diff options
Diffstat (limited to 'backport-openssh-7.3p1-x11-max-displays.patch')
| -rw-r--r-- | backport-openssh-7.3p1-x11-max-displays.patch | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/backport-openssh-7.3p1-x11-max-displays.patch b/backport-openssh-7.3p1-x11-max-displays.patch new file mode 100644 index 0000000..526289f --- /dev/null +++ b/backport-openssh-7.3p1-x11-max-displays.patch @@ -0,0 +1,219 @@ +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 +Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.3p1-x11-max-displays.patch +@@ -152,8 +152,8 @@ static int all_opens_permitted = 0; + #define FWD_PERMIT_ANY_HOST "*" + + /* -- 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 select() 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 +Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.3p1-x11-max-displays.patch +@@ -293,7 +293,7 @@ int permitopen_port(const char *); + + void channel_set_x11_refuse_time(struct ssh *, u_int); + 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 +Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.3p1-x11-max-displays.patch +@@ -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 { + 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 +Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.3p1-x11-max-displays.patch +@@ -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 +Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.3p1-x11-max-displays.patch +@@ -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 +Reference:https://src.fedoraproject.org/rpms/openssh/blob/rawhide/f/backport-openssh-7.3p1-x11-max-displays.patch +@@ -1133,6 +1133,7 @@ Available keywords are + .Cm StreamLocalBindUnlink , + .Cm TrustedUserCAKeys , + .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 |