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1957bf11f1
It's important to have them separated from make_{server,session}_info_guest(), because there's a fundamental difference between anonymous (the client requested no authentication) and guest (the server lies about the authentication failure). When it's really an anonymous connection, we should reflect that in the resulting session info. This should fix a problem where Windows 10 tries to join a Samba hosted NT4 domain and has SMB2/3 enabled. We no longer return SMB_SETUP_GUEST or SMB2_SESSION_FLAG_IS_GUEST for true anonymous connections. The commit message from a few commit before shows the resulting auth_session_info change. BUG: https://bugzilla.samba.org/show_bug.cgi?id=13328 Signed-off-by: Stefan Metzmacher <metze@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org> Autobuild-User(master): Ralph Böhme <slow@samba.org> Autobuild-Date(master): Fri Mar 16 03:03:31 CET 2018 on sn-devel-144
240 lines
7.4 KiB
C
240 lines
7.4 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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handle NLTMSSP, server side
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Andrew Bartlett 2001-2005,2011
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Copyright (C) Stefan Metzmacher 2005
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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 "auth.h"
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#include "libcli/security/security.h"
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NTSTATUS auth3_generate_session_info(struct auth4_context *auth_context,
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TALLOC_CTX *mem_ctx,
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void *server_returned_info,
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const char *original_user_name,
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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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struct auth_user_info_dc *user_info = NULL;
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struct auth_serversupplied_info *server_info = NULL;
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NTSTATUS nt_status;
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/*
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* This is a hack, some callers...
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*
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* Some callers pass auth_user_info_dc, the SCHANNEL and
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* NCALRPC_AS_SYSTEM gensec modules.
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*
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* While the reset passes auth3_check_password() returned.
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*/
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user_info = talloc_get_type(server_returned_info,
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struct auth_user_info_dc);
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if (user_info != NULL) {
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const struct dom_sid *sid;
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int cmp;
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/*
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* This should only be called from SCHANNEL or NCALRPC_AS_SYSTEM
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*/
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if (user_info->num_sids != 1) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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sid = &user_info->sids[PRIMARY_USER_SID_INDEX];
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cmp = dom_sid_compare(sid, &global_sid_System);
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if (cmp == 0) {
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return make_session_info_system(mem_ctx, session_info);
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}
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cmp = dom_sid_compare(sid, &global_sid_Anonymous);
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if (cmp == 0) {
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return make_session_info_anonymous(mem_ctx, session_info);
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}
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return NT_STATUS_INTERNAL_ERROR;
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}
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server_info = talloc_get_type_abort(server_returned_info,
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struct auth_serversupplied_info);
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nt_status = create_local_token(mem_ctx,
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server_info,
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NULL,
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original_user_name,
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session_info);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(10, ("create_local_token failed: %s\n",
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nt_errstr(nt_status)));
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return nt_status;
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}
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return NT_STATUS_OK;
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}
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/**
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* Return the challenge as determined by the authentication subsystem
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* @return an 8 byte random challenge
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*/
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NTSTATUS auth3_get_challenge(struct auth4_context *auth4_context,
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uint8_t chal[8])
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{
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struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
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struct auth_context);
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auth_get_ntlm_challenge(auth_context, chal);
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return NT_STATUS_OK;
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}
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/**
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* NTLM2 authentication modifies the effective challenge,
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* @param challenge The new challenge value
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*/
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NTSTATUS auth3_set_challenge(struct auth4_context *auth4_context, const uint8_t *chal,
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const char *challenge_set_by)
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{
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struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
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struct auth_context);
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auth_context->challenge = data_blob_talloc(auth_context,
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chal, 8);
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NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge.data);
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auth_context->challenge_set_by = talloc_strdup(auth_context, challenge_set_by);
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NT_STATUS_HAVE_NO_MEMORY(auth_context->challenge_set_by);
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DEBUG(5, ("auth_context challenge set by %s\n", auth_context->challenge_set_by));
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DEBUG(5, ("challenge is: \n"));
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dump_data(5, auth_context->challenge.data, auth_context->challenge.length);
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return NT_STATUS_OK;
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}
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/**
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* Check the password on an NTLMSSP login.
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*
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* Return the session keys used on the connection.
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*/
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NTSTATUS auth3_check_password(struct auth4_context *auth4_context,
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TALLOC_CTX *mem_ctx,
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const struct auth_usersupplied_info *user_info,
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uint8_t *pauthoritative,
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void **server_returned_info,
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DATA_BLOB *session_key, DATA_BLOB *lm_session_key)
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{
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struct auth_context *auth_context = talloc_get_type_abort(auth4_context->private_data,
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struct auth_context);
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struct auth_usersupplied_info *mapped_user_info = NULL;
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struct auth_serversupplied_info *server_info;
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NTSTATUS nt_status;
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bool username_was_mapped;
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/*
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* Be authoritative by default.
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*/
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*pauthoritative = 1;
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/* The client has given us its machine name (which we only get over NBT transport).
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We need to possibly reload smb.conf if smb.conf includes depend on the machine name. */
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set_remote_machine_name(user_info->workstation_name, True);
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/* setup the string used by %U */
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/* sub_set_smb_name checks for weird internally */
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sub_set_smb_name(user_info->client.account_name);
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lp_load_with_shares(get_dyn_CONFIGFILE());
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nt_status = make_user_info_map(talloc_tos(),
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&mapped_user_info,
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user_info->client.account_name,
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user_info->client.domain_name,
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user_info->workstation_name,
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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->password.response.lanman.data ? &user_info->password.response.lanman : NULL,
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user_info->password.response.nt.data ? &user_info->password.response.nt : NULL,
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NULL, NULL, NULL,
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AUTH_PASSWORD_RESPONSE);
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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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mapped_user_info->logon_parameters = user_info->logon_parameters;
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mapped_user_info->flags = user_info->flags;
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nt_status = auth_check_ntlm_password(mem_ctx,
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auth_context,
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mapped_user_info,
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&server_info,
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pauthoritative);
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if (!NT_STATUS_IS_OK(nt_status)) {
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DEBUG(5,("Checking NTLMSSP password for %s\\%s failed: "
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"%s, authoritative=%u\n",
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user_info->client.domain_name,
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user_info->client.account_name,
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nt_errstr(nt_status),
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*pauthoritative));
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}
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username_was_mapped = mapped_user_info->was_mapped;
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TALLOC_FREE(mapped_user_info);
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if (!NT_STATUS_IS_OK(nt_status)) {
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nt_status = do_map_to_guest_server_info(mem_ctx,
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nt_status,
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user_info->client.account_name,
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user_info->client.domain_name,
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&server_info);
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if (NT_STATUS_IS_OK(nt_status)) {
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*pauthoritative = 1;
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*server_returned_info = talloc_steal(mem_ctx, server_info);
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}
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return nt_status;
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}
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server_info->nss_token |= username_was_mapped;
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/* Clear out the session keys, and pass them to the caller.
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* They will not be used in this form again - instead the
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* NTLMSSP code will decide on the final correct session key,
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* and supply it to create_local_token() */
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if (session_key) {
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DEBUG(10, ("Got NT session key of length %u\n",
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(unsigned int)server_info->session_key.length));
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*session_key = server_info->session_key;
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talloc_steal(mem_ctx, server_info->session_key.data);
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server_info->session_key = data_blob_null;
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}
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if (lm_session_key) {
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DEBUG(10, ("Got LM session key of length %u\n",
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(unsigned int)server_info->lm_session_key.length));
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*lm_session_key = server_info->lm_session_key;
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talloc_steal(mem_ctx, server_info->lm_session_key.data);
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server_info->lm_session_key = data_blob_null;
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}
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*server_returned_info = talloc_steal(mem_ctx, server_info);
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return nt_status;
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}
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