xrdp/libipm/eicp.c

325 lines
8.5 KiB
C

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2022, all xrdp contributors
*
* 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.
*/
/**
*
* @file libipm/eicp.c
* @brief EICP definitions
* @author Matt Burt
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "eicp.h"
#include "libipm.h"
#include "guid.h"
#include "os_calls.h"
#include "trans.h"
/*****************************************************************************/
static const char *
msgno_to_str(unsigned short n)
{
return
(n == E_EICP_SYS_LOGIN_REQUEST) ? "EICP_SYS_LOGIN_REQUEST" :
(n == E_EICP_SYS_LOGIN_RESPONSE) ? "EICP_SYS_LOGIN_RESPONSE" :
(n == E_EICP_LOGOUT_REQUEST) ? "EICP_LOGOUT_REQUEST" :
(n == E_EICP_CREATE_SESSION_REQUEST) ? "EICP_CREATE_SESSION_REQUEST" :
NULL;
}
/*****************************************************************************/
const char *
eicp_msgno_to_str(enum eicp_msg_code n, char *buff, unsigned int buff_size)
{
const char *str = msgno_to_str((unsigned short)n);
if (str == NULL)
{
g_snprintf(buff, buff_size, "[code #%d]", (int)n);
}
else
{
g_snprintf(buff, buff_size, "%s", str);
}
return buff;
}
/*****************************************************************************/
int
eicp_init_trans(struct trans *trans)
{
return libipm_init_trans(trans, LIBIPM_FAC_EICP, msgno_to_str);
}
/*****************************************************************************/
struct trans *
eicp_init_trans_from_fd(int fd, int trans_type, int (*term_func)(void))
{
struct trans *result;
if ((result = trans_create(TRANS_MODE_UNIX, 128, 128)) == NULL)
{
LOG(LOG_LEVEL_ERROR, "Can't create ECP transport [%s]",
g_get_strerror());
}
else
{
result->sck = fd;
result->type1 = trans_type;
result->status = TRANS_STATUS_UP;
result->is_term = term_func;
// Make sure child processes don't inherit our FD
(void)g_file_set_cloexec(result->sck, 1);
if (eicp_init_trans(result) != 0)
{
LOG(LOG_LEVEL_ERROR, "eicp_init_trans() call failed");
trans_delete(result);
result = NULL;
}
}
return result;
}
/*****************************************************************************/
int
eicp_msg_in_check_available(struct trans *trans, int *available)
{
return libipm_msg_in_check_available(trans, available);
}
/*****************************************************************************/
int
eicp_msg_in_wait_available(struct trans *trans)
{
return libipm_msg_in_wait_available(trans);
}
/*****************************************************************************/
enum eicp_msg_code
eicp_msg_in_get_msgno(const struct trans *trans)
{
return (enum eicp_msg_code)libipm_msg_in_get_msgno(trans);
}
/*****************************************************************************/
void
eicp_msg_in_reset(struct trans *trans)
{
libipm_msg_in_reset(trans);
}
/*****************************************************************************/
int
eicp_send_sys_login_request(struct trans *trans,
const char *username,
const char *password,
const char *ip_addr,
int scp_fd)
{
int rv;
rv = libipm_msg_out_simple_send(
trans,
(int)E_EICP_SYS_LOGIN_REQUEST,
"sssh",
username,
password,
ip_addr,
scp_fd);
/* Wipe the output buffer to remove the password */
libipm_msg_out_erase(trans);
return rv;
}
/*****************************************************************************/
int
eicp_get_sys_login_request(struct trans *trans,
const char **username,
const char **password,
const char **ip_addr,
int *scp_fd)
{
/* Make sure the buffer is cleared after processing this message */
libipm_set_flags(trans, LIBIPM_E_MSG_IN_ERASE_AFTER_USE);
return libipm_msg_in_parse( trans, "sssh",
username, password, ip_addr, scp_fd);
}
/*****************************************************************************/
int
eicp_send_sys_login_response(struct trans *trans,
int is_logged_in,
uid_t uid,
int scp_fd)
{
int rv;
if (is_logged_in)
{
rv = libipm_msg_out_simple_send(
trans,
(int)E_EICP_SYS_LOGIN_RESPONSE,
"bih",
1,
uid,
scp_fd);
}
else
{
rv = libipm_msg_out_simple_send(
trans, (int)E_EICP_SYS_LOGIN_RESPONSE, "b", 0);
}
return rv;
}
/*****************************************************************************/
int
eicp_get_sys_login_response(struct trans *trans,
int *is_logged_in,
uid_t *uid,
int *scp_fd)
{
int rv;
if ((rv = libipm_msg_in_parse(trans, "b", is_logged_in)) == 0)
{
if (*is_logged_in)
{
int32_t i_uid;
rv = libipm_msg_in_parse(
trans,
"ih",
&i_uid,
scp_fd);
if (rv == 0)
{
*uid = (uid_t)i_uid;
}
}
else
{
*uid = (uid_t) -1;
*scp_fd = -1;
}
}
return rv;
}
/*****************************************************************************/
int
eicp_send_logout_request(struct trans *trans)
{
return libipm_msg_out_simple_send(trans, (int)E_EICP_LOGOUT_REQUEST, NULL);
}
/*****************************************************************************/
int
eicp_send_create_session_request(struct trans *trans,
int scp_fd,
unsigned int display,
enum scp_session_type type,
unsigned short width,
unsigned short height,
unsigned char bpp,
const char *shell,
const char *directory)
{
return libipm_msg_out_simple_send(
trans,
(int)E_EICP_CREATE_SESSION_REQUEST,
"huyqqyss",
scp_fd,
display,
type,
width,
height,
bpp,
shell,
directory);
}
/*****************************************************************************/
int
eicp_get_create_session_request(struct trans *trans,
int *scp_fd,
unsigned int *display,
enum scp_session_type *type,
unsigned short *width,
unsigned short *height,
unsigned char *bpp,
const char **shell,
const char **directory)
{
/* Intermediate values */
uint32_t i_display;
uint8_t i_type;
uint16_t i_width;
uint16_t i_height;
uint8_t i_bpp;
int rv = libipm_msg_in_parse(
trans,
"huyqqyss",
scp_fd,
&i_display,
&i_type,
&i_width,
&i_height,
&i_bpp,
shell,
directory);
if (rv == 0)
{
*display = i_display;
*type = (enum scp_session_type)i_type;
*width = i_width;
*height = i_height;
/* bpp is fixed for Xorg session types */
*bpp = (*type == SCP_SESSION_TYPE_XORG) ? 24 : i_bpp;
}
return rv;
}