false;
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}
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cipher = sid->sub_auths[3];
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if (cipher > 256) {
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/*
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* It is unlikely that we
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* ever have more then 256
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* encryption algorithms
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*/
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return false;
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}
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if (pdialect != NULL) {
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*pdialect = dialect;
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}
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if (pencrypt != NULL) {
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*pencrypt = encrypt;
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}
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if (pcipher != NULL) {
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*pcipher = cipher;
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}
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return true;
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}
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bool dcerpc_is_transport_encrypted(struct auth_session_info *session_info)
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{
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struct security_token *token = session_info->security_token;
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struct dom_sid smb3_dom_sid = global_sid_Samba_SMB3;
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const struct dom_sid *smb3_sid = NULL;
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uint16_t dialect = 0;
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uint16_t encrypt = 0;
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uint16_t cipher = 0;
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size_t num_smb3_sids;
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bool ok;
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num_smb3_sids = security_token_count_flag_sids(token,
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&smb3_dom_sid,
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3,
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&smb3_sid);
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if (num_smb3_sids > 1) {
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DBG_ERR("ERROR: The SMB3 SID has been detected %zu times\n",
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num_smb3_sids);
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return false;
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}
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if (smb3_sid == NULL) {
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return false;
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}
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ok = smb3_sid_parse(smb3_sid, &dialect, &encrypt, &cipher);
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if (!ok) {
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DBG_ERR("Failed to parse SMB3 SID!\n");
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return false;
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}
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DBG_DEBUG("SMB SID - dialect: %#04x, encrypt: %#04x, cipher: %#04x\n",
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dialect,
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encrypt,
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cipher);
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if (dialect < SMB3_DIALECT_REVISION_300) {
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DBG_DEBUG("Invalid SMB3 dialect!\n");
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return false;
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}
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if (encrypt != DCERPC_SMB_ENCRYPTION_REQUIRED) {
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DBG_DEBUG("Invalid SMB3 encryption!\n");
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return false;
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}
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switch (cipher) {
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case SMB2_ENCRYPTION_AES128_CCM:
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case SMB2_ENCRYPTION_AES128_GCM:
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break;
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default:
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DBG_DEBUG("Invalid SMB3 cipher!\n");
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return false;
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}
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return true;
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}
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