[#include <arpa/nameser.h>])
])
+# Check whether user wants SELinux support
+SELINUX_MSG="no"
+LIBSELINUX=""
+AC_ARG_WITH(selinux,
+ [ --with-selinux Enable SELinux support],
+ [ if test "x$withval" != "xno" ; then
+ AC_DEFINE(WITH_SELINUX,1,[Define if you want SELinux support.])
+ SELINUX_MSG="yes"
+ AC_CHECK_HEADER([selinux/selinux.h], ,
+ AC_MSG_ERROR(SELinux support requires selinux.h header))
+ AC_CHECK_LIB(selinux, setexeccon, [ LIBSELINUX="-lselinux" ],
+ AC_MSG_ERROR(SELinux support requires libselinux library))
+ AC_CHECK_FUNCS(getseuserbyname get_default_context_with_level)
+ fi ]
+)
+AC_SUBST(LIBSELINUX)
+
# Check whether user wants Kerberos 5 support
KRB5_MSG="no"
AC_ARG_WITH(kerberos5,
echo " Manpage format: $MANTYPE"
echo " PAM support: $PAM_MSG"
echo " KerberosV support: $KRB5_MSG"
+echo " SELinux support: $SELINUX_MSG"
echo " Smartcard support: $SCARD_MSG"
echo " S/KEY support: $SKEY_MSG"
echo " TCP Wrappers support: $TCPW_MSG"
--- /dev/null
+/* $Id$ */
+
+/*
+ * 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 */
--- /dev/null
+/* $Id$ */
+
+/*
+ * 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 */
andersk / openssh.git / commitdiff
