* along with this software; if not, see <http://www.gnu.org/licenses/>.
*/
+#include "qemu/osdep.h"
+#include "qapi/error.h"
#include "vnc.h"
-#include "qemu/main-loop.h"
-#include "crypto/hash.h"
+#include "io/channel-websock.h"
-#ifdef CONFIG_VNC_TLS
-#include "qemu/sockets.h"
-
-static int vncws_start_tls_handshake(VncState *vs)
+static void vncws_tls_handshake_done(Object *source,
+ Error *err,
+ gpointer user_data)
{
- int ret = gnutls_handshake(vs->tls.session);
+ VncState *vs = user_data;
- if (ret < 0) {
- if (!gnutls_error_is_fatal(ret)) {
- VNC_DEBUG("Handshake interrupted (blocking)\n");
- if (!gnutls_record_get_direction(vs->tls.session)) {
- qemu_set_fd_handler(vs->csock, vncws_tls_handshake_io,
- NULL, vs);
- } else {
- qemu_set_fd_handler(vs->csock, NULL, vncws_tls_handshake_io,
- vs);
- }
- return 0;
- }
- VNC_DEBUG("Handshake failed %s\n", gnutls_strerror(ret));
+ if (err) {
+ VNC_DEBUG("Handshake failed %s\n", error_get_pretty(err));
vnc_client_error(vs);
- return -1;
- }
-
- if (vs->vd->tls.x509verify) {
- if (vnc_tls_validate_certificate(vs) < 0) {
- VNC_DEBUG("Client verification failed\n");
- vnc_client_error(vs);
- return -1;
- } else {
- VNC_DEBUG("Client verification passed\n");
- }
+ } else {
+ VNC_DEBUG("TLS handshake complete, starting websocket handshake\n");
+ vs->ioc_tag = qio_channel_add_watch(
+ QIO_CHANNEL(vs->ioc), G_IO_IN, vncws_handshake_io, vs, NULL);
}
-
- VNC_DEBUG("Handshake done, switching to TLS data mode\n");
- qemu_set_fd_handler(vs->csock, vncws_handshake_read, NULL, vs);
-
- return 0;
}
-void vncws_tls_handshake_io(void *opaque)
-{
- VncState *vs = (VncState *)opaque;
- if (!vs->tls.session) {
- VNC_DEBUG("TLS Websocket setup\n");
- if (vnc_tls_client_setup(vs, vs->vd->tls.x509cert != NULL) < 0) {
- return;
- }
- }
- VNC_DEBUG("Handshake IO continue\n");
- vncws_start_tls_handshake(vs);
-}
-#endif /* CONFIG_VNC_TLS */
-
-void vncws_handshake_read(void *opaque)
+gboolean vncws_tls_handshake_io(QIOChannel *ioc G_GNUC_UNUSED,
+ GIOCondition condition G_GNUC_UNUSED,
+ void *opaque)
{
VncState *vs = opaque;
- uint8_t *handshake_end;
- long ret;
- /* Typical HTTP headers from novnc are 512 bytes, so limiting
- * total header size to 4096 is easily enough. */
- size_t want = 4096 - vs->ws_input.offset;
- buffer_reserve(&vs->ws_input, want);
- ret = vnc_client_read_buf(vs, buffer_end(&vs->ws_input), want);
+ QIOChannelTLS *tls;
+ Error *err = NULL;
- if (!ret) {
- if (vs->csock == -1) {
- vnc_disconnect_finish(vs);
- }
- return;
+ VNC_DEBUG("TLS Websocket connection required\n");
+ if (vs->ioc_tag) {
+ g_source_remove(vs->ioc_tag);
+ vs->ioc_tag = 0;
}
- vs->ws_input.offset += ret;
- handshake_end = (uint8_t *)g_strstr_len((char *)vs->ws_input.buffer,
- vs->ws_input.offset, WS_HANDSHAKE_END);
- if (handshake_end) {
- qemu_set_fd_handler(vs->csock, vnc_client_read, NULL, vs);
- vncws_process_handshake(vs, vs->ws_input.buffer, vs->ws_input.offset);
- buffer_advance(&vs->ws_input, handshake_end - vs->ws_input.buffer +
- strlen(WS_HANDSHAKE_END));
- } else if (vs->ws_input.offset >= 4096) {
- VNC_DEBUG("End of headers not found in first 4096 bytes\n");
+ tls = qio_channel_tls_new_server(
+ vs->ioc,
+ vs->vd->tlscreds,
+ vs->vd->tlsaclname,
+ &err);
+ if (!tls) {
+ VNC_DEBUG("Failed to setup TLS %s\n", error_get_pretty(err));
+ error_free(err);
vnc_client_error(vs);
+ return TRUE;
}
-}
-
-
-long vnc_client_read_ws(VncState *vs)
-{
- int ret, err;
- uint8_t *payload;
- size_t payload_size, header_size;
- VNC_DEBUG("Read websocket %p size %zd offset %zd\n", vs->ws_input.buffer,
- vs->ws_input.capacity, vs->ws_input.offset);
- buffer_reserve(&vs->ws_input, 4096);
- ret = vnc_client_read_buf(vs, buffer_end(&vs->ws_input), 4096);
- if (!ret) {
- return 0;
- }
- vs->ws_input.offset += ret;
- ret = 0;
- /* consume as much of ws_input buffer as possible */
- do {
- if (vs->ws_payload_remain == 0) {
- err = vncws_decode_frame_header(&vs->ws_input,
- &header_size,
- &vs->ws_payload_remain,
- &vs->ws_payload_mask);
- if (err <= 0) {
- return err;
- }
+ VNC_DEBUG("Start TLS WS handshake process\n");
+ object_unref(OBJECT(vs->ioc));
+ vs->ioc = QIO_CHANNEL(tls);
+ vs->tls = qio_channel_tls_get_session(tls);
- buffer_advance(&vs->ws_input, header_size);
- }
- if (vs->ws_payload_remain != 0) {
- err = vncws_decode_frame_payload(&vs->ws_input,
- &vs->ws_payload_remain,
- &vs->ws_payload_mask,
- &payload,
- &payload_size);
- if (err < 0) {
- return err;
- }
- if (err == 0) {
- return ret;
- }
- ret += err;
+ qio_channel_tls_handshake(tls,
+ vncws_tls_handshake_done,
+ vs,
+ NULL);
- buffer_reserve(&vs->input, payload_size);
- buffer_append(&vs->input, payload, payload_size);
-
- buffer_advance(&vs->ws_input, payload_size);
- }
- } while (vs->ws_input.offset > 0);
-
- return ret;
+ return TRUE;
}
-long vnc_client_write_ws(VncState *vs)
-{
- long ret;
- VNC_DEBUG("Write WS: Pending output %p size %zd offset %zd\n",
- vs->output.buffer, vs->output.capacity, vs->output.offset);
- vncws_encode_frame(&vs->ws_output, vs->output.buffer, vs->output.offset);
- buffer_reset(&vs->output);
- ret = vnc_client_write_buf(vs, vs->ws_output.buffer, vs->ws_output.offset);
- if (!ret) {
- return 0;
- }
-
- buffer_advance(&vs->ws_output, ret);
-
- if (vs->ws_output.offset == 0) {
- qemu_set_fd_handler(vs->csock, vnc_client_read, NULL, vs);
- }
-
- return ret;
-}
-static char *vncws_extract_handshake_entry(const char *handshake,
- size_t handshake_len, const char *name)
+static void vncws_handshake_done(Object *source,
+ Error *err,
+ gpointer user_data)
{
- char *begin, *end, *ret = NULL;
- char *line = g_strdup_printf("%s%s: ", WS_HANDSHAKE_DELIM, name);
- begin = g_strstr_len(handshake, handshake_len, line);
- if (begin != NULL) {
- begin += strlen(line);
- end = g_strstr_len(begin, handshake_len - (begin - handshake),
- WS_HANDSHAKE_DELIM);
- if (end != NULL) {
- ret = g_strndup(begin, end - begin);
- }
- }
- g_free(line);
- return ret;
-}
-
-static void vncws_send_handshake_response(VncState *vs, const char* key)
-{
- char combined_key[WS_CLIENT_KEY_LEN + WS_GUID_LEN + 1];
- char *accept = NULL, *response = NULL;
- Error *err = NULL;
-
- g_strlcpy(combined_key, key, WS_CLIENT_KEY_LEN + 1);
- g_strlcat(combined_key, WS_GUID, WS_CLIENT_KEY_LEN + WS_GUID_LEN + 1);
+ VncState *vs = user_data;
- /* hash and encode it */
- if (qcrypto_hash_base64(QCRYPTO_HASH_ALG_SHA1,
- combined_key,
- WS_CLIENT_KEY_LEN + WS_GUID_LEN,
- &accept,
- &err) < 0) {
- VNC_DEBUG("Hashing Websocket combined key failed %s\n",
- error_get_pretty(err));
- error_free(err);
+ if (err) {
+ VNC_DEBUG("Websock handshake failed %s\n", error_get_pretty(err));
vnc_client_error(vs);
- return;
- }
-
- response = g_strdup_printf(WS_HANDSHAKE, accept);
- vnc_client_write_buf(vs, (const uint8_t *)response, strlen(response));
-
- g_free(accept);
- g_free(response);
-
- vs->encode_ws = 1;
- vnc_init_state(vs);
-}
-
-void vncws_process_handshake(VncState *vs, uint8_t *line, size_t size)
-{
- char *protocols = vncws_extract_handshake_entry((const char *)line, size,
- "Sec-WebSocket-Protocol");
- char *version = vncws_extract_handshake_entry((const char *)line, size,
- "Sec-WebSocket-Version");
- char *key = vncws_extract_handshake_entry((const char *)line, size,
- "Sec-WebSocket-Key");
-
- if (protocols && version && key
- && g_strrstr(protocols, "binary")
- && !strcmp(version, WS_SUPPORTED_VERSION)
- && strlen(key) == WS_CLIENT_KEY_LEN) {
- vncws_send_handshake_response(vs, key);
} else {
- VNC_DEBUG("Defective Websockets header or unsupported protocol\n");
- vnc_client_error(vs);
+ VNC_DEBUG("Websock handshake complete, starting VNC protocol\n");
+ vnc_init_state(vs);
+ vs->ioc_tag = qio_channel_add_watch(
+ vs->ioc, G_IO_IN, vnc_client_io, vs, NULL);
}
-
- g_free(protocols);
- g_free(version);
- g_free(key);
}
-void vncws_encode_frame(Buffer *output, const void *payload,
- const size_t payload_size)
-{
- size_t header_size = 0;
- unsigned char opcode = WS_OPCODE_BINARY_FRAME;
- union {
- char buf[WS_HEAD_MAX_LEN];
- WsHeader ws;
- } header;
-
- if (!payload_size) {
- return;
- }
-
- header.ws.b0 = 0x80 | (opcode & 0x0f);
- if (payload_size <= 125) {
- header.ws.b1 = (uint8_t)payload_size;
- header_size = 2;
- } else if (payload_size < 65536) {
- header.ws.b1 = 0x7e;
- header.ws.u.s16.l16 = cpu_to_be16((uint16_t)payload_size);
- header_size = 4;
- } else {
- header.ws.b1 = 0x7f;
- header.ws.u.s64.l64 = cpu_to_be64(payload_size);
- header_size = 10;
- }
-
- buffer_reserve(output, header_size + payload_size);
- buffer_append(output, header.buf, header_size);
- buffer_append(output, payload, payload_size);
-}
-int vncws_decode_frame_header(Buffer *input,
- size_t *header_size,
- size_t *payload_remain,
- WsMask *payload_mask)
+gboolean vncws_handshake_io(QIOChannel *ioc G_GNUC_UNUSED,
+ GIOCondition condition G_GNUC_UNUSED,
+ void *opaque)
{
- unsigned char opcode = 0, fin = 0, has_mask = 0;
- size_t payload_len;
- WsHeader *header = (WsHeader *)input->buffer;
-
- if (input->offset < WS_HEAD_MIN_LEN + 4) {
- /* header not complete */
- return 0;
- }
-
- fin = (header->b0 & 0x80) >> 7;
- opcode = header->b0 & 0x0f;
- has_mask = (header->b1 & 0x80) >> 7;
- payload_len = header->b1 & 0x7f;
-
- if (opcode == WS_OPCODE_CLOSE) {
- /* disconnect */
- return -1;
- }
+ VncState *vs = opaque;
+ QIOChannelWebsock *wioc;
- /* Websocket frame sanity check:
- * * Websocket fragmentation is not supported.
- * * All websockets frames sent by a client have to be masked.
- * * Only binary encoding is supported.
- */
- if (!fin || !has_mask || opcode != WS_OPCODE_BINARY_FRAME) {
- VNC_DEBUG("Received faulty/unsupported Websocket frame\n");
- return -2;
+ VNC_DEBUG("Websocket negotiate starting\n");
+ if (vs->ioc_tag) {
+ g_source_remove(vs->ioc_tag);
+ vs->ioc_tag = 0;
}
- if (payload_len < 126) {
- *payload_remain = payload_len;
- *header_size = 6;
- *payload_mask = header->u.m;
- } else if (payload_len == 126 && input->offset >= 8) {
- *payload_remain = be16_to_cpu(header->u.s16.l16);
- *header_size = 8;
- *payload_mask = header->u.s16.m16;
- } else if (payload_len == 127 && input->offset >= 14) {
- *payload_remain = be64_to_cpu(header->u.s64.l64);
- *header_size = 14;
- *payload_mask = header->u.s64.m64;
- } else {
- /* header not complete */
- return 0;
- }
+ wioc = qio_channel_websock_new_server(vs->ioc);
- return 1;
-}
+ object_unref(OBJECT(vs->ioc));
+ vs->ioc = QIO_CHANNEL(wioc);
-int vncws_decode_frame_payload(Buffer *input,
- size_t *payload_remain, WsMask *payload_mask,
- uint8_t **payload, size_t *payload_size)
-{
- size_t i;
- uint32_t *payload32;
-
- *payload = input->buffer;
- /* If we aren't at the end of the payload, then drop
- * off the last bytes, so we're always multiple of 4
- * for purpose of unmasking, except at end of payload
- */
- if (input->offset < *payload_remain) {
- *payload_size = input->offset - (input->offset % 4);
- } else {
- *payload_size = *payload_remain;
- }
- if (*payload_size == 0) {
- return 0;
- }
- *payload_remain -= *payload_size;
-
- /* unmask frame */
- /* process 1 frame (32 bit op) */
- payload32 = (uint32_t *)(*payload);
- for (i = 0; i < *payload_size / 4; i++) {
- payload32[i] ^= payload_mask->u;
- }
- /* process the remaining bytes (if any) */
- for (i *= 4; i < *payload_size; i++) {
- (*payload)[i] ^= payload_mask->c[i % 4];
- }
+ qio_channel_websock_handshake(wioc,
+ vncws_handshake_done,
+ vs,
+ NULL);
- return 1;
+ return TRUE;
}
Code Review / kvmfornfv.git / blobdiff