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Enhance middle sni split

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Instead of real middle sni we use targetted middle sni for explicit (not
all) sni domain list
This commit is contained in:
Vadim Vetrov 2024-09-28 11:31:46 +03:00
parent 82c49119d3
commit 3ee979f7d1
No known key found for this signature in database
GPG Key ID: E8A308689D7A73A5
3 changed files with 8 additions and 4 deletions
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7
mangle.c
View File

@ -190,7 +190,7 @@ int process_tcp_packet(const uint8_t *raw_payload, uint32_t raw_payload_len) {
switch (config.fragmentation_strategy) { switch (config.fragmentation_strategy) {
case FRAG_STRAT_TCP: { case FRAG_STRAT_TCP: {
ipd_offset = vrd.sni_offset; ipd_offset = vrd.sni_target_offset;
mid_offset = ipd_offset + vrd.sni_len / 2; mid_offset = ipd_offset + vrd.sni_len / 2;
uint32_t poses[2]; uint32_t poses[2];
@ -221,7 +221,7 @@ int process_tcp_packet(const uint8_t *raw_payload, uint32_t raw_payload_len) {
break; break;
case FRAG_STRAT_IP: case FRAG_STRAT_IP:
if (ipxv == IP4VERSION) { if (ipxv == IP4VERSION) {
ipd_offset = ((char *)data - (char *)tcph) + vrd.sni_offset; ipd_offset = ((char *)data - (char *)tcph) + vrd.sni_target_offset;
mid_offset = ipd_offset + vrd.sni_len / 2; mid_offset = ipd_offset + vrd.sni_len / 2;
mid_offset += 8 - mid_offset % 8; mid_offset += 8 - mid_offset % 8;
@ -618,7 +618,8 @@ int post_fake_sni(const void *iph, unsigned int iph_len,
fake_seq_type.type = FAKE_PAYLOAD_DEFAULT; fake_seq_type.type = FAKE_PAYLOAD_DEFAULT;
} }
for (int i = 0; i < sequence_len; i++) { // one goes for default fake
for (int i = 1; i < sequence_len; i++) {
NETBUF_ALLOC(fake_sni, MAX_PACKET_SIZE); NETBUF_ALLOC(fake_sni, MAX_PACKET_SIZE);
if (!NETBUF_CHECK(fake_sni)) { if (!NETBUF_CHECK(fake_sni)) {
lgerror("Allocation error", -ENOMEM); lgerror("Allocation error", -ENOMEM);

4
tls.c
View File

@ -122,6 +122,7 @@ struct tls_verdict analyze_tls_data(
char *sni_name = (char *)sni_ext_ptr; char *sni_name = (char *)sni_ext_ptr;
vrd.sni_offset = (uint8_t *)sni_name - data; vrd.sni_offset = (uint8_t *)sni_name - data;
vrd.sni_target_offset = vrd.sni_offset;
vrd.sni_len = sni_len; vrd.sni_len = sni_len;
if (config.all_domains) { if (config.all_domains) {
@ -129,7 +130,6 @@ struct tls_verdict analyze_tls_data(
goto check_domain; goto check_domain;
} }
unsigned int j = 0; unsigned int j = 0;
for (unsigned int i = 0; i <= config.domains_strlen; i++) { for (unsigned int i = 0; i <= config.domains_strlen; i++) {
if ( i > j && if ( i > j &&
@ -148,6 +148,7 @@ struct tls_verdict analyze_tls_data(
domain_startp, domain_startp,
domain_len)) { domain_len)) {
vrd.target_sni = 1; vrd.target_sni = 1;
vrd.sni_target_offset = (const uint8_t *)sni_startp - data;
goto check_domain; goto check_domain;
} }
@ -247,6 +248,7 @@ brute:
vrd.target_sni = 1; vrd.target_sni = 1;
vrd.sni_len = domain_len; vrd.sni_len = domain_len;
vrd.sni_offset = (k - domain_len - 1); vrd.sni_offset = (k - domain_len - 1);
vrd.sni_target_offset = vrd.sni_offset
NETBUF_FREE(buf); NETBUF_FREE(buf);
NETBUF_FREE(nzbuf); NETBUF_FREE(nzbuf);
goto out; goto out;

1
tls.h
View File

@ -10,6 +10,7 @@
struct tls_verdict { struct tls_verdict {
int target_sni; /* google video hello packet */ int target_sni; /* google video hello packet */
int sni_offset; /* offset from start of tcp _payload_ */ int sni_offset; /* offset from start of tcp _payload_ */
int sni_target_offset; /* offset of target domain instead of entire sni */
int sni_len; int sni_len;
}; };