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xrdp/libxrdp/xrdp_rdp.c
matt335672 1917b9c747 Fix sending of monitor layout PDU 
From [MS-RCPBCGR] 3.3.5.12.1:-

> ...The contents of this PDU SHOULD NOT be compressed.
>
> This PDU MUST NOT be sent to a client that has not indicated support for
> it by setting the RNS_UD_CS_SUPPORT_MONITOR_LAYOUT_PDU flag (0x0040)
> in the earlyCapabilityFlags field of the Client Core Data (section
> 2.2.1.3.2).

Also, 2.2.12.1 specifies the source channel must be zero.

In testing, a compressed monitor layout PDU causes mstsc.exe
to exit with a protocol error.
2024-02-21 00:14:26 +09:00

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2014
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* rdp layer
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "libxrdp.h"
#include "ms-rdpbcgr.h"
#include "log.h"
#include "ssl_calls.h"
#include "string_calls.h"
#if defined(XRDP_NEUTRINORDP)
#include <freerdp/codec/rfx.h>
#include <freerdp/constants.h>
#endif
#define FASTPATH_FRAG_SIZE (16 * 1024 - 128)
/*****************************************************************************/
static int
xrdp_rdp_read_config(const char *xrdp_ini, struct xrdp_client_info *client_info)
{
int index = 0;
struct list *items = (struct list *)NULL;
struct list *values = (struct list *)NULL;
char *item = NULL;
char *value = NULL;
int pos;
char *tmp = NULL;
int tmp_length = 0;
client_info->xrdp_keyboard_overrides.type = -1;
client_info->xrdp_keyboard_overrides.subtype = -1;
client_info->xrdp_keyboard_overrides.layout = -1;
/* initialize (zero out) local variables: */
items = list_create();
items->auto_free = 1;
values = list_create();
values->auto_free = 1;
LOG_DEVEL(LOG_LEVEL_TRACE, "Reading config file %s", xrdp_ini);
file_by_name_read_section(xrdp_ini, "globals", items, values);
for (index = 0; index < items->count; index++)
{
item = (char *)list_get_item(items, index);
value = (char *)list_get_item(values, index);
LOG(LOG_LEVEL_DEBUG, "item %s, value %s", item, value);
if (g_strcasecmp(item, "bitmap_cache") == 0)
{
client_info->use_bitmap_cache = g_text2bool(value);
}
else if (g_strcasecmp(item, "bitmap_compression") == 0)
{
client_info->use_bitmap_comp = g_text2bool(value);
}
else if (g_strcasecmp(item, "bulk_compression") == 0)
{
client_info->use_bulk_comp = g_text2bool(value);
}
else if (g_strcasecmp(item, "crypt_level") == 0)
{
if (g_strcasecmp(value, "none") == 0)
{
client_info->crypt_level = 0;
}
else if (g_strcasecmp(value, "low") == 0)
{
client_info->crypt_level = 1;
}
else if (g_strcasecmp(value, "medium") == 0)
{
client_info->crypt_level = 2;
}
else if (g_strcasecmp(value, "high") == 0)
{
client_info->crypt_level = 3;
}
else if (g_strcasecmp(value, "fips") == 0)
{
client_info->crypt_level = 4;
}
else
{
LOG(LOG_LEVEL_WARNING, "Your configured crypt level is "
"undefined, 'high' will be used");
client_info->crypt_level = 3;
}
}
else if (g_strcasecmp(item, "allow_channels") == 0)
{
client_info->channels_allowed = g_text2bool(value);
if (client_info->channels_allowed == 0)
{
LOG(LOG_LEVEL_INFO, "All channels are disabled");
}
}
else if (g_strcasecmp(item, "allow_multimon") == 0)
{
client_info->multimon = g_text2bool(value);
if (client_info->multimon == 0)
{
LOG(LOG_LEVEL_INFO, "Multi monitor server support disabled");
}
}
else if (g_strcasecmp(item, "max_bpp") == 0)
{
client_info->max_bpp = g_atoi(value);
}
else if (g_strcasecmp(item, "rfx_min_pixel") == 0)
{
client_info->rfx_min_pixel = g_atoi(value);
}
else if (g_strcasecmp(item, "new_cursors") == 0)
{
client_info->pointer_flags = g_text2bool(value) == 0 ? 2 : 0;
}
else if (g_strcasecmp(item, "require_credentials") == 0)
{
client_info->require_credentials = g_text2bool(value);
}
else if (g_strcasecmp(item, "enable_token_login") == 0)
{
client_info->enable_token_login = g_text2bool(value);
}
else if (g_strcasecmp(item, "use_fastpath") == 0)
{
if (g_strcasecmp(value, "output") == 0)
{
client_info->use_fast_path = 1;
}
else if (g_strcasecmp(value, "input") == 0)
{
client_info->use_fast_path = 2;
}
else if (g_strcasecmp(value, "both") == 0)
{
client_info->use_fast_path = 3;
}
else if (g_strcasecmp(value, "none") == 0)
{
client_info->use_fast_path = 0;
}
else
{
LOG(LOG_LEVEL_WARNING, "Your configured fastpath level is "
"undefined, fastpath will not be used");
client_info->use_fast_path = 0;
}
}
else if (g_strcasecmp(item, "ssl_protocols") == 0)
{
/* put leading/trailing comma to properly detect "TLSv1" without regex */
tmp_length = g_strlen(value) + 3;
tmp = g_new(char, tmp_length);
g_snprintf(tmp, tmp_length, "%s%s%s", ",", value, ",");
/* replace all spaces with comma */
/* to accept space after comma */
while ((pos = g_pos(tmp, " ")) != -1)
{
tmp[pos] = ',';
}
ssl_get_protocols_from_string(tmp, &(client_info->ssl_protocols));
g_free(tmp);
}
else if (g_strcasecmp(item, "tls_ciphers") == 0)
{
client_info->tls_ciphers = g_strdup(value);
}
else if (g_strcasecmp(item, "security_layer") == 0)
{
if (g_strcasecmp(value, "rdp") == 0)
{
client_info->security_layer = PROTOCOL_RDP;
}
else if (g_strcasecmp(value, "tls") == 0)
{
client_info->security_layer = PROTOCOL_SSL;
}
else if (g_strcasecmp(value, "hybrid") == 0)
{
client_info->security_layer = PROTOCOL_SSL | PROTOCOL_HYBRID;
}
else if (g_strcasecmp(value, "negotiate") == 0)
{
client_info->security_layer = PROTOCOL_SSL | PROTOCOL_HYBRID | PROTOCOL_HYBRID_EX;
}
else
{
LOG(LOG_LEVEL_WARNING, "security_layer=%s is not "
"recognized, will use security_layer=negotiate",
value);
client_info->security_layer = PROTOCOL_SSL | PROTOCOL_HYBRID | PROTOCOL_HYBRID_EX;
}
}
else if (g_strcasecmp(item, "certificate") == 0)
{
g_memset(client_info->certificate, 0, sizeof(char) * 1024);
if (g_strlen(value) == 0)
{
/* default certificate path */
g_snprintf(client_info->certificate, 1023, "%s/cert.pem", XRDP_CFG_PATH);
LOG(LOG_LEVEL_INFO,
"Using default X.509 certificate: %s",
client_info->certificate);
}
else if (value[0] != '/')
{
/* default certificate path */
g_snprintf(client_info->certificate, 1023, "%s/cert.pem", XRDP_CFG_PATH);
LOG(LOG_LEVEL_WARNING,
"X.509 certificate should use absolute path, using "
"default instead: %s", client_info->certificate);
}
else
{
/* use user defined certificate */
g_strncpy(client_info->certificate, value, 1023);
}
if (!g_file_readable(client_info->certificate))
{
LOG(LOG_LEVEL_ERROR, "Cannot read certificate file %s: %s",
client_info->certificate, g_get_strerror());
}
}
else if (g_strcasecmp(item, "key_file") == 0)
{
g_memset(client_info->key_file, 0, sizeof(char) * 1024);
if (g_strlen(value) == 0)
{
/* default key_file path */
g_snprintf(client_info->key_file, 1023, "%s/key.pem", XRDP_CFG_PATH);
LOG(LOG_LEVEL_INFO, "Using default X.509 key file: %s",
client_info->key_file);
}
else if (value[0] != '/')
{
/* default key_file path */
g_snprintf(client_info->key_file, 1023, "%s/key.pem", XRDP_CFG_PATH);
LOG(LOG_LEVEL_WARNING,
"X.509 key file should use absolute path, using "
"default instead: %s", client_info->key_file);
}
else
{
/* use user defined key_file */
g_strncpy(client_info->key_file, value, 1023);
}
if (!g_file_readable(client_info->key_file))
{
LOG(LOG_LEVEL_ERROR, "Cannot read private key file %s: %s",
client_info->key_file, g_get_strerror());
}
}
else if (g_strcasecmp(item, "domain_user_separator") == 0
&& g_strlen(value) > 0)
{
g_strncpy(client_info->domain_user_separator, value, sizeof(client_info->domain_user_separator) - 1);
}
else if (g_strcasecmp(item, "xrdp.override_keyboard_type") == 0)
{
client_info->xrdp_keyboard_overrides.type = g_atoix(value);
}
else if (g_strcasecmp(item, "xrdp.override_keyboard_subtype") == 0)
{
client_info->xrdp_keyboard_overrides.subtype = g_atoix(value);
}
else if (g_strcasecmp(item, "xrdp.override_keylayout") == 0)
{
client_info->xrdp_keyboard_overrides.layout = g_atoix(value);
}
}
list_delete(items);
list_delete(values);
return 0;
}
#if defined(XRDP_NEUTRINORDP)
/*****************************************************************************/
static void
cpuid(tui32 info, tui32 *eax, tui32 *ebx, tui32 *ecx, tui32 *edx)
{
#ifdef __GNUC__
#if defined(__i386__) || defined(__x86_64__)
__asm volatile
(
/* The EBX (or RBX register on x86_64) is used for the PIC base address
and must not be corrupted by our inline assembly. */
#if defined(__i386__)
"mov %%ebx, %%esi;"
"cpuid;"
"xchg %%ebx, %%esi;"
#else
"mov %%rbx, %%rsi;"
"cpuid;"
"xchg %%rbx, %%rsi;"
#endif
: "=a" (*eax), "=S" (*ebx), "=c" (*ecx), "=d" (*edx)
: "0" (info)
);
#endif
#endif
}
/*****************************************************************************/
static tui32
xrdp_rdp_detect_cpu(void)
{
tui32 eax;
tui32 ebx;
tui32 ecx;
tui32 edx;
tui32 cpu_opt;
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
cpu_opt = 0;
cpuid(1, &eax, &ebx, &ecx, &edx);
if (edx & (1 << 26))
{
LOG_DEVEL(LOG_LEVEL_TRACE, "SSE2 detected");
cpu_opt |= CPU_SSE2;
}
return cpu_opt;
}
#endif
/*****************************************************************************/
struct xrdp_rdp *
xrdp_rdp_create(struct xrdp_session *session, struct trans *trans)
{
struct xrdp_rdp *self = (struct xrdp_rdp *)NULL;
LOG_DEVEL(LOG_LEVEL_TRACE, "in xrdp_rdp_create");
self = (struct xrdp_rdp *)g_malloc(sizeof(struct xrdp_rdp), 1);
self->session = session;
self->share_id = 66538;
/* read ini settings */
xrdp_rdp_read_config(session->xrdp_ini, &self->client_info);
/* create sec layer */
self->sec_layer = xrdp_sec_create(self, trans);
/* default 8 bit v1 color bitmap cache entries and size */
self->client_info.cache1_entries = 600;
self->client_info.cache1_size = 256;
self->client_info.cache2_entries = 300;
self->client_info.cache2_size = 1024;
self->client_info.cache3_entries = 262;
self->client_info.cache3_size = 4096;
/* load client ip info */
g_sck_get_peer_ip_address(trans->sck,
self->client_info.client_ip,
sizeof(self->client_info.client_ip),
NULL);
g_sck_get_peer_description(trans->sck,
self->client_info.client_description,
sizeof(self->client_info.client_description));
self->mppc_enc = mppc_enc_new(PROTO_RDP_50);
#if defined(XRDP_NEUTRINORDP)
self->rfx_enc = rfx_context_new();
rfx_context_set_cpu_opt(self->rfx_enc, xrdp_rdp_detect_cpu());
#endif
self->client_info.size = sizeof(self->client_info);
self->client_info.version = CLIENT_INFO_CURRENT_VERSION;
LOG_DEVEL(LOG_LEVEL_TRACE, "out xrdp_rdp_create");
return self;
}
/*****************************************************************************/
void
xrdp_rdp_delete(struct xrdp_rdp *self)
{
if (self == 0)
{
return;
}
xrdp_sec_delete(self->sec_layer);
mppc_enc_free(self->mppc_enc);
#if defined(XRDP_NEUTRINORDP)
rfx_context_free((RFX_CONTEXT *)(self->rfx_enc));
#endif
g_free(self->client_info.tls_ciphers);
g_free(self);
}
/*****************************************************************************/
/* Initialize the stream for sending a [MS-RDPBCGR] Control PDU */
int
xrdp_rdp_init(struct xrdp_rdp *self, struct stream *s)
{
if (xrdp_sec_init(self->sec_layer, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_init: xrdp_sec_init failed");
return 1;
}
s_push_layer(s, rdp_hdr, 6); /* 6 = sizeof(TS_SHARECONTROLHEADER) */
return 0;
}
/*****************************************************************************/
/* Initialize the stream for sending a [MS-RDPBCGR] Data PDU */
int
xrdp_rdp_init_data(struct xrdp_rdp *self, struct stream *s)
{
if (xrdp_sec_init(self->sec_layer, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_init_data: xrdp_sec_init failed");
return 1;
}
s_push_layer(s, rdp_hdr, 18); /* 18 = sizeof(TS_SHAREDATAHEADER) */
return 0;
}
/*****************************************************************************/
/*
Receives and parses pdu code from next data unit.
@param self
@param (in/out) s: the stream to read from. Upon return the stream is ?
@param (out) code: the pdu code from the packet
returns error
*/
int
xrdp_rdp_recv(struct xrdp_rdp *self, struct stream *s, int *code)
{
int error = 0;
int len = 0;
int pdu_code = 0;
int chan = 0;
const tui8 *header;
if (s->next_packet == 0 || s->next_packet >= s->end)
{
/* check for fastpath first */
header = (const tui8 *) (s->p);
if (header[0] != 0x3)
{
if (xrdp_sec_recv_fastpath(self->sec_layer, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_recv: xrdp_sec_recv_fastpath failed");
return 1;
}
/* next_packet gets set in xrdp_sec_recv_fastpath */
*code = 2; // special code for fastpath input
LOG_DEVEL(LOG_LEVEL_DEBUG, "xrdp_rdp_recv: out code 2 (fastpath)");
return 0;
}
/* not fastpath, do tpkt */
chan = 0;
error = xrdp_sec_recv(self->sec_layer, s, &chan);
if (error == -1) /* special code for send demand active */
{
s->next_packet = 0;
*code = -1;
LOG_DEVEL(LOG_LEVEL_DEBUG, "xrdp_rdp_recv: out code -1 (send demand active)");
return 0;
}
if (error != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_recv: xrdp_sec_recv failed");
return 1;
}
if ((chan != MCS_GLOBAL_CHANNEL) && (chan > 0))
{
if (chan > MCS_GLOBAL_CHANNEL)
{
if (xrdp_channel_process(self->sec_layer->chan_layer, s, chan) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_recv: xrdp_channel_process failed");
}
}
else
{
if (chan != 1)
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"xrdp_rdp_recv: Wrong channel Id to be handled "
"by xrdp_channel_process, channel id %d", chan);
}
}
s->next_packet = 0;
*code = 0;
LOG_DEVEL(LOG_LEVEL_DEBUG, "xrdp_rdp_recv: out code 0 (skip data) "
"data processed by channel id %d", chan);
return 0;
}
s->next_packet = s->p;
}
else
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "xrdp_rdp_recv: stream not touched");
s->p = s->next_packet;
}
if (!s_check_rem_and_log(s, 6, "Parsing [MS-RDPBCGR] TS_SHARECONTROLHEADER"))
{
s->next_packet = 0;
*code = 0;
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_recv: out code 0 (skip data) "
"bad RDP packet");
return 0;
}
else
{
in_uint16_le(s, len); /* totalLength */
in_uint16_le(s, pdu_code); /* pduType */
*code = pdu_code & 0xf;
in_uint8s(s, 2); /* pduSource */
s->next_packet += len;
LOG_DEVEL(LOG_LEVEL_TRACE, "Received header [MS-RDPBCGR] TS_SHARECONTROLHEADER "
"totalLength %d, pduType.type %s (%d), pduType.PDUVersion %d, "
"pduSource (ignored)", len, PDUTYPE_TO_STR(*code), *code,
((pdu_code & 0xfff0) >> 4));
return 0;
}
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] Control PDU with for the given pduType with the headers
added */
int
xrdp_rdp_send(struct xrdp_rdp *self, struct stream *s, int pdu_type)
{
int len = 0;
s_pop_layer(s, rdp_hdr);
len = s->end - s->p;
/* TS_SHARECONTROLHEADER */
out_uint16_le(s, len); /* totalLength */
out_uint16_le(s, 0x10 | pdu_type); /* pduType */
out_uint16_le(s, self->mcs_channel); /* pduSource */
LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [MS-RDPBCGR] TS_SHARECONTROLHEADER "
"totalLength %d, pduType.type %s (%d), pduType.PDUVersion %d, "
"pduSource %d", len, PDUTYPE_TO_STR(pdu_type & 0xf),
pdu_type & 0xf, (((0x10 | pdu_type) & 0xfff0) >> 4),
self->mcs_channel);
if (xrdp_sec_send(self->sec_layer, s, MCS_GLOBAL_CHANNEL) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send: xrdp_sec_send failed");
return 1;
}
return 0;
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] Data PDU for the given pduType2 from
* the specified source with the headers
added and data compressed */
int
xrdp_rdp_send_data_from_channel(struct xrdp_rdp *self, struct stream *s,
int data_pdu_type, int channel_id,
int compress)
{
int len;
int ctype;
int clen;
int dlen;
int pdulen;
int pdutype;
int tocomplen;
int iso_offset;
int mcs_offset;
int sec_offset;
int rdp_offset;
struct stream ls;
struct xrdp_mppc_enc *mppc_enc;
s_pop_layer(s, rdp_hdr);
len = (int)(s->end - s->p);
pdutype = 0x10 | PDUTYPE_DATAPDU;
pdulen = len;
dlen = len;
ctype = 0;
clen = len;
tocomplen = pdulen - 18;
if (compress && self->client_info.rdp_compression &&
self->session->up_and_running)
{
mppc_enc = self->mppc_enc;
if (compress_rdp(mppc_enc, (tui8 *)(s->p + 18), tocomplen))
{
clen = mppc_enc->bytes_in_opb + 18;
pdulen = clen;
ctype = mppc_enc->flags;
iso_offset = (int)(s->iso_hdr - s->data);
mcs_offset = (int)(s->mcs_hdr - s->data);
sec_offset = (int)(s->sec_hdr - s->data);
rdp_offset = (int)(s->rdp_hdr - s->data);
/* outputBuffer has 64 bytes preceding it */
ls.data = mppc_enc->outputBuffer - (rdp_offset + 18);
ls.p = ls.data + rdp_offset;
ls.end = ls.p + clen;
ls.size = s->end - s->data;
ls.iso_hdr = ls.data + iso_offset;
ls.mcs_hdr = ls.data + mcs_offset;
ls.sec_hdr = ls.data + sec_offset;
ls.rdp_hdr = ls.data + rdp_offset;
ls.channel_hdr = 0;
ls.next_packet = 0;
s = &ls;
}
else
{
LOG_DEVEL(LOG_LEVEL_TRACE,
"xrdp_rdp_send_data_from_channel: "
"compress_rdp failed, sending "
"uncompressed data. type %d, flags %d",
mppc_enc->protocol_type, mppc_enc->flags);
}
}
/* TS_SHARECONTROLHEADER */
out_uint16_le(s, pdulen); /* totalLength */
out_uint16_le(s, pdutype); /* pduType */
out_uint16_le(s, channel_id); /* pduSource */
LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [MS-RDPBCGR] TS_SHARECONTROLHEADER "
"totalLength %d, pduType.type %s (%d), pduType.PDUVersion %d, "
"pduSource %d", pdulen, PDUTYPE_TO_STR(pdutype & 0xf),
pdutype & 0xf, ((pdutype & 0xfff0) >> 4), channel_id);
/* TS_SHAREDATAHEADER */
out_uint32_le(s, self->share_id);
out_uint8(s, 0); /* pad */
out_uint8(s, 1); /* streamID */
out_uint16_le(s, dlen); /* uncompressedLength */
out_uint8(s, data_pdu_type); /* pduType2 */
out_uint8(s, ctype); /* compressedType */
out_uint16_le(s, clen); /* compressedLength */
LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [MS-RDPBCGR] TS_SHAREDATAHEADER "
"shareID %d, streamID 1, uncompressedLength %d, "
"pduType2 0x%2.2x, compressedType 0x%2.2x, compressedLength %d",
self->share_id, dlen, data_pdu_type, ctype, clen);
if (xrdp_sec_send(self->sec_layer, s, MCS_GLOBAL_CHANNEL) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_data_from_channel: "
"xrdp_sec_send failed");
return 1;
}
return 0;
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] Data PDU on the MCS channel for the given pduType2
* with the headers added and data compressed */
int
xrdp_rdp_send_data(struct xrdp_rdp *self, struct stream *s,
int data_pdu_type)
{
return xrdp_rdp_send_data_from_channel(self, s, data_pdu_type,
self->mcs_channel, 1);
}
/*****************************************************************************/
/* returns the fastpath rdp byte count */
int
xrdp_rdp_get_fastpath_bytes(struct xrdp_rdp *self)
{
if (self->client_info.rdp_compression)
{
return 4;
}
return 3;
}
/*****************************************************************************/
int
xrdp_rdp_init_fastpath(struct xrdp_rdp *self, struct stream *s)
{
if (xrdp_sec_init_fastpath(self->sec_layer, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_init_fastpath: xrdp_sec_init_fastpath failed");
return 1;
}
if (self->client_info.rdp_compression)
{
s_push_layer(s, rdp_hdr, 4);
}
else
{
s_push_layer(s, rdp_hdr, 3);
}
return 0;
}
/*****************************************************************************/
/* returns error */
/* 2.2.9.1.2.1 Fast-Path Update (TS_FP_UPDATE)
* http://msdn.microsoft.com/en-us/library/cc240622.aspx */
int
xrdp_rdp_send_fastpath(struct xrdp_rdp *self, struct stream *s,
int data_pdu_type)
{
int updateHeader;
int updateCode;
int fragmentation;
int compression;
int comp_type;
int comp_len;
int no_comp_len;
int send_len;
int cont;
int header_bytes;
int sec_bytes;
int to_comp_len;
int sec_offset;
int rdp_offset;
struct stream frag_s;
struct stream comp_s;
struct stream send_s;
struct xrdp_mppc_enc *mppc_enc;
char comp_type_str[7];
comp_type_str[0] = '\0';
s_pop_layer(s, rdp_hdr);
updateCode = data_pdu_type;
if (self->client_info.rdp_compression)
{
compression = 2;
header_bytes = 4;
}
else
{
compression = 0;
header_bytes = 3;
}
sec_bytes = xrdp_sec_get_fastpath_bytes(self->sec_layer);
fragmentation = 0;
frag_s = *s;
sec_offset = (int)(frag_s.sec_hdr - frag_s.data);
rdp_offset = (int)(frag_s.rdp_hdr - frag_s.data);
cont = 1;
while (cont)
{
comp_type = 0;
send_s = frag_s;
no_comp_len = (int)(frag_s.end - frag_s.p);
if (no_comp_len > FASTPATH_FRAG_SIZE)
{
no_comp_len = FASTPATH_FRAG_SIZE;
if (fragmentation == 0)
{
fragmentation = 2; /* FASTPATH_FRAGMENT_FIRST */
}
else if (fragmentation == 2)
{
fragmentation = 3; /* FASTPATH_FRAGMENT_NEXT */
}
}
else
{
if (fragmentation != 0)
{
fragmentation = 1; /* FASTPATH_FRAGMENT_LAST */
}
}
send_len = no_comp_len;
LOG_DEVEL(LOG_LEVEL_DEBUG, "xrdp_rdp_send_fastpath: no_comp_len %d, fragmentation %d",
no_comp_len, fragmentation);
if ((compression != 0) && (no_comp_len > header_bytes + 16))
{
to_comp_len = no_comp_len - header_bytes;
mppc_enc = self->mppc_enc;
if (compress_rdp(mppc_enc, (tui8 *)(frag_s.p + header_bytes),
to_comp_len))
{
comp_len = mppc_enc->bytes_in_opb + header_bytes;
send_len = comp_len;
comp_type = mppc_enc->flags;
/* outputBuffer has 64 bytes preceding it */
g_memset(&comp_s, 0, sizeof(comp_s));
comp_s.data = mppc_enc->outputBuffer -
(rdp_offset + header_bytes);
comp_s.p = comp_s.data + rdp_offset;
comp_s.end = comp_s.p + send_len;
comp_s.size = send_len;
comp_s.sec_hdr = comp_s.data + sec_offset;
comp_s.rdp_hdr = comp_s.data + rdp_offset;
send_s = comp_s;
}
else
{
LOG(LOG_LEVEL_DEBUG,
"compress_rdp failed, sending uncompressed data. "
"type %d, flags %d", mppc_enc->protocol_type,
mppc_enc->flags);
}
}
updateHeader = (updateCode & 15) |
((fragmentation & 3) << 4) |
((compression & 3) << 6);
send_s.end = send_s.p + send_len;
send_s.size = send_s.end - send_s.data;
out_uint8(&send_s, updateHeader);
if (compression != 0)
{
out_uint8(&send_s, comp_type);
g_snprintf(comp_type_str, 7, "0x%4.4x", comp_type);
}
send_len -= header_bytes;
out_uint16_le(&send_s, send_len);
LOG_DEVEL(LOG_LEVEL_TRACE, "Adding header [MS-RDPBCGR] TS_FP_UPDATE "
"updateCode %d, fragmentation %d, compression %d, compressionFlags %s, size %d",
updateCode, fragmentation, compression,
(compression ? comp_type_str : "(not present)"), send_len);
if (xrdp_sec_send_fastpath(self->sec_layer, &send_s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_fastpath: xrdp_sec_send_fastpath failed");
return 1;
}
frag_s.p += no_comp_len;
cont = frag_s.p < frag_s.end;
frag_s.p -= header_bytes;
frag_s.sec_hdr = frag_s.p - sec_bytes;
frag_s.data = frag_s.sec_hdr;
}
return 0;
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] TS_UPDATE_SYNC or TS_FP_UPDATE_SYNCHRONIZE message
depending on if the client supports the fast path capability or not */
int
xrdp_rdp_send_data_update_sync(struct xrdp_rdp *self)
{
struct stream *s = (struct stream *)NULL;
make_stream(s);
init_stream(s, 8192);
if (self->client_info.use_fast_path & 1) /* fastpath output supported */
{
if (xrdp_rdp_init_fastpath(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_data_update_sync: xrdp_rdp_init_fastpath failed");
free_stream(s);
return 1;
}
}
else /* slowpath */
{
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_data_update_sync: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
out_uint16_le(s, RDP_UPDATE_SYNCHRONIZE); /* updateType */
out_uint16_le(s, 0); /* pad */
}
s_mark_end(s);
if (self->client_info.use_fast_path & 1) /* fastpath output supported */
{
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_FP_UPDATE_SYNCHRONIZE");
if (xrdp_rdp_send_fastpath(self, s,
FASTPATH_UPDATETYPE_SYNCHRONIZE) != 0)
{
LOG(LOG_LEVEL_ERROR, "Sending [MS-RDPBCGR] TS_FP_UPDATE_SYNCHRONIZE failed");
free_stream(s);
return 1;
}
}
else /* slowpath */
{
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_UPDATE_SYNC "
"updateType %s (%d)",
GRAPHICS_UPDATE_TYPE_TO_STR(RDP_UPDATE_SYNCHRONIZE),
RDP_UPDATE_SYNCHRONIZE);
if (xrdp_rdp_send_data(self, s, RDP_DATA_PDU_UPDATE) != 0)
{
LOG(LOG_LEVEL_ERROR, "Sending [MS-RDPBCGR] TS_UPDATE_SYNC failed");
free_stream(s);
return 1;
}
}
free_stream(s);
return 0;
}
/*****************************************************************************/
int
xrdp_rdp_incoming(struct xrdp_rdp *self)
{
struct xrdp_iso *iso;
iso = self->sec_layer->mcs_layer->iso_layer;
if (xrdp_sec_incoming(self->sec_layer) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_incoming: xrdp_sec_incoming failed");
return 1;
}
self->mcs_channel = self->sec_layer->mcs_layer->userid +
MCS_USERCHANNEL_BASE;
LOG_DEVEL(LOG_LEVEL_DEBUG, "xrdp_rdp->mcs_channel %d", self->mcs_channel);
/* log TLS version and cipher of TLS connections */
if (iso->selectedProtocol > PROTOCOL_RDP)
{
LOG(LOG_LEVEL_INFO,
"TLS connection established from %s %s with cipher %s",
self->client_info.client_description,
iso->trans->ssl_protocol,
iso->trans->cipher_name);
}
/* log non-TLS connections */
else
{
int crypt_level = self->sec_layer->crypt_level;
const char *security_level =
(crypt_level == CRYPT_LEVEL_NONE) ? "none" :
(crypt_level == CRYPT_LEVEL_LOW) ? "low" :
(crypt_level == CRYPT_LEVEL_CLIENT_COMPATIBLE) ? "medium" :
(crypt_level == CRYPT_LEVEL_HIGH) ? "high" :
(crypt_level == CRYPT_LEVEL_FIPS) ? "fips" :
/* default */ "unknown";
LOG(LOG_LEVEL_INFO,
"Non-TLS connection established from %s with security level : %s",
self->client_info.client_description, security_level);
}
return 0;
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_POINTER_PDU message */
static int
xrdp_rdp_process_data_pointer(struct xrdp_rdp *self, struct stream *s)
{
LOG_DEVEL(LOG_LEVEL_WARNING, "Protocol error ignored: a [MS-RDPBCGR] "
"TS_SHAREDATAHEADER PDUTYPE2_POINTER was received by the server "
"but this type of PDU is only suppose to be sent by the server "
"to the client.");
return 0;
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_INPUT_PDU_DATA message */
static int
xrdp_rdp_process_data_input(struct xrdp_rdp *self, struct stream *s)
{
int num_events;
int index;
int msg_type;
int device_flags;
int param1;
int param2;
int time;
if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPBCGR] TS_INPUT_PDU_DATA"))
{
return 1;
}
in_uint16_le(s, num_events);
in_uint8s(s, 2); /* pad */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_INPUT_PDU_DATA "
"numEvents %d", num_events);
for (index = 0; index < num_events; index++)
{
if (!s_check_rem_and_log(s, 12, "Parsing [MS-RDPBCGR] TS_INPUT_EVENT"))
{
return 1;
}
in_uint32_le(s, time);
in_uint16_le(s, msg_type);
in_uint16_le(s, device_flags);
in_sint16_le(s, param1);
in_sint16_le(s, param2);
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_INPUT_EVENT "
"eventTime %d, messageType 0x%4.4x", time, msg_type);
switch (msg_type)
{
case RDP_INPUT_SYNCHRONIZE:
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_INPUT_EVENT - TS_SYNC_EVENT "
"toggleFlags 0x%8.8x", ((param2 << 16) | param1));
break;
case RDP_INPUT_SCANCODE:
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_INPUT_EVENT - TS_KEYBOARD_EVENT "
"keyboardFlags 0x%4.4x, keyCode %d", device_flags, param1);
break;
case RDP_INPUT_UNICODE:
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_INPUT_EVENT - TS_UNICODE_KEYBOARD_EVENT "
"keyboardFlags 0x%4.4x, unicodeCode %d", device_flags, param1);
break;
case RDP_INPUT_MOUSE:
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_INPUT_EVENT - TS_POINTER_EVENT "
"pointerFlags 0x%4.4x, xPos %d, yPos %d",
device_flags, param1, param2);
break;
case RDP_INPUT_MOUSEX:
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_INPUT_EVENT - TS_POINTERX_EVENT "
"pointerFlags 0x%4.4x, xPos %d, yPos %d",
device_flags, param1, param2);
break;
default:
LOG_DEVEL(LOG_LEVEL_WARNING, "Received unknown [MS-RDPBCGR] TS_INPUT_EVENT "
"messageType 0x%4.4x", msg_type);
break;
}
if (self->session->callback != 0)
{
/* msg_type can be
RDP_INPUT_SYNCHRONIZE - 0
RDP_INPUT_SCANCODE - 4
RDP_INPUT_MOUSE - 0x8001
RDP_INPUT_MOUSEX - 0x8002 */
/* call to xrdp_wm.c : callback */
self->session->callback(self->session->id, msg_type, param1, param2,
device_flags, time);
}
else
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"Bug: no callback registered for xrdp_rdp_process_data_input");
}
}
LOG_DEVEL(LOG_LEVEL_DEBUG, "Processing [MS-RDPBCGR] TS_INPUT_PDU_DATA complete");
return 0;
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] TS_SYNCHRONIZE_PDU message */
static int
xrdp_rdp_send_synchronise(struct xrdp_rdp *self)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_synchronise: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
out_uint16_le(s, 1); /* messageType (2 bytes) */
out_uint16_le(s, 1002); /* targetUser (2 bytes) */
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_SYNCHRONIZE_PDU "
"messageType 1, targetUser 1002");
if (xrdp_rdp_send_data(self, s, RDP_DATA_PDU_SYNCHRONISE) != 0)
{
LOG(LOG_LEVEL_ERROR, "Sending [MS-RDPBCGR] TS_SYNCHRONIZE_PDU failed");
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] TS_CONTROL_PDU message */
static int
xrdp_rdp_send_control(struct xrdp_rdp *self, int action)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_control: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
out_uint16_le(s, action);
out_uint16_le(s, 0); /* userid */
out_uint32_le(s, 1002); /* control id */
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_CONTROL_PDU "
"action %d, grantId 0, controlId 1002", action);
if (xrdp_rdp_send_data(self, s, RDP_DATA_PDU_CONTROL) != 0)
{
LOG(LOG_LEVEL_ERROR, "Sending [MS-RDPBCGR] TS_CONTROL_PDU failed");
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_CONTROL_PDU message */
static int
xrdp_rdp_process_data_control(struct xrdp_rdp *self, struct stream *s)
{
int action;
in_uint16_le(s, action);
in_uint8s(s, 2); /* user id */
in_uint8s(s, 4); /* control id */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_CONTROL_PDU "
"action 0x%4.4x, grantId (ignored), controlId (ignored)",
action);
if (action == RDP_CTL_REQUEST_CONTROL)
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "Responding to [MS-RDPBCGR] TS_CONTROL_PDU "
"action CTRLACTION_REQUEST_CONTROL with 3 messages: "
"TS_SYNCHRONIZE_PDU, TS_CONTROL_PDU with CTRLACTION_COOPERATE, "
" and TS_CONTROL_PDU with CTRLACTION_GRANTED_CONTROL");
xrdp_rdp_send_synchronise(self);
xrdp_rdp_send_control(self, RDP_CTL_COOPERATE);
xrdp_rdp_send_control(self, RDP_CTL_GRANT_CONTROL);
}
else
{
LOG_DEVEL(LOG_LEVEL_WARNING, "Received [MS-RDPBCGR] TS_CONTROL_PDU "
"action %d is unknown (skipped)", action);
}
return 0;
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_SYNCHRONIZE_PDU message */
static int
xrdp_rdp_process_data_sync(struct xrdp_rdp *self)
{
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_SYNCHRONIZE_PDU - no-op");
return 0;
}
/*****************************************************************************/
/* 2.2.11.2.1 Refresh Rect PDU Data (TS_REFRESH_RECT_PDU) */
static int
xrdp_rdp_process_screen_update(struct xrdp_rdp *self, struct stream *s)
{
int index;
int num_rects;
int left;
int top;
int right;
int bottom;
int cx;
int cy;
if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPBCGR] TS_REFRESH_RECT_PDU"))
{
return 1;
}
in_uint8(s, num_rects);
in_uint8s(s, 3); /* pad */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_REFRESH_RECT_PDU "
"numberOfAreas %d", num_rects);
for (index = 0; index < num_rects; index++)
{
if (!s_check_rem_and_log(s, 8, "Parsing [MS-RDPBCGR] TS_RECTANGLE16"))
{
return 1;
}
/* Inclusive Rectangle (TS_RECTANGLE16) */
in_uint16_le(s, left);
in_uint16_le(s, top);
in_uint16_le(s, right);
in_uint16_le(s, bottom);
LOG_DEVEL(LOG_LEVEL_TRACE, "With field [MS-RDPBCGR] TS_RECTANGLE16 "
"left %d, top %d, right %d, bottom %d",
left, top, right, bottom);
cx = (right - left) + 1;
cy = (bottom - top) + 1;
if (self->session->callback != 0)
{
self->session->callback(self->session->id, 0x4444,
left, top, cx, cy);
}
else
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"Bug: no callback registered for xrdp_rdp_process_screen_update");
}
}
return 0;
}
/*****************************************************************************/
/* Send a [MS-RDPBCGR] TS_FONT_MAP_PDU message */
static int
xrdp_rdp_send_fontmap(struct xrdp_rdp *self)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR,
"xrdp_rdp_send_fontmap: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
out_uint16_le(s, 0); /* numberEntries */
out_uint16_le(s, 0); /* totalNumEntries */
out_uint16_le(s, 0x3); /* mapFlags (sequence flags) */
out_uint16_le(s, 0x4); /* entrySize */
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_FONT_MAP_PDU "
"numberEntries 0, totalNumEntries 0, mapFlags 0x0003, entrySize 4");
if (xrdp_rdp_send_data(self, s, 0x28) != 0)
{
LOG(LOG_LEVEL_ERROR,
"Sending [MS-RDPBCGR] TS_FONT_MAP_PDU failed");
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_FONT_LIST_PDU message */
static int
xrdp_rdp_process_data_font(struct xrdp_rdp *self, struct stream *s)
{
int seq;
if (!s_check_rem_and_log(s, 6, "Parsing [MS-RDPBCGR] TS_FONT_LIST_PDU"))
{
return 1;
}
in_uint8s(s, 2); /* NumberFonts: 0x0, SHOULD be set to 0 */
in_uint8s(s, 2); /* TotalNumberFonts: 0x0, SHOULD be set to 0 */
in_uint16_le(s, seq); /* ListFlags */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_FONT_LIST_PDU "
"numberFonts (ignored), totalNumFonts (ignored), listFlags 0x%4.4x",
seq);
/* 419 client sends Seq 1, then 2 */
/* 2600 clients sends only Seq 3 */
/* listFlags SHOULD be set to 0x0003, which is the logical OR'd value of
FONTLIST_FIRST (0x0001) and FONTLIST_LAST (0x0002) */
if (seq == 2 || seq == 3) /* after second font message, we are up and */
{
/* running */
LOG_DEVEL(LOG_LEVEL_DEBUG,
"Client sent FONTLIST_LAST, replying with server fontmap");
xrdp_rdp_send_fontmap(self);
self->session->up_and_running = 1;
LOG_DEVEL(LOG_LEVEL_INFO, "yeah, up_and_running");
xrdp_rdp_send_data_update_sync(self);
/* This is also the end of an Deactivation-reactivation
* sequence [MS-RDPBCGR] 1.3.1.3 */
xrdp_rdp_suppress_output(self, 0, XSO_REASON_DEACTIVATE_REACTIVATE,
0, 0,
self->client_info.display_sizes.session_width,
self->client_info.display_sizes.session_height);
if (self->session->callback != 0)
{
/* call to xrdp_wm.c : callback */
self->session->callback(self->session->id, 0x555a, 0, 0,
0, 0);
}
xrdp_channel_drdynvc_start(self->sec_layer->chan_layer);
}
else
{
LOG_DEVEL(LOG_LEVEL_DEBUG, "Received [MS-RDPBCGR] TS_FONT_LIST_PDU "
"without FONTLIST_LAST in the listFlags field. Ignoring message.");
}
return 0;
}
/*****************************************************************************/
/* Send a Sending [MS-RDPBCGR] TS_SHUTDOWN_DENIED_PDU message */
static int
xrdp_rdp_send_disconnect_query_response(struct xrdp_rdp *self)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR,
"xrdp_rdp_send_disconnect_query_response: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_SHUTDOWN_DENIED_PDU");
if (xrdp_rdp_send_data(self, s, PDUTYPE2_SHUTDOWN_DENIED) != 0)
{
LOG(LOG_LEVEL_ERROR,
"Sending [MS-RDPBCGR] TS_SHUTDOWN_DENIED_PDU failed");
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
#if 0 /* not used */
/*****************************************************************************/
/* Send a [MS-RDPBCGR] TS_SET_ERROR_INFO_PDU message */
static int
xrdp_rdp_send_disconnect_reason(struct xrdp_rdp *self, int reason)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR,
"xrdp_rdp_send_disconnect_reason: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
out_uint32_le(s, reason);
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_SET_ERROR_INFO_PDU "
"errorInfo 0x%8.8x", reason);
if (xrdp_rdp_send_data(self, s, RDP_DATA_PDU_DISCONNECT) != 0)
{
LOG(LOG_LEVEL_ERROR,
"Sending [MS-RDPBCGR] TS_SET_ERROR_INFO_PDU failed");
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
#endif
/*****************************************************************************/
/* Process a [MS-RDPRFX] TS_FRAME_ACKNOWLEDGE_PDU message */
static int
xrdp_rdp_process_frame_ack(struct xrdp_rdp *self, struct stream *s)
{
int frame_id;
if (!s_check_rem_and_log(s, 4, "Parsing [MS-RDPRFX] TS_FRAME_ACKNOWLEDGE_PDU"))
{
return 1;
}
in_uint32_le(s, frame_id);
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPRFX] TS_FRAME_ACKNOWLEDGE_PDU "
"frameID %d", frame_id);
if (self->session->callback != 0)
{
/* call to xrdp_wm.c : callback */
self->session->callback(self->session->id, 0x5557, frame_id, 0,
0, 0);
}
else
{
LOG_DEVEL(LOG_LEVEL_WARNING,
"Bug: no callback registered for xrdp_rdp_process_frame_ack");
}
return 0;
}
/*****************************************************************************/
void
xrdp_rdp_suppress_output(struct xrdp_rdp *self, int suppress,
enum suppress_output_reason reason,
int left, int top, int right, int bottom)
{
int old_suppress = self->client_info.suppress_output_mask != 0;
if (suppress)
{
self->client_info.suppress_output_mask |= (unsigned int)reason;
}
else
{
self->client_info.suppress_output_mask &= ~(unsigned int)reason;
}
int current_suppress = self->client_info.suppress_output_mask != 0;
if (current_suppress != old_suppress && self->session->callback != 0)
{
self->session->callback(self->session->id, 0x5559, suppress,
MAKELONG(left, top),
MAKELONG(right, bottom), 0);
}
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_SUPPRESS_OUTPUT_PDU message */
static int
xrdp_rdp_process_suppress(struct xrdp_rdp *self, struct stream *s)
{
int rv = 1;
int allowDisplayUpdates;
int left;
int top;
int right;
int bottom;
if (s_check_rem_and_log(s, 1, "Parsing [MS-RDPBCGR] TS_SUPPRESS_OUTPUT_PDU"))
{
in_uint8(s, allowDisplayUpdates);
LOG_DEVEL(LOG_LEVEL_TRACE,
"Received [MS-RDPBCGR] TS_SUPPRESS_OUTPUT_PDU "
"allowDisplayUpdates %d", allowDisplayUpdates);
switch (allowDisplayUpdates)
{
case 0: /* SUPPRESS_DISPLAY_UPDATES */
LOG_DEVEL(LOG_LEVEL_DEBUG,
"Client requested display output to be suppressed");
xrdp_rdp_suppress_output(self, 1,
XSO_REASON_CLIENT_REQUEST,
0, 0, 0, 0);
rv = 0;
break;
case 1: /* ALLOW_DISPLAY_UPDATES */
LOG_DEVEL(LOG_LEVEL_DEBUG,
"Client requested display output to be enabled");
if (s_check_rem_and_log(s, 11,
"Parsing [MS-RDPBCGR] Padding and TS_RECTANGLE16"))
{
in_uint8s(s, 3); /* pad */
in_uint16_le(s, left);
in_uint16_le(s, top);
in_uint16_le(s, right);
in_uint16_le(s, bottom);
LOG_DEVEL(LOG_LEVEL_TRACE,
"Received [MS-RDPBCGR] TS_RECTANGLE16 "
"left %d, top %d, right %d, bottom %d",
left, top, right, bottom);
xrdp_rdp_suppress_output(self, 0,
XSO_REASON_CLIENT_REQUEST,
left, top, right, bottom);
rv = 0;
}
break;
}
}
return rv;
}
/*****************************************************************************/
/* Process a [MS-RDPBCGR] TS_SHAREDATAHEADER message based on it's pduType2 */
int
xrdp_rdp_process_data(struct xrdp_rdp *self, struct stream *s)
{
int uncompressedLength;
int pduType2;
int compressedType;
int compressedLength;
if (!s_check_rem_and_log(s, 12, "Parsing [MS-RDPBCGR] TS_SHAREDATAHEADER"))
{
return 1;
}
in_uint8s(s, 6); /* shareID (4 bytes), padding (1 byte), streamID (1 byte) */
in_uint16_le(s, uncompressedLength); /* shareID */
in_uint8(s, pduType2);
in_uint8(s, compressedType);
in_uint16_le(s, compressedLength);
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_SHAREDATAHEADER "
"shareID (ignored), streamID (ignored), uncompressedLength %d, "
"pduType2 0x%2.2x, compressedType 0x%2.2x, compressedLength %d",
uncompressedLength, pduType2, compressedType, compressedLength);
if (compressedType != 0)
{
/* don't support compression */
/* PACKET_COMPR_TYPE_8K = 0x00 */
LOG(LOG_LEVEL_ERROR, "Only RDP 4.0 bulk compression "
"(PACKET_COMPR_TYPE_8K) is supported by XRDP");
return 1;
}
if (compressedLength > uncompressedLength)
{
LOG(LOG_LEVEL_ERROR, "The compressed length %d is larger than "
"the uncompressed length %d, failing the processing of this "
"PDU", compressedLength, uncompressedLength);
return 1;
}
switch (pduType2)
{
case RDP_DATA_PDU_POINTER: /* 27(0x1b) */
xrdp_rdp_process_data_pointer(self, s);
break;
case RDP_DATA_PDU_INPUT: /* 28(0x1c) */
xrdp_rdp_process_data_input(self, s);
break;
case RDP_DATA_PDU_CONTROL: /* 20(0x14) */
xrdp_rdp_process_data_control(self, s);
break;
case RDP_DATA_PDU_SYNCHRONISE: /* 31(0x1f) */
xrdp_rdp_process_data_sync(self);
break;
case PDUTYPE2_REFRESH_RECT:
xrdp_rdp_process_screen_update(self, s);
break;
case PDUTYPE2_SUPPRESS_OUTPUT: /* 35(0x23) */
xrdp_rdp_process_suppress(self, s);
break;
case PDUTYPE2_SHUTDOWN_REQUEST: /* 36(0x24) ?? disconnect query? */
/* when this message comes, send a 37 back so the client */
/* is sure the connection is alive and it can ask if user */
/* really wants to disconnect */
LOG_DEVEL(LOG_LEVEL_TRACE, "Received [MS-RDPBCGR] TS_SHUTDOWN_REQ_PDU");
xrdp_rdp_send_disconnect_query_response(self); /* send a 37 back */
break;
case RDP_DATA_PDU_FONT2: /* 39(0x27) */
xrdp_rdp_process_data_font(self, s);
break;
case 56: /* PDUTYPE2_FRAME_ACKNOWLEDGE 0x38 */
xrdp_rdp_process_frame_ack(self, s);
break;
default:
LOG(LOG_LEVEL_WARNING,
"Received unknown [MS-RDPBCGR] TS_SHAREDATAHEADER pduType2 %d (ignoring)",
pduType2);
break;
}
return 0;
}
/*****************************************************************************/
int
xrdp_rdp_disconnect(struct xrdp_rdp *self)
{
return xrdp_sec_disconnect(self->sec_layer);
}
/*****************************************************************************/
int
xrdp_rdp_send_deactivate(struct xrdp_rdp *self)
{
struct stream *s;
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init(self, s) != 0)
{
free_stream(s);
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_deactivate: xrdp_rdp_init failed");
return 1;
}
/* TODO: why are all the fields missing from the TS_DEACTIVATE_ALL_PDU? */
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_DEACTIVATE_ALL_PDU "
"shareID <not set>, lengthSourceDescriptor <not set>, "
"sourceDescriptor <not set>");
if (xrdp_rdp_send(self, s, PDUTYPE_DEACTIVATEALLPDU) != 0)
{
free_stream(s);
LOG(LOG_LEVEL_ERROR, "Sending [MS-RDPBCGR] TS_DEACTIVATE_ALL_PDU failed");
return 1;
}
free_stream(s);
return 0;
}
/*****************************************************************************/
/** Send a [MS-RDPBCGR] TS_SAVE_SESSION_INFO_PDU_DATA message.
*
* @param self
* @param data the data to send to the client in the
* TS_SAVE_SESSION_INFO_PDU_DATA message. The first 4 bytes of the data
* buffer MUST by the infoType value as specified in MS-RDPBCGR 2.2.10.1.1
* @param data_bytes the length of the data buffer
* @returns error code
*/
int
xrdp_rdp_send_session_info(struct xrdp_rdp *self, const char *data,
int data_bytes)
{
struct stream *s;
if (data == NULL)
{
LOG(LOG_LEVEL_ERROR, "data must not be null");
return 1;
}
if (data_bytes < 4)
{
LOG(LOG_LEVEL_ERROR, "data_bytes must greater than or equal to 4");
return 1;
}
make_stream(s);
init_stream(s, 8192);
if (xrdp_rdp_init_data(self, s) != 0)
{
LOG(LOG_LEVEL_ERROR, "xrdp_rdp_send_session_info: xrdp_rdp_init_data failed");
free_stream(s);
return 1;
}
if (!s_check_rem_out_and_log(s, data_bytes, "Sending [MS-RDPBCGR] TS_SAVE_SESSION_INFO_PDU_DATA"))
{
free_stream(s);
return 1;
}
out_uint8a(s, data, data_bytes);
s_mark_end(s);
LOG_DEVEL(LOG_LEVEL_TRACE, "Sending [MS-RDPBCGR] TS_SAVE_SESSION_INFO_PDU_DATA "
"infoType 0x%8.8x, infoData <omitted from log>",
*((unsigned int *) data));
if (xrdp_rdp_send_data(self, s, RDP_DATA_PDU_LOGON) != 0)
{
LOG(LOG_LEVEL_ERROR, "Sending [MS-RDPBCGR] TS_SAVE_SESSION_INFO_PDU_DATA failed");
free_stream(s);
return 1;
}
free_stream(s);
return 0;
}
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