source3/utils/smbta-util.c

   1 /*
   2    smbta-util: tool for controlling encryption with
   3         vfs_smb_traffic_analyzer
   4    Copyright (C) 2010 Holger Hetterich <hhetter@novell.com>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include "includes.h"
  20
  21
  22 static void delete_key();
  23
  24
  25 static void help()
  26 {
  27 printf("-h              print this help message.\n");
  28 printf("-f <file>       install the key from a file and activate\n");
  29 printf("                encryption.\n");
  30 printf("-g <file>       generate a key, save it to a file, and activate encryption.\n");
  31 printf("-u              uninstall a key, and deactivate encryption.\n");
  32 printf("-c <file>       create a file from an installed key.\n");
  33 printf("-s              check if a key is installed, and print the key to stdout.\n");
  34 printf("\n");
  35 }
  36
  37 static void check_key()
  38 {       size_t size;
  39         if (!secrets_init()) {
  40                 printf("Error opening secrets database.");
  41                 exit(1);
  42         }
  43         char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
  44         if (akey != NULL) {
  45                 printf("A key is installed: %s\n",akey);
  46                 printf("Encryption activated.\n");
  47                 free(akey);
  48                 exit(0);
  49         } else printf("No key is installed.\n");
  50         exit(1);
  51 }
  52
  53 static void create_keyfile(char *filename, char *key)
  54 {
  55         FILE *keyfile;
  56         keyfile = fopen(filename, "w");
  57         if (keyfile == NULL) {
  58                 printf("error creating the keyfile!\n");
  59                 exit(0);
  60         }
  61         fprintf(keyfile, "%s", key);
  62         fclose(keyfile);
  63         printf("File '%s' has been created.\n", filename);
  64 }
  65
  66 /**
  67  * Load a key from a file. The caller has to free the
  68  * returned string.
  69  */
  70 static char *load_key_from_file(char *filename)
  71 {
  72         FILE *keyfile;
  73         char *key = malloc(sizeof(char) * 17);
  74         int l;
  75         keyfile = fopen(filename, "r");
  76         if (keyfile == NULL) {
  77                 printf("Error opening the keyfile!\n");
  78                 exit(0);
  79         }
  80         l = fscanf(keyfile, "%s", key);
  81         if (strlen(key) != 16) {
  82                 printf("Key file in wrong format\n");
  83                 fclose(keyfile);
  84                 exit(0);
  85         }
  86         return key;
  87 }
  88
  89 static void create_file_from_key(char *filename)
  90 {
  91         size_t size;
  92         char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
  93         if (akey == NULL) {
  94                 printf("No key is installed! Can't create file.\n");
  95                 exit(1);
  96         }
  97         create_keyfile(filename, akey);
  98         free(akey);
  99 }
 100
 101 /**
 102  * Generate a random key. The user has to free the returned
 103  * string.
 104  */
 105 static char *generate_key()
 106 {
 107         char *key = malloc(sizeof(char)*17);
 108         int f;
 109         srand( (unsigned)time( NULL ) );
 110         for ( f = 0; f < 16; f++) {
 111                 *(key+f) = (rand() % 128) +32;
 112         }
 113         *(key+16)='\0';
 114         printf("Random key generated.\n");
 115         return key;
 116 }
 117
 118 static void create_new_key_and_activate( char *filename )
 119 {
 120         if (!secrets_init()) {
 121                 printf("Error opening secrets database.");
 122                 exit(1);
 123         }
 124
 125         char *key = generate_key();
 126         delete_key();
 127         secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1 );
 128         printf("Key installed, encryption activated.\n");
 129         create_file_from_key(filename);
 130         free(key);
 131 }
 132
 133 static void delete_key()
 134 {
 135         size_t size;
 136         char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
 137         if (akey != NULL) {
 138                 free(akey);
 139                 secrets_delete("smb_traffic_analyzer_key");
 140                 printf("Removed installed key. Encryption deactivated.\n");
 141         } else {
 142         printf("No key is installed.\n");
 143         }
 144 }
 145
 146
 147 static void load_key_from_file_and_activate( char *filename)
 148 {
 149         char *key;
 150         char *akey;
 151         size_t size;
 152         key = load_key_from_file(filename);
 153         printf("Loaded key from %s.\n",filename);
 154         akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
 155         if (akey != NULL) {
 156                 printf("Removing the old key.\n");
 157                 delete_key();
 158         }
 159         printf("Installing the key from file %s\n",filename);
 160         secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1);
 161         free(key);
 162 }
 163
 164 static void process_arguments(int argc, char **argv)
 165 {
 166         char co;
 167         while ((co = getopt(argc, argv, "hf:g:uc:s")) != EOF) {
 168                 switch(co) {
 169                 case 'h':
 170                         help();
 171                         exit(0);
 172                 case 's':
 173                         check_key();
 174                         break;
 175                 case 'g':
 176                         create_new_key_and_activate(optarg);
 177                         break;
 178                 case 'u':
 179                         delete_key();
 180                         break;
 181                 case 'c':
 182                         create_file_from_key(optarg);
 183                         break;
 184                 case 'f':
 185                         load_key_from_file_and_activate(optarg);
 186                         break;
 187                 default:
 188                         help();
 189                         break;
 190                 }
 191         }
 192 }
 193
 194 int main(int argc, char **argv)
 195 {
 196         sec_init();
 197         load_case_tables();
 198
 199         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 200                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 201                                                 get_dyn_CONFIGFILE());
 202         exit(1);
 203         }
 204
 205         if (argc == 1) {
 206                 help();
 207                 exit(1);
 208         }
 209
 210         process_arguments(argc, argv);
 211 }