forked from osmocom/wireshark
527 lines
16 KiB
C
527 lines
16 KiB
C
/* packet-pflog.c
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* Routines for pflog (OpenBSD Firewall Logging) packet disassembly
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*
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* Copyright 2001 Mike Frantzen
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* All rights reserved.
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*
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* SPDX-License-Identifier: BSD-1-Clause
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*/
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/* Specifications... :
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http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/if_pflog.c
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http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/if_pflog.h
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/aftypes.h>
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#include <epan/addr_resolv.h>
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#include <epan/expert.h>
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#include <epan/prefs.h>
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void proto_register_pflog(void);
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void proto_reg_handoff_pflog(void);
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void proto_register_old_pflog(void);
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void proto_reg_handoff_old_pflog(void);
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static dissector_handle_t ip_handle, ipv6_handle;
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/* header fields */
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static int proto_pflog = -1;
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static int hf_pflog_length = -1;
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static int hf_pflog_af = -1;
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static int hf_pflog_action = -1;
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static int hf_pflog_reason = -1;
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static int hf_pflog_ifname = -1;
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static int hf_pflog_ruleset = -1;
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static int hf_pflog_rulenr = -1;
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static int hf_pflog_subrulenr = -1;
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static int hf_pflog_uid = -1;
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static int hf_pflog_pid = -1;
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static int hf_pflog_rule_uid = -1;
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static int hf_pflog_rule_pid = -1;
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static int hf_pflog_dir = -1;
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static int hf_pflog_rewritten = -1;
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static int hf_pflog_pad = -1;
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static int hf_pflog_saddr_ipv4 = -1;
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static int hf_pflog_daddr_ipv4 = -1;
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static int hf_pflog_saddr_ipv6 = -1;
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static int hf_pflog_daddr_ipv6 = -1;
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static int hf_pflog_saddr = -1;
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static int hf_pflog_daddr = -1;
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static int hf_pflog_sport = -1;
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static int hf_pflog_dport = -1;
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static gint ett_pflog = -1;
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static expert_field ei_pflog_invalid_header_length = EI_INIT;
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/* old header */
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static int proto_old_pflog = -1;
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static int hf_old_pflog_af = -1;
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static int hf_old_pflog_ifname = -1;
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static int hf_old_pflog_rnr = -1;
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static int hf_old_pflog_reason = -1;
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static int hf_old_pflog_action = -1;
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static int hf_old_pflog_dir = -1;
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static gint ett_old_pflog = -1;
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static gboolean uid_endian = TRUE;
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#define LEN_PFLOG_BSD34 48
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#define LEN_PFLOG_BSD38 64
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#define LEN_PFLOG_BSD49 100
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static const value_string pflog_af_vals[] = {
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{ BSD_AF_INET, "IPv4" },
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{ BSD_AF_INET6_BSD, "IPv6" },
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{ 0, NULL }
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};
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static const value_string pflog_reason_vals[] = {
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{ 0, "match" },
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{ 1, "bad-offset" },
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{ 2, "fragment" },
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{ 3, "short" },
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{ 4, "normalize" },
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{ 5, "memory" },
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{ 6, "timestamp" },
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{ 7, "congestion" },
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{ 8, "ip-option" },
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{ 9, "proto-cksum" },
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{ 10, "state-mismatch" },
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{ 11, "state-ins-fail" },
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{ 12, "max-states" },
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{ 13, "srcnode-limit" },
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{ 14, "syn-proxy" },
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{ 0, NULL }
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};
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/* Actions */
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enum { PF_PASS, PF_DROP, PF_SCRUB, PF_NOSCRUB, PF_NAT, PF_NONAT,
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PF_BINAT, PF_NOBINAT, PF_RDR, PF_NORDR, PF_SYNPROXY_DROP, PF_DEFER,
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PF_MATCH, PF_DIVERT, PF_RT };
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static const value_string pflog_action_vals[] = {
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{ PF_MATCH, "match" },
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{ PF_SCRUB, "scrub" },
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{ PF_PASS, "pass" },
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{ PF_DROP, "block" },
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{ PF_DIVERT, "divert" },
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{ PF_NAT, "nat" },
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{ PF_NONAT, "nat" },
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{ PF_BINAT, "binat" },
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{ PF_NOBINAT, "binat" },
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{ PF_RDR, "rdr" },
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{ PF_NORDR, "rdr" },
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{ 0, NULL }
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};
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/* Directions */
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#define PF_OLD_IN 0
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#define PF_OLD_OUT 1
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#define PF_INOUT 0
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#define PF_IN 1
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#define PF_OUT 2
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static const value_string pflog_old_dir_vals[] = {
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{ PF_OLD_IN, "in" },
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{ PF_OLD_OUT, "out" },
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{ 0, NULL }
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};
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static const value_string pflog_dir_vals[] = {
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{ PF_INOUT, "inout" },
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{ PF_IN, "in" },
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{ PF_OUT, "out" },
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{ 0, NULL }
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};
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static int
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dissect_pflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
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{
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tvbuff_t *next_tvb;
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proto_tree *pflog_tree;
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proto_item *ti = NULL, *ti_len;
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int length;
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guint8 af, action;
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const guint8 *ifname;
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guint32 rulenr;
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guint8 pad_len = 3;
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gint offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PFLOG");
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ti = proto_tree_add_item(tree, proto_pflog, tvb, offset, -1, ENC_NA);
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pflog_tree = proto_item_add_subtree(ti, ett_pflog);
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length = tvb_get_guint8(tvb, offset) + pad_len;
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ti_len = proto_tree_add_item(pflog_tree, hf_pflog_length, tvb, offset, 1, ENC_BIG_ENDIAN);
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if(length < LEN_PFLOG_BSD34)
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{
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expert_add_info_format(pinfo, ti_len, &ei_pflog_invalid_header_length, "Invalid header length %u", length);
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}
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offset += 1;
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proto_tree_add_item(pflog_tree, hf_pflog_af, tvb, offset, 1, ENC_BIG_ENDIAN);
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af = tvb_get_guint8(tvb, offset);
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offset += 1;
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proto_tree_add_item(pflog_tree, hf_pflog_action, tvb, offset, 1, ENC_BIG_ENDIAN);
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action = tvb_get_guint8(tvb, offset);
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offset += 1;
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proto_tree_add_item(pflog_tree, hf_pflog_reason, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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proto_tree_add_item_ret_string(pflog_tree, hf_pflog_ifname, tvb, offset, 16, ENC_ASCII|ENC_NA, pinfo->pool, &ifname);
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offset += 16;
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proto_tree_add_item(pflog_tree, hf_pflog_ruleset, tvb, offset, 16, ENC_ASCII|ENC_NA);
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offset += 16;
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proto_tree_add_item(pflog_tree, hf_pflog_rulenr, tvb, offset, 4, ENC_BIG_ENDIAN);
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rulenr = tvb_get_ntohs(tvb, offset);
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offset += 4;
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proto_tree_add_item(pflog_tree, hf_pflog_subrulenr, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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if(length >= LEN_PFLOG_BSD38)
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{
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int endian = uid_endian ? ENC_BIG_ENDIAN : ENC_LITTLE_ENDIAN;
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proto_tree_add_item(pflog_tree, hf_pflog_uid, tvb, offset, 4, endian);
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offset += 4;
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proto_tree_add_item(pflog_tree, hf_pflog_pid, tvb, offset, 4, endian);
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offset += 4;
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proto_tree_add_item(pflog_tree, hf_pflog_rule_uid, tvb, offset, 4, endian);
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offset += 4;
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proto_tree_add_item(pflog_tree, hf_pflog_rule_pid, tvb, offset, 4, endian);
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offset += 4;
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}
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proto_tree_add_item(pflog_tree, hf_pflog_dir, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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if(length >= LEN_PFLOG_BSD49)
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{
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pad_len = 2;
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length -= 3; /* With OpenBSD >= 4.8 the length is the length of full Header (with padding..) */
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proto_tree_add_item(pflog_tree, hf_pflog_rewritten, tvb, offset, 1, ENC_BIG_ENDIAN);
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offset += 1;
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}
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proto_tree_add_item(pflog_tree, hf_pflog_pad, tvb, offset, pad_len, ENC_NA);
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offset += pad_len;
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if(length >= LEN_PFLOG_BSD49)
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{
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switch (af) {
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case BSD_AF_INET:
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proto_tree_add_item(pflog_tree, hf_pflog_saddr_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 16;
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proto_tree_add_item(pflog_tree, hf_pflog_daddr_ipv4, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 16;
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break;
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case BSD_AF_INET6_BSD:
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proto_tree_add_item(pflog_tree, hf_pflog_saddr_ipv6, tvb, offset, 16, ENC_NA);
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offset += 16;
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proto_tree_add_item(pflog_tree, hf_pflog_daddr_ipv6, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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default:
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proto_tree_add_item(pflog_tree, hf_pflog_saddr, tvb, offset, 16, ENC_NA);
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offset += 16;
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proto_tree_add_item(pflog_tree, hf_pflog_daddr, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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}
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proto_tree_add_item(pflog_tree, hf_pflog_sport, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(pflog_tree, hf_pflog_dport, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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}
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proto_item_set_text(ti, "PF Log %s %s on %s by rule %u",
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val_to_str(af, pflog_af_vals, "unknown (%u)"),
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val_to_str(action, pflog_action_vals, "unknown (%u)"),
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ifname,
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rulenr);
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proto_item_set_len(ti, offset);
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/* Set the tvbuff for the payload after the header */
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next_tvb = tvb_new_subset_remaining(tvb, length);
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switch (af) {
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case BSD_AF_INET:
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call_dissector(ip_handle, next_tvb, pinfo, tree);
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break;
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case BSD_AF_INET6_BSD:
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call_dissector(ipv6_handle, next_tvb, pinfo, tree);
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break;
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default:
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call_data_dissector(next_tvb, pinfo, tree);
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break;
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}
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col_prepend_fstr(pinfo->cinfo, COL_INFO, "[%s %s/%u] ",
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val_to_str(action, pflog_action_vals, "unknown (%u)"),
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ifname,
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rulenr);
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return tvb_captured_length(tvb);
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}
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void
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proto_register_pflog(void)
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{
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static hf_register_info hf[] = {
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{ &hf_pflog_length,
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{ "Header Length", "pflog.length", FT_UINT8, BASE_DEC, NULL, 0x0,
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"Length of Header", HFILL }},
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{ &hf_pflog_af,
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{ "Address Family", "pflog.af", FT_UINT32, BASE_DEC, VALS(pflog_af_vals), 0x0,
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"Protocol (IPv4 vs IPv6)", HFILL }},
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{ &hf_pflog_action,
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{ "Action", "pflog.action", FT_UINT8, BASE_DEC, VALS(pflog_action_vals), 0x0,
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"Action taken by PF on the packet", HFILL }},
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{ &hf_pflog_reason,
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{ "Reason", "pflog.reason", FT_UINT8, BASE_DEC, VALS(pflog_reason_vals), 0x0,
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"Reason for logging the packet", HFILL }},
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{ &hf_pflog_ifname,
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{ "Interface", "pflog.ifname", FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_ruleset,
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{ "Ruleset", "pflog.ruleset", FT_STRING, BASE_NONE, NULL, 0x0,
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"Ruleset name in anchor", HFILL }},
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{ &hf_pflog_rulenr,
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{ "Rule Number", "pflog.rulenr", FT_INT32, BASE_DEC, NULL, 0x0,
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"Last matched firewall main ruleset rule number", HFILL }},
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{ &hf_pflog_subrulenr,
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{ "Sub Rule Number", "pflog.subrulenr", FT_INT32, BASE_DEC, NULL, 0x0,
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"Last matched firewall anchored ruleset rule number", HFILL }},
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{ &hf_pflog_uid,
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{ "UID", "pflog.uid", FT_INT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_pid,
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{ "PID", "pflog.pid", FT_INT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_rule_uid,
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{ "Rule UID", "pflog.rule_uid", FT_INT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_rule_pid,
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{ "Rule PID", "pflog.rule_pid", FT_INT32, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_rewritten,
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{ "Rewritten", "pflog.rewritten", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_pad,
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{ "Padding", "pflog.pad", FT_BYTES, BASE_NONE, NULL, 0x0,
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"Must be Zero", HFILL }},
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{ &hf_pflog_saddr_ipv4,
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{ "Source Address", "pflog.saddr.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_daddr_ipv4,
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{ "Destination Address", "pflog.daddr.ipv4", FT_IPv4, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_saddr_ipv6,
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{ "Source Address", "pflog.saddr.ipv6", FT_IPv6, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_daddr_ipv6,
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{ "Destination Address", "pflog.daddr.ipv6", FT_IPv6, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_saddr,
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{ "Source Address", "pflog.saddr.bytes", FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_daddr,
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{ "Destination Address", "pflog.daddr.bytes", FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_sport,
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{ "Source Port", "pflog.sport", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_dport,
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{ "Destination Port", "pflog.dport", FT_UINT16, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_pflog_dir,
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{ "Direction", "pflog.dir", FT_UINT8, BASE_DEC, VALS(pflog_dir_vals), 0x0,
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"Direction of packet in stack (inbound versus outbound)", HFILL }},
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};
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static gint *ett[] = { &ett_pflog };
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static ei_register_info ei[] = {
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{ &ei_pflog_invalid_header_length, { "pflog.invalid_header_length", PI_MALFORMED, PI_ERROR, "Invalid header length ", EXPFILL }},
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};
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expert_module_t* expert_pflog;
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module_t *pflog_module;
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proto_pflog = proto_register_protocol("OpenBSD Packet Filter log file",
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"PFLOG", "pflog");
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proto_register_field_array(proto_pflog, hf, array_length(hf));
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proto_register_subtree_array(ett, array_length(ett));
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expert_pflog = expert_register_protocol(proto_pflog);
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expert_register_field_array(expert_pflog, ei, array_length(ei));
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pflog_module = prefs_register_protocol(proto_pflog, NULL);
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prefs_register_bool_preference(pflog_module, "uid_endian",
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"Display UID as big endian value",
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"Whether or not UID and PID fields are dissected in big or little endian",
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&uid_endian);
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}
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void
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proto_reg_handoff_pflog(void)
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{
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dissector_handle_t pflog_handle;
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ip_handle = find_dissector_add_dependency("ip", proto_pflog);
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ipv6_handle = find_dissector_add_dependency("ipv6", proto_pflog);
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pflog_handle = create_dissector_handle(dissect_pflog, proto_pflog);
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dissector_add_uint("wtap_encap", WTAP_ENCAP_PFLOG, pflog_handle);
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}
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static int
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dissect_old_pflog(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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tvbuff_t *next_tvb;
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proto_tree *pflog_tree;
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proto_item *ti;
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guint32 af;
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const guint8 *ifname;
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guint16 rnr, action;
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gint offset = 0;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "PFLOG-OLD");
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ti = proto_tree_add_item(tree, proto_old_pflog, tvb, 0, -1, ENC_NA);
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pflog_tree = proto_item_add_subtree(ti, ett_pflog);
|
|
|
|
proto_tree_add_item(pflog_tree, hf_old_pflog_af, tvb, offset, 4, ENC_BIG_ENDIAN);
|
|
|
|
af = tvb_get_ntohl(tvb, offset);
|
|
offset +=4;
|
|
|
|
proto_tree_add_item_ret_string(pflog_tree, hf_old_pflog_ifname, tvb, offset, 16, ENC_ASCII|ENC_NA, pinfo->pool, &ifname);
|
|
offset +=16;
|
|
|
|
proto_tree_add_item(pflog_tree, hf_old_pflog_rnr, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
rnr = tvb_get_ntohs(tvb, offset);
|
|
offset +=2;
|
|
|
|
proto_tree_add_item(pflog_tree, hf_old_pflog_reason, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset +=2;
|
|
|
|
proto_tree_add_item(pflog_tree, hf_old_pflog_action, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
action = tvb_get_ntohs(tvb, offset);
|
|
offset +=2;
|
|
|
|
proto_tree_add_item(pflog_tree, hf_old_pflog_dir, tvb, offset, 2, ENC_BIG_ENDIAN);
|
|
offset +=2;
|
|
|
|
proto_item_set_text(ti, "PF Log (pre 3.4) %s %s on %s by rule %d",
|
|
val_to_str(af, pflog_af_vals, "unknown (%u)"),
|
|
val_to_str(action, pflog_action_vals, "unknown (%u)"),
|
|
ifname,
|
|
rnr);
|
|
proto_item_set_len(ti, offset);
|
|
|
|
/* Set the tvbuff for the payload after the header */
|
|
next_tvb = tvb_new_subset_remaining(tvb, offset);
|
|
|
|
switch (af) {
|
|
|
|
case BSD_AF_INET:
|
|
offset += call_dissector(ip_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
case BSD_AF_INET6_BSD:
|
|
offset += call_dissector(ipv6_handle, next_tvb, pinfo, tree);
|
|
break;
|
|
|
|
default:
|
|
offset += call_data_dissector(next_tvb, pinfo, tree);
|
|
break;
|
|
}
|
|
|
|
col_prepend_fstr(pinfo->cinfo, COL_INFO, "[%s %s/#%d] ",
|
|
val_to_str(action, pflog_action_vals, "unknown (%u)"),
|
|
ifname,
|
|
rnr);
|
|
|
|
return offset;
|
|
}
|
|
|
|
void
|
|
proto_register_old_pflog(void)
|
|
{
|
|
static hf_register_info hf[] = {
|
|
{ &hf_old_pflog_af,
|
|
{ "Address Family", "pflog.af", FT_UINT32, BASE_DEC, VALS(pflog_af_vals), 0x0,
|
|
"Protocol (IPv4 vs IPv6)", HFILL }},
|
|
{ &hf_old_pflog_ifname,
|
|
{ "Interface", "pflog.ifname", FT_STRING, BASE_NONE, NULL, 0x0,
|
|
NULL, HFILL }},
|
|
{ &hf_old_pflog_rnr,
|
|
{ "Rule Number", "pflog.rnr", FT_INT16, BASE_DEC, NULL, 0x0,
|
|
"Last matched firewall rule number", HFILL }},
|
|
{ &hf_old_pflog_reason,
|
|
{ "Reason", "pflog.reason", FT_UINT16, BASE_DEC, VALS(pflog_reason_vals), 0x0,
|
|
"Reason for logging the packet", HFILL }},
|
|
{ &hf_old_pflog_action,
|
|
{ "Action", "pflog.action", FT_UINT16, BASE_DEC, VALS(pflog_action_vals), 0x0,
|
|
"Action taken by PF on the packet", HFILL }},
|
|
{ &hf_old_pflog_dir,
|
|
{ "Direction", "pflog.dir", FT_UINT16, BASE_DEC, VALS(pflog_old_dir_vals), 0x0,
|
|
"Direction of packet in stack (inbound versus outbound)", HFILL }},
|
|
};
|
|
static gint *ett[] = { &ett_old_pflog };
|
|
|
|
proto_old_pflog = proto_register_protocol(
|
|
"OpenBSD Packet Filter log file, pre 3.4",
|
|
"PFLOG-OLD", "pflog-old");
|
|
proto_register_field_array(proto_old_pflog, hf, array_length(hf));
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
}
|
|
|
|
void
|
|
proto_reg_handoff_old_pflog(void)
|
|
{
|
|
dissector_handle_t pflog_handle;
|
|
|
|
pflog_handle = create_dissector_handle(dissect_old_pflog, proto_old_pflog);
|
|
dissector_add_uint("wtap_encap", WTAP_ENCAP_OLD_PFLOG, pflog_handle);
|
|
}
|
|
/*
|
|
* Editor modelines
|
|
*
|
|
* Local Variables:
|
|
* c-basic-offset: 2
|
|
* tab-width: 8
|
|
* indent-tabs-mode: nil
|
|
* End:
|
|
*
|
|
* ex: set shiftwidth=2 tabstop=8 expandtab:
|
|
* :indentSize=2:tabSize=8:noTabs=true:
|
|
*/
|