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Texture pack installs took the destination directory from the archive's textures.ini, and PKG update installs from the PBOOT's DISC_ID, both unchecked, so a crafted archive or package could write outside PSP/TEXTURES or PSP/GAME. Add IsSafePathComponent() to PathUtil and check both, replacing the WebServer's own upload filename check with it too. DISC_ID from any PARAM.SFO also names configs, cheats, textures, exdata and savestates, so ReadSFO now drops one that isn't a safe name and the game gets a fake ID like homebrew. The same goes for a frame dump's ID. Combines #22419 and #22420 by Acts1631. Co-Authored-By: Acts1631 <acts1631kjv@proton.me> Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
111 lines
3.5 KiB
C++
111 lines
3.5 KiB
C++
#include "ext/libzip/zip.h"
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#include "Common/File/FileUtil.h"
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#include "Common/File/Path.h"
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#include "Core/Loaders.h"
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#include "Core/Util/GameManager.h"
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#include "Core/Util/PathUtil.h"
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#include "UnitTest.h"
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static bool TestHasParentDirComponent() {
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EXPECT_TRUE(HasParentDirComponent("../../evil.txt"));
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EXPECT_TRUE(HasParentDirComponent("game/../../evil.txt"));
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EXPECT_TRUE(HasParentDirComponent(".."));
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EXPECT_TRUE(HasParentDirComponent("sub/.."));
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EXPECT_TRUE(HasParentDirComponent("..\\evil.txt"));
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EXPECT_TRUE(HasParentDirComponent("a/b/../.."));
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EXPECT_FALSE(HasParentDirComponent("normal.txt"));
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EXPECT_FALSE(HasParentDirComponent("game/evil.txt"));
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EXPECT_FALSE(HasParentDirComponent("a.b/c.d"));
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EXPECT_FALSE(HasParentDirComponent(""));
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EXPECT_FALSE(HasParentDirComponent("/absolute/path.txt"));
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return true;
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}
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// Creates a zip archive at the given path with one entry of the given name.
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static bool CreateZipWithEntry(const Path &zipPath, const std::string &entryName, const std::string &contents) {
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int errorp = 0;
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zip_t *z = zip_open(zipPath.c_str(), ZIP_CREATE | ZIP_TRUNCATE, &errorp);
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if (!z)
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return false;
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zip_source_t *source = zip_source_buffer(z, contents.data(), contents.size(), 0);
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if (!source) {
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zip_close(z);
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return false;
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}
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if (zip_file_add(z, entryName.c_str(), source, ZIP_FL_ENC_UTF_8) < 0) {
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zip_source_free(source);
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zip_close(z);
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return false;
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}
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return zip_close(z) == 0;
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}
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// Crafts a zip with a parent-directory entry and verifies ExtractZipContents
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// refuses to write outside the destination directory (Zip Slip).
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static bool TestZipSlipExtraction() {
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Path tempRoot = Path("unittest_zip_slip_test");
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File::DeleteDirRecursively(tempRoot);
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EXPECT_TRUE(File::CreateDir(tempRoot));
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Path destDir = tempRoot / "dest";
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EXPECT_TRUE(File::CreateDir(destDir));
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Path zipPath = tempRoot / "bad.zip";
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EXPECT_TRUE(CreateZipWithEntry(zipPath, "../evil.txt", "should not escape"));
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int errorp = 0;
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zip_t *z = zip_open(zipPath.c_str(), 0, &errorp);
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EXPECT_TRUE(z != nullptr);
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ZipFileInfo info;
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info.numFiles = 1;
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info.stripChars = 0;
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info.ignoreMetaFiles = false;
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GameManager manager;
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EXPECT_TRUE(manager.ExtractZipContents(z, destDir, info, true));
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zip_close(z);
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// The malicious file must not have been written outside destDir.
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// A naive "dest / ../evil.txt" would land here.
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EXPECT_FALSE(File::Exists(tempRoot / "evil.txt"));
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// And the actual file should not exist inside destDir either.
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EXPECT_FALSE(File::Exists(destDir / "evil.txt"));
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// Clean up.
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File::Delete(zipPath);
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File::DeleteDirRecursively(tempRoot);
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return true;
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}
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static bool TestIsSafePathComponent() {
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EXPECT_TRUE(IsSafePathComponent("ULUS10041"));
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EXPECT_TRUE(IsSafePathComponent("NPJH-50465"));
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EXPECT_TRUE(IsSafePathComponent("a.b"));
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EXPECT_TRUE(IsSafePathComponent("My Game"));
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EXPECT_FALSE(IsSafePathComponent(""));
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EXPECT_FALSE(IsSafePathComponent("."));
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EXPECT_FALSE(IsSafePathComponent(".."));
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EXPECT_FALSE(IsSafePathComponent("..."));
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EXPECT_FALSE(IsSafePathComponent(".. "));
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EXPECT_FALSE(IsSafePathComponent("../ULUS10041"));
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EXPECT_FALSE(IsSafePathComponent("..\\ULUS10041"));
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EXPECT_FALSE(IsSafePathComponent("C:"));
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EXPECT_FALSE(IsSafePathComponent("ULUS10041:stream"));
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EXPECT_FALSE(IsSafePathComponent(std::string_view("ULUS\0/..", 8)));
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EXPECT_FALSE(IsSafePathComponent("ULUS\n10041"));
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return true;
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}
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bool TestZipSlip() {
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if (!TestHasParentDirComponent())
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return false;
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if (!TestIsSafePathComponent())
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return false;
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if (!TestZipSlipExtraction())
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return false;
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return true;
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}
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