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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 "CredentialManagerSecret.h"
#include <windows.h>
#include <wincred.h>
#include "mozilla/Logging.h"
#include "mozilla/SyncRunnable.h"
// This is the implementation of CredentialManagerSecretSecret, an instantiation
// of OSKeyStore for Windows. It uses the system credential manager, hence the
// name.
using namespace mozilla;
LazyLogModule gCredentialManagerSecretLog("credentialmanagersecret");
struct ScopedDelete {
void operator()(CREDENTIALA* cred) { CredFree(cred); }
};
template <class T>
struct ScopedMaybeDelete {
void operator()(T* ptr) {
if (ptr) {
ScopedDelete del;
del(ptr);
}
}
};
typedef std::unique_ptr<CREDENTIALA, ScopedMaybeDelete<CREDENTIALA>>
ScopedCREDENTIALA;
CredentialManagerSecret::CredentialManagerSecret() {}
CredentialManagerSecret::~CredentialManagerSecret() {}
nsresult CredentialManagerSecret::Lock() {
// The Windows credential manager can't be locked.
return NS_OK;
}
nsresult CredentialManagerSecret::Unlock() {
// The Windows credential manager is always unlocked when the user is logged
// in.
return NS_OK;
}
nsresult CredentialManagerSecret::StoreSecret(const nsACString& aSecret,
const nsACString& aLabel) {
if (aSecret.Length() > CRED_MAX_CREDENTIAL_BLOB_SIZE) {
// Windows doesn't allow blobs larger than CRED_MAX_CREDENTIAL_BLOB_SIZE
// bytes.
MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
("StoreSecret secret must not be larger than 512 bytes (got %d)",
aSecret.Length()));
return NS_ERROR_FAILURE;
}
CREDENTIALA cred = {0};
cred.Type = CRED_TYPE_GENERIC;
const nsCString& label = PromiseFlatCString(aLabel);
cred.TargetName = const_cast<LPSTR>(label.get());
cred.CredentialBlobSize = aSecret.Length();
const nsCString& secret = PromiseFlatCString(aSecret);
cred.CredentialBlob = (LPBYTE)secret.get();
cred.Persist = CRED_PERSIST_LOCAL_MACHINE;
cred.UserName = const_cast<char*>(""); // -Wwritable-strings
// https://docs.microsoft.com/en-us/windows/desktop/api/wincred/nf-wincred-credwritea
BOOL ok = CredWriteA(&cred, 0);
if (!ok) {
MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
("CredWriteW failed %d", GetLastError()));
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult CredentialManagerSecret::DeleteSecret(const nsACString& aLabel) {
// https://docs.microsoft.com/en-us/windows/desktop/api/wincred/nf-wincred-creddeletea
const nsCString& label = PromiseFlatCString(aLabel);
BOOL ok = CredDeleteA(label.get(), CRED_TYPE_GENERIC, 0);
int error = GetLastError();
if (!ok && error != ERROR_NOT_FOUND) {
MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
("CredDeleteA failed %d", error));
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult CredentialManagerSecret::RetrieveSecret(
const nsACString& aLabel,
/* out */ nsACString& aSecret) {
aSecret.Truncate();
PCREDENTIALA pcred_raw = nullptr;
const nsCString& label = PromiseFlatCString(aLabel);
// https://docs.microsoft.com/en-us/windows/desktop/api/wincred/nf-wincred-credreada
BOOL ok = CredReadA(label.get(), CRED_TYPE_GENERIC, 0, &pcred_raw);
ScopedCREDENTIALA pcred(pcred_raw);
if (!ok) {
MOZ_LOG(gCredentialManagerSecretLog, LogLevel::Debug,
("CredReadA failed %d", GetLastError()));
return NS_ERROR_FAILURE;
}
MOZ_ASSERT(pcred);
aSecret.Assign(reinterpret_cast<const char*>(pcred->CredentialBlob),
pcred->CredentialBlobSize);
return NS_OK;
}
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