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gecko/modules/libjar/nsJAR.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <string.h>
#include "nsJARInputStream.h"
#include "nsJAR.h"
#include "nsIFile.h"
#include "nsICertificatePrincipal.h"
#include "nsIConsoleService.h"
#include "nsICryptoHash.h"
#include "nsIDataSignatureVerifier.h"
#include "prprf.h"
#include "mozilla/Omnijar.h"
#ifdef XP_UNIX
#include <sys/stat.h>
#elif defined (XP_WIN)
#include <io.h>
#endif
using namespace mozilla;
//----------------------------------------------
// nsJARManifestItem declaration
//----------------------------------------------
/*
* nsJARManifestItem contains meta-information pertaining
* to an individual JAR entry, taken from the
* META-INF/MANIFEST.MF and META-INF/ *.SF files.
* This is security-critical information, defined here so it is not
* accessible from anywhere else.
*/
typedef enum
{
JAR_INVALID = 1,
JAR_INTERNAL = 2,
JAR_EXTERNAL = 3
} JARManifestItemType;
class nsJARManifestItem
{
public:
JARManifestItemType mType;
// True if the second step of verification (VerifyEntry)
// has taken place:
bool entryVerified;
// Not signed, valid, or failure code
int16_t status;
// Internal storage of digests
nsCString calculatedSectionDigest;
nsCString storedEntryDigest;
nsJARManifestItem();
virtual ~nsJARManifestItem();
};
//-------------------------------------------------
// nsJARManifestItem constructors and destructor
//-------------------------------------------------
nsJARManifestItem::nsJARManifestItem(): mType(JAR_INTERNAL),
entryVerified(false),
status(JAR_NOT_SIGNED)
{
}
nsJARManifestItem::~nsJARManifestItem()
{
}
//----------------------------------------------
// nsJAR constructor/destructor
//----------------------------------------------
// The following initialization makes a guess of 10 entries per jarfile.
nsJAR::nsJAR(): mZip(new nsZipArchive()),
mManifestData(10),
mParsedManifest(false),
mGlobalStatus(JAR_MANIFEST_NOT_PARSED),
mReleaseTime(PR_INTERVAL_NO_TIMEOUT),
mCache(nullptr),
mLock("nsJAR::mLock"),
mTotalItemsInManifest(0),
mOpened(false)
{
}
nsJAR::~nsJAR()
{
Close();
}
NS_IMPL_QUERY_INTERFACE(nsJAR, nsIZipReader)
NS_IMPL_ADDREF(nsJAR)
// Custom Release method works with nsZipReaderCache...
MozExternalRefCountType nsJAR::Release(void)
{
nsrefcnt count;
NS_PRECONDITION(0 != mRefCnt, "dup release");
count = --mRefCnt;
NS_LOG_RELEASE(this, count, "nsJAR");
if (0 == count) {
mRefCnt = 1; /* stabilize */
/* enable this to find non-threadsafe destructors: */
/* NS_ASSERT_OWNINGTHREAD(nsJAR); */
delete this;
return 0;
}
else if (1 == count && mCache) {
#ifdef DEBUG
nsresult rv =
#endif
mCache->ReleaseZip(this);
NS_ASSERTION(NS_SUCCEEDED(rv), "failed to release zip file");
}
return count;
}
//----------------------------------------------
// nsIZipReader implementation
//----------------------------------------------
NS_IMETHODIMP
nsJAR::Open(nsIFile* zipFile)
{
NS_ENSURE_ARG_POINTER(zipFile);
if (mOpened) return NS_ERROR_FAILURE; // Already open!
mZipFile = zipFile;
mOuterZipEntry.Truncate();
mOpened = true;
// The omnijar is special, it is opened early on and closed late
// this avoids reopening it
nsRefPtr<nsZipArchive> zip = mozilla::Omnijar::GetReader(zipFile);
if (zip) {
mZip = zip;
return NS_OK;
}
return mZip->OpenArchive(zipFile, mCache ? mCache->IsMustCacheFdEnabled() : false);
}
NS_IMETHODIMP
nsJAR::OpenInner(nsIZipReader *aZipReader, const nsACString &aZipEntry)
{
NS_ENSURE_ARG_POINTER(aZipReader);
if (mOpened) return NS_ERROR_FAILURE; // Already open!
bool exist;
nsresult rv = aZipReader->HasEntry(aZipEntry, &exist);
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(exist, NS_ERROR_FILE_NOT_FOUND);
rv = aZipReader->GetFile(getter_AddRefs(mZipFile));
NS_ENSURE_SUCCESS(rv, rv);
mOpened = true;
mOuterZipEntry.Assign(aZipEntry);
nsRefPtr<nsZipHandle> handle;
rv = nsZipHandle::Init(static_cast<nsJAR*>(aZipReader)->mZip.get(), PromiseFlatCString(aZipEntry).get(),
getter_AddRefs(handle));
if (NS_FAILED(rv))
return rv;
return mZip->OpenArchive(handle);
}
NS_IMETHODIMP
nsJAR::GetFile(nsIFile* *result)
{
*result = mZipFile;
NS_IF_ADDREF(*result);
return NS_OK;
}
NS_IMETHODIMP
nsJAR::Close()
{
mOpened = false;
mParsedManifest = false;
mManifestData.Clear();
mGlobalStatus = JAR_MANIFEST_NOT_PARSED;
mTotalItemsInManifest = 0;
nsRefPtr<nsZipArchive> greOmni = mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE);
nsRefPtr<nsZipArchive> appOmni = mozilla::Omnijar::GetReader(mozilla::Omnijar::APP);
if (mZip == greOmni || mZip == appOmni) {
mZip = new nsZipArchive();
return NS_OK;
}
return mZip->CloseArchive();
}
NS_IMETHODIMP
nsJAR::Test(const nsACString &aEntryName)
{
return mZip->Test(aEntryName.IsEmpty()? nullptr : PromiseFlatCString(aEntryName).get());
}
NS_IMETHODIMP
nsJAR::Extract(const nsACString &aEntryName, nsIFile* outFile)
{
// nsZipArchive and zlib are not thread safe
// we need to use a lock to prevent bug #51267
MutexAutoLock lock(mLock);
nsZipItem *item = mZip->GetItem(PromiseFlatCString(aEntryName).get());
NS_ENSURE_TRUE(item, NS_ERROR_FILE_TARGET_DOES_NOT_EXIST);
// Remove existing file or directory so we set permissions correctly.
// If it's a directory that already exists and contains files, throw
// an exception and return.
nsresult rv = outFile->Remove(false);
if (rv == NS_ERROR_FILE_DIR_NOT_EMPTY ||
rv == NS_ERROR_FAILURE)
return rv;
if (item->IsDirectory())
{
rv = outFile->Create(nsIFile::DIRECTORY_TYPE, item->Mode());
//XXX Do this in nsZipArchive? It would be nice to keep extraction
//XXX code completely there, but that would require a way to get a
//XXX PRDir from outFile.
}
else
{
PRFileDesc* fd;
rv = outFile->OpenNSPRFileDesc(PR_WRONLY | PR_CREATE_FILE, item->Mode(), &fd);
if (NS_FAILED(rv)) return rv;
// ExtractFile also closes the fd handle and resolves the symlink if needed
nsAutoCString path;
rv = outFile->GetNativePath(path);
if (NS_FAILED(rv)) return rv;
rv = mZip->ExtractFile(item, path.get(), fd);
}
if (NS_FAILED(rv)) return rv;
// nsIFile needs milliseconds, while prtime is in microseconds.
// non-fatal if this fails, ignore errors
outFile->SetLastModifiedTime(item->LastModTime() / PR_USEC_PER_MSEC);
return NS_OK;
}
NS_IMETHODIMP
nsJAR::GetEntry(const nsACString &aEntryName, nsIZipEntry* *result)
{
nsZipItem* zipItem = mZip->GetItem(PromiseFlatCString(aEntryName).get());
NS_ENSURE_TRUE(zipItem, NS_ERROR_FILE_TARGET_DOES_NOT_EXIST);
nsJARItem* jarItem = new nsJARItem(zipItem);
NS_ADDREF(*result = jarItem);
return NS_OK;
}
NS_IMETHODIMP
nsJAR::HasEntry(const nsACString &aEntryName, bool *result)
{
*result = mZip->GetItem(PromiseFlatCString(aEntryName).get()) != nullptr;
return NS_OK;
}
NS_IMETHODIMP
nsJAR::FindEntries(const nsACString &aPattern, nsIUTF8StringEnumerator **result)
{
NS_ENSURE_ARG_POINTER(result);
nsZipFind *find;
nsresult rv = mZip->FindInit(aPattern.IsEmpty()? nullptr : PromiseFlatCString(aPattern).get(), &find);
NS_ENSURE_SUCCESS(rv, rv);
nsIUTF8StringEnumerator *zipEnum = new nsJAREnumerator(find);
NS_ADDREF(*result = zipEnum);
return NS_OK;
}
NS_IMETHODIMP
nsJAR::GetInputStream(const nsACString &aFilename, nsIInputStream** result)
{
return GetInputStreamWithSpec(EmptyCString(), aFilename, result);
}
NS_IMETHODIMP
nsJAR::GetInputStreamWithSpec(const nsACString& aJarDirSpec,
const nsACString &aEntryName, nsIInputStream** result)
{
NS_ENSURE_ARG_POINTER(result);
// Watch out for the jar:foo.zip!/ (aDir is empty) top-level special case!
nsZipItem *item = nullptr;
const char *entry = PromiseFlatCString(aEntryName).get();
if (*entry) {
// First check if item exists in jar
item = mZip->GetItem(entry);
if (!item) return NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
}
nsJARInputStream* jis = new nsJARInputStream();
// addref now so we can call InitFile/InitDirectory()
NS_ADDREF(*result = jis);
nsresult rv = NS_OK;
if (!item || item->IsDirectory()) {
rv = jis->InitDirectory(this, aJarDirSpec, entry);
} else {
rv = jis->InitFile(this, item);
}
if (NS_FAILED(rv)) {
NS_RELEASE(*result);
}
return rv;
}
NS_IMETHODIMP
nsJAR::GetCertificatePrincipal(const nsACString &aFilename, nsICertificatePrincipal** aPrincipal)
{
//-- Parameter check
if (!aPrincipal)
return NS_ERROR_NULL_POINTER;
*aPrincipal = nullptr;
// Don't check signatures in the omnijar - this is only
// interesting for extensions/XPIs.
nsRefPtr<nsZipArchive> greOmni = mozilla::Omnijar::GetReader(mozilla::Omnijar::GRE);
nsRefPtr<nsZipArchive> appOmni = mozilla::Omnijar::GetReader(mozilla::Omnijar::APP);
if (mZip == greOmni || mZip == appOmni)
return NS_OK;
//-- Parse the manifest
nsresult rv = ParseManifest();
if (NS_FAILED(rv)) return rv;
if (mGlobalStatus == JAR_NO_MANIFEST)
return NS_OK;
int16_t requestedStatus;
if (!aFilename.IsEmpty())
{
//-- Find the item
nsJARManifestItem* manItem = mManifestData.Get(aFilename);
if (!manItem)
return NS_OK;
//-- Verify the item against the manifest
if (!manItem->entryVerified)
{
nsXPIDLCString entryData;
uint32_t entryDataLen;
rv = LoadEntry(aFilename, getter_Copies(entryData), &entryDataLen);
if (NS_FAILED(rv)) return rv;
rv = VerifyEntry(manItem, entryData, entryDataLen);
if (NS_FAILED(rv)) return rv;
}
requestedStatus = manItem->status;
}
else // User wants identity of signer w/o verifying any entries
requestedStatus = mGlobalStatus;
if (requestedStatus != JAR_VALID_MANIFEST)
ReportError(aFilename, requestedStatus);
else // Valid signature
{
*aPrincipal = mPrincipal;
NS_IF_ADDREF(*aPrincipal);
}
return NS_OK;
}
NS_IMETHODIMP
nsJAR::GetManifestEntriesCount(uint32_t* count)
{
*count = mTotalItemsInManifest;
return NS_OK;
}
nsresult
nsJAR::GetJarPath(nsACString& aResult)
{
NS_ENSURE_ARG_POINTER(mZipFile);
return mZipFile->GetNativePath(aResult);
}
nsresult
nsJAR::GetNSPRFileDesc(PRFileDesc** aNSPRFileDesc)
{
if (!aNSPRFileDesc) {
return NS_ERROR_ILLEGAL_VALUE;
}
*aNSPRFileDesc = nullptr;
if (!mZip) {
return NS_ERROR_FAILURE;
}
nsRefPtr<nsZipHandle> handle = mZip->GetFD();
if (!handle) {
return NS_ERROR_FAILURE;
}
return handle->GetNSPRFileDesc(aNSPRFileDesc);
}
//----------------------------------------------
// nsJAR private implementation
//----------------------------------------------
nsresult
nsJAR::LoadEntry(const nsACString &aFilename, char** aBuf, uint32_t* aBufLen)
{
//-- Get a stream for reading the file
nsresult rv;
nsCOMPtr<nsIInputStream> manifestStream;
rv = GetInputStream(aFilename, getter_AddRefs(manifestStream));
if (NS_FAILED(rv)) return NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
//-- Read the manifest file into memory
char* buf;
uint64_t len64;
rv = manifestStream->Available(&len64);
if (NS_FAILED(rv)) return rv;
NS_ENSURE_TRUE(len64 < UINT32_MAX, NS_ERROR_FILE_CORRUPTED); // bug 164695
uint32_t len = (uint32_t)len64;
buf = (char*)malloc(len+1);
if (!buf) return NS_ERROR_OUT_OF_MEMORY;
uint32_t bytesRead;
rv = manifestStream->Read(buf, len, &bytesRead);
if (bytesRead != len)
rv = NS_ERROR_FILE_CORRUPTED;
if (NS_FAILED(rv)) {
free(buf);
return rv;
}
buf[len] = '\0'; //Null-terminate the buffer
*aBuf = buf;
if (aBufLen)
*aBufLen = len;
return NS_OK;
}
int32_t
nsJAR::ReadLine(const char** src)
{
if (!*src) {
return 0;
}
//--Moves pointer to beginning of next line and returns line length
// not including CR/LF.
int32_t length;
char* eol = PL_strpbrk(*src, "\r\n");
if (eol == nullptr) // Probably reached end of file before newline
{
length = strlen(*src);
if (length == 0) // immediate end-of-file
*src = nullptr;
else // some data left on this line
*src += length;
}
else
{
length = eol - *src;
if (eol[0] == '\r' && eol[1] == '\n') // CR LF, so skip 2
*src = eol+2;
else // Either CR or LF, so skip 1
*src = eol+1;
}
return length;
}
//-- The following #defines are used by ParseManifest()
// and ParseOneFile(). The header strings are defined in the JAR specification.
#define JAR_MF 1
#define JAR_SF 2
#define JAR_MF_SEARCH_STRING "(M|/M)ETA-INF/(M|m)(ANIFEST|anifest).(MF|mf)$"
#define JAR_SF_SEARCH_STRING "(M|/M)ETA-INF/*.(SF|sf)$"
#define JAR_MF_HEADER (const char*)"Manifest-Version: 1.0"
#define JAR_SF_HEADER (const char*)"Signature-Version: 1.0"
nsresult
nsJAR::ParseManifest()
{
//-- Verification Step 1
if (mParsedManifest)
return NS_OK;
//-- (1)Manifest (MF) file
nsCOMPtr<nsIUTF8StringEnumerator> files;
nsresult rv = FindEntries(nsDependentCString(JAR_MF_SEARCH_STRING), getter_AddRefs(files));
if (!files) rv = NS_ERROR_FAILURE;
if (NS_FAILED(rv)) return rv;
//-- Load the file into memory
bool more;
rv = files->HasMore(&more);
NS_ENSURE_SUCCESS(rv, rv);
if (!more)
{
mGlobalStatus = JAR_NO_MANIFEST;
mParsedManifest = true;
return NS_OK;
}
nsAutoCString manifestFilename;
rv = files->GetNext(manifestFilename);
NS_ENSURE_SUCCESS(rv, rv);
// Check if there is more than one manifest, if so then error!
rv = files->HasMore(&more);
if (NS_FAILED(rv)) return rv;
if (more)
{
mParsedManifest = true;
return NS_ERROR_FILE_CORRUPTED; // More than one MF file
}
nsXPIDLCString manifestBuffer;
uint32_t manifestLen;
rv = LoadEntry(manifestFilename, getter_Copies(manifestBuffer), &manifestLen);
if (NS_FAILED(rv)) return rv;
//-- Parse it
rv = ParseOneFile(manifestBuffer, JAR_MF);
if (NS_FAILED(rv)) return rv;
//-- (2)Signature (SF) file
// If there are multiple signatures, we select one.
rv = FindEntries(nsDependentCString(JAR_SF_SEARCH_STRING), getter_AddRefs(files));
if (!files) rv = NS_ERROR_FAILURE;
if (NS_FAILED(rv)) return rv;
//-- Get an SF file
rv = files->HasMore(&more);
if (NS_FAILED(rv)) return rv;
if (!more)
{
mGlobalStatus = JAR_NO_MANIFEST;
mParsedManifest = true;
return NS_OK;
}
rv = files->GetNext(manifestFilename);
if (NS_FAILED(rv)) return rv;
rv = LoadEntry(manifestFilename, getter_Copies(manifestBuffer), &manifestLen);
if (NS_FAILED(rv)) return rv;
//-- Get its corresponding signature file
nsAutoCString sigFilename(manifestFilename);
int32_t extension = sigFilename.RFindChar('.') + 1;
NS_ASSERTION(extension != 0, "Manifest Parser: Missing file extension.");
(void)sigFilename.Cut(extension, 2);
nsXPIDLCString sigBuffer;
uint32_t sigLen;
{
nsAutoCString tempFilename(sigFilename); tempFilename.Append("rsa", 3);
rv = LoadEntry(tempFilename, getter_Copies(sigBuffer), &sigLen);
}
if (NS_FAILED(rv))
{
nsAutoCString tempFilename(sigFilename); tempFilename.Append("RSA", 3);
rv = LoadEntry(tempFilename, getter_Copies(sigBuffer), &sigLen);
}
if (NS_FAILED(rv))
{
mGlobalStatus = JAR_NO_MANIFEST;
mParsedManifest = true;
return NS_OK;
}
//-- Get the signature verifier service
nsCOMPtr<nsIDataSignatureVerifier> verifier(
do_GetService("@mozilla.org/security/datasignatureverifier;1", &rv));
if (NS_FAILED(rv)) // No signature verifier available
{
mGlobalStatus = JAR_NO_MANIFEST;
mParsedManifest = true;
return NS_OK;
}
//-- Verify that the signature file is a valid signature of the SF file
int32_t verifyError;
rv = verifier->VerifySignature(sigBuffer, sigLen, manifestBuffer, manifestLen,
&verifyError, getter_AddRefs(mPrincipal));
if (NS_FAILED(rv)) return rv;
if (mPrincipal && verifyError == nsIDataSignatureVerifier::VERIFY_OK)
mGlobalStatus = JAR_VALID_MANIFEST;
else if (verifyError == nsIDataSignatureVerifier::VERIFY_ERROR_UNKNOWN_ISSUER)
mGlobalStatus = JAR_INVALID_UNKNOWN_CA;
else
mGlobalStatus = JAR_INVALID_SIG;
//-- Parse the SF file. If the verification above failed, principal
// is null, and ParseOneFile will mark the relevant entries as invalid.
// if ParseOneFile fails, then it has no effect, and we can safely
// continue to the next SF file, or return.
ParseOneFile(manifestBuffer, JAR_SF);
mParsedManifest = true;
return NS_OK;
}
nsresult
nsJAR::ParseOneFile(const char* filebuf, int16_t aFileType)
{
//-- Check file header
const char* nextLineStart = filebuf;
nsAutoCString curLine;
int32_t linelen;
linelen = ReadLine(&nextLineStart);
curLine.Assign(filebuf, linelen);
if ( ((aFileType == JAR_MF) && !curLine.Equals(JAR_MF_HEADER) ) ||
((aFileType == JAR_SF) && !curLine.Equals(JAR_SF_HEADER) ) )
return NS_ERROR_FILE_CORRUPTED;
//-- Skip header section
do {
linelen = ReadLine(&nextLineStart);
} while (linelen > 0);
//-- Set up parsing variables
const char* curPos;
const char* sectionStart = nextLineStart;
nsJARManifestItem* curItemMF = nullptr;
bool foundName = false;
if (aFileType == JAR_MF) {
curItemMF = new nsJARManifestItem();
}
nsAutoCString curItemName;
nsAutoCString storedSectionDigest;
for(;;)
{
curPos = nextLineStart;
linelen = ReadLine(&nextLineStart);
curLine.Assign(curPos, linelen);
if (linelen == 0)
// end of section (blank line or end-of-file)
{
if (aFileType == JAR_MF)
{
mTotalItemsInManifest++;
if (curItemMF->mType != JAR_INVALID)
{
//-- Did this section have a name: line?
if(!foundName)
curItemMF->mType = JAR_INVALID;
else
{
//-- If it's an internal item, it must correspond
// to a valid jar entry
if (curItemMF->mType == JAR_INTERNAL)
{
bool exists;
nsresult rv = HasEntry(curItemName, &exists);
if (NS_FAILED(rv) || !exists)
curItemMF->mType = JAR_INVALID;
}
//-- Check for duplicates
if (mManifestData.Contains(curItemName)) {
curItemMF->mType = JAR_INVALID;
}
}
}
if (curItemMF->mType == JAR_INVALID)
delete curItemMF;
else //-- calculate section digest
{
uint32_t sectionLength = curPos - sectionStart;
CalculateDigest(sectionStart, sectionLength,
curItemMF->calculatedSectionDigest);
//-- Save item in the hashtable
mManifestData.Put(curItemName, curItemMF);
}
if (nextLineStart == nullptr) // end-of-file
break;
sectionStart = nextLineStart;
curItemMF = new nsJARManifestItem();
} // (aFileType == JAR_MF)
else
//-- file type is SF, compare digest with calculated
// section digests from MF file.
{
if (foundName)
{
nsJARManifestItem* curItemSF = mManifestData.Get(curItemName);
if(curItemSF)
{
NS_ASSERTION(curItemSF->status == JAR_NOT_SIGNED,
"SECURITY ERROR: nsJARManifestItem not correctly initialized");
curItemSF->status = mGlobalStatus;
if (curItemSF->status == JAR_VALID_MANIFEST)
{ // Compare digests
if (storedSectionDigest.IsEmpty())
curItemSF->status = JAR_NOT_SIGNED;
else
{
if (!storedSectionDigest.Equals(curItemSF->calculatedSectionDigest))
curItemSF->status = JAR_INVALID_MANIFEST;
curItemSF->calculatedSectionDigest.Truncate();
storedSectionDigest.Truncate();
}
} // (aPrincipal != nullptr)
} // if(curItemSF)
} // if(foundName)
if(nextLineStart == nullptr) // end-of-file
break;
} // aFileType == JAR_SF
foundName = false;
continue;
} // if(linelen == 0)
//-- Look for continuations (beginning with a space) on subsequent lines
// and append them to the current line.
while(*nextLineStart == ' ')
{
curPos = nextLineStart;
int32_t continuationLen = ReadLine(&nextLineStart) - 1;
nsAutoCString continuation(curPos+1, continuationLen);
curLine += continuation;
linelen += continuationLen;
}
//-- Find colon in current line, this separates name from value
int32_t colonPos = curLine.FindChar(':');
if (colonPos == -1) // No colon on line, ignore line
continue;
//-- Break down the line
nsAutoCString lineName;
curLine.Left(lineName, colonPos);
nsAutoCString lineData;
curLine.Mid(lineData, colonPos+2, linelen - (colonPos+2));
//-- Lines to look for:
// (1) Digest:
if (lineName.LowerCaseEqualsLiteral("sha1-digest"))
//-- This is a digest line, save the data in the appropriate place
{
if(aFileType == JAR_MF)
curItemMF->storedEntryDigest = lineData;
else
storedSectionDigest = lineData;
continue;
}
// (2) Name: associates this manifest section with a file in the jar.
if (!foundName && lineName.LowerCaseEqualsLiteral("name"))
{
curItemName = lineData;
foundName = true;
continue;
}
// (3) Magic: this may be an inline Javascript.
// We can't do any other kind of magic.
if (aFileType == JAR_MF && lineName.LowerCaseEqualsLiteral("magic"))
{
if (lineData.LowerCaseEqualsLiteral("javascript"))
curItemMF->mType = JAR_EXTERNAL;
else
curItemMF->mType = JAR_INVALID;
continue;
}
} // for (;;)
return NS_OK;
} //ParseOneFile()
nsresult
nsJAR::VerifyEntry(nsJARManifestItem* aManItem, const char* aEntryData,
uint32_t aLen)
{
if (aManItem->status == JAR_VALID_MANIFEST)
{
if (aManItem->storedEntryDigest.IsEmpty())
// No entry digests in manifest file. Entry is unsigned.
aManItem->status = JAR_NOT_SIGNED;
else
{ //-- Calculate and compare digests
nsCString calculatedEntryDigest;
nsresult rv = CalculateDigest(aEntryData, aLen, calculatedEntryDigest);
if (NS_FAILED(rv)) return NS_ERROR_FAILURE;
if (!aManItem->storedEntryDigest.Equals(calculatedEntryDigest))
aManItem->status = JAR_INVALID_ENTRY;
aManItem->storedEntryDigest.Truncate();
}
}
aManItem->entryVerified = true;
return NS_OK;
}
void nsJAR::ReportError(const nsACString &aFilename, int16_t errorCode)
{
//-- Generate error message
nsAutoString message;
message.AssignLiteral("Signature Verification Error: the signature on ");
if (!aFilename.IsEmpty())
AppendASCIItoUTF16(aFilename, message);
else
message.AppendLiteral("this .jar archive");
message.AppendLiteral(" is invalid because ");
switch(errorCode)
{
case JAR_NOT_SIGNED:
message.AppendLiteral("the archive did not contain a valid PKCS7 signature.");
break;
case JAR_INVALID_SIG:
message.AppendLiteral("the digital signature (*.RSA) file is not a valid signature of the signature instruction file (*.SF).");
break;
case JAR_INVALID_UNKNOWN_CA:
message.AppendLiteral("the certificate used to sign this file has an unrecognized issuer.");
break;
case JAR_INVALID_MANIFEST:
message.AppendLiteral("the signature instruction file (*.SF) does not contain a valid hash of the MANIFEST.MF file.");
break;
case JAR_INVALID_ENTRY:
message.AppendLiteral("the MANIFEST.MF file does not contain a valid hash of the file being verified.");
break;
case JAR_NO_MANIFEST:
message.AppendLiteral("the archive did not contain a manifest.");
break;
default:
message.AppendLiteral("of an unknown problem.");
}
// Report error in JS console
nsCOMPtr<nsIConsoleService> console(do_GetService("@mozilla.org/consoleservice;1"));
if (console)
{
console->LogStringMessage(message.get());
}
#ifdef DEBUG
char* messageCstr = ToNewCString(message);
if (!messageCstr) return;
fprintf(stderr, "%s\n", messageCstr);
nsMemory::Free(messageCstr);
#endif
}
nsresult nsJAR::CalculateDigest(const char* aInBuf, uint32_t aLen,
nsCString& digest)
{
nsresult rv;
nsCOMPtr<nsICryptoHash> hasher = do_CreateInstance("@mozilla.org/security/hash;1", &rv);
if (NS_FAILED(rv)) return rv;
rv = hasher->Init(nsICryptoHash::SHA1);
if (NS_FAILED(rv)) return rv;
rv = hasher->Update((const uint8_t*) aInBuf, aLen);
if (NS_FAILED(rv)) return rv;
return hasher->Finish(true, digest);
}
NS_IMPL_ISUPPORTS(nsJAREnumerator, nsIUTF8StringEnumerator)
//----------------------------------------------
// nsJAREnumerator::HasMore
//----------------------------------------------
NS_IMETHODIMP
nsJAREnumerator::HasMore(bool* aResult)
{
// try to get the next element
if (!mName) {
NS_ASSERTION(mFind, "nsJAREnumerator: Missing zipFind.");
nsresult rv = mFind->FindNext( &mName, &mNameLen );
if (rv == NS_ERROR_FILE_TARGET_DOES_NOT_EXIST) {
*aResult = false; // No more matches available
return NS_OK;
}
NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE); // no error translation
}
*aResult = true;
return NS_OK;
}
//----------------------------------------------
// nsJAREnumerator::GetNext
//----------------------------------------------
NS_IMETHODIMP
nsJAREnumerator::GetNext(nsACString& aResult)
{
// check if the current item is "stale"
if (!mName) {
bool bMore;
nsresult rv = HasMore(&bMore);
if (NS_FAILED(rv) || !bMore)
return NS_ERROR_FAILURE; // no error translation
}
aResult.Assign(mName, mNameLen);
mName = 0; // we just gave this one away
return NS_OK;
}
NS_IMPL_ISUPPORTS(nsJARItem, nsIZipEntry)
nsJARItem::nsJARItem(nsZipItem* aZipItem)
: mSize(aZipItem->Size()),
mRealsize(aZipItem->RealSize()),
mCrc32(aZipItem->CRC32()),
mLastModTime(aZipItem->LastModTime()),
mCompression(aZipItem->Compression()),
mPermissions(aZipItem->Mode()),
mIsDirectory(aZipItem->IsDirectory()),
mIsSynthetic(aZipItem->isSynthetic)
{
}
//------------------------------------------
// nsJARItem::GetCompression
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetCompression(uint16_t *aCompression)
{
NS_ENSURE_ARG_POINTER(aCompression);
*aCompression = mCompression;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetSize
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetSize(uint32_t *aSize)
{
NS_ENSURE_ARG_POINTER(aSize);
*aSize = mSize;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetRealSize
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetRealSize(uint32_t *aRealsize)
{
NS_ENSURE_ARG_POINTER(aRealsize);
*aRealsize = mRealsize;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetCrc32
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetCRC32(uint32_t *aCrc32)
{
NS_ENSURE_ARG_POINTER(aCrc32);
*aCrc32 = mCrc32;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetIsDirectory
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetIsDirectory(bool *aIsDirectory)
{
NS_ENSURE_ARG_POINTER(aIsDirectory);
*aIsDirectory = mIsDirectory;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetIsSynthetic
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetIsSynthetic(bool *aIsSynthetic)
{
NS_ENSURE_ARG_POINTER(aIsSynthetic);
*aIsSynthetic = mIsSynthetic;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetLastModifiedTime
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetLastModifiedTime(PRTime* aLastModTime)
{
NS_ENSURE_ARG_POINTER(aLastModTime);
*aLastModTime = mLastModTime;
return NS_OK;
}
//------------------------------------------
// nsJARItem::GetPermissions
//------------------------------------------
NS_IMETHODIMP
nsJARItem::GetPermissions(uint32_t* aPermissions)
{
NS_ENSURE_ARG_POINTER(aPermissions);
*aPermissions = mPermissions;
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
// nsIZipReaderCache
NS_IMPL_ISUPPORTS(nsZipReaderCache, nsIZipReaderCache, nsIObserver, nsISupportsWeakReference)
nsZipReaderCache::nsZipReaderCache()
: mLock("nsZipReaderCache.mLock")
, mZips(16)
, mMustCacheFd(false)
#ifdef ZIP_CACHE_HIT_RATE
,
mZipCacheLookups(0),
mZipCacheHits(0),
mZipCacheFlushes(0),
mZipSyncMisses(0)
#endif
{
}
NS_IMETHODIMP
nsZipReaderCache::Init(uint32_t cacheSize)
{
mCacheSize = cacheSize;
// Register as a memory pressure observer
nsCOMPtr<nsIObserverService> os =
do_GetService("@mozilla.org/observer-service;1");
if (os)
{
os->AddObserver(this, "memory-pressure", true);
os->AddObserver(this, "chrome-flush-caches", true);
os->AddObserver(this, "flush-cache-entry", true);
}
// ignore failure of the observer registration.
return NS_OK;
}
static PLDHashOperator
DropZipReaderCache(const nsACString &aKey, nsJAR* aZip, void*)
{
aZip->SetZipReaderCache(nullptr);
return PL_DHASH_NEXT;
}
nsZipReaderCache::~nsZipReaderCache()
{
mZips.EnumerateRead(DropZipReaderCache, nullptr);
#ifdef ZIP_CACHE_HIT_RATE
printf("nsZipReaderCache size=%d hits=%d lookups=%d rate=%f%% flushes=%d missed %d\n",
mCacheSize, mZipCacheHits, mZipCacheLookups,
(float)mZipCacheHits / mZipCacheLookups,
mZipCacheFlushes, mZipSyncMisses);
#endif
}
NS_IMETHODIMP
nsZipReaderCache::IsCached(nsIFile* zipFile, bool* aResult)
{
NS_ENSURE_ARG_POINTER(zipFile);
nsresult rv;
nsCOMPtr<nsIZipReader> antiLockZipGrip;
MutexAutoLock lock(mLock);
nsAutoCString uri;
rv = zipFile->GetNativePath(uri);
if (NS_FAILED(rv))
return rv;
uri.Insert(NS_LITERAL_CSTRING("file:"), 0);
*aResult = mZips.Contains(uri);
return NS_OK;
}
NS_IMETHODIMP
nsZipReaderCache::GetZip(nsIFile* zipFile, nsIZipReader* *result)
{
NS_ENSURE_ARG_POINTER(zipFile);
nsresult rv;
nsCOMPtr<nsIZipReader> antiLockZipGrip;
MutexAutoLock lock(mLock);
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheLookups++;
#endif
nsAutoCString uri;
rv = zipFile->GetNativePath(uri);
if (NS_FAILED(rv)) return rv;
uri.Insert(NS_LITERAL_CSTRING("file:"), 0);
nsRefPtr<nsJAR> zip;
mZips.Get(uri, getter_AddRefs(zip));
if (zip) {
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheHits++;
#endif
zip->ClearReleaseTime();
} else {
zip = new nsJAR();
zip->SetZipReaderCache(this);
rv = zip->Open(zipFile);
if (NS_FAILED(rv)) {
return rv;
}
MOZ_ASSERT(!mZips.Contains(uri));
mZips.Put(uri, zip);
}
zip.forget(result);
return rv;
}
NS_IMETHODIMP
nsZipReaderCache::GetInnerZip(nsIFile* zipFile, const nsACString &entry,
nsIZipReader* *result)
{
NS_ENSURE_ARG_POINTER(zipFile);
nsCOMPtr<nsIZipReader> outerZipReader;
nsresult rv = GetZip(zipFile, getter_AddRefs(outerZipReader));
NS_ENSURE_SUCCESS(rv, rv);
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheLookups++;
#endif
nsAutoCString uri;
rv = zipFile->GetNativePath(uri);
if (NS_FAILED(rv)) return rv;
uri.Insert(NS_LITERAL_CSTRING("jar:"), 0);
uri.AppendLiteral("!/");
uri.Append(entry);
nsRefPtr<nsJAR> zip;
mZips.Get(uri, getter_AddRefs(zip));
if (zip) {
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheHits++;
#endif
zip->ClearReleaseTime();
} else {
zip = new nsJAR();
zip->SetZipReaderCache(this);
rv = zip->OpenInner(outerZipReader, entry);
if (NS_FAILED(rv)) {
return rv;
}
MOZ_ASSERT(!mZips.Contains(uri));
mZips.Put(uri, zip);
}
zip.forget(result);
return rv;
}
NS_IMETHODIMP
nsZipReaderCache::SetMustCacheFd(nsIFile* zipFile, bool aMustCacheFd)
{
#if defined(XP_WIN)
MOZ_CRASH("Not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
mMustCacheFd = aMustCacheFd;
if (!aMustCacheFd) {
return NS_OK;
}
if (!zipFile) {
return NS_ERROR_FAILURE;
}
nsresult rv;
nsAutoCString uri;
rv = zipFile->GetNativePath(uri);
if (NS_FAILED(rv)) {
return rv;
}
uri.Insert(NS_LITERAL_CSTRING("file:"), 0);
MutexAutoLock lock(mLock);
nsRefPtr<nsJAR> zip;
mZips.Get(uri, getter_AddRefs(zip));
if (!zip) {
return NS_ERROR_FAILURE;
}
// Flush the file from the cache if its file descriptor was not cached.
PRFileDesc* fd = nullptr;
zip->GetNSPRFileDesc(&fd);
if (!fd) {
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheFlushes++;
#endif
zip->SetZipReaderCache(nullptr);
mZips.Remove(uri);
}
return NS_OK;
#endif /* XP_WIN */
}
NS_IMETHODIMP
nsZipReaderCache::GetFd(nsIFile* zipFile, PRFileDesc** aRetVal)
{
#if defined(XP_WIN)
MOZ_CRASH("Not implemented");
return NS_ERROR_NOT_IMPLEMENTED;
#else
if (!zipFile) {
return NS_ERROR_FAILURE;
}
nsresult rv;
nsAutoCString uri;
rv = zipFile->GetNativePath(uri);
if (NS_FAILED(rv)) {
return rv;
}
uri.Insert(NS_LITERAL_CSTRING("file:"), 0);
MutexAutoLock lock(mLock);
nsRefPtr<nsJAR> zip;
mZips.Get(uri, getter_AddRefs(zip));
if (!zip) {
return NS_ERROR_FAILURE;
}
zip->ClearReleaseTime();
rv = zip->GetNSPRFileDesc(aRetVal);
// Do this to avoid possible deadlock on mLock with ReleaseZip().
MutexAutoUnlock unlock(mLock);
nsRefPtr<nsJAR> zipTemp = zip.forget();
return rv;
#endif /* XP_WIN */
}
static PLDHashOperator
FindOldestZip(const nsACString &aKey, nsJAR* aZip, void* aClosure)
{
nsJAR** oldestPtr = static_cast<nsJAR**>(aClosure);
nsJAR* oldest = *oldestPtr;
nsJAR* current = aZip;
PRIntervalTime currentReleaseTime = current->GetReleaseTime();
if (currentReleaseTime != PR_INTERVAL_NO_TIMEOUT) {
if (oldest == nullptr ||
currentReleaseTime < oldest->GetReleaseTime()) {
*oldestPtr = current;
}
}
return PL_DHASH_NEXT;
}
struct ZipFindData {nsJAR* zip; bool found;};
static PLDHashOperator
FindZip(const nsACString &aKey, nsJAR* aZip, void* aClosure)
{
ZipFindData* find_data = static_cast<ZipFindData*>(aClosure);
if (find_data->zip == aZip) {
find_data->found = true;
return PL_DHASH_STOP;
}
return PL_DHASH_NEXT;
}
nsresult
nsZipReaderCache::ReleaseZip(nsJAR* zip)
{
nsresult rv;
MutexAutoLock lock(mLock);
// It is possible that two thread compete for this zip. The dangerous
// case is where one thread Releases the zip and discovers that the ref
// count has gone to one. Before it can call this ReleaseZip method
// another thread calls our GetZip method. The ref count goes to two. That
// second thread then Releases the zip and the ref count goes to one. It
// then tries to enter this ReleaseZip method and blocks while the first
// thread is still here. The first thread continues and remove the zip from
// the cache and calls its Release method sending the ref count to 0 and
// deleting the zip. However, the second thread is still blocked at the
// start of ReleaseZip, but the 'zip' param now hold a reference to a
// deleted zip!
//
// So, we are going to try safeguarding here by searching our hashtable while
// locked here for the zip. We return fast if it is not found.
ZipFindData find_data = {zip, false};
mZips.EnumerateRead(FindZip, &find_data);
if (!find_data.found) {
#ifdef ZIP_CACHE_HIT_RATE
mZipSyncMisses++;
#endif
return NS_OK;
}
zip->SetReleaseTime();
if (mZips.Count() <= mCacheSize)
return NS_OK;
nsJAR* oldest = nullptr;
mZips.EnumerateRead(FindOldestZip, &oldest);
// Because of the craziness above it is possible that there is no zip that
// needs removing.
if (!oldest)
return NS_OK;
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheFlushes++;
#endif
// remove from hashtable
nsAutoCString uri;
rv = oldest->GetJarPath(uri);
if (NS_FAILED(rv))
return rv;
if (oldest->mOuterZipEntry.IsEmpty()) {
uri.Insert(NS_LITERAL_CSTRING("file:"), 0);
} else {
uri.Insert(NS_LITERAL_CSTRING("jar:"), 0);
uri.AppendLiteral("!/");
uri.Append(oldest->mOuterZipEntry);
}
// Retrieving and removing the JAR must be done without an extra AddRef
// and Release, or we'll trigger nsJAR::Release's magic refcount 1 case
// an extra time and trigger a deadlock.
nsRefPtr<nsJAR> removed;
mZips.Remove(uri, getter_AddRefs(removed));
NS_ASSERTION(removed, "botched");
NS_ASSERTION(oldest == removed, "removed wrong entry");
if (removed)
removed->SetZipReaderCache(nullptr);
return NS_OK;
}
static PLDHashOperator
FindFlushableZip(const nsACString &aKey, nsRefPtr<nsJAR>& aCurrent, void*)
{
if (aCurrent->GetReleaseTime() != PR_INTERVAL_NO_TIMEOUT) {
aCurrent->SetZipReaderCache(nullptr);
return PL_DHASH_REMOVE;
}
return PL_DHASH_NEXT;
}
NS_IMETHODIMP
nsZipReaderCache::Observe(nsISupports *aSubject,
const char *aTopic,
const char16_t *aSomeData)
{
if (strcmp(aTopic, "memory-pressure") == 0) {
MutexAutoLock lock(mLock);
mZips.Enumerate(FindFlushableZip, nullptr);
}
else if (strcmp(aTopic, "chrome-flush-caches") == 0) {
mZips.EnumerateRead(DropZipReaderCache, nullptr);
mZips.Clear();
}
else if (strcmp(aTopic, "flush-cache-entry") == 0) {
nsCOMPtr<nsIFile> file = do_QueryInterface(aSubject);
if (!file)
return NS_OK;
nsAutoCString uri;
if (NS_FAILED(file->GetNativePath(uri)))
return NS_OK;
uri.Insert(NS_LITERAL_CSTRING("file:"), 0);
MutexAutoLock lock(mLock);
nsRefPtr<nsJAR> zip;
mZips.Get(uri, getter_AddRefs(zip));
if (!zip)
return NS_OK;
#ifdef ZIP_CACHE_HIT_RATE
mZipCacheFlushes++;
#endif
zip->SetZipReaderCache(nullptr);
mZips.Remove(uri);
}
return NS_OK;
}
////////////////////////////////////////////////////////////////////////////////
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