diff -up openssh/auth2.c.role-mls openssh/auth2.c

--- openssh/auth2.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/auth2.c	2018-08-22 11:14:56.815430916 +0200

@@ -256,6 +256,9 @@ input_userauth_request(int type, u_int32

 	Authctxt *authctxt = ssh->authctxt;

 	Authmethod *m = NULL;

 	char *user = NULL, *service = NULL, *method = NULL, *style = NULL;

+#ifdef WITH_SELINUX

+	char *role = NULL;

+#endif

 	int r, authenticated = 0;

 	double tstart = monotime_double();

@@ -268,6 +271,11 @@ input_userauth_request(int type, u_int32

 	debug("userauth-request for user %s service %s method %s", user, service, method);

 	debug("attempt %d failures %d", authctxt->attempt, authctxt->failures);

+#ifdef WITH_SELINUX

+	if ((role = strchr(user, '/')) != NULL)

+		*role++ = 0;

+#endif

+

 	if ((style = strchr(user, ':')) != NULL)

 		*style++ = 0;

@@ -296,8 +304,15 @@ input_userauth_request(int type, u_int32

 		    use_privsep ? " [net]" : "");

 		authctxt->service = xstrdup(service);

 		authctxt->style = style ? xstrdup(style) : NULL;

-		if (use_privsep)

+#ifdef WITH_SELINUX

+		authctxt->role = role ? xstrdup(role) : NULL;

+#endif

+		if (use_privsep) {

 			mm_inform_authserv(service, style);

+#ifdef WITH_SELINUX

+			mm_inform_authrole(role);

+#endif

+		}

 		userauth_banner(ssh);

 		if (auth2_setup_methods_lists(authctxt) != 0)

 			ssh_packet_disconnect(ssh,

diff -up openssh/auth2-gss.c.role-mls openssh/auth2-gss.c

--- openssh/auth2-gss.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/auth2-gss.c	2018-08-22 11:15:42.459799171 +0200

@@ -281,6 +281,7 @@ input_gssapi_mic(int type, u_int32_t ple

 	Authctxt *authctxt = ssh->authctxt;

 	Gssctxt *gssctxt;

 	int r, authenticated = 0;

+	char *micuser;

 	struct sshbuf *b;

 	gss_buffer_desc mic, gssbuf;

 	const char *displayname;

@@ -298,7 +299,13 @@ input_gssapi_mic(int type, u_int32_t ple

 		fatal_f("sshbuf_new failed");

 	mic.value = p;

 	mic.length = len;

-	ssh_gssapi_buildmic(b, authctxt->user, authctxt->service,

+#ifdef WITH_SELINUX

+	if (authctxt->role && authctxt->role[0] != 0)

+		xasprintf(&micuser, "%s/%s", authctxt->user, authctxt->role);

+	else

+#endif

+		micuser = authctxt->user;

+	ssh_gssapi_buildmic(b, micuser, authctxt->service,

 	    "gssapi-with-mic", ssh->kex->session_id);

 	if ((gssbuf.value = sshbuf_mutable_ptr(b)) == NULL)

@@ -311,6 +318,8 @@ input_gssapi_mic(int type, u_int32_t ple

 		logit("GSSAPI MIC check failed");

 	sshbuf_free(b);

+	if (micuser != authctxt->user)

+		free(micuser);

 	free(mic.value);

 	if ((!use_privsep || mm_is_monitor()) &&

diff -up openssh/auth2-hostbased.c.role-mls openssh/auth2-hostbased.c

--- openssh/auth2-hostbased.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/auth2-hostbased.c	2018-08-22 11:14:56.816430924 +0200

@@ -123,7 +123,16 @@ userauth_hostbased(struct ssh *ssh)

 	/* reconstruct packet */

 	if ((r = sshbuf_put_stringb(b, ssh->kex->session_id)) != 0 ||

 	    (r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||

+#ifdef WITH_SELINUX

+	    (authctxt->role

+	    ? ( (r = sshbuf_put_u32(b, strlen(authctxt->user)+strlen(authctxt->role)+1)) != 0 ||

+	        (r = sshbuf_put(b, authctxt->user, strlen(authctxt->user))) != 0 ||

+	        (r = sshbuf_put_u8(b, '/') != 0) ||

+	        (r = sshbuf_put(b, authctxt->role, strlen(authctxt->role))) != 0)

+	    : (r = sshbuf_put_cstring(b, authctxt->user)) != 0) ||

+#else

 	    (r = sshbuf_put_cstring(b, authctxt->user)) != 0 ||

+#endif

 	    (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||

 	    (r = sshbuf_put_cstring(b, "hostbased")) != 0 ||

 	    (r = sshbuf_put_string(b, pkalg, alen)) != 0 ||

diff -up openssh/auth2-pubkey.c.role-mls openssh/auth2-pubkey.c

--- openssh/auth2-pubkey.c.role-mls	2018-08-22 11:14:56.816430924 +0200

+++ openssh/auth2-pubkey.c	2018-08-22 11:17:07.331483958 +0200

@@ -169,9 +169,16 @@ userauth_pubkey(struct ssh *ssh)

 			goto done;

 		}

 		/* reconstruct packet */

-		xasprintf(&userstyle, "%s%s%s", authctxt->user,

+		xasprintf(&userstyle, "%s%s%s%s%s", authctxt->user,

 		    authctxt->style ? ":" : "",

-		    authctxt->style ? authctxt->style : "");

+		    authctxt->style ? authctxt->style : "",

+#ifdef WITH_SELINUX

+		    authctxt->role ? "/" : "",

+		    authctxt->role ? authctxt->role : ""

+#else

+		    "", ""

+#endif

+		    );

 		if ((r = sshbuf_put_u8(b, SSH2_MSG_USERAUTH_REQUEST)) != 0 ||

 		    (r = sshbuf_put_cstring(b, userstyle)) != 0 ||

 		    (r = sshbuf_put_cstring(b, authctxt->service)) != 0 ||

diff -up openssh/auth.h.role-mls openssh/auth.h

--- openssh/auth.h.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/auth.h	2018-08-22 11:14:56.816430924 +0200

@@ -65,6 +65,9 @@ struct Authctxt {

 	char		*service;

 	struct passwd	*pw;		/* set if 'valid' */

 	char		*style;

+#ifdef WITH_SELINUX

+	char		*role;

+#endif

 	/* Method lists for multiple authentication */

 	char		**auth_methods;	/* modified from server config */

diff -up openssh/auth-pam.c.role-mls openssh/auth-pam.c

--- openssh/auth-pam.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/auth-pam.c	2018-08-22 11:14:56.816430924 +0200

@@ -1172,7 +1172,7 @@ is_pam_session_open(void)

  * during the ssh authentication process.

  */

 int

-do_pam_putenv(char *name, char *value)

+do_pam_putenv(char *name, const char *value)

 {

 	int ret = 1;

 	char *compound;

diff -up openssh/auth-pam.h.role-mls openssh/auth-pam.h

--- openssh/auth-pam.h.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/auth-pam.h	2018-08-22 11:14:56.817430932 +0200

@@ -33,7 +33,7 @@ u_int do_pam_account(void);

 void do_pam_session(struct ssh *);

 void do_pam_setcred(int );

 void do_pam_chauthtok(void);

-int do_pam_putenv(char *, char *);

+int do_pam_putenv(char *, const char *);

 char ** fetch_pam_environment(void);

 char ** fetch_pam_child_environment(void);

 void free_pam_environment(char **);

diff -up openssh/misc.c.role-mls openssh/misc.c

--- openssh/misc.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/misc.c	2018-08-22 11:14:56.817430932 +0200

@@ -542,6 +542,7 @@ char *

 colon(char *cp)

 {

 	int flag = 0;

+	int start = 1;

 	if (*cp == ':')		/* Leading colon is part of file name. */

 		return NULL;

@@ -557,6 +558,13 @@ colon(char *cp)

 			return (cp);

 		if (*cp == '/')

 			return NULL;

+		if (start) {

+		/* Slash on beginning or after dots only denotes file name. */

+			if (*cp == '/')

+				return (0);

+			if (*cp != '.')

+				start = 0;

+		}

 	}

 	return NULL;

 }

diff -up openssh-8.6p1/monitor.c.role-mls openssh-8.6p1/monitor.c

--- openssh-8.6p1/monitor.c.role-mls	2021-04-16 05:55:25.000000000 +0200

+++ openssh-8.6p1/monitor.c	2021-05-21 14:21:56.719414087 +0200

@@ -117,6 +117,9 @@ int mm_answer_sign(struct ssh *, int, st

 int mm_answer_pwnamallow(struct ssh *, int, struct sshbuf *);

 int mm_answer_auth2_read_banner(struct ssh *, int, struct sshbuf *);

 int mm_answer_authserv(struct ssh *, int, struct sshbuf *);

+#ifdef WITH_SELINUX

+int mm_answer_authrole(struct ssh *, int, struct sshbuf *);

+#endif

 int mm_answer_authpassword(struct ssh *, int, struct sshbuf *);

 int mm_answer_bsdauthquery(struct ssh *, int, struct sshbuf *);

 int mm_answer_bsdauthrespond(struct ssh *, int, struct sshbuf *);

@@ -195,6 +198,9 @@ struct mon_table mon_dispatch_proto20[]

     {MONITOR_REQ_SIGN, MON_ONCE, mm_answer_sign},

     {MONITOR_REQ_PWNAM, MON_ONCE, mm_answer_pwnamallow},

     {MONITOR_REQ_AUTHSERV, MON_ONCE, mm_answer_authserv},

+#ifdef WITH_SELINUX

+    {MONITOR_REQ_AUTHROLE, MON_ONCE, mm_answer_authrole},

+#endif

     {MONITOR_REQ_AUTH2_READ_BANNER, MON_ONCE, mm_answer_auth2_read_banner},

     {MONITOR_REQ_AUTHPASSWORD, MON_AUTH, mm_answer_authpassword},

 #ifdef USE_PAM

@@ -803,6 +809,9 @@ mm_answer_pwnamallow(struct ssh *ssh, in

 	/* Allow service/style information on the auth context */

 	monitor_permit(mon_dispatch, MONITOR_REQ_AUTHSERV, 1);

+#ifdef WITH_SELINUX

+	monitor_permit(mon_dispatch, MONITOR_REQ_AUTHROLE, 1);

+#endif

 	monitor_permit(mon_dispatch, MONITOR_REQ_AUTH2_READ_BANNER, 1);

 #ifdef USE_PAM

@@ -877,6 +886,26 @@ key_base_type_match(const char *method,

 	return found;

 }

+#ifdef WITH_SELINUX

+int

+mm_answer_authrole(struct ssh *ssh, int sock, struct sshbuf *m)

+{

+	int r;

+	monitor_permit_authentications(1);

+

+	if ((r = sshbuf_get_cstring(m, &authctxt->role, NULL)) != 0)

+		fatal_f("buffer error: %s", ssh_err(r));

+	debug3_f("role=%s", authctxt->role);

+

+	if (strlen(authctxt->role) == 0) {

+		free(authctxt->role);

+		authctxt->role = NULL;

+	}

+

+	return (0);

+}

+#endif

+

 int

 mm_answer_authpassword(struct ssh *ssh, int sock, struct sshbuf *m)

 {

@@ -1251,7 +1280,7 @@ monitor_valid_userblob(struct ssh *ssh,

 {

 	struct sshbuf *b;

 	const u_char *p;

-	char *userstyle, *cp;

+	char *userstyle, *s, *cp;

 	size_t len;

 	u_char type;

 	int r, fail = 0;

@@ -1282,6 +1311,8 @@ monitor_valid_userblob(struct ssh *ssh,

 		fail++;

 	if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)

 		fatal_fr(r, "parse userstyle");

+	if ((s = strchr(cp, '/')) != NULL)

+		*s = '\0';

 	xasprintf(&userstyle, "%s%s%s", authctxt->user,

 	    authctxt->style ? ":" : "",

 	    authctxt->style ? authctxt->style : "");

@@ -1317,7 +1348,7 @@ monitor_valid_hostbasedblob(const u_char

 {

 	struct sshbuf *b;

 	const u_char *p;

-	char *cp, *userstyle;

+	char *cp, *s, *userstyle;

 	size_t len;

 	int r, fail = 0;

 	u_char type;

@@ -1338,6 +1370,8 @@ monitor_valid_hostbasedblob(const u_char

 		fail++;

 	if ((r = sshbuf_get_cstring(b, &cp, NULL)) != 0)

 		fatal_fr(r, "parse userstyle");

+	if ((s = strchr(cp, '/')) != NULL)

+		*s = '\0';

 	xasprintf(&userstyle, "%s%s%s", authctxt->user,

 	    authctxt->style ? ":" : "",

 	    authctxt->style ? authctxt->style : "");

diff -up openssh/monitor.h.role-mls openssh/monitor.h

--- openssh/monitor.h.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/monitor.h	2018-08-22 11:14:56.818430941 +0200

@@ -55,6 +55,10 @@ enum monitor_reqtype {

 	MONITOR_REQ_GSSCHECKMIC = 48, MONITOR_ANS_GSSCHECKMIC = 49,

 	MONITOR_REQ_TERM = 50,

+#ifdef WITH_SELINUX

+	MONITOR_REQ_AUTHROLE = 80,

+#endif

+

 	MONITOR_REQ_PAM_START = 100,

 	MONITOR_REQ_PAM_ACCOUNT = 102, MONITOR_ANS_PAM_ACCOUNT = 103,

 	MONITOR_REQ_PAM_INIT_CTX = 104, MONITOR_ANS_PAM_INIT_CTX = 105,

diff -up openssh/monitor_wrap.c.role-mls openssh/monitor_wrap.c

--- openssh/monitor_wrap.c.role-mls	2018-08-22 11:14:56.818430941 +0200

+++ openssh/monitor_wrap.c	2018-08-22 11:21:47.938747968 +0200

@@ -390,6 +390,27 @@ mm_inform_authserv(char *service, char *

 	sshbuf_free(m);

 }

+/* Inform the privileged process about role */

+

+#ifdef WITH_SELINUX

+void

+mm_inform_authrole(char *role)

+{

+	int r;

+	struct sshbuf *m;

+

+	debug3_f("entering");

+

+	if ((m = sshbuf_new()) == NULL)

+		fatal_f("sshbuf_new failed");

+	if ((r = sshbuf_put_cstring(m, role ? role : "")) != 0)

+		fatal_f("buffer error: %s", ssh_err(r));

+	mm_request_send(pmonitor->m_recvfd, MONITOR_REQ_AUTHROLE, m);

+

+	sshbuf_free(m);

+}

+#endif

+

 /* Do the password authentication */

 int

 mm_auth_password(struct ssh *ssh, char *password)

diff -up openssh/monitor_wrap.h.role-mls openssh/monitor_wrap.h

--- openssh/monitor_wrap.h.role-mls	2018-08-22 11:14:56.818430941 +0200

+++ openssh/monitor_wrap.h	2018-08-22 11:22:10.439929513 +0200

@@ -44,6 +44,9 @@ DH *mm_choose_dh(int, int, int);

     const u_char *, size_t, const char *, const char *,

     const char *, u_int compat);

 void mm_inform_authserv(char *, char *);

+#ifdef WITH_SELINUX

+void mm_inform_authrole(char *);

+#endif

 struct passwd *mm_getpwnamallow(struct ssh *, const char *);

 char *mm_auth2_read_banner(void);

 int mm_auth_password(struct ssh *, char *);

diff -up openssh/openbsd-compat/Makefile.in.role-mls openssh/openbsd-compat/Makefile.in

--- openssh/openbsd-compat/Makefile.in.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/openbsd-compat/Makefile.in	2018-08-22 11:14:56.819430949 +0200

@@ -92,7 +92,8 @@ PORTS=	port-aix.o \

 	port-prngd.o \

 	port-solaris.o \

 	port-net.o \

-	port-uw.o

+	port-uw.o \

+	port-linux-sshd.o

 .c.o:

 	$(CC) $(CFLAGS_NOPIE) $(PICFLAG) $(CPPFLAGS) -c $<

diff -up openssh/openbsd-compat/port-linux.c.role-mls openssh/openbsd-compat/port-linux.c

--- openssh/openbsd-compat/port-linux.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/openbsd-compat/port-linux.c	2018-08-22 11:14:56.819430949 +0200

@@ -100,37 +100,6 @@ ssh_selinux_getctxbyname(char *pwname)

 	return sc;

 }

-/* Set the execution context to the default for the specified user */

-void

-ssh_selinux_setup_exec_context(char *pwname)

-{

-	char *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);

-			break;

-		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)

@@ -145,7 +114,11 @@ ssh_selinux_setup_pty(char *pwname, cons

 	debug3("%s: setting TTY context on %s", __func__, tty);

-	user_ctx = ssh_selinux_getctxbyname(pwname);

+	if (getexeccon(&user_ctx) != 0) {

+		error_f("getexeccon: %s", strerror(errno));

+		goto out;

+	}

+

 	/* XXX: should these calls fatal() upon failure in enforcing mode? */

diff -up openssh/openbsd-compat/port-linux.h.role-mls openssh/openbsd-compat/port-linux.h

--- openssh/openbsd-compat/port-linux.h.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/openbsd-compat/port-linux.h	2018-08-22 11:14:56.819430949 +0200

@@ -20,9 +20,10 @@

 #ifdef WITH_SELINUX

 int ssh_selinux_enabled(void);

 void ssh_selinux_setup_pty(char *, const char *);

-void ssh_selinux_setup_exec_context(char *);

 void ssh_selinux_change_context(const char *);

 void ssh_selinux_setfscreatecon(const char *);

+

+void sshd_selinux_setup_exec_context(char *);

 #endif

 #ifdef LINUX_OOM_ADJUST

diff -up openssh/openbsd-compat/port-linux-sshd.c.role-mls openssh/openbsd-compat/port-linux-sshd.c

--- openssh/openbsd-compat/port-linux-sshd.c.role-mls	2018-08-22 11:14:56.819430949 +0200

+++ openssh/openbsd-compat/port-linux-sshd.c	2018-08-22 11:14:56.819430949 +0200

@@ -0,0 +1,421 @@

+/*

+ * Copyright (c) 2005 Daniel Walsh <dwalsh@redhat.com>

+ * Copyright (c) 2014 Petr Lautrbach <plautrba@redhat.com>

+ *

+ * 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 for sshd at present

+ */

+

+#include "includes.h"

+

+#if defined(WITH_SELINUX) || defined(LINUX_OOM_ADJUST)

+#include <errno.h>

+#include <stdarg.h>

+#include <string.h>

+#include <stdio.h>

+#include <stdlib.h>

+

+#include "log.h"

+#include "xmalloc.h"

+#include "misc.h"      /* servconf.h needs misc.h for struct ForwardOptions */

+#include "servconf.h"

+#include "port-linux.h"

+#include "sshkey.h"

+#include "hostfile.h"

+#include "auth.h"

+

+#ifdef WITH_SELINUX

+#include <selinux/selinux.h>

+#include <selinux/context.h>

+#include <selinux/get_context_list.h>

+#include <selinux/get_default_type.h>

+

+#ifdef HAVE_LINUX_AUDIT

+#include <libaudit.h>

+#include <unistd.h>

+#endif

+

+extern ServerOptions options;

+extern Authctxt *the_authctxt;

+extern int inetd_flag;

+extern int rexeced_flag;

+

+/* Send audit message */

+static int

+sshd_selinux_send_audit_message(int success, security_context_t default_context,

+		       security_context_t selected_context)

+{

+	int rc=0;

+#ifdef HAVE_LINUX_AUDIT

+	char *msg = NULL;

+	int audit_fd = audit_open();

+	security_context_t default_raw=NULL;

+	security_context_t selected_raw=NULL;

+	rc = -1;

+	if (audit_fd < 0) {

+		if (errno == EINVAL || errno == EPROTONOSUPPORT ||

+					errno == EAFNOSUPPORT)

+				return 0; /* No audit support in kernel */

+		error("Error connecting to audit system.");

+		return rc;

+	}

+	if (selinux_trans_to_raw_context(default_context, &default_raw) < 0) {

+		error("Error translating default context.");

+		default_raw = NULL;

+	}

+	if (selinux_trans_to_raw_context(selected_context, &selected_raw) < 0) {

+		error("Error translating selected context.");

+		selected_raw = NULL;

+	}

+	if (asprintf(&msg, "sshd: default-context=%s selected-context=%s",

+		     default_raw ? default_raw : (default_context ? default_context: "?"),

+		     selected_context ? selected_raw : (selected_context ? selected_context :"?")) < 0) {

+		error("Error allocating memory.");

+		goto out;

+	}

+	if (audit_log_user_message(audit_fd, AUDIT_USER_ROLE_CHANGE,

+				   msg, NULL, NULL, NULL, success) <= 0) {

+		error("Error sending audit message.");

+		goto out;

+	}

+	rc = 0;

+      out:

+	free(msg);

+	freecon(default_raw);

+	freecon(selected_raw);

+	close(audit_fd);

+#endif

+	return rc;

+}

+

+static int

+mls_range_allowed(security_context_t src, security_context_t dst)

+{

+	struct av_decision avd;

+	int retval;

+	access_vector_t bit;

+	security_class_t class;

+

+	debug_f("src:%s dst:%s", src, dst);

+	class = string_to_security_class("context");

+	if (!class) {

+		error("string_to_security_class failed to translate security class context");

+		return 1;

+	}

+	bit = string_to_av_perm(class, "contains");

+	if (!bit) {

+		error("string_to_av_perm failed to translate av perm contains");

+		return 1;

+	}

+	retval = security_compute_av(src, dst, class, bit, &avd);

+	if (retval || ((bit & avd.allowed) != bit))

+		return 0;

+

+	return 1;

+}

+

+static int

+get_user_context(const char *sename, const char *role, const char *lvl,

+	security_context_t *sc) {

+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL

+	if (lvl == NULL || lvl[0] == '\0' || get_default_context_with_level(sename, lvl, NULL, sc) != 0) {

+	        /* User may have requested a level completely outside of his 

+	           allowed range. We get a context just for auditing as the

+	           range check below will certainly fail for default context. */

+#endif

+		if (get_default_context(sename, NULL, sc) != 0) {

+			*sc = NULL;

+			return -1;

+		}

+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL

+	}

+#endif

+	if (role != NULL && role[0]) {

+		context_t con;

+		char *type=NULL;

+		if (get_default_type(role, &type) != 0) {

+			error("get_default_type: failed to get default type for '%s'",

+				role);

+			goto out;

+		}

+		con = context_new(*sc);

+		if (!con) {

+			goto out;

+		}

+		context_role_set(con, role);

+		context_type_set(con, type);

+		freecon(*sc);

+		*sc = strdup(context_str(con));

+		context_free(con);

+		if (!*sc)

+			return -1;

+	}

+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL

+	if (lvl != NULL && lvl[0]) {

+		/* verify that the requested range is obtained */

+		context_t con;

+		security_context_t obtained_raw;

+		security_context_t requested_raw;

+		con = context_new(*sc);

+		if (!con) {

+			goto out;

+		}

+		context_range_set(con, lvl);

+		if (selinux_trans_to_raw_context(*sc, &obtained_raw) < 0) {

+			context_free(con);

+			goto out;

+		}

+		if (selinux_trans_to_raw_context(context_str(con), &requested_raw) < 0) {

+			freecon(obtained_raw);

+			context_free(con);

+			goto out;

+		}

+

+		debug("get_user_context: obtained context '%s' requested context '%s'",

+			obtained_raw, requested_raw);

+		if (strcmp(obtained_raw, requested_raw)) {

+			/* set the context to the real requested one but fail */

+			freecon(requested_raw);

+			freecon(obtained_raw);

+			freecon(*sc);

+			*sc = strdup(context_str(con));

+			context_free(con);

+			return -1;

+		}

+		freecon(requested_raw);

+		freecon(obtained_raw);

+		context_free(con);

+	}

+#endif

+	return 0;

+      out:

+	freecon(*sc);

+	*sc = NULL;

+	return -1;

+}

+

+static void

+ssh_selinux_get_role_level(char **role, const char **level)

+{

+	*role = NULL;

+	*level = NULL;

+	if (the_authctxt) {

+		if (the_authctxt->role != NULL) {

+			char *slash;

+			*role = xstrdup(the_authctxt->role);

+			if ((slash = strchr(*role, '/')) != NULL) {

+				*slash = '\0';

+				*level = slash + 1;

+			}

+		}

+	}

+}

+

+/* Return the default security context for the given username */

+static int

+sshd_selinux_getctxbyname(char *pwname,

+	security_context_t *default_sc, security_context_t *user_sc)

+{

+	char *sename, *lvl;

+	char *role;

+	const char *reqlvl;

+	int r = 0;

+	context_t con = NULL;

+

+	ssh_selinux_get_role_level(&role, &reqlvl);

+

+#ifdef HAVE_GETSEUSERBYNAME

+	if ((r=getseuserbyname(pwname, &sename, &lvl)) != 0) {

+		sename = NULL;

+		lvl = NULL;

+	}

+#else

+	sename = pwname;

+	lvl = "";

+#endif

+

+	if (r == 0) {

+#ifdef HAVE_GET_DEFAULT_CONTEXT_WITH_LEVEL

+		r = get_default_context_with_level(sename, lvl, NULL, default_sc);

+#else

+		r = get_default_context(sename, NULL, default_sc);

+#endif

+	}

+

+	if (r == 0) {

+		/* If launched from xinetd, we must use current level */

+		if (inetd_flag && !rexeced_flag) {

+			security_context_t sshdsc=NULL;

+

+			if (getcon_raw(&sshdsc) < 0)

+				fatal("failed to allocate security context");

+

+			if ((con=context_new(sshdsc)) == NULL)

+				fatal("failed to allocate selinux context");

+			reqlvl = context_range_get(con);

+			freecon(sshdsc);

+			if (reqlvl !=NULL && lvl != NULL && strcmp(reqlvl, lvl) == 0)

+			    /* we actually don't change level */

+			    reqlvl = "";

+

+			debug_f("current connection level '%s'", reqlvl);

+

+		}

+

+		if ((reqlvl != NULL && reqlvl[0]) || (role != NULL && role[0])) {

+			r = get_user_context(sename, role, reqlvl, user_sc);

+

+			if (r == 0 && reqlvl != NULL && reqlvl[0]) {

+				security_context_t default_level_sc = *default_sc;

+				if (role != NULL && role[0]) {

+					if (get_user_context(sename, role, lvl, &default_level_sc) < 0)

+						default_level_sc = *default_sc;

+				}

+				/* verify that the requested range is contained in the user range */

+				if (mls_range_allowed(default_level_sc, *user_sc)) {

+					logit("permit MLS level %s (user range %s)", reqlvl, lvl);

+				} else {

+					r = -1;

+					error("deny MLS level %s (user range %s)", reqlvl, lvl);

+				}

+				if (default_level_sc != *default_sc)

+					freecon(default_level_sc);

+			}

+		} else {

+			*user_sc = *default_sc;

+		}

+	}

+	if (r != 0) {

+		error_f("Failed to get default SELinux security "

+		    "context for %s", pwname);

+	}

+

+#ifdef HAVE_GETSEUSERBYNAME

+	free(sename);

+	free(lvl);

+#endif

+

+	if (role != NULL)

+		free(role);

+	if (con)

+		context_free(con);

+

+	return (r);

+}

+

+/* Setup environment variables for pam_selinux */

+static int

+sshd_selinux_setup_pam_variables(void)

+{

+	const char *reqlvl;

+	char *role;

+	char *use_current;

+	int rv;

+

+	debug3_f("setting execution context");

+

+	ssh_selinux_get_role_level(&role, &reqlvl);

+

+	rv = do_pam_putenv("SELINUX_ROLE_REQUESTED", role ? role : "");

+

+	if (inetd_flag && !rexeced_flag) {

+		use_current = "1";

+	} else {

+		use_current = "";

+		rv = rv || do_pam_putenv("SELINUX_LEVEL_REQUESTED", reqlvl ? reqlvl: "");

+	}

+

+	rv = rv || do_pam_putenv("SELINUX_USE_CURRENT_RANGE", use_current);

+

+	if (role != NULL)

+		free(role);

+

+	return rv;

+}

+

+/* Set the execution context to the default for the specified user */

+void

+sshd_selinux_setup_exec_context(char *pwname)

+{

+	security_context_t user_ctx = NULL;

+	int r = 0;

+	security_context_t default_ctx = NULL;

+

+	if (!ssh_selinux_enabled())

+		return;

+

+	if (options.use_pam) {

+		/* do not compute context, just setup environment for pam_selinux */

+		if (sshd_selinux_setup_pam_variables()) {

+			switch (security_getenforce()) {

+			case -1:

+				fatal_f("security_getenforce() failed");

+			case 0:

+				error_f("SELinux PAM variable setup failure. Continuing in permissive mode.");

+			break;

+			default:

+				fatal_f("SELinux PAM variable setup failure. Aborting connection.");

+			}

+		}

+		return;

+	}

+

+	debug3_f("setting execution context");

+

+	r = sshd_selinux_getctxbyname(pwname, &default_ctx, &user_ctx);

+	if (r >= 0) {

+		r = setexeccon(user_ctx);

+		if (r < 0) {

+			error_f("Failed to set SELinux execution context %s for %s",

+			    user_ctx, pwname);

+		}

+#ifdef HAVE_SETKEYCREATECON

+		else if (setkeycreatecon(user_ctx) < 0) {

+			error_f("Failed to set SELinux keyring creation context %s for %s",

+			    user_ctx, pwname);

+		}

+#endif

+	}

+	if (user_ctx == NULL) {

+		user_ctx = default_ctx;

+	}

+	if (r < 0 || user_ctx != default_ctx) {

+		/* audit just the case when user changed a role or there was

+		   a failure */

+		sshd_selinux_send_audit_message(r >= 0, default_ctx, user_ctx);

+	}

+	if (r < 0) {

+		switch (security_getenforce()) {

+		case -1:

+			fatal_f("security_getenforce() failed");

+		case 0:

+			error_f("ELinux failure. Continuing in permissive mode.");

+			break;

+		default:

+			fatal_f("SELinux failure. Aborting connection.");

+		}

+	}

+	if (user_ctx != NULL && user_ctx != default_ctx)

+		freecon(user_ctx);

+	if (default_ctx != NULL)

+		freecon(default_ctx);

+

+	debug3_f("done");

+}

+

+#endif

+#endif

+

diff -up openssh/platform.c.role-mls openssh/platform.c

--- openssh/platform.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/platform.c	2018-08-22 11:14:56.819430949 +0200

@@ -183,7 +183,7 @@ platform_setusercontext_post_groups(stru

 	}

 #endif /* HAVE_SETPCRED */

 #ifdef WITH_SELINUX

-	ssh_selinux_setup_exec_context(pw->pw_name);

+	sshd_selinux_setup_exec_context(pw->pw_name);

 #endif

 }

diff -up openssh/sshd.c.role-mls openssh/sshd.c

--- openssh/sshd.c.role-mls	2018-08-20 07:57:29.000000000 +0200

+++ openssh/sshd.c	2018-08-22 11:14:56.820430957 +0200

@@ -2186,6 +2186,9 @@ main(int ac, char **av)

 		restore_uid();

 	}

 #endif

+#ifdef WITH_SELINUX

+	sshd_selinux_setup_exec_context(authctxt->pw->pw_name);

+#endif

 #ifdef USE_PAM

 	if (options.use_pam) {

 		do_pam_setcred(1);