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1109 lines
27 KiB
C
1109 lines
27 KiB
C
/* $OpenBSD: pfctl_osfp.c,v 1.14 2006/04/08 02:13:14 ray Exp $ */
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/*
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* Copyright (c) 2003 Mike Frantzen <frantzen@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/pfvar.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "pfctl_parser.h"
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#include "pfctl.h"
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#ifndef MIN
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# define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#endif /* MIN */
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#ifndef MAX
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# define MAX(a,b) (((a) > (b)) ? (a) : (b))
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#endif /* MAX */
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#if 0
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# define DEBUG(fp, str, v...) \
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fprintf(stderr, "%s:%s:%s " str "\n", (fp)->fp_os.fp_class_nm, \
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(fp)->fp_os.fp_version_nm, (fp)->fp_os.fp_subtype_nm , ## v);
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#else
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# define DEBUG(fp, str, v...) ((void)0)
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#endif
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struct name_entry;
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LIST_HEAD(name_list, name_entry);
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struct name_entry {
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LIST_ENTRY(name_entry) nm_entry;
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int nm_num;
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char nm_name[PF_OSFP_LEN];
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struct name_list nm_sublist;
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int nm_sublist_num;
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};
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static struct name_list classes = LIST_HEAD_INITIALIZER(&classes);
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static int class_count;
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static int fingerprint_count;
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void add_fingerprint(int, int, struct pf_osfp_ioctl *);
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struct name_entry *fingerprint_name_entry(struct name_list *, char *);
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void pfctl_flush_my_fingerprints(struct name_list *);
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char *get_field(char **, size_t *, int *);
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int get_int(char **, size_t *, int *, int *, const char *,
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int, int, const char *, int);
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int get_str(char **, size_t *, char **, const char *, int,
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const char *, int);
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int get_tcpopts(const char *, int, const char *,
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pf_tcpopts_t *, int *, int *, int *, int *, int *,
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int *);
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void import_fingerprint(struct pf_osfp_ioctl *);
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const char *print_ioctl(struct pf_osfp_ioctl *);
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void print_name_list(int, struct name_list *, const char *);
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void sort_name_list(int, struct name_list *);
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struct name_entry *lookup_name_list(struct name_list *, const char *);
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/* Load fingerprints from a file */
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int
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pfctl_file_fingerprints(int dev, int opts, const char *fp_filename)
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{
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FILE *in;
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char *line;
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size_t len;
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int i, lineno = 0;
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int window, w_mod, ttl, df, psize, p_mod, mss, mss_mod, wscale,
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wscale_mod, optcnt, ts0;
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pf_tcpopts_t packed_tcpopts;
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char *class, *version, *subtype, *desc, *tcpopts;
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struct pf_osfp_ioctl fp;
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pfctl_flush_my_fingerprints(&classes);
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if ((in = pfctl_fopen(fp_filename, "r")) == NULL) {
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warn("%s", fp_filename);
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return (1);
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}
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class = version = subtype = desc = tcpopts = NULL;
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if ((opts & PF_OPT_NOACTION) == 0)
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pfctl_clear_fingerprints(dev, opts);
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while ((line = fgetln(in, &len)) != NULL) {
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lineno++;
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if (class)
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free(class);
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if (version)
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free(version);
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if (subtype)
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free(subtype);
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if (desc)
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free(desc);
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if (tcpopts)
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free(tcpopts);
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class = version = subtype = desc = tcpopts = NULL;
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memset(&fp, 0, sizeof(fp));
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/* Chop off comment */
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for (i = 0; i < len; i++)
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if (line[i] == '#') {
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len = i;
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break;
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}
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/* Chop off whitespace */
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while (len > 0 && isspace(line[len - 1]))
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len--;
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while (len > 0 && isspace(line[0])) {
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len--;
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line++;
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}
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if (len == 0)
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continue;
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#define T_DC 0x01 /* Allow don't care */
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#define T_MSS 0x02 /* Allow MSS multiple */
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#define T_MTU 0x04 /* Allow MTU multiple */
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#define T_MOD 0x08 /* Allow modulus */
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#define GET_INT(v, mod, n, ty, mx) \
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get_int(&line, &len, &v, mod, n, ty, mx, fp_filename, lineno)
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#define GET_STR(v, n, mn) \
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get_str(&line, &len, &v, n, mn, fp_filename, lineno)
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if (GET_INT(window, &w_mod, "window size", T_DC|T_MSS|T_MTU|
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T_MOD, 0xffff) ||
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GET_INT(ttl, NULL, "ttl", 0, 0xff) ||
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GET_INT(df, NULL, "don't fragment frag", 0, 1) ||
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GET_INT(psize, &p_mod, "overall packet size", T_MOD|T_DC,
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8192) ||
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GET_STR(tcpopts, "TCP Options", 1) ||
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GET_STR(class, "OS class", 1) ||
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GET_STR(version, "OS version", 0) ||
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GET_STR(subtype, "OS subtype", 0) ||
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GET_STR(desc, "OS description", 2))
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continue;
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if (get_tcpopts(fp_filename, lineno, tcpopts, &packed_tcpopts,
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&optcnt, &mss, &mss_mod, &wscale, &wscale_mod, &ts0))
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continue;
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if (len != 0) {
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fprintf(stderr, "%s:%d excess field\n", fp_filename,
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lineno);
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continue;
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}
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fp.fp_ttl = ttl;
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if (df)
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fp.fp_flags |= PF_OSFP_DF;
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switch (w_mod) {
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case 0:
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break;
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case T_DC:
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fp.fp_flags |= PF_OSFP_WSIZE_DC;
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break;
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case T_MSS:
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fp.fp_flags |= PF_OSFP_WSIZE_MSS;
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break;
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case T_MTU:
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fp.fp_flags |= PF_OSFP_WSIZE_MTU;
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break;
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case T_MOD:
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fp.fp_flags |= PF_OSFP_WSIZE_MOD;
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break;
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}
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fp.fp_wsize = window;
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switch (p_mod) {
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case T_DC:
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fp.fp_flags |= PF_OSFP_PSIZE_DC;
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break;
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case T_MOD:
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fp.fp_flags |= PF_OSFP_PSIZE_MOD;
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}
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fp.fp_psize = psize;
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switch (wscale_mod) {
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case T_DC:
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fp.fp_flags |= PF_OSFP_WSCALE_DC;
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break;
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case T_MOD:
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fp.fp_flags |= PF_OSFP_WSCALE_MOD;
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}
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fp.fp_wscale = wscale;
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switch (mss_mod) {
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case T_DC:
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fp.fp_flags |= PF_OSFP_MSS_DC;
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break;
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case T_MOD:
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fp.fp_flags |= PF_OSFP_MSS_MOD;
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break;
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}
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fp.fp_mss = mss;
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fp.fp_tcpopts = packed_tcpopts;
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fp.fp_optcnt = optcnt;
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if (ts0)
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fp.fp_flags |= PF_OSFP_TS0;
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if (class[0] == '@')
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fp.fp_os.fp_enflags |= PF_OSFP_GENERIC;
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if (class[0] == '*')
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fp.fp_os.fp_enflags |= PF_OSFP_NODETAIL;
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if (class[0] == '@' || class[0] == '*')
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strlcpy(fp.fp_os.fp_class_nm, class + 1,
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sizeof(fp.fp_os.fp_class_nm));
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else
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strlcpy(fp.fp_os.fp_class_nm, class,
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sizeof(fp.fp_os.fp_class_nm));
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strlcpy(fp.fp_os.fp_version_nm, version,
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sizeof(fp.fp_os.fp_version_nm));
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strlcpy(fp.fp_os.fp_subtype_nm, subtype,
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sizeof(fp.fp_os.fp_subtype_nm));
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add_fingerprint(dev, opts, &fp);
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fp.fp_flags |= (PF_OSFP_DF | PF_OSFP_INET6);
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fp.fp_psize += sizeof(struct ip6_hdr) - sizeof(struct ip);
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add_fingerprint(dev, opts, &fp);
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}
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if (class)
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free(class);
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if (version)
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free(version);
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if (subtype)
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free(subtype);
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if (desc)
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free(desc);
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if (tcpopts)
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free(tcpopts);
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fclose(in);
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if (opts & PF_OPT_VERBOSE2)
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printf("Loaded %d passive OS fingerprints\n",
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fingerprint_count);
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return (0);
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}
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/* flush the kernel's fingerprints */
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void
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pfctl_clear_fingerprints(int dev, int opts)
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{
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if (ioctl(dev, DIOCOSFPFLUSH))
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err(1, "DIOCOSFPFLUSH");
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}
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/* flush pfctl's view of the fingerprints */
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void
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pfctl_flush_my_fingerprints(struct name_list *list)
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{
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struct name_entry *nm;
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while ((nm = LIST_FIRST(list)) != NULL) {
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LIST_REMOVE(nm, nm_entry);
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pfctl_flush_my_fingerprints(&nm->nm_sublist);
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free(nm);
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}
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fingerprint_count = 0;
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class_count = 0;
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}
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/* Fetch the active fingerprints from the kernel */
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int
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pfctl_load_fingerprints(int dev, int opts)
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{
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struct pf_osfp_ioctl io;
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int i;
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pfctl_flush_my_fingerprints(&classes);
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for (i = 0; i >= 0; i++) {
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memset(&io, 0, sizeof(io));
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io.fp_getnum = i;
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if (ioctl(dev, DIOCOSFPGET, &io)) {
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if (errno == EBUSY)
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break;
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warn("DIOCOSFPGET");
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return (1);
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}
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import_fingerprint(&io);
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}
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return (0);
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}
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/* List the fingerprints */
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void
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pfctl_show_fingerprints(int opts)
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{
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if (LIST_FIRST(&classes) != NULL) {
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if (opts & PF_OPT_SHOWALL) {
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pfctl_print_title("OS FINGERPRINTS:");
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printf("%u fingerprints loaded\n", fingerprint_count);
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} else {
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printf("Class\tVersion\tSubtype(subversion)\n");
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printf("-----\t-------\t-------------------\n");
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sort_name_list(opts, &classes);
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print_name_list(opts, &classes, "");
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}
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}
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}
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/* Lookup a fingerprint */
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pf_osfp_t
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pfctl_get_fingerprint(const char *name)
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{
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struct name_entry *nm, *class_nm, *version_nm, *subtype_nm;
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pf_osfp_t ret = PF_OSFP_NOMATCH;
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int class, version, subtype;
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int unp_class, unp_version, unp_subtype;
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int wr_len, version_len, subtype_len;
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char *ptr, *wr_name;
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if (strcasecmp(name, "unknown") == 0)
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return (PF_OSFP_UNKNOWN);
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/* Try most likely no version and no subtype */
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if ((nm = lookup_name_list(&classes, name))) {
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class = nm->nm_num;
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version = PF_OSFP_ANY;
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subtype = PF_OSFP_ANY;
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goto found;
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} else {
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/* Chop it up into class/version/subtype */
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if ((wr_name = strdup(name)) == NULL)
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err(1, "malloc");
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if ((ptr = strchr(wr_name, ' ')) == NULL) {
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free(wr_name);
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return (PF_OSFP_NOMATCH);
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}
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*ptr++ = '\0';
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|
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/* The class is easy to find since it is delimited by a space */
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if ((class_nm = lookup_name_list(&classes, wr_name)) == NULL) {
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free(wr_name);
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return (PF_OSFP_NOMATCH);
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}
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class = class_nm->nm_num;
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|
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/* Try no subtype */
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if ((version_nm = lookup_name_list(&class_nm->nm_sublist, ptr)))
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{
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version = version_nm->nm_num;
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subtype = PF_OSFP_ANY;
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free(wr_name);
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goto found;
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}
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|
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/*
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* There must be a version and a subtype.
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* We'll do some fuzzy matching to pick up things like:
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* Linux 2.2.14 (version=2.2 subtype=14)
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* FreeBSD 4.0-STABLE (version=4.0 subtype=STABLE)
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* Windows 2000 SP2 (version=2000 subtype=SP2)
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*/
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#define CONNECTOR(x) ((x) == '.' || (x) == ' ' || (x) == '\t' || (x) == '-')
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wr_len = strlen(ptr);
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LIST_FOREACH(version_nm, &class_nm->nm_sublist, nm_entry) {
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version_len = strlen(version_nm->nm_name);
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if (wr_len < version_len + 2 ||
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!CONNECTOR(ptr[version_len]))
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continue;
|
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/* first part of the string must be version */
|
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if (strncasecmp(ptr, version_nm->nm_name,
|
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version_len))
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continue;
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LIST_FOREACH(subtype_nm, &version_nm->nm_sublist,
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nm_entry) {
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subtype_len = strlen(subtype_nm->nm_name);
|
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if (wr_len != version_len + subtype_len + 1)
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continue;
|
|
|
|
/* last part of the string must be subtype */
|
|
if (strcasecmp(&ptr[version_len+1],
|
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subtype_nm->nm_name) != 0)
|
|
continue;
|
|
|
|
/* Found it!! */
|
|
version = version_nm->nm_num;
|
|
subtype = subtype_nm->nm_num;
|
|
free(wr_name);
|
|
goto found;
|
|
}
|
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}
|
|
|
|
free(wr_name);
|
|
return (PF_OSFP_NOMATCH);
|
|
}
|
|
|
|
found:
|
|
PF_OSFP_PACK(ret, class, version, subtype);
|
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if (ret != PF_OSFP_NOMATCH) {
|
|
PF_OSFP_UNPACK(ret, unp_class, unp_version, unp_subtype);
|
|
if (class != unp_class) {
|
|
fprintf(stderr, "warning: fingerprint table overflowed "
|
|
"classes\n");
|
|
return (PF_OSFP_NOMATCH);
|
|
}
|
|
if (version != unp_version) {
|
|
fprintf(stderr, "warning: fingerprint table overflowed "
|
|
"versions\n");
|
|
return (PF_OSFP_NOMATCH);
|
|
}
|
|
if (subtype != unp_subtype) {
|
|
fprintf(stderr, "warning: fingerprint table overflowed "
|
|
"subtypes\n");
|
|
return (PF_OSFP_NOMATCH);
|
|
}
|
|
}
|
|
if (ret == PF_OSFP_ANY) {
|
|
/* should never happen */
|
|
fprintf(stderr, "warning: fingerprint packed to 'any'\n");
|
|
return (PF_OSFP_NOMATCH);
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/* Lookup a fingerprint name by ID */
|
|
char *
|
|
pfctl_lookup_fingerprint(pf_osfp_t fp, char *buf, size_t len)
|
|
{
|
|
int class, version, subtype;
|
|
struct name_list *list;
|
|
struct name_entry *nm;
|
|
|
|
char *class_name, *version_name, *subtype_name;
|
|
class_name = version_name = subtype_name = NULL;
|
|
|
|
if (fp == PF_OSFP_UNKNOWN) {
|
|
strlcpy(buf, "unknown", len);
|
|
return (buf);
|
|
}
|
|
if (fp == PF_OSFP_ANY) {
|
|
strlcpy(buf, "any", len);
|
|
return (buf);
|
|
}
|
|
|
|
PF_OSFP_UNPACK(fp, class, version, subtype);
|
|
if (class >= (1 << _FP_CLASS_BITS) ||
|
|
version >= (1 << _FP_VERSION_BITS) ||
|
|
subtype >= (1 << _FP_SUBTYPE_BITS)) {
|
|
warnx("PF_OSFP_UNPACK(0x%x) failed!!", fp);
|
|
strlcpy(buf, "nomatch", len);
|
|
return (buf);
|
|
}
|
|
|
|
LIST_FOREACH(nm, &classes, nm_entry) {
|
|
if (nm->nm_num == class) {
|
|
class_name = nm->nm_name;
|
|
if (version == PF_OSFP_ANY)
|
|
goto found;
|
|
list = &nm->nm_sublist;
|
|
LIST_FOREACH(nm, list, nm_entry) {
|
|
if (nm->nm_num == version) {
|
|
version_name = nm->nm_name;
|
|
if (subtype == PF_OSFP_ANY)
|
|
goto found;
|
|
list = &nm->nm_sublist;
|
|
LIST_FOREACH(nm, list, nm_entry) {
|
|
if (nm->nm_num == subtype) {
|
|
subtype_name =
|
|
nm->nm_name;
|
|
goto found;
|
|
}
|
|
} /* foreach subtype */
|
|
strlcpy(buf, "nomatch", len);
|
|
return (buf);
|
|
}
|
|
} /* foreach version */
|
|
strlcpy(buf, "nomatch", len);
|
|
return (buf);
|
|
}
|
|
} /* foreach class */
|
|
|
|
strlcpy(buf, "nomatch", len);
|
|
return (buf);
|
|
|
|
found:
|
|
snprintf(buf, len, "%s", class_name);
|
|
if (version_name) {
|
|
strlcat(buf, " ", len);
|
|
strlcat(buf, version_name, len);
|
|
if (subtype_name) {
|
|
if (strchr(version_name, ' '))
|
|
strlcat(buf, " ", len);
|
|
else if (strchr(version_name, '.') &&
|
|
isdigit(*subtype_name))
|
|
strlcat(buf, ".", len);
|
|
else
|
|
strlcat(buf, " ", len);
|
|
strlcat(buf, subtype_name, len);
|
|
}
|
|
}
|
|
return (buf);
|
|
}
|
|
|
|
/* lookup a name in a list */
|
|
struct name_entry *
|
|
lookup_name_list(struct name_list *list, const char *name)
|
|
{
|
|
struct name_entry *nm;
|
|
LIST_FOREACH(nm, list, nm_entry)
|
|
if (strcasecmp(name, nm->nm_name) == 0)
|
|
return (nm);
|
|
|
|
return (NULL);
|
|
}
|
|
|
|
|
|
void
|
|
add_fingerprint(int dev, int opts, struct pf_osfp_ioctl *fp)
|
|
{
|
|
struct pf_osfp_ioctl fptmp;
|
|
struct name_entry *nm_class, *nm_version, *nm_subtype;
|
|
int class, version, subtype;
|
|
|
|
/* We expand #-# or #.#-#.# version/subtypes into multiple fingerprints */
|
|
#define EXPAND(field) do { \
|
|
int _dot = -1, _start = -1, _end = -1, _i = 0; \
|
|
/* pick major version out of #.# */ \
|
|
if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.') { \
|
|
_dot = fp->field[_i] - '0'; \
|
|
_i += 2; \
|
|
} \
|
|
if (isdigit(fp->field[_i])) \
|
|
_start = fp->field[_i++] - '0'; \
|
|
else \
|
|
break; \
|
|
if (isdigit(fp->field[_i])) \
|
|
_start = (_start * 10) + fp->field[_i++] - '0'; \
|
|
if (fp->field[_i++] != '-') \
|
|
break; \
|
|
if (isdigit(fp->field[_i]) && fp->field[_i+1] == '.' && \
|
|
fp->field[_i] - '0' == _dot) \
|
|
_i += 2; \
|
|
else if (_dot != -1) \
|
|
break; \
|
|
if (isdigit(fp->field[_i])) \
|
|
_end = fp->field[_i++] - '0'; \
|
|
else \
|
|
break; \
|
|
if (isdigit(fp->field[_i])) \
|
|
_end = (_end * 10) + fp->field[_i++] - '0'; \
|
|
if (isdigit(fp->field[_i])) \
|
|
_end = (_end * 10) + fp->field[_i++] - '0'; \
|
|
if (fp->field[_i] != '\0') \
|
|
break; \
|
|
memcpy(&fptmp, fp, sizeof(fptmp)); \
|
|
for (;_start <= _end; _start++) { \
|
|
memset(fptmp.field, 0, sizeof(fptmp.field)); \
|
|
fptmp.fp_os.fp_enflags |= PF_OSFP_EXPANDED; \
|
|
if (_dot == -1) \
|
|
snprintf(fptmp.field, sizeof(fptmp.field), \
|
|
"%d", _start); \
|
|
else \
|
|
snprintf(fptmp.field, sizeof(fptmp.field), \
|
|
"%d.%d", _dot, _start); \
|
|
add_fingerprint(dev, opts, &fptmp); \
|
|
} \
|
|
} while(0)
|
|
|
|
/* We allow "#-#" as a version or subtype and we'll expand it */
|
|
EXPAND(fp_os.fp_version_nm);
|
|
EXPAND(fp_os.fp_subtype_nm);
|
|
|
|
if (strcasecmp(fp->fp_os.fp_class_nm, "nomatch") == 0)
|
|
errx(1, "fingerprint class \"nomatch\" is reserved");
|
|
|
|
version = PF_OSFP_ANY;
|
|
subtype = PF_OSFP_ANY;
|
|
|
|
nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
|
|
if (nm_class->nm_num == 0)
|
|
nm_class->nm_num = ++class_count;
|
|
class = nm_class->nm_num;
|
|
|
|
nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
|
|
fp->fp_os.fp_version_nm);
|
|
if (nm_version) {
|
|
if (nm_version->nm_num == 0)
|
|
nm_version->nm_num = ++nm_class->nm_sublist_num;
|
|
version = nm_version->nm_num;
|
|
nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
|
|
fp->fp_os.fp_subtype_nm);
|
|
if (nm_subtype) {
|
|
if (nm_subtype->nm_num == 0)
|
|
nm_subtype->nm_num =
|
|
++nm_version->nm_sublist_num;
|
|
subtype = nm_subtype->nm_num;
|
|
}
|
|
}
|
|
|
|
|
|
DEBUG(fp, "\tsignature %d:%d:%d %s", class, version, subtype,
|
|
print_ioctl(fp));
|
|
|
|
PF_OSFP_PACK(fp->fp_os.fp_os, class, version, subtype);
|
|
fingerprint_count++;
|
|
|
|
#ifdef FAKE_PF_KERNEL
|
|
/* Linked to the sys/net/pf_osfp.c. Call pf_osfp_add() */
|
|
if ((errno = pf_osfp_add(fp)))
|
|
#else
|
|
if ((opts & PF_OPT_NOACTION) == 0 && ioctl(dev, DIOCOSFPADD, fp))
|
|
#endif /* FAKE_PF_KERNEL */
|
|
{
|
|
if (errno == EEXIST) {
|
|
warn("Duplicate signature for %s %s %s",
|
|
fp->fp_os.fp_class_nm,
|
|
fp->fp_os.fp_version_nm,
|
|
fp->fp_os.fp_subtype_nm);
|
|
|
|
} else {
|
|
err(1, "DIOCOSFPADD");
|
|
}
|
|
}
|
|
}
|
|
|
|
/* import a fingerprint from the kernel */
|
|
void
|
|
import_fingerprint(struct pf_osfp_ioctl *fp)
|
|
{
|
|
struct name_entry *nm_class, *nm_version, *nm_subtype;
|
|
int class, version, subtype;
|
|
|
|
PF_OSFP_UNPACK(fp->fp_os.fp_os, class, version, subtype);
|
|
|
|
nm_class = fingerprint_name_entry(&classes, fp->fp_os.fp_class_nm);
|
|
if (nm_class->nm_num == 0) {
|
|
nm_class->nm_num = class;
|
|
class_count = MAX(class_count, class);
|
|
}
|
|
|
|
nm_version = fingerprint_name_entry(&nm_class->nm_sublist,
|
|
fp->fp_os.fp_version_nm);
|
|
if (nm_version) {
|
|
if (nm_version->nm_num == 0) {
|
|
nm_version->nm_num = version;
|
|
nm_class->nm_sublist_num = MAX(nm_class->nm_sublist_num,
|
|
version);
|
|
}
|
|
nm_subtype = fingerprint_name_entry(&nm_version->nm_sublist,
|
|
fp->fp_os.fp_subtype_nm);
|
|
if (nm_subtype) {
|
|
if (nm_subtype->nm_num == 0) {
|
|
nm_subtype->nm_num = subtype;
|
|
nm_version->nm_sublist_num =
|
|
MAX(nm_version->nm_sublist_num, subtype);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
fingerprint_count++;
|
|
DEBUG(fp, "import signature %d:%d:%d", class, version, subtype);
|
|
}
|
|
|
|
/* Find an entry for a fingerprints class/version/subtype */
|
|
struct name_entry *
|
|
fingerprint_name_entry(struct name_list *list, char *name)
|
|
{
|
|
struct name_entry *nm_entry;
|
|
|
|
if (name == NULL || strlen(name) == 0)
|
|
return (NULL);
|
|
|
|
LIST_FOREACH(nm_entry, list, nm_entry) {
|
|
if (strcasecmp(nm_entry->nm_name, name) == 0) {
|
|
/* We'll move this to the front of the list later */
|
|
LIST_REMOVE(nm_entry, nm_entry);
|
|
break;
|
|
}
|
|
}
|
|
if (nm_entry == NULL) {
|
|
nm_entry = calloc(1, sizeof(*nm_entry));
|
|
if (nm_entry == NULL)
|
|
err(1, "calloc");
|
|
LIST_INIT(&nm_entry->nm_sublist);
|
|
strlcpy(nm_entry->nm_name, name, sizeof(nm_entry->nm_name));
|
|
}
|
|
LIST_INSERT_HEAD(list, nm_entry, nm_entry);
|
|
return (nm_entry);
|
|
}
|
|
|
|
|
|
void
|
|
print_name_list(int opts, struct name_list *nml, const char *prefix)
|
|
{
|
|
char newprefix[32];
|
|
struct name_entry *nm;
|
|
|
|
LIST_FOREACH(nm, nml, nm_entry) {
|
|
snprintf(newprefix, sizeof(newprefix), "%s%s\t", prefix,
|
|
nm->nm_name);
|
|
printf("%s\n", newprefix);
|
|
print_name_list(opts, &nm->nm_sublist, newprefix);
|
|
}
|
|
}
|
|
|
|
void
|
|
sort_name_list(int opts, struct name_list *nml)
|
|
{
|
|
struct name_list new;
|
|
struct name_entry *nm, *nmsearch, *nmlast;
|
|
|
|
/* yes yes, it's a very slow sort. so sue me */
|
|
|
|
LIST_INIT(&new);
|
|
|
|
while ((nm = LIST_FIRST(nml)) != NULL) {
|
|
LIST_REMOVE(nm, nm_entry);
|
|
nmlast = NULL;
|
|
LIST_FOREACH(nmsearch, &new, nm_entry) {
|
|
if (strcasecmp(nmsearch->nm_name, nm->nm_name) > 0) {
|
|
LIST_INSERT_BEFORE(nmsearch, nm, nm_entry);
|
|
break;
|
|
}
|
|
nmlast = nmsearch;
|
|
}
|
|
if (nmsearch == NULL) {
|
|
if (nmlast)
|
|
LIST_INSERT_AFTER(nmlast, nm, nm_entry);
|
|
else
|
|
LIST_INSERT_HEAD(&new, nm, nm_entry);
|
|
}
|
|
|
|
sort_name_list(opts, &nm->nm_sublist);
|
|
}
|
|
nmlast = NULL;
|
|
while ((nm = LIST_FIRST(&new)) != NULL) {
|
|
LIST_REMOVE(nm, nm_entry);
|
|
if (nmlast == NULL)
|
|
LIST_INSERT_HEAD(nml, nm, nm_entry);
|
|
else
|
|
LIST_INSERT_AFTER(nmlast, nm, nm_entry);
|
|
nmlast = nm;
|
|
}
|
|
}
|
|
|
|
/* parse the next integer in a formatted config file line */
|
|
int
|
|
get_int(char **line, size_t *len, int *var, int *mod,
|
|
const char *name, int flags, int max, const char *filename, int lineno)
|
|
{
|
|
int fieldlen, i;
|
|
char *field;
|
|
long val = 0;
|
|
|
|
if (mod)
|
|
*mod = 0;
|
|
*var = 0;
|
|
|
|
field = get_field(line, len, &fieldlen);
|
|
if (field == NULL)
|
|
return (1);
|
|
if (fieldlen == 0) {
|
|
fprintf(stderr, "%s:%d empty %s\n", filename, lineno, name);
|
|
return (1);
|
|
}
|
|
|
|
i = 0;
|
|
if ((*field == '%' || *field == 'S' || *field == 'T' || *field == '*')
|
|
&& fieldlen >= 1) {
|
|
switch (*field) {
|
|
case 'S':
|
|
if (mod && (flags & T_MSS))
|
|
*mod = T_MSS;
|
|
if (fieldlen == 1)
|
|
return (0);
|
|
break;
|
|
case 'T':
|
|
if (mod && (flags & T_MTU))
|
|
*mod = T_MTU;
|
|
if (fieldlen == 1)
|
|
return (0);
|
|
break;
|
|
case '*':
|
|
if (fieldlen != 1) {
|
|
fprintf(stderr, "%s:%d long '%c' %s\n",
|
|
filename, lineno, *field, name);
|
|
return (1);
|
|
}
|
|
if (mod && (flags & T_DC)) {
|
|
*mod = T_DC;
|
|
return (0);
|
|
}
|
|
case '%':
|
|
if (mod && (flags & T_MOD))
|
|
*mod = T_MOD;
|
|
if (fieldlen == 1) {
|
|
fprintf(stderr, "%s:%d modulus %s must have a "
|
|
"value\n", filename, lineno, name);
|
|
return (1);
|
|
}
|
|
break;
|
|
}
|
|
if (mod == NULL || *mod == 0) {
|
|
fprintf(stderr, "%s:%d does not allow %c' %s\n",
|
|
filename, lineno, *field, name);
|
|
return (1);
|
|
}
|
|
i++;
|
|
}
|
|
|
|
for (; i < fieldlen; i++) {
|
|
if (field[i] < '0' || field[i] > '9') {
|
|
fprintf(stderr, "%s:%d non-digit character in %s\n",
|
|
filename, lineno, name);
|
|
return (1);
|
|
}
|
|
val = val * 10 + field[i] - '0';
|
|
if (val < 0) {
|
|
fprintf(stderr, "%s:%d %s overflowed\n", filename,
|
|
lineno, name);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
if (val > max) {
|
|
fprintf(stderr, "%s:%d %s value %ld > %d\n", filename, lineno,
|
|
name, val, max);
|
|
return (1);
|
|
}
|
|
*var = (int)val;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* parse the next string in a formatted config file line */
|
|
int
|
|
get_str(char **line, size_t *len, char **v, const char *name, int minlen,
|
|
const char *filename, int lineno)
|
|
{
|
|
int fieldlen;
|
|
char *ptr;
|
|
|
|
ptr = get_field(line, len, &fieldlen);
|
|
if (ptr == NULL)
|
|
return (1);
|
|
if (fieldlen < minlen) {
|
|
fprintf(stderr, "%s:%d too short %s\n", filename, lineno, name);
|
|
return (1);
|
|
}
|
|
if ((*v = malloc(fieldlen + 1)) == NULL) {
|
|
perror("malloc()");
|
|
return (1);
|
|
}
|
|
memcpy(*v, ptr, fieldlen);
|
|
(*v)[fieldlen] = '\0';
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Parse out the TCP opts */
|
|
int
|
|
get_tcpopts(const char *filename, int lineno, const char *tcpopts,
|
|
pf_tcpopts_t *packed, int *optcnt, int *mss, int *mss_mod, int *wscale,
|
|
int *wscale_mod, int *ts0)
|
|
{
|
|
int i, opt;
|
|
|
|
*packed = 0;
|
|
*optcnt = 0;
|
|
*wscale = 0;
|
|
*wscale_mod = T_DC;
|
|
*mss = 0;
|
|
*mss_mod = T_DC;
|
|
*ts0 = 0;
|
|
if (strcmp(tcpopts, ".") == 0)
|
|
return (0);
|
|
|
|
for (i = 0; tcpopts[i] && *optcnt < PF_OSFP_MAX_OPTS;) {
|
|
switch ((opt = toupper(tcpopts[i++]))) {
|
|
case 'N': /* FALLTHROUGH */
|
|
case 'S':
|
|
*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
|
|
(opt == 'N' ? PF_OSFP_TCPOPT_NOP :
|
|
PF_OSFP_TCPOPT_SACK);
|
|
break;
|
|
case 'W': /* FALLTHROUGH */
|
|
case 'M': {
|
|
int *this_mod, *this;
|
|
|
|
if (opt == 'W') {
|
|
this = wscale;
|
|
this_mod = wscale_mod;
|
|
} else {
|
|
this = mss;
|
|
this_mod = mss_mod;
|
|
}
|
|
*this = 0;
|
|
*this_mod = 0;
|
|
|
|
*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
|
|
(opt == 'W' ? PF_OSFP_TCPOPT_WSCALE :
|
|
PF_OSFP_TCPOPT_MSS);
|
|
if (tcpopts[i] == '*' && (tcpopts[i + 1] == '\0' ||
|
|
tcpopts[i + 1] == ',')) {
|
|
*this_mod = T_DC;
|
|
i++;
|
|
break;
|
|
}
|
|
|
|
if (tcpopts[i] == '%') {
|
|
*this_mod = T_MOD;
|
|
i++;
|
|
}
|
|
do {
|
|
if (!isdigit(tcpopts[i])) {
|
|
fprintf(stderr, "%s:%d unknown "
|
|
"character '%c' in %c TCP opt\n",
|
|
filename, lineno, tcpopts[i], opt);
|
|
return (1);
|
|
}
|
|
*this = (*this * 10) + tcpopts[i++] - '0';
|
|
} while(tcpopts[i] != ',' && tcpopts[i] != '\0');
|
|
break;
|
|
}
|
|
case 'T':
|
|
if (tcpopts[i] == '0') {
|
|
*ts0 = 1;
|
|
i++;
|
|
}
|
|
*packed = (*packed << PF_OSFP_TCPOPT_BITS) |
|
|
PF_OSFP_TCPOPT_TS;
|
|
break;
|
|
}
|
|
(*optcnt) ++;
|
|
if (tcpopts[i] == '\0')
|
|
break;
|
|
if (tcpopts[i] != ',') {
|
|
fprintf(stderr, "%s:%d unknown option to %c TCP opt\n",
|
|
filename, lineno, opt);
|
|
return (1);
|
|
}
|
|
i++;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* rip the next field ouf of a formatted config file line */
|
|
char *
|
|
get_field(char **line, size_t *len, int *fieldlen)
|
|
{
|
|
char *ret, *ptr = *line;
|
|
size_t plen = *len;
|
|
|
|
|
|
while (plen && isspace(*ptr)) {
|
|
plen--;
|
|
ptr++;
|
|
}
|
|
ret = ptr;
|
|
*fieldlen = 0;
|
|
|
|
for (; plen > 0 && *ptr != ':'; plen--, ptr++)
|
|
(*fieldlen)++;
|
|
if (plen) {
|
|
*line = ptr + 1;
|
|
*len = plen - 1;
|
|
} else {
|
|
*len = 0;
|
|
}
|
|
while (*fieldlen && isspace(ret[*fieldlen - 1]))
|
|
(*fieldlen)--;
|
|
return (ret);
|
|
}
|
|
|
|
|
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const char *
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print_ioctl(struct pf_osfp_ioctl *fp)
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{
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static char buf[1024];
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char tmp[32];
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int i, opt;
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*buf = '\0';
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if (fp->fp_flags & PF_OSFP_WSIZE_DC)
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strlcat(buf, "*", sizeof(buf));
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else if (fp->fp_flags & PF_OSFP_WSIZE_MSS)
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strlcat(buf, "S", sizeof(buf));
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else if (fp->fp_flags & PF_OSFP_WSIZE_MTU)
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strlcat(buf, "T", sizeof(buf));
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else {
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if (fp->fp_flags & PF_OSFP_WSIZE_MOD)
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strlcat(buf, "%", sizeof(buf));
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snprintf(tmp, sizeof(tmp), "%d", fp->fp_wsize);
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strlcat(buf, tmp, sizeof(buf));
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}
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strlcat(buf, ":", sizeof(buf));
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snprintf(tmp, sizeof(tmp), "%d", fp->fp_ttl);
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strlcat(buf, tmp, sizeof(buf));
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strlcat(buf, ":", sizeof(buf));
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if (fp->fp_flags & PF_OSFP_DF)
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strlcat(buf, "1", sizeof(buf));
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else
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strlcat(buf, "0", sizeof(buf));
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strlcat(buf, ":", sizeof(buf));
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if (fp->fp_flags & PF_OSFP_PSIZE_DC)
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strlcat(buf, "*", sizeof(buf));
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else {
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if (fp->fp_flags & PF_OSFP_PSIZE_MOD)
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strlcat(buf, "%", sizeof(buf));
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snprintf(tmp, sizeof(tmp), "%d", fp->fp_psize);
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strlcat(buf, tmp, sizeof(buf));
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}
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strlcat(buf, ":", sizeof(buf));
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if (fp->fp_optcnt == 0)
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strlcat(buf, ".", sizeof(buf));
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for (i = fp->fp_optcnt - 1; i >= 0; i--) {
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opt = fp->fp_tcpopts >> (i * PF_OSFP_TCPOPT_BITS);
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opt &= (1 << PF_OSFP_TCPOPT_BITS) - 1;
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switch (opt) {
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case PF_OSFP_TCPOPT_NOP:
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strlcat(buf, "N", sizeof(buf));
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break;
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case PF_OSFP_TCPOPT_SACK:
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strlcat(buf, "S", sizeof(buf));
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break;
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case PF_OSFP_TCPOPT_TS:
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strlcat(buf, "T", sizeof(buf));
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if (fp->fp_flags & PF_OSFP_TS0)
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strlcat(buf, "0", sizeof(buf));
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break;
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case PF_OSFP_TCPOPT_MSS:
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strlcat(buf, "M", sizeof(buf));
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if (fp->fp_flags & PF_OSFP_MSS_DC)
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strlcat(buf, "*", sizeof(buf));
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else {
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if (fp->fp_flags & PF_OSFP_MSS_MOD)
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strlcat(buf, "%", sizeof(buf));
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snprintf(tmp, sizeof(tmp), "%d", fp->fp_mss);
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strlcat(buf, tmp, sizeof(buf));
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}
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break;
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case PF_OSFP_TCPOPT_WSCALE:
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strlcat(buf, "W", sizeof(buf));
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if (fp->fp_flags & PF_OSFP_WSCALE_DC)
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strlcat(buf, "*", sizeof(buf));
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else {
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if (fp->fp_flags & PF_OSFP_WSCALE_MOD)
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strlcat(buf, "%", sizeof(buf));
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snprintf(tmp, sizeof(tmp), "%d", fp->fp_wscale);
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strlcat(buf, tmp, sizeof(buf));
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}
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break;
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}
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if (i != 0)
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strlcat(buf, ",", sizeof(buf));
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}
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strlcat(buf, ":", sizeof(buf));
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strlcat(buf, fp->fp_os.fp_class_nm, sizeof(buf));
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strlcat(buf, ":", sizeof(buf));
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strlcat(buf, fp->fp_os.fp_version_nm, sizeof(buf));
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strlcat(buf, ":", sizeof(buf));
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strlcat(buf, fp->fp_os.fp_subtype_nm, sizeof(buf));
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strlcat(buf, ":", sizeof(buf));
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snprintf(tmp, sizeof(tmp), "TcpOpts %d 0x%llx", fp->fp_optcnt,
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(long long int)fp->fp_tcpopts);
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strlcat(buf, tmp, sizeof(buf));
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return (buf);
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}
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