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Annotation of qemu/ui/vnc-auth-vencrypt.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * QEMU VNC display driver: VeNCrypt authentication setup
        !             3:  *
        !             4:  * Copyright (C) 2006 Anthony Liguori <[email protected]>
        !             5:  * Copyright (C) 2006 Fabrice Bellard
        !             6:  * Copyright (C) 2009 Red Hat, Inc
        !             7:  *
        !             8:  * Permission is hereby granted, free of charge, to any person obtaining a copy
        !             9:  * of this software and associated documentation files (the "Software"), to deal
        !            10:  * in the Software without restriction, including without limitation the rights
        !            11:  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
        !            12:  * copies of the Software, and to permit persons to whom the Software is
        !            13:  * furnished to do so, subject to the following conditions:
        !            14:  *
        !            15:  * The above copyright notice and this permission notice shall be included in
        !            16:  * all copies or substantial portions of the Software.
        !            17:  *
        !            18:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
        !            19:  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
        !            20:  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
        !            21:  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
        !            22:  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
        !            23:  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
        !            24:  * THE SOFTWARE.
        !            25:  */
        !            26: 
        !            27: #include "vnc.h"
        !            28: 
        !            29: 
        !            30: static void start_auth_vencrypt_subauth(VncState *vs)
        !            31: {
        !            32:     switch (vs->vd->subauth) {
        !            33:     case VNC_AUTH_VENCRYPT_TLSNONE:
        !            34:     case VNC_AUTH_VENCRYPT_X509NONE:
        !            35:        VNC_DEBUG("Accept TLS auth none\n");
        !            36:        vnc_write_u32(vs, 0); /* Accept auth completion */
        !            37:        start_client_init(vs);
        !            38:        break;
        !            39: 
        !            40:     case VNC_AUTH_VENCRYPT_TLSVNC:
        !            41:     case VNC_AUTH_VENCRYPT_X509VNC:
        !            42:        VNC_DEBUG("Start TLS auth VNC\n");
        !            43:        start_auth_vnc(vs);
        !            44:        break;
        !            45: 
        !            46: #ifdef CONFIG_VNC_SASL
        !            47:     case VNC_AUTH_VENCRYPT_TLSSASL:
        !            48:     case VNC_AUTH_VENCRYPT_X509SASL:
        !            49:       VNC_DEBUG("Start TLS auth SASL\n");
        !            50:       return start_auth_sasl(vs);
        !            51: #endif /* CONFIG_VNC_SASL */
        !            52: 
        !            53:     default: /* Should not be possible, but just in case */
        !            54:        VNC_DEBUG("Reject subauth %d server bug\n", vs->vd->auth);
        !            55:        vnc_write_u8(vs, 1);
        !            56:        if (vs->minor >= 8) {
        !            57:            static const char err[] = "Unsupported authentication type";
        !            58:            vnc_write_u32(vs, sizeof(err));
        !            59:            vnc_write(vs, err, sizeof(err));
        !            60:        }
        !            61:        vnc_client_error(vs);
        !            62:     }
        !            63: }
        !            64: 
        !            65: static void vnc_tls_handshake_io(void *opaque);
        !            66: 
        !            67: static int vnc_start_vencrypt_handshake(struct VncState *vs) {
        !            68:     int ret;
        !            69: 
        !            70:     if ((ret = gnutls_handshake(vs->tls.session)) < 0) {
        !            71:        if (!gnutls_error_is_fatal(ret)) {
        !            72:            VNC_DEBUG("Handshake interrupted (blocking)\n");
        !            73:            if (!gnutls_record_get_direction(vs->tls.session))
        !            74:                qemu_set_fd_handler(vs->csock, vnc_tls_handshake_io, NULL, vs);
        !            75:            else
        !            76:                qemu_set_fd_handler(vs->csock, NULL, vnc_tls_handshake_io, vs);
        !            77:            return 0;
        !            78:        }
        !            79:        VNC_DEBUG("Handshake failed %s\n", gnutls_strerror(ret));
        !            80:        vnc_client_error(vs);
        !            81:        return -1;
        !            82:     }
        !            83: 
        !            84:     if (vs->vd->tls.x509verify) {
        !            85:         if (vnc_tls_validate_certificate(vs) < 0) {
        !            86:             VNC_DEBUG("Client verification failed\n");
        !            87:             vnc_client_error(vs);
        !            88:             return -1;
        !            89:         } else {
        !            90:             VNC_DEBUG("Client verification passed\n");
        !            91:         }
        !            92:     }
        !            93: 
        !            94:     VNC_DEBUG("Handshake done, switching to TLS data mode\n");
        !            95:     vs->tls.wiremode = VNC_WIREMODE_TLS;
        !            96:     qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, vnc_client_write, vs);
        !            97: 
        !            98:     start_auth_vencrypt_subauth(vs);
        !            99: 
        !           100:     return 0;
        !           101: }
        !           102: 
        !           103: static void vnc_tls_handshake_io(void *opaque) {
        !           104:     struct VncState *vs = (struct VncState *)opaque;
        !           105: 
        !           106:     VNC_DEBUG("Handshake IO continue\n");
        !           107:     vnc_start_vencrypt_handshake(vs);
        !           108: }
        !           109: 
        !           110: 
        !           111: 
        !           112: #define NEED_X509_AUTH(vs)                              \
        !           113:     ((vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509NONE ||   \
        !           114:      (vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509VNC ||    \
        !           115:      (vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509PLAIN ||  \
        !           116:      (vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509SASL)
        !           117: 
        !           118: 
        !           119: static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len)
        !           120: {
        !           121:     int auth = read_u32(data, 0);
        !           122: 
        !           123:     if (auth != vs->vd->subauth) {
        !           124:         VNC_DEBUG("Rejecting auth %d\n", auth);
        !           125:         vnc_write_u8(vs, 0); /* Reject auth */
        !           126:         vnc_flush(vs);
        !           127:         vnc_client_error(vs);
        !           128:     } else {
        !           129:         VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth);
        !           130:         vnc_write_u8(vs, 1); /* Accept auth */
        !           131:         vnc_flush(vs);
        !           132: 
        !           133:         if (vnc_tls_client_setup(vs, NEED_X509_AUTH(vs)) < 0) {
        !           134:             VNC_DEBUG("Failed to setup TLS\n");
        !           135:             return 0;
        !           136:         }
        !           137: 
        !           138:         VNC_DEBUG("Start TLS VeNCrypt handshake process\n");
        !           139:         if (vnc_start_vencrypt_handshake(vs) < 0) {
        !           140:             VNC_DEBUG("Failed to start TLS handshake\n");
        !           141:             return 0;
        !           142:         }
        !           143:     }
        !           144:     return 0;
        !           145: }
        !           146: 
        !           147: static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len)
        !           148: {
        !           149:     if (data[0] != 0 ||
        !           150:         data[1] != 2) {
        !           151:         VNC_DEBUG("Unsupported VeNCrypt protocol %d.%d\n", (int)data[0], (int)data[1]);
        !           152:         vnc_write_u8(vs, 1); /* Reject version */
        !           153:         vnc_flush(vs);
        !           154:         vnc_client_error(vs);
        !           155:     } else {
        !           156:         VNC_DEBUG("Sending allowed auth %d\n", vs->vd->subauth);
        !           157:         vnc_write_u8(vs, 0); /* Accept version */
        !           158:         vnc_write_u8(vs, 1); /* Number of sub-auths */
        !           159:         vnc_write_u32(vs, vs->vd->subauth); /* The supported auth */
        !           160:         vnc_flush(vs);
        !           161:         vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
        !           162:     }
        !           163:     return 0;
        !           164: }
        !           165: 
        !           166: 
        !           167: void start_auth_vencrypt(VncState *vs)
        !           168: {
        !           169:     /* Send VeNCrypt version 0.2 */
        !           170:     vnc_write_u8(vs, 0);
        !           171:     vnc_write_u8(vs, 2);
        !           172: 
        !           173:     vnc_read_when(vs, protocol_client_vencrypt_init, 2);
        !           174: }
        !           175: 

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