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Fix host UID/GID leakage in copyFileToContainer TAR entries #11488

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Fix host UID/GID leakage in copyFileToContainer TAR entries #11488

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4 changes: 4 additions & 0 deletions core/src/main/java/org/testcontainers/utility/MountableFile.java
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Original file line number Diff line number Diff line change
Expand Up @@ -356,6 +356,10 @@ private void recursiveTar(

// TarArchiveEntry automatically sets the mode for file/directory, but we can update to ensure that the mode is set exactly (inc executable bits)
tarEntry.setMode(getUnixFileMode(itemPath));
// Avoid propagating host UID/GID into containers. This is important for rootless Docker setups
// where host IDs may be unmapped and cause permission issues after copyArchiveToContainer.
tarEntry.setUserId(0);
tarEntry.setGroupId(0);
tarArchive.putArchiveEntry(tarEntry);

if (sourceFile.isFile()) {
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15 changes: 15 additions & 0 deletions core/src/test/java/org/testcontainers/utility/MountableFileTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import lombok.Cleanup;
import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
import org.apache.commons.compress.archivers.tar.TarArchiveInputStream;
import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
import org.jetbrains.annotations.NotNull;
Expand Down Expand Up @@ -131,6 +132,20 @@ void noTrailingSlashesInTarEntryNames() throws Exception {
}
}

@Test
void tarEntriesShouldUseRootOwnership() throws Exception {
final Path file = createTempFile("owner-check.txt");
final MountableFile mountableFile = MountableFile.forHostPath(file.toString());

@Cleanup
final TarArchiveInputStream tais = intoTarArchive(taos -> mountableFile.transferTo(taos, "/owner-check.txt"));

final TarArchiveEntry entry = tais.getNextTarEntry();
assertThat(entry).isNotNull();
assertThat(entry.getLongUserId()).as("tar user id should not leak host uid").isZero();
assertThat(entry.getLongGroupId()).as("tar group id should not leak host gid").isZero();
}

private TarArchiveInputStream intoTarArchive(Consumer<TarArchiveOutputStream> consumer) throws IOException {
@Cleanup
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
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