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xrdp/sesman/libsesman/sesman_config.c

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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2013
*
* 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 config.c
* @brief User authentication code
* @author Simone Fedele @< simo [at] esseemme [dot] org @>
*
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "arch.h"
#include "sesman_config.h"
#include "sesman_clip_restrict.h"
#include "list.h"
#include "file.h"
#include "log.h"
#include "os_calls.h"
#include "string_calls.h"
//#include "chansrv/chansrv_common.h"
#include "scp.h"
#define SESMAN_CFG_GLOBALS "Globals"
#define SESMAN_CFG_DEFWM "DefaultWindowManager"
#define SESMAN_CFG_ADDRESS "ListenAddress"
#define SESMAN_CFG_PORT "ListenPort"
#define SESMAN_CFG_ENABLE_USERWM "EnableUserWindowManager"
#define SESMAN_CFG_USERWM "UserWindowManager"
#define SESMAN_CFG_AUTH_FILE_PATH "AuthFilePath"
#define SESMAN_CFG_RECONNECT_SH "ReconnectScript"
#define SESMAN_CFG_XORG_PARAMS "Xorg"
#define SESMAN_CFG_VNC_PARAMS "Xvnc"
#define SESMAN_CFG_SESSION_VARIABLES "SessionVariables"
/*
#define SESMAN_CFG_LOGGING "Logging"
#define SESMAN_CFG_LOG_FILE "LogFile"
#define SESMAN_CFG_LOG_LEVEL "LogLevel"
#define SESMAN_CFG_LOG_ENABLE_SYSLOG "EnableSyslog"
#define SESMAN_CFG_LOG_SYSLOG_LEVEL "SyslogLevel"
*/
#define SESMAN_CFG_SECURITY "Security"
#define SESMAN_CFG_SEC_LOGIN_RETRY "MaxLoginRetry"
#define SESMAN_CFG_SEC_ALLOW_ROOT "AllowRootLogin"
#define SESMAN_CFG_SEC_USR_GROUP "TerminalServerUsers"
#define SESMAN_CFG_SEC_ADM_GROUP "TerminalServerAdmins"
#define SESMAN_CFG_SEC_ALWAYSGROUPCHECK "AlwaysGroupCheck"
#define SESMAN_CFG_SEC_RESTRICT_OUTBOUND_CLIPBOARD "RestrictOutboundClipboard"
#define SESMAN_CFG_SEC_RESTRICT_INBOUND_CLIPBOARD "RestrictInboundClipboard"
#define SESMAN_CFG_SEC_ALLOW_ALTERNATE_SHELL "AllowAlternateShell"
#define SESMAN_CFG_SEC_XORG_NO_NEW_PRIVILEGES "XorgNoNewPrivileges"
#define SESMAN_CFG_SEC_SESSION_SOCKDIR_GROUP "SessionSockdirGroup"
#define SESMAN_CFG_SESSIONS "Sessions"
#define SESMAN_CFG_SESS_MAX "MaxSessions"
#define SESMAN_CFG_SESS_KILL_DISC "KillDisconnected"
#define SESMAN_CFG_SESS_IDLE_LIMIT "IdleTimeLimit"
#define SESMAN_CFG_SESS_DISC_LIMIT "DisconnectedTimeLimit"
#define SESMAN_CFG_SESS_X11DISPLAYOFFSET "X11DisplayOffset"
#define SESMAN_CFG_SESS_MAX_DISPLAY "MaxDisplayNumber"
#define SESMAN_CFG_SESS_POLICY_S "Policy"
#define SESMAN_CFG_SESS_POLICY_DFLT_S "Default"
#define SESMAN_CFG_SESS_POLICY_SEP_S "Separate"
static const struct bitmask_char policy_bits[] =
{
{ SESMAN_CFG_SESS_POLICY_U, 'U' },
{ SESMAN_CFG_SESS_POLICY_B, 'B' },
{ SESMAN_CFG_SESS_POLICY_D, 'D' },
{ SESMAN_CFG_SESS_POLICY_I, 'I' },
BITMASK_CHAR_END_OF_LIST
};
/***************************************************************************//**
* Parse a session allocation policy string
*/
static unsigned int
parse_policy_string(const char *value)
{
unsigned int rv;
char unrecognised[16];
if (0 == g_strcasecmp(value, SESMAN_CFG_SESS_POLICY_DFLT_S))
{
rv = SESMAN_CFG_SESS_POLICY_DEFAULT;
}
else if (0 == g_strcasecmp(value, SESMAN_CFG_SESS_POLICY_SEP_S))
{
rv = SESMAN_CFG_SESS_POLICY_SEPARATE;
}
else
{
unrecognised[0] = '\0';
rv = g_charstr_to_bitmask(value, policy_bits, unrecognised,
sizeof(unrecognised));
if (unrecognised[0] != '\0')
{
LOG(LOG_LEVEL_WARNING, "Character(s) '%s' in the session"
" allocation policy are not recognised", unrecognised);
if (g_strchr(unrecognised, 'C') != NULL ||
g_strchr(unrecognised, 'c') != NULL)
{
/* Change from xrdp v0.9.x */
LOG(LOG_LEVEL_WARNING, "Character 'C' is no longer used"
" in session allocation policies - use '%s'",
SESMAN_CFG_SESS_POLICY_SEP_S);
}
}
}
return rv;
}
/******************************************************************************/
int
config_output_policy_string(unsigned int value,
char *buff, unsigned int bufflen)
{
int rv = 0;
if (bufflen > 0)
{
if (value & SESMAN_CFG_SESS_POLICY_DEFAULT)
{
rv = g_snprintf(buff, bufflen, "Default");
}
else if (value & SESMAN_CFG_SESS_POLICY_SEPARATE)
{
rv = g_snprintf(buff, bufflen, "Separate");
}
else
{
rv = g_bitmask_to_charstr(value, policy_bits, buff, bufflen, NULL);
}
}
return rv;
}
/***************************************************************************//**
*
* @brief Reads sesman [global] configuration section
* @param file configuration file descriptor
* @param cf pointer to a config struct
* @param param_n parameter name list
* @param param_v parameter value list
* @return 0 on success, 1 on failure
*
*/
static int
config_read_globals(int file, struct config_sesman *cf, struct list *param_n,
struct list *param_v)
{
int i;
list_clear(param_v);
list_clear(param_n);
/* resetting the struct */
cf->listen_port[0] = '\0';
cf->enable_user_wm = 0;
cf->user_wm = g_strdup("");
cf->default_wm = 0;
cf->auth_file_path = 0;
cf->reconnect_sh = 0;
file_read_section(file, SESMAN_CFG_GLOBALS, param_n, param_v);
for (i = 0; i < param_n->count; i++)
{
const char *param = (const char *)list_get_item(param_n, i);
const char *val = (const char *)list_get_item(param_v, i);
if (0 == g_strcasecmp(param, SESMAN_CFG_DEFWM))
{
cf->default_wm = g_strdup(val);
}
else if (0 == g_strcasecmp(param, SESMAN_CFG_USERWM))
{
g_free(cf->user_wm);
cf->user_wm = g_strdup(val);
}
else if (0 == g_strcasecmp(param, SESMAN_CFG_ENABLE_USERWM))
{
cf->enable_user_wm = g_text2bool(val);
}
else if (0 == g_strcasecmp(param, SESMAN_CFG_PORT))
{
scp_port_to_unix_domain_path(val, cf->listen_port,
sizeof(cf->listen_port));
}
else if (0 == g_strcasecmp(param, SESMAN_CFG_AUTH_FILE_PATH))
{
cf->auth_file_path = g_strdup(val);
}
else if (g_strcasecmp(param, SESMAN_CFG_RECONNECT_SH) == 0)
{
cf->reconnect_sh = g_strdup(val);
}
else if (0 == g_strcasecmp(param, SESMAN_CFG_ADDRESS))
{
/* Config must be updated for Unix Domain Sockets */
LOG(LOG_LEVEL_WARNING, "Obsolete setting' " SESMAN_CFG_ADDRESS
"' in [" SESMAN_CFG_GLOBALS "] should be removed.");
LOG(LOG_LEVEL_WARNING, "Review setting' " SESMAN_CFG_PORT "' in ["
SESMAN_CFG_GLOBALS "]");
}
}
/* checking for missing required parameters */
if ('\0' == cf->listen_port[0])
{
/* Load the default value */
scp_port_to_unix_domain_path(NULL, cf->listen_port,
sizeof(cf->listen_port));
}
if ('\0' == cf->user_wm[0])
{
cf->enable_user_wm = 0;
}
if (cf->default_wm == 0 || cf->default_wm[0] == '\0')
{
g_free(cf->default_wm);
cf->default_wm = g_strdup("startwm.sh");
}
/* if default_wm doesn't begin with '/', it's a relative path to
* XRDP_CFG_PATH */
if (cf->default_wm[0] != '/')
{
/* sizeof operator returns string length including null terminator */
int length = (sizeof(XRDP_CFG_PATH) +
g_strlen(cf->default_wm) + 1); /* '/' */
char *buf = (char *)g_malloc(length, 0);
g_sprintf(buf, "%s/%s", XRDP_CFG_PATH, cf->default_wm);
g_free(cf->default_wm);
cf->default_wm = buf;
}
if (cf->reconnect_sh == 0 || cf->reconnect_sh[0] == '\0')
{
g_free(cf->reconnect_sh);
cf->reconnect_sh = g_strdup("reconnectwm.sh");
}
/* if reconnect_sh doesn't begin with '/', it's a relative path to
* XRDP_CFG_PATH */
if (cf->reconnect_sh[0] != '/')
{
/* sizeof operator returns string length including null terminator */
int length = (sizeof(XRDP_CFG_PATH) +
g_strlen(cf->reconnect_sh) + 1); /* '/' */
char *buf = (char *)g_malloc(length, 0);
g_sprintf(buf, "%s/%s", XRDP_CFG_PATH, cf->reconnect_sh);
g_free(cf->reconnect_sh);
cf->reconnect_sh = buf;
}
return 0;
}
/***************************************************************************//**
*
* @brief Reads sesman [Security] configuration section
* @param file configuration file descriptor
* @param sc pointer to a config_security struct
* @param param_n parameter name list
* @param param_v parameter value list
* @return 0 on success, 1 on failure
*
*/
static int
config_read_security(int file, struct config_security *sc,
struct list *param_n,
struct list *param_v)
{
int i;
const char *buf;
const char *value;
list_clear(param_v);
list_clear(param_n);
/* setting defaults */
sc->allow_root = 0;
sc->login_retry = 3;
sc->restrict_outbound_clipboard = 0;
sc->restrict_inbound_clipboard = 0;
sc->allow_alternate_shell = 1;
sc->xorg_no_new_privileges = 1;
sc->ts_users = g_strdup("");
sc->ts_admins = g_strdup("");
sc->session_sockdir_group = g_strdup("");
file_read_section(file, SESMAN_CFG_SECURITY, param_n, param_v);
for (i = 0; i < param_n->count; i++)
{
buf = (const char *)list_get_item(param_n, i);
value = (const char *)list_get_item(param_v, i);
if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_ALLOW_ROOT))
{
sc->allow_root = g_text2bool(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_LOGIN_RETRY))
{
sc->login_retry = g_atoi(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_USR_GROUP))
{
g_free(sc->ts_users);
sc->ts_users = g_strdup(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_ADM_GROUP))
{
g_free(sc->ts_admins);
sc->ts_admins = g_strdup(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_ALWAYSGROUPCHECK))
{
sc->ts_always_group_check = g_text2bool(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_RESTRICT_OUTBOUND_CLIPBOARD))
{
char unrecognised[256];
sc->restrict_outbound_clipboard =
sesman_clip_restrict_string_to_bitmask(
(const char *)list_get_item(param_v, i),
unrecognised, sizeof(unrecognised));
if (unrecognised[0] != '\0')
{
LOG(LOG_LEVEL_WARNING,
"Unrecognised tokens parsing 'RestrictOutboundClipboard' %s",
unrecognised);
}
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_RESTRICT_INBOUND_CLIPBOARD))
{
char unrecognised[256];
sc->restrict_inbound_clipboard =
sesman_clip_restrict_string_to_bitmask(
(const char *)list_get_item(param_v, i),
unrecognised, sizeof(unrecognised));
if (unrecognised[0] != '\0')
{
LOG(LOG_LEVEL_WARNING,
"Unrecognised tokens parsing 'RestrictInboundClipboard' %s",
unrecognised);
}
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_ALLOW_ALTERNATE_SHELL))
{
sc->allow_alternate_shell =
g_text2bool(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_XORG_NO_NEW_PRIVILEGES))
{
sc->xorg_no_new_privileges =
g_text2bool(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SEC_SESSION_SOCKDIR_GROUP))
{
g_free(sc->session_sockdir_group);
sc->session_sockdir_group = g_strdup(value);
}
}
return 0;
}
/***************************************************************************//**
*
* @brief Reads sesman [Sessions] configuration section
* @param file configuration file descriptor
* @param ss pointer to a config_sessions struct
* @param param_n parameter name list
* @param param_v parameter value list
* @return 0 on success, 1 on failure
*
*/
static int
config_read_sessions(int file, struct config_sessions *se, struct list *param_n,
struct list *param_v)
{
int i;
const char *buf;
const char *value;
list_clear(param_v);
list_clear(param_n);
/* setting defaults */
se->x11_display_offset = 10;
// https://www.iana.org/assignments/service-names-port-numbers/service-names-port-numbers.xhtml`
se->max_display_number = 63;
se->max_sessions = 0;
se->max_idle_time = 0;
se->max_disc_time = 0;
se->kill_disconnected = 0;
se->policy = SESMAN_CFG_SESS_POLICY_DEFAULT;
file_read_section(file, SESMAN_CFG_SESSIONS, param_n, param_v);
for (i = 0; i < param_n->count; i++)
{
buf = (const char *)list_get_item(param_n, i);
value = (const char *)list_get_item(param_v, i);
if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_X11DISPLAYOFFSET))
{
int x11off = g_atoi(value);
if (x11off >= 0)
{
se->x11_display_offset = x11off;
}
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_MAX_DISPLAY))
{
int mdn = g_atoi(value);
if (mdn > 0)
{
se->max_display_number = mdn;
}
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_MAX))
{
int sm = g_atoi(value);
if (sm >= 0)
{
se->max_sessions = sm;
}
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_KILL_DISC))
{
se->kill_disconnected = g_text2bool(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_IDLE_LIMIT))
{
se->max_idle_time = g_atoi(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_DISC_LIMIT))
{
se->max_disc_time = g_atoi(value);
}
else if (0 == g_strcasecmp(buf, SESMAN_CFG_SESS_POLICY_S))
{
se->policy = parse_policy_string(value);
}
}
return 0;
}
/***************************************************************************//**
*
* @brief Reads sesman [Xorg] configuration section
* @param file configuration file descriptor
* @param cs pointer to a config_sesman struct
* @param param_n parameter name list
* @param param_v parameter value list
* @return 0 on success, 1 on failure
*
*/
static int
config_read_xorg_params(int file, struct config_sesman *cs,
struct list *param_n, struct list *param_v)
{
int i;
list_clear(param_v);
list_clear(param_n);
cs->xorg_params = list_create();
cs->xorg_params->auto_free = 1;
file_read_section(file, SESMAN_CFG_XORG_PARAMS, param_n, param_v);
for (i = 0; i < param_n->count; i++)
{
list_add_strdup(cs->xorg_params,
(const char *) list_get_item(param_v, i));
}
return 0;
}
/***************************************************************************//**
*
* @brief Reads sesman [Xvnc] configuration section
* @param file configuration file descriptor
* @param cs pointer to a config_sesman struct
* @param param_n parameter name list
* @param param_v parameter value list
* @return 0 on success, 1 on failure
*
*/
static int
config_read_vnc_params(int file, struct config_sesman *cs, struct list *param_n,
struct list *param_v)
{
int i;
list_clear(param_v);
list_clear(param_n);
cs->vnc_params = list_create();
cs->vnc_params->auto_free = 1;
file_read_section(file, SESMAN_CFG_VNC_PARAMS, param_n, param_v);
for (i = 0; i < param_n->count; i++)
{
list_add_strdup(cs->vnc_params,
(const char *)list_get_item(param_v, i));
}
return 0;
}
/******************************************************************************/
static int
config_read_session_variables(int file, struct config_sesman *cs,
struct list *param_n, struct list *param_v)
{
int i;
list_clear(param_v);
list_clear(param_n);
cs->env_names = list_create();
cs->env_names->auto_free = 1;
cs->env_values = list_create();
cs->env_values->auto_free = 1;
file_read_section(file, SESMAN_CFG_SESSION_VARIABLES, param_n, param_v);
for (i = 0; i < param_n->count; i++)
{
list_add_strdup(cs->env_names,
(const char *) list_get_item(param_n, i));
list_add_strdup(cs->env_values,
(const char *) list_get_item(param_v, i));
}
return 0;
}
/******************************************************************************/
struct config_sesman *
config_read(const char *sesman_ini)
{
struct config_sesman *cfg;
int all_ok = 0;
if ((cfg = g_new0(struct config_sesman, 1)) != NULL)
{
if ((cfg->sesman_ini = g_strdup(sesman_ini)) != NULL)
{
int fd;
if ((fd = g_file_open_ro(cfg->sesman_ini)) != -1)
{
struct list *sec;
struct list *param_n;
struct list *param_v;
sec = list_create();
sec->auto_free = 1;
file_read_sections(fd, sec);
param_n = list_create();
param_n->auto_free = 1;
param_v = list_create();
param_v->auto_free = 1;
all_ok = 1;
/* read global config */
config_read_globals(fd, cfg, param_n, param_v);
/* read Xvnc/Xorg parameter list */
config_read_vnc_params(fd, cfg, param_n, param_v);
config_read_xorg_params(fd, cfg, param_n, param_v);
/* read security config */
config_read_security(fd, &(cfg->sec), param_n, param_v);
/* read session config */
config_read_sessions(fd, &(cfg->sess), param_n, param_v);
config_read_session_variables(fd, cfg, param_n, param_v);
/* cleanup */
list_delete(sec);
list_delete(param_v);
list_delete(param_n);
g_file_close(fd);
}
}
}
if (!all_ok)
{
config_free(cfg);
cfg = NULL;
}
return cfg;
}
/******************************************************************************/
void
config_dump(struct config_sesman *config)
{
int i;
struct config_sessions *se;
struct config_security *sc;
se = &(config->sess);
sc = &(config->sec);
char policy_s[64];
char restrict_s[64];
/* Global sesman configuration */
g_writeln("Filename: %s", config->sesman_ini);
g_writeln("Global configuration:");
g_writeln(" ListenPort: %s", config->listen_port);
g_writeln(" EnableUserWindowManager: %d", config->enable_user_wm);
g_writeln(" UserWindowManager: %s", config->user_wm);
g_writeln(" DefaultWindowManager: %s", config->default_wm);
g_writeln(" ReconnectScript: %s", config->reconnect_sh);
g_writeln(" AuthFilePath: %s",
(config->auth_file_path ? config->auth_file_path : "disabled"));
/* Session configuration */
config_output_policy_string(se->policy, policy_s, sizeof(policy_s));
g_writeln("Session configuration:");
g_writeln(" MaxSessions: %d", se->max_sessions);
g_writeln(" X11DisplayOffset: %d", se->x11_display_offset);
g_writeln(" KillDisconnected: %d", se->kill_disconnected);
g_writeln(" IdleTimeLimit: %d", se->max_idle_time);
g_writeln(" DisconnectedTimeLimit: %d", se->max_disc_time);
g_writeln(" Policy: %s", policy_s);
/* Security configuration */
g_writeln("Security configuration:");
g_writeln(" AllowRootLogin: %d", sc->allow_root);
g_writeln(" MaxLoginRetry: %d", sc->login_retry);
g_writeln(" AlwaysGroupCheck: %d", sc->ts_always_group_check);
g_writeln(" AllowAlternateShell: %d", sc->allow_alternate_shell);
#ifdef HAVE_SYS_PRCTL_H
g_writeln(" XorgNoNewPrivileges: %d", sc->xorg_no_new_privileges);
#endif
sesman_clip_restrict_mask_to_string(sc->restrict_outbound_clipboard,
restrict_s, sizeof(restrict_s));
g_writeln(" RestrictOutboundClipboard: %s", restrict_s);
sesman_clip_restrict_mask_to_string(sc->restrict_inbound_clipboard,
restrict_s, sizeof(restrict_s));
g_writeln(" RestrictInboundClipboard: %s", restrict_s);
g_writeln(" TSUsersGroup: %s", sc->ts_users);
g_writeln(" TSAdminsGroup: %s", sc->ts_admins);
g_writeln(" SessionSockdirGroup: %s", sc->session_sockdir_group);
/* Xorg */
if (config->xorg_params->count)
{
g_writeln("Xorg parameters:");
}
for (i = 0; i < config->xorg_params->count; i++)
{
g_writeln(" Parameter %02d %s",
i, (char *) list_get_item(config->xorg_params, i));
}
/* Xvnc */
if (config->vnc_params->count)
{
g_writeln("Xvnc parameters:");
}
for (i = 0; i < config->vnc_params->count; i++)
{
g_writeln(" Parameter %02d %s",
i, (char *)list_get_item(config->vnc_params, i));
}
/* SessionVariables */
if (config->env_names->count)
{
g_writeln("%s parameters:", SESMAN_CFG_SESSION_VARIABLES);
}
for (i = 0; i < config->env_names->count; i++)
{
g_writeln(" Parameter %02d %s=%s",
i, (char *) list_get_item(config->env_names, i),
(char *) list_get_item(config->env_values, i));
}
}
/******************************************************************************/
void
config_free(struct config_sesman *cs)
{
if (cs != NULL)
{
g_free(cs->sesman_ini);
g_free(cs->default_wm);
g_free(cs->user_wm);
g_free(cs->reconnect_sh);
g_free(cs->auth_file_path);
list_delete(cs->vnc_params);
list_delete(cs->xorg_params);
list_delete(cs->env_names);
list_delete(cs->env_values);
g_free(cs->sec.ts_users);
g_free(cs->sec.ts_admins);
g_free(cs->sec.session_sockdir_group);
g_free(cs);
}
}
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