X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=qemu%2Fui%2Fvnc-ws.c;h=7c79a4c3724d67aeb94447734ed28e272e87ca67;hb=a14b48d18a9ed03ec191cf16b162206998a895ce;hp=b4cb6bde70e1835b854ee25564345933874734ec;hpb=e44e3482bdb4d0ebde2d8b41830ac2cdb07948fb;p=kvmfornfv.git

diff --git a/qemu/ui/vnc-ws.c b/qemu/ui/vnc-ws.c
index b4cb6bde7..7c79a4c37 100644
--- a/qemu/ui/vnc-ws.c
+++ b/qemu/ui/vnc-ws.c
@@ -18,364 +18,108 @@
  * 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;
 }