319 lines
8.9 KiB
Python
Executable File
319 lines
8.9 KiB
Python
Executable File
#!/usr/bin/python -E
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from __future__ import print_function
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import os
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import errno
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import shutil
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import sys
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from optparse import OptionParser
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import bz2
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import ctypes
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sepol = ctypes.cdll.LoadLibrary('libsepol.so')
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try:
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import selinux
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import semanage
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except:
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print("You must install libselinux-python and libsemanage-python before running this tool", file=sys.stderr)
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exit(1)
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# For some reason this function doesn't exist in libselinux :\
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def copy_with_context(src, dst):
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if DEBUG:
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print("copying %s to %s" % (src, dst))
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try:
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con = selinux.lgetfilecon_raw(src)[1]
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except:
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print("Could not get file context of %s" % src, file=sys.stderr)
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exit(1)
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try:
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selinux.setfscreatecon_raw(con)
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except:
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print("Could not set fs create context: %s" %con, file=sys.stderr)
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exit(1)
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try:
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shutil.copy2(src, dst)
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except OSError as the_err:
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(err, strerr) = the_err.args
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print("Could not copy %s to %s, %s" %(src, dst, strerr), file=sys.stderr)
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exit(1)
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try:
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selinux.setfscreatecon_raw(None)
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except:
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print("Could not reset fs create context. May need to relabel system.", file=sys.stderr)
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def create_dir_from(src, dst, mode):
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if DEBUG: print("Making directory %s" % dst)
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try:
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con = selinux.lgetfilecon_raw(src)[1]
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selinux.setfscreatecon_raw(con)
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os.makedirs(dst, mode)
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except OSError as the_err:
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(err, stderr) = the_err.args
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if err == errno.EEXIST:
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pass
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else:
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print("Error creating %s" % dst, file=sys.stderr)
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exit(1)
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try:
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selinux.setfscreatecon_raw(None)
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except:
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print("Could not reset fs create context. May need to relabel system.", file=sys.stderr)
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def create_file_from(src, dst):
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if DEBUG: print("Making file %s" % dst)
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try:
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con = selinux.lgetfilecon_raw(src)[1]
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selinux.setfscreatecon_raw(con)
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open(dst, 'a').close()
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except OSError as the_err:
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(err, stderr) = the_err.args
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print("Error creating %s" % dst, file=sys.stderr)
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exit(1)
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try:
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selinux.setfscreatecon_raw(None)
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except:
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print("Could not reset fs create context. May need to relabel system.", file=sys.stderr)
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def copy_module(store, name, con, base):
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if DEBUG: print("Install module %s" % name)
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(file, ext) = os.path.splitext(name)
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if ext != ".pp":
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# Stray non-pp file in modules directory, skip
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print("warning: %s has invalid extension, skipping" % name, file=sys.stderr)
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return
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try:
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selinux.setfscreatecon_raw(con)
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if base:
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root = oldstore_path(store)
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else:
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root = oldmodules_path(store)
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bottomdir = bottomdir_path(store)
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os.mkdir("%s/%s" % (bottomdir, file))
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copy_with_context(os.path.join(root, name), "%s/%s/hll" % (bottomdir, file))
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# This is the ext file that will eventually be used to choose a compiler
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efile = open("%s/%s/lang_ext" % (bottomdir, file), "w+", 0o600)
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efile.write("pp")
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efile.close()
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except:
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print("Error installing module %s" % name, file=sys.stderr)
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exit(1)
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try:
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selinux.setfscreatecon_raw(None)
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except:
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print("Could not reset fs create context. May need to relabel system.", file=sys.stderr)
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def disable_module(file, root, name, disabledmodules):
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if DEBUG: print("Disabling %s" % name)
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(disabledname, disabledext) = os.path.splitext(file)
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create_file_from(os.path.join(root, name), "%s/%s" % (disabledmodules, disabledname))
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def migrate_store(store):
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oldstore = oldstore_path(store);
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oldmodules = oldmodules_path(store);
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disabledmodules = disabledmodules_path(store);
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newstore = newstore_path(store);
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newmodules = newmodules_path(store);
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bottomdir = bottomdir_path(store);
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print("Migrating from %s to %s" % (oldstore, newstore))
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# Build up new directory structure
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create_dir_from(oldstore, "%s/%s" % (newroot_path(), store), 0o755)
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create_dir_from(oldstore, newstore, 0o700)
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create_dir_from(oldstore, newmodules, 0o700)
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create_dir_from(oldstore, bottomdir, 0o700)
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create_dir_from(oldstore, disabledmodules, 0o700)
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# use whatever the file context of bottomdir is for the module directories
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con = selinux.lgetfilecon_raw(bottomdir)[1]
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# Special case for base since it was in a different location
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copy_module(store, "base.pp", con, 1)
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# Dir structure built, start copying files
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for root, dirs, files in os.walk(oldstore):
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if root == oldstore:
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# This is the top level directory, need to move
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for name in files:
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# Check to see if it is in TOPPATHS and copy if so
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if name in TOPPATHS:
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if name == "seusers":
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newname = "seusers.local"
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else:
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newname = name
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copy_with_context(os.path.join(root, name), os.path.join(newstore, newname))
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elif root == oldmodules:
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# This should be the modules directory
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for name in files:
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(file, ext) = os.path.splitext(name)
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if name == "base.pp":
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print("Error installing module %s, name conflicts with base" % name, file=sys.stderr)
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exit(1)
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elif ext == ".disabled":
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disable_module(file, root, name, disabledmodules)
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else:
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copy_module(store, name, con, 0)
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def rebuild_policy():
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# Ok, the modules are loaded, lets try to rebuild the policy
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print("Attempting to rebuild policy from %s" % newroot_path())
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curstore = selinux.selinux_getpolicytype()[1]
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handle = semanage.semanage_handle_create()
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if not handle:
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print("Could not create semanage handle", file=sys.stderr)
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exit(1)
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semanage.semanage_select_store(handle, curstore, semanage.SEMANAGE_CON_DIRECT)
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if not semanage.semanage_is_managed(handle):
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semanage.semanage_handle_destroy(handle)
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print("SELinux policy is not managed or store cannot be accessed.", file=sys.stderr)
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exit(1)
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rc = semanage.semanage_access_check(handle)
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if rc < semanage.SEMANAGE_CAN_WRITE:
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semanage.semanage_handle_destroy(handle)
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print("Cannot write to policy store.", file=sys.stderr)
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exit(1)
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rc = semanage.semanage_connect(handle)
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if rc < 0:
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semanage.semanage_handle_destroy(handle)
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print("Could not establish semanage connection", file=sys.stderr)
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exit(1)
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semanage.semanage_set_rebuild(handle, 1)
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rc = semanage.semanage_begin_transaction(handle)
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if rc < 0:
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semanage.semanage_handle_destroy(handle)
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print("Could not begin transaction", file=sys.stderr)
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exit(1)
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rc = semanage.semanage_commit(handle)
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if rc < 0:
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print("Could not commit transaction", file=sys.stderr)
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semanage.semanage_handle_destroy(handle)
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def oldroot_path():
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return "/etc/selinux"
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def oldstore_path(store):
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return "%s/%s/modules/active" % (oldroot_path(), store)
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def oldmodules_path(store):
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return "%s/modules" % oldstore_path(store)
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def disabledmodules_path(store):
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return "%s/disabled" % newmodules_path(store)
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def newroot_path():
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return PATH
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def newstore_path(store):
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return "%s/%s/active" % (newroot_path(), store)
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def newmodules_path(store):
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return "%s/modules" % newstore_path(store)
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def bottomdir_path(store):
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return "%s/%s" % (newmodules_path(store), PRIORITY)
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if __name__ == "__main__":
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parser = OptionParser()
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parser.add_option("-p", "--priority", dest="priority", default="100",
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help="Set priority of modules in new store (default: 100)")
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parser.add_option("-s", "--store", dest="store", default=None,
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help="Store to read from and write to")
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parser.add_option("-d", "--debug", dest="debug", action="store_true", default=False,
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help="Output debug information")
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parser.add_option("-c", "--clean", dest="clean", action="store_true", default=False,
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help="Clean old modules directory after migrate (default: no)")
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parser.add_option("-n", "--norebuild", dest="norebuild", action="store_true", default=False,
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help="Disable rebuilding policy after migration (default: no)")
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parser.add_option("-P", "--path", dest="path",
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help="Set path for the policy store (default: /var/lib/selinux)")
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(options, args) = parser.parse_args()
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DEBUG = options.debug
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PRIORITY = options.priority
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TYPE = options.store
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CLEAN = options.clean
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NOREBUILD = options.norebuild
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PATH = options.path
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if PATH is None:
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PATH = "/var/lib/selinux"
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# List of paths that go in the active 'root'
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TOPPATHS = [
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"commit_num",
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"ports.local",
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"interfaces.local",
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"nodes.local",
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"booleans.local",
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"file_contexts.local",
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"seusers",
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"users.local",
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"users_extra.local",
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"disable_dontaudit",
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"preserve_tunables" ]
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create_dir_from(oldroot_path(), newroot_path(), 0o755)
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stores = None
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if TYPE is not None:
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stores = [TYPE]
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else:
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stores = os.listdir(oldroot_path())
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# find stores in oldroot and migrate them to newroot if necessary
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for store in stores:
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if not os.path.isdir(oldmodules_path(store)):
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# already migrated or not an selinux store
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continue
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if os.path.isdir(newstore_path(store)):
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# store has already been migrated, but old modules dir still exits
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print("warning: Policy type %s has already been migrated, but modules still exist in the old store. Skipping store." % store, file=sys.stderr)
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continue
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migrate_store(store)
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if CLEAN is True:
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def remove_error(function, path, execinfo):
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print("warning: Unable to remove old store modules directory %s. Cleaning failed." % oldmodules_path(store), file=sys.stderr)
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shutil.rmtree(oldmodules_path(store), onerror=remove_error)
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if NOREBUILD is False:
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rebuild_policy()
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