mirror of
https://github.com/jrbrtsn/ban2fail
synced 2024-06-16 11:58:01 +00:00
570 lines
16 KiB
C
570 lines
16 KiB
C
/***************************************************************************
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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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* *
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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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* *
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* You should have received a copy of the GNU General Public License *
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* 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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/*========================= 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= 1
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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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/* 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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/* 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[]= {
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{"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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c= getopt_long(argc, argv, ":act:v", long_options, &option_ndx);
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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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case 'c':
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G.flags |= GLB_LIST_CNTRY_FLG;
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break;
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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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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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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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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"
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" -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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/* 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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{ /*============== 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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{ /*============== 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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{ /*============== Implement configuration ==============*/
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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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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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/* 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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{ /* 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))) {
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/* Skip uninteresting entries */
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if('.' == *entry->d_name) continue;
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LOGTYPE *t= MAP_findStrItem(&G.logType_map, entry->d_name);
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/* If there is a matching entry, then do not delete results */
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if(t)
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continue;
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/* Make the path with filename */
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static char pathBuf[PATH_MAX];
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snprintf(pathBuf, sizeof(pathBuf), "%s/%s", G.cacheDir, entry->d_name);
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/* Remove unused directory & contents. */
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ez_rmdir_recursive(pathBuf);
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}
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ez_closedir(dir);
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}
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/* We're done with disk I/O, so release lock */
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flock(lock_fd, LOCK_UN);
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ez_close(lock_fd);
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lock_fd= -1;
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unsigned nFound= 0;
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MAP_visitAllEntries(&G.logType_map, (int(*)(void*,void*))LOGTYPE_offenseCount, &nFound);
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if(G.flags & GLB_PRINT_MASK) {
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ez_fprintf(stdout, "===== Found %u total offenses =====\n", nFound);
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fflush(stdout);
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}
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}
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{ /******* Now get a map of LOGENTRY objects that have combined counts ****/
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/* List by address. Make a addr_map of LOGENTRY objects with composite counts */
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MAP_visitAllEntries(&G.logType_map, (int(*)(void*,void*))LOGTYPE_map_addr, &S.addr_map);
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unsigned nItems= MAP_numItems(&S.addr_map);
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{
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LOGENTRY *leArr[nItems];
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MAP_fetchAllItems(&S.addr_map, (void**)leArr);
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qsort(leArr, nItems, sizeof(LOGENTRY*), logentry_count_qsort);
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/* Process each LOGENTRY item */
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for(unsigned i= 0; i < nItems; ++i) {
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int flags=0;
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LOGENTRY *e= leArr[i];
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if(IPTABLES_is_currently_blocked(e->addr))
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flags |= BLOCKED_FLG;
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int nAllowed= MAXOFF_allowed(e->addr);
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if(-1 == nAllowed)
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flags |= WHITELIST_FLG;
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if((-1 == nAllowed || e->count <= nAllowed) &&
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(flags & BLOCKED_FLG)) {
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flags |= UNJUST_BLOCK_FLG;
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PTRVEC_addTail(&S.toUnblock_vec, e->addr);
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}
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if(!(flags & BLOCKED_FLG) &&
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-1 != nAllowed &&
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e->count > nAllowed)
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{
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flags |= WOULD_BLOCK_FLG;
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PTRVEC_addTail(&S.toBlock_vec, e->addr);
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}
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/* Print out only for list option */
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if(G.flags & GLB_LIST_ADDR_FLG) {
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ez_fprintf(stdout, "%-15s\t%5u/%-4u offenses %s (%s)\n"
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, e->addr
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, e->count
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, nAllowed
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, e->cntry[0] ? e->cntry : "--"
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, bits2str(flags, BlockBitTuples)
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);
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}
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} /*--- End of LOGENTRY processing ---*/
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/* Take care of summary blocking and reporting */
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unsigned n2Block= PTRVEC_numItems(&S.toBlock_vec);
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unsigned n2Unblock= PTRVEC_numItems(&S.toUnblock_vec);
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if(!(G.flags & GLB_DONT_IPTABLE_FLG)) {
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if(n2Block) {
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if(IPTABLES_block_addresses(&S.toBlock_vec, 10)) {
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eprintf("ERROR: cannot block addresses!");
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goto abort;
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}
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printf("Blocked %u new hosts\n", n2Block);
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}
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if(n2Unblock) {
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if(IPTABLES_unblock_addresses(&S.toUnblock_vec, 10)) {
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eprintf("ERROR: cannot unblock addresses!");
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goto abort;
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}
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printf("Unblocked %u hosts\n", n2Unblock);
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}
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} else {
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if(n2Block)
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printf("Would block %u new hosts\n", n2Block);
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if(n2Unblock)
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printf("Would unblock %u new hosts\n", n2Unblock);
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}
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/* List offenses by country if directed to do so */
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if(G.flags & GLB_LIST_CNTRY_FLG) {
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/* Map for indexing cntryStat objects */
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static MAP byCntry_map;
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MAP_sinit(&byCntry_map, 100, 100);
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/* Build index by trawling existing by-address map */
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MAP_visitAllEntries(&S.addr_map, (int(*)(void*,void*))map_byCountries, &byCntry_map);
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/* Now get all cntStat handles in a vector */
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unsigned vec_sz= MAP_numItems(&byCntry_map);
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struct cntryStat *rtn_vec[vec_sz];
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MAP_fetchAllItems(&byCntry_map, (void**)rtn_vec);
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/* Sort high to low */
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qsort(rtn_vec, vec_sz, sizeof(struct cntryStat*), cntryStat_count_qsort);
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/* Print results */
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for(unsigned i= 0; i < vec_sz; ++i) {
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struct cntryStat *cs= rtn_vec[i];
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ez_fprintf(stdout, "%2s %5u offenses\n"
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, cs->cntry[0] ? cs->cntry : "--"
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, cs->count
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);
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}
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}
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}
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}
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rtn= EXIT_SUCCESS;
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abort:
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/* Make sure lock file is unlocked */
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if(-1 != lock_fd) {
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flock(lock_fd, LOCK_UN);
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ez_close(lock_fd);
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}
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return rtn;
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}
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/*==================================================================*/
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/*============== Supporting functions ==============================*/
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/*==================================================================*/
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static int
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logentry_count_qsort(const void *p1, const void *p2)
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/***************************************************************
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* qsort functor puts large counts on top.
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*/
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{
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const LOGENTRY *le1= *(const LOGENTRY *const*)p1,
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*le2= *(const LOGENTRY *const*)p2;
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if(le1->count > le2->count) return -1;
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if(le1->count < le2->count) return 1;
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return 0;
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}
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static int
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cntryStat_count_qsort(const void *p1, const void *p2)
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/***************************************************************
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* qsort functor puts large counts on top.
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*/
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{
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const struct cntryStat
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*cs1= *(const struct cntryStat *const*)p1,
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*cs2= *(const struct cntryStat *const*)p2;
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if(cs1->count > cs2->count) return -1;
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if(cs1->count < cs2->count) return 1;
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return 0;
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}
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static int
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configure(CFGMAP *h_cfgmap, const char *pfix)
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/*****************************************************************
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* dynamic initialization from contents of configuration
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* dictionary.
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*/
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{
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int rtn= 1;
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const CFGMAP_ENTRY *pCde;
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const struct initInfo *pIi;
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for(pIi= S_initInfo_arr; pIi->symStr; ++pIi) {
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char buf[1024];
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/* Create the symbol we will look for */
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snprintf(buf, sizeof(buf), "%s\\%s", pfix ? pfix : "", pIi->symStr);
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if((pCde= CFGMAP_find(h_cfgmap, buf))) {
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unsigned i;
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for(i= 0; i < CFGMAP_ENTRY_numValues(pCde); ++i) {
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/* Create the name for this object */
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snprintf(buf, sizeof(buf), "%s\\%s", pfix ? pfix : "", CFGMAP_ENTRY_value(pCde, i));
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/* Call the initialization function */
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if((*pIi->init_f)(h_cfgmap, buf)) goto abort;
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/* recurse with longer pfix */
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if(configure(h_cfgmap, buf)) {
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eprintf("ERROR: initialization function failed.");
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goto abort;
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}
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}
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}
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}
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rtn= 0;
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abort:
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return rtn;
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}
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#ifdef DEBUG
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static int
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stub_init(CFGMAP *map, char *symStr)
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/*****************************************************************
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* Stand-in xxx_init() function until a proper one is implemented.
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*/
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{
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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;
|
|
}
|
|
|
|
|