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-rw-r--r--fixContexts.cpp163
1 files changed, 163 insertions, 0 deletions
diff --git a/fixContexts.cpp b/fixContexts.cpp
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index 000000000..64429446e
--- /dev/null
+++ b/fixContexts.cpp
@@ -0,0 +1,163 @@
+/*
+ Copyright 2012-2016 bigbiff/Dees_Troy TeamWin
+ This file is part of TWRP/TeamWin Recovery Project.
+
+ TWRP is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ TWRP is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with TWRP. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <string>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <errno.h>
+#include <cctype>
+#include "fixContexts.hpp"
+#include "twrp-functions.hpp"
+#include "twcommon.h"
+#ifdef HAVE_SELINUX
+#include "selinux/selinux.h"
+#include "selinux/label.h"
+#include "selinux/android.h"
+#include "selinux/label.h"
+#endif
+
+using namespace std;
+
+#ifdef HAVE_SELINUX
+struct selabel_handle *sehandle;
+struct selinux_opt selinux_options[] = {
+ { SELABEL_OPT_PATH, "/file_contexts" }
+};
+
+int fixContexts::restorecon(string entry, struct stat *sb) {
+ char *oldcontext, *newcontext;
+
+ if (lgetfilecon(entry.c_str(), &oldcontext) < 0) {
+ LOGINFO("Couldn't get selinux context for %s\n", entry.c_str());
+ return -1;
+ }
+ if (selabel_lookup(sehandle, &newcontext, entry.c_str(), sb->st_mode) < 0) {
+ LOGINFO("Couldn't lookup selinux context for %s\n", entry.c_str());
+ return -1;
+ }
+ if (strcmp(oldcontext, newcontext) != 0) {
+ LOGINFO("Relabeling %s from %s to %s\n", entry.c_str(), oldcontext, newcontext);
+ if (lsetfilecon(entry.c_str(), newcontext) < 0) {
+ LOGINFO("Couldn't label %s with %s: %s\n", entry.c_str(), newcontext, strerror(errno));
+ }
+ }
+ freecon(oldcontext);
+ freecon(newcontext);
+ return 0;
+}
+
+int fixContexts::fixContextsRecursively(string name, int level) {
+ DIR *d;
+ struct dirent *de;
+ struct stat sb;
+ string path;
+
+ if (!(d = opendir(name.c_str())))
+ return -1;
+ if (!(de = readdir(d)))
+ return -1;
+
+ do {
+ if (de->d_type == DT_DIR) {
+ if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0)
+ continue;
+ path = name + "/" + de->d_name;
+ restorecon(path, &sb);
+ fixContextsRecursively(path, level + 1);
+ }
+ else {
+ path = name + "/" + de->d_name;
+ restorecon(path, &sb);
+ }
+ } while ((de = readdir(d)));
+ closedir(d);
+ return 0;
+}
+
+int fixContexts::fixDataMediaContexts(string Mount_Point) {
+ DIR *d;
+ struct dirent *de;
+ struct stat sb;
+
+ LOGINFO("Fixing media contexts on '%s'\n", Mount_Point.c_str());
+
+ sehandle = selabel_open(SELABEL_CTX_FILE, selinux_options, 1);
+ if (!sehandle) {
+ LOGINFO("Unable to open /file_contexts\n");
+ return 0;
+ }
+
+ if (TWFunc::Path_Exists(Mount_Point + "/media/0")) {
+ string dir = Mount_Point + "/media";
+ if (!(d = opendir(dir.c_str()))) {
+ LOGINFO("opendir failed (%s)\n", strerror(errno));
+ return -1;
+ }
+ if (!(de = readdir(d))) {
+ LOGINFO("readdir failed (%s)\n", strerror(errno));
+ closedir(d);
+ return -1;
+ }
+
+ do {
+ if (strcmp(de->d_name, ".") == 0 || strcmp(de->d_name, "..") == 0 || de->d_type != DT_DIR)
+ continue;
+ size_t len = strlen(de->d_name);
+ bool is_numeric = true;
+ char* folder_name = de->d_name;
+ for (size_t i = 0; i < len; i++) {
+ if (!isdigit(*folder_name)) {
+ is_numeric = false;
+ break;
+ }
+ folder_name++;
+ }
+ if (is_numeric) {
+ dir = Mount_Point + "/media/";
+ dir += de->d_name;
+ restorecon(dir, &sb);
+ fixContextsRecursively(dir, 0);
+ }
+ } while ((de = readdir(d)));
+ closedir(d);
+ } else if (TWFunc::Path_Exists(Mount_Point + "/media")) {
+ restorecon(Mount_Point + "/media", &sb);
+ fixContextsRecursively(Mount_Point + "/media", 0);
+ } else {
+ LOGINFO("fixDataMediaContexts: %s/media does not exist!\n", Mount_Point.c_str());
+ return 0;
+ }
+ selabel_close(sehandle);
+ return 0;
+}
+
+#else
+
+int fixContexts::restorecon(string entry __unused, struct stat *sb __unused) {
+ return -1;
+}
+
+int fixContexts::fixContextsRecursively(string name __unused, int level __unused) {
+ return -1;
+}
+
+int fixContexts::fixDataMediaContexts(string Mount_Point __unused) {
+ return -1;
+}
+#endif