create our cache and lib directory always with mode 755

We autocreate for a while now the last two directories in /var/lib/apt/lists
(similar for /var/cache/apt/archives) which is very nice for systems having
any of those on tmpfs or other non-persistent storage. This also means
though that this creation is effected by the default umask, so for
people with aggressive umasks like 027 the directories will be created
with 750, which means all non-root users are left out, which is usually
exactly what we want then this umask is set, but the cache and lib
directories contain public knowledge. There isn't any need to protect
them from viewers and they render apt completely useless if not
readable.

apt-pkg/acquire.cc

@@ -92,8 +92,11 @@ void pkgAcquire::Initialize()
 static bool SetupAPTPartialDirectory(std::string const &grand, std::string const &parent)
 {
    std::string const partial = parent + "partial";
-   if (CreateAPTDirectoryIfNeeded(grand, partial) == false &&
-	 CreateAPTDirectoryIfNeeded(parent, partial) == false)
+   mode_t const mode = umask(S_IWGRP | S_IWOTH);
+   bool const creation_fail = (CreateAPTDirectoryIfNeeded(grand, partial) == false &&
+	 CreateAPTDirectoryIfNeeded(parent, partial) == false);
+   umask(mode);
+   if (creation_fail == true)
       return false;
 
    std::string const SandboxUser = _config->Find("APT::Sandbox::User");

apt-pkg/cdrom.cc

@@ -822,8 +822,11 @@ bool pkgCdrom::Add(pkgCdromStatus *log)					/*{{{*/
    // check for existence and possibly create state directory for copying
    string const listDir = _config->FindDir("Dir::State::lists");
    string const partialListDir = listDir + "partial/";
-   if (CreateAPTDirectoryIfNeeded(_config->FindDir("Dir::State"), partialListDir) == false &&
-       CreateAPTDirectoryIfNeeded(listDir, partialListDir) == false)
+   mode_t const mode = umask(S_IWGRP | S_IWOTH);
+   bool const creation_fail = (CreateAPTDirectoryIfNeeded(_config->FindDir("Dir::State"), partialListDir) == false &&
+	 CreateAPTDirectoryIfNeeded(listDir, partialListDir) == false);
+   umask(mode);
+   if (creation_fail == true)
    {
       UnmountCDROM(CDROM, NULL);
       return _error->Errno("cdrom", _("List directory %spartial is missing."), listDir.c_str());

test/integration/framework

@@ -203,7 +203,7 @@ setupenvironment() {
 	mkdir rootdir aptarchive keys
 	cd rootdir
 	mkdir -p etc/apt/apt.conf.d etc/apt/sources.list.d etc/apt/trusted.gpg.d etc/apt/preferences.d
-	mkdir -p usr/bin var/cache var/lib/apt var/log tmp
+	mkdir -p usr/bin var/cache var/lib var/log tmp
 	mkdir -p var/lib/dpkg/info var/lib/dpkg/updates var/lib/dpkg/triggers
 	touch var/lib/dpkg/available
 	mkdir -p usr/lib/apt
@@ -1341,7 +1341,7 @@ testfilestats() {
 		msgpass
 	else
 		echo >&2
-		ls -l >&2 "$1"
+		ls -ld >&2 "$1"
 		echo -n >&2 "stat(1) reports for $2: "
 		stat --format "$2" "$1"
 		msgfail
@@ -1386,6 +1386,24 @@ listcurrentlistsdirectory() {
 	done
 }
 
+### convinience hacks ###
+mkdir() {
+	# creating some directories by hand is a tedious task, so make it look simple
+	if [ "$*" = '-p rootdir/var/lib/apt/lists' ] || [ "$*" = "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists" ] ||
+	   [ "$*" = '-p rootdir/var/lib/apt/lists/partial' ] || [ "$*" = "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists/partial" ]; then
+		# only the last directory created by mkdir is effected by the -m !
+		command mkdir -m 755 -p "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt"
+		command mkdir -m 755 -p "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists"
+		command mkdir -m 700 -p "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists/partial"
+		touch "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists/lock"
+		if [ "$(id -u)" = '0' ]; then
+			chown _apt:root "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists/partial"
+		fi
+	else
+		command mkdir "$@"
+	fi
+}
+
 ### The following tests are run by most test methods automatically to check
 ### general things about commands executed without writing the test every time.
 
@@ -1410,6 +1428,8 @@ aptautotest() {
 
 aptautotest_aptget_update() {
 	if ! test -d "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists"; then return; fi
+	testfilestats "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt" '%U:%G:%a' '=' "${USER}:${USER}:755"
+	testfilestats "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists" '%U:%G:%a' '=' "${USER}:${USER}:755"
 	# all copied files are properly chmodded
 	for file in $(find "${TMPWORKINGDIRECTORY}/rootdir/var/lib/apt/lists" -maxdepth 1 -type f ! -name 'lock'); do
 		testfilestats "$file" '%U:%G:%a' '=' "${USER}:${USER}:644"

test/integration/test-apt-cdrom

@@ -125,7 +125,6 @@ $CDROM_POST" aptcdromlog add
 msgtest 'Test for the german description translation of' 'testing'
 aptcache show testing -o Acquire::Languages=de | grep -q '^Description-de: ' && msgpass || msgfail
 rm -rf rootdir/var/lib/apt/lists
-mkdir -p rootdir/var/lib/apt/lists/partial
 testequal "$CDROM_PRE
 Found 2 package indexes, 1 source indexes, 1 translation indexes and 1 signatures
 $CDROM_POST" aptcdromlog add

test/integration/test-apt-update-transactions

@@ -48,11 +48,7 @@ testrun() {
 testsetup() {
 	msgmsg 'Test with no initial data over' "$1"
 	rm -rf rootdir/var/lib/apt/lists
-	mkdir -m 700 -p rootdir/var/lib/apt/lists/partial
-	touch rootdir/var/lib/apt/lists/lock
-	if [ "$(id -u)" = '0' ]; then
-		chown _apt:root rootdir/var/lib/apt/lists/partial
-	fi
+	mkdir -p rootdir/var/lib/apt/lists/partial
 	listcurrentlistsdirectory > listsdir.lst
 	testrun 'listsdir.lst'