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nfqws: allow only absolute positive values in seqovl for multisplit/fakedsplit

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bol-van 2024-11-15 21:51:35 +03:00
parent c48398871c
commit 7b850e2e0e
2 changed files with 20 additions and 5 deletions
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20
nfq/desync.c
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@ -1182,7 +1182,6 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
DLOG("all multisplit pos are outside of this packet\n");
}
}
seqovl_pos = ResolvePos(rdata_payload, rlen_payload, l7proto, &dp->seqovl);
}
else if (dp->desync_mode==DESYNC_FAKEDSPLIT || dp->desync_mode==DESYNC_FAKEDDISORDER || dp->desync_mode2==DESYNC_FAKEDSPLIT || dp->desync_mode2==DESYNC_FAKEDDISORDER)
{
@ -1204,15 +1203,26 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, size_t reasm_offset, uint
DLOG("normalized regular split pos : %zu\n",split_pos);
else
DLOG("regular split pos is outside of this packet\n");
seqovl_pos = ResolvePos(rdata_payload, rlen_payload, l7proto, &dp->seqovl);
}
else
{
multisplit_count=0;
split_pos = seqovl_pos = 0;
split_pos = 0;
}
seqovl_pos = pos_normalize(seqovl_pos,reasm_offset,dis->len_payload);
if (seqovl_pos) DLOG("normalized seqovl pos : %zu\n",seqovl_pos);
if (dp->desync_mode==DESYNC_FAKEDSPLIT || dp->desync_mode==DESYNC_MULTISPLIT || dp->desync_mode2==DESYNC_FAKEDSPLIT || dp->desync_mode2==DESYNC_MULTISPLIT)
{
// split seqovl only uses absolute positive values
seqovl_pos = dp->seqovl.marker==PM_ABS ? dp->seqovl.pos : 0;
if (seqovl_pos) DLOG("seqovl pos : %zu\n",seqovl_pos);
}
else if (dp->desync_mode==DESYNC_FAKEDDISORDER || dp->desync_mode==DESYNC_MULTIDISORDER || dp->desync_mode2==DESYNC_FAKEDDISORDER || dp->desync_mode2==DESYNC_MULTIDISORDER)
{
seqovl_pos = ResolvePos(rdata_payload, rlen_payload, l7proto, &dp->seqovl);
seqovl_pos = pos_normalize(seqovl_pos,reasm_offset,dis->len_payload);
if (seqovl_pos) DLOG("normalized seqovl pos : %zu\n",seqovl_pos);
}
else
seqovl_pos = 0;
// we do not need reasm buffer anymore
reasm_orig_cancel(ctrack);

5
nfq/nfqws.c
View File

@ -844,6 +844,11 @@ static void split_compat(struct desync_profile *dp)
dp->splits[dp->split_count].pos = 2;
dp->split_count++;
}
if ((dp->seqovl.marker!=PM_ABS || dp->seqovl.pos<0) && (dp->desync_mode==DESYNC_FAKEDSPLIT || dp->desync_mode==DESYNC_MULTISPLIT || dp->desync_mode2==DESYNC_FAKEDSPLIT || dp->desync_mode2==DESYNC_MULTISPLIT))
{
DLOG_ERR("split seqovl supports only absolute positive positions\n");
exit_clean(1);
}
}
static void SplitDebug(void)