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Merge "Update OTA to understand SELinux filesystem labels"

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This commit is contained in:
Nick Kralevich
2013-07-18 22:25:58 +00:00
committed by Android (Google) Code Review
parent 4e361bf692 fbbd79530a
commit f771d64bcb
5 changed files with 108 additions and 32 deletions
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7
core/Makefile
View File

@@ -1147,6 +1147,7 @@ $(BUILT_TARGET_FILES_PACKAGE): \
$(INSTALLED_CACHEIMAGE_TARGET) \
$(INSTALLED_VENDORIMAGE_TARGET) \
$(INSTALLED_ANDROID_INFO_TXT_TARGET) \
$(SELINUX_FC) \
$(built_ota_tools) \
$(APKCERTS_FILE) \
$(HOST_OUT_EXECUTABLES)/fs_config \
@@ -1238,9 +1239,9 @@ endif
@# Zip everything up, preserving symlinks
$(hide) (cd $(zip_root) && zip -qry ../$(notdir $@) .)
@# Run fs_config on all the system, boot ramdisk, and recovery ramdisk files in the zip, and save the output
$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="SYSTEM/" } /^SYSTEM\// {print "system/" $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config > $(zip_root)/META/filesystem_config.txt
$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="BOOT/RAMDISK/" } /^BOOT\/RAMDISK\// {print $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config > $(zip_root)/META/boot_filesystem_config.txt
$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="RECOVERY/RAMDISK/" } /^RECOVERY\/RAMDISK\// {print $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config > $(zip_root)/META/recovery_filesystem_config.txt
$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="SYSTEM/" } /^SYSTEM\// {print "system/" $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config -S $(SELINUX_FC) > $(zip_root)/META/filesystem_config.txt
$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="BOOT/RAMDISK/" } /^BOOT\/RAMDISK\// {print $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config -S $(SELINUX_FC) > $(zip_root)/META/boot_filesystem_config.txt
$(hide) zipinfo -1 $@ | awk 'BEGIN { FS="RECOVERY/RAMDISK/" } /^RECOVERY\/RAMDISK\// {print $$2}' | $(HOST_OUT_EXECUTABLES)/fs_config -S $(SELINUX_FC) > $(zip_root)/META/recovery_filesystem_config.txt
$(hide) (cd $(zip_root) && zip -q ../$(notdir $@) META/*filesystem_config.txt)
.PHONY: target-files-package

1
tools/fs_config/Android.mk
View File

@@ -17,6 +17,7 @@ include $(CLEAR_VARS)
LOCAL_SRC_FILES := fs_config.c
LOCAL_MODULE := fs_config
LOCAL_STATIC_LIBRARIES := libselinux
LOCAL_FORCE_STATIC_EXECUTABLE := true
include $(BUILD_HOST_EXECUTABLE)

80
tools/fs_config/fs_config.c
View File

@@ -15,11 +15,16 @@
*/
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include <selinux/android.h>
#include "private/android_filesystem_config.h"
// This program takes a list of files and directories (indicated by a
@@ -29,19 +34,56 @@
//
// Example input:
//
// system/etc/dbus.conf
// data/app/
// system/etc/dbus.conf
// data/app/
//
// Output:
//
// system/etc/dbus.conf 1002 1002 440
// data/app 1000 1000 771
// system/etc/dbus.conf 1002 1002 440
// data/app 1000 1000 771
//
// or if -S is used:
//
// system/etc/dbus.conf 1002 1002 440 u:object_r:system_file:s0
// data/app 1000 1000 771 u:object_r:apk_data_file:s0
//
// Note that the output will omit the trailing slash from
// directories.
static struct selabel_handle* get_sehnd(const char* context_file) {
struct selinux_opt seopts[] = { { SELABEL_OPT_PATH, context_file } };
struct selabel_handle* sehnd = selabel_open(SELABEL_CTX_FILE, seopts, 1);
if (!sehnd) {
perror("error running selabel_open");
exit(EXIT_FAILURE);
}
return sehnd;
}
static void usage() {
fprintf(stderr, "Usage: fs_config [-S context_file]\n");
}
int main(int argc, char** argv) {
char buffer[1024];
const char* context_file = NULL;
struct selabel_handle* sehnd = NULL;
int opt;
while((opt = getopt(argc, argv, "S:")) != -1) {
switch(opt) {
case 'S':
context_file = optarg;
break;
default:
usage();
exit(EXIT_FAILURE);
}
}
if (context_file != NULL) {
sehnd = get_sehnd(context_file);
}
while (fgets(buffer, 1023, stdin) != NULL) {
int is_dir = 0;
@@ -64,7 +106,35 @@ int main(int argc, char** argv) {
unsigned uid = 0, gid = 0, mode = 0;
uint64_t capabilities;
fs_config(buffer, is_dir, &uid, &gid, &mode, &capabilities);
printf("%s %d %d %o\n", buffer, uid, gid, mode);
printf("%s %d %d %o", buffer, uid, gid, mode);
if (sehnd != NULL) {
size_t buffer_strlen = strnlen(buffer, sizeof(buffer));
if (buffer_strlen >= sizeof(buffer)) {
fprintf(stderr, "non null terminated buffer, aborting\n");
exit(EXIT_FAILURE);
}
size_t full_name_size = buffer_strlen + 2;
char* full_name = (char*) malloc(full_name_size);
if (full_name == NULL) {
perror("malloc");
exit(EXIT_FAILURE);
}
full_name[0] = '/';
strncpy(full_name + 1, buffer, full_name_size - 1);
full_name[full_name_size - 1] = '\0';
char* secontext;
if (selabel_lookup(sehnd, &secontext, full_name, ( mode | (is_dir ? S_IFDIR : S_IFREG)))) {
secontext = strdup("u:object_r:unlabeled:s0");
}
printf(" %s", secontext);
free(full_name);
freecon(secontext);
}
printf("\n");
}
return 0;
}

10
tools/releasetools/edify_generator.py
View File

@@ -217,14 +217,14 @@ class EdifyGenerator(object):
else:
raise ValueError("don't know how to write \"%s\" partitions" % (p.fs_type,))
def SetPermissions(self, fn, uid, gid, mode):
def SetPermissions(self, fn, uid, gid, mode, secontext):
"""Set file ownership and permissions."""
self.script.append('set_perm(%d, %d, 0%o, "%s");' % (uid, gid, mode, fn))
self.script.append('set_perm2(%d, %d, 0%o, "%s", "%s");' % (uid, gid, mode, secontext, fn))
def SetPermissionsRecursive(self, fn, uid, gid, dmode, fmode):
def SetPermissionsRecursive(self, fn, uid, gid, dmode, fmode, secontext):
"""Recursively set path ownership and permissions."""
self.script.append('set_perm_recursive(%d, %d, 0%o, 0%o, "%s");'
% (uid, gid, dmode, fmode, fn))
self.script.append('set_perm2_recursive(%d, %d, 0%o, 0%o, "%s", "%s");'
% (uid, gid, dmode, fmode, secontext, fn))
def MakeSymlinks(self, symlink_list):
"""Create symlinks, given a list of (dest, link) pairs."""

42
tools/releasetools/ota_from_target_files
View File

@@ -117,6 +117,7 @@ class Item:
self.uid = None
self.gid = None
self.mode = None
self.secontext = None
self.dir = dir
if name:
@@ -166,63 +167,66 @@ class Item:
for line in output.split("\n"):
if not line: continue
name, uid, gid, mode = line.split()
name, uid, gid, mode, secontext = line.split()
i = cls.ITEMS.get(name, None)
if i is not None:
i.uid = int(uid)
i.gid = int(gid)
i.mode = int(mode, 8)
i.secontext = secontext
if i.dir:
i.children.sort(key=lambda i: i.name)
# set metadata for the files generated by this script.
i = cls.ITEMS.get("system/recovery-from-boot.p", None)
if i: i.uid, i.gid, i.mode = 0, 0, 0644
if i: i.uid, i.gid, i.mode, i.secontext = 0, 0, 0644, "u:object_r:system_file:s0"
i = cls.ITEMS.get("system/etc/install-recovery.sh", None)
if i: i.uid, i.gid, i.mode = 0, 0, 0544
if i: i.uid, i.gid, i.mode, i.secontext = 0, 0, 0544, "u:object_r:system_file:s0"
def CountChildMetadata(self):
"""Count up the (uid, gid, mode) tuples for all children and
"""Count up the (uid, gid, mode, secontext) tuples for all children and
determine the best strategy for using set_perm_recursive and
set_perm to correctly chown/chmod all the files to their desired
values. Recursively calls itself for all descendants.
Returns a dict of {(uid, gid, dmode, fmode): count} counting up
Returns a dict of {(uid, gid, dmode, fmode, secontext): count} counting up
all descendants of this node. (dmode or fmode may be None.) Also
sets the best_subtree of each directory Item to the (uid, gid,
dmode, fmode) tuple that will match the most descendants of that
dmode, fmode, secontext) tuple that will match the most descendants of that
Item.
"""
assert self.dir
d = self.descendants = {(self.uid, self.gid, self.mode, None): 1}
d = self.descendants = {(self.uid, self.gid, self.mode, None, self.secontext): 1}
for i in self.children:
if i.dir:
for k, v in i.CountChildMetadata().iteritems():
d[k] = d.get(k, 0) + v
else:
k = (i.uid, i.gid, None, i.mode)
k = (i.uid, i.gid, None, i.mode, i.secontext)
d[k] = d.get(k, 0) + 1
# Find the (uid, gid, dmode, fmode) tuple that matches the most
# Find the (uid, gid, dmode, fmode, secontext) tuple that matches the most
# descendants.
# First, find the (uid, gid) pair that matches the most
# descendants.
ug = {}
for (uid, gid, _, _), count in d.iteritems():
for (uid, gid, _, _, _), count in d.iteritems():
ug[(uid, gid)] = ug.get((uid, gid), 0) + count
ug = MostPopularKey(ug, (0, 0))
# Now find the dmode and fmode that match the most descendants
# Now find the dmode, fmode and secontext that match the most descendants
# with that (uid, gid), and choose those.
best_dmode = (0, 0755)
best_fmode = (0, 0644)
best_secontext = (0, "u:object_r:system_file:s0")
for k, count in d.iteritems():
if k[:2] != ug: continue
if k[2] is not None and count >= best_dmode[0]: best_dmode = (count, k[2])
if k[3] is not None and count >= best_fmode[0]: best_fmode = (count, k[3])
self.best_subtree = ug + (best_dmode[1], best_fmode[1])
if k[4] is not None and count >= best_secontext[0]: best_secontext = (count, k[4])
self.best_subtree = ug + (best_dmode[1], best_fmode[1], best_secontext[1])
return d
@@ -234,7 +238,7 @@ class Item:
self.CountChildMetadata()
def recurse(item, current):
# current is the (uid, gid, dmode, fmode) tuple that the current
# current is the (uid, gid, dmode, fmode, secontext) tuple that the current
# item (and all its children) have already been set to. We only
# need to issue set_perm/set_perm_recursive commands if we're
# supposed to be something different.
@@ -244,17 +248,17 @@ class Item:
current = item.best_subtree
if item.uid != current[0] or item.gid != current[1] or \
item.mode != current[2]:
script.SetPermissions("/"+item.name, item.uid, item.gid, item.mode)
item.mode != current[2] or item.secontext != current[4]:
script.SetPermissions("/"+item.name, item.uid, item.gid, item.mode, item.secontext)
for i in item.children:
recurse(i, current)
else:
if item.uid != current[0] or item.gid != current[1] or \
item.mode != current[3]:
script.SetPermissions("/"+item.name, item.uid, item.gid, item.mode)
item.mode != current[3] or item.secontext != current[4]:
script.SetPermissions("/"+item.name, item.uid, item.gid, item.mode, item.secontext)
recurse(self, (-1, -1, -1, -1))
recurse(self, (-1, -1, -1, -1, "u:object_r:unlabeled:s0"))
def CopySystemFiles(input_zip, output_zip=None,
@@ -733,7 +737,7 @@ def WriteIncrementalOTAPackage(target_zip, source_zip, output_zip):
for item in deferred_patch_list:
fn, tf, sf, size, _ = item
script.ApplyPatch("/"+fn, "-", tf.size, tf.sha1, sf.sha1, "patch/"+fn+".p")
script.SetPermissions("/system/build.prop", 0, 0, 0644)
script.SetPermissions("/system/build.prop", 0, 0, 0644, "u:object_r:system_file:s0")
script.AddToZip(target_zip, output_zip)
WriteMetadata(metadata, output_zip)