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Backing out part of bug 369428 that seems to be causing unit test failures

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dtownsend@oxymoronical.com 2007-10-12 07:30:34 -07:00
parent 2bf5706a7b
commit 1b0518d3eb
1 changed files with 27 additions and 43 deletions
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70
uriloader/exthandler/nsExternalHelperAppService.cpp
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@ -120,10 +120,6 @@
#include "nsLocalHandlerApp.h"
#include "nsIRandomGenerator.h"
#include "plbase64.h"
#include "prmem.h"
#ifdef PR_LOGGING
PRLogModuleInfo* nsExternalHelperAppService::mLog = nsnull;
#endif
@ -1077,6 +1073,14 @@ void nsExternalAppHandler::RetargetLoadNotifications(nsIRequest *request)
}
#define SALT_SIZE 8
#define TABLE_SIZE 36
const PRUnichar table[] =
{ 'a','b','c','d','e','f','g','h','i','j',
'k','l','m','n','o','p','q','r','s','t',
'u','v','w','x','y','z','0','1','2','3',
'4','5','6','7','8','9'};
/**
* Make mTempFileExtension contain an extension exactly when its previous value
* is different from mSuggestedFileName's extension, so that it can be appended
@ -1128,56 +1132,36 @@ nsresult nsExternalAppHandler::SetUpTempFile(nsIChannel * aChannel)
#endif
NS_ENSURE_SUCCESS(rv, rv);
// At this point, we do not have a filename for the temp file. For security
// purposes, this cannot be predictable, so we must use a cryptographic
// quality PRNG to generate one.
// We will request raw random bytes, and transform that to a base64 string,
// as all characters from the base64 set are acceptable for filenames. For
// each three bytes of random data, we will get four bytes of ASCII. Request
// a bit more, to be safe, and truncate to the length we want in the end.
const PRUint32 wantedFileNameLength = 8;
const PRUint32 requiredBytesLength =
static_cast<PRUint32>((wantedFileNameLength + 1) / 4 * 3);
nsCOMPtr<nsIRandomGenerator> rg =
do_GetService("@mozilla.org/security/random-generator;1", &rv);
NS_ENSURE_SUCCESS(rv, rv);
PRUint8 *buffer;
rv = rg->GenerateRandomBytes(requiredBytesLength, &buffer);
NS_ENSURE_SUCCESS(rv, rv);
char *b64 = PL_Base64Encode(reinterpret_cast<const char *>(buffer),
requiredBytesLength, nsnull);
NS_Free(buffer);
buffer = nsnull;
if (!b64)
return NS_ERROR_OUT_OF_MEMORY;
NS_ASSERTION(strlen(b64) >= wantedFileNameLength,
"not enough bytes produced for conversion!");
nsCAutoString tempLeafName(b64, wantedFileNameLength);
PR_Free(b64);
b64 = nsnull;
// We need to generate a name for the temp file that we are going to be streaming data to.
// We don't want this name to be predictable for security reasons so we are going to generate a
// "salted" name.....
nsAutoString saltedTempLeafName;
// this salting code was ripped directly from the profile manager.
// turn PR_Now() into milliseconds since epoch
// and salt rand with that.
double fpTime;
LL_L2D(fpTime, PR_Now());
srand((uint)(fpTime * 1e-6 + 0.5));
PRInt32 i;
for (i=0;i<SALT_SIZE;i++)
{
saltedTempLeafName.Append(table[(rand()%TABLE_SIZE)]);
}
// now append our extension.
nsCAutoString ext;
mMimeInfo->GetPrimaryExtension(ext);
if (!ext.IsEmpty()) {
if (ext.First() != '.')
tempLeafName.Append('.');
tempLeafName.Append(ext);
saltedTempLeafName.Append(PRUnichar('.'));
AppendUTF8toUTF16(ext, saltedTempLeafName);
}
// Add an additional .part to prevent the OS from running this file in the
// default application.
tempLeafName.Append(NS_LITERAL_CSTRING(".part"));
saltedTempLeafName.Append(NS_LITERAL_STRING(".part"));
mTempFile->Append(NS_ConvertUTF8toUTF16(tempLeafName));
// make this file unique!!!
mTempFile->Append(saltedTempLeafName); // make this file unique!!!
mTempFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
#ifdef XP_MACOSX