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fune/netwerk/protocol/http/nsHttpNTLMAuth.cpp
Dipen Patel 7641beb1f8 Bug 1475647 - Remove nsISSLStatusProvider interface. r=baku,Gijs,jchen,jryans,keeler,mcmanus 
- Access nsISSLStatus directly as a member of nsITransportSecurityInfo
and nsISecureBrowserUI.  This is part of a larger effort to consolidate
nsISSLStatus and nsITransportSecurityInfo.
- The TabParent implementation of GetSecInfo will always return null.
- Removed unnecessary QueryInterface calls
- Style adherence updates

MozReview-Commit-ID: Dzy6t2zYljL

--HG--
extra : rebase_source : 9c400bed3c9d29a186fc987c9bd0ffceb37bfd94
2018-07-13 11:48:55 -07:00

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/* vim:set ts=4 sw=4 sts=4 et ci: */
/* 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/. */
// HttpLog.h should generally be included first
#include "HttpLog.h"
#include "nsHttpNTLMAuth.h"
#include "nsIAuthModule.h"
#include "nsCOMPtr.h"
#include "nsServiceManagerUtils.h"
#include "plbase64.h"
#include "plstr.h"
#include "prnetdb.h"
//-----------------------------------------------------------------------------
#include "nsIPrefBranch.h"
#include "nsIPrefService.h"
#include "nsIHttpAuthenticableChannel.h"
#include "nsIURI.h"
#ifdef XP_WIN
#include "nsIChannel.h"
#include "nsIX509Cert.h"
#include "nsISSLStatus.h"
#include "nsITransportSecurityInfo.h"
#endif
#include "mozilla/Attributes.h"
#include "mozilla/Base64.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/Tokenizer.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/Unused.h"
#include "nsNetUtil.h"
#include "nsIChannel.h"
#include "nsUnicharUtils.h"
#include "mozilla/net/HttpAuthUtils.h"
namespace mozilla {
namespace net {
static const char kAllowProxies[] = "network.automatic-ntlm-auth.allow-proxies";
static const char kAllowNonFqdn[] = "network.automatic-ntlm-auth.allow-non-fqdn";
static const char kTrustedURIs[] = "network.automatic-ntlm-auth.trusted-uris";
static const char kForceGeneric[] = "network.auth.force-generic-ntlm";
static const char kSSOinPBmode[] = "network.auth.private-browsing-sso";
static bool
IsNonFqdn(nsIURI *uri)
{
nsAutoCString host;
PRNetAddr addr;
if (NS_FAILED(uri->GetAsciiHost(host)))
return false;
// return true if host does not contain a dot and is not an ip address
return !host.IsEmpty() && !host.Contains('.') &&
PR_StringToNetAddr(host.BeginReading(), &addr) != PR_SUCCESS;
}
// Check to see if we should use our generic (internal) NTLM auth module.
static bool
ForceGenericNTLM()
{
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!prefs)
return false;
bool flag = false;
if (NS_FAILED(prefs->GetBoolPref(kForceGeneric, &flag)))
flag = false;
LOG(("Force use of generic ntlm auth module: %d\n", flag));
return flag;
}
// Check to see if we should use default credentials for this host or proxy.
static bool
CanUseDefaultCredentials(nsIHttpAuthenticableChannel *channel,
bool isProxyAuth)
{
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (!prefs) {
return false;
}
// Proxy should go all the time, it's not considered a privacy leak
// to send default credentials to a proxy.
if (isProxyAuth) {
bool val;
if (NS_FAILED(prefs->GetBoolPref(kAllowProxies, &val)))
val = false;
LOG(("Default credentials allowed for proxy: %d\n", val));
return val;
}
// Prevent using default credentials for authentication when we are in the
// private browsing mode (but not in "never remember history" mode) and when
// not explicitely allowed. Otherwise, it would cause a privacy data leak.
nsCOMPtr<nsIChannel> bareChannel = do_QueryInterface(channel);
MOZ_ASSERT(bareChannel);
if (NS_UsePrivateBrowsing(bareChannel)) {
bool ssoInPb;
if (NS_SUCCEEDED(prefs->GetBoolPref(kSSOinPBmode, &ssoInPb)) &&
ssoInPb) {
return true;
}
bool dontRememberHistory;
if (NS_SUCCEEDED(prefs->GetBoolPref("browser.privatebrowsing.autostart",
&dontRememberHistory)) &&
!dontRememberHistory) {
return false;
}
}
nsCOMPtr<nsIURI> uri;
Unused << channel->GetURI(getter_AddRefs(uri));
bool allowNonFqdn;
if (NS_FAILED(prefs->GetBoolPref(kAllowNonFqdn, &allowNonFqdn)))
allowNonFqdn = false;
if (allowNonFqdn && uri && IsNonFqdn(uri)) {
LOG(("Host is non-fqdn, default credentials are allowed\n"));
return true;
}
bool isTrustedHost = (uri && auth::URIMatchesPrefPattern(uri, kTrustedURIs));
LOG(("Default credentials allowed for host: %d\n", isTrustedHost));
return isTrustedHost;
}
// Dummy class for session state object. This class doesn't hold any data.
// Instead we use its existence as a flag. See ChallengeReceived.
class nsNTLMSessionState final : public nsISupports
{
~nsNTLMSessionState() = default;
public:
NS_DECL_ISUPPORTS
};
NS_IMPL_ISUPPORTS0(nsNTLMSessionState)
//-----------------------------------------------------------------------------
NS_IMPL_ISUPPORTS(nsHttpNTLMAuth, nsIHttpAuthenticator)
NS_IMETHODIMP
nsHttpNTLMAuth::ChallengeReceived(nsIHttpAuthenticableChannel *channel,
const char *challenge,
bool isProxyAuth,
nsISupports **sessionState,
nsISupports **continuationState,
bool *identityInvalid)
{
LOG(("nsHttpNTLMAuth::ChallengeReceived [ss=%p cs=%p]\n",
*sessionState, *continuationState));
// Use the native NTLM if available
mUseNative = true;
// NOTE: we don't define any session state, but we do use the pointer.
*identityInvalid = false;
// Start a new auth sequence if the challenge is exactly "NTLM".
// If native NTLM auth apis are available and enabled through prefs,
// try to use them.
if (PL_strcasecmp(challenge, "NTLM") == 0) {
nsCOMPtr<nsISupports> module;
// Check to see if we should default to our generic NTLM auth module
// through UseGenericNTLM. (We use native auth by default if the
// system provides it.) If *sessionState is non-null, we failed to
// instantiate a native NTLM module the last time, so skip trying again.
bool forceGeneric = ForceGenericNTLM();
if (!forceGeneric && !*sessionState) {
// Check for approved default credentials hosts and proxies. If
// *continuationState is non-null, the last authentication attempt
// failed so skip default credential use.
if (!*continuationState && CanUseDefaultCredentials(channel, isProxyAuth)) {
// Try logging in with the user's default credentials. If
// successful, |identityInvalid| is false, which will trigger
// a default credentials attempt once we return.
module = do_CreateInstance(NS_AUTH_MODULE_CONTRACTID_PREFIX "sys-ntlm");
}
#ifdef XP_WIN
else {
// Try to use native NTLM and prompt the user for their domain,
// username, and password. (only supported by windows nsAuthSSPI module.)
// Note, for servers that use LMv1 a weak hash of the user's password
// will be sent. We rely on windows internal apis to decide whether
// we should support this older, less secure version of the protocol.
module = do_CreateInstance(NS_AUTH_MODULE_CONTRACTID_PREFIX "sys-ntlm");
*identityInvalid = true;
}
#endif // XP_WIN
if (!module)
LOG(("Native sys-ntlm auth module not found.\n"));
}
#ifdef XP_WIN
// On windows, never fall back unless the user has specifically requested so.
if (!forceGeneric && !module)
return NS_ERROR_UNEXPECTED;
#endif
// If no native support was available. Fall back on our internal NTLM implementation.
if (!module) {
if (!*sessionState) {
// Remember the fact that we cannot use the "sys-ntlm" module,
// so we don't ever bother trying again for this auth domain.
*sessionState = new nsNTLMSessionState();
if (!*sessionState)
return NS_ERROR_OUT_OF_MEMORY;
NS_ADDREF(*sessionState);
}
// Use our internal NTLM implementation. Note, this is less secure,
// see bug 520607 for details.
LOG(("Trying to fall back on internal ntlm auth.\n"));
module = do_CreateInstance(NS_AUTH_MODULE_CONTRACTID_PREFIX "ntlm");
mUseNative = false;
// Prompt user for domain, username, and password.
*identityInvalid = true;
}
// If this fails, then it means that we cannot do NTLM auth.
if (!module) {
LOG(("No ntlm auth modules available.\n"));
return NS_ERROR_UNEXPECTED;
}
// A non-null continuation state implies that we failed to authenticate.
// Blow away the old authentication state, and use the new one.
module.swap(*continuationState);
}
return NS_OK;
}
NS_IMETHODIMP
nsHttpNTLMAuth::GenerateCredentialsAsync(nsIHttpAuthenticableChannel *authChannel,
nsIHttpAuthenticatorCallback* aCallback,
const char *challenge,
bool isProxyAuth,
const char16_t *domain,
const char16_t *username,
const char16_t *password,
nsISupports *sessionState,
nsISupports *continuationState,
nsICancelable **aCancellable)
{
return NS_ERROR_NOT_IMPLEMENTED;
}
NS_IMETHODIMP
nsHttpNTLMAuth::GenerateCredentials(nsIHttpAuthenticableChannel *authChannel,
const char *challenge,
bool isProxyAuth,
const char16_t *domain,
const char16_t *user,
const char16_t *pass,
nsISupports **sessionState,
nsISupports **continuationState,
uint32_t *aFlags,
char **creds)
{
LOG(("nsHttpNTLMAuth::GenerateCredentials\n"));
*creds = nullptr;
*aFlags = 0;
// if user or password is empty, ChallengeReceived returned
// identityInvalid = false, that means we are using default user
// credentials; see nsAuthSSPI::Init method for explanation of this
// condition
if (!user || !pass)
*aFlags = USING_INTERNAL_IDENTITY;
nsresult rv;
nsCOMPtr<nsIAuthModule> module = do_QueryInterface(*continuationState, &rv);
NS_ENSURE_SUCCESS(rv, rv);
void *inBuf, *outBuf;
uint32_t inBufLen, outBufLen;
// initial challenge
if (PL_strcasecmp(challenge, "NTLM") == 0) {
// NTLM service name format is 'HTTP@host' for both http and https
nsCOMPtr<nsIURI> uri;
rv = authChannel->GetURI(getter_AddRefs(uri));
if (NS_FAILED(rv))
return rv;
nsAutoCString serviceName, host;
rv = uri->GetAsciiHost(host);
if (NS_FAILED(rv))
return rv;
serviceName.AppendLiteral("HTTP@");
serviceName.Append(host);
// initialize auth module
uint32_t reqFlags = nsIAuthModule::REQ_DEFAULT;
if (isProxyAuth)
reqFlags |= nsIAuthModule::REQ_PROXY_AUTH;
rv = module->Init(serviceName.get(), reqFlags, domain, user, pass);
if (NS_FAILED(rv))
return rv;
// This update enables updated Windows machines (Win7 or patched previous
// versions) and Linux machines running Samba (updated for Channel
// Binding), to perform Channel Binding when authenticating using NTLMv2
// and an outer secure channel.
//
// Currently only implemented for Windows, linux support will be landing in
// a separate patch, update this #ifdef accordingly then.
#if defined (XP_WIN) /* || defined (LINUX) */
// We should retrieve the server certificate and compute the CBT,
// but only when we are using the native NTLM implementation and
// not the internal one.
// It is a valid case not having the security info object. This
// occures when we connect an https site through an ntlm proxy.
// After the ssl tunnel has been created, we get here the second
// time and now generate the CBT from now valid security info.
nsCOMPtr<nsIChannel> channel = do_QueryInterface(authChannel, &rv);
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsISupports> security;
rv = channel->GetSecurityInfo(getter_AddRefs(security));
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsITransportSecurityInfo> secInfo =
do_QueryInterface(security);
if (mUseNative && secInfo) {
nsCOMPtr<nsISSLStatus> status;
rv = secInfo->GetSSLStatus(getter_AddRefs(status));
if (NS_FAILED(rv))
return rv;
nsCOMPtr<nsIX509Cert> cert;
rv = status->GetServerCert(getter_AddRefs(cert));
if (NS_FAILED(rv))
return rv;
uint32_t length;
uint8_t* certArray;
rv = cert->GetRawDER(&length, &certArray);
if (NS_FAILED(rv))
return rv;
// If there is a server certificate, we pass it along the
// first time we call GetNextToken().
inBufLen = length;
inBuf = certArray;
} else {
// If there is no server certificate, we don't pass anything.
inBufLen = 0;
inBuf = nullptr;
}
#else // Extended protection update is just for Linux and Windows machines.
inBufLen = 0;
inBuf = nullptr;
#endif
}
else {
// decode challenge; skip past "NTLM " to the start of the base64
// encoded data.
int len = strlen(challenge);
if (len < 6)
return NS_ERROR_UNEXPECTED; // bogus challenge
challenge += 5;
len -= 5;
// strip off any padding (see bug 230351)
while (challenge[len - 1] == '=')
len--;
// decode into the input secbuffer
rv = Base64Decode(challenge, len, (char**)&inBuf, &inBufLen);
if (NS_FAILED(rv)) {
return rv;
}
}
rv = module->GetNextToken(inBuf, inBufLen, &outBuf, &outBufLen);
if (NS_SUCCEEDED(rv)) {
// base64 encode data in output buffer and prepend "NTLM "
CheckedUint32 credsLen = ((CheckedUint32(outBufLen) + 2) / 3) * 4;
credsLen += 5; // "NTLM "
credsLen += 1; // null terminate
if (!credsLen.isValid()) {
rv = NS_ERROR_FAILURE;
} else {
*creds = (char *) moz_xmalloc(credsLen.value());
memcpy(*creds, "NTLM ", 5);
PL_Base64Encode((char *) outBuf, outBufLen, *creds + 5);
(*creds)[credsLen.value() - 1] = '\0'; // null terminate
}
// OK, we are done with |outBuf|
free(outBuf);
}
if (inBuf)
free(inBuf);
return rv;
}
NS_IMETHODIMP
nsHttpNTLMAuth::GetAuthFlags(uint32_t *flags)
{
*flags = CONNECTION_BASED | IDENTITY_INCLUDES_DOMAIN | IDENTITY_ENCRYPTED;
return NS_OK;
}
} // namespace net
} // namespace mozilla
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