package/iptables/patches/002-layer7-1.5nbd.patch

   1 Index: iptables-1.3.7/extensions/.layer7-test
   2 ===================================================================
   3 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
   4 +++ iptables-1.3.7/extensions/.layer7-test      2007-06-04 13:21:43.708331992 +0200
   5 @@ -0,0 +1,2 @@
   6 +#! /bin/sh
   7 +[ -f $KERNEL_DIR/include/linux/netfilter_ipv4/ipt_layer7.h ] && echo layer7
   8 Index: iptables-1.3.7/extensions/ipt_layer7.h
   9 ===================================================================
  10 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  11 +++ iptables-1.3.7/extensions/ipt_layer7.h      2007-06-04 13:21:43.708331992 +0200
  12 @@ -0,0 +1,27 @@
  13 +/*
  14 +  By Matthew Strait <quadong@users.sf.net>, Dec 2003.
  15 +  http://l7-filter.sf.net
  16 +
  17 +  This program is free software; you can redistribute it and/or
  18 +  modify it under the terms of the GNU General Public License
  19 +  as published by the Free Software Foundation; either version
  20 +  2 of the License, or (at your option) any later version.
  21 +  http://www.gnu.org/licenses/gpl.txt
  22 +*/
  23 +
  24 +#ifndef _IPT_LAYER7_H
  25 +#define _IPT_LAYER7_H
  26 +
  27 +#define MAX_PATTERN_LEN 8192
  28 +#define MAX_PROTOCOL_LEN 256
  29 +
  30 +typedef char *(*proc_ipt_search) (char *, char, char *);
  31 +
  32 +struct ipt_layer7_info {
  33 +    char protocol[MAX_PROTOCOL_LEN];
  34 +    char invert:1;
  35 +    char pattern[MAX_PATTERN_LEN];
  36 +       char pkt;
  37 +};
  38 +
  39 +#endif /* _IPT_LAYER7_H */
  40 Index: iptables-1.3.7/extensions/libipt_layer7.c
  41 ===================================================================
  42 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  43 +++ iptables-1.3.7/extensions/libipt_layer7.c   2007-06-04 13:21:43.709331840 +0200
  44 @@ -0,0 +1,358 @@
  45 +/*
  46 +   Shared library add-on to iptables to add layer 7 matching support.
  47 +
  48 +   By Matthew Strait <quadong@users.sf.net>, Oct 2003.
  49 +
  50 +   http://l7-filter.sf.net
  51 +
  52 +   This program is free software; you can redistribute it and/or
  53 +   modify it under the terms of the GNU General Public License
  54 +   as published by the Free Software Foundation; either version
  55 +   2 of the License, or (at your option) any later version.
  56 +   http://www.gnu.org/licenses/gpl.txt
  57 +
  58 +   Based on libipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>
  59 +*/
  60 +
  61 +#define _GNU_SOURCE
  62 +#include <stdio.h>
  63 +#include <netdb.h>
  64 +#include <string.h>
  65 +#include <stdlib.h>
  66 +#include <getopt.h>
  67 +#include <ctype.h>
  68 +#include <dirent.h>
  69 +
  70 +#include <iptables.h>
  71 +#include "ipt_layer7.h"
  72 +
  73 +#define MAX_FN_LEN 256
  74 +
  75 +static char l7dir[MAX_FN_LEN] = "\0";
  76 +
  77 +/* Function which prints out usage message. */
  78 +static void help(void)
  79 +{
  80 +       printf(
  81 +       "LAYER7 match v%s options:\n"
  82 +       "--l7dir <directory>  : Look for patterns here instead of /etc/l7-protocols/\n"
  83 +       "                       (--l7dir must be specified before --l7proto if used!)\n"
  84 +       "--l7proto [!] <name> : Match the protocol defined in /etc/l7-protocols/name.pat\n"
  85 +       "--l7pkt              : Skip connection tracking and match individual packets\n",
  86 +       IPTABLES_VERSION);
  87 +       fputc('\n', stdout);
  88 +}
  89 +
  90 +static struct option opts[] = {
  91 +       { .name = "l7proto", .has_arg = 1, .flag = 0, .val = '1' },
  92 +       { .name = "l7dir",   .has_arg = 1, .flag = 0, .val = '2' },
  93 +       { .name = "l7pkt",   .has_arg = 0, .flag = 0, .val = '3' },
  94 +       { .name = 0 }
  95 +};
  96 +
  97 +/* reads filename, puts protocol info into layer7_protocol_info, number of protocols to numprotos */
  98 +int parse_protocol_file(char * filename, const unsigned char * protoname, struct ipt_layer7_info *info)
  99 +{
 100 +       FILE * f;
 101 +       char * line = NULL;
 102 +       size_t len = 0;
 103 +
 104 +       enum { protocol, pattern, done } datatype = protocol;
 105 +
 106 +       f = fopen(filename, "r");
 107 +
 108 +       if(!f)
 109 +               return 0;
 110 +
 111 +       while(getline(&line, &len, f) != -1)
 112 +       {
 113 +               if(strlen(line) < 2 || line[0] == '#')
 114 +                       continue;
 115 +
 116 +               /* strip the pesky newline... */
 117 +               if(line[strlen(line) - 1] == '\n')
 118 +                       line[strlen(line) - 1] = '\0';
 119 +
 120 +               if(datatype == protocol)
 121 +               {
 122 +                       if(strcmp(line, protoname))
 123 +                               exit_error(OTHER_PROBLEM,
 124 +                                       "Protocol name (%s) doesn't match file name (%s).  Bailing out\n",
 125 +                                       protoname, filename);
 126 +
 127 +                       if(strlen(line) >= MAX_PROTOCOL_LEN)
 128 +                                exit_error(PARAMETER_PROBLEM,
 129 +                                       "Protocol name in %s too long!", filename);
 130 +                       strncpy(info->protocol, line, MAX_PROTOCOL_LEN);
 131 +
 132 +                       datatype = pattern;
 133 +               }
 134 +               else if(datatype == pattern)
 135 +               {
 136 +                       if(strlen(line) >= MAX_PATTERN_LEN)
 137 +                                exit_error(PARAMETER_PROBLEM, "Pattern in %s too long!", filename);
 138 +                       strncpy(info->pattern, line, MAX_PATTERN_LEN);
 139 +
 140 +                       datatype = done;
 141 +                       break;
 142 +               }
 143 +               else
 144 +                       exit_error(OTHER_PROBLEM, "Internal error");
 145 +       }
 146 +
 147 +       if(datatype != done)
 148 +               exit_error(OTHER_PROBLEM, "Failed to get all needed data from %s", filename);
 149 +
 150 +       if(line) free(line);
 151 +       fclose(f);
 152 +
 153 +       return 1;
 154 +
 155 +/*
 156 +       fprintf(stderr, "protocol: %s\npattern: %s\n\n",
 157 +                       info->protocol,
 158 +                       info->pattern);
 159 +*/
 160 +}
 161 +
 162 +static int hex2dec(char c)
 163 +{
 164 +        switch (c)
 165 +        {
 166 +                case '0' ... '9':
 167 +                        return c - '0';
 168 +                case 'a' ... 'f':
 169 +                        return c - 'a' + 10;
 170 +                case 'A' ... 'F':
 171 +                        return c - 'A' + 10;
 172 +                default:
 173 +                        exit_error(OTHER_PROBLEM, "hex2dec: bad value!\n");
 174 +                        return 0;
 175 +        }
 176 +}
 177 +
 178 +/* takes a string with \xHH escapes and returns one with the characters
 179 +they stand for */
 180 +static char * pre_process(char * s)
 181 +{
 182 +       char * result = malloc(strlen(s) + 1);
 183 +       int sindex = 0, rindex = 0;
 184 +        while( sindex < strlen(s) )
 185 +        {
 186 +            if( sindex + 3 < strlen(s) &&
 187 +                s[sindex] == '\\' && s[sindex+1] == 'x' &&
 188 +                isxdigit(s[sindex + 2]) && isxdigit(s[sindex + 3]) )
 189 +                {
 190 +                        /* carefully remember to call tolower here... */
 191 +                        result[rindex] = tolower( hex2dec(s[sindex + 2])*16 +
 192 +                                                  hex2dec(s[sindex + 3] ) );
 193 +                        sindex += 3; /* 4 total */
 194 +                }
 195 +                else
 196 +                        result[rindex] = tolower(s[sindex]);
 197 +
 198 +               sindex++;
 199 +               rindex++;
 200 +        }
 201 +       result[rindex] = '\0';
 202 +
 203 +       return result;
 204 +}
 205 +
 206 +#define MAX_SUBDIRS 128
 207 +char ** readl7dir(char * dirname)
 208 +{
 209 +        DIR             * scratchdir;
 210 +        struct dirent   ** namelist;
 211 +       char ** subdirs = malloc(MAX_SUBDIRS * sizeof(char *));
 212 +
 213 +        int n, d = 1;
 214 +       subdirs[0] = "";
 215 +
 216 +        n = scandir(dirname, &namelist, 0, alphasort);
 217 +
 218 +       if (n < 0)
 219 +       {
 220 +            perror("scandir");
 221 +           exit_error(OTHER_PROBLEM, "Couldn't open %s\n", dirname);
 222 +       }
 223 +        else
 224 +       {
 225 +               while(n--)
 226 +               {
 227 +                       char fulldirname[MAX_FN_LEN];
 228 +
 229 +                       snprintf(fulldirname, MAX_FN_LEN, "%s/%s", dirname, namelist[n]->d_name);
 230 +
 231 +                       if((scratchdir = opendir(fulldirname)) != NULL)
 232 +                       {
 233 +                               closedir(scratchdir);
 234 +
 235 +                               if(!strcmp(namelist[n]->d_name, ".") ||
 236 +                                  !strcmp(namelist[n]->d_name, ".."))
 237 +                                       /* do nothing */ ;
 238 +                               else
 239 +                               {
 240 +                                       subdirs[d] = malloc(strlen(namelist[n]->d_name) + 1);
 241 +                                       strcpy(subdirs[d], namelist[n]->d_name);
 242 +                                       d++;
 243 +                                       if(d >= MAX_SUBDIRS - 1)
 244 +                                       {
 245 +                                               fprintf(stderr,
 246 +                                                 "Too many subdirectories, skipping the rest!\n");
 247 +                                               break;
 248 +                                       }
 249 +                               }
 250 +                       }
 251 +                       free(namelist[n]);
 252 +               }
 253 +               free(namelist);
 254 +        }
 255 +
 256 +       subdirs[d] = NULL;
 257 +
 258 +       return subdirs;
 259 +}
 260 +
 261 +static void
 262 +parse_layer7_protocol(const unsigned char *s, struct ipt_layer7_info *info)
 263 +{
 264 +       char filename[MAX_FN_LEN];
 265 +       char * dir = NULL;
 266 +       char ** subdirs;
 267 +       int n = 0, done = 0;
 268 +
 269 +       if(strlen(l7dir) > 0)
 270 +               dir = l7dir;
 271 +       else
 272 +               dir = "/etc/l7-protocols";
 273 +
 274 +       subdirs = readl7dir(dir);
 275 +
 276 +       while(subdirs[n] != NULL)
 277 +       {
 278 +               int c = snprintf(filename, MAX_FN_LEN, "%s/%s/%s.pat", dir, subdirs[n], s);
 279 +
 280 +               //fprintf(stderr, "Trying to find pattern in %s ... ", filename);
 281 +
 282 +               if(c > MAX_FN_LEN)
 283 +               {
 284 +                       exit_error(OTHER_PROBLEM,
 285 +                               "Filename beginning with %s is too long!\n", filename);
 286 +               }
 287 +
 288 +               /* read in the pattern from the file */
 289 +               if(parse_protocol_file(filename, s, info))
 290 +               {
 291 +                       //fprintf(stderr, "found\n");
 292 +                       done = 1;
 293 +                       break;
 294 +               }
 295 +
 296 +               //fprintf(stderr, "not found\n");
 297 +
 298 +               n++;
 299 +       }
 300 +
 301 +       if(!done)
 302 +               exit_error(OTHER_PROBLEM,
 303 +                       "Couldn't find a pattern definition file for %s.\n", s);
 304 +
 305 +       /* process \xHH escapes and tolower everything. (our regex lib has no
 306 +       case insensitivity option.) */
 307 +       strncpy(info->pattern, pre_process(info->pattern), MAX_PATTERN_LEN);
 308 +}
 309 +
 310 +/* Function which parses command options; returns true if it ate an option */
 311 +static int parse(int c, char **argv, int invert, unsigned int *flags,
 312 +      const struct ipt_entry *entry, unsigned int *nfcache,
 313 +      struct ipt_entry_match **match)
 314 +{
 315 +       struct ipt_layer7_info *layer7info =
 316 +               (struct ipt_layer7_info *)(*match)->data;
 317 +
 318 +       switch (c) {
 319 +       case '1':
 320 +               check_inverse(optarg, &invert, &optind, 0);
 321 +               parse_layer7_protocol(argv[optind-1], layer7info);
 322 +               if (invert)
 323 +                       layer7info->invert = 1;
 324 +               *flags = 1;
 325 +               break;
 326 +
 327 +       case '2':
 328 +               /* not going to use this, but maybe we need to strip a ! anyway (?) */
 329 +               check_inverse(optarg, &invert, &optind, 0);
 330 +
 331 +               if(strlen(argv[optind-1]) >= MAX_FN_LEN)
 332 +                       exit_error(PARAMETER_PROBLEM, "directory name too long\n");
 333 +
 334 +               strncpy(l7dir, argv[optind-1], MAX_FN_LEN);
 335 +
 336 +               *flags = 1;
 337 +               break;
 338 +       case '3':
 339 +               layer7info->pkt = 1;
 340 +               break;
 341 +
 342 +       default:
 343 +               return 0;
 344 +       }
 345 +
 346 +       return 1;
 347 +}
 348 +
 349 +/* Final check; must have specified --pattern. */
 350 +static void final_check(unsigned int flags)
 351 +{
 352 +       if (!flags)
 353 +               exit_error(PARAMETER_PROBLEM,
 354 +                          "LAYER7 match: You must specify `--pattern'");
 355 +}
 356 +
 357 +static void print_protocol(char s[], int invert, int numeric)
 358 +{
 359 +       fputs("l7proto ", stdout);
 360 +       if (invert) fputc('!', stdout);
 361 +       printf("%s ", s);
 362 +}
 363 +
 364 +/* Prints out the matchinfo. */
 365 +static void print(const struct ipt_ip *ip,
 366 +      const struct ipt_entry_match *match,
 367 +      int numeric)
 368 +{
 369 +       printf("LAYER7 ");
 370 +
 371 +       print_protocol(((struct ipt_layer7_info *)match->data)->protocol,
 372 +                 ((struct ipt_layer7_info *)match->data)->invert, numeric);
 373 +
 374 +       if (((struct ipt_layer7_info *)match->data)->pkt)
 375 +               printf("l7pkt ");
 376 +}
 377 +/* Saves the union ipt_matchinfo in parsable form to stdout. */
 378 +static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
 379 +{
 380 +        const struct ipt_layer7_info *info =
 381 +            (const struct ipt_layer7_info*) match->data;
 382 +
 383 +        printf("--l7proto %s%s ", (info->invert)   ? "! ": "", info->protocol);
 384 +}
 385 +
 386 +static struct iptables_match layer7 = {
 387 +    .name          = "layer7",
 388 +    .version       = IPTABLES_VERSION,
 389 +    .size          = IPT_ALIGN(sizeof(struct ipt_layer7_info)),
 390 +    .userspacesize = IPT_ALIGN(sizeof(struct ipt_layer7_info)),
 391 +    .help          = &help,
 392 +    .parse         = &parse,
 393 +    .final_check   = &final_check,
 394 +    .print         = &print,
 395 +    .save          = &save,
 396 +    .extra_opts    = opts
 397 +};
 398 +
 399 +void _init(void)
 400 +{
 401 +       register_match(&layer7);
 402 +}
 403 Index: iptables-1.3.7/extensions/libipt_layer7.man
 404 ===================================================================
 405 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 406 +++ iptables-1.3.7/extensions/libipt_layer7.man 2007-06-04 13:21:43.709331840 +0200
 407 @@ -0,0 +1,13 @@
 408 +This module matches packets based on the application layer data of
 409 +their connections.  It uses regular expression matching to compare
 410 +the application layer data to regular expressions found it the layer7
 411 +configuration files.  This is an experimental module which can be found at
 412 +http://l7-filter.sf.net.  It takes two options.
 413 +.TP
 414 +.BI "--l7proto " "\fIprotocol\fP"
 415 +Match the specified protocol.  The protocol name must match a file
 416 +name in /etc/l7-protocols/
 417 +.TP
 418 +.BI "--l7dir " "\fIdirectory\fP"
 419 +Use \fIdirectory\fP instead of /etc/l7-protocols/
 420 +