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Parse standard TLS record headers

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This commit is contained in:
Vitaliy Filippov
2026-05-19 17:19:35 +03:00
parent 026aaf59e7
commit 40d4162249
3 changed files with 70 additions and 51 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/client/messenger.h
+5 -3
View File
@@ -60,10 +60,12 @@ struct op_aes_xts_decrypt_t;
void destroy_aes_xts_encrypt(op_aes_xts_encrypt_t *encrypt_ctx);
void destroy_aes_xts_decrypt(op_aes_xts_decrypt_t *decrypt_ctx);
// Standard TLS record header. We are only interested in the record size
struct __attribute__((__packed__)) msgr_tls_record_hdr_t
{
uint8_t encrypted;
uint32_t size;
uint8_t content_type;
uint16_t version;
uint16_t size;
};
struct osd_client_t
@@ -97,7 +99,7 @@ struct osd_client_t
size_t ssl_out_buf_size = 0, ssl_out_buf_cap = 0;
bool ssl_handshake_done = false;
msgr_tls_record_hdr_t ssl_read_record;
size_t ssl_read_record_size = 0;
size_t ssl_read_header_size = 0;
#endif
// Read state
src/client/msgr_receive.cpp
+56 -29
View File
@@ -107,37 +107,49 @@ public:
from = cl->read_op_pos;
}
bool buffer_encrypted()
void buffer_encrypted()
{
if (cl->ssl_read_record_size < sizeof(msgr_tls_record_hdr_t))
if (cl->ssl_read_header_size < sizeof(msgr_tls_record_hdr_t))
{
size_t n = bufsize-done;
if (n > sizeof(msgr_tls_record_hdr_t)-cl->ssl_read_record_size)
n = sizeof(msgr_tls_record_hdr_t)-cl->ssl_read_record_size;
memcpy(((uint8_t*)&cl->ssl_read_record) + cl->ssl_read_record_size, curbuf+done, n);
size_t h = bufsize-done;
if (bufsize-done <= sizeof(msgr_tls_record_hdr_t)-cl->ssl_read_header_size)
{
// Less than record header or just record header
memcpy(((uint8_t*)&cl->ssl_read_record) + cl->ssl_read_header_size, curbuf+done, h);
cl->ssl_read_header_size += h;
if (cl->ssl_read_header_size == sizeof(msgr_tls_record_hdr_t))
cl->ssl_read_record.size = ntohs(cl->ssl_read_record.size);
int r = BIO_write(cl->write_to_ssl, curbuf+done, h);
assert(r == h);
done += h;
return;
}
// Record header and at least some data - copy both to BIO in a one BIO_write() call
h = sizeof(msgr_tls_record_hdr_t)-cl->ssl_read_header_size;
memcpy(((uint8_t*)&cl->ssl_read_record) + cl->ssl_read_header_size, curbuf+done, h);
cl->ssl_read_header_size = sizeof(msgr_tls_record_hdr_t);
cl->ssl_read_record.size = ntohs(cl->ssl_read_record.size);
size_t n = h + cl->ssl_read_record.size;
if (n > bufsize-done)
n = bufsize-done;
int r = BIO_write(cl->write_to_ssl, curbuf+done, n);
assert(r == n);
done += n;
cl->ssl_read_record_size += n;
if (done >= bufsize)
return true;
}
if (cl->ssl_read_record.encrypted != 1)
{
fprintf(stderr, "Client %ju got record with unknown type %u\n", cl->ssl_read_record.encrypted);
cl->io_error = true;
return false;
cl->ssl_read_record.size -= (n - h);
if (!cl->ssl_read_record.size)
cl->ssl_read_header_size = 0;
return;
}
// Continued TLS data - buffer it to BIO
size_t n = cl->ssl_read_record.size;
if (n > bufsize-done)
n = bufsize-done;
// Buffer all encrypted data
// FIXME Limit the amount of buffered data
int r = BIO_write(cl->write_to_ssl, curbuf+done, n);
assert(r == n);
done += n;
cl->ssl_read_record.size -= n;
if (!cl->ssl_read_record.size)
cl->ssl_read_record_size = 0;
return true;
cl->ssl_read_header_size = 0;
}
bool read(uint8_t *dst, size_t dst_len, int flags) override
@@ -148,6 +160,8 @@ public:
from -= dst_len;
return true;
}
if (done >= bufsize)
return false;
size_t n = dst_len-from;
if (!(flags & RDR_TLS) || !cl->ssl_cli)
{
@@ -170,13 +184,19 @@ public:
memcpy(dst+from, curbuf+done, n);
done += n;
}
cl->read_op_pos += n;
from += n;
if (from < dst_len)
{
return false;
}
}
else
{
// Here, dst == NULL is not allowed
assert(dst != NULL);
if (!buffer_encrypted())
return false;
buffer_again:
buffer_encrypted();
if (!cl->ssl_handshake_done)
{
if (!msgr->ssl_do_handshake(cl))
@@ -198,12 +218,17 @@ public:
if (!ok)
{
ok = SSL_get_error(cl->ssl_cli, ok);
if (ok == SSL_ERROR_ZERO_RETURN)
if (ok == SSL_ERROR_WANT_READ)
{
if (done < bufsize)
goto buffer_again;
}
else if (ok == SSL_ERROR_ZERO_RETURN)
{
fprintf(stderr, "Client %ju TLS disconnected\n", cl->client_id);
cl->io_error = true;
}
else if (ok != 0 && ok != SSL_ERROR_WANT_READ && ok != SSL_ERROR_WANT_WRITE)
else if (ok != 0 && ok != SSL_ERROR_WANT_WRITE)
{
fprintf(stderr, "Client %ju TLS read error: %s. Disconnecting client\n", cl->client_id, ERR_error_string(ERR_get_error(), NULL));
cl->io_error = true;
@@ -214,12 +239,14 @@ public:
{
XXH3_64bits_update(cl->read_csum_state, dst+from, n);
}
}
cl->read_op_pos += n;
from += n;
if (from < dst_len)
{
return false;
cl->read_op_pos += n;
from += n;
if (from < dst_len)
{
if (done < bufsize)
goto buffer_again;
return false;
}
}
from = 0;
return true;
src/client/msgr_send.cpp
+9 -19
View File
@@ -102,21 +102,6 @@ public:
from = cl->write_op_pos;
}
static inline size_t ssl_copy_from_bio(BIO *bio, uint8_t *buf, size_t size)
{
if (size < sizeof(msgr_tls_record_hdr_t))
return 0;
int r = BIO_read(bio, buf+sizeof(msgr_tls_record_hdr_t), size-sizeof(msgr_tls_record_hdr_t));
if (r > 0)
{
msgr_tls_record_hdr_t *hdr = (msgr_tls_record_hdr_t*)buf;
hdr->encrypted = 1;
hdr->size = r;
return r+sizeof(msgr_tls_record_hdr_t);
}
return 0;
}
void flush_ssl()
{
if (!cl->ssl_handshake_done)
@@ -124,7 +109,9 @@ public:
if (!msgr->ssl_do_handshake(cl))
return;
}
done += ssl_copy_from_bio(cl->read_from_ssl, curbuf+done, bufsize-done);
int r = BIO_read(cl->read_from_ssl, curbuf+done, bufsize-done);
if (r > 0)
done += r;
}
static inline bool write_to_ssl(osd_client_t *cl, uint8_t *src, size_t src_len, int flags, size_t & from)
@@ -195,7 +182,9 @@ public:
if (!write_to_ssl(cl, src, src_len, flags, from))
return false;
}
done += ssl_copy_from_bio(cl->read_from_ssl, curbuf+done, bufsize-done);
int r = BIO_read(cl->read_from_ssl, curbuf+done, bufsize-done);
if (r > 0)
done += r;
}
if (from < src_len)
return false;
@@ -242,8 +231,9 @@ class get_op_writer_t: public msgr_op_writer_t
do
{
ssl_extend_buf();
cl->ssl_out_buf_size += ssl_op_writer_t::ssl_copy_from_bio(cl->read_from_ssl,
cl->ssl_out_buf+cl->ssl_out_buf_size, cl->ssl_out_buf_cap-cl->ssl_out_buf_size);
int r = BIO_read(cl->read_from_ssl, cl->ssl_out_buf+cl->ssl_out_buf_size, cl->ssl_out_buf_cap-cl->ssl_out_buf_size);
if (r > 0)
cl->ssl_out_buf_size += r;
} while (cl->ssl_out_buf_size >= cl->ssl_out_buf_cap);
if (cl->ssl_out_buf_size > prev_size)
{