772 lines
25 KiB
C
772 lines
25 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2015
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*
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* BSD process grouping by:
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland.
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* Copyright (c) 2000-2001 Markus Friedl.
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* Copyright (c) 2011-2015 Koichiro Iwao, Kyushu Institute of Technology.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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*
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* @file session.c
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* @brief Session management code
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* @author Jay Sorg, Simone Fedele
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*
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*/
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#if defined(HAVE_CONFIG_H)
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#include "config_ac.h"
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#endif
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#ifdef HAVE_SYS_PRCTL_H
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#include <sys/prctl.h>
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#endif
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#include "arch.h"
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#include "session.h"
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#include "auth.h"
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#include "config.h"
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#include "env.h"
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#include "guid.h"
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#include "list.h"
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#include "log.h"
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#include "os_calls.h"
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#include "sesman.h"
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#include "string_calls.h"
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#include "xauth.h"
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#include "xwait.h"
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#include "xrdp_sockets.h"
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#ifndef PR_SET_NO_NEW_PRIVS
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#define PR_SET_NO_NEW_PRIVS 38
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#endif
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/**
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* Creates a string consisting of all parameters that is hosted in the param list
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* @param self
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* @param outstr, allocate this buffer before you use this function
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* @param len the allocated len for outstr
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* @return
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*/
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char *
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dumpItemsToString(struct list *self, char *outstr, int len)
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{
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int index;
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int totalLen = 0;
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g_memset(outstr, 0, len);
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if (self->count == 0)
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{
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LOG_DEVEL(LOG_LEVEL_TRACE, "List is empty");
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}
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for (index = 0; index < self->count; index++)
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{
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/* +1 = one space*/
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totalLen = totalLen + g_strlen((char *)list_get_item(self, index)) + 1;
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if (len > totalLen)
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{
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g_strcat(outstr, (char *)list_get_item(self, index));
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g_strcat(outstr, " ");
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}
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}
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return outstr ;
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}
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/******************************************************************************/
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static int
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session_start_chansrv(int uid, int display)
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{
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struct list *chansrv_params;
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const char *exe_path = XRDP_SBIN_PATH "/xrdp-chansrv";
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int chansrv_pid;
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chansrv_pid = g_fork();
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if (chansrv_pid == 0)
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{
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chansrv_params = list_create();
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chansrv_params->auto_free = 1;
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/* building parameters */
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list_add_strdup(chansrv_params, exe_path);
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env_set_user(uid, 0, display,
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g_cfg->env_names,
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g_cfg->env_values);
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LOG(LOG_LEVEL_INFO,
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"Starting the xrdp channel server for display %d", display);
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/* executing chansrv */
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g_execvp_list(exe_path, chansrv_params);
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/* should not get here */
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list_delete(chansrv_params);
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g_exit(1);
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}
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return chansrv_pid;
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}
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/******************************************************************************/
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static int
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cleanup_sockets(int display)
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{
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LOG(LOG_LEVEL_INFO, "cleanup_sockets:");
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char file[256];
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int error;
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error = 0;
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g_snprintf(file, 255, CHANSRV_PORT_OUT_STR, display);
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if (g_file_exist(file))
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{
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LOG(LOG_LEVEL_DEBUG, "cleanup_sockets: deleting %s", file);
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if (g_file_delete(file) == 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"cleanup_sockets: failed to delete %s (%s)",
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file, g_get_strerror());
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error++;
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}
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}
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g_snprintf(file, 255, CHANSRV_PORT_IN_STR, display);
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if (g_file_exist(file))
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{
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LOG(LOG_LEVEL_DEBUG, "cleanup_sockets: deleting %s", file);
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if (g_file_delete(file) == 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"cleanup_sockets: failed to delete %s (%s)",
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file, g_get_strerror());
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error++;
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}
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}
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g_snprintf(file, 255, XRDP_CHANSRV_STR, display);
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if (g_file_exist(file))
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{
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LOG(LOG_LEVEL_DEBUG, "cleanup_sockets: deleting %s", file);
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if (g_file_delete(file) == 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"cleanup_sockets: failed to delete %s (%s)",
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file, g_get_strerror());
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error++;
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}
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}
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g_snprintf(file, 255, CHANSRV_API_STR, display);
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if (g_file_exist(file))
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{
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LOG(LOG_LEVEL_DEBUG, "cleanup_sockets: deleting %s", file);
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if (g_file_delete(file) == 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"cleanup_sockets: failed to delete %s (%s)",
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file, g_get_strerror());
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error++;
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}
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}
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/* the following files should be deleted by xorgxrdp
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* but just in case the deletion failed */
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g_snprintf(file, 255, XRDP_X11RDP_STR, display);
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if (g_file_exist(file))
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{
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LOG(LOG_LEVEL_DEBUG, "cleanup_sockets: deleting %s", file);
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if (g_file_delete(file) == 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"cleanup_sockets: failed to delete %s (%s)",
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file, g_get_strerror());
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error++;
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}
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}
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g_snprintf(file, 255, XRDP_DISCONNECT_STR, display);
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if (g_file_exist(file))
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{
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LOG(LOG_LEVEL_DEBUG, "cleanup_sockets: deleting %s", file);
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if (g_file_delete(file) == 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"cleanup_sockets: failed to delete %s (%s)",
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file, g_get_strerror());
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error++;
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}
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}
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return error;
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}
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/******************************************************************************/
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/**
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* Convert a UID to a username
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*
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* @param uid UID
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* @param uname pointer to output buffer
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* @param uname_len Length of output buffer
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* @return 0 for success.
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*/
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static int
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username_from_uid(int uid, char *uname, int uname_len)
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{
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char *ustr;
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int rv = g_getuser_info_by_uid(uid, &ustr, NULL, NULL, NULL, NULL);
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if (rv == 0)
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{
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g_snprintf(uname, uname_len, "%s", ustr);
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g_free(ustr);
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}
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else
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{
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g_snprintf(uname, uname_len, "<unknown>");
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}
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return rv;
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}
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/******************************************************************************/
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static void
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exit_status_to_str(const struct exit_status *e, char buff[], int bufflen)
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{
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switch (e->reason)
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{
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case E_XR_STATUS_CODE:
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if (e->val == 0)
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{
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g_snprintf(buff, bufflen, "exit code zero");
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}
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else
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{
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g_snprintf(buff, bufflen, "non-zero exit code %d", e->val);
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}
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break;
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case E_XR_SIGNAL:
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g_snprintf(buff, bufflen, "signal %d", e->val);
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break;
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default:
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g_snprintf(buff, bufflen, "an unexpected error");
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break;
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}
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}
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/******************************************************************************/
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void
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session_start(struct auth_info *auth_info,
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const struct session_parameters *s)
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{
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char geometry[32];
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char depth[32];
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char screen[32]; /* display number */
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char text[256];
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char username[256];
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char execvpparams[2048];
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char *xserver = NULL; /* absolute/relative path to Xorg/Xvnc */
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char *passwd_file = NULL;
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struct list *xserver_params = (struct list *)NULL;
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char authfile[256]; /* The filename for storing xauth information */
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int chansrv_pid;
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int display_pid;
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int window_manager_pid;
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/* initialize (zero out) local variables: */
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g_memset(geometry, 0, sizeof(char) * 32);
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g_memset(depth, 0, sizeof(char) * 32);
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g_memset(screen, 0, sizeof(char) * 32);
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g_memset(text, 0, sizeof(char) * 256);
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/* Get the username for display purposes */
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username_from_uid(s->uid, username, sizeof(username));
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LOG(LOG_LEVEL_INFO,
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"[session start] (display %d): calling auth_start_session from pid %d",
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s->display, g_getpid());
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/* Set the secondary groups before starting the session to prevent
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* problems on PAM-based systems (see Linux pam_setcred(3)).
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* If we have *BSD setusercontext() this is not done here */
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#ifndef HAVE_SETUSERCONTEXT
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if (g_initgroups(username) != 0)
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{
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LOG(LOG_LEVEL_ERROR,
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"Failed to initialise secondary groups for %s: %s",
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username, g_get_strerror());
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g_exit(1);
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}
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#endif
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auth_start_session(auth_info, s->display);
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g_sprintf(geometry, "%dx%d", s->width, s->height);
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g_sprintf(depth, "%d", s->bpp);
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g_sprintf(screen, ":%d", s->display);
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#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
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/*
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* FreeBSD bug
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* ports/157282: effective login name is not set by xrdp-sesman
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* http://www.freebsd.org/cgi/query-pr.cgi?pr=157282
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*
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* from:
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* $OpenBSD: session.c,v 1.252 2010/03/07 11:57:13 dtucker Exp $
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* with some ideas about BSD process grouping to xrdp
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*/
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pid_t bsdsespid = g_fork();
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if (bsdsespid == -1)
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{
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}
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else if (bsdsespid == 0) /* BSD session leader */
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{
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/**
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* Create a new session and process group since the 4.4BSD
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* setlogin() affects the entire process group
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*/
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if (g_setsid() < 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"[session start] (display %d): setsid failed - pid %d",
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s->display, g_getpid());
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}
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if (g_setlogin(username) < 0)
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{
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LOG(LOG_LEVEL_WARNING,
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"[session start] (display %d): setlogin failed for user %s - pid %d",
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s->display, username, g_getpid());
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}
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}
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g_waitpid(bsdsespid);
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if (bsdsespid > 0)
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{
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g_exit(0);
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/*
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* intermediate sesman should exit here after WM exits.
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* do not execute the following codes.
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*/
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}
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#endif
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window_manager_pid = g_fork(); /* parent becomes X,
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child forks wm, and waits, todo */
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if (window_manager_pid == -1)
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{
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LOG(LOG_LEVEL_ERROR,
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"Failed to fork for the window manager on display %d", s->display);
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}
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else if (window_manager_pid == 0)
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{
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enum xwait_status xws;
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env_set_user(s->uid,
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0,
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s->display,
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g_cfg->env_names,
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g_cfg->env_values);
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xws = wait_for_xserver(s->display);
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if (xws == XW_STATUS_OK)
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{
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auth_set_env(auth_info);
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if (s->directory != 0)
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{
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if (s->directory[0] != 0)
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{
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g_set_current_dir(s->directory);
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}
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}
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if (s->shell != 0 && s->shell[0] != 0)
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{
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if (g_strchr(s->shell, ' ') != 0 || g_strchr(s->shell, '\t') != 0)
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{
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LOG(LOG_LEVEL_INFO,
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"Starting user requested window manager on "
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"display %d with embedded arguments using a shell: %s",
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s->display, s->shell);
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const char *argv[] = {"sh", "-c", s->shell, NULL};
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g_execvp("/bin/sh", (char **)argv);
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}
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else
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{
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LOG(LOG_LEVEL_INFO,
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"Starting user requested window manager on "
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"display %d: %s", s->display, s->shell);
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g_execlp3(s->shell, s->shell, 0);
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}
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}
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else
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{
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LOG(LOG_LEVEL_DEBUG, "The user session on display %d did "
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"not request a specific window manager", s->display);
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}
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/* try to execute user window manager if enabled */
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if (g_cfg->enable_user_wm)
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{
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g_sprintf(text, "%s/%s", g_getenv("HOME"), g_cfg->user_wm);
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if (g_file_exist(text))
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{
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LOG(LOG_LEVEL_INFO,
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"Starting window manager on display %d"
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" from user home directory: %s", s->display, text);
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g_execlp3(text, g_cfg->user_wm, 0);
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}
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else
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{
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LOG(LOG_LEVEL_DEBUG,
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"The user home directory window manager configuration "
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"is enabled but window manager program does not exist: %s",
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text);
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}
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}
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LOG(LOG_LEVEL_INFO,
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"Starting the default window manager on display %d: %s",
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s->display, g_cfg->default_wm);
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g_execlp3(g_cfg->default_wm, g_cfg->default_wm, 0);
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/* still a problem starting window manager just start xterm */
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LOG(LOG_LEVEL_WARNING,
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"No window manager on display %d started, "
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"so falling back to starting xterm for user debugging",
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s->display);
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g_execlp3("xterm", "xterm", 0);
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/* should not get here */
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}
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else
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{
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switch (xws)
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{
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case XW_STATUS_TIMED_OUT:
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LOG(LOG_LEVEL_ERROR, "Timed out waiting for X server");
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break;
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case XW_STATUS_FAILED_TO_START:
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LOG(LOG_LEVEL_ERROR, "X server failed to start");
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break;
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default:
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LOG(LOG_LEVEL_ERROR,
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"An error occurred waiting for the X server");
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}
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}
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LOG(LOG_LEVEL_ERROR, "A fatal error has occurred attempting to start "
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"the window manager on display %d, aborting connection",
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s->display);
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g_exit(0);
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}
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else
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{
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display_pid = g_fork(); /* parent becomes scp,
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child becomes X */
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if (display_pid == -1)
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{
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LOG(LOG_LEVEL_ERROR,
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"Failed to fork for the X server on display %d", s->display);
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}
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else if (display_pid == 0) /* child */
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{
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if (s->type == SCP_SESSION_TYPE_XVNC)
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{
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env_set_user(s->uid,
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&passwd_file,
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s->display,
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g_cfg->env_names,
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g_cfg->env_values);
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}
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else
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{
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env_set_user(s->uid,
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0,
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s->display,
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g_cfg->env_names,
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g_cfg->env_values);
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}
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/* setting Xserver environment variables */
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g_snprintf(text, 255, "%d", g_cfg->sess.max_idle_time);
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g_setenv("XRDP_SESMAN_MAX_IDLE_TIME", text, 1);
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g_snprintf(text, 255, "%d", g_cfg->sess.max_disc_time);
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g_setenv("XRDP_SESMAN_MAX_DISC_TIME", text, 1);
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g_snprintf(text, 255, "%d", g_cfg->sess.kill_disconnected);
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g_setenv("XRDP_SESMAN_KILL_DISCONNECTED", text, 1);
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g_setenv("XRDP_SOCKET_PATH", XRDP_SOCKET_PATH, 1);
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/* prepare the Xauthority stuff */
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if (g_getenv("XAUTHORITY") != NULL)
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{
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g_snprintf(authfile, 255, "%s", g_getenv("XAUTHORITY"));
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}
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else
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{
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g_snprintf(authfile, 255, "%s", ".Xauthority");
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}
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/* Add the entry in XAUTHORITY file or exit if error */
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if (add_xauth_cookie(s->display, authfile) != 0)
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{
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LOG(LOG_LEVEL_ERROR,
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"Error setting the xauth cookie for display %d in file %s",
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s->display, authfile);
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LOG(LOG_LEVEL_ERROR, "A fatal error has occurred attempting to start "
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"the X server on display %d, aborting connection",
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s->display);
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g_exit(1);
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}
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if (s->type == SCP_SESSION_TYPE_XORG)
|
|
{
|
|
#ifdef HAVE_SYS_PRCTL_H
|
|
/*
|
|
* Make sure Xorg doesn't run setuid root. Root access is not
|
|
* needed. Xorg can fail when run as root and the user has no
|
|
* console permissions.
|
|
* PR_SET_NO_NEW_PRIVS requires Linux kernel 3.5 and newer.
|
|
*/
|
|
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) < 0)
|
|
{
|
|
LOG(LOG_LEVEL_WARNING,
|
|
"[session start] (display %d): Failed to disable "
|
|
"setuid on X server: %s",
|
|
s->display, g_get_strerror());
|
|
}
|
|
#endif
|
|
|
|
xserver_params = list_create();
|
|
xserver_params->auto_free = 1;
|
|
|
|
/* get path of Xorg from config */
|
|
xserver = g_strdup((const char *)list_get_item(g_cfg->xorg_params, 0));
|
|
|
|
/* these are the must have parameters */
|
|
list_add_strdup_multi(xserver_params,
|
|
xserver, screen,
|
|
"-auth", authfile,
|
|
NULL);
|
|
|
|
/* additional parameters from sesman.ini file */
|
|
list_append_list_strdup(g_cfg->xorg_params, xserver_params, 1);
|
|
|
|
/* some args are passed via env vars */
|
|
g_sprintf(geometry, "%d", s->width);
|
|
g_setenv("XRDP_START_WIDTH", geometry, 1);
|
|
|
|
g_sprintf(geometry, "%d", s->height);
|
|
g_setenv("XRDP_START_HEIGHT", geometry, 1);
|
|
}
|
|
else if (s->type == SCP_SESSION_TYPE_XVNC)
|
|
{
|
|
char guid_str[GUID_STR_SIZE];
|
|
guid_to_str(&s->guid, guid_str);
|
|
env_check_password_file(passwd_file, guid_str);
|
|
xserver_params = list_create();
|
|
xserver_params->auto_free = 1;
|
|
|
|
/* get path of Xvnc from config */
|
|
xserver = g_strdup((const char *)list_get_item(g_cfg->vnc_params, 0));
|
|
|
|
/* these are the must have parameters */
|
|
list_add_strdup_multi(xserver_params,
|
|
xserver, screen,
|
|
"-auth", authfile,
|
|
"-geometry", geometry,
|
|
"-depth", depth,
|
|
"-rfbauth", passwd_file,
|
|
NULL);
|
|
g_free(passwd_file);
|
|
|
|
/* additional parameters from sesman.ini file */
|
|
//config_read_xserver_params(SCP_SESSION_TYPE_XVNC,
|
|
// xserver_params);
|
|
list_append_list_strdup(g_cfg->vnc_params, xserver_params, 1);
|
|
}
|
|
else
|
|
{
|
|
LOG(LOG_LEVEL_ERROR, "Unknown session type: %d",
|
|
s->type);
|
|
LOG(LOG_LEVEL_ERROR, "A fatal error has occurred attempting "
|
|
"to start the X server on display %d, aborting connection",
|
|
s->display);
|
|
g_exit(1);
|
|
}
|
|
|
|
/* fire up X server */
|
|
LOG(LOG_LEVEL_INFO, "Starting X server on display %d: %s",
|
|
s->display, dumpItemsToString(xserver_params, execvpparams, 2048));
|
|
g_execvp_list(xserver, xserver_params);
|
|
|
|
/* should not get here */
|
|
LOG(LOG_LEVEL_ERROR,
|
|
"Error starting X server on display %d", s->display);
|
|
LOG(LOG_LEVEL_ERROR, "A fatal error has occurred attempting "
|
|
"to start the X server on display %d, aborting connection",
|
|
s->display);
|
|
|
|
list_delete(xserver_params);
|
|
g_exit(1);
|
|
}
|
|
else
|
|
{
|
|
int wm_wait_time;
|
|
struct exit_status wm_exit_status;
|
|
struct exit_status xserver_exit_status;
|
|
struct exit_status chansrv_exit_status;
|
|
char reason[128];
|
|
|
|
chansrv_pid = session_start_chansrv(s->uid, s->display);
|
|
|
|
LOG(LOG_LEVEL_INFO,
|
|
"Session started successfully for user %s on display %d",
|
|
username, s->display);
|
|
|
|
/* Monitor the amount of time we wait for the
|
|
* window manager. This is approximately how long the window
|
|
* manager was running for */
|
|
LOG(LOG_LEVEL_INFO, "Session in progress on display %d, waiting "
|
|
"until the window manager (pid %d) exits to end the session",
|
|
s->display, window_manager_pid);
|
|
wm_wait_time = g_time1();
|
|
wm_exit_status = g_waitpid_status(window_manager_pid);
|
|
wm_wait_time = g_time1() - wm_wait_time;
|
|
if (wm_exit_status.reason == E_XR_STATUS_CODE &&
|
|
wm_exit_status.val == 0)
|
|
{
|
|
// Normal exit
|
|
}
|
|
else
|
|
{
|
|
exit_status_to_str(&wm_exit_status, reason, sizeof(reason));
|
|
|
|
LOG(LOG_LEVEL_WARNING,
|
|
"Window manager (pid %d, display %d) "
|
|
"exited with %s. This "
|
|
"could indicate a window manager config problem",
|
|
window_manager_pid, s->display, reason);
|
|
}
|
|
if (wm_wait_time < 10)
|
|
{
|
|
/* This could be a config issue. Log a significant error */
|
|
LOG(LOG_LEVEL_WARNING, "Window manager (pid %d, display %d) "
|
|
"exited quickly (%d secs). This could indicate a window "
|
|
"manager config problem",
|
|
window_manager_pid, s->display, wm_wait_time);
|
|
}
|
|
else
|
|
{
|
|
LOG(LOG_LEVEL_DEBUG, "Window manager (pid %d, display %d) "
|
|
"was running for %d seconds.",
|
|
window_manager_pid, s->display, wm_wait_time);
|
|
}
|
|
LOG(LOG_LEVEL_INFO,
|
|
"Calling auth_stop_session from pid %d",
|
|
g_getpid());
|
|
auth_stop_session(auth_info);
|
|
// auth_end() is called from the main process currently,
|
|
// as this called auth_start()
|
|
//auth_end(auth_info);
|
|
|
|
LOG(LOG_LEVEL_INFO,
|
|
"Terminating X server (pid %d) on display %d",
|
|
display_pid, s->display);
|
|
g_sigterm(display_pid);
|
|
|
|
LOG(LOG_LEVEL_INFO, "Terminating the xrdp channel server (pid %d) "
|
|
"on display %d", chansrv_pid, s->display);
|
|
g_sigterm(chansrv_pid);
|
|
|
|
/* make sure socket cleanup happen after child process exit */
|
|
xserver_exit_status = g_waitpid_status(display_pid);
|
|
exit_status_to_str(&xserver_exit_status, reason, sizeof(reason));
|
|
LOG(LOG_LEVEL_INFO,
|
|
"X server on display %d (pid %d) exited with %s",
|
|
s->display, display_pid, reason);
|
|
|
|
chansrv_exit_status = g_waitpid_status(chansrv_pid);
|
|
exit_status_to_str(&chansrv_exit_status, reason, sizeof(reason));
|
|
LOG(LOG_LEVEL_INFO,
|
|
"xrdp channel server for display %d (pid %d)"
|
|
" exited with %s",
|
|
s->display, chansrv_pid, reason);
|
|
|
|
cleanup_sockets(s->display);
|
|
g_deinit();
|
|
g_exit(0);
|
|
}
|
|
}
|
|
}
|
|
|
|
/******************************************************************************/
|
|
int
|
|
session_reconnect(int display, int uid,
|
|
struct auth_info *auth_info)
|
|
{
|
|
int pid;
|
|
|
|
pid = g_fork();
|
|
|
|
if (pid == -1)
|
|
{
|
|
LOG(LOG_LEVEL_ERROR, "Failed to fork for session reconnection script");
|
|
}
|
|
else if (pid == 0)
|
|
{
|
|
env_set_user(uid,
|
|
0,
|
|
display,
|
|
g_cfg->env_names,
|
|
g_cfg->env_values);
|
|
auth_set_env(auth_info);
|
|
|
|
if (g_file_exist(g_cfg->reconnect_sh))
|
|
{
|
|
LOG(LOG_LEVEL_INFO,
|
|
"Starting session reconnection script on display %d: %s",
|
|
display, g_cfg->reconnect_sh);
|
|
g_execlp3(g_cfg->reconnect_sh, g_cfg->reconnect_sh, 0);
|
|
|
|
/* should not get here */
|
|
LOG(LOG_LEVEL_ERROR,
|
|
"Error starting session reconnection script on display %d: %s",
|
|
display, g_cfg->reconnect_sh);
|
|
}
|
|
else
|
|
{
|
|
LOG(LOG_LEVEL_WARNING,
|
|
"Session reconnection script file does not exist: %s",
|
|
g_cfg->reconnect_sh);
|
|
}
|
|
|
|
/* TODO: why is this existing with a success error code when the
|
|
reconnect script failed to be executed? */
|
|
g_exit(0);
|
|
}
|
|
|
|
return display;
|
|
}
|