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

   1 Index: iptables-1.3.8/extensions/.layer7-test
   2 ===================================================================
   3 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
   4 +++ iptables-1.3.8/extensions/.layer7-test      2007-07-31 15:27:56.000000000 -0500
   5 @@ -0,0 +1,3 @@
   6 +#! /bin/sh
   7 +[ -f $KERNEL_DIR/include/linux/netfilter_ipv4/ipt_layer7.h ] && echo layer7
   8 +[ -f $KERNEL_DIR/include/linux/netfilter/xt_layer7.h ] && echo layer7
   9 Index: iptables-1.3.8/extensions/ipt_layer7.h
  10 ===================================================================
  11 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  12 +++ iptables-1.3.8/extensions/ipt_layer7.h      2007-07-31 15:27:56.000000000 -0500
  13 @@ -0,0 +1,27 @@
  14 +/*
  15 +  By Matthew Strait <quadong@users.sf.net>, Dec 2003.
  16 +  http://l7-filter.sf.net
  17 +
  18 +  This program is free software; you can redistribute it and/or
  19 +  modify it under the terms of the GNU General Public License
  20 +  as published by the Free Software Foundation; either version
  21 +  2 of the License, or (at your option) any later version.
  22 +  http://www.gnu.org/licenses/gpl.txt
  23 +*/
  24 +
  25 +#ifndef _IPT_LAYER7_H
  26 +#define _IPT_LAYER7_H
  27 +
  28 +#define MAX_PATTERN_LEN 8192
  29 +#define MAX_PROTOCOL_LEN 256
  30 +
  31 +typedef char *(*proc_ipt_search) (char *, char, char *);
  32 +
  33 +struct ipt_layer7_info {
  34 +    char protocol[MAX_PROTOCOL_LEN];
  35 +    char invert:1;
  36 +    char pattern[MAX_PATTERN_LEN];
  37 +       char pkt;
  38 +};
  39 +
  40 +#endif /* _IPT_LAYER7_H */
  41 Index: iptables-1.3.8/extensions/libipt_layer7.c
  42 ===================================================================
  43 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
  44 +++ iptables-1.3.8/extensions/libipt_layer7.c   2007-07-31 15:27:56.000000000 -0500
  45 @@ -0,0 +1,358 @@
  46 +/*
  47 +   Shared library add-on to iptables to add layer 7 matching support.
  48 +
  49 +   By Matthew Strait <quadong@users.sf.net>, Oct 2003.
  50 +
  51 +   http://l7-filter.sf.net
  52 +
  53 +   This program is free software; you can redistribute it and/or
  54 +   modify it under the terms of the GNU General Public License
  55 +   as published by the Free Software Foundation; either version
  56 +   2 of the License, or (at your option) any later version.
  57 +   http://www.gnu.org/licenses/gpl.txt
  58 +
  59 +   Based on libipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>
  60 +*/
  61 +
  62 +#define _GNU_SOURCE
  63 +#include <stdio.h>
  64 +#include <netdb.h>
  65 +#include <string.h>
  66 +#include <stdlib.h>
  67 +#include <getopt.h>
  68 +#include <ctype.h>
  69 +#include <dirent.h>
  70 +
  71 +#include <iptables.h>
  72 +#include "ipt_layer7.h"
  73 +
  74 +#define MAX_FN_LEN 256
  75 +
  76 +static char l7dir[MAX_FN_LEN] = "\0";
  77 +
  78 +/* Function which prints out usage message. */
  79 +static void help(void)
  80 +{
  81 +       printf(
  82 +       "LAYER7 match v%s options:\n"
  83 +       "--l7dir <directory>  : Look for patterns here instead of /etc/l7-protocols/\n"
  84 +       "                       (--l7dir must be specified before --l7proto if used!)\n"
  85 +       "--l7proto [!] <name> : Match the protocol defined in /etc/l7-protocols/name.pat\n"
  86 +       "--l7pkt              : Skip connection tracking and match individual packets\n",
  87 +       IPTABLES_VERSION);
  88 +       fputc('\n', stdout);
  89 +}
  90 +
  91 +static struct option opts[] = {
  92 +       { .name = "l7proto", .has_arg = 1, .flag = 0, .val = '1' },
  93 +       { .name = "l7dir",   .has_arg = 1, .flag = 0, .val = '2' },
  94 +       { .name = "l7pkt",   .has_arg = 0, .flag = 0, .val = '3' },
  95 +       { .name = 0 }
  96 +};
  97 +
  98 +/* reads filename, puts protocol info into layer7_protocol_info, number of protocols to numprotos */
  99 +int parse_protocol_file(char * filename, const unsigned char * protoname, struct ipt_layer7_info *info)
 100 +{
 101 +       FILE * f;
 102 +       char * line = NULL;
 103 +       size_t len = 0;
 104 +
 105 +       enum { protocol, pattern, done } datatype = protocol;
 106 +
 107 +       f = fopen(filename, "r");
 108 +
 109 +       if(!f)
 110 +               return 0;
 111 +
 112 +       while(getline(&line, &len, f) != -1)
 113 +       {
 114 +               if(strlen(line) < 2 || line[0] == '#')
 115 +                       continue;
 116 +
 117 +               /* strip the pesky newline... */
 118 +               if(line[strlen(line) - 1] == '\n')
 119 +                       line[strlen(line) - 1] = '\0';
 120 +
 121 +               if(datatype == protocol)
 122 +               {
 123 +                       if(strcmp(line, protoname))
 124 +                               exit_error(OTHER_PROBLEM,
 125 +                                       "Protocol name (%s) doesn't match file name (%s).  Bailing out\n",
 126 +                                       protoname, filename);
 127 +
 128 +                       if(strlen(line) >= MAX_PROTOCOL_LEN)
 129 +                                exit_error(PARAMETER_PROBLEM,
 130 +                                       "Protocol name in %s too long!", filename);
 131 +                       strncpy(info->protocol, line, MAX_PROTOCOL_LEN);
 132 +
 133 +                       datatype = pattern;
 134 +               }
 135 +               else if(datatype == pattern)
 136 +               {
 137 +                       if(strlen(line) >= MAX_PATTERN_LEN)
 138 +                                exit_error(PARAMETER_PROBLEM, "Pattern in %s too long!", filename);
 139 +                       strncpy(info->pattern, line, MAX_PATTERN_LEN);
 140 +
 141 +                       datatype = done;
 142 +                       break;
 143 +               }
 144 +               else
 145 +                       exit_error(OTHER_PROBLEM, "Internal error");
 146 +       }
 147 +
 148 +       if(datatype != done)
 149 +               exit_error(OTHER_PROBLEM, "Failed to get all needed data from %s", filename);
 150 +
 151 +       if(line) free(line);
 152 +       fclose(f);
 153 +
 154 +       return 1;
 155 +
 156 +/*
 157 +       fprintf(stderr, "protocol: %s\npattern: %s\n\n",
 158 +                       info->protocol,
 159 +                       info->pattern);
 160 +*/
 161 +}
 162 +
 163 +static int hex2dec(char c)
 164 +{
 165 +        switch (c)
 166 +        {
 167 +                case '0' ... '9':
 168 +                        return c - '0';
 169 +                case 'a' ... 'f':
 170 +                        return c - 'a' + 10;
 171 +                case 'A' ... 'F':
 172 +                        return c - 'A' + 10;
 173 +                default:
 174 +                        exit_error(OTHER_PROBLEM, "hex2dec: bad value!\n");
 175 +                        return 0;
 176 +        }
 177 +}
 178 +
 179 +/* takes a string with \xHH escapes and returns one with the characters
 180 +they stand for */
 181 +static char * pre_process(char * s)
 182 +{
 183 +       char * result = malloc(strlen(s) + 1);
 184 +       int sindex = 0, rindex = 0;
 185 +        while( sindex < strlen(s) )
 186 +        {
 187 +            if( sindex + 3 < strlen(s) &&
 188 +                s[sindex] == '\\' && s[sindex+1] == 'x' &&
 189 +                isxdigit(s[sindex + 2]) && isxdigit(s[sindex + 3]) )
 190 +                {
 191 +                        /* carefully remember to call tolower here... */
 192 +                        result[rindex] = tolower( hex2dec(s[sindex + 2])*16 +
 193 +                                                  hex2dec(s[sindex + 3] ) );
 194 +                        sindex += 3; /* 4 total */
 195 +                }
 196 +                else
 197 +                        result[rindex] = tolower(s[sindex]);
 198 +
 199 +               sindex++;
 200 +               rindex++;
 201 +        }
 202 +       result[rindex] = '\0';
 203 +
 204 +       return result;
 205 +}
 206 +
 207 +#define MAX_SUBDIRS 128
 208 +char ** readl7dir(char * dirname)
 209 +{
 210 +        DIR             * scratchdir;
 211 +        struct dirent   ** namelist;
 212 +       char ** subdirs = malloc(MAX_SUBDIRS * sizeof(char *));
 213 +
 214 +        int n, d = 1;
 215 +       subdirs[0] = "";
 216 +
 217 +        n = scandir(dirname, &namelist, 0, alphasort);
 218 +
 219 +       if (n < 0)
 220 +       {
 221 +            perror("scandir");
 222 +           exit_error(OTHER_PROBLEM, "Couldn't open %s\n", dirname);
 223 +       }
 224 +        else
 225 +       {
 226 +               while(n--)
 227 +               {
 228 +                       char fulldirname[MAX_FN_LEN];
 229 +
 230 +                       snprintf(fulldirname, MAX_FN_LEN, "%s/%s", dirname, namelist[n]->d_name);
 231 +
 232 +                       if((scratchdir = opendir(fulldirname)) != NULL)
 233 +                       {
 234 +                               closedir(scratchdir);
 235 +
 236 +                               if(!strcmp(namelist[n]->d_name, ".") ||
 237 +                                  !strcmp(namelist[n]->d_name, ".."))
 238 +                                       /* do nothing */ ;
 239 +                               else
 240 +                               {
 241 +                                       subdirs[d] = malloc(strlen(namelist[n]->d_name) + 1);
 242 +                                       strcpy(subdirs[d], namelist[n]->d_name);
 243 +                                       d++;
 244 +                                       if(d >= MAX_SUBDIRS - 1)
 245 +                                       {
 246 +                                               fprintf(stderr,
 247 +                                                 "Too many subdirectories, skipping the rest!\n");
 248 +                                               break;
 249 +                                       }
 250 +                               }
 251 +                       }
 252 +                       free(namelist[n]);
 253 +               }
 254 +               free(namelist);
 255 +        }
 256 +
 257 +       subdirs[d] = NULL;
 258 +
 259 +       return subdirs;
 260 +}
 261 +
 262 +static void
 263 +parse_layer7_protocol(const unsigned char *s, struct ipt_layer7_info *info)
 264 +{
 265 +       char filename[MAX_FN_LEN];
 266 +       char * dir = NULL;
 267 +       char ** subdirs;
 268 +       int n = 0, done = 0;
 269 +
 270 +       if(strlen(l7dir) > 0)
 271 +               dir = l7dir;
 272 +       else
 273 +               dir = "/etc/l7-protocols";
 274 +
 275 +       subdirs = readl7dir(dir);
 276 +
 277 +       while(subdirs[n] != NULL)
 278 +       {
 279 +               int c = snprintf(filename, MAX_FN_LEN, "%s/%s/%s.pat", dir, subdirs[n], s);
 280 +
 281 +               //fprintf(stderr, "Trying to find pattern in %s ... ", filename);
 282 +
 283 +               if(c > MAX_FN_LEN)
 284 +               {
 285 +                       exit_error(OTHER_PROBLEM,
 286 +                               "Filename beginning with %s is too long!\n", filename);
 287 +               }
 288 +
 289 +               /* read in the pattern from the file */
 290 +               if(parse_protocol_file(filename, s, info))
 291 +               {
 292 +                       //fprintf(stderr, "found\n");
 293 +                       done = 1;
 294 +                       break;
 295 +               }
 296 +
 297 +               //fprintf(stderr, "not found\n");
 298 +
 299 +               n++;
 300 +       }
 301 +
 302 +       if(!done)
 303 +               exit_error(OTHER_PROBLEM,
 304 +                       "Couldn't find a pattern definition file for %s.\n", s);
 305 +
 306 +       /* process \xHH escapes and tolower everything. (our regex lib has no
 307 +       case insensitivity option.) */
 308 +       strncpy(info->pattern, pre_process(info->pattern), MAX_PATTERN_LEN);
 309 +}
 310 +
 311 +/* Function which parses command options; returns true if it ate an option */
 312 +static int parse(int c, char **argv, int invert, unsigned int *flags,
 313 +      const struct ipt_entry *entry, unsigned int *nfcache,
 314 +      struct ipt_entry_match **match)
 315 +{
 316 +       struct ipt_layer7_info *layer7info =
 317 +               (struct ipt_layer7_info *)(*match)->data;
 318 +
 319 +       switch (c) {
 320 +       case '1':
 321 +               check_inverse(optarg, &invert, &optind, 0);
 322 +               parse_layer7_protocol(argv[optind-1], layer7info);
 323 +               if (invert)
 324 +                       layer7info->invert = 1;
 325 +               *flags = 1;
 326 +               break;
 327 +
 328 +       case '2':
 329 +               /* not going to use this, but maybe we need to strip a ! anyway (?) */
 330 +               check_inverse(optarg, &invert, &optind, 0);
 331 +
 332 +               if(strlen(argv[optind-1]) >= MAX_FN_LEN)
 333 +                       exit_error(PARAMETER_PROBLEM, "directory name too long\n");
 334 +
 335 +               strncpy(l7dir, argv[optind-1], MAX_FN_LEN);
 336 +
 337 +               *flags = 1;
 338 +               break;
 339 +       case '3':
 340 +               layer7info->pkt = 1;
 341 +               break;
 342 +
 343 +       default:
 344 +               return 0;
 345 +       }
 346 +
 347 +       return 1;
 348 +}
 349 +
 350 +/* Final check; must have specified --pattern. */
 351 +static void final_check(unsigned int flags)
 352 +{
 353 +       if (!flags)
 354 +               exit_error(PARAMETER_PROBLEM,
 355 +                          "LAYER7 match: You must specify `--pattern'");
 356 +}
 357 +
 358 +static void print_protocol(char s[], int invert, int numeric)
 359 +{
 360 +       fputs("l7proto ", stdout);
 361 +       if (invert) fputc('!', stdout);
 362 +       printf("%s ", s);
 363 +}
 364 +
 365 +/* Prints out the matchinfo. */
 366 +static void print(const struct ipt_ip *ip,
 367 +      const struct ipt_entry_match *match,
 368 +      int numeric)
 369 +{
 370 +       printf("LAYER7 ");
 371 +
 372 +       print_protocol(((struct ipt_layer7_info *)match->data)->protocol,
 373 +                 ((struct ipt_layer7_info *)match->data)->invert, numeric);
 374 +
 375 +       if (((struct ipt_layer7_info *)match->data)->pkt)
 376 +               printf("l7pkt ");
 377 +}
 378 +/* Saves the union ipt_matchinfo in parsable form to stdout. */
 379 +static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
 380 +{
 381 +        const struct ipt_layer7_info *info =
 382 +            (const struct ipt_layer7_info*) match->data;
 383 +
 384 +        printf("--l7proto %s%s ", (info->invert)   ? "! ": "", info->protocol);
 385 +}
 386 +
 387 +static struct iptables_match layer7 = {
 388 +    .name          = "layer7",
 389 +    .version       = IPTABLES_VERSION,
 390 +    .size          = IPT_ALIGN(sizeof(struct ipt_layer7_info)),
 391 +    .userspacesize = IPT_ALIGN(sizeof(struct ipt_layer7_info)),
 392 +    .help          = &help,
 393 +    .parse         = &parse,
 394 +    .final_check   = &final_check,
 395 +    .print         = &print,
 396 +    .save          = &save,
 397 +    .extra_opts    = opts
 398 +};
 399 +
 400 +void _init(void)
 401 +{
 402 +       register_match(&layer7);
 403 +}
 404 Index: iptables-1.3.8/extensions/libipt_layer7.man
 405 ===================================================================
 406 --- /dev/null   1970-01-01 00:00:00.000000000 +0000
 407 +++ iptables-1.3.8/extensions/libipt_layer7.man 2007-07-31 15:27:56.000000000 -0500
 408 @@ -0,0 +1,13 @@
 409 +This module matches packets based on the application layer data of
 410 +their connections.  It uses regular expression matching to compare
 411 +the application layer data to regular expressions found it the layer7
 412 +configuration files.  This is an experimental module which can be found at
 413 +http://l7-filter.sf.net.  It takes two options.
 414 +.TP
 415 +.BI "--l7proto " "\fIprotocol\fP"
 416 +Match the specified protocol.  The protocol name must match a file
 417 +name in /etc/l7-protocols/
 418 +.TP
 419 +.BI "--l7dir " "\fIdirectory\fP"
 420 +Use \fIdirectory\fP instead of /etc/l7-protocols/
 421 +