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Add Timestamp faking strategy

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This commit is contained in:
Vadim Vetrov
2026-01-31 14:54:51 +03:00
parent da650bd09f
commit c9b59f9ce7
8 changed files with 295 additions and 114 deletions
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141
src/mangle.c
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@@ -315,7 +315,6 @@ int process_tcp_packet(const struct section_config_t *section, const uint8_t *ra
set_tcp_checksum(tcph, iph, iph_len);
}
/*
if (0) {
int delta = 2;
ret = seqovl_packet(payload, &payload_len, delta);
@@ -326,14 +325,28 @@ int process_tcp_packet(const struct section_config_t *section, const uint8_t *ra
lgerror(ret, "seqovl_packet delta %d", delta);
}
}
*/
if (dlen > AVAILABLE_MTU) {
lgdebug("WARNING! Client Hello packet is too big and may cause issues!");
}
if (section->fake_sni) {
post_fake_sni(args_default_fake_type(section), iph, iph_len, tcph, tcph_len);
struct fake_type f_type = args_default_fake_type(section);
// f_type.strategy.strategy = FAKE_STRAT_RAND_SEQ;
// f_type.strategy.randseq_offset = f_type.fake_len - 1;
// f_type.fake_data = "\x16";
// f_type.fake_len = 1;
//
// post_fake_sni(f_type, iph, iph_len, tcph, tcph_len);
//
// f_type = args_default_fake_type(section);
// // f_type.strategy.strategy = FAKE_STRAT_RAND_SEQ;
// // f_type.strategy.randseq_offset = 0;
// f_type.fake_data += 1;
// f_type.fake_len -= 1;
post_fake_sni(f_type, iph, iph_len, tcph, tcph_len);
}
size_t ipd_offset;
@@ -653,6 +666,7 @@ send_fake:
struct tcphdr *tcph;
ret = tcp_payload_split(frag2, f2len, &iph, &iphfl, &tcph, &tcphfl, NULL, NULL);
struct fake_type f_type = args_default_fake_type(section);
if ((f_type.strategy.strategy & FAKE_STRAT_PAST_SEQ) == FAKE_STRAT_PAST_SEQ) {
f_type.strategy.strategy ^= FAKE_STRAT_PAST_SEQ;
f_type.strategy.strategy |= FAKE_STRAT_RAND_SEQ;
@@ -704,71 +718,68 @@ int post_fake_sni(struct fake_type f_type,
void *fsiph = (void *)rfsiph;
struct tcphdr *fstcph = (void *)rfstcph;
ITER_FAKE_STRAT(f_type.strategy.strategy, strategy) {
struct fake_type fake_seq_type = f_type;
fake_seq_type.strategy.strategy = strategy;
struct fake_type fake_seq_type = f_type;
// one goes for default fake
for (int i = 0; i < fake_seq_type.sequence_len; i++) {
uint8_t *fake_sni;
size_t fake_sni_len;
ret = gen_fake_sni(
fake_seq_type,
fsiph, iph_len, fstcph, tcph_len,
&fake_sni, &fake_sni_len);
if (ret < 0) {
lgerror(ret, "gen_fake_sni");
return ret;
}
lgtrace_addp("post fake sni #%d", i + 1);
if (f_type.seg2delay) {
ret = instance_config.send_delayed_packet(fake_sni, fake_sni_len, f_type.seg2delay);
} else {
ret = instance_config.send_raw_packet(fake_sni, fake_sni_len);
}
if (ret < 0) {
lgerror(ret, "send fake sni");
goto erret_lc;
}
size_t iph_len;
size_t tcph_len;
size_t plen;
ret = tcp_payload_split(
fake_sni, fake_sni_len,
&fsiph, &iph_len,
&fstcph, &tcph_len,
NULL, &plen);
if (ret < 0) {
lgtrace_addp("continue fake seq");
goto erret_lc;
}
if (!(strategy == FAKE_STRAT_PAST_SEQ ||
strategy == FAKE_STRAT_RAND_SEQ)) {
fstcph->seq = htonl(ntohl(fstcph->seq) + plen);
}
if (ipxv == IP4VERSION) {
((struct iphdr *)fsiph)->id = htons(ntohs(((struct iphdr *)fsiph)->id) + 1);
}
memcpy(rfsiph, fsiph, iph_len);
memcpy(rfstcph, fstcph, tcph_len);
fsiph = (void *)rfsiph;
fstcph = (void *)rfstcph;
free(fake_sni);
continue;
erret_lc:
free(fake_sni);
// one goes for default fake
for (int i = 0; i < fake_seq_type.sequence_len; i++) {
uint8_t *fake_sni;
size_t fake_sni_len;
ret = gen_fake_sni(
fake_seq_type,
fsiph, iph_len, fstcph, tcph_len,
&fake_sni, &fake_sni_len);
if (ret < 0) {
lgerror(ret, "gen_fake_sni");
return ret;
}
lgtrace_addp("post fake sni #%d", i + 1);
if (f_type.seg2delay) {
ret = instance_config.send_delayed_packet(fake_sni, fake_sni_len, f_type.seg2delay);
} else {
ret = instance_config.send_raw_packet(fake_sni, fake_sni_len);
}
if (ret < 0) {
lgerror(ret, "send fake sni");
goto erret_lc;
}
size_t iph_len;
size_t tcph_len;
size_t plen;
ret = tcp_payload_split(
fake_sni, fake_sni_len,
&fsiph, &iph_len,
&fstcph, &tcph_len,
NULL, &plen);
if (ret < 0) {
lgtrace_addp("continue fake seq");
goto erret_lc;
}
if (!(CHECK_BITFIELD(f_type.strategy.strategy, FAKE_STRAT_PAST_SEQ) ||
CHECK_BITFIELD(f_type.strategy.strategy, FAKE_STRAT_RAND_SEQ))) {
fstcph->seq = htonl(ntohl(fstcph->seq) + plen);
}
if (ipxv == IP4VERSION) {
((struct iphdr *)fsiph)->id = htons(ntohs(((struct iphdr *)fsiph)->id) + 1);
}
memcpy(rfsiph, fsiph, iph_len);
memcpy(rfstcph, fstcph, tcph_len);
fsiph = (void *)rfsiph;
fstcph = (void *)rfstcph;
free(fake_sni);
continue;
erret_lc:
free(fake_sni);
return ret;
}
return 0;