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Add synfake option

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This commit is contained in:
Vadim Vetrov
2024-08-29 14:45:27 +03:00
parent 33b0ca421b
commit 0f71d5f3c4
4 changed files with 52 additions and 2 deletions
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31
mangle.c
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@@ -67,6 +67,8 @@ drop:
}
int process_tcp_packet(const uint8_t *raw_payload, uint32_t raw_payload_len) {
const void *ipxh;
uint32_t iph_len;
const struct tcphdr *tcph;
uint32_t tcph_len;
const uint8_t *data;
@@ -78,7 +80,7 @@ int process_tcp_packet(const uint8_t *raw_payload, uint32_t raw_payload_len) {
lgtrace_addp("IPv%d", ipxv);
int ret = tcp_payload_split((uint8_t *)raw_payload, raw_payload_len,
NULL, NULL,
(void *)&ipxh, &iph_len,
(struct tcphdr **)&tcph, &tcph_len,
(uint8_t **)&data, &dlen);
@@ -87,6 +89,33 @@ int process_tcp_packet(const uint8_t *raw_payload, uint32_t raw_payload_len) {
goto accept;
}
if (tcph->syn && config.synfake) {
lgtrace_addp("TCP syn alter");
uint8_t payload[MAX_PACKET_SIZE];
memcpy(payload, ipxh, iph_len);
memcpy(payload + iph_len, tcph, tcph_len);
memcpy(payload + iph_len + tcph_len, config.fake_sni_pkt, config.fake_sni_pkt_sz);
struct tcphdr *tcph = (struct tcphdr *)(payload + iph_len);
if (ipxv == IP4VERSION) {
struct iphdr *iph = (struct iphdr *)payload;
iph->tot_len = htons(iph_len + tcph_len + config.fake_sni_pkt_sz);
set_ip_checksum(payload, iph_len);
set_tcp_checksum(tcph, iph, iph_len);
} else if (ipxv == IP6VERSION) {
struct ip6_hdr *ip6h = (struct ip6_hdr *)payload;
ip6h->ip6_ctlun.ip6_un1.ip6_un1_plen = ntohs(tcph_len + config.fake_sni_pkt_sz);
set_ip_checksum(ip6h, iph_len);
set_tcp_checksum(tcph, ip6h, iph_len);
}
instance_config.send_raw_packet(payload, iph_len + tcph_len + config.fake_sni_pkt_sz);
goto drop;
}
struct tls_verdict vrd = analyze_tls_data(data, dlen);
if (vrd.target_sni) {