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nfqws: dissect struct
This commit is contained in:
bol-van
parent
d551f2f4ae
commit
6514b6f4c3
@ -869,60 +869,49 @@ void proto_skip_ipv6(uint8_t **data, size_t *len, uint8_t *proto_type, uint8_t *
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// we have garbage
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}
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void proto_dissect_l3l4(
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uint8_t *data, size_t len,
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struct ip **ip, struct ip6_hdr **ip6,
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uint8_t *proto,
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struct tcphdr **tcp,
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struct udphdr **udp,
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size_t *transport_len,
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uint8_t **data_payload, size_t *len_payload)
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void proto_dissect_l3l4(uint8_t *data, size_t len,struct dissect *dis)
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{
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*ip = NULL;
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*ip6 = NULL;
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*proto = 0;
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*tcp = NULL;
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*transport_len = 0;
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*udp = NULL;
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*data_payload = NULL;
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*len_payload = 0;
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memset(dis,0,sizeof(*dis));
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dis->data_pkt = data;
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dis->len_pkt = len;
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if (proto_check_ipv4(data, len))
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{
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*ip = (struct ip *) data;
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*proto = (*ip)->ip_p;
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dis->ip = (struct ip *) data;
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dis->proto = dis->ip->ip_p;
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proto_skip_ipv4(&data, &len);
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}
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else if (proto_check_ipv6(data, len))
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{
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*ip6 = (struct ip6_hdr *) data;
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proto_skip_ipv6(&data, &len, proto, NULL);
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dis->ip6 = (struct ip6_hdr *) data;
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proto_skip_ipv6(&data, &len, &dis->proto, NULL);
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}
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else
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{
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return;
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}
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if (*proto==IPPROTO_TCP && proto_check_tcp(data, len))
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if (dis->proto==IPPROTO_TCP && proto_check_tcp(data, len))
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{
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*tcp = (struct tcphdr *) data;
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*transport_len = len;
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dis->tcp = (struct tcphdr *) data;
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dis->transport_len = len;
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proto_skip_tcp(&data, &len);
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*data_payload = data;
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*len_payload = len;
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dis->data_payload = data;
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dis->len_payload = len;
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}
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else if (*proto==IPPROTO_UDP && proto_check_udp(data, len))
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else if (dis->proto==IPPROTO_UDP && proto_check_udp(data, len))
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{
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*udp = (struct udphdr *) data;
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*transport_len = len;
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dis->udp = (struct udphdr *) data;
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dis->transport_len = len;
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proto_skip_udp(&data, &len);
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*data_payload = data;
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*len_payload = len;
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dis->data_payload = data;
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dis->len_payload = len;
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}
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}
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@ -210,14 +210,20 @@ bool proto_check_tcp(const uint8_t *data, size_t len);
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void proto_skip_tcp(uint8_t **data, size_t *len);
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bool proto_check_udp(const uint8_t *data, size_t len);
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void proto_skip_udp(uint8_t **data, size_t *len);
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void proto_dissect_l3l4(
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uint8_t *data, size_t len,
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struct ip **ip, struct ip6_hdr **ip6,
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uint8_t *proto,
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struct tcphdr **tcp,
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struct udphdr **udp,
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size_t *transport_len,
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uint8_t **data_payload, size_t *len_payload);
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struct dissect
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{
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uint8_t *data_pkt;
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size_t len_pkt;
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struct ip *ip;
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struct ip6_hdr *ip6;
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uint8_t proto;
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struct tcphdr *tcp;
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struct udphdr *udp;
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size_t transport_len;
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uint8_t *data_payload;
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size_t len_payload;
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};
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void proto_dissect_l3l4(uint8_t *data, size_t len,struct dissect *dis);
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bool tcp_synack_segment(const struct tcphdr *tcphdr);
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bool tcp_syn_segment(const struct tcphdr *tcphdr);
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309
nfq/desync.c
309
nfq/desync.c
@ -618,12 +618,12 @@ static void autottl_discover(t_ctrack *ctrack, bool bIpv6)
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}
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}
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static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint32_t fwmark, const char *ifout, uint8_t *data_pkt, size_t *len_pkt, struct ip *ip, struct ip6_hdr *ip6hdr, struct tcphdr *tcphdr, size_t transport_len, uint8_t *data_payload, size_t len_payload)
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static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint32_t fwmark, const char *ifout, struct dissect *dis)
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{
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uint8_t verdict=VERDICT_PASS;
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// additional safety check
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if (!!ip == !!ip6hdr) return verdict;
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if (!!dis->ip == !!dis->ip6) return verdict;
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struct desync_profile *dp = NULL;
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@ -636,16 +636,16 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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uint8_t ttl_orig,ttl_fake,flags_orig,scale_factor;
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uint32_t *timestamps;
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ttl_orig = ip ? ip->ip_ttl : ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_hlim;
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ttl_orig = dis->ip ? dis->ip->ip_ttl : dis->ip6->ip6_ctlun.ip6_un1.ip6_un1_hlim;
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uint32_t desync_fwmark = fwmark | params.desync_fwmark;
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extract_endpoints(ip, ip6hdr, tcphdr, NULL, &src, &dst);
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extract_endpoints(dis->ip, dis->ip6, dis->tcp, NULL, &src, &dst);
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if (replay)
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{
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// in replay mode conntrack_replay is not NULL and ctrack is NULL
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//ConntrackPoolDump(¶ms.conntrack);
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if (!ConntrackPoolDoubleSearch(¶ms.conntrack, ip, ip6hdr, tcphdr, NULL, &ctrack_replay, &bReverse) || bReverse)
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if (!ConntrackPoolDoubleSearch(¶ms.conntrack, dis->ip, dis->ip6, dis->tcp, NULL, &ctrack_replay, &bReverse) || bReverse)
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return verdict;
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dp = ctrack_replay->dp;
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@ -667,7 +667,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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// in real mode ctrack may be NULL or not NULL, conntrack_replay is equal to ctrack
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ConntrackPoolPurge(¶ms.conntrack);
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if (ConntrackPoolFeed(¶ms.conntrack, ip, ip6hdr, tcphdr, NULL, len_payload, &ctrack, &bReverse))
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if (ConntrackPoolFeed(¶ms.conntrack, dis->ip, dis->ip6, dis->tcp, NULL, dis->len_payload, &ctrack, &bReverse))
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{
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dp = ctrack->dp;
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ctrack_replay = ctrack;
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@ -694,9 +694,9 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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//ConntrackPoolDump(¶ms.conntrack);
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if (dp->wsize && tcp_synack_segment(tcphdr))
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if (dp->wsize && tcp_synack_segment(dis->tcp))
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{
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tcp_rewrite_winsize(tcphdr, dp->wsize, dp->wscale);
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tcp_rewrite_winsize(dis->tcp, dp->wsize, dp->wscale);
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verdict=VERDICT_MODIFY;
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}
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@ -709,7 +709,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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DLOG("incoming TTL %u\n",ttl_orig);
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ctrack->incoming_ttl = ttl_orig;
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}
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if (!ctrack->autottl) autottl_discover(ctrack,!!ip6hdr);
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if (!ctrack->autottl) autottl_discover(ctrack,!!dis->ip6);
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}
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// process reply packets for auto hostlist mode
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@ -725,18 +725,18 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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else
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*client_ip_port=0;
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if (tcphdr->th_flags & TH_RST)
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if (dis->tcp->th_flags & TH_RST)
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{
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DLOG("incoming RST detected for hostname %s\n", ctrack->hostname);
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HOSTLIST_DEBUGLOG_APPEND("%s : profile %d : client %s : proto %s : incoming RST", ctrack->hostname, ctrack->dp->n, client_ip_port, l7proto_str(ctrack->l7proto));
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bFail = true;
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}
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else if (len_payload && ctrack->l7proto==HTTP)
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else if (dis->len_payload && ctrack->l7proto==HTTP)
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{
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if (IsHttpReply(data_payload,len_payload))
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if (IsHttpReply(dis->data_payload,dis->len_payload))
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{
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DLOG("incoming HTTP reply detected for hostname %s\n", ctrack->hostname);
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bFail = HttpReplyLooksLikeDPIRedirect(data_payload, len_payload, ctrack->hostname);
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bFail = HttpReplyLooksLikeDPIRedirect(dis->data_payload, dis->len_payload, ctrack->hostname);
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if (bFail)
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{
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DLOG("redirect to another domain detected. possibly DPI redirect.\n");
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@ -754,9 +754,9 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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if (bFail)
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auto_hostlist_failed(dp, ctrack->hostname, client_ip_port, ctrack->l7proto);
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else
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if (len_payload)
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if (dis->len_payload)
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auto_hostlist_reset_fail_counter(dp, ctrack->hostname, client_ip_port, ctrack->l7proto);
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if (tcphdr->th_flags & TH_RST)
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if (dis->tcp->th_flags & TH_RST)
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ConntrackClearHostname(ctrack); // do not react to further dup RSTs
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}
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@ -774,7 +774,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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else
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{
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if (dp->wssize_cutoff) DLOG("wssize-cutoff not reached (mode %c): %llu/%u\n", dp->wssize_cutoff_mode, (unsigned long long)cutoff_get_limit(ctrack,dp->wssize_cutoff_mode), dp->wssize_cutoff);
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tcp_rewrite_winsize(tcphdr, dp->wssize, dp->wsscale);
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tcp_rewrite_winsize(dis->tcp, dp->wssize, dp->wsscale);
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verdict=VERDICT_MODIFY;
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}
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}
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@ -785,24 +785,24 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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}
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} // !replay
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ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (ip6hdr ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
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flags_orig = *((uint8_t*)tcphdr+13);
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scale_factor = tcp_find_scale_factor(tcphdr);
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timestamps = tcp_find_timestamps(tcphdr);
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ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (dis->ip6 ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
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flags_orig = *((uint8_t*)dis->tcp+13);
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scale_factor = tcp_find_scale_factor(dis->tcp);
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timestamps = tcp_find_timestamps(dis->tcp);
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if (!replay)
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{
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// start and cutoff limiters
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if (!process_desync_interval(dp, ctrack)) return verdict;
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if (tcp_syn_segment(tcphdr))
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if (tcp_syn_segment(dis->tcp))
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{
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switch (dp->desync_mode0)
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{
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case DESYNC_SYNACK:
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pkt1_len = sizeof(pkt1);
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if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_SYN|TH_ACK, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
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ttl_fake,IP4_TOS(ip),IP6_FLOW(ip6hdr),
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if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_SYN|TH_ACK, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
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ttl_fake,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
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dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
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NULL, 0, pkt1, &pkt1_len))
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{
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@ -814,19 +814,19 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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break;
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case DESYNC_SYNDATA:
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// make sure we are not breaking TCP fast open
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if (tcp_has_fastopen(tcphdr))
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if (tcp_has_fastopen(dis->tcp))
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{
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DLOG("received SYN with TCP fast open option. syndata desync is not applied.\n");
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break;
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}
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if (len_payload)
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if (dis->len_payload)
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{
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DLOG("received SYN with data payload. syndata desync is not applied.\n");
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break;
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}
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pkt1_len = sizeof(pkt1);
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if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
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ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
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if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
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ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
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0,0,0, dp->fake_syndata,dp->fake_syndata_size, pkt1,&pkt1_len))
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{
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return verdict;
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@ -835,7 +835,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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hexdump_limited_dlog(dp->fake_syndata,dp->fake_syndata_size,PKTDATA_MAXDUMP); DLOG("\n");
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if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
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return verdict;
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verdict = ct_new_postnat_fix_tcp(ctrack, ip, ip6hdr, tcphdr);
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verdict = ct_new_postnat_fix_tcp(ctrack, dis->ip, dis->ip6, dis->tcp);
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break;
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default:
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break;
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@ -846,15 +846,15 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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} // !replay
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if (!(tcphdr->th_flags & TH_SYN) && len_payload)
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if (!(dis->tcp->th_flags & TH_SYN) && dis->len_payload)
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{
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const uint8_t *fake;
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size_t fake_size;
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char host[256];
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bool bHaveHost=false;
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uint8_t *p, *phost=NULL;
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const uint8_t *rdata_payload = data_payload;
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size_t rlen_payload = len_payload;
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const uint8_t *rdata_payload = dis->data_payload;
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size_t rlen_payload = dis->len_payload;
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size_t split_pos;
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t_l7proto l7proto = UNKNOWN;
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@ -863,7 +863,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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rdata_payload = ctrack_replay->reasm_orig.packet;
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rlen_payload = ctrack_replay->reasm_orig.size_present;
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}
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else if (reasm_orig_feed(ctrack,IPPROTO_TCP,data_payload,len_payload))
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else if (reasm_orig_feed(ctrack,IPPROTO_TCP,dis->data_payload,dis->len_payload))
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{
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rdata_payload = ctrack->reasm_orig.packet;
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rlen_payload = ctrack->reasm_orig.size_present;
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@ -915,7 +915,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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!(ctrack->req_seq_finalized && seq_within(ctrack->seq_last, ctrack->req_seq_start, ctrack->req_seq_end)))
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{
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// do not reconstruct unexpected large payload (they are feeding garbage ?)
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if (!reasm_orig_start(ctrack,IPPROTO_TCP,TLSRecordLen(data_payload),16384,data_payload,len_payload))
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if (!reasm_orig_start(ctrack,IPPROTO_TCP,TLSRecordLen(dis->data_payload),16384,dis->data_payload,dis->len_payload))
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{
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reasm_orig_cancel(ctrack);
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return verdict;
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@ -939,8 +939,8 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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if (!ReasmIsEmpty(&ctrack->reasm_orig))
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{
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verdict_tcp_csum_fix(verdict, tcphdr, transport_len, ip, ip6hdr);
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if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, data_pkt, *len_pkt, len_payload))
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verdict_tcp_csum_fix(verdict, dis->tcp, dis->transport_len, dis->ip, dis->ip6);
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if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, dis->data_pkt, dis->len_pkt, dis->len_payload))
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{
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DLOG("DELAY desync until reasm is complete (#%u)\n", rawpacket_queue_count(&ctrack->delayed));
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}
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@ -1025,7 +1025,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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{
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DLOG("desync profile changed by revealed l7 protocol or hostname !\n");
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// rediscover autottl
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autottl_discover(ctrack_replay,!!ip6hdr);
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autottl_discover(ctrack_replay,!!dis->ip6);
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// re-evaluate start/cutoff limiters
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if (!replay)
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{
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@ -1099,8 +1099,8 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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DLOG("applying tampering to unknown protocol\n");
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}
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ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (ip6hdr ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
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if ((l7proto == HTTP) && (dp->hostcase || dp->hostnospace || dp->domcase) && HttpFindHost(&phost,data_payload,len_payload))
|
||||
ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (dis->ip6 ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
|
||||
if ((l7proto == HTTP) && (dp->hostcase || dp->hostnospace || dp->domcase) && HttpFindHost(&phost,dis->data_payload,dis->len_payload))
|
||||
{
|
||||
if (dp->hostcase)
|
||||
{
|
||||
@ -1111,14 +1111,14 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (dp->domcase)
|
||||
{
|
||||
DLOG("mixing domain case\n");
|
||||
for (p = phost+5; p < (data_payload + len_payload) && *p != '\r' && *p != '\n'; p++)
|
||||
for (p = phost+5; p < (dis->data_payload + dis->len_payload) && *p != '\r' && *p != '\n'; p++)
|
||||
*p = (((size_t)p) & 1) ? tolower(*p) : toupper(*p);
|
||||
verdict=VERDICT_MODIFY;
|
||||
}
|
||||
uint8_t *pua;
|
||||
if (dp->hostnospace &&
|
||||
(pua = (uint8_t*)memmem(data_payload, len_payload, "\r\nUser-Agent: ", 14)) &&
|
||||
(pua = (uint8_t*)memmem(pua + 1, len_payload - (pua - data_payload) - 1, "\r\n", 2)))
|
||||
(pua = (uint8_t*)memmem(dis->data_payload, dis->len_payload, "\r\nUser-Agent: ", 14)) &&
|
||||
(pua = (uint8_t*)memmem(pua + 1, dis->len_payload - (pua - dis->data_payload) - 1, "\r\n", 2)))
|
||||
{
|
||||
DLOG("removing space after Host: and adding it to User-Agent:\n");
|
||||
if (pua > phost)
|
||||
@ -1146,7 +1146,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
}
|
||||
|
||||
if (!split_pos || split_pos>rlen_payload) split_pos=1;
|
||||
split_pos=pos_normalize(split_pos,reasm_offset,len_payload);
|
||||
split_pos=pos_normalize(split_pos,reasm_offset,dis->len_payload);
|
||||
|
||||
enum dpi_desync_mode desync_mode = dp->desync_mode;
|
||||
uint32_t fooling_orig = FOOL_NONE;
|
||||
@ -1169,8 +1169,8 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
}
|
||||
case DESYNC_FAKE:
|
||||
if (reasm_offset) break;
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
fake, fake_size, pkt1, &pkt1_len))
|
||||
{
|
||||
@ -1183,8 +1183,8 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
case DESYNC_RST:
|
||||
case DESYNC_RSTACK:
|
||||
if (reasm_offset) break;
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_RST | (desync_mode==DESYNC_RSTACK ? TH_ACK:0), tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, TH_RST | (desync_mode==DESYNC_RSTACK ? TH_ACK:0), dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
NULL, 0, pkt1, &pkt1_len))
|
||||
{
|
||||
@ -1198,13 +1198,13 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
case DESYNC_IPFRAG1:
|
||||
fooling_orig = (desync_mode==DESYNC_HOPBYHOP) ? FOOL_HOPBYHOP : (desync_mode==DESYNC_DESTOPT) ? FOOL_DESTOPT : FOOL_IPFRAG1;
|
||||
desync_mode = dp->desync_mode2;
|
||||
if (ip6hdr && (desync_mode==DESYNC_NONE || !desync_valid_second_stage_tcp(desync_mode) ||
|
||||
if (dis->ip6 && (desync_mode==DESYNC_NONE || !desync_valid_second_stage_tcp(desync_mode) ||
|
||||
(!split_pos && (desync_mode==DESYNC_SPLIT || desync_mode==DESYNC_SPLIT2 || desync_mode==DESYNC_DISORDER || desync_mode==DESYNC_DISORDER2))))
|
||||
{
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
fooling_orig,0,0,
|
||||
data_payload, len_payload, pkt1, &pkt1_len))
|
||||
dis->data_payload, dis->len_payload, pkt1, &pkt1_len))
|
||||
{
|
||||
return verdict;
|
||||
}
|
||||
@ -1225,9 +1225,9 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
return verdict;
|
||||
if (dp->desync_mode2==DESYNC_NONE || !desync_valid_second_stage_tcp(dp->desync_mode2))
|
||||
{
|
||||
DLOG("reinjecting original packet. len=%zu len_payload=%zu\n", *len_pkt, len_payload);
|
||||
verdict_tcp_csum_fix(verdict, tcphdr, transport_len, ip, ip6hdr);
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , data_pkt, *len_pkt))
|
||||
DLOG("reinjecting original packet. len=%zu len_payload=%zu\n", dis->len_pkt, dis->len_payload);
|
||||
verdict_tcp_csum_fix(verdict, dis->tcp, dis->transport_len, dis->ip, dis->ip6);
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , dis->data_pkt, dis->len_pkt))
|
||||
return verdict;
|
||||
return VERDICT_DROP;
|
||||
}
|
||||
@ -1250,32 +1250,32 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
return verdict;
|
||||
}
|
||||
|
||||
if (split_pos<len_payload)
|
||||
if (split_pos<dis->len_payload)
|
||||
{
|
||||
if (dp->desync_seqovl)
|
||||
{
|
||||
seg_len = len_payload-split_pos+dp->desync_seqovl;
|
||||
seg_len = dis->len_payload-split_pos+dp->desync_seqovl;
|
||||
if (seg_len>sizeof(fakeseg))
|
||||
{
|
||||
DLOG("seqovl is too large\n");
|
||||
return verdict;
|
||||
}
|
||||
fill_pattern(fakeseg,dp->desync_seqovl,dp->seqovl_pattern,sizeof(dp->seqovl_pattern));
|
||||
memcpy(fakeseg+dp->desync_seqovl,data_payload+split_pos,len_payload-split_pos);
|
||||
memcpy(fakeseg+dp->desync_seqovl,dis->data_payload+split_pos,dis->len_payload-split_pos);
|
||||
seg = fakeseg;
|
||||
}
|
||||
else
|
||||
{
|
||||
seg = data_payload+split_pos;
|
||||
seg_len = len_payload-split_pos;
|
||||
seg = dis->data_payload+split_pos;
|
||||
seg_len = dis->len_payload-split_pos;
|
||||
}
|
||||
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, net32_add(net32_add(tcphdr->th_seq,split_pos),-dp->desync_seqovl), tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, net32_add(net32_add(dis->tcp->th_seq,split_pos),-dp->desync_seqovl), dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
fooling_orig,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
seg, seg_len, pkt1, &pkt1_len))
|
||||
return verdict;
|
||||
DLOG("sending 2nd out-of-order tcp segment %zu-%zu len=%zu seqovl=%u : ",split_pos,len_payload-1, len_payload-split_pos, dp->desync_seqovl);
|
||||
DLOG("sending 2nd out-of-order tcp segment %zu-%zu len=%zu seqovl=%u : ",split_pos,dis->len_payload-1, dis->len_payload-split_pos, dp->desync_seqovl);
|
||||
hexdump_limited_dlog(seg,seg_len,PKTDATA_MAXDUMP); DLOG("\n");
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
@ -1285,8 +1285,8 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (desync_mode==DESYNC_DISORDER)
|
||||
{
|
||||
seg_len = sizeof(fakeseg);
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
zeropkt, split_pos, fakeseg, &seg_len))
|
||||
return verdict;
|
||||
@ -1297,13 +1297,13 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
}
|
||||
|
||||
pkt1_len = sizeof(pkt1);
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
fooling_orig,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
data_payload, split_pos, pkt1, &pkt1_len))
|
||||
dis->data_payload, split_pos, pkt1, &pkt1_len))
|
||||
return verdict;
|
||||
DLOG("sending 1st out-of-order tcp segment 0-%zu len=%zu : ",split_pos-1, split_pos);
|
||||
hexdump_limited_dlog(data_payload,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
|
||||
hexdump_limited_dlog(dis->data_payload,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
|
||||
@ -1328,8 +1328,8 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (desync_mode==DESYNC_SPLIT)
|
||||
{
|
||||
fakeseg_len = sizeof(fakeseg);
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, tcphdr->th_seq, tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, dis->tcp->th_seq, dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_fake,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
zeropkt, split_pos, fakeseg, &fakeseg_len))
|
||||
return verdict;
|
||||
@ -1348,17 +1348,17 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
return verdict;
|
||||
}
|
||||
fill_pattern(ovlseg,dp->desync_seqovl,dp->seqovl_pattern,sizeof(dp->seqovl_pattern));
|
||||
memcpy(ovlseg+dp->desync_seqovl,data_payload,split_pos);
|
||||
memcpy(ovlseg+dp->desync_seqovl,dis->data_payload,split_pos);
|
||||
seg = ovlseg;
|
||||
}
|
||||
else
|
||||
{
|
||||
seg = data_payload;
|
||||
seg = dis->data_payload;
|
||||
seg_len = split_pos;
|
||||
}
|
||||
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, net32_add(tcphdr->th_seq,-dp->desync_seqovl), tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, net32_add(dis->tcp->th_seq,-dp->desync_seqovl), dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
fooling_orig,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
seg, seg_len, pkt1, &pkt1_len))
|
||||
return verdict;
|
||||
@ -1374,16 +1374,16 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, fakeseg_len))
|
||||
return verdict;
|
||||
}
|
||||
if (split_pos<len_payload)
|
||||
if (split_pos<dis->len_payload)
|
||||
{
|
||||
pkt1_len = sizeof(pkt1);
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, net32_add(tcphdr->th_seq,split_pos), tcphdr->th_ack, tcphdr->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
if (!prepare_tcp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, flags_orig, net32_add(dis->tcp->th_seq,split_pos), dis->tcp->th_ack, dis->tcp->th_win, scale_factor, timestamps,
|
||||
ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
fooling_orig,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
|
||||
data_payload+split_pos, len_payload-split_pos, pkt1, &pkt1_len))
|
||||
dis->data_payload+split_pos, dis->len_payload-split_pos, pkt1, &pkt1_len))
|
||||
return verdict;
|
||||
DLOG("sending 2nd tcp segment %zu-%zu len=%zu : ",split_pos,len_payload-1, len_payload-split_pos);
|
||||
hexdump_limited_dlog(data_payload+split_pos,len_payload-split_pos,PKTDATA_MAXDUMP); DLOG("\n");
|
||||
DLOG("sending 2nd tcp segment %zu-%zu len=%zu : ",split_pos,dis->len_payload-1, dis->len_payload-split_pos);
|
||||
hexdump_limited_dlog(dis->data_payload+split_pos,dis->len_payload-split_pos,PKTDATA_MAXDUMP); DLOG("\n");
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
}
|
||||
@ -1394,28 +1394,28 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
case DESYNC_IPFRAG2:
|
||||
if (!reasm_offset)
|
||||
{
|
||||
verdict_tcp_csum_fix(verdict, tcphdr, transport_len, ip, ip6hdr);
|
||||
verdict_tcp_csum_fix(verdict, dis->tcp, dis->transport_len, dis->ip, dis->ip6);
|
||||
|
||||
uint8_t pkt3[DPI_DESYNC_MAX_FAKE_LEN+100], *pkt_orig;
|
||||
size_t pkt_orig_len;
|
||||
|
||||
size_t ipfrag_pos = (dp->desync_ipfrag_pos_tcp && dp->desync_ipfrag_pos_tcp<transport_len) ? dp->desync_ipfrag_pos_tcp : 24;
|
||||
uint32_t ident = ip ? ip->ip_id ? ip->ip_id : htons(1+random()%0xFFFF) : htonl(1+random()%0xFFFFFFFF);
|
||||
size_t ipfrag_pos = (dp->desync_ipfrag_pos_tcp && dp->desync_ipfrag_pos_tcp<dis->transport_len) ? dp->desync_ipfrag_pos_tcp : 24;
|
||||
uint32_t ident = dis->ip ? dis->ip->ip_id ? dis->ip->ip_id : htons(1+random()%0xFFFF) : htonl(1+random()%0xFFFFFFFF);
|
||||
|
||||
pkt1_len = sizeof(pkt1);
|
||||
pkt2_len = sizeof(pkt2);
|
||||
|
||||
if (ip6hdr && (fooling_orig==FOOL_HOPBYHOP || fooling_orig==FOOL_DESTOPT))
|
||||
if (dis->ip6 && (fooling_orig==FOOL_HOPBYHOP || fooling_orig==FOOL_DESTOPT))
|
||||
{
|
||||
pkt_orig_len = sizeof(pkt3);
|
||||
if (!ip6_insert_simple_hdr(fooling_orig==FOOL_HOPBYHOP ? IPPROTO_HOPOPTS : IPPROTO_DSTOPTS, data_pkt, *len_pkt, pkt3, &pkt_orig_len))
|
||||
if (!ip6_insert_simple_hdr(fooling_orig==FOOL_HOPBYHOP ? IPPROTO_HOPOPTS : IPPROTO_DSTOPTS, dis->data_pkt, dis->len_pkt, pkt3, &pkt_orig_len))
|
||||
return verdict;
|
||||
pkt_orig = pkt3;
|
||||
}
|
||||
else
|
||||
{
|
||||
pkt_orig = data_pkt;
|
||||
pkt_orig_len = *len_pkt;
|
||||
pkt_orig = dis->data_pkt;
|
||||
pkt_orig_len = dis->len_pkt;
|
||||
}
|
||||
|
||||
if (!ip_frag(pkt_orig, pkt_orig_len, ipfrag_pos, ident, pkt1, &pkt1_len, pkt2, &pkt2_len))
|
||||
@ -1426,7 +1426,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
|
||||
DLOG("sending 2nd ip fragment %zu-%zu ip_payload_len=%zu : ", ipfrag_pos, transport_len-1, transport_len-ipfrag_pos);
|
||||
DLOG("sending 2nd ip fragment %zu-%zu ip_payload_len=%zu : ", ipfrag_pos, dis->transport_len-1, dis->transport_len-ipfrag_pos);
|
||||
hexdump_limited_dlog(pkt2,pkt2_len,IP_MAXDUMP); DLOG("\n");
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt2, pkt2_len))
|
||||
return verdict;
|
||||
@ -1458,12 +1458,12 @@ static bool quic_reasm_cancel(t_ctrack *ctrack, const char *reason)
|
||||
}
|
||||
}
|
||||
|
||||
static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint32_t fwmark, const char *ifout, uint8_t *data_pkt, size_t *len_pkt, struct ip *ip, struct ip6_hdr *ip6hdr, struct udphdr *udphdr, size_t transport_len, uint8_t *data_payload, size_t len_payload)
|
||||
static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint32_t fwmark, const char *ifout, struct dissect *dis)
|
||||
{
|
||||
uint8_t verdict=VERDICT_PASS;
|
||||
|
||||
// additional safety check
|
||||
if (!!ip == !!ip6hdr) return verdict;
|
||||
if (!!dis->ip == !!dis->ip6) return verdict;
|
||||
|
||||
// no need to desync middle packets in reasm session
|
||||
if (reasm_offset) return verdict;
|
||||
@ -1479,15 +1479,15 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
uint8_t ttl_orig,ttl_fake;
|
||||
t_l7proto l7proto = UNKNOWN;
|
||||
|
||||
ttl_orig = ip ? ip->ip_ttl : ip6hdr->ip6_ctlun.ip6_un1.ip6_un1_hlim;
|
||||
extract_endpoints(ip, ip6hdr, NULL, udphdr, &src, &dst);
|
||||
ttl_orig = dis->ip ? dis->ip->ip_ttl : dis->ip6->ip6_ctlun.ip6_un1.ip6_un1_hlim;
|
||||
extract_endpoints(dis->ip, dis->ip6, NULL, dis->udp, &src, &dst);
|
||||
|
||||
if (replay)
|
||||
{
|
||||
// in replay mode conntrack_replay is not NULL and ctrack is NULL
|
||||
|
||||
//ConntrackPoolDump(¶ms.conntrack);
|
||||
if (!ConntrackPoolDoubleSearch(¶ms.conntrack, ip, ip6hdr, NULL, udphdr, &ctrack_replay, &bReverse) || bReverse)
|
||||
if (!ConntrackPoolDoubleSearch(¶ms.conntrack, dis->ip, dis->ip6, NULL, dis->udp, &ctrack_replay, &bReverse) || bReverse)
|
||||
return verdict;
|
||||
|
||||
dp = ctrack_replay->dp;
|
||||
@ -1509,7 +1509,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
// in real mode ctrack may be NULL or not NULL, conntrack_replay is equal to ctrack
|
||||
|
||||
ConntrackPoolPurge(¶ms.conntrack);
|
||||
if (ConntrackPoolFeed(¶ms.conntrack, ip, ip6hdr, NULL, udphdr, len_payload, &ctrack, &bReverse))
|
||||
if (ConntrackPoolFeed(¶ms.conntrack, dis->ip, dis->ip6, NULL, dis->udp, dis->len_payload, &ctrack, &bReverse))
|
||||
{
|
||||
dp = ctrack->dp;
|
||||
ctrack_replay = ctrack;
|
||||
@ -1543,7 +1543,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
DLOG("incoming TTL %u\n",ttl_orig);
|
||||
ctrack->incoming_ttl = ttl_orig;
|
||||
}
|
||||
if (!ctrack->autottl) autottl_discover(ctrack,!!ip6hdr);
|
||||
if (!ctrack->autottl) autottl_discover(ctrack,!!dis->ip6);
|
||||
return verdict; // nothing to do. do not waste cpu
|
||||
}
|
||||
|
||||
@ -1552,7 +1552,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
|
||||
uint32_t desync_fwmark = fwmark | params.desync_fwmark;
|
||||
|
||||
if (len_payload)
|
||||
if (dis->len_payload)
|
||||
{
|
||||
const uint8_t *fake;
|
||||
size_t fake_size;
|
||||
@ -1560,7 +1560,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
char host[256];
|
||||
bool bHaveHost=false;
|
||||
|
||||
if (IsQUICInitial(data_payload,len_payload))
|
||||
if (IsQUICInitial(dis->data_payload,dis->len_payload))
|
||||
{
|
||||
DLOG("packet contains QUIC initial\n");
|
||||
l7proto = QUIC;
|
||||
@ -1577,7 +1577,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
else
|
||||
{
|
||||
clean_len = sizeof(clean);
|
||||
pclean = QUICDecryptInitial(data_payload,len_payload,clean,&clean_len) ? clean : NULL;
|
||||
pclean = QUICDecryptInitial(dis->data_payload,dis->len_payload,clean,&clean_len) ? clean : NULL;
|
||||
}
|
||||
if (pclean)
|
||||
{
|
||||
@ -1619,8 +1619,8 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
}
|
||||
if (!ReasmIsEmpty(&ctrack->reasm_orig))
|
||||
{
|
||||
verdict_udp_csum_fix(verdict, udphdr, transport_len, ip, ip6hdr);
|
||||
if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, data_pkt, *len_pkt, len_payload))
|
||||
verdict_udp_csum_fix(verdict, dis->udp, dis->transport_len, dis->ip, dis->ip6);
|
||||
if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, dis->data_pkt, dis->len_pkt, dis->len_payload))
|
||||
{
|
||||
DLOG("DELAY desync until reasm is complete (#%u)\n", rawpacket_queue_count(&ctrack->delayed));
|
||||
}
|
||||
@ -1635,7 +1635,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
replay_queue(&ctrack->delayed);
|
||||
reasm_orig_fin(ctrack);
|
||||
}
|
||||
return ct_new_postnat_fix_udp(ctrack, ip, ip6hdr, udphdr, len_pkt);
|
||||
return ct_new_postnat_fix_udp(ctrack, dis->ip, dis->ip6, dis->udp, &dis->len_pkt);
|
||||
}
|
||||
}
|
||||
|
||||
@ -1673,13 +1673,13 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
|
||||
reasm_orig_cancel(ctrack);
|
||||
|
||||
if (IsWireguardHandshakeInitiation(data_payload,len_payload))
|
||||
if (IsWireguardHandshakeInitiation(dis->data_payload,dis->len_payload))
|
||||
{
|
||||
DLOG("packet contains wireguard handshake initiation\n");
|
||||
l7proto = WIREGUARD;
|
||||
if (ctrack && ctrack->l7proto==UNKNOWN) ctrack->l7proto = l7proto;
|
||||
}
|
||||
else if (IsDhtD1(data_payload,len_payload))
|
||||
else if (IsDhtD1(dis->data_payload,dis->len_payload))
|
||||
{
|
||||
DLOG("packet contains DHT d1...e\n");
|
||||
l7proto = DHT;
|
||||
@ -1746,7 +1746,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
{
|
||||
DLOG("desync profile changed by revealed l7 protocol or hostname !\n");
|
||||
// rediscover autottl
|
||||
autottl_discover(ctrack_replay,!!ip6hdr);
|
||||
autottl_discover(ctrack_replay,!!dis->ip6);
|
||||
// re-evaluate start/cutoff limiters
|
||||
if (!replay)
|
||||
{
|
||||
@ -1806,7 +1806,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
break;
|
||||
}
|
||||
|
||||
ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (ip6hdr ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
|
||||
ttl_fake = (ctrack_replay && ctrack_replay->autottl) ? ctrack_replay->autottl : (dis->ip6 ? (dp->desync_ttl6 ? dp->desync_ttl6 : ttl_orig) : (dp->desync_ttl ? dp->desync_ttl : ttl_orig));
|
||||
|
||||
enum dpi_desync_mode desync_mode = dp->desync_mode;
|
||||
uint32_t fooling_orig = FOOL_NONE;
|
||||
@ -1831,7 +1831,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
break;
|
||||
}
|
||||
case DESYNC_FAKE:
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, ttl_fake, IP4_TOS(ip),IP6_FLOW(ip6hdr), dp->desync_fooling_mode, NULL, 0, 0, fake, fake_size, pkt1, &pkt1_len))
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, ttl_fake, IP4_TOS(dis->ip),IP6_FLOW(dis->ip6), dp->desync_fooling_mode, NULL, 0, 0, fake, fake_size, pkt1, &pkt1_len))
|
||||
return verdict;
|
||||
DLOG("sending fake request : ");
|
||||
hexdump_limited_dlog(fake,fake_size,PKTDATA_MAXDUMP); DLOG("\n");
|
||||
@ -1843,12 +1843,12 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
case DESYNC_DESTOPT:
|
||||
case DESYNC_IPFRAG1:
|
||||
fooling_orig = (desync_mode==DESYNC_HOPBYHOP) ? FOOL_HOPBYHOP : (desync_mode==DESYNC_DESTOPT) ? FOOL_DESTOPT : FOOL_IPFRAG1;
|
||||
if (ip6hdr && (dp->desync_mode2==DESYNC_NONE || !desync_valid_second_stage_udp(dp->desync_mode2)))
|
||||
if (dis->ip6 && (dp->desync_mode2==DESYNC_NONE || !desync_valid_second_stage_udp(dp->desync_mode2)))
|
||||
{
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst,
|
||||
ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr),
|
||||
ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6),
|
||||
fooling_orig,NULL,0,0,
|
||||
data_payload, len_payload, pkt1, &pkt1_len))
|
||||
dis->data_payload, dis->len_payload, pkt1, &pkt1_len))
|
||||
{
|
||||
return verdict;
|
||||
}
|
||||
@ -1856,7 +1856,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
// this mode is final, no other options available
|
||||
return ct_new_postnat_fix_udp(ctrack, ip, ip6hdr, udphdr, len_pkt);
|
||||
return ct_new_postnat_fix_udp(ctrack, dis->ip, dis->ip6, dis->udp, &dis->len_pkt);
|
||||
}
|
||||
desync_mode = dp->desync_mode2;
|
||||
break;
|
||||
@ -1869,11 +1869,11 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
{
|
||||
if (dp->desync_mode2==DESYNC_NONE || !desync_valid_second_stage_udp(dp->desync_mode2))
|
||||
{
|
||||
DLOG("reinjecting original packet. len=%zu len_payload=%zu\n", *len_pkt, len_payload);
|
||||
verdict_udp_csum_fix(verdict, udphdr, transport_len, ip, ip6hdr);
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , data_pkt, *len_pkt))
|
||||
DLOG("reinjecting original packet. len=%zu len_payload=%zu\n", dis->len_pkt, dis->len_payload);
|
||||
verdict_udp_csum_fix(verdict, dis->udp, dis->transport_len, dis->ip, dis->ip6);
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , dis->data_pkt, dis->len_pkt))
|
||||
return verdict;
|
||||
return ct_new_postnat_fix_udp(ctrack, ip, ip6hdr, udphdr, len_pkt);
|
||||
return ct_new_postnat_fix_udp(ctrack, dis->ip, dis->ip6, dis->udp, &dis->len_pkt);
|
||||
}
|
||||
desync_mode = dp->desync_mode2;
|
||||
}
|
||||
@ -1882,7 +1882,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
{
|
||||
case DESYNC_UDPLEN:
|
||||
pkt1_len = sizeof(pkt1);
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr), fooling_orig, dp->udplen_pattern, sizeof(dp->udplen_pattern), dp->udplen_increment, data_payload, len_payload, pkt1, &pkt1_len))
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6), fooling_orig, dp->udplen_pattern, sizeof(dp->udplen_pattern), dp->udplen_increment, dis->data_payload, dis->len_payload, pkt1, &pkt1_len))
|
||||
{
|
||||
DLOG("could not construct packet with modified length. too large ?\n");
|
||||
return verdict;
|
||||
@ -1890,24 +1890,24 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
DLOG("resending original packet with increased by %d length\n", dp->udplen_increment);
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
return ct_new_postnat_fix_udp(ctrack, ip, ip6hdr, udphdr, len_pkt);
|
||||
return ct_new_postnat_fix_udp(ctrack, dis->ip, dis->ip6, dis->udp, &dis->len_pkt);
|
||||
case DESYNC_TAMPER:
|
||||
if (IsDhtD1(data_payload,len_payload))
|
||||
if (IsDhtD1(dis->data_payload,dis->len_payload))
|
||||
{
|
||||
size_t szbuf,szcopy;
|
||||
memcpy(pkt2,"d2:001:x",8);
|
||||
pkt2_len=8;
|
||||
szbuf=sizeof(pkt2)-pkt2_len;
|
||||
szcopy=len_payload-1;
|
||||
szcopy=dis->len_payload-1;
|
||||
if (szcopy>szbuf)
|
||||
{
|
||||
DLOG("packet is too long to tamper");
|
||||
return verdict;
|
||||
}
|
||||
memcpy(pkt2+pkt2_len,data_payload+1,szcopy);
|
||||
memcpy(pkt2+pkt2_len,dis->data_payload+1,szcopy);
|
||||
pkt2_len+=szcopy;
|
||||
pkt1_len = sizeof(pkt1);
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, ttl_orig,IP4_TOS(ip),IP6_FLOW(ip6hdr), fooling_orig, NULL, 0 , 0, pkt2, pkt2_len, pkt1, &pkt1_len))
|
||||
if (!prepare_udp_segment((struct sockaddr *)&src, (struct sockaddr *)&dst, ttl_orig,IP4_TOS(dis->ip),IP6_FLOW(dis->ip6), fooling_orig, NULL, 0 , 0, pkt2, pkt2_len, pkt1, &pkt1_len))
|
||||
{
|
||||
DLOG("could not construct packet with modified length. too large ?\n");
|
||||
return verdict;
|
||||
@ -1915,7 +1915,7 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
DLOG("resending tampered DHT\n");
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
return ct_new_postnat_fix_udp(ctrack, ip, ip6hdr, udphdr, len_pkt);
|
||||
return ct_new_postnat_fix_udp(ctrack, dis->ip, dis->ip6, dis->udp, &dis->len_pkt);
|
||||
}
|
||||
else
|
||||
{
|
||||
@ -1924,29 +1924,29 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
}
|
||||
case DESYNC_IPFRAG2:
|
||||
{
|
||||
verdict_udp_csum_fix(verdict, udphdr, transport_len, ip, ip6hdr);
|
||||
verdict_udp_csum_fix(verdict, dis->udp, dis->transport_len, dis->ip, dis->ip6);
|
||||
|
||||
uint8_t pkt3[DPI_DESYNC_MAX_FAKE_LEN+100], *pkt_orig;
|
||||
size_t pkt_orig_len;
|
||||
|
||||
size_t ipfrag_pos = (dp->desync_ipfrag_pos_udp && dp->desync_ipfrag_pos_udp<transport_len) ? dp->desync_ipfrag_pos_udp : sizeof(struct udphdr);
|
||||
size_t ipfrag_pos = (dp->desync_ipfrag_pos_udp && dp->desync_ipfrag_pos_udp<dis->transport_len) ? dp->desync_ipfrag_pos_udp : sizeof(struct udphdr);
|
||||
// freebsd do not set ip.id
|
||||
uint32_t ident = ip ? ip->ip_id ? ip->ip_id : htons(1+random()%0xFFFF) : htonl(1+random()%0xFFFFFFFF);
|
||||
uint32_t ident = dis->ip ? dis->ip->ip_id ? dis->ip->ip_id : htons(1+random()%0xFFFF) : htonl(1+random()%0xFFFFFFFF);
|
||||
|
||||
pkt1_len = sizeof(pkt1);
|
||||
pkt2_len = sizeof(pkt2);
|
||||
|
||||
if (ip6hdr && (fooling_orig==FOOL_HOPBYHOP || fooling_orig==FOOL_DESTOPT))
|
||||
if (dis->ip6 && (fooling_orig==FOOL_HOPBYHOP || fooling_orig==FOOL_DESTOPT))
|
||||
{
|
||||
pkt_orig_len = sizeof(pkt3);
|
||||
if (!ip6_insert_simple_hdr(fooling_orig==FOOL_HOPBYHOP ? IPPROTO_HOPOPTS : IPPROTO_DSTOPTS, data_pkt, *len_pkt, pkt3, &pkt_orig_len))
|
||||
if (!ip6_insert_simple_hdr(fooling_orig==FOOL_HOPBYHOP ? IPPROTO_HOPOPTS : IPPROTO_DSTOPTS, dis->data_pkt, dis->len_pkt, pkt3, &pkt_orig_len))
|
||||
return verdict;
|
||||
pkt_orig = pkt3;
|
||||
}
|
||||
else
|
||||
{
|
||||
pkt_orig = data_pkt;
|
||||
pkt_orig_len = *len_pkt;
|
||||
pkt_orig = dis->data_pkt;
|
||||
pkt_orig_len = dis->len_pkt;
|
||||
}
|
||||
|
||||
if (!ip_frag(pkt_orig, pkt_orig_len, ipfrag_pos, ident, pkt1, &pkt1_len, pkt2, &pkt2_len))
|
||||
@ -1957,12 +1957,12 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt1, pkt1_len))
|
||||
return verdict;
|
||||
|
||||
DLOG("sending 2nd ip fragment %zu-%zu ip_payload_len=%zu : ", ipfrag_pos, transport_len-1, transport_len-ipfrag_pos);
|
||||
DLOG("sending 2nd ip fragment %zu-%zu ip_payload_len=%zu : ", ipfrag_pos, dis->transport_len-1, dis->transport_len-ipfrag_pos);
|
||||
hexdump_limited_dlog(pkt2,pkt2_len,IP_MAXDUMP); DLOG("\n");
|
||||
if (!rawsend((struct sockaddr *)&dst, desync_fwmark, ifout , pkt2, pkt2_len))
|
||||
return verdict;
|
||||
|
||||
return ct_new_postnat_fix_udp(ctrack, ip, ip6hdr, udphdr, len_pkt);
|
||||
return ct_new_postnat_fix_udp(ctrack, dis->ip, dis->ip6, dis->udp, &dis->len_pkt);
|
||||
}
|
||||
default:
|
||||
break;
|
||||
@ -1974,37 +1974,37 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, size_t reasm_offset, uint
|
||||
}
|
||||
|
||||
|
||||
static void packet_debug(bool replay, uint8_t proto, const struct ip *ip, const struct ip6_hdr *ip6hdr, const struct tcphdr *tcphdr, const struct udphdr *udphdr, const uint8_t *data_payload, size_t len_payload)
|
||||
static void packet_debug(bool replay, const struct dissect *dis)
|
||||
{
|
||||
if (params.debug)
|
||||
{
|
||||
if (replay) DLOG("REPLAY ");
|
||||
if (ip)
|
||||
if (dis->ip)
|
||||
{
|
||||
char s[66];
|
||||
str_ip(s,sizeof(s),ip);
|
||||
str_ip(s,sizeof(s),dis->ip);
|
||||
DLOG("IP4: %s",s);
|
||||
}
|
||||
else if (ip6hdr)
|
||||
else if (dis->ip6)
|
||||
{
|
||||
char s[128];
|
||||
str_ip6hdr(s,sizeof(s),ip6hdr, proto);
|
||||
str_ip6hdr(s,sizeof(s),dis->ip6, dis->proto);
|
||||
DLOG("IP6: %s",s);
|
||||
}
|
||||
if (tcphdr)
|
||||
if (dis->tcp)
|
||||
{
|
||||
char s[80];
|
||||
str_tcphdr(s,sizeof(s),tcphdr);
|
||||
str_tcphdr(s,sizeof(s),dis->tcp);
|
||||
DLOG(" %s\n",s);
|
||||
if (len_payload) { DLOG("TCP: "); hexdump_limited_dlog(data_payload, len_payload, 32); DLOG("\n"); }
|
||||
if (dis->len_payload) { DLOG("TCP: "); hexdump_limited_dlog(dis->data_payload, dis->len_payload, 32); DLOG("\n"); }
|
||||
|
||||
}
|
||||
else if (udphdr)
|
||||
else if (dis->udp)
|
||||
{
|
||||
char s[30];
|
||||
str_udphdr(s,sizeof(s),udphdr);
|
||||
str_udphdr(s,sizeof(s),dis->udp);
|
||||
DLOG(" %s\n",s);
|
||||
if (len_payload) { DLOG("UDP: "); hexdump_limited_dlog(data_payload, len_payload, 32); DLOG("\n"); }
|
||||
if (dis->len_payload) { DLOG("UDP: "); hexdump_limited_dlog(dis->data_payload, dis->len_payload, 32); DLOG("\n"); }
|
||||
}
|
||||
else
|
||||
DLOG("\n");
|
||||
@ -2014,36 +2014,31 @@ static void packet_debug(bool replay, uint8_t proto, const struct ip *ip, const
|
||||
|
||||
static uint8_t dpi_desync_packet_play(bool replay, size_t reasm_offset, uint32_t fwmark, const char *ifout, uint8_t *data_pkt, size_t *len_pkt)
|
||||
{
|
||||
struct ip *ip;
|
||||
struct ip6_hdr *ip6hdr;
|
||||
struct tcphdr *tcphdr;
|
||||
struct udphdr *udphdr;
|
||||
size_t transport_len;
|
||||
uint8_t *data_payload,proto;
|
||||
size_t len_payload;
|
||||
struct dissect dis;
|
||||
uint8_t verdict = VERDICT_PASS;
|
||||
|
||||
proto_dissect_l3l4(data_pkt,*len_pkt,&ip,&ip6hdr,&proto,&tcphdr,&udphdr,&transport_len,&data_payload,&len_payload);
|
||||
if (!!ip != !!ip6hdr)
|
||||
proto_dissect_l3l4(data_pkt,*len_pkt,&dis);
|
||||
if (!!dis.ip != !!dis.ip6)
|
||||
{
|
||||
packet_debug(replay, proto, ip, ip6hdr, tcphdr, udphdr, data_payload, len_payload);
|
||||
switch(proto)
|
||||
packet_debug(replay, &dis);
|
||||
switch(dis.proto)
|
||||
{
|
||||
case IPPROTO_TCP:
|
||||
if (tcphdr)
|
||||
if (dis.tcp)
|
||||
{
|
||||
verdict = dpi_desync_tcp_packet_play(replay, reasm_offset, fwmark, ifout, data_pkt, len_pkt, ip, ip6hdr, tcphdr, transport_len, data_payload, len_payload);
|
||||
verdict_tcp_csum_fix(verdict, tcphdr, transport_len, ip, ip6hdr);
|
||||
verdict = dpi_desync_tcp_packet_play(replay, reasm_offset, fwmark, ifout, &dis);
|
||||
verdict_tcp_csum_fix(verdict, dis.tcp, dis.transport_len, dis.ip, dis.ip6);
|
||||
}
|
||||
break;
|
||||
case IPPROTO_UDP:
|
||||
if (udphdr)
|
||||
if (dis.udp)
|
||||
{
|
||||
verdict = dpi_desync_udp_packet_play(replay, reasm_offset, fwmark, ifout, data_pkt, len_pkt, ip, ip6hdr, udphdr, transport_len, data_payload, len_payload);
|
||||
verdict_udp_csum_fix(verdict, udphdr, transport_len, ip, ip6hdr);
|
||||
verdict = dpi_desync_udp_packet_play(replay, reasm_offset, fwmark, ifout, &dis);
|
||||
verdict_udp_csum_fix(verdict, dis.udp, dis.transport_len, dis.ip, dis.ip6);
|
||||
}
|
||||
break;
|
||||
}
|
||||
*len_pkt = dis.len_pkt;
|
||||
}
|
||||
return verdict;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user