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/*
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"
#include "secrets.h"
static void delete_key(void);
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;
char *akey;
if (!secrets_init()) {
printf("Error opening secrets database.");
exit(1);
}
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(1);
}
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 void load_key_from_file(char *filename, char *key)
{
FILE *keyfile;
int l;
keyfile = fopen(filename, "r");
if (keyfile == NULL) {
printf("Error opening the keyfile!\n");
exit(1);
}
l = fscanf(keyfile, "%s", key);
if (strlen(key) != 16) {
printf("Key file in wrong format\n");
fclose(keyfile);
exit(1);
}
}
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 void generate_key(char *key)
{
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");
}
static void create_new_key_and_activate( char *filename )
{
char key[17] = {0};
if (!secrets_init()) {
printf("Error opening secrets database.");
exit(1);
}
generate_key(key);
delete_key();
secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1 );
printf("Key installed, encryption activated.\n");
create_file_from_key(filename);
}
static void delete_key(void)
{
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[17] = {0};
char *akey;
size_t size;
load_key_from_file(filename, key);
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);
}
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);
exit(0);
}
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