Add smbta-util to manage the encryption key.

This program allows the administrator to enable or disable AES
encryption when using vfs_smb_traffic_analyzer. It also generates new
keys, stores them to a file, so that the file can be reused on another
client or server.

1 files changed, 211 insertions, 0 deletions

diff --git a/source3/utils/smbta-util.c b/source3/utils/smbta-util.c
new file mode 100644
index 0000000000..13686ae7a0
--- /dev/null
+++ b/source3/utils/smbta-util.c
@@ -0,0 +1,211 @@
+/*
+   smbta-util: tool for controlling encryption with
+	vfs_smb_traffic_analyzer
+   Copyright (C) 2010 Holger Hetterich <hhetter@novell.com>
+
+   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"
+
+
+static void delete_key();
+
+
+static void help()
+{
+printf("-h 		print this help message.\n");
+printf("-f <file>	install the key from a file and activate\n");
+printf("		encryption.\n");
+printf("-g <file>	generate a key, save it to a file, and activate encryption.\n");
+printf("-u		uninstall a key, and deactivate encryption.\n");
+printf("-c <file>	create a file from an installed key.\n");
+printf("-s		check if a key is installed, and print the key to stdout.\n");
+printf("\n");
+}
+
+static void check_key()
+{	size_t size;
+	if (!secrets_init()) {
+		printf("Error opening secrets database.");
+		exit(1);
+        }
+	char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
+	if (akey != NULL) {
+		printf("A key is installed: %s\n",akey);
+		printf("Encryption activated.\n");
+		free(akey);
+		exit(0);
+	} else printf("No key is installed.\n");
+	exit(1);
+}
+
+static void create_keyfile(char *filename, char *key)
+{
+	FILE *keyfile;
+	keyfile = fopen(filename, "w");
+	if (keyfile == NULL) {
+		printf("error creating the keyfile!\n");
+		exit(0);
+	}
+	fprintf(keyfile, "%s", key);
+	fclose(keyfile);
+	printf("File '%s' has been created.\n", filename);
+}
+
+/**
+ * Load a key from a file. The caller has to free the
+ * returned string.
+ */
+static char *load_key_from_file(char *filename)
+{
+	FILE *keyfile;
+	char *key = malloc(sizeof(char) * 17);
+	int l;
+	keyfile = fopen(filename, "r");
+	if (keyfile == NULL) {
+		printf("Error opening the keyfile!\n");
+		exit(0);
+	}
+	l = fscanf(keyfile, "%s", key);
+	if (strlen(key) != 16) {
+		printf("Key file in wrong format\n");
+		fclose(keyfile);
+		exit(0);
+	}
+	return key;
+}
+
+static void create_file_from_key(char *filename)
+{
+	size_t size;
+	char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
+	if (akey == NULL) {
+		printf("No key is installed! Can't create file.\n");
+		exit(1);
+	}
+	create_keyfile(filename, akey);
+	free(akey);
+}
+
+/**
+ * Generate a random key. The user has to free the returned
+ * string.
+ */
+static char *generate_key()
+{
+	char *key = malloc(sizeof(char)*17);
+	int f;
+	srand( (unsigned)time( NULL ) );
+	for ( f = 0; f < 16; f++) {
+		*(key+f) = (rand() % 128) +32;
+	}
+	*(key+16)='\0';
+	printf("Random key generated.\n");
+	return key;
+}
+
+static void create_new_key_and_activate( char *filename )
+{
+	if (!secrets_init()) {
+		printf("Error opening secrets database.");
+		exit(1);
+	}
+
+	char *key = generate_key();
+	delete_key();
+	secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1 );
+	printf("Key installed, encryption activated.\n");
+	create_file_from_key(filename);
+	free(key);
+}
+
+static void delete_key()
+{
+	size_t size;
+	char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
+	if (akey != NULL) {
+		free(akey);
+		secrets_delete("smb_traffic_analyzer_key");
+		printf("Removed installed key. Encryption deactivated.\n");
+	} else {
+	printf("No key is installed.\n");
+	}
+}
+
+
+static void load_key_from_file_and_activate( char *filename)
+{
+	char *key;
+	char *akey;
+	size_t size;
+	key = load_key_from_file(filename);
+	printf("Loaded key from %s.\n",filename);
+	akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
+	if (akey != NULL) {
+		printf("Removing the old key.\n");
+		delete_key();
+	}
+	printf("Installing the key from file %s\n",filename);
+	secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1);
+	free(key);
+}
+
+static void process_arguments(int argc, char **argv)
+{
+	char co;
+	while ((co = getopt(argc, argv, "hf:g:uc:s")) != EOF) {
+		switch(co) {
+		case 'h':
+			help();
+			exit(0);
+		case 's':
+			check_key();
+			break;
+		case 'g':
+			create_new_key_and_activate(optarg);
+			break;
+		case 'u':
+			delete_key();
+			break;
+		case 'c':
+			create_file_from_key(optarg);
+			break;
+		case 'f':
+			load_key_from_file_and_activate(optarg);
+			break;
+		default:
+			help();
+			break;
+		}
+	}
+}
+
+int main(int argc, char **argv)
+{
+	sec_init();
+	load_case_tables();
+
+	if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
+		fprintf(stderr, "Can't load %s - run testparm to debug it\n",
+						get_dyn_CONFIGFILE());
+	exit(1);
+	}
+
+	if (argc == 1) {
+		help();
+		exit(1);
+	}
+
+	process_arguments(argc, argv);
+}