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Remaster tls parser for quic crypto

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This commit is contained in:
Vadim Vetrov
2025-01-02 19:02:21 +03:00
parent fa7fe5294d
commit e5153e9186
6 changed files with 368 additions and 127 deletions
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63
src/quic.c
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@@ -18,7 +18,10 @@ uint64_t quic_parse_varlength(const uint8_t *variable, uint64_t *mlen) {
uint8_t len = 1 << (*variable >> 6);
if (mlen) {
if (*mlen < len) return 0;
if (*mlen < len) {
*mlen = 0;
return 0;
}
*mlen = len;
}
@@ -164,6 +167,47 @@ invalid_packet:
return -EINVAL;
}
ssize_t quic_parse_crypto(struct quic_frame_crypto *crypto_frame,
const uint8_t *frame, uint64_t flen) {
const uint8_t *curptr = frame;
uint64_t curptr_len = flen;
uint64_t vln;
*crypto_frame = (struct quic_frame_crypto){0};
if (flen == 0 || *frame != QUIC_FRAME_CRYPTO ||
crypto_frame == NULL)
return -EINVAL;
curptr++, curptr_len--;
vln = curptr_len;
uint64_t offset = quic_parse_varlength(curptr, &vln);
curptr += vln, curptr_len -= vln;
if (vln == 0) {
return -EINVAL;
}
vln = curptr_len;
uint64_t length = quic_parse_varlength(curptr, &vln);
curptr += vln, curptr_len -= vln;
if (vln == 0) {
return -EINVAL;
}
if (length > curptr_len)
return -EINVAL;
crypto_frame->offset = offset;
crypto_frame->payload_length = length;
crypto_frame->payload = curptr;
curptr += length;
curptr_len -= length;
return flen - curptr_len;
}
int udp_fail_packet(struct udp_failing_strategy strategy, uint8_t *payload, uint32_t *plen, uint32_t avail_buflen) {
void *iph;
uint32_t iph_len;
@@ -313,20 +357,11 @@ int detect_udp_filtered(const struct section_config_t *section,
lgtrace_addp("QUIC detected");
uint8_t qtype = qch->type;
if (qch->version == QUIC_V1)
qtype = quic_convtype_v1(qtype);
else if (qch->version == QUIC_V2)
qtype = quic_convtype_v2(qtype);
if (qtype != QUIC_INITIAL_TYPE) {
lgtrace_addp("QUIC message type: %d", qtype);
goto match_port;
if (quic_check_is_initial(qch)) {
lgtrace_addp("QUIC initial message");
goto approve;
}
lgtrace_addp("QUIC initial message");
goto approve;
}
match_port: