You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
214 lines
8.6 KiB
214 lines
8.6 KiB
3 weeks ago
|
diff -up openssh-7.4p1/channels.c.x11max openssh-7.4p1/channels.c
|
||
|
|
--- openssh-7.4p1/channels.c.x11max 2016-12-23 15:46:32.071506625 +0100
|
||
|
|
+++ openssh-7.4p1/channels.c 2016-12-23 15:46:32.139506636 +0100
|
||
|
|
@@ -152,8 +152,8 @@ static int all_opens_permitted = 0;
|
||
|
|
#define NUM_SOCKS 10
|
||
|
|
|
||
|
|
/* -- X11 forwarding */
|
||
|
|
-/* Maximum number of fake X11 displays to try. */
|
||
|
|
-#define MAX_DISPLAYS 1000
|
||
|
|
+/* Minimum port number for X11 forwarding */
|
||
|
|
+#define X11_PORT_MIN 6000
|
||
|
|
|
||
|
|
/* Per-channel callback for pre/post IO actions */
|
||
|
|
typedef void chan_fn(struct ssh *, Channel *c);
|
||
|
|
@@ -4228,7 +4228,7 @@ channel_send_window_changes(void)
|
||
|
|
*/
|
||
|
|
int
|
||
|
|
x11_create_display_inet(struct ssh *ssh, int x11_display_offset,
|
||
|
|
- int x11_use_localhost, int single_connection,
|
||
|
|
+ int x11_use_localhost, int x11_max_displays, int single_connection,
|
||
|
|
u_int *display_numberp, int **chanids)
|
||
|
|
{
|
||
|
|
Channel *nc = NULL;
|
||
|
|
@@ -4240,10 +4241,15 @@ x11_create_display_inet(int x11_display_
|
||
|
|
if (chanids == NULL)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
+ /* Try to bind ports starting at 6000+X11DisplayOffset */
|
||
|
|
+ x11_max_displays = x11_max_displays + x11_display_offset;
|
||
|
|
+
|
||
|
|
for (display_number = x11_display_offset;
|
||
|
|
- display_number < MAX_DISPLAYS;
|
||
|
|
+ display_number < x11_max_displays;
|
||
|
|
display_number++) {
|
||
|
|
- port = 6000 + display_number;
|
||
|
|
+ port = X11_PORT_MIN + display_number;
|
||
|
|
+ if (port < X11_PORT_MIN) /* overflow */
|
||
|
|
+ break;
|
||
|
|
memset(&hints, 0, sizeof(hints));
|
||
|
|
hints.ai_family = ssh->chanctxt->IPv4or6;
|
||
|
|
hints.ai_flags = x11_use_localhost ? 0: AI_PASSIVE;
|
||
|
|
@@ -4295,7 +4301,7 @@ x11_create_display_inet(int x11_display_
|
||
|
|
if (num_socks > 0)
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
- if (display_number >= MAX_DISPLAYS) {
|
||
|
|
+ if (display_number >= x11_max_displays || port < X11_PORT_MIN ) {
|
||
|
|
error("Failed to allocate internet-domain X11 display socket.");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
@@ -4441,7 +4447,7 @@ x11_connect_display(void)
|
||
|
|
memset(&hints, 0, sizeof(hints));
|
||
|
|
hints.ai_family = ssh->chanctxt->IPv4or6;
|
||
|
|
hints.ai_socktype = SOCK_STREAM;
|
||
|
|
- snprintf(strport, sizeof strport, "%u", 6000 + display_number);
|
||
|
|
+ snprintf(strport, sizeof strport, "%u", X11_PORT_MIN + display_number);
|
||
|
|
if ((gaierr = getaddrinfo(buf, strport, &hints, &aitop)) != 0) {
|
||
|
|
error("%.100s: unknown host. (%s)", buf,
|
||
|
|
ssh_gai_strerror(gaierr));
|
||
|
|
@@ -4457,7 +4463,7 @@ x11_connect_display(void)
|
||
|
|
/* Connect it to the display. */
|
||
|
|
if (connect(sock, ai->ai_addr, ai->ai_addrlen) == -1) {
|
||
|
|
debug2("connect %.100s port %u: %.100s", buf,
|
||
|
|
- 6000 + display_number, strerror(errno));
|
||
|
|
+ X11_PORT_MIN + display_number, strerror(errno));
|
||
|
|
close(sock);
|
||
|
|
continue;
|
||
|
|
}
|
||
|
|
@@ -4466,8 +4472,8 @@ x11_connect_display(void)
|
||
|
|
}
|
||
|
|
freeaddrinfo(aitop);
|
||
|
|
if (!ai) {
|
||
|
|
- error("connect %.100s port %u: %.100s", buf,
|
||
|
|
- 6000 + display_number, strerror(errno));
|
||
|
|
+ error("connect %.100s port %u: %.100s", buf,
|
||
|
|
+ X11_PORT_MIN + display_number, strerror(errno));
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
set_nodelay(sock);
|
||
|
|
diff -up openssh-7.4p1/channels.h.x11max openssh-7.4p1/channels.h
|
||
|
|
--- openssh-7.4p1/channels.h.x11max 2016-12-19 05:59:41.000000000 +0100
|
||
|
|
+++ openssh-7.4p1/channels.h 2016-12-23 15:46:32.139506636 +0100
|
||
|
|
@@ -293,7 +293,7 @@ int permitopen_port(const char *);
|
||
|
|
|
||
|
|
void channel_set_x11_refuse_time(struct ssh *, time_t);
|
||
|
|
int x11_connect_display(struct ssh *);
|
||
|
|
-int x11_create_display_inet(struct ssh *, int, int, int, u_int *, int **);
|
||
|
|
+int x11_create_display_inet(struct ssh *, int, int, int, int, u_int *, int **);
|
||
|
|
void x11_request_forwarding_with_spoofing(struct ssh *, int,
|
||
|
|
const char *, const char *, const char *, int);
|
||
|
|
|
||
|
|
diff -up openssh-7.4p1/servconf.c.x11max openssh-7.4p1/servconf.c
|
||
|
|
--- openssh-7.4p1/servconf.c.x11max 2016-12-23 15:46:32.133506635 +0100
|
||
|
|
+++ openssh-7.4p1/servconf.c 2016-12-23 15:47:27.320519121 +0100
|
||
|
|
@@ -95,6 +95,7 @@ initialize_server_options(ServerOptions
|
||
|
|
options->print_lastlog = -1;
|
||
|
|
options->x11_forwarding = -1;
|
||
|
|
options->x11_display_offset = -1;
|
||
|
|
+ options->x11_max_displays = -1;
|
||
|
|
options->x11_use_localhost = -1;
|
||
|
|
options->permit_tty = -1;
|
||
|
|
options->permit_user_rc = -1;
|
||
|
|
@@ -243,6 +244,8 @@ fill_default_server_options(ServerOption
|
||
|
|
options->x11_forwarding = 0;
|
||
|
|
if (options->x11_display_offset == -1)
|
||
|
|
options->x11_display_offset = 10;
|
||
|
|
+ if (options->x11_max_displays == -1)
|
||
|
|
+ options->x11_max_displays = DEFAULT_MAX_DISPLAYS;
|
||
|
|
if (options->x11_use_localhost == -1)
|
||
|
|
options->x11_use_localhost = 1;
|
||
|
|
if (options->xauth_location == NULL)
|
||
|
|
@@ -419,7 +422,7 @@ typedef enum {
|
||
|
|
sKerberosGetAFSToken, sKerberosUniqueCCache, sKerberosUseKuserok, sPasswordAuthentication,
|
||
|
|
sKbdInteractiveAuthentication, sListenAddress, sAddressFamily,
|
||
|
|
sPrintMotd, sPrintLastLog, sIgnoreRhosts,
|
||
|
|
- sX11Forwarding, sX11DisplayOffset, sX11UseLocalhost,
|
||
|
|
+ sX11Forwarding, sX11DisplayOffset, sX11MaxDisplays, sX11UseLocalhost,
|
||
|
|
sPermitTTY, sStrictModes, sEmptyPasswd, sTCPKeepAlive,
|
||
|
|
sPermitUserEnvironment, sAllowTcpForwarding, sCompression,
|
||
|
|
sRekeyLimit, sAllowUsers, sDenyUsers, sAllowGroups, sDenyGroups,
|
||
|
|
@@ -540,6 +543,7 @@ static struct {
|
||
|
|
{ "ignoreuserknownhosts", sIgnoreUserKnownHosts, SSHCFG_GLOBAL },
|
||
|
|
{ "x11forwarding", sX11Forwarding, SSHCFG_ALL },
|
||
|
|
{ "x11displayoffset", sX11DisplayOffset, SSHCFG_ALL },
|
||
|
|
+ { "x11maxdisplays", sX11MaxDisplays, SSHCFG_ALL },
|
||
|
|
{ "x11uselocalhost", sX11UseLocalhost, SSHCFG_ALL },
|
||
|
|
{ "xauthlocation", sXAuthLocation, SSHCFG_GLOBAL },
|
||
|
|
{ "strictmodes", sStrictModes, SSHCFG_GLOBAL },
|
||
|
|
@@ -1316,6 +1320,10 @@ process_server_config_line(ServerOptions
|
||
|
|
*intptr = value;
|
||
|
|
break;
|
||
|
|
|
||
|
|
+ case sX11MaxDisplays:
|
||
|
|
+ intptr = &options->x11_max_displays;
|
||
|
|
+ goto parse_int;
|
||
|
|
+
|
||
|
|
case sX11UseLocalhost:
|
||
|
|
intptr = &options->x11_use_localhost;
|
||
|
|
goto parse_flag;
|
||
|
|
@@ -2063,6 +2071,7 @@ copy_set_server_options(ServerOptions *d
|
||
|
|
M_CP_INTOPT(fwd_opts.streamlocal_bind_unlink);
|
||
|
|
M_CP_INTOPT(x11_display_offset);
|
||
|
|
M_CP_INTOPT(x11_forwarding);
|
||
|
|
+ M_CP_INTOPT(x11_max_displays);
|
||
|
|
M_CP_INTOPT(x11_use_localhost);
|
||
|
|
M_CP_INTOPT(permit_tty);
|
||
|
|
M_CP_INTOPT(permit_user_rc);
|
||
|
|
@@ -2315,6 +2324,7 @@ dump_config(ServerOptions *o)
|
||
|
|
#endif
|
||
|
|
dump_cfg_int(sLoginGraceTime, o->login_grace_time);
|
||
|
|
dump_cfg_int(sX11DisplayOffset, o->x11_display_offset);
|
||
|
|
+ dump_cfg_int(sX11MaxDisplays, o->x11_max_displays);
|
||
|
|
dump_cfg_int(sMaxAuthTries, o->max_authtries);
|
||
|
|
dump_cfg_int(sMaxSessions, o->max_sessions);
|
||
|
|
dump_cfg_int(sClientAliveInterval, o->client_alive_interval);
|
||
|
|
diff -up openssh-7.4p1/servconf.h.x11max openssh-7.4p1/servconf.h
|
||
|
|
--- openssh-7.4p1/servconf.h.x11max 2016-12-23 15:46:32.133506635 +0100
|
||
|
|
+++ openssh-7.4p1/servconf.h 2016-12-23 15:46:32.140506636 +0100
|
||
|
|
@@ -55,6 +55,7 @@
|
||
|
|
|
||
|
|
#define DEFAULT_AUTH_FAIL_MAX 6 /* Default for MaxAuthTries */
|
||
|
|
#define DEFAULT_SESSIONS_MAX 10 /* Default for MaxSessions */
|
||
|
|
+#define DEFAULT_MAX_DISPLAYS 1000 /* Maximum number of fake X11 displays to try. */
|
||
|
|
|
||
|
|
/* Magic name for internal sftp-server */
|
||
|
|
#define INTERNAL_SFTP_NAME "internal-sftp"
|
||
|
|
@@ -85,6 +86,7 @@ typedef struct {
|
||
|
|
int x11_forwarding; /* If true, permit inet (spoofing) X11 fwd. */
|
||
|
|
int x11_display_offset; /* What DISPLAY number to start
|
||
|
|
* searching at */
|
||
|
|
+ int x11_max_displays; /* Number of displays to search */
|
||
|
|
int x11_use_localhost; /* If true, use localhost for fake X11 server. */
|
||
|
|
char *xauth_location; /* Location of xauth program */
|
||
|
|
int permit_tty; /* If false, deny pty allocation */
|
||
|
|
diff -up openssh-7.4p1/session.c.x11max openssh-7.4p1/session.c
|
||
|
|
--- openssh-7.4p1/session.c.x11max 2016-12-23 15:46:32.136506636 +0100
|
||
|
|
+++ openssh-7.4p1/session.c 2016-12-23 15:46:32.141506636 +0100
|
||
|
|
@@ -2518,8 +2518,9 @@ session_setup_x11fwd(Session *s)
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
if (x11_create_display_inet(ssh, options.x11_display_offset,
|
||
|
|
- options.x11_use_localhost, s->single_connection,
|
||
|
|
- &s->display_number, &s->x11_chanids) == -1) {
|
||
|
|
+ options.x11_use_localhost, options.x11_max_displays,
|
||
|
|
+ s->single_connection, &s->display_number,
|
||
|
|
+ &s->x11_chanids) == -1) {
|
||
|
|
debug("x11_create_display_inet failed.");
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
diff -up openssh-7.4p1/sshd_config.5.x11max openssh-7.4p1/sshd_config.5
|
||
|
|
--- openssh-7.4p1/sshd_config.5.x11max 2016-12-23 15:46:32.134506635 +0100
|
||
|
|
+++ openssh-7.4p1/sshd_config.5 2016-12-23 15:46:32.141506636 +0100
|
||
|
|
@@ -1133,6 +1133,7 @@ Available keywords are
|
||
|
|
.Cm TrustedUserCAKeys ,
|
||
|
|
.Cm UnusedConnectionTimeout ,
|
||
|
|
.Cm X11DisplayOffset ,
|
||
|
|
+.Cm X11MaxDisplays ,
|
||
|
|
.Cm X11Forwarding
|
||
|
|
and
|
||
|
|
.Cm X11UseLocalhost .
|
||
|
|
@@ -1566,6 +1567,12 @@ Specifies the first display number avail
|
||
|
|
X11 forwarding.
|
||
|
|
This prevents sshd from interfering with real X11 servers.
|
||
|
|
The default is 10.
|
||
|
|
+.It Cm X11MaxDisplays
|
||
|
|
+Specifies the maximum number of displays available for
|
||
|
|
+.Xr sshd 8 Ns 's
|
||
|
|
+X11 forwarding.
|
||
|
|
+This prevents sshd from exhausting local ports.
|
||
|
|
+The default is 1000.
|
||
|
|
.It Cm X11Forwarding
|
||
|
|
Specifies whether X11 forwarding is permitted.
|
||
|
|
The argument must be
|