diff options
Diffstat (limited to 'usr.bin/ssh/clientloop.c')
| -rw-r--r-- | usr.bin/ssh/clientloop.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/usr.bin/ssh/clientloop.c b/usr.bin/ssh/clientloop.c index 878c8c6aee0..548c16cdb58 100644 --- a/usr.bin/ssh/clientloop.c +++ b/usr.bin/ssh/clientloop.c @@ -1,4 +1,4 @@ -/* $OpenBSD: clientloop.c,v 1.273 2015/05/04 06:10:48 djm Exp $ */ +/* $OpenBSD: clientloop.c,v 1.274 2015/07/01 02:26:31 djm Exp $ */ /* * Author: Tatu Ylonen <ylo@cs.hut.fi> * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland @@ -155,7 +155,7 @@ static int connection_in; /* Connection to server (input). */ static int connection_out; /* Connection to server (output). */ static int need_rekeying; /* Set to non-zero if rekeying is requested. */ static int session_closed; /* In SSH2: login session closed. */ -static int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ +static u_int x11_refuse_time; /* If >0, refuse x11 opens after this time. */ static void client_init_dispatch(void); int session_ident = -1; @@ -290,7 +290,8 @@ client_x11_display_valid(const char *display) return 1; } -#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" +#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1" +#define X11_TIMEOUT_SLACK 60 void client_x11_get_proto(const char *display, const char *xauth_path, u_int trusted, u_int timeout, char **_proto, char **_data) @@ -303,7 +304,7 @@ client_x11_get_proto(const char *display, const char *xauth_path, int got_data = 0, generated = 0, do_unlink = 0, i; char *xauthdir, *xauthfile; struct stat st; - u_int now; + u_int now, x11_timeout_real; xauthdir = xauthfile = NULL; *_proto = proto; @@ -336,6 +337,15 @@ client_x11_get_proto(const char *display, const char *xauth_path, xauthdir = xmalloc(PATH_MAX); xauthfile = xmalloc(PATH_MAX); mktemp_proto(xauthdir, PATH_MAX); + /* + * The authentication cookie should briefly outlive + * ssh's willingness to forward X11 connections to + * avoid nasty fail-open behaviour in the X server. + */ + if (timeout >= UINT_MAX - X11_TIMEOUT_SLACK) + x11_timeout_real = UINT_MAX; + else + x11_timeout_real = timeout + X11_TIMEOUT_SLACK; if (mkdtemp(xauthdir) != NULL) { do_unlink = 1; snprintf(xauthfile, PATH_MAX, "%s/xauthfile", @@ -343,17 +353,20 @@ client_x11_get_proto(const char *display, const char *xauth_path, snprintf(cmd, sizeof(cmd), "%s -f %s generate %s " SSH_X11_PROTO " untrusted timeout %u 2>" _PATH_DEVNULL, - xauth_path, xauthfile, display, timeout); + xauth_path, xauthfile, display, + x11_timeout_real); debug2("x11_get_proto: %s", cmd); - if (system(cmd) == 0) - generated = 1; if (x11_refuse_time == 0) { now = monotime() + 1; if (UINT_MAX - timeout < now) x11_refuse_time = UINT_MAX; else x11_refuse_time = now + timeout; + channel_set_x11_refuse_time( + x11_refuse_time); } + if (system(cmd) == 0) + generated = 1; } } @@ -1877,7 +1890,7 @@ client_request_x11(const char *request_type, int rchan) "malicious server."); return NULL; } - if (x11_refuse_time != 0 && monotime() >= x11_refuse_time) { + if (x11_refuse_time != 0 && (u_int)monotime() >= x11_refuse_time) { verbose("Rejected X11 connection after ForwardX11Timeout " "expired"); return NULL; |