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authorDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-28 21:10:15 +0200
committerDavid Oberhollenzer <david.oberhollenzer@sigma-star.at>2019-09-28 23:34:17 +0200
commitf415b29255819e19ffde16018fb9ad02cbbfd17c (patch)
tree41dfa5a80fdb2015098ad5f4210acc4c21ec3cd0 /mkfs
parent5e4d53c713d3f01ae2d24a7d2311d65761b143dc (diff)
Move fstree selinux code to gensquashfs
Same rational as for the dir-scanner code: It's actually the only user and it is going to get a lot closer integerated with libsquashfs. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
Diffstat (limited to 'mkfs')
-rw-r--r--mkfs/Makemodule.am4
-rw-r--r--mkfs/mkfs.h7
-rw-r--r--mkfs/selinux.c62
3 files changed, 72 insertions, 1 deletions
diff --git a/mkfs/Makemodule.am b/mkfs/Makemodule.am
index f1e0d0d..75fc3a4 100644
--- a/mkfs/Makemodule.am
+++ b/mkfs/Makemodule.am
@@ -3,9 +3,11 @@ gensquashfs_SOURCES += mkfs/dirscan.c
gensquashfs_LDADD = libsqfshelper.a libsquashfs.la libfstree.a libutil.la
gensquashfs_LDADD += $(LIBSELINUX_LIBS)
gensquashfs_CPPFLAGS = $(AM_CPPFLAGS)
-gensquashfs_CFLAGS = $(AM_CFLAGS)
+gensquashfs_CFLAGS = $(AM_CFLAGS) $(LIBSELINUX_CFLAGS)
+
if WITH_SELINUX
gensquashfs_CPPFLAGS += -DWITH_SELINUX
+gensquashfs_SOURCES += mkfs/selinux.c
endif
bin_PROGRAMS += gensquashfs
diff --git a/mkfs/mkfs.h b/mkfs/mkfs.h
index bce98d8..f00898b 100644
--- a/mkfs/mkfs.h
+++ b/mkfs/mkfs.h
@@ -23,6 +23,11 @@
#include <sys/xattr.h>
#endif
+#ifdef WITH_SELINUX
+#include <selinux/selinux.h>
+#include <selinux/label.h>
+#endif
+
#include <getopt.h>
#include <assert.h>
#include <unistd.h>
@@ -65,4 +70,6 @@ void process_command_line(options_t *opt, int argc, char **argv);
int fstree_from_dir(fstree_t *fs, const char *path, unsigned int flags);
+int fstree_relabel_selinux(fstree_t *fs, const char *filename);
+
#endif /* MKFS_H */
diff --git a/mkfs/selinux.c b/mkfs/selinux.c
new file mode 100644
index 0000000..5fc4f52
--- /dev/null
+++ b/mkfs/selinux.c
@@ -0,0 +1,62 @@
+/* SPDX-License-Identifier: GPL-3.0-or-later */
+/*
+ * selinux.c
+ *
+ * Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
+ */
+#include "mkfs.h"
+
+#define XATTR_NAME_SELINUX "security.selinux"
+#define XATTR_VALUE_SELINUX "system_u:object_r:unlabeled_t:s0"
+
+static int relable_node(fstree_t *fs, struct selabel_handle *sehnd,
+ tree_node_t *node)
+{
+ char *context = NULL, *path;
+ int ret;
+
+ path = fstree_get_path(node);
+ if (path == NULL)
+ goto fail;
+
+ if (selabel_lookup(sehnd, &context, path, node->mode) < 0) {
+ context = strdup(XATTR_VALUE_SELINUX);
+ if (context == NULL)
+ goto fail;
+ }
+
+ ret = fstree_add_xattr(fs, node, XATTR_NAME_SELINUX, context);
+ free(context);
+ free(path);
+ return ret;
+fail:
+ perror("relabeling files");
+ free(path);
+ return -1;
+}
+
+int fstree_relabel_selinux(fstree_t *fs, const char *filename)
+{
+ struct selabel_handle *sehnd;
+ struct selinux_opt seopts[] = {
+ { SELABEL_OPT_PATH, filename },
+ };
+ size_t i;
+ int ret = 0;
+
+ sehnd = selabel_open(SELABEL_CTX_FILE, seopts, 1);
+
+ if (sehnd == NULL) {
+ perror(filename);
+ return -1;
+ }
+
+ for (i = 2; i < fs->inode_tbl_size; ++i) {
+ ret = relable_node(fs, sehnd, fs->inode_table[i]);
+ if (ret)
+ break;
+ }
+
+ selabel_close(sehnd);
+ return ret;
+}