- (djm) [Makefile.in configure.ac session.c sshpty.c]

   [contrib/redhat/sshd.init openbsd-compat/Makefile.in]
   [openbsd-compat/openbsd-compat.h openbsd-compat/port-linux.c]
   [openbsd-compat/port-linux.h] Add support for SELinux, setting
   the execution and TTY contexts. based on patch from Daniel Walsh,
   bz #880; ok dtucker@

4 files changed, 196 insertions, 3 deletions

diff --git a/openbsd-compat/Makefile.in b/openbsd-compat/Makefile.in
index f1a70624..67e521bf 100644
--- a/openbsd-compat/Makefile.in
+++ b/openbsd-compat/Makefile.in
@@ -1,4 +1,4 @@
-# $Id: Makefile.in,v 1.38 2006/03/15 02:09:20 djm Exp $
+# $Id: Makefile.in,v 1.39 2006/04/22 11:26:08 djm Exp $
 
 sysconfdir=@sysconfdir@
 piddir=@piddir@
@@ -20,7 +20,7 @@ OPENBSD=base64.o basename.o bindresvport.o daemon.o dirname.o getcwd.o getgroupl
 
 COMPAT=bsd-arc4random.o bsd-asprintf.o bsd-closefrom.o bsd-cray.o bsd-cygwin_util.o bsd-getpeereid.o bsd-misc.o bsd-nextstep.o bsd-openpty.o bsd-snprintf.o bsd-waitpid.o fake-rfc2553.o openssl-compat.o xmmap.o xcrypt.o
 
-PORTS=port-irix.o port-aix.o port-uw.o port-tun.o
+PORTS=port-irix.o port-linux.o port-aix.o port-uw.o port-tun.o
 
 .c.o:
 	$(CC) $(CFLAGS) $(CPPFLAGS) -c $<
diff --git a/openbsd-compat/openbsd-compat.h b/openbsd-compat/openbsd-compat.h
index 432b183e..eda9c49e 100644
--- a/openbsd-compat/openbsd-compat.h
+++ b/openbsd-compat/openbsd-compat.h
@@ -1,4 +1,4 @@
-/* $Id: openbsd-compat.h,v 1.35 2006/03/15 11:25:55 dtucker Exp $ */
+/* $Id: openbsd-compat.h,v 1.36 2006/04/22 11:26:08 djm Exp $ */
 
 /*
  * Copyright (c) 1999-2003 Damien Miller.  All rights reserved.
@@ -185,6 +185,7 @@ char *shadow_pw(struct passwd *pw);
 #include "bsd-cray.h"
 #include "bsd-cygwin_util.h"
 #include "port-irix.h"
+#include "port-linux.h"
 #include "port-aix.h"
 #include "port-uw.h"
 #include "port-tun.h"
diff --git a/openbsd-compat/port-linux.c b/openbsd-compat/port-linux.c
new file mode 100644
index 00000000..54ec2910
--- /dev/null
+++ b/openbsd-compat/port-linux.c
@@ -0,0 +1,165 @@
+/* $Id: port-linux.c,v 1.1 2006/04/22 11:26:08 djm Exp $ */
+
+/*
+ * Copyright (c) 2005 Daniel Walsh <dwalsh@redhat.com>
+ * Copyright (c) 2006 Damien Miller <djm@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * Linux-specific portability code - just SELinux support at present
+ */
+
+#include "includes.h"
+
+#ifdef WITH_SELINUX
+#include "log.h"
+#include "port-linux.h"
+
+#include <selinux/selinux.h>
+#include <selinux/flask.h>
+#include <selinux/get_context_list.h>
+
+/* Wrapper around is_selinux_enabled() to log its return value once only */
+static int
+ssh_selinux_enabled(void)
+{
+	static int enabled = -1;
+
+	if (enabled == -1) {
+		enabled = is_selinux_enabled();
+		debug("SELinux support %s", enabled ? "enabled" : "disabled");
+	}
+
+	return (enabled);
+}
+
+/* Return the default security context for the given username */
+static security_context_t
+ssh_selinux_getctxbyname(char *pwname)
+{
+	security_context_t sc;
+	char *sename = NULL, *lvl = NULL;
+	int r;
+
+#ifdef HAVE_GETSEUSERBYNAME
+	if (getseuserbyname(pwname, &sename, &lvl) != 0)
+		return NULL;
+#else
+	sename = pwname;
+	lvl = NULL;
+#endif
+
+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL
+	r = get_default_context_with_level(sename, lvl, NULL, &sc);
+#else
+	r = get_default_context(sename, NULL, &sc);
+#endif
+
+	if (r != 0) {
+		switch (security_getenforce()) {
+		case -1:
+			fatal("%s: ssh_selinux_getctxbyname: "
+			    "security_getenforce() failed", __func__);
+		case 0:
+			error("%s: Failed to get default SELinux security "
+			    "context for %s", __func__, pwname);
+		default:
+			fatal("%s: Failed to get default SELinux security "
+			    "context for %s (in enforcing mode)",
+			    __func__, pwname);
+		}
+	}
+
+#ifdef HAVE_GETSEUSERBYNAME
+	if (sename != NULL)
+		xfree(sename);
+	if (lvl != NULL)
+		xfree(lvl);
+#endif
+
+	return (sc);
+}
+
+/* Set the execution context to the default for the specified user */
+void
+ssh_selinux_setup_exec_context(char *pwname)
+{
+	security_context_t user_ctx = NULL;
+
+	if (!ssh_selinux_enabled())
+		return;
+
+	debug3("%s: setting execution context", __func__);
+
+	user_ctx = ssh_selinux_getctxbyname(pwname);
+	if (setexeccon(user_ctx) != 0) {
+		switch (security_getenforce()) {
+		case -1:
+			fatal("%s: security_getenforce() failed", __func__);
+		case 0:
+			error("%s: Failed to set SELinux execution "
+			    "context for %s", __func__, pwname);
+		default:
+			fatal("%s: Failed to set SELinux execution context "
+			    "for %s (in enforcing mode)", __func__, pwname);
+		}
+	}
+	if (user_ctx != NULL)
+		freecon(user_ctx);
+
+	debug3("%s: done", __func__);
+}
+
+/* Set the TTY context for the specified user */
+void
+ssh_selinux_setup_pty(char *pwname, const char *tty)
+{
+	security_context_t new_tty_ctx = NULL;
+	security_context_t user_ctx = NULL;
+	security_context_t old_tty_ctx = NULL;
+
+	if (!ssh_selinux_enabled())
+		return;
+
+	debug3("%s: setting TTY context on %s", __func__, tty);
+
+	user_ctx = ssh_selinux_getctxbyname(pwname);
+
+	/* XXX: should these calls fatal() upon failure in enforcing mode? */
+
+	if (getfilecon(tty, &old_tty_ctx) == -1) {
+		error("%s: getfilecon: %s", __func__, strerror(errno));
+		goto out;
+	}
+
+	if (security_compute_relabel(user_ctx, old_tty_ctx,
+	    SECCLASS_CHR_FILE, &new_tty_ctx) != 0) {
+		error("%s: security_compute_relabel: %s",
+		    __func__, strerror(errno));
+		goto out;
+	}
+
+	if (setfilecon(tty, new_tty_ctx) != 0)
+		error("%s: setfilecon: %s", __func__, strerror(errno));
+ out:
+	if (new_tty_ctx != NULL)
+		freecon(new_tty_ctx);
+	if (old_tty_ctx != NULL)
+		freecon(old_tty_ctx);
+	if (user_ctx != NULL)
+		freecon(user_ctx);
+	debug3("%s: done", __func__);
+}
+#endif /* WITH_SELINUX */
diff --git a/openbsd-compat/port-linux.h b/openbsd-compat/port-linux.h
new file mode 100644
index 00000000..05e520e1
--- /dev/null
+++ b/openbsd-compat/port-linux.h
@@ -0,0 +1,27 @@
+/* $Id: port-linux.h,v 1.1 2006/04/22 11:26:08 djm Exp $ */
+
+/*
+ * Copyright (c) 2006 Damien Miller <djm@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _PORT_LINUX_H
+#define _PORT_LINUX_H
+
+#ifdef WITH_SELINUX
+void ssh_selinux_setup_pty(char *, const char *);
+void ssh_selinux_setup_exec_context(char *);
+#endif
+
+#endif /* ! _PORT_LINUX_H */