diff --git a/include/sudo_compat.h b/include/sudo_compat.h
index c2aa3211d..eb47d9004 100644
--- a/include/sudo_compat.h
+++ b/include/sudo_compat.h
@@ -173,6 +173,19 @@
 #ifndef S_ISLNK
 # define S_ISLNK(m)		(((m) & _S_IFMT) == _S_IFLNK)
 #endif /* S_ISLNK */
+#ifndef S_ISTXT
+# define S_ISTXT		0001000
+#endif /* S_ISTXT */
+
+/*
+ * ACCESSPERMS (00777) and ALLPERMS (07777) are handy BSDisms
+ */
+#ifndef ACCESSPERMS
+# define ACCESSPERMS	(S_IRWXU|S_IRWXG|S_IRWXO)
+#endif /* ACCESSPERMS */
+#ifndef ALLPERMS
+# define ALLPERMS	(S_ISUID|S_ISGID|S_ISTXT|S_IRWXU|S_IRWXG|S_IRWXO)
+#endif /* ALLPERMS */
 
 /* For futimens() and utimensat() emulation. */
 #if !defined(HAVE_FUTIMENS) && !defined(HAVE_UTIMENSAT)
diff --git a/lib/util/strtomode.c b/lib/util/strtomode.c
index 5eeae5860..b4bad96d2 100644
--- a/lib/util/strtomode.c
+++ b/lib/util/strtomode.c
@@ -17,6 +17,7 @@
 #include <config.h>
 
 #include <sys/types.h>
+#include <sys/stat.h>
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -49,7 +50,7 @@ sudo_strtomode_v1(const char *cp, const char **errstr)
 	errno = EINVAL;
 	debug_return_int(0);
     }
-    if (lval < 0 || lval > 0777) {
+    if (lval < 0 || lval > ACCESSPERMS) {
 	if (errstr != NULL)
 	    *errstr = lval < 0 ? N_("value too small") : N_("value too large");
 	errno = ERANGE;
diff --git a/plugins/sudoers/defaults.c b/plugins/sudoers/defaults.c
index 5c8668d6c..22e566d4a 100644
--- a/plugins/sudoers/defaults.c
+++ b/plugins/sudoers/defaults.c
@@ -535,7 +535,7 @@ init_defaults(void)
 #ifdef SUDO_UMASK
     def_umask = SUDO_UMASK;
 #else
-    def_umask = 0777;
+    def_umask = ACCESSPERMS;
 #endif
     def_loglinelen = MAXLOGFILELEN;
     def_timestamp_timeout = TIMEOUT;
@@ -955,7 +955,7 @@ store_mode(const char *str, union sudo_defs_val *sd_un)
     debug_decl(store_mode, SUDOERS_DEBUG_DEFAULTS)
 
     if (str == NULL) {
-	sd_un->mode = 0777;
+	sd_un->mode = ACCESSPERMS;
     } else {
 	mode = sudo_strtomode(str, &errstr);
 	if (errstr != NULL) {
diff --git a/plugins/sudoers/goodpath.c b/plugins/sudoers/goodpath.c
index b992a7a51..33bd9d6a9 100644
--- a/plugins/sudoers/goodpath.c
+++ b/plugins/sudoers/goodpath.c
@@ -52,7 +52,7 @@ sudo_goodpath(const char *path, struct stat *sbp)
 
 	if (stat(path, sbp) == 0) {
 	    /* Make sure path describes an executable regular file. */
-	    if (S_ISREG(sbp->st_mode) && ISSET(sbp->st_mode, 0111))
+	    if (S_ISREG(sbp->st_mode) && ISSET(sbp->st_mode, S_IXUSR|S_IXGRP|S_IXOTH))
 		ret = true;
 	    else
 		errno = EACCES;
diff --git a/plugins/sudoers/logging.c b/plugins/sudoers/logging.c
index d5b8ecfb2..37d801ab7 100644
--- a/plugins/sudoers/logging.c
+++ b/plugins/sudoers/logging.c
@@ -150,7 +150,7 @@ do_logfile(const char *msg)
 
     sudoers_setlocale(SUDOERS_LOCALE_SUDOERS, &oldlocale);
 
-    oldmask = umask(077);
+    oldmask = umask(S_IRWXG|S_IRWXO);
     fp = fopen(def_logfile, "a");
     (void) umask(oldmask);
     if (fp == NULL) {
@@ -627,7 +627,8 @@ send_mail(const char *fmt, ...)
       sudo_warn("setsid");
     if (chdir("/") == -1)
       sudo_warn("chdir(/)");
-    if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
+    fd = open(_PATH_DEVNULL, O_RDWR, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+    if (fd != -1) {
 	(void) dup2(fd, STDIN_FILENO);
 	(void) dup2(fd, STDOUT_FILENO);
 	(void) dup2(fd, STDERR_FILENO);
diff --git a/plugins/sudoers/policy.c b/plugins/sudoers/policy.c
index c5de6d012..08ac25a81 100644
--- a/plugins/sudoers/policy.c
+++ b/plugins/sudoers/policy.c
@@ -568,7 +568,7 @@ sudoers_policy_exec_setup(char *argv[], char *envp[], mode_t cmnd_umask,
 	if ((command_info[info_len++] = sudo_new_key_val("iolog_group", def_iolog_group)) == NULL)
 	    goto oom;
     }
-    if (cmnd_umask != 0777) {
+    if (cmnd_umask != ACCESSPERMS) {
 	if (asprintf(&command_info[info_len++], "umask=0%o", (unsigned int)cmnd_umask) == -1)
 	    goto oom;
     }
diff --git a/plugins/sudoers/sudoers.c b/plugins/sudoers/sudoers.c
index d3169e57a..f691798ba 100644
--- a/plugins/sudoers/sudoers.c
+++ b/plugins/sudoers/sudoers.c
@@ -225,7 +225,7 @@ sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
 {
     char **edit_argv = NULL;
     char *iolog_path = NULL;
-    mode_t cmnd_umask = 0777;
+    mode_t cmnd_umask = ACCESSPERMS;
     struct sudo_nss *nss;
     bool nopass = false;
     int cmnd_status = -1, oldlocale, validated;
@@ -538,7 +538,7 @@ sudoers_policy_main(int argc, char * const argv[], int pwflag, char *env_add[],
      * If user's umask is more restrictive, OR in those bits too
      * unless umask_override is set.
      */
-    if (def_umask != 0777) {
+    if (def_umask != ACCESSPERMS) {
 	cmnd_umask = def_umask;
 	if (!def_umask_override)
 	    cmnd_umask |= user_umask;
diff --git a/plugins/sudoers/timestamp.c b/plugins/sudoers/timestamp.c
index f2f6a9e05..588695346 100644
--- a/plugins/sudoers/timestamp.c
+++ b/plugins/sudoers/timestamp.c
@@ -192,7 +192,8 @@ ts_secure_dir(char *path, bool make_it, bool quiet)
 	ret = true;
 	break;
     case SUDO_PATH_MISSING:
-	if (make_it && ts_mkdirs(path, timestamp_uid, 0700, 0711, quiet)) {
+	if (make_it && ts_mkdirs(path, timestamp_uid, S_IRWXU,
+	    S_IRWXU|S_IXGRP|S_IXOTH, quiet)) {
 	    ret = true;
 	    break;
 	}
@@ -235,7 +236,7 @@ ts_open(const char *path, int flags)
 
     if (timestamp_uid != 0)
 	uid_changed = set_perms(PERM_TIMESTAMP);
-    fd = open(path, flags, 0600);
+    fd = open(path, flags, S_IRUSR|S_IWUSR);
     if (uid_changed && !restore_perms()) {
 	/* Unable to restore permissions, should not happen. */
 	if (fd != -1) {
diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
index 63594b9c9..7018f5e9e 100644
--- a/plugins/sudoers/visudo.c
+++ b/plugins/sudoers/visudo.c
@@ -443,7 +443,7 @@ edit_sudoers(struct sudoersfile *sp, char *editor, int editor_argc,
     if (sp->tpath == NULL) {
 	if (asprintf(&sp->tpath, "%s.tmp", sp->path) == -1)
 	    sudo_fatalx(U_("%s: %s"), __func__, U_("unable to allocate memory"));
-	tfd = open(sp->tpath, O_WRONLY | O_CREAT | O_TRUNC, 0600);
+	tfd = open(sp->tpath, O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRUSR);
 	if (tfd < 0)
 	    sudo_fatal("%s", sp->tpath);
 
@@ -669,7 +669,7 @@ install_sudoers(struct sudoersfile *sp, bool oldperms)
 	if (!oldperms && fstat(sp->fd, &sb) != -1) {
 	    if (sb.st_uid != sudoers_uid || sb.st_gid != sudoers_gid)
 		ignore_result(chown(sp->path, sudoers_uid, sudoers_gid));
-	    if ((sb.st_mode & 0777) != sudoers_mode)
+	    if ((sb.st_mode & ACCESSPERMS) != sudoers_mode)
 		ignore_result(chmod(sp->path, sudoers_mode));
 	}
 	ret = true;
@@ -688,9 +688,9 @@ install_sudoers(struct sudoersfile *sp, bool oldperms)
 	    sudo_warn(U_("unable to set (uid, gid) of %s to (%u, %u)"),
 		sp->tpath, (unsigned int)sb.st_uid, (unsigned int)sb.st_gid);
 	}
-	if (chmod(sp->tpath, sb.st_mode & 0777) != 0) {
+	if (chmod(sp->tpath, sb.st_mode & ACCESSPERMS) != 0) {
 	    sudo_warn(U_("unable to change mode of %s to 0%o"), sp->tpath,
-		(unsigned int)(sb.st_mode & 0777));
+		(unsigned int)(sb.st_mode & ACCESSPERMS));
 	}
     } else {
 	if (chown(sp->tpath, sudoers_uid, sudoers_gid) != 0) {
@@ -896,7 +896,7 @@ check_owner(const char *path, bool quiet)
 		    path, sudoers_uid, sudoers_gid);
 		}
 	}
-	if ((sb.st_mode & 07777) != sudoers_mode) {
+	if ((sb.st_mode & ALLPERMS) != sudoers_mode) {
 	    ok = false;
 	    if (!quiet) {
 		fprintf(stderr, _("%s: bad permissions, should be mode 0%o\n"),
diff --git a/src/sesh.c b/src/sesh.c
index c07366d15..85a451fa7 100644
--- a/src/sesh.c
+++ b/src/sesh.c
@@ -189,7 +189,7 @@ sesh_sudoedit(int argc, char *argv[])
 	 * doesn't exist, that's OK, we'll create an empty
 	 * destination file.
 	 */
-	if ((fd_src = open(path_src, O_RDONLY|follow, 0600)) < 0) {
+	if ((fd_src = open(path_src, O_RDONLY|follow, S_IRUSR|S_IWUSR)) < 0) {
 	    if (errno != ENOENT) {
 		sudo_warn("%s", path_src);
 		if (post) {
@@ -200,7 +200,8 @@ sesh_sudoedit(int argc, char *argv[])
 	    }
 	}
 
-	if ((fd_dst = open(path_dst, oflags_dst, post ? 0644 : 0600)) < 0) {
+	if ((fd_dst = open(path_dst, oflags_dst, post ?
+	    (S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH) : (S_IRUSR|S_IWUSR))) < 0) {
 	    /* error - cleanup */
 	    sudo_warn("%s", path_dst);
 	    if (post) {
diff --git a/src/sudo.c b/src/sudo.c
index 49b48abdc..a56751d38 100644
--- a/src/sudo.c
+++ b/src/sudo.c
@@ -364,7 +364,8 @@ fix_fds(void)
     miss[STDOUT_FILENO] = fcntl(STDOUT_FILENO, F_GETFL, 0) == -1;
     miss[STDERR_FILENO] = fcntl(STDERR_FILENO, F_GETFL, 0) == -1;
     if (miss[STDIN_FILENO] || miss[STDOUT_FILENO] || miss[STDERR_FILENO]) {
-	if ((devnull = open(_PATH_DEVNULL, O_RDWR, 0644)) == -1)
+	devnull = open(_PATH_DEVNULL, O_RDWR, S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH);
+	if (devnull == -1)
 	    sudo_fatal(U_("unable to open %s"), _PATH_DEVNULL);
 	if (miss[STDIN_FILENO] && dup2(devnull, STDIN_FILENO) == -1)
 	    sudo_fatal("dup2");
diff --git a/src/sudo_edit.c b/src/sudo_edit.c
index 9c6a1ac1e..0faef4c6f 100644
--- a/src/sudo_edit.c
+++ b/src/sudo_edit.c
@@ -548,7 +548,8 @@ sudo_edit_create_tfiles(struct command_details *command_details,
 	rc = -1;
 	switch_user(command_details->euid, command_details->egid,
 	    command_details->ngroups, command_details->groups);
-	ofd = sudo_edit_open(files[i], O_RDONLY, 0644, command_details);
+	ofd = sudo_edit_open(files[i], O_RDONLY,
+	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, command_details);
 	if (ofd != -1 || errno == ENOENT) {
 	    if (ofd == -1) {
 		/* New file, verify parent dir exists unless in cwd. */
@@ -673,7 +674,8 @@ sudo_edit_copy_tfiles(struct command_details *command_details,
 	    "seteuid(%u)", user_details.uid);
 	if (seteuid(user_details.uid) != 0)
 	    sudo_fatal("seteuid(%d)", (int)user_details.uid);
-	tfd = sudo_edit_open(tf[i].tfile, O_RDONLY, 0644, NULL);
+	tfd = sudo_edit_open(tf[i].tfile, O_RDONLY,
+	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, NULL);
 	if (tfd != -1)
 	    rc = fstat(tfd, &sb);
 	sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
@@ -707,8 +709,8 @@ sudo_edit_copy_tfiles(struct command_details *command_details,
 	}
 	switch_user(command_details->euid, command_details->egid,
 	    command_details->ngroups, command_details->groups);
-	ofd = sudo_edit_open(tf[i].ofile, O_WRONLY|O_TRUNC|O_CREAT, 0644,
-	    command_details);
+	ofd = sudo_edit_open(tf[i].ofile, O_WRONLY|O_TRUNC|O_CREAT,
+	    S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH, command_details);
 	switch_user(ROOT_UID, user_details.egid,
 	    user_details.ngroups, user_details.groups);
 	if (ofd == -1) {