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247 lines
6.8 KiB
Bash
Executable File
247 lines
6.8 KiB
Bash
Executable File
#!/bin/bash
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# SPDX-License-Identifier: LGPL-2.1-or-later
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#
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# Basic tests for types creating/writing files
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set -eux
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set -o pipefail
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rm -fr /tmp/{f,F,w}
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mkdir /tmp/{f,F,w}
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touch /tmp/file-owned-by-root
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#
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# 'f'
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#
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systemd-tmpfiles --create - <<EOF
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f /tmp/f/1 0644 - - - -
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f /tmp/f/2 0644 - - - This string should be written
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EOF
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### '1' should exist and be empty
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test -f /tmp/f/1; test ! -s /tmp/f/1
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test "$(stat -c %U:%G:%a /tmp/f/1)" = "root:root:644"
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test "$(stat -c %U:%G:%a /tmp/f/2)" = "root:root:644"
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test "$(< /tmp/f/2)" = "This string should be written"
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### The perms are supposed to be updated even if the file already exists.
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systemd-tmpfiles --create - <<EOF
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f /tmp/f/1 0666 daemon daemon - This string should not be written
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EOF
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# file should be empty
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test ! -s /tmp/f/1
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test "$(stat -c %U:%G:%a /tmp/f/1)" = "daemon:daemon:666"
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### But we shouldn't try to set perms on an existing file which is not a
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### regular one.
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mkfifo /tmp/f/fifo
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chmod 644 /tmp/f/fifo
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/f/fifo 0666 daemon daemon - This string should not be written
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EOF
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test -p /tmp/f/fifo
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test "$(stat -c %U:%G:%a /tmp/f/fifo)" = "root:root:644"
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### 'f' should not follow symlinks.
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ln -s missing /tmp/f/dangling
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ln -s /tmp/file-owned-by-root /tmp/f/symlink
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/f/dangling 0644 daemon daemon - -
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f /tmp/f/symlink 0644 daemon daemon - -
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EOF
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test ! -e /tmp/f/missing
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test "$(stat -c %U:%G:%a /tmp/file-owned-by-root)" = "root:root:644"
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### Handle read-only filesystem gracefully: we shouldn't fail if the target
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### already exists and have the correct perms.
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mkdir /tmp/f/rw-fs
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mkdir /tmp/f/ro-fs
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touch /tmp/f/rw-fs/foo
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chmod 644 /tmp/f/rw-fs/foo
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mount -o bind,ro /tmp/f/rw-fs /tmp/f/ro-fs
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systemd-tmpfiles --create - <<EOF
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f /tmp/f/ro-fs/foo 0644 - - - - This string should not be written
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EOF
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test -f /tmp/f/ro-fs/foo; test ! -s /tmp/f/ro-fs/foo
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/f/ro-fs/foo 0666 - - - -
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EOF
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test "$(stat -c %U:%G:%a /tmp/f/fifo)" = "root:root:644"
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/f/ro-fs/bar 0644 - - - -
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EOF
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test ! -e /tmp/f/ro-fs/bar
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### 'f' shouldn't follow unsafe paths.
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mkdir /tmp/f/daemon
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ln -s /root /tmp/f/daemon/unsafe-symlink
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chown -R --no-dereference daemon:daemon /tmp/f/daemon
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/f/daemon/unsafe-symlink/exploit 0644 daemon daemon - -
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EOF
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test ! -e /tmp/f/daemon/unsafe-symlink/exploit
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#
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# 'F'
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#
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echo "This should be truncated" >/tmp/F/truncated
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echo "This should be truncated" >/tmp/F/truncated-with-content
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systemd-tmpfiles --create - <<EOF
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F /tmp/F/created 0644 - - - -
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F /tmp/F/created-with-content 0644 - - - new content
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F /tmp/F/truncated 0666 daemon daemon - -
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F /tmp/F/truncated-with-content 0666 daemon daemon - new content
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EOF
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test -f /tmp/F/created; test ! -s /tmp/F/created
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test -f /tmp/F/created-with-content
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test "$(< /tmp/F/created-with-content)" = "new content"
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test -f /tmp/F/truncated; test ! -s /tmp/F/truncated
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test "$(stat -c %U:%G:%a /tmp/F/truncated)" = "daemon:daemon:666"
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test -s /tmp/F/truncated-with-content
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test "$(stat -c %U:%G:%a /tmp/F/truncated-with-content)" = "daemon:daemon:666"
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### We shouldn't try to truncate anything but regular files since the behavior is
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### unspecified in the other cases.
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mkfifo /tmp/F/fifo
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(! systemd-tmpfiles --create -) <<EOF
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F /tmp/F/fifo 0644 - - - -
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EOF
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test -p /tmp/F/fifo
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### 'F' should not follow symlinks.
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ln -s missing /tmp/F/dangling
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ln -s /tmp/file-owned-by-root /tmp/F/symlink
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/F/dangling 0644 daemon daemon - -
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f /tmp/F/symlink 0644 daemon daemon - -
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EOF
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test ! -e /tmp/F/missing
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test "$(stat -c %U:%G:%a /tmp/file-owned-by-root)" = "root:root:644"
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### Handle read-only filesystem gracefully: we shouldn't fail if the target
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### already exists and is empty.
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mkdir /tmp/F/rw-fs
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mkdir /tmp/F/ro-fs
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touch /tmp/F/rw-fs/foo
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chmod 644 /tmp/F/rw-fs/foo
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mount -o bind,ro /tmp/F/rw-fs /tmp/F/ro-fs
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systemd-tmpfiles --create - <<EOF
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F /tmp/F/ro-fs/foo 0644 - - - -
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EOF
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test -f /tmp/F/ro-fs/foo; test ! -s /tmp/F/ro-fs/foo
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echo "truncating is not allowed anymore" >/tmp/F/rw-fs/foo
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(! systemd-tmpfiles --create -) <<EOF
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F /tmp/F/ro-fs/foo 0644 - - - -
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EOF
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(! systemd-tmpfiles --create -) <<EOF
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F /tmp/F/ro-fs/foo 0644 - - - - This string should not be written
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EOF
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test -f /tmp/F/ro-fs/foo
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grep -q 'truncating is not allowed' /tmp/F/ro-fs/foo
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# Trying to change the perms should fail.
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: >/tmp/F/rw-fs/foo
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(! systemd-tmpfiles --create -) <<EOF
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F /tmp/F/ro-fs/foo 0666 - - - -
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EOF
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test "$(stat -c %U:%G:%a /tmp/F/ro-fs/foo)" = "root:root:644"
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### Try to create a new file.
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(! systemd-tmpfiles --create -) <<EOF
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F /tmp/F/ro-fs/bar 0644 - - - -
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EOF
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test ! -e /tmp/F/ro-fs/bar
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### 'F' shouldn't follow unsafe paths.
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mkdir /tmp/F/daemon
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ln -s /root /tmp/F/daemon/unsafe-symlink
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chown -R --no-dereference daemon:daemon /tmp/F/daemon
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(! systemd-tmpfiles --create -) <<EOF
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F /tmp/F/daemon/unsafe-symlink/exploit 0644 daemon daemon - -
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EOF
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test ! -e /tmp/F/daemon/unsafe-symlink/exploit
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#
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# 'w'
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#
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touch /tmp/w/overwritten
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touch /tmp/w/appended
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### nop if the target does not exist.
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systemd-tmpfiles --create - <<EOF
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w /tmp/w/unexistent 0644 - - - new content
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EOF
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test ! -e /tmp/w/unexistent
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### no argument given -> fails.
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(! systemd-tmpfiles --create -) <<EOF
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w /tmp/w/unexistent 0644 - - - -
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EOF
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### write into an empty file.
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systemd-tmpfiles --create - <<EOF
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w /tmp/w/overwritten 0644 - - - old content
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EOF
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test -f /tmp/w/overwritten
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test "$(< /tmp/w/overwritten)" = "old content"
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### old content is overwritten
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systemd-tmpfiles --create - <<EOF
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w /tmp/w/overwritten 0644 - - - new content
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EOF
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test -f /tmp/w/overwritten
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test "$(< /tmp/w/overwritten)" = "new content"
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### append lines
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systemd-tmpfiles --create - <<EOF
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w+ /tmp/w/appended 0644 - - - 1
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w+ /tmp/w/appended 0644 - - - 2\n
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w+ /tmp/w/appended 0644 - - - 3
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EOF
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test -f /tmp/w/appended
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test "$(< /tmp/w/appended)" = "$(echo -ne '12\n3')"
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### writing into an 'exotic' file should be allowed.
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systemd-tmpfiles --create - <<EOF
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w /dev/null - - - - new content
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EOF
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### 'w' follows symlinks
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ln -s ./overwritten /tmp/w/symlink
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systemd-tmpfiles --create - <<EOF
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w /tmp/w/symlink - - - - $(readlink -e /tmp/w/symlink)
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EOF
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readlink -e /tmp/w/symlink
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test "$(< /tmp/w/overwritten)" = "/tmp/w/overwritten"
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### 'w' shouldn't follow unsafe paths.
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mkdir /tmp/w/daemon
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ln -s /root /tmp/w/daemon/unsafe-symlink
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chown -R --no-dereference daemon:daemon /tmp/w/daemon
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(! systemd-tmpfiles --create -) <<EOF
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f /tmp/w/daemon/unsafe-symlink/exploit 0644 daemon daemon - -
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EOF
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test ! -e /tmp/w/daemon/unsafe-symlink/exploit
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