mirror of https://github.com/jrbrtsn/ban2fail
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575
ban2fail.c
575
ban2fail.c
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@ -1,575 +0,0 @@
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/***************************************************************************
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* Copyright (C) 2019 by John D. Robertson *
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* john@rrci.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
|
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* it under the terms of the GNU General Public License as published by *
|
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* the Free Software Foundation; either version 3 of the License, or *
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||||
* (at your option) any later version. *
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* *
|
||||
* This program is distributed in the hope that it will be useful, *
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||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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||||
* *
|
||||
* You should have received a copy of the GNU General Public License *
|
||||
* along with this program; if not, write to the *
|
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* Free Software Foundation, Inc., *
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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***************************************************************************/
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#include <assert.h>
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#include <ctype.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <getopt.h>
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#include <limits.h>
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#include <string.h>
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#include <sys/file.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include "ban2fail.h"
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#include "cntry.h"
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#include "ez_dirent.h"
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#include "ez_gzfile.h"
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#include "ez_stdio.h"
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#include "ez_stdlib.h"
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#include "iptables.h"
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#include "logEntry.h"
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#include "logFile.h"
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#include "logType.h"
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#include "map.h"
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#include "maxoff.h"
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#include "str.h"
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#include "util.h"
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enum {
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BLOCKED_FLG =1<<0,
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WOULD_BLOCK_FLG =1<<1,
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UNJUST_BLOCK_FLG =1<<2,
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WHITELIST_FLG =1<<3
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};
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/*==================================================================*/
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/*=================== Support structs ==============================*/
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/*==================================================================*/
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struct cntryStat {
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char *cntry;
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unsigned count;
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};
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/* Need this for initialization from configuration file */
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struct initInfo {
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const char *symStr;
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int (*init_f)(CFGMAP *map, char *symStr);
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};
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/*==================================================================*/
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/*================= Forward declarations ===========================*/
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/*==================================================================*/
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static int cntryStat_count_qsort(const void *p1, const void *p2);
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static int configure(CFGMAP *h_cfgmap, const char *pfix);
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static int logentry_count_qsort(const void *p1, const void *p2);
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static int map_byCountries(LOGENTRY *e, MAP *h_map);
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static int stub_init(CFGMAP *map, char *symStr);
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static int whitelist_init(CFGMAP *h_cfgmap, char *symStr);
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||||
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/*==================================================================*/
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/*========================= static data ============================*/
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/*==================================================================*/
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struct Global G= {
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.cacheDir= CACHEDIR,
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.lockPath= LOCKPATH,
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.version= {
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.major= 0,
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.minor= 10,
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.patch= 2
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}
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};
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const static struct initInfo S_initInfo_arr[] = {
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{.symStr= "MAX_OFFENSES", .init_f= MAXOFF_init},
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{.symStr= "LOGTYPE", .init_f= LOGTYPE_init},
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{/* Terminating member */}
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};
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static const struct bitTuple BlockBitTuples[]= {
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{.name= "BLOCKED", .bit= BLOCKED_FLG},
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{.name= "+WouldBLOCK+", .bit= WOULD_BLOCK_FLG},
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{.name= "-UnjustBLOCK-", .bit= UNJUST_BLOCK_FLG},
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{.name= "Whitelisted", .bit= WHITELIST_FLG},
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||||
{/* Terminating member */}
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};
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||||
|
||||
/*================ Local only static struct ======================*/
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static struct {
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MAP addr_map;
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CFGMAP cfgmap;
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PTRVEC toBlock_vec,
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toUnblock_vec;
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} S;
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/*==================================================================*/
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||||
/*======================== main() ==================================*/
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||||
/*==================================================================*/
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||||
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||||
/* Enums for long options */
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||||
enum {
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||||
VERSION_OPT_ENUM=128, /* Larger than any printable character */
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HELP_OPT_ENUM
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||||
};
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int
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main(int argc, char **argv)
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||||
/***************************************************************
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* Program execution begins here.
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||||
*/
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{
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int rtn= EXIT_FAILURE,
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lock_fd= -1;
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char *confFile= CONFIGFILE;
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||||
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/* Prepare static data */
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// global
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MAP_constructor(&G.logType_map, 10, 10);
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// local
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MAP_constructor(&S.addr_map, 1000, 200);
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PTRVEC_constructor(&S.toBlock_vec, 100000);
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PTRVEC_constructor(&S.toUnblock_vec, 100000);
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||||
|
||||
{ /*=== Parse command line arguments ===*/
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||||
int c, errflg= 0;
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||||
extern char *optarg;
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||||
extern int optind, optopt;
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||||
|
||||
for(;;) {
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||||
|
||||
static const struct option long_options[]= {
|
||||
{"help", no_argument, 0, HELP_OPT_ENUM},
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||||
{"version", no_argument, 0, VERSION_OPT_ENUM},
|
||||
{}
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||||
};
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||||
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||||
int c, option_ndx= 0;
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||||
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c= getopt_long(argc, argv, ":act:v", long_options, &option_ndx);
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||||
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if(-1 == c) break;
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switch(c) {
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/* print usage help */
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||||
case HELP_OPT_ENUM:
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++errflg;
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break;
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||||
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||||
case 'c':
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G.flags |= GLB_LIST_CNTRY_FLG;
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break;
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||||
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case 'a':
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||||
G.flags |= GLB_LIST_ADDR_FLG;
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break;
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||||
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case 't':
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G.flags |= GLB_DONT_IPTABLE_FLG;
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G.cacheDir= CACHEDIR "-test";
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G.lockPath= LOCKPATH "-test";
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confFile= optarg;
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||||
break;
|
||||
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||||
case 'v':
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G.flags |= GLB_VERBOSE_FLG;
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||||
break;
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||||
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||||
case VERSION_OPT_ENUM:
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ez_fprintf(stderr, "ban2fail v%d.%d.%d\n", G.version.major, G.version.minor, G.version.patch);
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return 0;
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||||
case '?':
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||||
ez_fprintf(stderr, "Unrecognized option: -%c\n", optopt);
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++errflg;
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break;
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||||
}
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||||
}
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||||
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||||
if(errflg) {
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ez_fprintf(stderr,
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||||
"Usage:\n"
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||||
"%s [options] [-t confFile]\n"
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||||
" --help\tprint this usage message.\n"
|
||||
" -a\t\tList results by Address\n"
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||||
" -c\t\tlist results by Country\n"
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||||
" -t confFile\tTest confFile, do not apply iptables rules\n"
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||||
" -v\t\tVerbose information about unrecognized configuration info\n"
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||||
" --version\tprint the version number and exit.\n"
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||||
, argv[0]
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);
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goto abort;
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||||
}
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||||
} /* Done with command line arguments */
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||||
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||||
/* Make sure we will be able to run iptables */
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if(getuid()) {
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eprintf("ERROR: You must be root to run iptables!");
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goto abort;
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}
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||||
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||||
{ /*============== Read the configuration file ==============*/
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if(!CFGMAP_file_constructor(&S.cfgmap, confFile)) {
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eprintf("ERROR: failed to read configuration from \"%s\"", confFile);
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goto abort;
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}
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/* Just leave the S.cfgmap in place, so all the value strings
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* don't need to be copied.
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*/
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}
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{ /*============== Obtain a lock on our lockfile ==============*/
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/* Make sure the file exists by open()'ing */
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lock_fd= open(G.lockPath, O_CREAT|O_WRONLY|O_CLOEXEC, 0640);
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if(-1 == lock_fd) {
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sys_eprintf("ERROR: open(\"%s\") failed");
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goto abort;
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}
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/* Let's get a exclusive lock */
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int rc= flock(lock_fd, LOCK_EX|LOCK_NB);
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if(-1 == rc) {
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sys_eprintf("ERROR: flock(\"%s\") failed", G.lockPath);
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||||
goto abort;
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||||
}
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}
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||||
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||||
{ /*============== Open our cache, instantiate LOGTYPE objects ==============*/
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/* Make the directory if needed */
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if(access(G.cacheDir, F_OK)) {
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||||
/* errno will be set if access() fails */
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errno= 0;
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ez_mkdir(G.cacheDir, 0700);
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}
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if(G.flags & GLB_PRINT_MASK) {
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ez_fprintf(stdout, "=============== ban2fail v%d.%d.%d =============\n"
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, G.version.major
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, G.version.minor
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, G.version.patch
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||||
);
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fflush(stdout);
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}
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||||
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||||
{ /*============== Implement configuration ==============*/
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||||
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if(configure(&S.cfgmap, NULL)) {
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eprintf("ERROR: failed to realize configuration in \"%s\"", confFile);
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goto abort;
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||||
}
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||||
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if(G.flags & GLB_VERBOSE_FLG) { /* Warn about unused symbols */
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||||
CFGMAP_print_unused_symbols(&S.cfgmap, stdout);
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fflush(stdout);
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||||
}
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||||
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||||
/* Just leave the S.cfgmap in place, so all the value strings
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||||
* don't need to be copied.
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||||
*/
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||||
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||||
}
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||||
|
||||
{ /* Check cache for logType directories not in our current map */
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||||
DIR *dir= ez_opendir(G.cacheDir);
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||||
struct dirent *entry;
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||||
|
||||
while((entry= ez_readdir(dir))) {
|
||||
|
||||
/* Skip uninteresting entries */
|
||||
if('.' == *entry->d_name) continue;
|
||||
|
||||
LOGTYPE *t= MAP_findStrItem(&G.logType_map, entry->d_name);
|
||||
/* If there is a matching entry, then do not delete results */
|
||||
if(t)
|
||||
continue;
|
||||
|
||||
/* Make the path with filename */
|
||||
static char pathBuf[PATH_MAX];
|
||||
snprintf(pathBuf, sizeof(pathBuf), "%s/%s", G.cacheDir, entry->d_name);
|
||||
|
||||
/* Remove unused directory & contents. */
|
||||
ez_rmdir_recursive(pathBuf);
|
||||
|
||||
}
|
||||
ez_closedir(dir);
|
||||
}
|
||||
|
||||
/* We're done with disk I/O, so release lock */
|
||||
flock(lock_fd, LOCK_UN);
|
||||
ez_close(lock_fd);
|
||||
lock_fd= -1;
|
||||
|
||||
unsigned nFound= 0;
|
||||
MAP_visitAllEntries(&G.logType_map, (int(*)(void*,void*))LOGTYPE_offenseCount, &nFound);
|
||||
|
||||
if(G.flags & GLB_PRINT_MASK) {
|
||||
ez_fprintf(stdout, "===== Found %u total offenses =====\n", nFound);
|
||||
fflush(stdout);
|
||||
}
|
||||
}
|
||||
|
||||
{ /******* Now get a map of LOGENTRY objects that have combined counts ****/
|
||||
|
||||
/* List by address. Make a addr_map of LOGENTRY objects with composite counts */
|
||||
MAP_visitAllEntries(&G.logType_map, (int(*)(void*,void*))LOGTYPE_map_addr, &S.addr_map);
|
||||
|
||||
/* Augment list of all blocked IP's by those which currently have not match in the log files */
|
||||
IPTABLES_fill_in_missing(&S.addr_map);
|
||||
|
||||
/* Count up total */
|
||||
unsigned nItems= MAP_numItems(&S.addr_map);
|
||||
|
||||
{
|
||||
LOGENTRY *leArr[nItems];
|
||||
MAP_fetchAllItems(&S.addr_map, (void**)leArr);
|
||||
qsort(leArr, nItems, sizeof(LOGENTRY*), logentry_count_qsort);
|
||||
|
||||
/* Process each LOGENTRY item */
|
||||
for(unsigned i= 0; i < nItems; ++i) {
|
||||
int flags=0;
|
||||
|
||||
LOGENTRY *e= leArr[i];
|
||||
|
||||
if(IPTABLES_is_currently_blocked(e->addr))
|
||||
flags |= BLOCKED_FLG;
|
||||
|
||||
int nAllowed= MAXOFF_allowed(e->addr);
|
||||
|
||||
if(-1 == nAllowed)
|
||||
flags |= WHITELIST_FLG;
|
||||
|
||||
if((flags & WHITELIST_FLG || e->count <= nAllowed) &&
|
||||
(flags & BLOCKED_FLG))
|
||||
{
|
||||
|
||||
flags |= UNJUST_BLOCK_FLG;
|
||||
PTRVEC_addTail(&S.toUnblock_vec, e->addr);
|
||||
}
|
||||
|
||||
if(!(flags & BLOCKED_FLG) &&
|
||||
!(flags & WHITELIST_FLG) &&
|
||||
e->count > nAllowed)
|
||||
{
|
||||
|
||||
flags |= WOULD_BLOCK_FLG;
|
||||
PTRVEC_addTail(&S.toBlock_vec, e->addr);
|
||||
}
|
||||
|
||||
/* Print out only for list option */
|
||||
if(G.flags & GLB_LIST_ADDR_FLG) {
|
||||
|
||||
ez_fprintf(stdout, "%-15s\t%5u/%-4u offenses %s (%s)\n"
|
||||
, e->addr
|
||||
, e->count
|
||||
, nAllowed
|
||||
, e->cntry[0] ? e->cntry : "--"
|
||||
, bits2str(flags, BlockBitTuples)
|
||||
);
|
||||
}
|
||||
|
||||
} /*--- End of LOGENTRY processing ---*/
|
||||
|
||||
/* Take care of summary blocking and reporting */
|
||||
unsigned n2Block= PTRVEC_numItems(&S.toBlock_vec);
|
||||
unsigned n2Unblock= PTRVEC_numItems(&S.toUnblock_vec);
|
||||
|
||||
if(!(G.flags & GLB_DONT_IPTABLE_FLG)) {
|
||||
|
||||
if(n2Block) {
|
||||
|
||||
if(IPTABLES_block_addresses(&S.toBlock_vec, 10)) {
|
||||
eprintf("ERROR: cannot block addresses!");
|
||||
goto abort;
|
||||
}
|
||||
printf("Blocked %u new hosts\n", n2Block);
|
||||
}
|
||||
|
||||
if(n2Unblock) {
|
||||
|
||||
if(IPTABLES_unblock_addresses(&S.toUnblock_vec, 10)) {
|
||||
eprintf("ERROR: cannot unblock addresses!");
|
||||
goto abort;
|
||||
}
|
||||
printf("Unblocked %u hosts\n", n2Unblock);
|
||||
}
|
||||
|
||||
} else {
|
||||
|
||||
if(n2Block)
|
||||
printf("Would block %u new hosts\n", n2Block);
|
||||
|
||||
if(n2Unblock)
|
||||
printf("Would unblock %u new hosts\n", n2Unblock);
|
||||
}
|
||||
|
||||
|
||||
/* List offenses by country if directed to do so */
|
||||
if(G.flags & GLB_LIST_CNTRY_FLG) {
|
||||
|
||||
/* Map for indexing cntryStat objects */
|
||||
static MAP byCntry_map;
|
||||
MAP_sinit(&byCntry_map, 100, 100);
|
||||
|
||||
/* Build index by trawling existing by-address map */
|
||||
MAP_visitAllEntries(&S.addr_map, (int(*)(void*,void*))map_byCountries, &byCntry_map);
|
||||
|
||||
/* Now get all cntStat handles in a vector */
|
||||
unsigned vec_sz= MAP_numItems(&byCntry_map);
|
||||
struct cntryStat *rtn_vec[vec_sz];
|
||||
|
||||
MAP_fetchAllItems(&byCntry_map, (void**)rtn_vec);
|
||||
|
||||
/* Sort high to low */
|
||||
qsort(rtn_vec, vec_sz, sizeof(struct cntryStat*), cntryStat_count_qsort);
|
||||
|
||||
/* Print results */
|
||||
for(unsigned i= 0; i < vec_sz; ++i) {
|
||||
|
||||
struct cntryStat *cs= rtn_vec[i];
|
||||
ez_fprintf(stdout, "%2s %5u offenses\n"
|
||||
, cs->cntry[0] ? cs->cntry : "--"
|
||||
, cs->count
|
||||
);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
rtn= EXIT_SUCCESS;
|
||||
abort:
|
||||
|
||||
/* Make sure lock file is unlocked */
|
||||
if(-1 != lock_fd) {
|
||||
flock(lock_fd, LOCK_UN);
|
||||
ez_close(lock_fd);
|
||||
}
|
||||
return rtn;
|
||||
}
|
||||
|
||||
|
||||
/*==================================================================*/
|
||||
/*============== Supporting functions ==============================*/
|
||||
/*==================================================================*/
|
||||
|
||||
static int
|
||||
logentry_count_qsort(const void *p1, const void *p2)
|
||||
/***************************************************************
|
||||
* qsort functor puts large counts on top.
|
||||
*/
|
||||
{
|
||||
const LOGENTRY *le1= *(const LOGENTRY *const*)p1,
|
||||
*le2= *(const LOGENTRY *const*)p2;
|
||||
|
||||
if(le1->count > le2->count) return -1;
|
||||
if(le1->count < le2->count) return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
cntryStat_count_qsort(const void *p1, const void *p2)
|
||||
/***************************************************************
|
||||
* qsort functor puts large counts on top.
|
||||
*/
|
||||
{
|
||||
const struct cntryStat
|
||||
*cs1= *(const struct cntryStat *const*)p1,
|
||||
*cs2= *(const struct cntryStat *const*)p2;
|
||||
|
||||
if(cs1->count > cs2->count) return -1;
|
||||
if(cs1->count < cs2->count) return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int
|
||||
configure(CFGMAP *h_cfgmap, const char *pfix)
|
||||
/*****************************************************************
|
||||
* dynamic initialization from contents of configuration
|
||||
* dictionary.
|
||||
*/
|
||||
{
|
||||
int rtn= 1;
|
||||
const CFGMAP_ENTRY *pCde;
|
||||
const struct initInfo *pIi;
|
||||
|
||||
for(pIi= S_initInfo_arr; pIi->symStr; ++pIi) {
|
||||
char buf[1024];
|
||||
/* Create the symbol we will look for */
|
||||
snprintf(buf, sizeof(buf), "%s\\%s", pfix ? pfix : "", pIi->symStr);
|
||||
|
||||
if((pCde= CFGMAP_find(h_cfgmap, buf))) {
|
||||
unsigned i;
|
||||
for(i= 0; i < CFGMAP_ENTRY_numValues(pCde); ++i) {
|
||||
/* Create the name for this object */
|
||||
snprintf(buf, sizeof(buf), "%s\\%s", pfix ? pfix : "", CFGMAP_ENTRY_value(pCde, i));
|
||||
/* Call the initialization function */
|
||||
if((*pIi->init_f)(h_cfgmap, buf)) goto abort;
|
||||
/* recurse with longer pfix */
|
||||
if(configure(h_cfgmap, buf)) {
|
||||
eprintf("ERROR: initialization function failed.");
|
||||
goto abort;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
rtn= 0;
|
||||
|
||||
abort:
|
||||
return rtn;
|
||||
}
|
||||
|
||||
#ifdef DEBUG
|
||||
static int
|
||||
stub_init(CFGMAP *map, char *symStr)
|
||||
/*****************************************************************
|
||||
* Stand-in xxx_init() function until a proper one is implemented.
|
||||
*/
|
||||
{
|
||||
eprintf("HERE, symStr= \"%s\"", symStr);
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
static int
|
||||
map_byCountries(LOGENTRY *e, MAP *h_map)
|
||||
/**************************************************************
|
||||
* Generate a "by country" map of cntryStat objects.
|
||||
*/
|
||||
{
|
||||
struct cntryStat *cs= MAP_findStrItem(h_map, e->cntry);
|
||||
if(!cs) {
|
||||
cs= calloc(1, sizeof(*cs));
|
||||
cs->cntry= e->cntry;
|
||||
MAP_addStrKey(h_map, cs->cntry, cs);
|
||||
}
|
||||
|
||||
cs->count += e->count;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue