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gecko-dev/extensions/auth/nsAuthGSSAPI.cpp

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/* vim:set ts=4 sw=4 sts=4 et cindent: */
/* 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/. */
//
// GSSAPI Authentication Support Module
//
// Described by IETF Internet draft: draft-brezak-kerberos-http-00.txt
// (formerly draft-brezak-spnego-http-04.txt)
//
// Also described here:
// http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnsecure/html/http-sso-1.asp
//
//
#include "mozilla/Util.h"
#include "prlink.h"
#include "nsCOMPtr.h"
#include "nsIPrefService.h"
#include "nsIPrefBranch.h"
#include "nsIServiceManager.h"
#include "nsNativeCharsetUtils.h"
#include "nsAuthGSSAPI.h"
#ifdef XP_MACOSX
#include <Kerberos/Kerberos.h>
#endif
#ifdef XP_MACOSX
typedef KLStatus (*KLCacheHasValidTickets_type)(
KLPrincipal,
KLKerberosVersion,
KLBoolean *,
KLPrincipal *,
char **);
#endif
#if defined(HAVE_RES_NINIT)
#include <resolv.h>
#endif
using namespace mozilla;
//-----------------------------------------------------------------------------
// We define GSS_C_NT_HOSTBASED_SERVICE explicitly since it may be referenced
// by by a different name depending on the implementation of gss but always
// has the same value
static gss_OID_desc gss_c_nt_hostbased_service =
{ 10, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x01\x04" };
static const char kNegotiateAuthGssLib[] =
"network.negotiate-auth.gsslib";
static const char kNegotiateAuthNativeImp[] =
"network.negotiate-auth.using-native-gsslib";
static struct GSSFunction {
const char *str;
PRFuncPtr func;
} gssFuncs[] = {
{ "gss_display_status", NULL },
{ "gss_init_sec_context", NULL },
{ "gss_indicate_mechs", NULL },
{ "gss_release_oid_set", NULL },
{ "gss_delete_sec_context", NULL },
{ "gss_import_name", NULL },
{ "gss_release_buffer", NULL },
{ "gss_release_name", NULL },
{ "gss_wrap", NULL },
{ "gss_unwrap", NULL }
};
static bool gssNativeImp = true;
static PRLibrary* gssLibrary = nullptr;
#define gss_display_status_ptr ((gss_display_status_type)*gssFuncs[0].func)
#define gss_init_sec_context_ptr ((gss_init_sec_context_type)*gssFuncs[1].func)
#define gss_indicate_mechs_ptr ((gss_indicate_mechs_type)*gssFuncs[2].func)
#define gss_release_oid_set_ptr ((gss_release_oid_set_type)*gssFuncs[3].func)
#define gss_delete_sec_context_ptr ((gss_delete_sec_context_type)*gssFuncs[4].func)
#define gss_import_name_ptr ((gss_import_name_type)*gssFuncs[5].func)
#define gss_release_buffer_ptr ((gss_release_buffer_type)*gssFuncs[6].func)
#define gss_release_name_ptr ((gss_release_name_type)*gssFuncs[7].func)
#define gss_wrap_ptr ((gss_wrap_type)*gssFuncs[8].func)
#define gss_unwrap_ptr ((gss_unwrap_type)*gssFuncs[9].func)
#ifdef XP_MACOSX
static PRFuncPtr KLCacheHasValidTicketsPtr;
#define KLCacheHasValidTickets_ptr \
((KLCacheHasValidTickets_type)*KLCacheHasValidTicketsPtr)
#endif
static nsresult
gssInit()
{
nsXPIDLCString libPath;
nsCOMPtr<nsIPrefBranch> prefs = do_GetService(NS_PREFSERVICE_CONTRACTID);
if (prefs) {
prefs->GetCharPref(kNegotiateAuthGssLib, getter_Copies(libPath));
prefs->GetBoolPref(kNegotiateAuthNativeImp, &gssNativeImp);
}
PRLibrary *lib = NULL;
if (!libPath.IsEmpty()) {
LOG(("Attempting to load user specified library [%s]\n", libPath.get()));
gssNativeImp = false;
lib = PR_LoadLibrary(libPath.get());
}
else {
#ifdef XP_WIN
char *libName = PR_GetLibraryName(NULL, "gssapi32");
if (libName) {
lib = PR_LoadLibrary("gssapi32");
PR_FreeLibraryName(libName);
}
#else
const char *const libNames[] = {
"gss",
"gssapi_krb5",
"gssapi"
};
const char *const verLibNames[] = {
"libgssapi_krb5.so.2", /* MIT - FC, Suse10, Debian */
"libgssapi.so.4", /* Heimdal - Suse10, MDK */
"libgssapi.so.1", /* Heimdal - Suse9, CITI - FC, MDK, Suse10*/
"libgssapi.so" /* OpenBSD */
};
for (size_t i = 0; i < ArrayLength(verLibNames) && !lib; ++i) {
lib = PR_LoadLibrary(verLibNames[i]);
/* The CITI libgssapi library calls exit() during
* initialization if it's not correctly configured. Try to
* ensure that we never use this library for our GSSAPI
* support, as its just a wrapper library, anyway.
* See Bugzilla #325433
*/
if (lib &&
PR_FindFunctionSymbol(lib,
"internal_krb5_gss_initialize") &&
PR_FindFunctionSymbol(lib, "gssd_pname_to_uid")) {
LOG(("CITI libgssapi found, which calls exit(). Skipping\n"));
PR_UnloadLibrary(lib);
lib = NULL;
}
}
for (size_t i = 0; i < ArrayLength(libNames) && !lib; ++i) {
char *libName = PR_GetLibraryName(NULL, libNames[i]);
if (libName) {
lib = PR_LoadLibrary(libName);
PR_FreeLibraryName(libName);
if (lib &&
PR_FindFunctionSymbol(lib,
"internal_krb5_gss_initialize") &&
PR_FindFunctionSymbol(lib, "gssd_pname_to_uid")) {
LOG(("CITI libgssapi found, which calls exit(). Skipping\n"));
PR_UnloadLibrary(lib);
lib = NULL;
}
}
}
#endif
}
if (!lib) {
LOG(("Fail to load gssapi library\n"));
return NS_ERROR_FAILURE;
}
LOG(("Attempting to load gss functions\n"));
for (size_t i = 0; i < ArrayLength(gssFuncs); ++i) {
gssFuncs[i].func = PR_FindFunctionSymbol(lib, gssFuncs[i].str);
if (!gssFuncs[i].func) {
LOG(("Fail to load %s function from gssapi library\n", gssFuncs[i].str));
PR_UnloadLibrary(lib);
return NS_ERROR_FAILURE;
}
}
#ifdef XP_MACOSX
if (gssNativeImp &&
!(KLCacheHasValidTicketsPtr =
PR_FindFunctionSymbol(lib, "KLCacheHasValidTickets"))) {
LOG(("Fail to load KLCacheHasValidTickets function from gssapi library\n"));
PR_UnloadLibrary(lib);
return NS_ERROR_FAILURE;
}
#endif
gssLibrary = lib;
return NS_OK;
}
#if defined( PR_LOGGING )
// Generate proper GSSAPI error messages from the major and
// minor status codes.
void
LogGssError(OM_uint32 maj_stat, OM_uint32 min_stat, const char *prefix)
{
OM_uint32 new_stat;
OM_uint32 msg_ctx = 0;
gss_buffer_desc status1_string;
gss_buffer_desc status2_string;
OM_uint32 ret;
nsAutoCString errorStr;
errorStr.Assign(prefix);
if (!gssLibrary)
return;
errorStr += ": ";
do {
ret = gss_display_status_ptr(&new_stat,
maj_stat,
GSS_C_GSS_CODE,
GSS_C_NULL_OID,
&msg_ctx,
&status1_string);
errorStr.Append((const char *) status1_string.value, status1_string.length);
gss_release_buffer_ptr(&new_stat, &status1_string);
errorStr += '\n';
ret = gss_display_status_ptr(&new_stat,
min_stat,
GSS_C_MECH_CODE,
GSS_C_NULL_OID,
&msg_ctx,
&status2_string);
errorStr.Append((const char *) status2_string.value, status2_string.length);
errorStr += '\n';
} while (!GSS_ERROR(ret) && msg_ctx != 0);
LOG(("%s\n", errorStr.get()));
}
#else /* PR_LOGGING */
#define LogGssError(x,y,z)
#endif /* PR_LOGGING */
//-----------------------------------------------------------------------------
nsAuthGSSAPI::nsAuthGSSAPI(pType package)
: mServiceFlags(REQ_DEFAULT)
{
OM_uint32 minstat;
OM_uint32 majstat;
gss_OID_set mech_set;
gss_OID item;
unsigned int i;
static gss_OID_desc gss_krb5_mech_oid_desc =
{ 9, (void *) "\x2a\x86\x48\x86\xf7\x12\x01\x02\x02" };
static gss_OID_desc gss_spnego_mech_oid_desc =
{ 6, (void *) "\x2b\x06\x01\x05\x05\x02" };
LOG(("entering nsAuthGSSAPI::nsAuthGSSAPI()\n"));
mComplete = false;
if (!gssLibrary && NS_FAILED(gssInit()))
return;
mCtx = GSS_C_NO_CONTEXT;
mMechOID = &gss_krb5_mech_oid_desc;
// if the type is kerberos we accept it as default
// and exit
if (package == PACKAGE_TYPE_KERBEROS)
return;
// Now, look at the list of supported mechanisms,
// if SPNEGO is found, then use it.
// Otherwise, set the desired mechanism to
// GSS_C_NO_OID and let the system try to use
// the default mechanism.
//
// Using Kerberos directly (instead of negotiating
// with SPNEGO) may work in some cases depending
// on how smart the server side is.
majstat = gss_indicate_mechs_ptr(&minstat, &mech_set);
if (GSS_ERROR(majstat))
return;
if (mech_set) {
for (i=0; i<mech_set->count; i++) {
item = &mech_set->elements[i];
if (item->length == gss_spnego_mech_oid_desc.length &&
!memcmp(item->elements, gss_spnego_mech_oid_desc.elements,
item->length)) {
// ok, we found it
mMechOID = &gss_spnego_mech_oid_desc;
break;
}
}
gss_release_oid_set_ptr(&minstat, &mech_set);
}
}
void
nsAuthGSSAPI::Reset()
{
if (gssLibrary && mCtx != GSS_C_NO_CONTEXT) {
OM_uint32 minor_status;
gss_delete_sec_context_ptr(&minor_status, &mCtx, GSS_C_NO_BUFFER);
}
mCtx = GSS_C_NO_CONTEXT;
mComplete = false;
}
/* static */ void
nsAuthGSSAPI::Shutdown()
{
if (gssLibrary) {
PR_UnloadLibrary(gssLibrary);
gssLibrary = nullptr;
}
}
/* Limitations apply to this class's thread safety. See the header file */
NS_IMPL_THREADSAFE_ISUPPORTS1(nsAuthGSSAPI, nsIAuthModule)
NS_IMETHODIMP
nsAuthGSSAPI::Init(const char *serviceName,
uint32_t serviceFlags,
const PRUnichar *domain,
const PRUnichar *username,
const PRUnichar *password)
{
// we don't expect to be passed any user credentials
NS_ASSERTION(!domain && !username && !password, "unexpected credentials");
// it's critial that the caller supply a service name to be used
NS_ENSURE_TRUE(serviceName && *serviceName, NS_ERROR_INVALID_ARG);
LOG(("entering nsAuthGSSAPI::Init()\n"));
if (!gssLibrary)
return NS_ERROR_NOT_INITIALIZED;
mServiceName = serviceName;
mServiceFlags = serviceFlags;
return NS_OK;
}
NS_IMETHODIMP
nsAuthGSSAPI::GetNextToken(const void *inToken,
uint32_t inTokenLen,
void **outToken,
uint32_t *outTokenLen)
{
OM_uint32 major_status, minor_status;
OM_uint32 req_flags = 0;
gss_buffer_desc input_token = GSS_C_EMPTY_BUFFER;
gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
gss_buffer_t in_token_ptr = GSS_C_NO_BUFFER;
gss_name_t server;
nsAutoCString userbuf;
nsresult rv;
LOG(("entering nsAuthGSSAPI::GetNextToken()\n"));
if (!gssLibrary)
return NS_ERROR_NOT_INITIALIZED;
// If they've called us again after we're complete, reset to start afresh.
if (mComplete)
Reset();
if (mServiceFlags & REQ_DELEGATE)
req_flags |= GSS_C_DELEG_FLAG;
if (mServiceFlags & REQ_MUTUAL_AUTH)
req_flags |= GSS_C_MUTUAL_FLAG;
input_token.value = (void *)mServiceName.get();
input_token.length = mServiceName.Length() + 1;
#if defined(HAVE_RES_NINIT)
res_ninit(&_res);
#endif
major_status = gss_import_name_ptr(&minor_status,
&input_token,
&gss_c_nt_hostbased_service,
&server);
input_token.value = NULL;
input_token.length = 0;
if (GSS_ERROR(major_status)) {
LogGssError(major_status, minor_status, "gss_import_name() failed");
return NS_ERROR_FAILURE;
}
if (inToken) {
input_token.length = inTokenLen;
input_token.value = (void *) inToken;
in_token_ptr = &input_token;
}
else if (mCtx != GSS_C_NO_CONTEXT) {
// If there is no input token, then we are starting a new
// authentication sequence. If we have already initialized our
// security context, then we're in trouble because it means that the
// first sequence failed. We need to bail or else we might end up in
// an infinite loop.
LOG(("Cannot restart authentication sequence!"));
return NS_ERROR_UNEXPECTED;
}
#if defined(XP_MACOSX)
// Suppress Kerberos prompts to get credentials. See bug 240643.
// We can only use Mac OS X specific kerb functions if we are using
// the native lib
KLBoolean found;
bool doingMailTask = mServiceName.Find("imap@") ||
mServiceName.Find("pop@") ||
mServiceName.Find("smtp@") ||
mServiceName.Find("ldap@");
if (!doingMailTask && (gssNativeImp &&
(KLCacheHasValidTickets_ptr(NULL, kerberosVersion_V5, &found, NULL, NULL) != klNoErr || !found)))
{
major_status = GSS_S_FAILURE;
minor_status = 0;
}
else
#endif /* XP_MACOSX */
major_status = gss_init_sec_context_ptr(&minor_status,
GSS_C_NO_CREDENTIAL,
&mCtx,
server,
mMechOID,
req_flags,
GSS_C_INDEFINITE,
GSS_C_NO_CHANNEL_BINDINGS,
in_token_ptr,
nullptr,
&output_token,
nullptr,
nullptr);
if (GSS_ERROR(major_status)) {
LogGssError(major_status, minor_status, "gss_init_sec_context() failed");
Reset();
rv = NS_ERROR_FAILURE;
goto end;
}
if (major_status == GSS_S_COMPLETE) {
// Mark ourselves as being complete, so that if we're called again
// we know to start afresh.
mComplete = true;
}
else if (major_status == GSS_S_CONTINUE_NEEDED) {
//
// The important thing is that we do NOT reset the
// context here because it will be needed on the
// next call.
//
}
*outTokenLen = output_token.length;
if (output_token.length != 0)
*outToken = nsMemory::Clone(output_token.value, output_token.length);
else
*outToken = NULL;
gss_release_buffer_ptr(&minor_status, &output_token);
if (major_status == GSS_S_COMPLETE)
rv = NS_SUCCESS_AUTH_FINISHED;
else
rv = NS_OK;
end:
gss_release_name_ptr(&minor_status, &server);
LOG((" leaving nsAuthGSSAPI::GetNextToken [rv=%x]", rv));
return rv;
}
NS_IMETHODIMP
nsAuthGSSAPI::Unwrap(const void *inToken,
uint32_t inTokenLen,
void **outToken,
uint32_t *outTokenLen)
{
OM_uint32 major_status, minor_status;
gss_buffer_desc input_token;
gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
input_token.value = (void *) inToken;
input_token.length = inTokenLen;
major_status = gss_unwrap_ptr(&minor_status,
mCtx,
&input_token,
&output_token,
NULL,
NULL);
if (GSS_ERROR(major_status)) {
LogGssError(major_status, minor_status, "gss_unwrap() failed");
Reset();
gss_release_buffer_ptr(&minor_status, &output_token);
return NS_ERROR_FAILURE;
}
*outTokenLen = output_token.length;
if (output_token.length)
*outToken = nsMemory::Clone(output_token.value, output_token.length);
else
*outToken = NULL;
gss_release_buffer_ptr(&minor_status, &output_token);
return NS_OK;
}
NS_IMETHODIMP
nsAuthGSSAPI::Wrap(const void *inToken,
uint32_t inTokenLen,
bool confidential,
void **outToken,
uint32_t *outTokenLen)
{
OM_uint32 major_status, minor_status;
gss_buffer_desc input_token;
gss_buffer_desc output_token = GSS_C_EMPTY_BUFFER;
input_token.value = (void *) inToken;
input_token.length = inTokenLen;
major_status = gss_wrap_ptr(&minor_status,
mCtx,
confidential,
GSS_C_QOP_DEFAULT,
&input_token,
NULL,
&output_token);
if (GSS_ERROR(major_status)) {
LogGssError(major_status, minor_status, "gss_wrap() failed");
Reset();
gss_release_buffer_ptr(&minor_status, &output_token);
return NS_ERROR_FAILURE;
}
*outTokenLen = output_token.length;
/* it is not possible for output_token.length to be zero */
*outToken = nsMemory::Clone(output_token.value, output_token.length);
gss_release_buffer_ptr(&minor_status, &output_token);
return NS_OK;
}
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