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Rework sesman with new files

This commit is contained in:
matt335672 2023-04-24 15:32:00 +01:00
parent 3895954b75
commit 74cd7d1837
9 changed files with 615 additions and 832 deletions
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14
sesman/Makefile.am
View File

@ -16,8 +16,10 @@ sbin_PROGRAMS = \
xrdp-sesman xrdp-sesman
xrdp_sesman_SOURCES = \ xrdp_sesman_SOURCES = \
env.c \ eicp_process.c \
env.h \ eicp_process.h \
ercp_process.c \
ercp_process.h \
lock_uds.c \ lock_uds.c \
lock_uds.h \ lock_uds.h \
pre_session_list.c \ pre_session_list.c \
@ -28,16 +30,10 @@ xrdp_sesman_SOURCES = \
sesman.h \ sesman.h \
sesexec_control.c \ sesexec_control.c \
sesexec_control.h \ sesexec_control.h \
session.c \
session.h \
session_list.c \ session_list.c \
session_list.h \ session_list.h \
sig.c \ sig.c \
sig.h \ sig.h
xauth.c \
xauth.h \
xwait.c \
xwait.h
xrdp_sesman_LDADD = \ xrdp_sesman_LDADD = \
$(top_builddir)/sesman/libsesman/libsesman.la \ $(top_builddir)/sesman/libsesman/libsesman.la \

685
sesman/scp_process.c
View File

@ -30,168 +30,37 @@
#include "trans.h" #include "trans.h"
#include "os_calls.h" #include "os_calls.h"
#include "eicp.h"
#include "ercp.h"
#include "scp.h" #include "scp.h"
#include "sesman_config.h"
#include "scp_process.h" #include "scp_process.h"
#include "sesman.h"
#include "sesman_access.h" #include "sesman_access.h"
#include "sesman_auth.h" #include "sesman_auth.h"
#include "guid.h" #include "sesman_config.h"
#include "os_calls.h" #include "os_calls.h"
#include "pre_session_list.h"
#include "session_list.h" #include "session_list.h"
#include "session.h" #include "sesexec_control.h"
#include "sesman.h"
#include "string_calls.h" #include "string_calls.h"
/**************************************************************************//**
* Logs an authentication failure message
*
* @param username Username
* @param ip_addr IP address, if known
*
* The message is intended for use by fail2ban. Make changes with care.
*/
static void
log_authfail_message(const char *username, const char *ip_addr)
{
if (ip_addr == NULL || ip_addr[0] == '\0')
{
ip_addr = "unknown";
}
LOG(LOG_LEVEL_INFO, "AUTHFAIL: user=%s ip=%s time=%d",
username, ip_addr, g_time1());
}
/******************************************************************************/
/**
* Mode parameter for authenticate_and_authorize_connection()
*/
enum login_mode
{
AM_SYSTEM,
AM_UDS
};
/**
* Authenticate and authorize the connection
*
* @param sc Connection to sesman
* @param login_mode Describes the type of login in use
* @param uid UID for user
* @param username Name for user
* @param password Password (AM_SYSTEM) or NULL.
* @param ip_addr Remote IP address (AM_SYSTEM) or NULL.
* @return Status for the operation
*
* @pre sc->auth_info, sc->username and sc->ip_addr must be NULL
*
* @post If E_SCP_LOGIN_OK is returned, sc->auth_info is non-NULL
* @post If E_SCP_LOGIN_OK is returned, sc->username is non-NULL
* @post If E_SCP_LOGIN_OK is returned, sc->ip_addr is non-NULL
*
*/
static enum scp_login_status
authenticate_and_authorize_connection(struct sesman_con *sc,
enum login_mode login_mode,
int uid,
const char *username,
const char *password,
const char *ip_addr)
{
enum scp_login_status status = E_SCP_LOGIN_GENERAL_ERROR;
struct auth_info *auth_info = NULL;
/* Check preconditions */
if (sc->auth_info != NULL || sc->username != NULL || sc->ip_addr != NULL)
{
LOG(LOG_LEVEL_ERROR,
"Internal error - connection already logged in");
}
else
{
switch (login_mode)
{
case AM_SYSTEM:
auth_info = auth_userpass(username, password, ip_addr, &status);
break;
case AM_UDS:
auth_info = auth_uds(username, &status);
break;
default:
LOG(LOG_LEVEL_ERROR, "%s called with invalid mode %d",
__func__, (int)login_mode);
}
if (auth_info != NULL)
{
if (status != E_SCP_LOGIN_OK)
{
/* This shouldn't happen */
LOG(LOG_LEVEL_ERROR,
"Unexpected status return %d from auth call",
(int)status);
}
else if (!access_login_allowed(&g_cfg->sec, username))
{
status = E_SCP_LOGIN_NOT_AUTHORIZED;
LOG(LOG_LEVEL_INFO, "Username okay but group problem for "
"user: %s", username);
}
/* If all is well, put the auth_info in the sesman connection
* for later use. If not, remove the auth_info */
if (status == E_SCP_LOGIN_OK)
{
char *dup_username = g_strdup(username);
char *dup_ip_addr =
(ip_addr == NULL) ? g_strdup("") : g_strdup(ip_addr);
if (dup_username == NULL || dup_ip_addr == NULL)
{
LOG(LOG_LEVEL_ERROR, "%s : Memory allocation failed",
__func__);
g_free(dup_username);
g_free(dup_ip_addr);
status = E_SCP_LOGIN_NO_MEMORY;
}
else
{
LOG(LOG_LEVEL_INFO, "Access permitted for user=%s uid=%d",
username, uid);
sc->auth_info = auth_info;
sc->uid = uid;
sc->username = dup_username;
sc->ip_addr = dup_ip_addr;
}
}
if (status != E_SCP_LOGIN_OK)
{
auth_end(auth_info);
}
}
}
return status;
}
/******************************************************************************/ /******************************************************************************/
static int static int
process_set_peername_request(struct sesman_con *sc) process_set_peername_request(struct pre_session_item *psi)
{ {
int rv; int rv;
const char *peername; const char *peername;
rv = scp_get_set_peername_request(sc->t, &peername); rv = scp_get_set_peername_request(psi->client_trans, &peername);
if (rv == 0) if (rv == 0)
{ {
if (sesman_set_connection_peername(sc, peername) != 0) if (pre_session_list_set_peername(psi, peername) != 0)
{ {
LOG(LOG_LEVEL_WARNING, LOG(LOG_LEVEL_WARNING,
"Failed to set connection peername from %s to %s", "Failed to set connection peername from %s to %s",
sc->peername, peername); psi->peername, peername);
} }
} }
@ -199,68 +68,142 @@ process_set_peername_request(struct sesman_con *sc)
} }
/******************************************************************************/ /******************************************************************************/
/** static int
* Allocates a chain item and starts the session process_sys_login_request(struct pre_session_item *psi)
*/
static enum scp_screate_status
allocate_and_start_session(struct auth_info *auth_info,
const char *username,
const char *ip_addr,
const struct session_parameters *params)
{ {
int pid = 0; int rv;
enum scp_screate_status status; const char *username;
struct session_item *si; const char *password;
const char *ip_addr;
int send_client_reply = 1;
/* check to limit concurrent sessions */ rv = scp_get_sys_login_request(psi->client_trans, &username,
if (session_list_get_count() >= (unsigned int)g_cfg->sess.max_sessions) &password, &ip_addr);
if (rv == 0)
{ {
LOG(LOG_LEVEL_ERROR, "max concurrent session limit " enum scp_login_status errorcode;
"exceeded. login for user %s denied", username);
return E_SCP_SCREATE_MAX_REACHED;
}
si = session_new(); LOG(LOG_LEVEL_INFO,
if (si == NULL) "Received system login request from %s for user: %s IP: %s",
{ psi->peername, username, ip_addr);
LOG(LOG_LEVEL_ERROR, "Out of memory error: cannot create new session "
"element - user %s", username);
return E_SCP_SCREATE_NO_MEMORY;
}
status = session_start(auth_info, params, &pid); if (psi->login_state != E_PS_LOGIN_NOT_LOGGED_IN)
if (status == E_SCP_SCREATE_OK)
{
if (ip_addr[0] != '\0')
{ {
LOG(LOG_LEVEL_INFO, "++ created session: username %s, ip %s", errorcode = E_SCP_LOGIN_ALREADY_LOGGED_IN;
username, ip_addr); LOG(LOG_LEVEL_ERROR, "Connection is already logged in for %s",
psi->username);
}
else if ((psi->username = g_strdup(username)) == NULL)
{
errorcode = E_SCP_LOGIN_NO_MEMORY;
LOG(LOG_LEVEL_ERROR, "Memory allocation failure logging in %s",
username);
} }
else else
{ {
LOG(LOG_LEVEL_INFO, "++ created session: username %s", username); /* Create a sesexec process to handle the login
*
* We won't check for the user being valid here, as this might
* lead to information leakage */
if (sesexec_start(psi) != 0)
{
LOG(LOG_LEVEL_ERROR,
"Can't start sesexec to authenticate user");
errorcode = E_SCP_LOGIN_GENERAL_ERROR;
}
else
{
int eicp_stat;
eicp_stat = eicp_send_sys_login_request(psi->sesexec_trans,
username,
password,
ip_addr,
psi->client_trans->sck);
if (eicp_stat != 0)
{
LOG(LOG_LEVEL_ERROR,
"Can't ask sesexec to authenticate user");
errorcode = E_SCP_LOGIN_GENERAL_ERROR;
}
else
{
/* We've handed over responsibility for the
* SCP communication */
send_client_reply = 0;
psi->dispatcher_action = E_PSD_REMOVE_CLIENT_TRANS;
}
}
} }
si->pid = pid; if (send_client_reply)
si->display = params->display; {
si->width = params->width; /* We only get here if something has gone
si->height = params->height; * wrong with the handover to sesexec */
si->bpp = params->bpp; rv = scp_send_login_response(psi->client_trans, errorcode, 1);
si->auth_info = auth_info; psi->dispatcher_action = E_PSD_TERMINATE_PRE_SESSION;
g_strncpy(si->start_ip_addr, ip_addr, }
sizeof(si->start_ip_addr) - 1);
si->uid = params->uid;
si->guid = params->guid;
si->start_time = g_time1();
si->type = params->type;
si->status = SESMAN_SESSION_STATUS_ACTIVE;
} }
else
return rv;
}
/******************************************************************************/
/**
* Authenticate and authorize a UDS connection
*
* @param psi Connection to sesman
* @param uid UID for user
* @param username Name for user
* @return Status for the operation
*
* @post If E_SCP_LOGIN_OK is returned, psi->username is non-NULL
*/
static enum scp_login_status
authenticate_and_authorize_uds_connection(struct pre_session_item *psi,
int uid,
const char *username)
{
enum scp_login_status status = E_SCP_LOGIN_GENERAL_ERROR;
struct auth_info *auth_info = auth_uds(username, &status);
if (auth_info != NULL)
{ {
// Remove session item from the list if (status != E_SCP_LOGIN_OK)
session_list_kill(-1); {
/* This shouldn't happen */
LOG(LOG_LEVEL_ERROR,
"Unexpected status return %d from auth_uds call",
(int)status);
}
else if (!access_login_allowed(&g_cfg->sec, username))
{
status = E_SCP_LOGIN_NOT_AUTHORIZED;
LOG(LOG_LEVEL_INFO, "Username okay but group problem for "
"user: %s", username);
}
/* If all is well, add info to the sesman connection for later use */
if (status == E_SCP_LOGIN_OK)
{
if ((psi->username = g_strdup(username)) == NULL)
{
LOG(LOG_LEVEL_ERROR, "%s : Memory allocation failed",
__func__);
g_free(psi->username);
psi->username = NULL;
status = E_SCP_LOGIN_NO_MEMORY;
}
else
{
LOG(LOG_LEVEL_INFO, "Access permitted for user: %s",
username);
psi->login_state = E_PS_LOGIN_UDS;
psi->uid = uid;
psi->start_ip_addr[0] = '\0';
}
}
auth_end(auth_info);
} }
return status; return status;
@ -269,101 +212,7 @@ allocate_and_start_session(struct auth_info *auth_info,
/******************************************************************************/ /******************************************************************************/
static int static int
process_sys_login_request(struct sesman_con *sc) process_uds_login_request(struct pre_session_item *psi)
{
int rv;
const char *supplied_username;
const char *password;
const char *ip_addr;
rv = scp_get_sys_login_request(sc->t, &supplied_username,
&password, &ip_addr);
if (rv == 0)
{
enum scp_login_status errorcode;
int server_closed = 1;
int uid;
char *username = NULL;
LOG(LOG_LEVEL_INFO,
"Received system login request from %s for user: %s IP: %s",
sc->peername, supplied_username, ip_addr);
if (sc->auth_info != NULL)
{
errorcode = E_SCP_LOGIN_ALREADY_LOGGED_IN;
LOG(LOG_LEVEL_ERROR, "Connection is already logged in for %s",
sc->username);
}
else if (g_getuser_info_by_name(supplied_username,
&uid, NULL, NULL, NULL, NULL) != 0)
{
/* we can't get a UID for the user */
errorcode = E_SCP_LOGIN_NOT_AUTHENTICATED;
LOG(LOG_LEVEL_ERROR, "Can't get UID for user %s",
supplied_username);
log_authfail_message(username, ip_addr);
}
else if (g_getuser_info_by_uid(uid,
&username, NULL, NULL, NULL, NULL) != 0)
{
errorcode = E_SCP_LOGIN_GENERAL_ERROR;
LOG(LOG_LEVEL_ERROR, "Can't reverse lookup UID %d", uid);
}
else
{
if (g_strcmp(supplied_username, username) != 0)
{
/*
* If using a federated naming service (e.g. AD), the
* username supplied may not match that name mapped to by
* the UID. We will generate a warning in this instance so
* the user can see what is being used within sesman
*/
LOG(LOG_LEVEL_WARNING,
"Using username %s for the session (from UID %d)",
username, uid);
}
errorcode = authenticate_and_authorize_connection(
sc, AM_SYSTEM,
uid, username,
password, ip_addr);
if (errorcode == E_SCP_LOGIN_OK)
{
server_closed = 0;
}
else if (errorcode == E_SCP_LOGIN_NOT_AUTHENTICATED)
{
log_authfail_message(username, ip_addr);
if (sc->auth_retry_count > 0)
{
/* Password problem? Invite the user to retry */
server_closed = 0;
--sc->auth_retry_count;
}
}
g_free(username);
}
if (server_closed)
{
/* Expecting no more client messages. Close the connection
* after returning from this callback */
sc->close_requested = 1;
}
rv = scp_send_login_response(sc->t, errorcode, server_closed);
}
return rv;
}
/******************************************************************************/
static int
process_uds_login_request(struct sesman_con *sc)
{ {
enum scp_login_status errorcode; enum scp_login_status errorcode;
int rv; int rv;
@ -372,25 +221,25 @@ process_uds_login_request(struct sesman_con *sc)
char *username = NULL; char *username = NULL;
int server_closed = 1; int server_closed = 1;
rv = g_sck_get_peer_cred(sc->t->sck, &pid, &uid, NULL); rv = g_sck_get_peer_cred(psi->client_trans->sck, &pid, &uid, NULL);
if (rv != 0) if (rv != 0)
{ {
LOG(LOG_LEVEL_INFO, LOG(LOG_LEVEL_INFO,
"Unable to get peer credentials for socket %d", "Unable to get peer credentials for socket %d",
(int)sc->t->sck); (int)psi->client_trans->sck);
errorcode = E_SCP_LOGIN_GENERAL_ERROR; errorcode = E_SCP_LOGIN_GENERAL_ERROR;
} }
else else
{ {
LOG(LOG_LEVEL_INFO, LOG(LOG_LEVEL_INFO,
"Received UDS login request from %s for UID: %d from PID: %d", "Received UDS login request from %s for UID: %d from PID: %d",
sc->peername, uid, pid); psi->peername, uid, pid);
if (sc->auth_info != NULL) if (psi->login_state != E_PS_LOGIN_NOT_LOGGED_IN)
{ {
errorcode = E_SCP_LOGIN_ALREADY_LOGGED_IN; errorcode = E_SCP_LOGIN_ALREADY_LOGGED_IN;
LOG(LOG_LEVEL_ERROR, "Connection is already logged in for %s", LOG(LOG_LEVEL_ERROR, "Connection is already logged in for %s",
sc->username); psi->username);
} }
else if (g_getuser_info_by_uid(uid, &username, else if (g_getuser_info_by_uid(uid, &username,
NULL, NULL, NULL, NULL) != 0) NULL, NULL, NULL, NULL) != 0)
@ -400,10 +249,8 @@ process_uds_login_request(struct sesman_con *sc)
} }
else else
{ {
errorcode = authenticate_and_authorize_connection( errorcode = authenticate_and_authorize_uds_connection(
sc, AM_UDS, psi, uid, username);
uid, username,
NULL, NULL);
g_free(username); g_free(username);
if (errorcode == E_SCP_LOGIN_OK) if (errorcode == E_SCP_LOGIN_OK)
@ -416,27 +263,40 @@ process_uds_login_request(struct sesman_con *sc)
if (server_closed) if (server_closed)
{ {
/* Close the connection after returning from this callback */ /* Close the connection after returning from this callback */
sc->close_requested = 1; psi->dispatcher_action = E_PSD_TERMINATE_PRE_SESSION;
} }
return scp_send_login_response(sc->t, errorcode, server_closed); return scp_send_login_response(psi->client_trans, errorcode, server_closed);
}
/******************************************************************************/
static void
logout_pre_session(struct pre_session_item *psi)
{
if (psi->login_state != E_PS_LOGIN_NOT_LOGGED_IN)
{
(void)eicp_send_logout_request(psi->sesexec_trans);
trans_delete(psi->sesexec_trans);
psi->sesexec_trans = NULL;
psi->uid = (uid_t) -1;
g_free(psi->username);
psi->username = NULL;
psi->start_ip_addr[0] = '\0';
psi->login_state = E_PS_LOGIN_NOT_LOGGED_IN;
}
} }
/******************************************************************************/ /******************************************************************************/
static int static int
process_logout_request(struct sesman_con *sc) process_logout_request(struct pre_session_item *psi)
{ {
if (sc->auth_info != NULL) if (psi->login_state != E_PS_LOGIN_NOT_LOGGED_IN)
{ {
LOG(LOG_LEVEL_INFO, "Logging out %s from sesman", sc->username); LOG(LOG_LEVEL_INFO, "Logging out %s from sesman", psi->username);
auth_end(sc->auth_info); logout_pre_session(psi);
sc->auth_info = NULL;
sc->uid = -1;
g_free(sc->username);
sc->username = NULL;
g_free(sc->ip_addr);
sc->ip_addr = NULL;
} }
return 0; return 0;
@ -445,117 +305,146 @@ process_logout_request(struct sesman_con *sc)
/******************************************************************************/ /******************************************************************************/
static int static int
process_create_session_request(struct sesman_con *sc) process_create_session_request(struct pre_session_item *psi)
{ {
int rv; int rv;
// Parameters for a new session (if required). Filled in as /* Client parameters describing new session*/
// we go along. enum scp_session_type type;
struct session_parameters sp = {0}; unsigned short width;
const char *shellptr; unsigned short height;
const char *dirptr; unsigned char bpp;
const char *shell;
const char *directory;
struct guid guid;
int display = 0;
struct session_item *s_item = NULL;
int send_client_reply = 1;
enum scp_screate_status status = E_SCP_SCREATE_OK; enum scp_screate_status status = E_SCP_SCREATE_OK;
int display = 0; rv = scp_get_create_session_request(psi->client_trans,
struct guid guid; &type, &width, &height,
&bpp, &shell, &directory);
guid_clear(&guid);
rv = scp_get_create_session_request(sc->t,
&sp.type, &sp.width, &sp.height,
&sp.bpp, &shellptr, &dirptr);
if (rv == 0) if (rv == 0)
{ {
if (sc->auth_info == NULL) if (psi->login_state == E_PS_LOGIN_NOT_LOGGED_IN)
{ {
status = E_SCP_SCREATE_NOT_LOGGED_IN; status = E_SCP_SCREATE_NOT_LOGGED_IN;
} }
else else
{ {
LOG(LOG_LEVEL_INFO, LOG(LOG_LEVEL_INFO,
"Received request from %s to create a session for user %s" "Received request from %s to create a session for user %s",
" type=%s" psi->peername, psi->username);
" geometry=%dx%d, bpp=%d, shell=\"%s\", dir=\"%s\"",
sc->peername, sc->username,
SCP_SESSION_TYPE_TO_STR(sp.type),
sp.width, sp.height, sp.bpp, shellptr, dirptr);
struct session_item *s_item = s_item = session_list_get_bydata(psi->uid, type, width, height,
session_list_get_bydata(sc->uid, sp.type, sp.width, sp.height, bpp, psi->start_ip_addr);
sp.bpp, sc->ip_addr); if (s_item != NULL)
if (s_item != 0)
{ {
// Found an existing session // Found an existing session
if (sc->ip_addr[0] != '\0') display = s_item->display;
guid = s_item->guid;
// Tell the existing session to run the reconnect script.
// We ignore errors at this level, as any comms errors
// will be picked up in the main loop
(void)ercp_send_session_reconnect_event(s_item->sesexec_trans);
if (psi->start_ip_addr[0] != '\0')
{ {
LOG( LOG_LEVEL_INFO, "++ reconnected session: username %s, " LOG( LOG_LEVEL_INFO, "++ reconnected session: username %s, "
"display :%d.0, session_pid %d, ip %s", "display :%d.0, session_pid %d, ip %s",
sc->username, s_item->display, s_item->pid, psi->username, display,
sc->ip_addr); s_item->sesexec_pid, psi->start_ip_addr);
} }
else else
{ {
LOG(LOG_LEVEL_INFO, "++ reconnected session: username %s, " LOG(LOG_LEVEL_INFO, "++ reconnected session: username %s, "
"display :%d.0, session_pid %d", "display :%d.0, session_pid %d",
sc->username, s_item->display, s_item->pid); psi->username, display, s_item->sesexec_pid);
} }
// Get values for response to SCP client // If we created an authentication process for this SCP
display = s_item->display; // connection, close it gracefully
guid = s_item->guid; logout_pre_session(psi);
}
session_reconnect(s_item->display, sc->uid, sc->auth_info); // Need to create a new session
else if (g_cfg->sess.max_sessions > 0 &&
session_list_get_count() >= g_cfg->sess.max_sessions)
{
status = E_SCP_SCREATE_MAX_REACHED;
}
else if ((display = session_list_get_available_display()) < 0)
{
status = E_SCP_SCREATE_NO_DISPLAY;
}
// Create an entry on the session list for the new session
else if ((s_item = session_list_new()) == NULL)
{
status = E_SCP_SCREATE_NO_MEMORY;
}
// Create a sesexec process if we don't have one (UDS login)
else if (psi->sesexec_trans == NULL && sesexec_start(psi) != 0)
{
LOG(LOG_LEVEL_ERROR,
"Can't start sesexec to authenticate user");
status = E_SCP_SCREATE_GENERAL_ERROR;
} }
else else
{ {
// Need to create a new session // Pass the session create request to sesexec
// int eicp_stat;
// Get the rest of the parameters for the session eicp_stat = eicp_send_create_session_request(
guid = guid_new(); psi->sesexec_trans,
display = session_list_get_available_display(); psi->client_trans->sck,
display,
type, width, height,
bpp, shell, directory);
sp.display = display; if (eicp_stat != 0)
sp.uid = sc->uid;
sp.guid = guid;
// These need to be copied so they are available
// when the sub-process closes all the connections
g_snprintf(sp.shell, sizeof(sp.shell), "%s", shellptr);
g_snprintf(sp.directory, sizeof(sp.directory), "%s", dirptr);
if (display == 0)
{ {
status = E_SCP_SCREATE_NO_DISPLAY; LOG(LOG_LEVEL_ERROR,
"Can't ask sesexec to authenticate user");
status = E_SCP_SCREATE_GENERAL_ERROR;
} }
else else
{ {
// The new session will have a lifetime longer than // We've handed over responsibility for the
// the sesman connection, and so needs to own // SCP communication
// the auth_info struct. send_client_reply = 0;
//
// Copy the auth_info struct out of the connection and pass
// it to the session
struct auth_info *auth_info = sc->auth_info;
sc->auth_info = NULL;
status = allocate_and_start_session(auth_info, // Further comms from sesexec comes over the ERCP
sc->username, // protocol
sc->ip_addr, ercp_trans_from_eicp_trans(psi->sesexec_trans,
&sp); sesman_ercp_data_in,
if (status != E_SCP_SCREATE_OK) (void *)s_item);
{
// Close the auth session down as it can't be re-used. // Move the transport over to the session list item
auth_end(auth_info); s_item->sesexec_trans = psi->sesexec_trans;
} s_item->sesexec_pid = psi->sesexec_pid;
psi->sesexec_trans = NULL;
psi->sesexec_pid = 0;
// Add the display to the session item so we don't try
// to allocate it to another session
s_item->display = display;
} }
} }
} }
/* Currently a create session request is the last thing on a // Currently a create session request is the last thing on a
* connection, and results in automatic closure */ // connection, and results in automatic closure
sc->close_requested = 1; //
// We may have passed the client_trans over to sesexec. If so,
rv = scp_send_create_session_response(sc->t, status, // we can't send a reply here.
display, &guid); psi->dispatcher_action = E_PSD_TERMINATE_PRE_SESSION;
if (send_client_reply)
{
rv = scp_send_create_session_response(psi->client_trans,
status, display, &guid);
}
} }
return rv; return rv;
@ -564,7 +453,7 @@ process_create_session_request(struct sesman_con *sc)
/******************************************************************************/ /******************************************************************************/
static int static int
process_list_sessions_request(struct sesman_con *sc) process_list_sessions_request(struct pre_session_item *psi)
{ {
int rv = 0; int rv = 0;
@ -572,9 +461,9 @@ process_list_sessions_request(struct sesman_con *sc)
unsigned int cnt = 0; unsigned int cnt = 0;
unsigned int i; unsigned int i;
if (sc->auth_info == NULL) if (psi->login_state == E_PS_LOGIN_NOT_LOGGED_IN)
{ {
rv = scp_send_list_sessions_response(sc->t, rv = scp_send_list_sessions_response(psi->client_trans,
E_SCP_LS_NOT_LOGGED_IN, E_SCP_LS_NOT_LOGGED_IN,
NULL); NULL);
} }
@ -582,14 +471,13 @@ process_list_sessions_request(struct sesman_con *sc)
{ {
LOG(LOG_LEVEL_INFO, LOG(LOG_LEVEL_INFO,
"Received request from %s to list sessions for user %s", "Received request from %s to list sessions for user %s",
sc->peername, sc->username); psi->peername, psi->username);
info = session_list_get_byuid(sc->uid, &cnt, info = session_list_get_byuid(psi->uid, &cnt, 0);
SESMAN_SESSION_STATUS_ALL);
for (i = 0; rv == 0 && i < cnt; ++i) for (i = 0; rv == 0 && i < cnt; ++i)
{ {
rv = scp_send_list_sessions_response(sc->t, rv = scp_send_list_sessions_response(psi->client_trans,
E_SCP_LS_SESSION_INFO, E_SCP_LS_SESSION_INFO,
&info[i]); &info[i]);
} }
@ -597,7 +485,7 @@ process_list_sessions_request(struct sesman_con *sc)
if (rv == 0) if (rv == 0)
{ {
rv = scp_send_list_sessions_response(sc->t, rv = scp_send_list_sessions_response(psi->client_trans,
E_SCP_LS_END_OF_LIST, E_SCP_LS_END_OF_LIST,
NULL); NULL);
} }
@ -609,54 +497,54 @@ process_list_sessions_request(struct sesman_con *sc)
/******************************************************************************/ /******************************************************************************/
static int static int
process_close_connection_request(struct sesman_con *sc) process_close_connection_request(struct pre_session_item *psi)
{ {
int rv = 0; int rv = 0;
LOG(LOG_LEVEL_INFO, "Received request to close connection from %s", LOG(LOG_LEVEL_INFO, "Received request to close connection from %s",
sc->peername); psi->peername);
/* Expecting no more client messages. Close the connection /* Expecting no more client messages. Close the connection
* after returning from this callback */ * after returning from this callback */
sc->close_requested = 1; psi->dispatcher_action = E_PSD_TERMINATE_PRE_SESSION;
return rv; return rv;
} }
/******************************************************************************/ /******************************************************************************/
int int
scp_process(struct sesman_con *sc) scp_process(struct pre_session_item *psi)
{ {
enum scp_msg_code msgno; enum scp_msg_code msgno;
int rv = 0; int rv = 0;
switch ((msgno = scp_msg_in_get_msgno(sc->t))) switch ((msgno = scp_msg_in_get_msgno(psi->client_trans)))
{ {
case E_SCP_SET_PEERNAME_REQUEST: case E_SCP_SET_PEERNAME_REQUEST:
rv = process_set_peername_request(sc); rv = process_set_peername_request(psi);
break; break;
case E_SCP_SYS_LOGIN_REQUEST: case E_SCP_SYS_LOGIN_REQUEST:
rv = process_sys_login_request(sc); rv = process_sys_login_request(psi);
break; break;
case E_SCP_UDS_LOGIN_REQUEST: case E_SCP_UDS_LOGIN_REQUEST:
rv = process_uds_login_request(sc); rv = process_uds_login_request(psi);
break; break;
case E_SCP_LOGOUT_REQUEST: case E_SCP_LOGOUT_REQUEST:
rv = process_logout_request(sc); rv = process_logout_request(psi);
break; break;
case E_SCP_CREATE_SESSION_REQUEST: case E_SCP_CREATE_SESSION_REQUEST:
rv = process_create_session_request(sc); rv = process_create_session_request(psi);
break; break;
case E_SCP_LIST_SESSIONS_REQUEST: case E_SCP_LIST_SESSIONS_REQUEST:
rv = process_list_sessions_request(sc); rv = process_list_sessions_request(psi);
break; break;
case E_SCP_CLOSE_CONNECTION_REQUEST: case E_SCP_CLOSE_CONNECTION_REQUEST:
rv = process_close_connection_request(sc); rv = process_close_connection_request(psi);
break; break;
default: default:
@ -668,3 +556,4 @@ scp_process(struct sesman_con *sc)
} }
return rv; return rv;
} }

4
sesman/scp_process.h
View File

@ -27,7 +27,7 @@
#ifndef SCP_PROCESS_H #ifndef SCP_PROCESS_H
#define SCP_PROCESS_H #define SCP_PROCESS_H
struct sesman_con; struct pre_session_item;
/** /**
* *
@ -36,6 +36,6 @@ struct sesman_con;
* *
*/ */
int int
scp_process(struct sesman_con *sc); scp_process(struct pre_session_item *sc);
#endif #endif

336
sesman/sesman.c
View File

@ -35,23 +35,26 @@
#include "sesman_auth.h" #include "sesman_auth.h"
#include "sesman_config.h" #include "sesman_config.h"
#include "eicp.h"
#include "eicp_process.h"
#include "ercp.h"
#include "ercp_process.h"
#include "pre_session_list.h"
#include "session_list.h" #include "session_list.h"
#include "lock_uds.h" #include "lock_uds.h"
#include "os_calls.h" #include "os_calls.h"
#include "scp.h" #include "scp.h"
#include "scp_process.h" #include "scp_process.h"
#include "sesexec_control.h"
#include "sig.h" #include "sig.h"
#include "string_calls.h" #include "string_calls.h"
#include "trans.h" #include "trans.h"
#include "xrdp_configure_options.h" #include "xrdp_configure_options.h"
/** /**
* Maximum number of short-lived connections to sesman * Maximum number of pre-session items
*
* At the moment, all connections to sesman are short-lived. This may change
* in the future
*/ */
#define MAX_SHORT_LIVED_CONNECTIONS 16 #define MAX_PRE_SESSION_ITEMS 16
/** /**
* Define the mode of operation of the program * Define the mode of operation of the program
@ -74,7 +77,6 @@ struct sesman_startup_params
}; };
struct config_sesman *g_cfg; struct config_sesman *g_cfg;
unsigned char g_fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
static tintptr g_term_event = 0; static tintptr g_term_event = 0;
static tintptr g_sigchld_event = 0; static tintptr g_sigchld_event = 0;
static tintptr g_reload_event = 0; static tintptr g_reload_event = 0;
@ -114,68 +116,6 @@ static int nocase_matches(const char *candidate, ...)
return result; return result;
} }
/**
* Allocates a sesman_con struct
*
* @param trans Pointer to newly-allocated transport
* @return struct sesman_con pointer
*/
static struct sesman_con *
alloc_connection(struct trans *t)
{
struct sesman_con *result;
if ((result = g_new0(struct sesman_con, 1)) != NULL)
{
g_snprintf(result->peername, sizeof(result->peername), "%s", "unknown");
result->t = t;
result->auth_retry_count = g_cfg->sec.login_retry;
}
return result;
}
/**
* Deletes a sesman_con struct, freeing resources
*
* After this call, the passed-in pointer is invalid and must not be
* referenced.
*
* Any auth_info struct found in the sesman_con is also deallocated.
*
* @param sc struct to de-allocate
*/
static void
delete_connection(struct sesman_con *sc)
{
if (sc != NULL)
{
trans_delete(sc->t);
if (sc->auth_info != NULL)
{
auth_end(sc->auth_info);
}
g_free(sc->username);
g_free(sc->ip_addr);
g_free(sc);
}
}
/*****************************************************************************/
int
sesman_set_connection_peername(struct sesman_con *sc, const char *name)
{
int rv = 1;
if (sc != NULL && name != NULL)
{
g_snprintf(sc->peername, sizeof(sc->peername), "%s", name);
rv = 0;
}
return rv;
}
/*****************************************************************************/ /*****************************************************************************/
/** /**
* *
@ -301,40 +241,25 @@ static int sesman_listen_test(struct config_sesman *cfg)
/******************************************************************************/ /******************************************************************************/
int int
sesman_close_all(unsigned int flags) sesman_close_all(void)
{ {
int index;
struct sesman_con *sc;
LOG_DEVEL(LOG_LEVEL_TRACE, "sesman_close_all:"); LOG_DEVEL(LOG_LEVEL_TRACE, "sesman_close_all:");
pre_session_list_cleanup();
session_list_cleanup();
g_delete_wait_obj(g_reload_event);
g_delete_wait_obj(g_sigchld_event);
g_delete_wait_obj(g_term_event);
sesman_delete_listening_transport(); sesman_delete_listening_transport();
for (index = 0; index < g_con_list->count; index++)
{
sc = (struct sesman_con *) list_get_item(g_con_list, index);
if (sc != NULL && (flags & SCA_CLOSE_AUTH_INFO) == 0)
{
// Prevent delete_connection() closing the auth_info down
sc->auth_info = NULL;
}
delete_connection(sc);
}
return 0; return 0;
} }
/******************************************************************************/ /******************************************************************************/
void int
sesman_delete_wait_objects(void) sesman_scp_data_in(struct trans *self)
{
g_delete_wait_obj(g_reload_event);
g_delete_wait_obj(g_sigchld_event);
g_delete_wait_obj(g_term_event);
}
/******************************************************************************/
static int
sesman_data_in(struct trans *self)
{ {
int rv; int rv;
int available; int available;
@ -343,8 +268,10 @@ sesman_data_in(struct trans *self)
if (rv == 0 && available) if (rv == 0 && available)
{ {
struct sesman_con *sc = (struct sesman_con *)self->callback_data; struct pre_session_item *psi;
if ((rv = scp_process(sc)) != 0) psi = (struct pre_session_item *)self->callback_data;
if ((rv = scp_process(psi)) != 0)
{ {
LOG(LOG_LEVEL_ERROR, "sesman_data_in: scp_process_msg failed"); LOG(LOG_LEVEL_ERROR, "sesman_data_in: scp_process_msg failed");
} }
@ -358,30 +285,79 @@ sesman_data_in(struct trans *self)
static int static int
sesman_listen_conn_in(struct trans *self, struct trans *new_self) sesman_listen_conn_in(struct trans *self, struct trans *new_self)
{ {
struct sesman_con *sc; struct pre_session_item *psi;
if (g_con_list->count >= MAX_SHORT_LIVED_CONNECTIONS) if (pre_session_list_get_count() >= MAX_PRE_SESSION_ITEMS)
{ {
LOG(LOG_LEVEL_ERROR, "sesman_data_in: error, too many " LOG(LOG_LEVEL_ERROR, "sesman_listen_conn_in: error, too many "
"connections, rejecting"); "connections, rejecting");
trans_delete(new_self); trans_delete(new_self);
} }
else if ((sc = alloc_connection(new_self)) == NULL || else if ((psi = pre_session_list_new()) == NULL)
scp_init_trans(new_self) != 0)
{ {
LOG(LOG_LEVEL_ERROR, "sesman_data_in: No memory to allocate " LOG(LOG_LEVEL_ERROR, "sesman_data_in: No memory to allocate "
"new connection"); "new connection");
delete_connection(sc); trans_delete(new_self);
}
else if (scp_init_trans(new_self) != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_data_in: Can't init SCP connection");
trans_delete(new_self);
} }
else else
{ {
new_self->callback_data = (void *)sc; new_self->callback_data = (void *)psi;
new_self->trans_data_in = sesman_data_in; new_self->trans_data_in = sesman_scp_data_in;
list_add_item(g_con_list, (intptr_t) sc); psi->client_trans = new_self;
} }
return 0; return 0;
} }
/******************************************************************************/
int
sesman_eicp_data_in(struct trans *self)
{
int rv;
int available;
rv = eicp_msg_in_check_available(self, &available);
if (rv == 0 && available)
{
struct pre_session_item *psi;
psi = (struct pre_session_item *)self->callback_data;
if ((rv = eicp_process(psi)) != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_eicp_data_in: eicp_process_msg failed");
}
eicp_msg_in_reset(self);
}
return rv;
}
/******************************************************************************/
int
sesman_ercp_data_in(struct trans *self)
{
int rv;
int available;
rv = ercp_msg_in_check_available(self, &available);
if (rv == 0 && available)
{
struct session_item *si = (struct session_item *)self->callback_data;
if ((rv = ercp_process(si)) != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_ercp_data_in: ercp_process_msg failed");
}
ercp_msg_in_reset(self);
}
return rv;
}
/******************************************************************************/ /******************************************************************************/
/** /**
* Informs the main loop a termination signal has been received * Informs the main loop a termination signal has been received
@ -396,9 +372,21 @@ set_term_event(int sig)
} }
} }
/*****************************************************************************/
/* No-op signal handler.
*/
static void
sig_no_op(int sig)
{
/* no-op */
}
/******************************************************************************/ /******************************************************************************/
/** /**
* Informs the main loop a SIGCHLD has been received * Catch a SIGCHLD and ignore the main loop
*
* In theory we could use waitpid() in the signal handler, but that
* would prevent us adding any logging
*/ */
static void static void
set_sigchld_event(int sig) set_sigchld_event(int sig)
@ -438,7 +426,7 @@ sesman_delete_listening_transport(void)
} }
g_list_trans = NULL; g_list_trans = NULL;
unlock_uds(g_list_trans_lock); unlock_uds(g_list_trans_lock); // Won't unlock anything for a child process
g_list_trans_lock = NULL; g_list_trans_lock = NULL;
} }
@ -489,6 +477,13 @@ sesman_create_listening_transport(const struct config_sesman *cfg)
return rv; return rv;
} }
/******************************************************************************/
int
sesman_is_term(void)
{
return g_is_wait_obj_set(g_term_event);
}
/******************************************************************************/ /******************************************************************************/
/** /**
* *
@ -500,12 +495,7 @@ sesman_main_loop(void)
{ {
int error; int error;
int robjs_count; int robjs_count;
int wobjs_count; intptr_t robjs[1024];
int timeout;
int index;
intptr_t robjs[32];
intptr_t wobjs[32];
struct sesman_con *scon;
g_con_list = list_create(); g_con_list = list_create();
if (g_con_list == NULL) if (g_con_list == NULL)
@ -525,47 +515,41 @@ sesman_main_loop(void)
error = 0; error = 0;
while (!error) while (!error)
{ {
timeout = -1;
robjs_count = 0; robjs_count = 0;
robjs[robjs_count++] = g_term_event; robjs[robjs_count++] = g_term_event;
robjs[robjs_count++] = g_sigchld_event; robjs[robjs_count++] = g_sigchld_event;
robjs[robjs_count++] = g_reload_event; robjs[robjs_count++] = g_reload_event;
wobjs_count = 0;
for (index = 0; index < g_con_list->count; index++)
{
scon = (struct sesman_con *)list_get_item(g_con_list, index);
if (scon != NULL)
{
error = trans_get_wait_objs_rw(scon->t,
robjs, &robjs_count,
wobjs, &wobjs_count, &timeout);
if (error != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"trans_get_wait_objs_rw failed");
break;
}
}
}
if (error != 0)
{
break;
}
if (g_list_trans != NULL) if (g_list_trans != NULL)
{ {
/* g_list_trans might be NULL on a reconfigure if sesman /* g_list_trans might be NULL on a reconfigure if sesman
* is unable to listen again */ * is unable to listen again */
error = trans_get_wait_objs_rw(g_list_trans, robjs, &robjs_count, error = trans_get_wait_objs(g_list_trans, robjs, &robjs_count);
wobjs, &wobjs_count, &timeout);
if (error != 0) if (error != 0)
{ {
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: " LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"trans_get_wait_objs_rw failed"); "trans_get_wait_objs failed");
break; break;
} }
} }
if (g_obj_wait(robjs, robjs_count, wobjs, wobjs_count, timeout) != 0) error = pre_session_list_get_wait_objs(robjs, &robjs_count);
if (error != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"pre_session_list_get_wait_objs failed");
break;
}
error = session_list_get_wait_objs(robjs, &robjs_count);
if (error != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"session_list_get_wait_objs failed");
break;
}
if (g_obj_wait(robjs, robjs_count, NULL, 0, -1) != 0)
{ {
/* should not get here */ /* should not get here */
LOG(LOG_LEVEL_WARNING, "sesman_main_loop: " LOG(LOG_LEVEL_WARNING, "sesman_main_loop: "
@ -580,10 +564,14 @@ sesman_main_loop(void)
break; break;
} }
if (g_is_wait_obj_set(g_sigchld_event)) /* A child has exited */ if (g_is_wait_obj_set(g_sigchld_event)) /* term */
{ {
g_reset_wait_obj(g_sigchld_event); g_reset_wait_obj(g_sigchld_event);
sig_sesman_session_end(); // Prevent any zombies from hanging around
while (g_waitchild(NULL) > 0)
{
;
}
} }
if (g_is_wait_obj_set(g_reload_event)) /* We're asked to reload */ if (g_is_wait_obj_set(g_reload_event)) /* We're asked to reload */
@ -592,33 +580,6 @@ sesman_main_loop(void)
sig_sesman_reload_cfg(); sig_sesman_reload_cfg();
} }
index = 0;
while (index < g_con_list->count)
{
int remove_con = 0;
scon = (struct sesman_con *)list_get_item(g_con_list, index);
if (trans_check_wait_objs(scon->t) != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"trans_check_wait_objs failed, removing trans");
remove_con = 1;
}
else if (scon->close_requested)
{
remove_con = 1;
}
if (remove_con)
{
delete_connection(scon);
list_remove_item(g_con_list, index);
}
else
{
++index;
}
}
if (g_list_trans != NULL) if (g_list_trans != NULL)
{ {
error = trans_check_wait_objs(g_list_trans); error = trans_check_wait_objs(g_list_trans);
@ -629,11 +590,25 @@ sesman_main_loop(void)
break; break;
} }
} }
error = pre_session_list_check_wait_objs();
if (error != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"pre_session_list_check_wait_objs failed");
break;
}
error = session_list_check_wait_objs();
if (error != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
"session_list_check_wait_objs failed");
break;
}
} }
sesman_close_all(SCA_CLOSE_AUTH_INFO); return error;
list_delete(g_con_list);
return 0;
} }
/*****************************************************************************/ /*****************************************************************************/
@ -642,7 +617,7 @@ print_version(void)
{ {
g_writeln("xrdp-sesman %s", PACKAGE_VERSION); g_writeln("xrdp-sesman %s", PACKAGE_VERSION);
g_writeln(" The xrdp session manager"); g_writeln(" The xrdp session manager");
g_writeln(" Copyright (C) 2004-2020 Jay Sorg, " g_writeln(" Copyright (C) 2004-2023 Jay Sorg, "
"Neutrino Labs, and all contributors."); "Neutrino Labs, and all contributors.");
g_writeln(" See https://github.com/neutrinolabs/xrdp for more information."); g_writeln(" See https://github.com/neutrinolabs/xrdp for more information.");
g_writeln("%s", ""); g_writeln("%s", "");
@ -715,16 +690,14 @@ main(int argc, char **argv)
enum logReturns log_error; enum logReturns log_error;
char text[256]; char text[256];
char pid_file[256]; char pid_file[256];
char default_sesman_ini[256];
struct sesman_startup_params startup_params = {0}; struct sesman_startup_params startup_params = {0};
int errored_argc; int errored_argc;
int daemon; int daemon;
g_init("xrdp-sesman"); g_init("xrdp-sesman");
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH); g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
g_snprintf(default_sesman_ini, 255, "%s/sesman.ini", XRDP_CFG_PATH);
startup_params.sesman_ini = default_sesman_ini; startup_params.sesman_ini = DEFAULT_SESMAN_INI;
errored_argc = sesman_process_params(argc, argv, &startup_params); errored_argc = sesman_process_params(argc, argv, &startup_params);
if (errored_argc > 0) if (errored_argc > 0)
@ -922,10 +895,11 @@ main(int argc, char **argv)
g_snprintf(text, 255, "xrdp_sesman_%8.8x_reload", g_pid); g_snprintf(text, 255, "xrdp_sesman_%8.8x_reload", g_pid);
g_reload_event = g_create_wait_obj(text); g_reload_event = g_create_wait_obj(text);
g_signal_hang_up(set_reload_event); /* SIGHUP */
g_signal_user_interrupt(set_term_event); /* SIGINT */ g_signal_user_interrupt(set_term_event); /* SIGINT */
g_signal_terminate(set_term_event); /* SIGTERM */ g_signal_terminate(set_term_event); /* SIGTERM */
g_signal_pipe(sig_no_op); /* SIGPIPE */
g_signal_child_stop(set_sigchld_event); /* SIGCHLD */ g_signal_child_stop(set_sigchld_event); /* SIGCHLD */
g_signal_hang_up(set_reload_event); /* SIGHUP */
if (daemon) if (daemon)
{ {
@ -967,11 +941,10 @@ main(int argc, char **argv)
g_chmod_hex("/tmp/.X11-unix", 0x1777); g_chmod_hex("/tmp/.X11-unix", 0x1777);
} }
error = session_module_init(); if ((error = pre_session_list_init(MAX_PRE_SESSION_ITEMS)) == 0 &&
if (error == 0) (error = session_list_init()) == 0)
{ {
error = sesman_main_loop(); error = sesman_main_loop();
session_module_cleanup();
} }
/* clean up PID file on exit */ /* clean up PID file on exit */
@ -980,12 +953,9 @@ main(int argc, char **argv)
g_file_delete(pid_file); g_file_delete(pid_file);
} }
sesman_delete_wait_objects(); sesman_close_all();
if (!daemon) log_end();
{
log_end();
}
config_free(g_cfg); config_free(g_cfg);
g_deinit(); g_deinit();

71
sesman/sesman.h
View File

@ -27,33 +27,11 @@
#ifndef SESMAN_H #ifndef SESMAN_H
#define SESMAN_H #define SESMAN_H
/** struct config_sesman;
* Type for managing sesman connections from xrdp (etc) struct trans;
*/
struct sesman_con
{
struct trans *t;
char peername[15 + 1]; /* Name of peer, if known, for logging */
int close_requested; /* Set to close the connection normally */
unsigned int auth_retry_count;
struct auth_info *auth_info; /* non-NULL for an authenticated connection */
int uid; /* User */
char *username; /* Username from UID (at time of logon) */
char *ip_addr; /* Connecting IP address */
};
/* Globals */ /* Globals */
extern struct config_sesman *g_cfg; extern struct config_sesman *g_cfg;
extern unsigned char g_fixedkey[8];
/**
* Set the peername of a connection
*
* @param name Name to set
* @result 0 for success
*/
int
sesman_set_connection_peername(struct sesman_con *sc, const char *name);
/** /**
* Close all file descriptors used by sesman. * Close all file descriptors used by sesman.
@ -61,24 +39,13 @@ sesman_set_connection_peername(struct sesman_con *sc, const char *name);
* This is generally used after forking, to make sure the * This is generally used after forking, to make sure the
* file descriptors used by the main process are not disturbed * file descriptors used by the main process are not disturbed
* *
* This call will also release all trans and SCP_SESSION objects * This call will also :-
* held by sesman * - release all trans objects held by sesman
* * - Delete sesman wait objects
* @param flags Set SCA_CLOSE_AUTH_INFO to close any open auth_info * - Call sesman_delete_listening_transport()
* objects. By default these are not cleared, and should
* only be done so when exiting sesman.
*/ */
#define SCA_CLOSE_AUTH_INFO (1<<0)
int int
sesman_close_all(unsigned int flags); sesman_close_all(void);
/**
* Delete sesman wait objects.
*
* Call after forking so we don't break sesman's wait objects
*/
void
sesman_delete_wait_objects(void);
/* /*
* Remove the listening transport * Remove the listening transport
@ -96,4 +63,28 @@ sesman_delete_listening_transport(void);
int int
sesman_create_listening_transport(const struct config_sesman *cfg); sesman_create_listening_transport(const struct config_sesman *cfg);
/**
* Callback to process incoming SCP data
*/
int
sesman_scp_data_in(struct trans *self);
/**
* Callback to process incoming EICP data
*/
int
sesman_eicp_data_in(struct trans *self);
/**
* Callback to process incoming ERCP data
*/
int
sesman_ercp_data_in(struct trans *self);
/*
* Check for termination
*/
int
sesman_is_term(void);
#endif #endif

188
sesman/session_list.c
View File

@ -33,11 +33,16 @@
#include "config_ac.h" #include "config_ac.h"
#endif #endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#include "arch.h" #include "arch.h"
#include "session_list.h" #include "session_list.h"
#include "trans.h"
#include "sesman_auth.h"
#include "sesman_config.h" #include "sesman_config.h"
#include "list.h"
#include "log.h" #include "log.h"
#include "os_calls.h" #include "os_calls.h"
#include "sesman.h" #include "sesman.h"
@ -48,12 +53,12 @@ static struct list *g_session_list = NULL;
#define SESSION_IN_USE(si) \ #define SESSION_IN_USE(si) \
((si) != NULL && \ ((si) != NULL && \
(si)->display >= 0 && \ (si)->sesexec_trans != NULL && \
(si)->pid > 0) (si)->sesexec_trans->status == TRANS_STATUS_UP)
/******************************************************************************/ /******************************************************************************/
int int
session_module_init(void) session_list_init(void)
{ {
int rv = 1; int rv = 1;
if (g_session_list == NULL) if (g_session_list == NULL)
@ -88,9 +93,9 @@ free_session(struct session_item *si)
{ {
if (si != NULL) if (si != NULL)
{ {
if (si->auth_info != NULL) if (si->sesexec_trans != NULL)
{ {
auth_end(si->auth_info); trans_delete(si->sesexec_trans);
} }
g_free(si); g_free(si);
} }
@ -98,7 +103,7 @@ free_session(struct session_item *si)
/******************************************************************************/ /******************************************************************************/
void void
session_module_cleanup(void) session_list_cleanup(void)
{ {
if (g_session_list != NULL) if (g_session_list != NULL)
{ {
@ -123,13 +128,12 @@ session_list_get_count(void)
/******************************************************************************/ /******************************************************************************/
struct session_item * struct session_item *
session_new(void) session_list_new(void)
{ {
struct session_item *result = g_new0(struct session_item, 1); struct session_item *result = g_new0(struct session_item, 1);
if (result != NULL) if (result != NULL)
{ {
result->pid = -1; result->state = E_SESSION_STARTING;
result->display = -1;
if (!list_add_item(g_session_list, (tintptr)result)) if (!list_add_item(g_session_list, (tintptr)result))
{ {
g_free(result); g_free(result);
@ -401,7 +405,7 @@ session_list_get_bydata(uid_t uid,
si, si,
SCP_SESSION_TYPE_TO_STR(si->type), SCP_SESSION_TYPE_TO_STR(si->type),
si->uid, si->bpp, si->uid, si->bpp,
si->width, si->height, si->start_width, si->start_height,
si->start_ip_addr); si->start_ip_addr);
if (si->type != type) if (si->type != type)
@ -410,7 +414,7 @@ session_list_get_bydata(uid_t uid,
continue; continue;
} }
if ((policy & SESMAN_CFG_SESS_POLICY_U) && (int)uid != si->uid) if ((policy & SESMAN_CFG_SESS_POLICY_U) && uid != si->uid)
{ {
LOG(LOG_LEVEL_DEBUG, LOG(LOG_LEVEL_DEBUG,
"%s: UID doesn't match for 'U' policy", __func__); "%s: UID doesn't match for 'U' policy", __func__);
@ -425,7 +429,8 @@ session_list_get_bydata(uid_t uid,
} }
if ((policy & SESMAN_CFG_SESS_POLICY_D) && if ((policy & SESMAN_CFG_SESS_POLICY_D) &&
(si->width != width || si->height != height)) (si->start_width != width ||
si->start_height != height))
{ {
LOG(LOG_LEVEL_DEBUG, LOG(LOG_LEVEL_DEBUG,
"%s: Dimensions don't match for 'D' policy", __func__); "%s: Dimensions don't match for 'D' policy", __func__);
@ -449,98 +454,9 @@ session_list_get_bydata(uid_t uid,
return NULL; return NULL;
} }
/******************************************************************************/
/**
* Convert a UID to a username
*
* @param uid UID
* @param uname pointer to output buffer
* @param uname_len Length of output buffer
* @return 0 for success.
*/
static int
username_from_uid(int uid, char *uname, int uname_len)
{
char *ustr;
int rv = g_getuser_info_by_uid(uid, &ustr, NULL, NULL, NULL, NULL);
if (rv == 0)
{
g_snprintf(uname, uname_len, "%s", ustr);
g_free(ustr);
}
else
{
g_snprintf(uname, uname_len, "<unknown>");
}
return rv;
}
/******************************************************************************/
enum session_kill_status
session_list_kill(int pid)
{
int i = 0;
enum session_kill_status status = SESMAN_SESSION_KILL_NOTFOUND;
while (i < g_session_list->count)
{
struct session_item *si;
si = (struct session_item *)list_get_item(g_session_list, i);
if (si->pid == pid)
{
status = SESMAN_SESSION_KILL_OK;
if (pid > 0)
{
char username[256];
username_from_uid(si->uid, username, sizeof(username));
/* Log the deletion */
if (si->auth_info != NULL)
{
LOG(LOG_LEVEL_INFO,
"Calling auth_end for pid %d from pid %d",
pid, g_getpid());
}
LOG(LOG_LEVEL_INFO,
"++ terminated session: UID %d (%s), display :%d.0, "
"session_pid %d, ip %s",
si->uid, username, si->display,
si->pid, si->start_ip_addr);
}
free_session(si);
}
else
{
++i;
}
}
return status;
}
/******************************************************************************/
void
session_list_sigkill_all(void)
{
int i;
for (i = 0 ; i < g_session_list->count ; ++i)
{
struct session_item *si;
si = (struct session_item *)list_get_item(g_session_list, i);
if (si->pid > 0)
{
g_sigterm(si->pid);
}
}
}
/******************************************************************************/ /******************************************************************************/
struct scp_session_info * struct scp_session_info *
session_list_get_byuid(int uid, unsigned int *cnt, unsigned char flags) session_list_get_byuid(uid_t uid, unsigned int *cnt, unsigned int flags)
{ {
int i; int i;
struct scp_session_info *sess; struct scp_session_info *sess;
@ -549,11 +465,13 @@ session_list_get_byuid(int uid, unsigned int *cnt, unsigned char flags)
count = 0; count = 0;
LOG(LOG_LEVEL_DEBUG, "searching for session by UID: %d", uid);
for (i = 0 ; i < g_session_list->count ; ++i) for (i = 0 ; i < g_session_list->count ; ++i)
{ {
const struct session_item *si; const struct session_item *si;
si = (const struct session_item *)list_get_item(g_session_list, i); si = (const struct session_item *)list_get_item(g_session_list, i);
if (SESSION_IN_USE(si) && uid == si->uid && (si->status & flags) != 0) if (SESSION_IN_USE(si) && uid == si->uid)
{ {
count++; count++;
} }
@ -579,13 +497,14 @@ session_list_get_byuid(int uid, unsigned int *cnt, unsigned char flags)
{ {
const struct session_item *si; const struct session_item *si;
si = (const struct session_item *)list_get_item(g_session_list, i); si = (const struct session_item *)list_get_item(g_session_list, i);
if (SESSION_IN_USE(si) && uid == si->uid && (si->status & flags) != 0)
if (SESSION_IN_USE(si) && uid == si->uid)
{ {
(sess[index]).sid = si->pid; (sess[index]).sid = si->sesexec_pid;
(sess[index]).display = si->display; (sess[index]).display = si->display;
(sess[index]).type = si->type; (sess[index]).type = si->type;
(sess[index]).height = si->height; (sess[index]).height = si->start_height;
(sess[index]).width = si->width; (sess[index]).width = si->start_width;
(sess[index]).bpp = si->bpp; (sess[index]).bpp = si->bpp;
(sess[index]).start_time = si->start_time; (sess[index]).start_time = si->start_time;
(sess[index]).uid = si->uid; (sess[index]).uid = si->uid;
@ -621,3 +540,56 @@ free_session_info_list(struct scp_session_info *sesslist, unsigned int cnt)
g_free(sesslist); g_free(sesslist);
} }
/******************************************************************************/
int
session_list_get_wait_objs(tbus robjs[], int *robjs_count)
{
int i;
for (i = 0 ; i < g_session_list->count; ++i)
{
const struct session_item *si;
si = (const struct session_item *)list_get_item(g_session_list, i);
if (SESSION_IN_USE(si))
{
robjs[(*robjs_count)++] = si->sesexec_trans->sck;
}
}
return 0;
}
/******************************************************************************/
int
session_list_check_wait_objs(void)
{
int i;
for (i = 0 ; i < g_session_list->count; ++i)
{
struct session_item *si;
si = (struct session_item *)list_get_item(g_session_list, i);
if (SESSION_IN_USE(si))
{
if (trans_check_wait_objs(si->sesexec_trans) != 0)
{
LOG(LOG_LEVEL_ERROR, "sesman_check_wait_objs: "
"trans_check_wait_objs failed, removing trans");
si->sesexec_trans->status = TRANS_STATUS_DOWN;
}
}
if (SESSION_IN_USE(si))
{
++i;
}
else
{
free_session(si);
list_remove_item(g_session_list, i);
}
}
return 0;
}

120
sesman/session_list.h
View File

@ -1,7 +1,7 @@
/** /**
* xrdp: A Remote Desktop Protocol server. * xrdp: A Remote Desktop Protocol server.
* *
* Copyright (C) Jay Sorg 2004-2013 * Copyright (C) Jay Sorg 2004-2023
* *
* Licensed under the Apache License, Version 2.0 (the "License"); * Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. * you may not use this file except in compliance with the License.
@ -28,53 +28,44 @@
#ifndef SESSION_LIST_H #ifndef SESSION_LIST_H
#define SESSION_LIST_H #define SESSION_LIST_H
#include <time.h> #include <sys/types.h>
#include "guid.h" #include "guid.h"
#include "scp_application_types.h" #include "scp_application_types.h"
#include "xrdp_constants.h" #include "xrdp_constants.h"
struct session_parameters; enum session_state
#define SESMAN_SESSION_STATUS_ACTIVE 0x01
#define SESMAN_SESSION_STATUS_IDLE 0x02
#define SESMAN_SESSION_STATUS_DISCONNECTED 0x04
/* future expansion
#define SESMAN_SESSION_STATUS_REMCONTROL 0x08
*/
#define SESMAN_SESSION_STATUS_ALL 0xFF
enum session_kill_status
{ {
SESMAN_SESSION_KILL_OK = 0, /**
SESMAN_SESSION_KILL_NOTFOUND * Session definition is little more than a sesexec process. We're
* waiting for more details of the session from sesexec */
E_SESSION_STARTING,
/** Session is fully active */
E_SESSION_RUNNING
}; };
struct scp_session_info;
/** /**
* Object describing a session * Object describing a session
*
* Unless otherwide noted, fields are only valid if
* the status is E_SESSION_RUNNING
*/ */
struct session_item struct session_item
{ {
int uid; /* UID of session */ enum session_state state;
int pid; /* pid of sesman waiting for wm to end */ struct trans *sesexec_trans; // trans for sesexec process. Always valid.
pid_t sesexec_pid; // pid for sesexec process. Always valid
/**
* May be valid if known when the session is starting, otherwise -1 */
int display; int display;
int width; uid_t uid;
int height;
int bpp;
struct auth_info *auth_info;
/* status info */
unsigned char status;
enum scp_session_type type; enum scp_session_type type;
unsigned short start_width;
/* time data */ unsigned short start_height;
time_t start_time; unsigned char bpp;
// struct session_date disconnect_time; // Currently unused
// struct session_date idle_time; // Currently unused
char start_ip_addr[MAX_PEER_ADDRSTRLEN];
struct guid guid; struct guid guid;
char start_ip_addr[MAX_PEER_ADDRSTRLEN];
time_t start_time;
}; };
/** /**
@ -84,13 +75,13 @@ struct session_item
* Errors are logged * Errors are logged
*/ */
int int
session_module_init(void); session_list_init(void);
/** /**
* Clean up the module on program exit * Clean up the module on program exit
*/ */
void void
session_module_cleanup(void); session_list_cleanup(void);
/** /**
* Returns the number of sessions currently active * Returns the number of sessions currently active
@ -100,24 +91,27 @@ unsigned int
session_list_get_count(void); session_list_get_count(void);
/** /**
* Allocates a new session * Allocates a new session on the list
* *
* The PID and display for the allocated session will be -1 and all other * state will be E_SESSION_STARTING. Other data must be filled in by
* fields will be blank * the caller as appropriate.
* *
* @return pointer to new session object or NULL for no memory * @return pointer to new session object or NULL for no memory
* *
* After allocating the session successfully, you must initialise the * After allocating the session, you must initialise the sesexec_trans field
* PID and display fields with valid numbers. * with a valid transport.
* *
* If you allocate a session and want to remove it due to other problems, * The session is removed by session_check_wait_objs() when the transport
* use session_kill_pid(-1); * goes down (or wasn't allocated in the first place).
*/ */
struct session_item * struct session_item *
session_new(void); session_list_new(void);
/** /**
* Get the next available display * Get the next available display
*
* The display isn't reserved until the caller has allocated a new session
* (with session_list_new()) and put the new display in it.
*/ */
int int
session_list_get_available_display(void); session_list_get_available_display(void);
@ -136,35 +130,18 @@ session_list_get_bydata(uid_t uid,
unsigned char bpp, unsigned char bpp,
const char *ip_addr); const char *ip_addr);
/**
*
* @brief kills a session
* @param pid the pid of the session to be killed
* @return
*
*/
enum session_kill_status
session_list_kill(int pid);
/**
*
* @brief sends sigkill to all sessions
* @return
*
*/
void
session_list_sigkill_all(void);
/** /**
* @brief retrieves session descriptions * @brief retrieves session descriptions
* @param UID the UID for the descriptions * @param uid the UID for the descriptions
* @param[out] cnt The number of sessions returned
* @param flags Future expansion
* @return A block of session descriptions * @return A block of session descriptions
* *
* Pass the return result to free_session_info_list() after use * Pass the return result to free_session_info_list() after use
* *
*/ */
struct scp_session_info * struct scp_session_info *
session_list_get_byuid(int uid, unsigned int *cnt, unsigned char flags); session_list_get_byuid(uid_t uid, unsigned int *cnt, unsigned int flags);
/** /**
* *
@ -175,4 +152,21 @@ session_list_get_byuid(int uid, unsigned int *cnt, unsigned char flags);
void void
free_session_info_list(struct scp_session_info *sesslist, unsigned int cnt); free_session_info_list(struct scp_session_info *sesslist, unsigned int cnt);
/**
* @brief Get the wait objs for the session list module
* @param @robjs Objects array to update
* @param robjs_count Elements in robjs (by reference)
* @return 0 for success
*/
int
session_list_get_wait_objs(tbus robjs[], int *robjs_count);
/**
* @brief Check the wait objs for the session list module
* @return 0 for success
*/
int
session_list_check_wait_objs(void);
#endif // SESSION_LIST_H #endif // SESSION_LIST_H

21
sesman/sig.c
View File

@ -95,24 +95,3 @@ sig_sesman_reload_cfg(void)
LOG(LOG_LEVEL_INFO, "configuration reloaded, log subsystem restarted"); LOG(LOG_LEVEL_INFO, "configuration reloaded, log subsystem restarted");
} }
/******************************************************************************/
void
sig_sesman_session_end(void)
{
int pid;
LOG(LOG_LEVEL_DEBUG, "receiving SIGCHLD");
do
{
pid = g_waitchild(NULL);
if (pid > 0)
{
LOG(LOG_LEVEL_INFO, "Process %d has exited", pid);
session_list_kill(pid);
}
}
while (pid > 0);
}

8
sesman/sig.h
View File

@ -35,12 +35,4 @@
void void
sig_sesman_reload_cfg(void); sig_sesman_reload_cfg(void);
/**
*
* @brief SIGCHLD handling code
*
*/
void
sig_sesman_session_end(void);
#endif #endif