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(void);
  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         char *akey;
  40         if (!secrets_init()) {
  41                 printf("Error opening secrets database.");
  42                 exit(1);
  43         }
  44         akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
  45         if (akey != NULL) {
  46                 printf("A key is installed: %s\n",akey);
  47                 printf("Encryption activated.\n");
  48                 free(akey);
  49                 exit(0);
  50         } else printf("No key is installed.\n");
  51         exit(1);
  52 }
  53
  54 static void create_keyfile(char *filename, char *key)
  55 {
  56         FILE *keyfile;
  57         keyfile = fopen(filename, "w");
  58         if (keyfile == NULL) {
  59                 printf("error creating the keyfile!\n");
  60                 exit(1);
  61         }
  62         fprintf(keyfile, "%s", key);
  63         fclose(keyfile);
  64         printf("File '%s' has been created.\n", filename);
  65 }
  66
  67 /**
  68  * Load a key from a file. The caller has to free the
  69  * returned string.
  70  */
  71 static void load_key_from_file(char *filename, char *key)
  72 {
  73         FILE *keyfile;
  74         int l;
  75         keyfile = fopen(filename, "r");
  76         if (keyfile == NULL) {
  77                 printf("Error opening the keyfile!\n");
  78                 exit(1);
  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(1);
  85         }
  86 }
  87
  88 static void create_file_from_key(char *filename)
  89 {
  90         size_t size;
  91         char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
  92         if (akey == NULL) {
  93                 printf("No key is installed! Can't create file.\n");
  94                 exit(1);
  95         }
  96         create_keyfile(filename, akey);
  97         free(akey);
  98 }
  99
 100 /**
 101  * Generate a random key. The user has to free the returned
 102  * string.
 103  */
 104 static void generate_key(char *key)
 105 {
 106         int f;
 107         srand( (unsigned)time( NULL ) );
 108         for ( f = 0; f < 16; f++) {
 109                 *(key+f) = (rand() % 128) +32;
 110         }
 111         *(key+16)='\0';
 112         printf("Random key generated.\n");
 113 }
 114
 115 static void create_new_key_and_activate( char *filename )
 116 {
 117         char key[17] = {0};
 118
 119         if (!secrets_init()) {
 120                 printf("Error opening secrets database.");
 121                 exit(1);
 122         }
 123
 124         generate_key(key);
 125         delete_key();
 126         secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1 );
 127         printf("Key installed, encryption activated.\n");
 128         create_file_from_key(filename);
 129 }
 130
 131 static void delete_key(void)
 132 {
 133         size_t size;
 134         char *akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
 135         if (akey != NULL) {
 136                 free(akey);
 137                 secrets_delete("smb_traffic_analyzer_key");
 138                 printf("Removed installed key. Encryption deactivated.\n");
 139         } else {
 140         printf("No key is installed.\n");
 141         }
 142 }
 143
 144
 145 static void load_key_from_file_and_activate( char *filename)
 146 {
 147         char key[17] = {0};
 148         char *akey;
 149         size_t size;
 150         load_key_from_file(filename, key);
 151         printf("Loaded key from %s.\n",filename);
 152         akey = (char *) secrets_fetch("smb_traffic_analyzer_key", &size);
 153         if (akey != NULL) {
 154                 printf("Removing the old key.\n");
 155                 delete_key();
 156         }
 157         printf("Installing the key from file %s\n",filename);
 158         secrets_store("smb_traffic_analyzer_key", key, strlen(key)+1);
 159 }
 160
 161 static void process_arguments(int argc, char **argv)
 162 {
 163         char co;
 164         while ((co = getopt(argc, argv, "hf:g:uc:s")) != EOF) {
 165                 switch(co) {
 166                 case 'h':
 167                         help();
 168                         exit(0);
 169                 case 's':
 170                         check_key();
 171                         break;
 172                 case 'g':
 173                         create_new_key_and_activate(optarg);
 174                         break;
 175                 case 'u':
 176                         delete_key();
 177                         break;
 178                 case 'c':
 179                         create_file_from_key(optarg);
 180                         break;
 181                 case 'f':
 182                         load_key_from_file_and_activate(optarg);
 183                         break;
 184                 default:
 185                         help();
 186                         break;
 187                 }
 188         }
 189 }
 190
 191 int main(int argc, char **argv)
 192 {
 193         sec_init();
 194         load_case_tables();
 195
 196         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
 197                 fprintf(stderr, "Can't load %s - run testparm to debug it\n",
 198                                                 get_dyn_CONFIGFILE());
 199         exit(1);
 200         }
 201
 202         if (argc == 1) {
 203                 help();
 204                 exit(1);
 205         }
 206
 207         process_arguments(argc, argv);
 208         exit(0);
 209 }