Adding upstream version 255.4.upstream/255.4

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 141 insertions, 0 deletions

diff --git a/src/shared/label-util.c b/src/shared/label-util.c
new file mode 100644
index 0000000..308fbff
--- /dev/null
+++ b/src/shared/label-util.c
@@ -0,0 +1,141 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <errno.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include "btrfs-util.h"
+#include "fs-util.h"
+#include "label.h"
+#include "label-util.h"
+#include "macro.h"
+#include "selinux-util.h"
+#include "smack-util.h"
+
+int label_fix_full(
+                int atfd,
+                const char *inode_path, /* path of inode to apply label to */
+                const char *label_path, /* path to use as database lookup key in label database (typically same as inode_path, but not always) */
+                LabelFixFlags flags) {
+
+        int r, q;
+
+        if (atfd < 0 && atfd != AT_FDCWD)
+                return -EBADF;
+
+        if (!inode_path && atfd < 0) /* We need at least one of atfd and an inode path */
+                return -EINVAL;
+
+        /* If both atfd and inode_path are specified, we take the specified path relative to atfd which must be an fd to a dir.
+         *
+         * If only atfd is specified (and inode_path is NULL), we'll operated on the inode the atfd refers to.
+         *
+         * If atfd is AT_FDCWD then we'll operate on the inode the path refers to.
+         */
+
+        r = mac_selinux_fix_full(atfd, inode_path, label_path, flags);
+        q = mac_smack_fix_full(atfd, inode_path, label_path, flags);
+        if (r < 0)
+                return r;
+        if (q < 0)
+                return q;
+
+        return 0;
+}
+
+int symlink_label(const char *old_path, const char *new_path) {
+        int r;
+
+        assert(old_path);
+        assert(new_path);
+
+        r = mac_selinux_create_file_prepare(new_path, S_IFLNK);
+        if (r < 0)
+                return r;
+
+        r = RET_NERRNO(symlink(old_path, new_path));
+        mac_selinux_create_file_clear();
+
+        if (r < 0)
+                return r;
+
+        return mac_smack_fix(new_path, 0);
+}
+
+int symlink_atomic_full_label(const char *from, const char *to, bool make_relative) {
+        int r;
+
+        assert(from);
+        assert(to);
+
+        r = mac_selinux_create_file_prepare(to, S_IFLNK);
+        if (r < 0)
+                return r;
+
+        r = symlinkat_atomic_full(from, AT_FDCWD, to, make_relative);
+        mac_selinux_create_file_clear();
+
+        if (r < 0)
+                return r;
+
+        return mac_smack_fix(to, 0);
+}
+
+int mknod_label(const char *pathname, mode_t mode, dev_t dev) {
+        int r;
+
+        assert(pathname);
+
+        r = mac_selinux_create_file_prepare(pathname, mode);
+        if (r < 0)
+                return r;
+
+        r = RET_NERRNO(mknod(pathname, mode, dev));
+        mac_selinux_create_file_clear();
+
+        if (r < 0)
+                return r;
+
+        return mac_smack_fix(pathname, 0);
+}
+
+int btrfs_subvol_make_label(const char *path) {
+        int r;
+
+        assert(path);
+
+        r = mac_selinux_create_file_prepare(path, S_IFDIR);
+        if (r < 0)
+                return r;
+
+        r = btrfs_subvol_make(AT_FDCWD, path);
+        mac_selinux_create_file_clear();
+
+        if (r < 0)
+                return r;
+
+        return mac_smack_fix(path, 0);
+}
+
+static int init_internal(bool lazy) {
+        int r;
+
+        assert(!(mac_selinux_use() && mac_smack_use()));
+
+        if (lazy)
+                r = mac_selinux_init_lazy();
+        else
+                r = mac_selinux_init();
+        if (r < 0)
+                return r;
+
+        return mac_smack_init();
+}
+
+int mac_init_lazy(void) {
+        return init_internal(/* lazy=*/ true);
+}
+
+int mac_init(void) {
+        return init_internal(/* lazy=*/ false);
+}