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sesman config: Add MaxDisplayNumber

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When allocating a display number, we should be aware that
IANA only allow TCP displays up to :63. This PR adds that restriction in
to sesman.ini as a default, to prevent us allocating unavailable TCP
ports.

By default TCP ports are not enabled for X servers, but users can easily
change this if they wish to access X displays directly over the network.

This restriction is in addition to the MaxSessions limit already present
in sesman.ini
This commit is contained in:
matt335672 2023-02-06 16:14:36 +00:00
parent 970d936106
commit 06580ec448
4 changed files with 33 additions and 0 deletions
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7
docs/man/sesman.ini.5.in
View File

@ -155,6 +155,13 @@ defaults to \fI10\fR.
Sets the maximum number of simultaneous sessions. If not set or set to
\fI0\fR, unlimited session are allowed.
.TP
\fBMaxDisplayNumber\fR=\fInumber\fR
Sets the maximum number which can be assigned to an X11 $DISPLAY. The
default is compatible with IANA TCP port allocations. If you are not
allowing TCP connections to your X servers you may safely increase this
number.
.TP
\fBKillDisconnected\fR=\fI[true|false]\fR
If set to \fB1\fR, \fBtrue\fR or \fByes\fR, every session will be killed

12
sesman/libsesman/sesman_config.c
View File

@ -77,6 +77,7 @@
#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"
@ -410,6 +411,8 @@ config_read_sessions(int file, struct config_sessions *se, struct list *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;
@ -428,6 +431,15 @@ config_read_sessions(int file, struct config_sessions *se, struct list *param_n,
se->x11_display_offset = g_atoi(value);
}
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))
{
se->max_sessions = g_atoi(value);

5
sesman/libsesman/sesman_config.h
View File

@ -118,6 +118,11 @@ struct config_sessions
* @brief X11 TCP port offset. default value: 10
*/
int x11_display_offset;
/**
* @var max_display_number
* @brief Highest X11 display number considered for allocation
*/
unsigned int max_display_number;
/**
* @var max_sessions
* @brief maximum number of allowed sessions. 0 for unlimited

9
sesman/sesman.ini.in
View File

@ -51,6 +51,15 @@ X11DisplayOffset=10
; Default: 0
MaxSessions=50
;; MaxDisplayNumer - maximum number considered for an X display
; Type: integer
; Default: 63
;
; IANA only allocates TCP ports up to 6063 for X servers. If you are not
; allowing TCP connections to your X servers you may safely increase this
; number.
#MaxDisplayNumber=63
;; KillDisconnected - kill disconnected sessions
; Type: boolean
; Default: false