mirror of
https://github.com/samba-team/samba.git
synced 2024-12-23 17:34:34 +03:00
Add netlogond auth method
This authenticates against a local running samba4 using SamLogonEx. We retrieve the machine password using samba4's mymachinepwd script and store the schannel key for re-use in secrets.tdb.
This commit is contained in:
Volker Lendecke
parent
2f6026248e
commit
439086099a
@ -638,6 +638,7 @@ AUTH_SERVER_OBJ = auth/auth_server.o
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AUTH_UNIX_OBJ = auth/auth_unix.o
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AUTH_WINBIND_OBJ = auth/auth_winbind.o
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AUTH_SCRIPT_OBJ = auth/auth_script.o
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AUTH_NETLOGOND_OBJ = auth/auth_netlogond.o
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AUTH_OBJ = auth/auth.o @AUTH_STATIC@ auth/auth_util.o auth/token_util.o \
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auth/auth_compat.o auth/auth_ntlmssp.o \
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@ -2197,6 +2198,10 @@ bin/script.@SHLIBEXT@: $(BINARY_PREREQS) $(AUTH_SCRIPT_OBJ)
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@echo "Building plugin $@"
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@$(SHLD_MODULE) $(AUTH_SCRIPT_OBJ)
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bin/netlogond.@SHLIBEXT@: $(BINARY_PREREQS) $(AUTH_NETLOGOND_OBJ)
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@echo "Building plugin $@"
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@$(SHLD_MODULE) $(AUTH_NETLOGOND_OBJ)
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bin/smbserver.@SHLIBEXT@: $(BINARY_PREREQS) $(AUTH_SERVER_OBJ)
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@echo "Building plugin $@"
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@$(SHLD_MODULE) $(AUTH_SERVER_OBJ)
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321
source3/auth/auth_netlogond.c
Normal file
321
source3/auth/auth_netlogond.c
Normal file
@ -0,0 +1,321 @@
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/*
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Unix SMB/CIFS implementation.
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Authenticate against a netlogon pipe listening on a unix domain socket
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Copyright (C) Volker Lendecke 2008
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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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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_AUTH
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static NTSTATUS netlogond_validate(TALLOC_CTX *mem_ctx,
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const struct auth_context *auth_context,
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const char *ncalrpc_sockname,
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uint8_t schannel_key[16],
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const auth_usersupplied_info *user_info,
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struct netr_SamInfo3 **pinfo3,
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NTSTATUS *schannel_bind_result)
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{
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struct rpc_pipe_client *p;
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struct cli_pipe_auth_data *auth;
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struct netr_SamInfo3 *info3 = NULL;
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NTSTATUS status;
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*schannel_bind_result = NT_STATUS_OK;
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status = rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpc_sockname,
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&ndr_table_netlogon.syntax_id, &p);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
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nt_errstr(status)));
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return status;
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}
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status = rpccli_schannel_bind_data(p, lp_workgroup(),
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PIPE_AUTH_LEVEL_PRIVACY,
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schannel_key, &auth);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpccli_schannel_bind_data failed: %s\n",
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nt_errstr(status)));
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TALLOC_FREE(p);
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return status;
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}
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status = rpc_pipe_bind(p, auth);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status)));
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TALLOC_FREE(p);
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*schannel_bind_result = status;
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return status;
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}
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/*
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* We have to fake a struct dcinfo, so that
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* rpccli_netlogon_sam_network_logon_ex can decrypt the session keys.
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*/
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p->dc = talloc(p, struct dcinfo);
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if (p->dc == NULL) {
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DEBUG(0, ("talloc failed\n"));
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TALLOC_FREE(p);
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return NT_STATUS_NO_MEMORY;
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}
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memcpy(p->dc->sess_key, schannel_key, 16);
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status = rpccli_netlogon_sam_network_logon_ex(
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p, p,
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user_info->logon_parameters,/* flags such as 'allow
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* workstation logon' */
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global_myname(), /* server name */
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user_info->smb_name, /* user name logging on. */
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user_info->client_domain, /* domain name */
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user_info->wksta_name, /* workstation name */
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(uchar *)auth_context->challenge.data, /* 8 byte challenge. */
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user_info->lm_resp, /* lanman 24 byte response */
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user_info->nt_resp, /* nt 24 byte response */
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&info3); /* info3 out */
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DEBUG(10, ("rpccli_netlogon_sam_network_logon_ex returned %s\n",
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nt_errstr(status)));
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if (!NT_STATUS_IS_OK(status)) {
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TALLOC_FREE(p);
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return status;
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}
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*pinfo3 = talloc_move(mem_ctx, &info3);
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TALLOC_FREE(p);
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return NT_STATUS_OK;
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}
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static char *mymachinepw(TALLOC_CTX *mem_ctx)
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{
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fstring pwd;
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const char *script;
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char *to_free = NULL;
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ssize_t nread;
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int ret, fd;
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script = lp_parm_const_string(
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GLOBAL_SECTION_SNUM, "auth_netlogond", "machinepwscript",
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NULL);
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if (script == NULL) {
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to_free = talloc_asprintf(talloc_tos(), "%s/%s",
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get_dyn_SBINDIR(), "mymachinepw");
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script = to_free;
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}
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if (script == NULL) {
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return NULL;
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}
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ret = smbrun(script, &fd);
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DEBUG(ret ? 0 : 3, ("mymachinepw: Running the command `%s' gave %d\n",
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script, ret));
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TALLOC_FREE(to_free);
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if (ret != 0) {
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return NULL;
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}
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pwd[sizeof(pwd)-1] = '\0';
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nread = read(fd, pwd, sizeof(pwd)-1);
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close(fd);
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if (nread <= 0) {
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DEBUG(3, ("mymachinepwd: Could not read password\n"));
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return NULL;
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}
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DEBUG(0, ("pwd: %d [%s]\n", (int)nread, pwd));
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if (pwd[nread-1] == '\n') {
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pwd[nread-1] = '\0';
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}
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return talloc_strdup(mem_ctx, pwd);
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}
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static NTSTATUS check_netlogond_security(const struct auth_context *auth_context,
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void *my_private_data,
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TALLOC_CTX *mem_ctx,
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const auth_usersupplied_info *user_info,
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auth_serversupplied_info **server_info)
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{
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TALLOC_CTX *frame = talloc_stackframe();
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struct netr_SamInfo3 *info3 = NULL;
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struct rpc_pipe_client *p;
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struct cli_pipe_auth_data *auth;
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uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
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char *plaintext_machinepw;
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uint8_t machine_password[16];
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uint8_t schannel_key[16];
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NTSTATUS schannel_bind_result, status;
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struct named_mutex *mutex;
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const char *ncalrpcsock;
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ncalrpcsock = lp_parm_const_string(
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GLOBAL_SECTION_SNUM, "auth_netlogond", "socket", NULL);
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if (ncalrpcsock == NULL) {
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ncalrpcsock = talloc_asprintf(talloc_tos(), "%s/%s",
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get_dyn_NCALRPCDIR(), "DEFAULT");
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}
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if (ncalrpcsock == NULL) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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if (!secrets_fetch_local_schannel_key(schannel_key)) {
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goto new_key;
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}
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status = netlogond_validate(talloc_tos(), auth_context, ncalrpcsock,
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schannel_key, user_info, &info3,
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&schannel_bind_result);
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DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status)));
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if (NT_STATUS_IS_OK(status)) {
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goto okay;
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}
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if (NT_STATUS_IS_OK(schannel_bind_result)) {
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/*
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* This is a real failure from the DC
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*/
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goto done;
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}
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new_key:
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mutex = grab_named_mutex(talloc_tos(), "LOCAL_SCHANNEL_KEY", 60);
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if (mutex == NULL) {
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DEBUG(10, ("Could not get mutex LOCAL_SCHANNEL_KEY\n"));
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status = NT_STATUS_ACCESS_DENIED;
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goto done;
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}
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DEBUG(10, ("schannel bind failed, setting up new key\n"));
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status = rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpcsock,
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&ndr_table_netlogon.syntax_id, &p);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
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nt_errstr(status)));
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goto done;
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}
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status = rpccli_anon_bind_data(p, &auth);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpccli_anon_bind_data failed: %s\n",
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nt_errstr(status)));
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goto done;
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}
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status = rpc_pipe_bind(p, auth);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status)));
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goto done;
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}
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TALLOC_FREE(auth);
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plaintext_machinepw = mymachinepw(talloc_tos());
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if (plaintext_machinepw == NULL) {
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status = NT_STATUS_NO_MEMORY;
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goto done;
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}
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E_md4hash(plaintext_machinepw, machine_password);
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TALLOC_FREE(plaintext_machinepw);
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status = rpccli_netlogon_setup_creds(
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p, global_myname(), lp_workgroup(), global_myname(),
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global_myname(), machine_password, SEC_CHAN_BDC, &neg_flags);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("rpccli_netlogon_setup_creds failed: %s\n",
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nt_errstr(status)));
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goto done;
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}
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memcpy(schannel_key, p->dc->sess_key, 16);
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secrets_store_local_schannel_key(schannel_key);
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TALLOC_FREE(p);
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/*
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* Retry the authentication with the mutex held. This way nobody else
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* can step on our toes.
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*/
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status = netlogond_validate(talloc_tos(), auth_context, ncalrpcsock,
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schannel_key, user_info, &info3,
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&schannel_bind_result);
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DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status)));
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if (!NT_STATUS_IS_OK(status)) {
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goto done;
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}
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okay:
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status = make_server_info_info3(mem_ctx, user_info->smb_name,
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user_info->domain, server_info,
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info3);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("make_server_info_info3 failed: %s\n",
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nt_errstr(status)));
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TALLOC_FREE(frame);
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return status;
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}
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status = NT_STATUS_OK;
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done:
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TALLOC_FREE(frame);
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return status;
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}
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/* module initialisation */
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static NTSTATUS auth_init_netlogond(struct auth_context *auth_context,
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const char *param,
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auth_methods **auth_method)
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{
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if (!make_auth_methods(auth_context, auth_method)) {
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return NT_STATUS_NO_MEMORY;
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}
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(*auth_method)->name = "netlogond";
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(*auth_method)->auth = check_netlogond_security;
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return NT_STATUS_OK;
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}
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NTSTATUS auth_netlogond_init(void)
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{
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smb_register_auth(AUTH_INTERFACE_VERSION, "netlogond",
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auth_init_netlogond);
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return NT_STATUS_OK;
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}
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@ -404,7 +404,7 @@ AC_SUBST(DYNEXP)
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dnl Add modules that have to be built by default here
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dnl These have to be built static:
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default_static_modules="pdb_smbpasswd pdb_tdbsam rpc_lsarpc rpc_samr rpc_winreg rpc_initshutdown rpc_dssetup rpc_wkssvc rpc_svcctl2 rpc_ntsvcs2 rpc_netlogon rpc_netdfs rpc_srvsvc rpc_spoolss rpc_eventlog2 auth_sam auth_unix auth_winbind auth_server auth_domain auth_builtin vfs_default nss_info_template"
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default_static_modules="pdb_smbpasswd pdb_tdbsam rpc_lsarpc rpc_samr rpc_winreg rpc_initshutdown rpc_dssetup rpc_wkssvc rpc_svcctl2 rpc_ntsvcs2 rpc_netlogon rpc_netdfs rpc_srvsvc rpc_spoolss rpc_eventlog2 auth_sam auth_unix auth_winbind auth_server auth_domain auth_builtin auth_netlogond vfs_default nss_info_template"
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dnl These are preferably build shared, and static if dlopen() is not available
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default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_full_audit vfs_netatalk vfs_fake_perms vfs_default_quota vfs_readonly vfs_cap vfs_expand_msdfs vfs_shadow_copy vfs_shadow_copy2 charset_CP850 charset_CP437 auth_script vfs_readahead vfs_xattr_tdb vfs_streams_xattr vfs_acl_xattr vfs_smb_traffic_analyzer"
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@ -6077,6 +6077,7 @@ SMB_MODULE(auth_server, \$(AUTH_SERVER_OBJ), "bin/smbserver.$SHLIBEXT", AUTH)
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SMB_MODULE(auth_domain, \$(AUTH_DOMAIN_OBJ), "bin/domain.$SHLIBEXT", AUTH)
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SMB_MODULE(auth_builtin, \$(AUTH_BUILTIN_OBJ), "bin/builtin.$SHLIBEXT", AUTH)
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SMB_MODULE(auth_script, \$(AUTH_SCRIPT_OBJ), "bin/script.$SHLIBEXT", AUTH)
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SMB_MODULE(auth_netlogond, \$(AUTH_NETLOGOND_OBJ), "bin/netlogond.$SHLIBEXT", AUTH)
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SMB_SUBSYSTEM(AUTH,auth/auth.o)
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SMB_MODULE(vfs_default, \$(VFS_DEFAULT_OBJ), "bin/default.$SHLIBEXT", VFS)
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@ -46,6 +46,8 @@ bool password_ok(const char *smb_name, DATA_BLOB password_blob);
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void attempt_machine_password_change(void);
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NTSTATUS auth_domain_init(void);
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NTSTATUS auth_netlogond_init(void);
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/* The following definitions come from auth/auth_ntlmssp.c */
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NTSTATUS auth_ntlmssp_start(AUTH_NTLMSSP_STATE **auth_ntlmssp_state);
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Block a user