diff -up shadow-4.8/src/chgpasswd.c.selinux-perms shadow-4.8/src/chgpasswd.c

--- shadow-4.8/src/chgpasswd.c.selinux-perms	2019-12-01 18:02:43.000000000 +0100

+++ shadow-4.8/src/chgpasswd.c	2020-01-13 10:21:44.558107260 +0100

@@ -39,6 +39,13 @@

 #include <pwd.h>

 #include <stdio.h>

 #include <stdlib.h>

+#ifdef WITH_SELINUX

+#include <selinux/selinux.h>

+#include <selinux/avc.h>

+#endif

+#ifdef WITH_LIBAUDIT

+#include <libaudit.h>

+#endif

 #ifdef ACCT_TOOLS_SETUID

 #ifdef USE_PAM

 #include "pam_defs.h"

@@ -80,6 +87,9 @@ static bool sgr_locked = false;

 #endif

 static bool gr_locked = false;

+/* The name of the caller */

+static char *myname = NULL;

+

 /* local function prototypes */

 static void fail_exit (int code);

 static /*@noreturn@*/void usage (int status);

@@ -334,6 +344,63 @@ static void check_perms (void)

 #endif				/* ACCT_TOOLS_SETUID */

 }

+#ifdef WITH_SELINUX

+static int

+log_callback (int type, const char *fmt, ...)

+{

+    int audit_fd;

+    va_list ap;

+

+    va_start(ap, fmt);

+#ifdef WITH_AUDIT

+    audit_fd = audit_open();

+

+    if (audit_fd >= 0) {

+	char *buf;

+

+	if (vasprintf (&buf, fmt, ap) < 0)

+		goto ret;

+	audit_log_user_avc_message(audit_fd, AUDIT_USER_AVC, buf, NULL, NULL,

+				   NULL, 0);

+	audit_close(audit_fd);

+	free(buf);

+	goto ret;

+    }

+

+#endif

+    vsyslog (LOG_USER | LOG_INFO, fmt, ap);

+ret:

+    va_end(ap);

+    return 0;

+}

+

+static void

+selinux_check_root (void)

+{

+    int status = -1;

+    security_context_t user_context;

+    union selinux_callback old_callback;

+

+    if (is_selinux_enabled() < 1)

+	return;

+

+    old_callback = selinux_get_callback(SELINUX_CB_LOG);

+    /* setup callbacks */

+    selinux_set_callback(SELINUX_CB_LOG, (union selinux_callback) &log_callback);

+    if ((status = getprevcon(&user_context)) < 0) {

+	selinux_set_callback(SELINUX_CB_LOG, old_callback);

+	exit(1);

+    }

+

+    status = selinux_check_access(user_context, user_context, "passwd", "passwd", NULL);

+

+    selinux_set_callback(SELINUX_CB_LOG, old_callback);

+    freecon(user_context);

+    if (status != 0 && security_getenforce() != 0)

+	exit(1);

+}

+#endif

+

 /*

  * open_files - lock and open the group databases

  */

@@ -427,6 +494,7 @@ int main (int argc, char **argv)

 	const struct group *gr;

 	struct group newgr;

+	struct passwd *pw = NULL;

 	int errors = 0;

 	int line = 0;

@@ -436,12 +504,37 @@ int main (int argc, char **argv)

 	(void) bindtextdomain (PACKAGE, LOCALEDIR);

 	(void) textdomain (PACKAGE);

+#ifdef WITH_SELINUX

+	selinux_check_root ();

+#endif

+

 	process_root_flag ("-R", argc, argv);

 	process_flags (argc, argv);

 	OPENLOG ("chgpasswd");

+#ifdef WITH_AUDIT

+	audit_help_open ();

+#endif

+

+	/*

+	 * Determine the name of the user that invoked this command. This

+	 * is really hit or miss because there are so many ways that command

+	 * can be executed and so many ways to trip up the routines that

+	 * report the user name.

+	 */

+	pw = get_my_pwent ();

+	if (NULL == pw) {

+		fprintf (stderr, _("%s: Cannot determine your user name.\n"),

+		         Prog);

+		SYSLOG ((LOG_WARN,

+		         "Cannot determine the user name of the caller (UID %lu)",

+		         (unsigned long) getuid ()));

+		exit (E_NOPERM);

+	}

+	myname = xstrdup (pw->pw_name);

+

 	check_perms ();

 #ifdef SHADOWGRP

diff -up shadow-4.8/src/chpasswd.c.selinux-perms shadow-4.8/src/chpasswd.c

--- shadow-4.8/src/chpasswd.c.selinux-perms	2019-12-01 18:02:43.000000000 +0100

+++ shadow-4.8/src/chpasswd.c	2020-01-13 10:21:44.558107260 +0100

@@ -39,6 +39,13 @@

 #include <pwd.h>

 #include <stdio.h>

 #include <stdlib.h>

+#ifdef WITH_SELINUX

+#include <selinux/selinux.h>

+#include <selinux/avc.h>

+#endif

+#ifdef WITH_LIBAUDIT

+#include <libaudit.h>

+#endif

 #ifdef USE_PAM

 #include "pam_defs.h"

 #endif				/* USE_PAM */

@@ -332,6 +339,63 @@ static void check_perms (void)

 #endif				/* USE_PAM */

 }

+#ifdef WITH_SELINUX

+static int

+log_callback (int type, const char *fmt, ...)

+{

+    int audit_fd;

+    va_list ap;

+

+    va_start(ap, fmt);

+#ifdef WITH_AUDIT

+    audit_fd = audit_open();

+

+    if (audit_fd >= 0) {

+	char *buf;

+

+	if (vasprintf (&buf, fmt, ap) < 0)

+		goto ret;

+	audit_log_user_avc_message(audit_fd, AUDIT_USER_AVC, buf, NULL, NULL,

+				   NULL, 0);

+	audit_close(audit_fd);

+	free(buf);

+	goto ret;

+    }

+

+#endif

+    vsyslog (LOG_USER | LOG_INFO, fmt, ap);

+ret:

+    va_end(ap);

+    return 0;

+}

+

+static void

+selinux_check_root (void)

+{

+    int status = -1;

+    security_context_t user_context;

+    union selinux_callback old_callback;

+

+    if (is_selinux_enabled() < 1)

+	return;

+

+    old_callback = selinux_get_callback(SELINUX_CB_LOG);

+    /* setup callbacks */

+    selinux_set_callback(SELINUX_CB_LOG, (union selinux_callback) &log_callback);

+    if ((status = getprevcon(&user_context)) < 0) {

+	selinux_set_callback(SELINUX_CB_LOG, old_callback);

+	exit(1);

+    }

+

+    status = selinux_check_access(user_context, user_context, "passwd", "passwd", NULL);

+

+    selinux_set_callback(SELINUX_CB_LOG, old_callback);

+    freecon(user_context);

+    if (status != 0 && security_getenforce() != 0)

+	exit(1);

+}

+#endif

+

 /*

  * open_files - lock and open the password databases

  */

@@ -428,6 +492,10 @@ int main (int argc, char **argv)

 	(void) bindtextdomain (PACKAGE, LOCALEDIR);

 	(void) textdomain (PACKAGE);

+#ifdef WITH_SELINUX

+	selinux_check_root ();

+#endif

+

 	process_root_flag ("-R", argc, argv);

 	process_flags (argc, argv);

@@ -440,6 +508,10 @@ int main (int argc, char **argv)

 	OPENLOG ("chpasswd");

+#ifdef WITH_AUDIT

+	audit_help_open ();

+#endif

+

 	check_perms ();

 #ifdef USE_PAM