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-rw-r--r--source3/auth/auth_netlogond.c321
1 files changed, 321 insertions, 0 deletions
diff --git a/source3/auth/auth_netlogond.c b/source3/auth/auth_netlogond.c
new file mode 100644
index 0000000000..a57f3b74a3
--- /dev/null
+++ b/source3/auth/auth_netlogond.c
@@ -0,0 +1,321 @@
+/*
+ Unix SMB/CIFS implementation.
+ Authenticate against a netlogon pipe listening on a unix domain socket
+ Copyright (C) Volker Lendecke 2008
+
+ 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"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_AUTH
+
+static NTSTATUS netlogond_validate(TALLOC_CTX *mem_ctx,
+ const struct auth_context *auth_context,
+ const char *ncalrpc_sockname,
+ uint8_t schannel_key[16],
+ const auth_usersupplied_info *user_info,
+ struct netr_SamInfo3 **pinfo3,
+ NTSTATUS *schannel_bind_result)
+{
+ struct rpc_pipe_client *p;
+ struct cli_pipe_auth_data *auth;
+ struct netr_SamInfo3 *info3 = NULL;
+ NTSTATUS status;
+
+ *schannel_bind_result = NT_STATUS_OK;
+
+ status = rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpc_sockname,
+ &ndr_table_netlogon.syntax_id, &p);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
+ nt_errstr(status)));
+ return status;
+ }
+
+ status = rpccli_schannel_bind_data(p, lp_workgroup(),
+ PIPE_AUTH_LEVEL_PRIVACY,
+ schannel_key, &auth);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpccli_schannel_bind_data failed: %s\n",
+ nt_errstr(status)));
+ TALLOC_FREE(p);
+ return status;
+ }
+
+ status = rpc_pipe_bind(p, auth);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status)));
+ TALLOC_FREE(p);
+ *schannel_bind_result = status;
+ return status;
+ }
+
+ /*
+ * We have to fake a struct dcinfo, so that
+ * rpccli_netlogon_sam_network_logon_ex can decrypt the session keys.
+ */
+
+ p->dc = talloc(p, struct dcinfo);
+ if (p->dc == NULL) {
+ DEBUG(0, ("talloc failed\n"));
+ TALLOC_FREE(p);
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ memcpy(p->dc->sess_key, schannel_key, 16);
+
+ status = rpccli_netlogon_sam_network_logon_ex(
+ p, p,
+ user_info->logon_parameters,/* flags such as 'allow
+ * workstation logon' */
+ global_myname(), /* server name */
+ user_info->smb_name, /* user name logging on. */
+ user_info->client_domain, /* domain name */
+ user_info->wksta_name, /* workstation name */
+ (uchar *)auth_context->challenge.data, /* 8 byte challenge. */
+ user_info->lm_resp, /* lanman 24 byte response */
+ user_info->nt_resp, /* nt 24 byte response */
+ &info3); /* info3 out */
+
+ DEBUG(10, ("rpccli_netlogon_sam_network_logon_ex returned %s\n",
+ nt_errstr(status)));
+
+ if (!NT_STATUS_IS_OK(status)) {
+ TALLOC_FREE(p);
+ return status;
+ }
+
+ *pinfo3 = talloc_move(mem_ctx, &info3);
+
+ TALLOC_FREE(p);
+ return NT_STATUS_OK;
+}
+
+static char *mymachinepw(TALLOC_CTX *mem_ctx)
+{
+ fstring pwd;
+ const char *script;
+ char *to_free = NULL;
+ ssize_t nread;
+ int ret, fd;
+
+ script = lp_parm_const_string(
+ GLOBAL_SECTION_SNUM, "auth_netlogond", "machinepwscript",
+ NULL);
+
+ if (script == NULL) {
+ to_free = talloc_asprintf(talloc_tos(), "%s/%s",
+ get_dyn_SBINDIR(), "mymachinepw");
+ script = to_free;
+ }
+ if (script == NULL) {
+ return NULL;
+ }
+
+ ret = smbrun(script, &fd);
+ DEBUG(ret ? 0 : 3, ("mymachinepw: Running the command `%s' gave %d\n",
+ script, ret));
+ TALLOC_FREE(to_free);
+
+ if (ret != 0) {
+ return NULL;
+ }
+
+ pwd[sizeof(pwd)-1] = '\0';
+
+ nread = read(fd, pwd, sizeof(pwd)-1);
+ close(fd);
+
+ if (nread <= 0) {
+ DEBUG(3, ("mymachinepwd: Could not read password\n"));
+ return NULL;
+ }
+
+ DEBUG(0, ("pwd: %d [%s]\n", (int)nread, pwd));
+
+ if (pwd[nread-1] == '\n') {
+ pwd[nread-1] = '\0';
+ }
+
+ return talloc_strdup(mem_ctx, pwd);
+}
+
+static NTSTATUS check_netlogond_security(const struct auth_context *auth_context,
+ void *my_private_data,
+ TALLOC_CTX *mem_ctx,
+ const auth_usersupplied_info *user_info,
+ auth_serversupplied_info **server_info)
+{
+ TALLOC_CTX *frame = talloc_stackframe();
+ struct netr_SamInfo3 *info3 = NULL;
+ struct rpc_pipe_client *p;
+ struct cli_pipe_auth_data *auth;
+ uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_FLAGS;
+ char *plaintext_machinepw;
+ uint8_t machine_password[16];
+ uint8_t schannel_key[16];
+ NTSTATUS schannel_bind_result, status;
+ struct named_mutex *mutex;
+ const char *ncalrpcsock;
+
+ ncalrpcsock = lp_parm_const_string(
+ GLOBAL_SECTION_SNUM, "auth_netlogond", "socket", NULL);
+
+ if (ncalrpcsock == NULL) {
+ ncalrpcsock = talloc_asprintf(talloc_tos(), "%s/%s",
+ get_dyn_NCALRPCDIR(), "DEFAULT");
+ }
+
+ if (ncalrpcsock == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+
+ if (!secrets_fetch_local_schannel_key(schannel_key)) {
+ goto new_key;
+ }
+
+ status = netlogond_validate(talloc_tos(), auth_context, ncalrpcsock,
+ schannel_key, user_info, &info3,
+ &schannel_bind_result);
+
+ DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status)));
+
+ if (NT_STATUS_IS_OK(status)) {
+ goto okay;
+ }
+
+ if (NT_STATUS_IS_OK(schannel_bind_result)) {
+ /*
+ * This is a real failure from the DC
+ */
+ goto done;
+ }
+
+ new_key:
+
+ mutex = grab_named_mutex(talloc_tos(), "LOCAL_SCHANNEL_KEY", 60);
+ if (mutex == NULL) {
+ DEBUG(10, ("Could not get mutex LOCAL_SCHANNEL_KEY\n"));
+ status = NT_STATUS_ACCESS_DENIED;
+ goto done;
+ }
+
+ DEBUG(10, ("schannel bind failed, setting up new key\n"));
+
+ status = rpc_pipe_open_ncalrpc(talloc_tos(), ncalrpcsock,
+ &ndr_table_netlogon.syntax_id, &p);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpc_pipe_open_ncalrpc failed: %s\n",
+ nt_errstr(status)));
+ goto done;
+ }
+
+ status = rpccli_anon_bind_data(p, &auth);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpccli_anon_bind_data failed: %s\n",
+ nt_errstr(status)));
+ goto done;
+ }
+
+ status = rpc_pipe_bind(p, auth);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpc_pipe_bind failed: %s\n", nt_errstr(status)));
+ goto done;
+ }
+
+ TALLOC_FREE(auth);
+
+ plaintext_machinepw = mymachinepw(talloc_tos());
+ if (plaintext_machinepw == NULL) {
+ status = NT_STATUS_NO_MEMORY;
+ goto done;
+ }
+
+ E_md4hash(plaintext_machinepw, machine_password);
+
+ TALLOC_FREE(plaintext_machinepw);
+
+ status = rpccli_netlogon_setup_creds(
+ p, global_myname(), lp_workgroup(), global_myname(),
+ global_myname(), machine_password, SEC_CHAN_BDC, &neg_flags);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("rpccli_netlogon_setup_creds failed: %s\n",
+ nt_errstr(status)));
+ goto done;
+ }
+
+ memcpy(schannel_key, p->dc->sess_key, 16);
+ secrets_store_local_schannel_key(schannel_key);
+
+ TALLOC_FREE(p);
+
+ /*
+ * Retry the authentication with the mutex held. This way nobody else
+ * can step on our toes.
+ */
+
+ status = netlogond_validate(talloc_tos(), auth_context, ncalrpcsock,
+ schannel_key, user_info, &info3,
+ &schannel_bind_result);
+
+ DEBUG(10, ("netlogond_validate returned %s\n", nt_errstr(status)));
+
+ if (!NT_STATUS_IS_OK(status)) {
+ goto done;
+ }
+
+ okay:
+
+ status = make_server_info_info3(mem_ctx, user_info->smb_name,
+ user_info->domain, server_info,
+ info3);
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("make_server_info_info3 failed: %s\n",
+ nt_errstr(status)));
+ TALLOC_FREE(frame);
+ return status;
+ }
+
+ status = NT_STATUS_OK;
+
+ done:
+ TALLOC_FREE(frame);
+ return status;
+}
+
+/* module initialisation */
+static NTSTATUS auth_init_netlogond(struct auth_context *auth_context,
+ const char *param,
+ auth_methods **auth_method)
+{
+ if (!make_auth_methods(auth_context, auth_method)) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ (*auth_method)->name = "netlogond";
+ (*auth_method)->auth = check_netlogond_security;
+ return NT_STATUS_OK;
+}
+
+NTSTATUS auth_netlogond_init(void)
+{
+ smb_register_auth(AUTH_INTERFACE_VERSION, "netlogond",
+ auth_init_netlogond);
+ return NT_STATUS_OK;
+}
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