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nfqws: split-http-req,split-tls

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bol-van 2024-06-18 17:39:06 +03:00
parent d43d88b9d0
commit dcf6bf8cc7
7 changed files with 263 additions and 100 deletions
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91
nfq/desync.c
View File

@ -437,7 +437,27 @@ static bool process_desync_interval(t_ctrack *ctrack)
static bool replay_queue(struct rawpacket_tailhead *q);
static uint8_t dpi_desync_tcp_packet_play(bool replay, 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)
static size_t pos_normalize(size_t split_pos, size_t reasm_offset, size_t len_payload)
{
size_t rsplit_pos = split_pos;
// normalize split pos to current packet
split_pos=(split_pos>reasm_offset && (split_pos-reasm_offset)<len_payload) ? split_pos-reasm_offset : 0;
if (rsplit_pos)
{
if (split_pos==rsplit_pos)
DLOG("split pos %zu\n",split_pos)
else
{
if (split_pos)
DLOG("split pos was normalized to packet data offset : %zu -> %zu\n",rsplit_pos,split_pos)
else
DLOG("split pos %zu is outside of this packet %zu-%zu\n",rsplit_pos,reasm_offset,reasm_offset+len_payload)
}
}
return split_pos;
}
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)
{
uint8_t verdict=VERDICT_PASS;
@ -634,6 +654,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
uint8_t *p, *phost;
const uint8_t *rdata_payload = data_payload;
size_t rlen_payload = len_payload;
size_t split_pos;
if (replay)
{
@ -679,6 +700,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
DLOG("req retrans : tcp seq interval %u-%u\n",ctrack->req_seq_start,ctrack->req_seq_end);
}
}
split_pos = HttpPos(params.desync_split_http_req, params.desync_split_pos, rdata_payload, rlen_payload);
bKnownProtocol = true;
}
else if (IsTLSClientHello(rdata_payload,rlen_payload,TLS_PARTIALS_ENABLE))
@ -722,9 +744,9 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
if (!ReasmIsEmpty(&ctrack->reasm_orig))
{
verdict_tcp_csum_fix(verdict, tcphdr, transport_len, ip, ip6hdr);
if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, data_pkt, *len_pkt))
if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, data_pkt, *len_pkt, len_payload))
{
DLOG("DELAY desync until reasm is complete (%u)\n", rawpacket_queue_count(&ctrack->delayed));
DLOG("DELAY desync until reasm is complete (#%u)\n", rawpacket_queue_count(&ctrack->delayed));
}
else
{
@ -750,8 +772,11 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
fake = params.fake_tls;
fake_size = params.fake_tls_size;
split_pos = TLSPos(params.desync_split_tls, params.desync_split_pos, rdata_payload, rlen_payload, 0);
bKnownProtocol = true;
}
else
split_pos=params.desync_split_pos;
reasm_orig_cancel(ctrack);
rdata_payload=NULL;
@ -843,6 +868,9 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
printf("\n");
}
if (!split_pos || split_pos>rlen_payload) split_pos=1;
split_pos=pos_normalize(split_pos,reasm_offset,len_payload);
enum dpi_desync_mode desync_mode = params.desync_mode;
uint32_t fooling_orig = FOOL_NONE;
bool b;
@ -852,6 +880,11 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
switch(desync_mode)
{
case DESYNC_FAKE_KNOWN:
if (reasm_offset)
{
desync_mode = params.desync_mode2;
break;
}
if (!bKnownProtocol)
{
DLOG("not applying fake because of unknown protocol\n");
@ -859,6 +892,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
break;
}
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,params.desync_fooling_mode,params.desync_badseq_increment,params.desync_badseq_ack_increment,
fake, fake_size, pkt1, &pkt1_len))
@ -871,6 +905,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
break;
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,params.desync_fooling_mode,params.desync_badseq_increment,params.desync_badseq_ack_increment,
NULL, 0, pkt1, &pkt1_len))
@ -884,7 +919,9 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
case DESYNC_DESTOPT:
case DESYNC_IPFRAG1:
fooling_orig = (desync_mode==DESYNC_HOPBYHOP) ? FOOL_HOPBYHOP : (desync_mode==DESYNC_DESTOPT) ? FOOL_DESTOPT : FOOL_IPFRAG1;
if (ip6hdr && (params.desync_mode2==DESYNC_NONE || !desync_valid_second_stage_tcp(params.desync_mode2)))
desync_mode = params.desync_mode2;
if (ip6hdr && (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,fooling_orig,0,0,
@ -898,7 +935,6 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
// this mode is final, no other options available
return VERDICT_DROP;
}
desync_mode = params.desync_mode2;
}
if (b)
@ -916,12 +952,12 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
desync_mode = params.desync_mode2;
}
size_t split_pos=len_payload>params.desync_split_pos ? params.desync_split_pos : 1;
pkt1_len = sizeof(pkt1);
switch(desync_mode)
{
case DESYNC_DISORDER:
case DESYNC_DISORDER2:
if (split_pos)
{
uint8_t fakeseg[DPI_DESYNC_MAX_FAKE_LEN+100];
size_t fakeseg_len;
@ -976,6 +1012,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
break;
case DESYNC_SPLIT:
case DESYNC_SPLIT2:
if (split_pos)
{
uint8_t fakeseg[DPI_DESYNC_MAX_FAKE_LEN+100];
size_t fakeseg_len;
@ -1028,6 +1065,7 @@ static uint8_t dpi_desync_tcp_packet_play(bool replay, uint32_t fwmark, const ch
}
break;
case DESYNC_IPFRAG2:
if (!reasm_offset)
{
verdict_tcp_csum_fix(verdict, tcphdr, transport_len, ip, ip6hdr);
@ -1091,10 +1129,13 @@ static bool quic_reasm_cancel(t_ctrack *ctrack, const char *reason)
}
}
static uint8_t dpi_desync_udp_packet_play(bool replay, 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, 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)
{
uint8_t verdict=VERDICT_PASS;
// no need to desync middle packets in reasm session
if (reasm_offset) return verdict;
t_ctrack *ctrack=NULL, *ctrack_replay=NULL;
bool bReverse=false;
@ -1207,9 +1248,9 @@ static uint8_t dpi_desync_udp_packet_play(bool replay, uint32_t fwmark, const ch
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))
if (rawpacket_queue(&ctrack->delayed, &dst, desync_fwmark, ifout, data_pkt, *len_pkt, len_payload))
{
DLOG("DELAY desync until reasm is complete (%u)\n", rawpacket_queue_count(&ctrack->delayed));
DLOG("DELAY desync until reasm is complete (#%u)\n", rawpacket_queue_count(&ctrack->delayed));
}
else
{
@ -1512,7 +1553,7 @@ static void packet_debug(bool replay, uint8_t proto, const struct ip *ip, const
}
static uint8_t dpi_desync_packet_play(bool replay, uint32_t fwmark, const char *ifout, uint8_t *data_pkt, size_t *len_pkt)
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;
@ -1532,14 +1573,14 @@ static uint8_t dpi_desync_packet_play(bool replay, uint32_t fwmark, const char *
case IPPROTO_TCP:
if (tcphdr)
{
verdict = dpi_desync_tcp_packet_play(replay, fwmark, ifout, data_pkt, len_pkt, ip, ip6hdr, tcphdr, transport_len, data_payload, len_payload);
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);
}
break;
case IPPROTO_UDP:
if (udphdr)
{
verdict = dpi_desync_udp_packet_play(replay, fwmark, ifout, data_pkt, len_pkt, ip, ip6hdr, udphdr, transport_len, data_payload, len_payload);
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);
}
break;
@ -1549,37 +1590,35 @@ static uint8_t dpi_desync_packet_play(bool replay, uint32_t fwmark, const char *
}
uint8_t dpi_desync_packet(uint32_t fwmark, const char *ifout, uint8_t *data_pkt, size_t *len_pkt)
{
return dpi_desync_packet_play(false, fwmark, ifout, data_pkt, len_pkt);
return dpi_desync_packet_play(false, 0, fwmark, ifout, data_pkt, len_pkt);
}
static bool replay_queue(struct rawpacket_tailhead *q)
{
struct rawpacket *rp = rawpacket_dequeue(q);
if (rp)
{
DLOG("REPLAYING first delayed packet\n")
struct rawpacket *rp;
size_t offset;
unsigned int i;
bool b = true;
uint8_t verdict = dpi_desync_packet_play(true, rp->fwmark, rp->ifout, rp->packet, &rp->len);
for (i=1,offset=0 ; (rp=rawpacket_dequeue(q)) ; offset+=rp->len_payload, rawpacket_free(rp), i++)
{
DLOG("REPLAYING delayed packet #%u offset %zu\n",i,offset)
uint8_t verdict = dpi_desync_packet_play(true, offset, rp->fwmark, rp->ifout, rp->packet, &rp->len);
switch(verdict & VERDICT_MASK)
{
case VERDICT_MODIFY:
DLOG("SENDING first delayed packet modified\n")
DLOG("SENDING delayed packet #%u modified\n", i)
b &= rawsend_rp(rp);
break;
case VERDICT_PASS:
DLOG("SENDING first delayed packet unmodified\n")
DLOG("SENDING delayed packet #%u unmodified\n", i)
b &= rawsend_rp(rp);
break;
case VERDICT_DROP:
DLOG("DROPPING first delayed packet\n")
DLOG("DROPPING delayed packet #%u\n", i)
break;
}
rawpacket_free(rp);
DLOG("SENDING %u remaining delayed packets\n", rawpacket_queue_count(q))
b &= rawsend_queue(q);
}
return b;
}
return false;
}

172
nfq/nfqws.c
View File

@ -791,6 +791,8 @@ static void exithelp(void)
" --dpi-desync-repeats=<N>\t\t\t; send every desync packet N times\n"
" --dpi-desync-skip-nosni=0|1\t\t\t; 1(default)=do not act on ClientHello without SNI (ESNI ?)\n"
" --dpi-desync-split-pos=<1..%u>\t\t; data payload split position\n"
" --dpi-desync-split-http-req=method|host\t; split at specified logical part of plain http request\n"
" --dpi-desync-split-tls=sni|sniext\t\t; split at specified logical part of TLS ClientHello\n"
" --dpi-desync-ipfrag-pos-tcp=<8..%u>\t\t; ip frag position starting from the transport header. multiple of 8, default %u.\n"
" --dpi-desync-ipfrag-pos-udp=<8..%u>\t\t; ip frag position starting from the transport header. multiple of 8, default %u.\n"
" --dpi-desync-badseq-increment=<int|0xHEX>\t; badseq fooling seq signed increment. default %d\n"
@ -828,6 +830,26 @@ static void exithelp_clean(void)
exithelp();
}
bool parse_httpreqpos(const char *s, enum httpreqpos *pos)
{
if (!strcmp(s, "method"))
*pos = httpreqpos_method;
else if (!strcmp(s, "host"))
*pos = httpreqpos_host;
else
return false;
return true;
}
bool parse_tlspos(const char *s, enum tlspos *pos)
{
if (!strcmp(s, "sni"))
*pos = tlspos_sni;
else if (!strcmp(s, "sniext"))
*pos = tlspos_sniext;
else
return false;
return true;
}
int main(int argc, char **argv)
{
@ -943,41 +965,43 @@ int main(int argc, char **argv)
{"dpi-desync-repeats",required_argument,0,0}, // optidx=21
{"dpi-desync-skip-nosni",optional_argument,0,0},// optidx=22
{"dpi-desync-split-pos",required_argument,0,0},// optidx=23
{"dpi-desync-ipfrag-pos-tcp",required_argument,0,0},// optidx=24
{"dpi-desync-ipfrag-pos-udp",required_argument,0,0},// optidx=25
{"dpi-desync-badseq-increment",required_argument,0,0},// optidx=26
{"dpi-desync-badack-increment",required_argument,0,0},// optidx=27
{"dpi-desync-any-protocol",optional_argument,0,0},// optidx=28
{"dpi-desync-fake-http",required_argument,0,0},// optidx=29
{"dpi-desync-fake-tls",required_argument,0,0},// optidx=30
{"dpi-desync-fake-unknown",required_argument,0,0},// optidx=31
{"dpi-desync-fake-syndata",required_argument,0,0},// optidx=32
{"dpi-desync-fake-quic",required_argument,0,0},// optidx=33
{"dpi-desync-fake-wireguard",required_argument,0,0},// optidx=34
{"dpi-desync-fake-dht",required_argument,0,0},// optidx=35
{"dpi-desync-fake-unknown-udp",required_argument,0,0},// optidx=36
{"dpi-desync-udplen-increment",required_argument,0,0},// optidx=37
{"dpi-desync-udplen-pattern",required_argument,0,0},// optidx=38
{"dpi-desync-cutoff",required_argument,0,0},// optidx=39
{"dpi-desync-start",required_argument,0,0},// optidx=40
{"hostlist",required_argument,0,0}, // optidx=41
{"hostlist-exclude",required_argument,0,0}, // optidx=42
{"hostlist-auto",required_argument,0,0}, // optidx=43
{"hostlist-auto-fail-threshold",required_argument,0,0}, // optidx=44
{"hostlist-auto-fail-time",required_argument,0,0}, // optidx=45
{"hostlist-auto-retrans-threshold",required_argument,0,0}, // optidx=46
{"hostlist-auto-debug",required_argument,0,0}, // optidx=47
{"dpi-desync-split-http-req",required_argument,0,0 },// optidx=24
{"dpi-desync-split-tls",required_argument,0,0 },// optidx=25
{"dpi-desync-ipfrag-pos-tcp",required_argument,0,0},// optidx=26
{"dpi-desync-ipfrag-pos-udp",required_argument,0,0},// optidx=27
{"dpi-desync-badseq-increment",required_argument,0,0},// optidx=28
{"dpi-desync-badack-increment",required_argument,0,0},// optidx=29
{"dpi-desync-any-protocol",optional_argument,0,0},// optidx=30
{"dpi-desync-fake-http",required_argument,0,0},// optidx=31
{"dpi-desync-fake-tls",required_argument,0,0},// optidx=32
{"dpi-desync-fake-unknown",required_argument,0,0},// optidx=33
{"dpi-desync-fake-syndata",required_argument,0,0},// optidx=34
{"dpi-desync-fake-quic",required_argument,0,0},// optidx=35
{"dpi-desync-fake-wireguard",required_argument,0,0},// optidx=36
{"dpi-desync-fake-dht",required_argument,0,0},// optidx=37
{"dpi-desync-fake-unknown-udp",required_argument,0,0},// optidx=38
{"dpi-desync-udplen-increment",required_argument,0,0},// optidx=39
{"dpi-desync-udplen-pattern",required_argument,0,0},// optidx=40
{"dpi-desync-cutoff",required_argument,0,0},// optidx=41
{"dpi-desync-start",required_argument,0,0},// optidx=42
{"hostlist",required_argument,0,0}, // optidx=43
{"hostlist-exclude",required_argument,0,0}, // optidx=44
{"hostlist-auto",required_argument,0,0}, // optidx=45
{"hostlist-auto-fail-threshold",required_argument,0,0}, // optidx=46
{"hostlist-auto-fail-time",required_argument,0,0}, // optidx=47
{"hostlist-auto-retrans-threshold",required_argument,0,0}, // optidx=48
{"hostlist-auto-debug",required_argument,0,0}, // optidx=49
#ifdef __linux__
{"bind-fix4",no_argument,0,0}, // optidx=48
{"bind-fix6",no_argument,0,0}, // optidx=49
{"bind-fix4",no_argument,0,0}, // optidx=50
{"bind-fix6",no_argument,0,0}, // optidx=51
#elif defined(__CYGWIN__)
{"wf-iface",required_argument,0,0}, // optidx=48
{"wf-l3",required_argument,0,0}, // optidx=49
{"wf-tcp",required_argument,0,0}, // optidx=50
{"wf-udp",required_argument,0,0}, // optidx=51
{"wf-raw",required_argument,0,0}, // optidx=52
{"wf-save",required_argument,0,0}, // optidx=53
{"wf-iface",required_argument,0,0}, // optidx=50
{"wf-l3",required_argument,0,0}, // optidx=51
{"wf-tcp",required_argument,0,0}, // optidx=52
{"wf-udp",required_argument,0,0}, // optidx=53
{"wf-raw",required_argument,0,0}, // optidx=54
{"wf-save",required_argument,0,0}, // optidx=55
#endif
{NULL,0,NULL,0}
};
@ -1210,13 +1234,27 @@ int main(int argc, char **argv)
params.desync_skip_nosni = !optarg || atoi(optarg);
break;
case 23: /* dpi-desync-split-pos */
if (sscanf(optarg,"%u",&params.desync_split_pos)<1 || params.desync_split_pos<1 || params.desync_split_pos>DPI_DESYNC_MAX_FAKE_LEN)
if (sscanf(optarg,"%u",&params.desync_split_pos)<1 || params.desync_split_pos<1)
{
fprintf(stderr, "dpi-desync-split-pos must be within 1..%u range\n",DPI_DESYNC_MAX_FAKE_LEN);
fprintf(stderr, "dpi-desync-split-pos is not valid\n");
exit_clean(1);
}
break;
case 24: /* dpi-desync-ipfrag-pos-tcp */
case 24: /* dpi-desync-split-http-req */
if (!parse_httpreqpos(optarg, &params.desync_split_http_req))
{
fprintf(stderr, "Invalid argument for dpi-desync-split-http-req\n");
exit_clean(1);
}
break;
case 25: /* dpi-desync-split-tls */
if (!parse_tlspos(optarg, &params.desync_split_tls))
{
fprintf(stderr, "Invalid argument for dpi-desync-split-tls\n");
exit_clean(1);
}
break;
case 26: /* dpi-desync-ipfrag-pos-tcp */
if (sscanf(optarg,"%u",&params.desync_ipfrag_pos_tcp)<1 || params.desync_ipfrag_pos_tcp<1 || params.desync_ipfrag_pos_tcp>DPI_DESYNC_MAX_FAKE_LEN)
{
fprintf(stderr, "dpi-desync-ipfrag-pos-tcp must be within 1..%u range\n",DPI_DESYNC_MAX_FAKE_LEN);
@ -1228,7 +1266,7 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 25: /* dpi-desync-ipfrag-pos-udp */
case 27: /* dpi-desync-ipfrag-pos-udp */
if (sscanf(optarg,"%u",&params.desync_ipfrag_pos_udp)<1 || params.desync_ipfrag_pos_udp<1 || params.desync_ipfrag_pos_udp>DPI_DESYNC_MAX_FAKE_LEN)
{
fprintf(stderr, "dpi-desync-ipfrag-pos-udp must be within 1..%u range\n",DPI_DESYNC_MAX_FAKE_LEN);
@ -1240,63 +1278,63 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 26: /* dpi-desync-badseq-increments */
case 28: /* dpi-desync-badseq-increments */
if (!parse_badseq_increment(optarg,&params.desync_badseq_increment))
{
fprintf(stderr, "dpi-desync-badseq-increment should be signed decimal or signed 0xHEX\n");
exit_clean(1);
}
break;
case 27: /* dpi-desync-badack-increment */
case 29: /* dpi-desync-badack-increment */
if (!parse_badseq_increment(optarg,&params.desync_badseq_ack_increment))
{
fprintf(stderr, "dpi-desync-badack-increment should be signed decimal or signed 0xHEX\n");
exit_clean(1);
}
break;
case 28: /* dpi-desync-any-protocol */
case 30: /* dpi-desync-any-protocol */
params.desync_any_proto = !optarg || atoi(optarg);
break;
case 29: /* dpi-desync-fake-http */
case 31: /* dpi-desync-fake-http */
params.fake_http_size = sizeof(params.fake_http);
load_file_or_exit(optarg,params.fake_http,&params.fake_http_size);
break;
case 30: /* dpi-desync-fake-tls */
case 32: /* dpi-desync-fake-tls */
params.fake_tls_size = sizeof(params.fake_tls);
load_file_or_exit(optarg,params.fake_tls,&params.fake_tls_size);
break;
case 31: /* dpi-desync-fake-unknown */
case 33: /* dpi-desync-fake-unknown */
params.fake_unknown_size = sizeof(params.fake_unknown);
load_file_or_exit(optarg,params.fake_unknown,&params.fake_unknown_size);
break;
case 32: /* dpi-desync-fake-syndata */
case 34: /* dpi-desync-fake-syndata */
params.fake_syndata_size = sizeof(params.fake_syndata);
load_file_or_exit(optarg,params.fake_syndata,&params.fake_syndata_size);
break;
case 33: /* dpi-desync-fake-quic */
case 35: /* dpi-desync-fake-quic */
params.fake_quic_size = sizeof(params.fake_quic);
load_file_or_exit(optarg,params.fake_quic,&params.fake_quic_size);
break;
case 34: /* dpi-desync-fake-wireguard */
case 36: /* dpi-desync-fake-wireguard */
params.fake_wg_size = sizeof(params.fake_wg);
load_file_or_exit(optarg,params.fake_wg,&params.fake_wg_size);
break;
case 35: /* dpi-desync-fake-dht */
case 37: /* dpi-desync-fake-dht */
params.fake_dht_size = sizeof(params.fake_dht);
load_file_or_exit(optarg,params.fake_dht,&params.fake_dht_size);
break;
case 36: /* dpi-desync-fake-unknown-udp */
case 38: /* dpi-desync-fake-unknown-udp */
params.fake_unknown_udp_size = sizeof(params.fake_unknown_udp);
load_file_or_exit(optarg,params.fake_unknown_udp,&params.fake_unknown_udp_size);
break;
case 37: /* dpi-desync-udplen-increment */
case 39: /* dpi-desync-udplen-increment */
if (sscanf(optarg,"%d",&params.udplen_increment)<1 || params.udplen_increment>0x7FFF || params.udplen_increment<-0x8000)
{
fprintf(stderr, "dpi-desync-udplen-increment must be integer within -32768..32767 range\n");
exit_clean(1);
}
break;
case 38: /* dpi-desync-udplen-pattern */
case 40: /* dpi-desync-udplen-pattern */
{
char buf[sizeof(params.udplen_pattern)];
size_t sz=sizeof(buf);
@ -1304,35 +1342,35 @@ int main(int argc, char **argv)
fill_pattern(params.udplen_pattern,sizeof(params.udplen_pattern),buf,sz);
}
break;
case 39: /* desync-cutoff */
case 41: /* desync-cutoff */
if (!parse_cutoff(optarg, &params.desync_cutoff, &params.desync_cutoff_mode))
{
fprintf(stderr, "invalid desync-cutoff value\n");
exit_clean(1);
}
break;
case 40: /* desync-start */
case 42: /* desync-start */
if (!parse_cutoff(optarg, &params.desync_start, &params.desync_start_mode))
{
fprintf(stderr, "invalid desync-start value\n");
exit_clean(1);
}
break;
case 41: /* hostlist */
case 43: /* hostlist */
if (!strlist_add(&params.hostlist_files, optarg))
{
fprintf(stderr, "strlist_add failed\n");
exit_clean(1);
}
break;
case 42: /* hostlist-exclude */
case 44: /* hostlist-exclude */
if (!strlist_add(&params.hostlist_exclude_files, optarg))
{
fprintf(stderr, "strlist_add failed\n");
exit_clean(1);
}
break;
case 43: /* hostlist-auto */
case 45: /* hostlist-auto */
if (*params.hostlist_auto_filename)
{
fprintf(stderr, "only one auto hostlist is supported\n");
@ -1365,7 +1403,7 @@ int main(int argc, char **argv)
strncpy(params.hostlist_auto_filename, optarg, sizeof(params.hostlist_auto_filename));
params.hostlist_auto_filename[sizeof(params.hostlist_auto_filename) - 1] = '\0';
break;
case 44: /* hostlist-auto-fail-threshold */
case 46: /* hostlist-auto-fail-threshold */
params.hostlist_auto_fail_threshold = (uint8_t)atoi(optarg);
if (params.hostlist_auto_fail_threshold<1 || params.hostlist_auto_fail_threshold>20)
{
@ -1373,7 +1411,7 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 45: /* hostlist-auto-fail-time */
case 47: /* hostlist-auto-fail-time */
params.hostlist_auto_fail_time = (uint8_t)atoi(optarg);
if (params.hostlist_auto_fail_time<1)
{
@ -1381,7 +1419,7 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 46: /* hostlist-auto-retrans-threshold */
case 48: /* hostlist-auto-retrans-threshold */
params.hostlist_auto_retrans_threshold = (uint8_t)atoi(optarg);
if (params.hostlist_auto_retrans_threshold<2 || params.hostlist_auto_retrans_threshold>10)
{
@ -1389,7 +1427,7 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 47: /* hostlist-auto-debug */
case 49: /* hostlist-auto-debug */
{
FILE *F = fopen(optarg,"a+t");
if (!F)
@ -1407,28 +1445,28 @@ int main(int argc, char **argv)
}
break;
#ifdef __linux__
case 48: /* bind-fix4 */
case 50: /* bind-fix4 */
params.bind_fix4 = true;
break;
case 49: /* bind-fix6 */
case 51: /* bind-fix6 */
params.bind_fix6 = true;
break;
#elif defined(__CYGWIN__)
case 48: /* wf-iface */
case 50: /* wf-iface */
if (!sscanf(optarg,"%u.%u",&IfIdx,&SubIfIdx))
{
fprintf(stderr, "bad value for --wf-iface\n");
exit_clean(1);
}
break;
case 49: /* wf-l3 */
case 51: /* wf-l3 */
if (!wf_make_l3(optarg,&wf_ipv4,&wf_ipv6))
{
fprintf(stderr, "bad value for --wf-l3\n");
exit_clean(1);
}
break;
case 50: /* wf-tcp */
case 52: /* wf-tcp */
if (!wf_make_pf(optarg,"tcp","SrcPort",wf_pf_tcp_src,sizeof(wf_pf_tcp_src)) ||
!wf_make_pf(optarg,"tcp","DstPort",wf_pf_tcp_dst,sizeof(wf_pf_tcp_dst)))
{
@ -1436,7 +1474,7 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 51: /* wf-udp */
case 53: /* wf-udp */
if (!wf_make_pf(optarg,"udp","SrcPort",wf_pf_udp_src,sizeof(wf_pf_udp_src)) ||
!wf_make_pf(optarg,"udp","DstPort",wf_pf_udp_dst,sizeof(wf_pf_udp_dst)))
{
@ -1444,7 +1482,7 @@ int main(int argc, char **argv)
exit_clean(1);
}
break;
case 52: /* wf-raw */
case 54: /* wf-raw */
if (optarg[0]=='@')
{
size_t sz = sizeof(windivert_filter)-1;
@ -1457,7 +1495,7 @@ int main(int argc, char **argv)
windivert_filter[sizeof(windivert_filter) - 1] = '\0';
}
break;
case 53: /* wf-save */
case 55: /* wf-save */
strncpy(wf_save_file, optarg, sizeof(wf_save_file));
wf_save_file[sizeof(wf_save_file) - 1] = '\0';
break;
@ -1514,6 +1552,8 @@ int main(int argc, char **argv)
DLOG("autottl ipv4 %u:%u-%u\n",params.desync_autottl.delta,params.desync_autottl.min,params.desync_autottl.max)
if (AUTOTTL_ENABLED(params.desync_autottl6))
DLOG("autottl ipv6 %u:%u-%u\n",params.desync_autottl6.delta,params.desync_autottl6.min,params.desync_autottl6.max)
if (params.desync_split_tls==tlspos_none && params.desync_split_pos) params.desync_split_tls=tlspos_pos;
if (params.desync_split_http_req==httpreqpos_none && params.desync_split_pos) params.desync_split_http_req=httpreqpos_pos;
if (!LoadIncludeHostLists())
{

3
nfq/packet_queue.c
View File

@ -25,7 +25,7 @@ void rawpacket_queue_destroy(struct rawpacket_tailhead *q)
while((rp = rawpacket_dequeue(q))) rawpacket_free(rp);
}
struct rawpacket *rawpacket_queue(struct rawpacket_tailhead *q,const struct sockaddr_storage* dst,uint32_t fwmark,const char *ifout,const void *data,size_t len)
struct rawpacket *rawpacket_queue(struct rawpacket_tailhead *q,const struct sockaddr_storage* dst,uint32_t fwmark,const char *ifout,const void *data,size_t len,size_t len_payload)
{
struct rawpacket *rp = malloc(sizeof(struct rawpacket));
if (!rp) return NULL;
@ -48,6 +48,7 @@ struct rawpacket *rawpacket_queue(struct rawpacket_tailhead *q,const struct sock
rp->ifout[0]=0;
memcpy(rp->packet,data,len);
rp->len=len;
rp->len_payload=len_payload;
TAILQ_INSERT_TAIL(q, rp, next);

4
nfq/packet_queue.h
View File

@ -11,7 +11,7 @@ struct rawpacket
struct sockaddr_storage dst;
char ifout[IFNAMSIZ+1];
uint32_t fwmark;
size_t len;
size_t len, len_payload;
uint8_t *packet;
TAILQ_ENTRY(rawpacket) next;
};
@ -21,6 +21,6 @@ void rawpacket_queue_init(struct rawpacket_tailhead *q);
void rawpacket_queue_destroy(struct rawpacket_tailhead *q);
bool rawpacket_queue_empty(const struct rawpacket_tailhead *q);
unsigned int rawpacket_queue_count(const struct rawpacket_tailhead *q);
struct rawpacket *rawpacket_queue(struct rawpacket_tailhead *q,const struct sockaddr_storage* dst,uint32_t fwmark,const char *ifout,const void *data,size_t len);
struct rawpacket *rawpacket_queue(struct rawpacket_tailhead *q,const struct sockaddr_storage* dst,uint32_t fwmark,const char *ifout,const void *data,size_t len,size_t len_payload);
struct rawpacket *rawpacket_dequeue(struct rawpacket_tailhead *q);
void rawpacket_free(struct rawpacket *rp);

3
nfq/params.h
View File

@ -3,6 +3,7 @@
#include "pools.h"
#include "conntrack.h"
#include "desync.h"
#include "protocol.h"
#include <sys/param.h>
#include <sys/types.h>
@ -50,6 +51,8 @@ struct params_s
enum dpi_desync_mode desync_mode0,desync_mode,desync_mode2;
bool desync_retrans,desync_skip_nosni,desync_any_proto;
unsigned int desync_repeats,desync_split_pos,desync_ipfrag_pos_tcp,desync_ipfrag_pos_udp;
enum httpreqpos desync_split_http_req;
enum tlspos desync_split_tls;
char desync_start_mode, desync_cutoff_mode; // n - packets, d - data packets, s - relative sequence
unsigned int desync_start, desync_cutoff;
uint8_t desync_ttl, desync_ttl6;

78
nfq/protocol.c
View File

@ -8,7 +8,7 @@
#include <string.h>
const char *http_methods[] = { "GET /","POST /","HEAD /","OPTIONS /","PUT /","DELETE /","CONNECT /","TRACE /",NULL };
bool IsHttp(const uint8_t *data, size_t len)
const char *HttpMethod(const uint8_t *data, size_t len)
{
const char **method;
size_t method_len;
@ -16,10 +16,34 @@ bool IsHttp(const uint8_t *data, size_t len)
{
method_len = strlen(*method);
if (method_len <= len && !memcmp(data, *method, method_len))
return true;
return *method;
}
return false;
return NULL;
}
bool IsHttp(const uint8_t *data, size_t len)
{
return !!HttpMethod(data,len);
}
// pHost points to "Host: ..."
bool HttpFindHost(uint8_t **pHost,uint8_t *buf,size_t bs)
{
if (!*pHost)
{
*pHost = memmem(buf, bs, "\nHost:", 6);
if (*pHost) (*pHost)++;
}
return !!*pHost;
}
bool HttpFindHostConst(const uint8_t **pHost,const uint8_t *buf,size_t bs)
{
if (!*pHost)
{
*pHost = memmem(buf, bs, "\nHost:", 6);
if (*pHost) (*pHost)++;
}
return !!*pHost;
}
bool IsHttpReply(const uint8_t *data, size_t len)
{
// HTTP/1.x 200\r\n
@ -106,6 +130,37 @@ bool HttpReplyLooksLikeDPIRedirect(const uint8_t *data, size_t len, const char *
return strcasecmp(dhost, drhost)!=0;
}
size_t HttpPos(enum httpreqpos tpos_type, size_t hpos_pos, const uint8_t *http, size_t sz)
{
const uint8_t *method, *host;
int i;
switch(tpos_type)
{
case httpreqpos_method:
// recognize some tpws pre-applied hacks
method=http;
if (sz<10) break;
if (*method=='\n' || *method=='\r') method++;
if (*method=='\n' || *method=='\r') method++;
for (i=0;i<7;i++) if (*method>='A' && *method<='Z') method++;
if (i<3 || *method!=' ') break;
return method-http-1;
case httpreqpos_host:
if (HttpFindHostConst(&host,http,sz) && (host-http+7)<sz)
{
host+=5;
if (*host==' ') host++;
return host-http;
}
break;
case httpreqpos_pos:
break;
default:
return 0;
}
return hpos_pos<sz ? hpos_pos : 0;
}
uint16_t TLSRecordDataLen(const uint8_t *data)
@ -250,6 +305,23 @@ bool TLSHelloExtractHostFromHandshake(const uint8_t *data, size_t len, char *hos
if (!TLSFindExtInHandshake(data, len, 0, &ext, &elen, bPartialIsOK)) return false;
return TLSExtractHostFromExt(ext, elen, host, len_host);
}
size_t TLSPos(enum tlspos tpos_type, size_t tpos_pos, const uint8_t *tls, size_t sz, uint8_t type)
{
size_t elen;
const uint8_t *ext;
switch(tpos_type)
{
case tlspos_sni:
case tlspos_sniext:
if (TLSFindExt(tls,sz,0,&ext,&elen,false))
return (tpos_type==tlspos_sni) ? ext-tls+6 : ext-tls+1;
// fall through
case tlspos_pos:
return tpos_pos<sz ? tpos_pos : 0;
default:
return 0;
}
}

8
nfq/protocol.h
View File

@ -7,7 +7,11 @@
#include "crypto/aes-gcm.h"
#include "helpers.h"
extern const char *http_methods[9];
const char *HttpMethod(const uint8_t *data, size_t len);
bool IsHttp(const uint8_t *data, size_t len);
bool HttpFindHost(uint8_t **pHost,uint8_t *buf,size_t bs);
bool HttpFindHostConst(const uint8_t **pHost,const uint8_t *buf,size_t bs);
// header must be passed like this : "\nHost:"
bool HttpExtractHeader(const uint8_t *data, size_t len, const char *header, char *buf, size_t len_buf);
bool HttpExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host);
@ -17,6 +21,8 @@ const char *HttpFind2ndLevelDomain(const char *host);
int HttpReplyCode(const uint8_t *data, size_t len);
// must be pre-checked by IsHttpReply
bool HttpReplyLooksLikeDPIRedirect(const uint8_t *data, size_t len, const char *host);
enum httpreqpos { httpreqpos_none = 0, httpreqpos_method, httpreqpos_host, httpreqpos_pos };
size_t HttpPos(enum httpreqpos tpos_type, size_t hpos_pos, const uint8_t *http, size_t sz);
uint16_t TLSRecordDataLen(const uint8_t *data);
size_t TLSRecordLen(const uint8_t *data);
@ -29,6 +35,8 @@ bool TLSFindExt(const uint8_t *data, size_t len, uint16_t type, const uint8_t **
bool TLSFindExtInHandshake(const uint8_t *data, size_t len, uint16_t type, const uint8_t **ext, size_t *len_ext, bool bPartialIsOK);
bool TLSHelloExtractHost(const uint8_t *data, size_t len, char *host, size_t len_host, bool bPartialIsOK);
bool TLSHelloExtractHostFromHandshake(const uint8_t *data, size_t len, char *host, size_t len_host, bool bPartialIsOK);
enum tlspos { tlspos_none = 0, tlspos_sni, tlspos_sniext, tlspos_pos };
size_t TLSPos(enum tlspos tpos_type, size_t tpos_pos, const uint8_t *tls, size_t sz, uint8_t type);
bool IsWireguardHandshakeInitiation(const uint8_t *data, size_t len);
bool IsDhtD1(const uint8_t *data, size_t len);