r12411: Add 'net samdump keytab <keytab>'.

This extracts a remote windows domain into a keytab, suitable for use
in ethereal for kerberos decryption.

For the moment, like net samdump and net samsync, the 'password
server' smb.conf option must be set to the binding string for the
server. eg:

password server = ncacn_np:mypdc

Andrew Bartlett
(This used to be commit 272013438f53bb168f74e09eb70fc96112b84772)

1 files changed, 144 insertions, 0 deletions

diff --git a/source4/libnet/libnet_samdump_keytab.c b/source4/libnet/libnet_samdump_keytab.c
new file mode 100644
index 0000000000..deaa282801
--- /dev/null
+++ b/source4/libnet/libnet_samdump_keytab.c
@@ -0,0 +1,144 @@
+/* 
+   Unix SMB/CIFS implementation.
+   
+   Extract kerberos keys from a remote SamSync server
+
+   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
+   
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+
+#include "includes.h"
+#include "libnet/libnet.h"
+#include "librpc/gen_ndr/ndr_netlogon.h"
+#include "librpc/gen_ndr/ndr_samr.h"
+#include "system/kerberos.h"
+#include "auth/kerberos/kerberos.h"
+
+static NTSTATUS samdump_keytab_handle_user(TALLOC_CTX *mem_ctx,
+					    const char *keytab_name,
+					    struct creds_CredentialState *creds,
+					    struct netr_DELTA_ENUM *delta) 
+{
+	struct netr_DELTA_USER *user = delta->delta_union.user;
+	const char *username = user->account_name.string;
+	struct cli_credentials *credentials;
+	int ret;
+
+	if (!user->nt_password_present) {
+		/* We can't do anything here */
+		return NT_STATUS_OK;
+	}
+
+	credentials = cli_credentials_init(mem_ctx);
+	if (!credentials) {
+		return NT_STATUS_NO_MEMORY;
+	}
+	cli_credentials_set_conf(credentials);
+	cli_credentials_set_username(credentials, username, CRED_SPECIFIED);
+
+	/* We really should consult ldap in the main SamSync code, and
+	 * pass a value in here */
+	cli_credentials_set_kvno(credentials, 0);
+	cli_credentials_set_nt_hash(credentials, &user->ntpassword, CRED_SPECIFIED);
+	ret = cli_credentials_set_keytab_name(credentials, keytab_name, CRED_SPECIFIED);
+	if (ret) {
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+
+	ret = cli_credentials_update_keytab(credentials);
+	if (ret) {
+		return NT_STATUS_UNSUCCESSFUL;
+	}
+	
+	return NT_STATUS_OK;
+}
+
+static NTSTATUS libnet_samdump_keytab_fn(TALLOC_CTX *mem_ctx, 		
+					 void *private, 			
+					 struct creds_CredentialState *creds,
+					 enum netr_SamDatabaseID database,
+					 struct netr_DELTA_ENUM *delta,
+					 char **error_string)
+{
+	NTSTATUS nt_status = NT_STATUS_OK;
+	const char *keytab_name = private;
+
+	*error_string = NULL;
+	switch (delta->delta_type) {
+	case NETR_DELTA_USER:
+	{
+		/* not interested in builtin users */
+		if (database == SAM_DATABASE_DOMAIN) {
+			nt_status = samdump_keytab_handle_user(mem_ctx, 
+							       keytab_name,
+							       creds,
+							       delta);
+			break;
+		}
+	}
+	default:
+		/* Can't dump them all right now */
+		break;
+	}
+	return nt_status;
+}
+
+static NTSTATUS libnet_SamDump_keytab_netlogon(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamDump_keytab *r)
+{
+	NTSTATUS nt_status;
+	struct libnet_SamSync r2;
+
+	r2.error_string = NULL;
+	r2.delta_fn = libnet_samdump_keytab_fn;
+	r2.fn_ctx = r->keytab_name;
+	r2.machine_account = NULL; /* TODO:  Create a machine account, fill this in, and the delete it */
+	nt_status = libnet_SamSync_netlogon(ctx, mem_ctx, &r2);
+	r->error_string = r2.error_string;
+
+	if (!NT_STATUS_IS_OK(nt_status)) {
+		return nt_status;
+	}
+
+	return nt_status;
+}
+
+
+
+static NTSTATUS libnet_SamDump_keytab_generic(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamDump_keytab *r)
+{
+	NTSTATUS nt_status;
+	struct libnet_SamDump_keytab r2;
+	r2.level = LIBNET_SAMDUMP_NETLOGON;
+	r2.error_string = NULL;
+	r2.keytab_name = r->keytab_name;
+	nt_status = libnet_SamDump_keytab(ctx, mem_ctx, &r2);
+	r->error_string = r2.error_string;
+	
+	return nt_status;
+}
+
+NTSTATUS libnet_SamDump_keytab(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, struct libnet_SamDump_keytab *r)
+{
+	switch (r->level) {
+	case LIBNET_SAMDUMP_GENERIC:
+		return libnet_SamDump_keytab_generic(ctx, mem_ctx, r);
+	case LIBNET_SAMDUMP_NETLOGON:
+		return libnet_SamDump_keytab_netlogon(ctx, mem_ctx, r);
+	}
+
+	return NT_STATUS_INVALID_LEVEL;
+}