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nfqws: customize fakedsplit pattern
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bol-van committed Dec 2, 2024
1 parent fc3912b commit f016e5a
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Showing 3 changed files with 133 additions and 109 deletions.
42 changes: 28 additions & 14 deletions nfq/desync.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1449,10 +1449,17 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
case DESYNC_FAKEDDISORDER:
if (split_pos)
{
uint8_t fakeseg[DPI_DESYNC_MAX_FAKE_LEN+100], fakeseg2[DPI_DESYNC_MAX_FAKE_LEN+100], *seg;
uint8_t fakeseg[DPI_DESYNC_MAX_FAKE_LEN+100], fakeseg2[DPI_DESYNC_MAX_FAKE_LEN+100], pat[DPI_DESYNC_MAX_FAKE_LEN], *seg;
size_t seg_len,fakeseg2_len;
unsigned int seqovl;

if (dis->len_payload>sizeof(pat))
{
DLOG("packet is too large\n");
return verdict;
}
fill_pattern(pat,dis->len_payload,dp->fsplit_pattern,sizeof(dp->fsplit_pattern));

ip_id = IP4_IP_ID_FIX(dis->ip);

if (seqovl_pos>=split_pos)
Expand Down Expand Up @@ -1485,11 +1492,11 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
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_fake,IP4_TOS(dis->ip),ip_id,IP6_FLOW(dis->ip6),
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
zeropkt, dis->len_payload-split_pos, fakeseg2, &fakeseg2_len))
pat+split_pos, dis->len_payload-split_pos, fakeseg2, &fakeseg2_len))
return verdict;
ip_id=IP4_IP_ID_PREV(ip_id);
DLOG("sending fake(1) 2nd out-of-order tcp segment %zu-%zu len=%zu : ",split_pos,dis->len_payload-1, dis->len_payload-split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat+split_pos,dis->len_payload-split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg2, fakeseg2_len))
return verdict;

Expand All @@ -1509,19 +1516,19 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
ip_id=IP4_IP_ID_PREV(ip_id);

DLOG("sending fake(2) 2nd out-of-order tcp segment %zu-%zu len=%zu : ",split_pos,dis->len_payload-1, dis->len_payload-split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat+split_pos,dis->len_payload-split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg2, fakeseg2_len))
return verdict;

seg_len = sizeof(fakeseg);
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),ip_id,IP6_FLOW(dis->ip6),
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
zeropkt, split_pos, fakeseg, &seg_len))
pat, split_pos, fakeseg, &seg_len))
return verdict;
ip_id=IP4_IP_ID_PREV(ip_id);
DLOG("sending fake(1) 1st out-of-order tcp segment 0-%zu len=%zu : ",split_pos-1, split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, seg_len))
return verdict;

Expand All @@ -1539,7 +1546,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint

if (dis->ip) ((struct ip*)fakeseg)->ip_id = ip_id;
DLOG("sending fake(2) 1st out-of-order tcp segment 0-%zu len=%zu : ",split_pos-1, split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, seg_len))
return verdict;

Expand All @@ -1549,20 +1556,27 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
case DESYNC_FAKEDSPLIT:
if (split_pos)
{
uint8_t fakeseg[DPI_DESYNC_MAX_FAKE_LEN+100],ovlseg[DPI_DESYNC_MAX_FAKE_LEN+100], *seg;
uint8_t fakeseg[DPI_DESYNC_MAX_FAKE_LEN+100],ovlseg[DPI_DESYNC_MAX_FAKE_LEN+100],pat[DPI_DESYNC_MAX_FAKE_LEN], *seg;
size_t fakeseg_len,seg_len;

if (dis->len_payload>sizeof(pat))
{
DLOG("packet is too large\n");
return verdict;
}
fill_pattern(pat,dis->len_payload,dp->fsplit_pattern,sizeof(dp->fsplit_pattern));

ip_id = IP4_IP_ID_FIX(dis->ip);

fakeseg_len = sizeof(fakeseg);
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),ip_id,IP6_FLOW(dis->ip6),
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
zeropkt, split_pos, fakeseg, &fakeseg_len))
pat, split_pos, fakeseg, &fakeseg_len))
return verdict;
ip_id=IP4_IP_ID_NEXT(ip_id);
DLOG("sending fake(1) 1st tcp segment 0-%zu len=%zu : ",split_pos-1, split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, fakeseg_len))
return verdict;

Expand Down Expand Up @@ -1617,19 +1631,19 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
if (dis->ip) ((struct ip*)fakeseg)->ip_id = ip_id;
ip_id=IP4_IP_ID_NEXT(ip_id);
DLOG("sending fake(2) 1st tcp segment 0-%zu len=%zu : ",split_pos-1, split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, fakeseg_len))
return verdict;

fakeseg_len = sizeof(fakeseg);
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_fake,IP4_TOS(dis->ip),ip_id,IP6_FLOW(dis->ip6),
dp->desync_fooling_mode,dp->desync_badseq_increment,dp->desync_badseq_ack_increment,
zeropkt, dis->len_payload-split_pos, fakeseg, &fakeseg_len))
pat+split_pos, dis->len_payload-split_pos, fakeseg, &fakeseg_len))
return verdict;
ip_id=IP4_IP_ID_NEXT(ip_id);
DLOG("sending fake(1) 2nd tcp segment %zu-%zu len=%zu : ",split_pos,dis->len_payload-1, dis->len_payload-split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat+split_pos,dis->len_payload-split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, fakeseg_len))
return verdict;

Expand All @@ -1648,7 +1662,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
if (dis->ip) ((struct ip*)fakeseg)->ip_id = ip_id;

DLOG("sending fake(2) 2nd tcp segment %zu-%zu len=%zu : ",split_pos,dis->len_payload-1, dis->len_payload-split_pos);
hexdump_limited_dlog(zeropkt,split_pos,PKTDATA_MAXDUMP); DLOG("\n");
hexdump_limited_dlog(pat+split_pos,dis->len_payload-split_pos,PKTDATA_MAXDUMP); DLOG("\n");
if (!rawsend_rep(dp->desync_repeats,(struct sockaddr *)&dst, desync_fwmark, ifout , fakeseg, fakeseg_len))
return verdict;

Expand Down
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