Quelle  sslsock.c   Sprache: C

/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * vtables (and methods that call through them) for the 4 types of
 * SSLSockets supported.  Only one type is still supported.
 * Various other functions.
 *
 * 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 "seccomon.h"
#include "cert.h"
#include "keyhi.h"
#include "ssl.h"
#include "sslexp.h"
#include "sslimpl.h"
#include "sslproto.h"
#include "nspr.h"
#include "private/pprio.h"
#include "nss.h"
#include "pk11pqg.h"
#include "pk11pub.h"
#include "tls13ech.h"
#include "tls13psk.h"
#include "tls13subcerts.h"

static const sslSocketOps ssl_default_ops = { /* No SSL. */
                                              ssl_DefConnect,
                                              NULL,
                                              ssl_DefBind,
                                              ssl_DefListen,
                                              ssl_DefShutdown,
                                              ssl_DefClose,
                                              ssl_DefRecv,
                                              ssl_DefSend,
                                              ssl_DefRead,
                                              ssl_DefWrite,
                                              ssl_DefGetpeername,
                                              ssl_DefGetsockname
};

static const sslSocketOps ssl_secure_ops = { /* SSL. */
                                             ssl_SecureConnect,
                                             NULL,
                                             ssl_DefBind,
                                             ssl_DefListen,
                                             ssl_SecureShutdown,
                                             ssl_SecureClose,
                                             ssl_SecureRecv,
                                             ssl_SecureSend,
                                             ssl_SecureRead,
                                             ssl_SecureWrite,
                                             ssl_DefGetpeername,
                                             ssl_DefGetsockname
};

/*
** default settings for socket enables
*/
static sslOptions ssl_defaults = {
    .nextProtoNego = { siBuffer, NULL, 0 },
    .maxEarlyDataSize = 1 << 16,
    .recordSizeLimit = MAX_FRAGMENT_LENGTH + 1,
    .useSecurity = PR_TRUE,
    .useSocks = PR_FALSE,
    .requestCertificate = PR_FALSE,
    .requireCertificate = SSL_REQUIRE_FIRST_HANDSHAKE,
    .handshakeAsClient = PR_FALSE,
    .handshakeAsServer = PR_FALSE,
    .noCache = PR_FALSE,
    .fdx = PR_FALSE,
    .detectRollBack = PR_TRUE,
    .noLocks = PR_FALSE,
    .enableSessionTickets = PR_FALSE,
    .enableDeflate = PR_FALSE,
    .enableRenegotiation = SSL_RENEGOTIATE_REQUIRES_XTN,
    .requireSafeNegotiation = PR_FALSE,
    .enableFalseStart = PR_FALSE,
    .cbcRandomIV = PR_TRUE,
    .enableOCSPStapling = PR_FALSE,
    .enableDelegatedCredentials = PR_FALSE,
    .enableALPN = PR_TRUE,
    .reuseServerECDHEKey = PR_FALSE,
    .enableFallbackSCSV = PR_FALSE,
    .enableServerDhe = PR_TRUE,
    .enableExtendedMS = PR_TRUE,
    .enableSignedCertTimestamps = PR_FALSE,
    .requireDHENamedGroups = PR_FALSE,
    .enable0RttData = PR_FALSE,
    .enableTls13CompatMode = PR_FALSE,
    .enableDtls13VersionCompat = PR_FALSE,
    .enableDtlsShortHeader = PR_FALSE,
    .enableHelloDowngradeCheck = PR_TRUE,
    .enableV2CompatibleHello = PR_FALSE,
    .enablePostHandshakeAuth = PR_FALSE,
    .suppressEndOfEarlyData = PR_FALSE,
    .enableTls13GreaseEch = PR_FALSE,
    .enableTls13BackendEch = PR_FALSE,
    .callExtensionWriterOnEchInner = PR_FALSE,
    .enableGrease = PR_FALSE,
    .enableChXtnPermutation = PR_FALSE
};

/*
 * default range of enabled SSL/TLS protocols
 */
static SSLVersionRange versions_defaults_stream = {
    SSL_LIBRARY_VERSION_TLS_1_2,
    SSL_LIBRARY_VERSION_TLS_1_3
};

static SSLVersionRange versions_defaults_datagram = {
    SSL_LIBRARY_VERSION_TLS_1_2,
    SSL_LIBRARY_VERSION_TLS_1_2
};

#define VERSIONS_DEFAULTS(variant) \
    (variant == ssl_variant_stream ? &versions_defaults_stream : &versions_defaults_datagram)
#define VERSIONS_POLICY_MIN(variant) \
    (variant == ssl_variant_stream ? NSS_TLS_VERSION_MIN_POLICY : NSS_DTLS_VERSION_MIN_POLICY)
#define VERSIONS_POLICY_MAX(variant) \
    (variant == ssl_variant_stream ? NSS_TLS_VERSION_MAX_POLICY : NSS_DTLS_VERSION_MAX_POLICY)

sslSessionIDLookupFunc ssl_sid_lookup;

static PRDescIdentity ssl_layer_id;

static PRCallOnceType ssl_setDefaultsFromEnvironment = { 0 };

PRBool ssl_force_locks;   /* implicitly PR_FALSE */
int ssl_lock_readers = 1; /* default true. */
char ssl_debug;
char ssl_trace;
FILE *ssl_trace_iob;

#ifdef NSS_ALLOW_SSLKEYLOGFILE
FILE *ssl_keylog_iob;
PZLock *ssl_keylog_lock;
#endif

/* SRTP_NULL_HMAC_SHA1_80 and SRTP_NULL_HMAC_SHA1_32 are not implemented. */
static const PRUint16 srtpCiphers[] = {
    SRTP_AES128_CM_HMAC_SHA1_80,
    SRTP_AES128_CM_HMAC_SHA1_32,
    0
};

/* This list is in preference order.  Note that while some smaller groups appear
 * early in the list, smaller groups are generally ignored when iterating
 * through this list. ffdhe_custom must not appear in this list. */
#define ECGROUP(name, size, oid, assumeSupported)  \
    {                                              \
        ssl_grp_ec_##name, size, ssl_kea_ecdh,     \
            SEC_OID_SECG_EC_##oid, assumeSupported \
    }
#define FFGROUP(size)                           \
    {                                           \
        ssl_grp_ffdhe_##size, size, ssl_kea_dh, \
            SEC_OID_TLS_FFDHE_##size, PR_TRUE   \
    }

const sslNamedGroupDef ssl_named_groups[] = {
    /* Note that 256 for 25519 is a lie, but we only use it for checking bit
     * security and expect 256 bits there (not 255). */
    { ssl_grp_ec_curve25519, 256, ssl_kea_ecdh, SEC_OID_CURVE25519, PR_TRUE },
    ECGROUP(secp256r1, 256, SECP256R1, PR_TRUE),
    ECGROUP(secp384r1, 384, SECP384R1, PR_TRUE),
    ECGROUP(secp521r1, 521, SECP521R1, PR_TRUE),
    { ssl_grp_kem_xyber768d00, 256, ssl_kea_ecdh_hybrid, SEC_OID_XYBER768D00, PR_TRUE },
    { ssl_grp_kem_mlkem768x25519, 256, ssl_kea_ecdh_hybrid, SEC_OID_MLKEM768X25519, PR_TRUE },
    FFGROUP(2048),
    FFGROUP(3072),
    FFGROUP(4096),
    FFGROUP(6144),
    FFGROUP(8192),
    ECGROUP(secp192r1, 192, SECP192R1, PR_FALSE),
    ECGROUP(secp160r2, 160, SECP160R2, PR_FALSE),
    ECGROUP(secp160k1, 160, SECP160K1, PR_FALSE),
    ECGROUP(secp160r1, 160, SECP160R1, PR_FALSE),
    ECGROUP(sect163k1, 163, SECT163K1, PR_FALSE),
    ECGROUP(sect163r1, 163, SECT163R1, PR_FALSE),
    ECGROUP(sect163r2, 163, SECT163R2, PR_FALSE),
    ECGROUP(secp192k1, 192, SECP192K1, PR_FALSE),
    ECGROUP(sect193r1, 193, SECT193R1, PR_FALSE),
    ECGROUP(sect193r2, 193, SECT193R2, PR_FALSE),
    ECGROUP(secp224r1, 224, SECP224R1, PR_FALSE),
    ECGROUP(secp224k1, 224, SECP224K1, PR_FALSE),
    ECGROUP(sect233k1, 233, SECT233K1, PR_FALSE),
    ECGROUP(sect233r1, 233, SECT233R1, PR_FALSE),
    ECGROUP(sect239k1, 239, SECT239K1, PR_FALSE),
    ECGROUP(secp256k1, 256, SECP256K1, PR_FALSE),
    ECGROUP(sect283k1, 283, SECT283K1, PR_FALSE),
    ECGROUP(sect283r1, 283, SECT283R1, PR_FALSE),
    ECGROUP(sect409k1, 409, SECT409K1, PR_FALSE),
    ECGROUP(sect409r1, 409, SECT409R1, PR_FALSE),
    ECGROUP(sect571k1, 571, SECT571K1, PR_FALSE),
    ECGROUP(sect571r1, 571, SECT571R1, PR_FALSE),
};
PR_STATIC_ASSERT(SSL_NAMED_GROUP_COUNT == PR_ARRAY_SIZE(ssl_named_groups));

#undef ECGROUP
#undef FFGROUP

/* forward declarations. */
static sslSocket *ssl_NewSocket(PRBool makeLocks, SSLProtocolVariant variant);
static SECStatus ssl_MakeLocks(sslSocket *ss);
static PRStatus ssl_SetDefaultsFromEnvironmentCallOnce(void);
static void ssl_SetDefaultsFromEnvironment(void);
static PRStatus ssl_PushIOLayer(sslSocket *ns, PRFileDesc *stack,
                                PRDescIdentity id);

/************************************************************************/

/*
** Lookup a socket structure from a file descriptor.
** Only functions called through the PRIOMethods table should use this.
** Other app-callable functions should use ssl_FindSocket.
*/
static sslSocket *
ssl_GetPrivate(PRFileDesc *fd)
{
    sslSocket *ss;

    PORT_Assert(fd != NULL);
    PORT_Assert(fd->methods->file_type == PR_DESC_LAYERED);
    PORT_Assert(fd->identity == ssl_layer_id);

    if (fd->methods->file_type != PR_DESC_LAYERED ||
        fd->identity != ssl_layer_id) {
        PORT_SetError(PR_BAD_DESCRIPTOR_ERROR);
        return NULL;
    }

    ss = (sslSocket *)fd->secret;
    /* Set ss->fd lazily. We can't rely on the value of ss->fd set by
     * ssl_PushIOLayer because another PR_PushIOLayer call will switch the
     * contents of the PRFileDesc pointed by ss->fd and the new layer.
     * See bug 807250.
     */
    ss->fd = fd;
    return ss;
}

/* This function tries to find the SSL layer in the stack.
 * It searches for the first SSL layer at or below the argument fd,
 * and failing that, it searches for the nearest SSL layer above the
 * argument fd.  It returns the private sslSocket from the found layer.
 */
sslSocket *
ssl_FindSocket(PRFileDesc *fd)
{
    PRFileDesc *layer;
    sslSocket *ss;

    PORT_Assert(fd != NULL);
    PORT_Assert(ssl_layer_id != 0);

    layer = PR_GetIdentitiesLayer(fd, ssl_layer_id);
    if (layer == NULL) {
        PORT_SetError(PR_BAD_DESCRIPTOR_ERROR);
        return NULL;
    }

    ss = (sslSocket *)layer->secret;
    /* Set ss->fd lazily. We can't rely on the value of ss->fd set by
     * ssl_PushIOLayer because another PR_PushIOLayer call will switch the
     * contents of the PRFileDesc pointed by ss->fd and the new layer.
     * See bug 807250.
     */
    ss->fd = layer;
    return ss;
}

static sslSocket *
ssl_DupSocket(sslSocket *os)
{
    sslSocket *ss;
    SECStatus rv;

    ss = ssl_NewSocket((PRBool)(!os->opt.noLocks), os->protocolVariant);
    if (!ss) {
        return NULL;
    }

    ss->opt = os->opt;
    ss->opt.useSocks = PR_FALSE;
    rv = SECITEM_CopyItem(NULL, &ss->opt.nextProtoNego, &os->opt.nextProtoNego);
    if (rv != SECSuccess) {
        goto loser;
    }
    ss->vrange = os->vrange;
    ss->now = os->now;
    ss->nowArg = os->nowArg;

    ss->peerID = !os->peerID ? NULL : PORT_Strdup(os->peerID);
    ss->url = !os->url ? NULL : PORT_Strdup(os->url);

    ss->ops = os->ops;
    ss->rTimeout = os->rTimeout;
    ss->wTimeout = os->wTimeout;
    ss->cTimeout = os->cTimeout;
    ss->dbHandle = os->dbHandle;

    /* copy ssl2&3 policy & prefs, even if it's not selected (yet) */
    PORT_Memcpy(ss->cipherSuites, os->cipherSuites, sizeof os->cipherSuites);
    PORT_Memcpy(ss->ssl3.dtlsSRTPCiphers, os->ssl3.dtlsSRTPCiphers,
                sizeof(PRUint16) * os->ssl3.dtlsSRTPCipherCount);
    ss->ssl3.dtlsSRTPCipherCount = os->ssl3.dtlsSRTPCipherCount;
    PORT_Memcpy(ss->ssl3.signatureSchemes, os->ssl3.signatureSchemes,
                sizeof(ss->ssl3.signatureSchemes[0]) *
                    os->ssl3.signatureSchemeCount);
    ss->ssl3.signatureSchemeCount = os->ssl3.signatureSchemeCount;
    ss->ssl3.downgradeCheckVersion = os->ssl3.downgradeCheckVersion;

    ss->ssl3.dheWeakGroupEnabled = os->ssl3.dheWeakGroupEnabled;

    if (ss->opt.useSecurity) {
        PRCList *cursor;

        for (cursor = PR_NEXT_LINK(&os->serverCerts);
             cursor != &os->serverCerts;
             cursor = PR_NEXT_LINK(cursor)) {
            sslServerCert *sc = ssl_CopyServerCert((sslServerCert *)cursor);
            if (!sc)
                goto loser;
            PR_APPEND_LINK(&sc->link, &ss->serverCerts);
        }

        for (cursor = PR_NEXT_LINK(&os->ephemeralKeyPairs);
             cursor != &os->ephemeralKeyPairs;
             cursor = PR_NEXT_LINK(cursor)) {
            sslEphemeralKeyPair *okp = (sslEphemeralKeyPair *)cursor;
            sslEphemeralKeyPair *skp = ssl_CopyEphemeralKeyPair(okp);
            if (!skp)
                goto loser;
            PR_APPEND_LINK(&skp->link, &ss->ephemeralKeyPairs);
        }

        for (cursor = PR_NEXT_LINK(&os->extensionHooks);
             cursor != &os->extensionHooks;
             cursor = PR_NEXT_LINK(cursor)) {
            sslCustomExtensionHooks *oh = (sslCustomExtensionHooks *)cursor;
            sslCustomExtensionHooks *sh = PORT_ZNew(sslCustomExtensionHooks);
            if (!sh) {
                goto loser;
            }
            *sh = *oh;
            PR_APPEND_LINK(&sh->link, &ss->extensionHooks);
        }

        /*
         * XXX the preceding CERT_ and SECKEY_ functions can fail and return NULL.
         * XXX We should detect this, and not just march on with NULL pointers.
         */
        ss->authCertificate = os->authCertificate;
        ss->authCertificateArg = os->authCertificateArg;
        ss->getClientAuthData = os->getClientAuthData;
        ss->getClientAuthDataArg = os->getClientAuthDataArg;
        ss->sniSocketConfig = os->sniSocketConfig;
        ss->sniSocketConfigArg = os->sniSocketConfigArg;
        ss->alertReceivedCallback = os->alertReceivedCallback;
        ss->alertReceivedCallbackArg = os->alertReceivedCallbackArg;
        ss->alertSentCallback = os->alertSentCallback;
        ss->alertSentCallbackArg = os->alertSentCallbackArg;
        ss->handleBadCert = os->handleBadCert;
        ss->badCertArg = os->badCertArg;
        ss->handshakeCallback = os->handshakeCallback;
        ss->handshakeCallbackData = os->handshakeCallbackData;
        ss->canFalseStartCallback = os->canFalseStartCallback;
        ss->canFalseStartCallbackData = os->canFalseStartCallbackData;
        ss->pkcs11PinArg = os->pkcs11PinArg;
        ss->nextProtoCallback = os->nextProtoCallback;
        ss->nextProtoArg = os->nextProtoArg;
        PORT_Memcpy((void *)ss->namedGroupPreferences,
                    os->namedGroupPreferences,
                    sizeof(ss->namedGroupPreferences));
        ss->additionalShares = os->additionalShares;
        ss->resumptionTokenCallback = os->resumptionTokenCallback;
        ss->resumptionTokenContext = os->resumptionTokenContext;

        rv = tls13_CopyEchConfigs(&os->echConfigs, &ss->echConfigs);
        if (rv != SECSuccess) {
            goto loser;
        }
        if (os->echPrivKey && os->echPubKey) {
            ss->echPrivKey = SECKEY_CopyPrivateKey(os->echPrivKey);
            ss->echPubKey = SECKEY_CopyPublicKey(os->echPubKey);
            if (!ss->echPrivKey || !ss->echPubKey) {
                goto loser;
            }
        }

        if (os->antiReplay) {
            ss->antiReplay = tls13_RefAntiReplayContext(os->antiReplay);
            PORT_Assert(ss->antiReplay); /* Can't fail. */
            if (!ss->antiReplay) {
                goto loser;
            }
        }
        if (os->psk) {
            ss->psk = tls13_CopyPsk(os->psk);
            if (!ss->psk) {
                goto loser;
            }
        }

        /* Create security data */
        rv = ssl_CopySecurityInfo(ss, os);
        if (rv != SECSuccess) {
            goto loser;
        }
    }

    return ss;

loser:
    ssl_FreeSocket(ss);
    return NULL;
}

static void
ssl_DestroyLocks(sslSocket *ss)
{
    /* Destroy locks. */
    if (ss->firstHandshakeLock) {
        PZ_DestroyMonitor(ss->firstHandshakeLock);
        ss->firstHandshakeLock = NULL;
    }
    if (ss->ssl3HandshakeLock) {
        PZ_DestroyMonitor(ss->ssl3HandshakeLock);
        ss->ssl3HandshakeLock = NULL;
    }
    if (ss->specLock) {
        NSSRWLock_Destroy(ss->specLock);
        ss->specLock = NULL;
    }

    if (ss->recvLock) {
        PZ_DestroyLock(ss->recvLock);
        ss->recvLock = NULL;
    }
    if (ss->sendLock) {
        PZ_DestroyLock(ss->sendLock);
        ss->sendLock = NULL;
    }
    if (ss->xmitBufLock) {
        PZ_DestroyMonitor(ss->xmitBufLock);
        ss->xmitBufLock = NULL;
    }
    if (ss->recvBufLock) {
        PZ_DestroyMonitor(ss->recvBufLock);
        ss->recvBufLock = NULL;
    }
}

/* Caller holds any relevant locks */
static void
ssl_DestroySocketContents(sslSocket *ss)
{
    PRCList *cursor;

    /* Free up socket */
    ssl_DestroySecurityInfo(&ss->sec);

    ssl3_DestroySSL3Info(ss);

    PORT_Free(ss->saveBuf.buf);
    PORT_Free(ss->pendingBuf.buf);
    ssl3_DestroyGather(&ss->gs);

    if (ss->peerID != NULL)
        PORT_Free(ss->peerID);
    if (ss->url != NULL)
        PORT_Free((void *)ss->url); /* CONST */

    /* Clean up server certificates and sundries. */
    while (!PR_CLIST_IS_EMPTY(&ss->serverCerts)) {
        cursor = PR_LIST_TAIL(&ss->serverCerts);
        PR_REMOVE_LINK(cursor);
        ssl_FreeServerCert((sslServerCert *)cursor);
    }

    /* Remove extension handlers. */
    ssl_ClearPRCList(&ss->extensionHooks, NULL);

    ssl_FreeEphemeralKeyPairs(ss);
    SECITEM_FreeItem(&ss->opt.nextProtoNego, PR_FALSE);
    ssl3_FreeSniNameArray(&ss->xtnData);

    ssl_ClearPRCList(&ss->ssl3.hs.dtlsSentHandshake, NULL);
    ssl_ClearPRCList(&ss->ssl3.hs.dtlsRcvdHandshake, NULL);
    tls13_DestroyPskList(&ss->ssl3.hs.psks);

    tls13_ReleaseAntiReplayContext(ss->antiReplay);

    tls13_DestroyPsk(ss->psk);

    tls13_DestroyEchConfigs(&ss->echConfigs);
    SECKEY_DestroyPrivateKey(ss->echPrivKey);
    SECKEY_DestroyPublicKey(ss->echPubKey);
}

/*
 * free an sslSocket struct, and all the stuff that hangs off of it
 */
void
ssl_FreeSocket(sslSocket *ss)
{
    /* Get every lock you can imagine!
    ** Caller already holds these:
    **  SSL_LOCK_READER(ss);
    **  SSL_LOCK_WRITER(ss);
    */
    ssl_Get1stHandshakeLock(ss);
    ssl_GetRecvBufLock(ss);
    ssl_GetSSL3HandshakeLock(ss);
    ssl_GetXmitBufLock(ss);
    ssl_GetSpecWriteLock(ss);

    ssl_DestroySocketContents(ss);

    /* Release all the locks acquired above.  */
    SSL_UNLOCK_READER(ss);
    SSL_UNLOCK_WRITER(ss);
    ssl_Release1stHandshakeLock(ss);
    ssl_ReleaseRecvBufLock(ss);
    ssl_ReleaseSSL3HandshakeLock(ss);
    ssl_ReleaseXmitBufLock(ss);
    ssl_ReleaseSpecWriteLock(ss);

    ssl_DestroyLocks(ss);

#ifdef DEBUG
    PORT_Memset(ss, 0x1f, sizeof *ss);
#endif
    PORT_Free(ss);
    return;
}

/************************************************************************/
SECStatus
ssl_EnableNagleDelay(sslSocket *ss, PRBool enabled)
{
    PRFileDesc *osfd = ss->fd->lower;
    SECStatus rv = SECFailure;
    PRSocketOptionData opt;

    opt.option = PR_SockOpt_NoDelay;
    opt.value.no_delay = (PRBool)!enabled;

    if (osfd->methods->setsocketoption) {
        rv = (SECStatus)osfd->methods->setsocketoption(osfd, &opt);
    } else {
        PR_SetError(PR_NOT_IMPLEMENTED_ERROR, 0);
    }

    return rv;
}

static void
ssl_ChooseOps(sslSocket *ss)
{
    ss->ops = ss->opt.useSecurity ? &ssl_secure_ops : &ssl_default_ops;
}

/* Called from SSL_Enable (immediately below) */
static SECStatus
PrepareSocket(sslSocket *ss)
{
    SECStatus rv = SECSuccess;

    ssl_ChooseOps(ss);
    return rv;
}

SECStatus
SSL_Enable(PRFileDesc *fd, int which, PRIntn on)
{
    return SSL_OptionSet(fd, which, on);
}

static PRBool ssl_VersionIsSupportedByPolicy(
    SSLProtocolVariant protocolVariant, SSL3ProtocolVersion version);

/* Implements the semantics for SSL_OptionSet(SSL_ENABLE_TLS, on) described in
 * ssl.h in the section "SSL version range setting API".
 */
static void
ssl_EnableTLS(SSLVersionRange *vrange, PRIntn enable)
{
    if (enable) {
        /* don't turn it on if tls1.0 disallowed by by policy */
        if (!ssl_VersionIsSupportedByPolicy(ssl_variant_stream,
                                            SSL_LIBRARY_VERSION_TLS_1_0)) {
            return;
        }
    }
    if (SSL_ALL_VERSIONS_DISABLED(vrange)) {
        if (enable) {
            vrange->min = SSL_LIBRARY_VERSION_TLS_1_0;
            vrange->max = SSL_LIBRARY_VERSION_TLS_1_0;
        } /* else don't change anything */
        return;
    }

    if (enable) {
        /* Expand the range of enabled version to include TLS 1.0 */
        vrange->min = PR_MIN(vrange->min, SSL_LIBRARY_VERSION_TLS_1_0);
        vrange->max = PR_MAX(vrange->max, SSL_LIBRARY_VERSION_TLS_1_0);
    } else {
        /* Disable all TLS versions, leaving only SSL 3.0 if it was enabled */
        if (vrange->min == SSL_LIBRARY_VERSION_3_0) {
            vrange->max = SSL_LIBRARY_VERSION_3_0;
        } else {
            /* Only TLS was enabled, so now no versions are. */
            vrange->min = SSL_LIBRARY_VERSION_NONE;
            vrange->max = SSL_LIBRARY_VERSION_NONE;
        }
    }
}

/* Implements the semantics for SSL_OptionSet(SSL_ENABLE_SSL3, on) described in
 * ssl.h in the section "SSL version range setting API".
 */
static void
ssl_EnableSSL3(SSLVersionRange *vrange, PRIntn enable)
{
    if (enable) {
        /* don't turn it on if ssl3 disallowed by by policy */
        if (!ssl_VersionIsSupportedByPolicy(ssl_variant_stream,
                                            SSL_LIBRARY_VERSION_3_0)) {
            return;
        }
    }
    if (SSL_ALL_VERSIONS_DISABLED(vrange)) {
        if (enable) {
            vrange->min = SSL_LIBRARY_VERSION_3_0;
            vrange->max = SSL_LIBRARY_VERSION_3_0;
        } /* else don't change anything */
        return;
    }

    if (enable) {
        /* Expand the range of enabled versions to include SSL 3.0. We know
         * SSL 3.0 or some version of TLS is already enabled at this point, so
         * we don't need to change vrange->max.
         */
        vrange->min = SSL_LIBRARY_VERSION_3_0;
    } else {
        /* Disable SSL 3.0, leaving TLS unaffected. */
        if (vrange->max > SSL_LIBRARY_VERSION_3_0) {
            vrange->min = PR_MAX(vrange->min, SSL_LIBRARY_VERSION_TLS_1_0);
        } else {
            /* Only SSL 3.0 was enabled, so now no versions are. */
            vrange->min = SSL_LIBRARY_VERSION_NONE;
            vrange->max = SSL_LIBRARY_VERSION_NONE;
        }
    }
}

SECStatus
SSL_OptionSet(PRFileDesc *fd, PRInt32 which, PRIntn val)
{
    sslSocket *ss = ssl_FindSocket(fd);
    SECStatus rv = SECSuccess;
    PRBool holdingLocks;

    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in Enable", SSL_GETPID(), fd));
        return SECFailure;
    }

    holdingLocks = (!ss->opt.noLocks);
    ssl_Get1stHandshakeLock(ss);
    ssl_GetSSL3HandshakeLock(ss);

    switch (which) {
        case SSL_SOCKS:
            ss->opt.useSocks = PR_FALSE;
            rv = PrepareSocket(ss);
            if (val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
            }
            break;

        case SSL_SECURITY:
            ss->opt.useSecurity = val;
            rv = PrepareSocket(ss);
            break;

        case SSL_REQUEST_CERTIFICATE:
            ss->opt.requestCertificate = val;
            break;

        case SSL_REQUIRE_CERTIFICATE:
            ss->opt.requireCertificate = val;
            break;

        case SSL_HANDSHAKE_AS_CLIENT:
            if (ss->opt.handshakeAsServer && val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
                break;
            }
            ss->opt.handshakeAsClient = val;
            break;

        case SSL_HANDSHAKE_AS_SERVER:
            if (ss->opt.handshakeAsClient && val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
                break;
            }
            ss->opt.handshakeAsServer = val;
            break;

        case SSL_ENABLE_TLS:
            if (IS_DTLS(ss)) {
                if (val) {
                    PORT_SetError(SEC_ERROR_INVALID_ARGS);
                    rv = SECFailure; /* not allowed */
                }
                break;
            }
            ssl_EnableTLS(&ss->vrange, val);
            break;

        case SSL_ENABLE_SSL3:
            if (IS_DTLS(ss)) {
                if (val) {
                    PORT_SetError(SEC_ERROR_INVALID_ARGS);
                    rv = SECFailure; /* not allowed */
                }
                break;
            }
            ssl_EnableSSL3(&ss->vrange, val);
            break;

        case SSL_ENABLE_SSL2:
        case SSL_V2_COMPATIBLE_HELLO:
            /* We no longer support SSL v2.
             * However, if an old application requests to disable SSL v2,
             * we shouldn't fail.
             */
            if (val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
            }
            break;

        case SSL_NO_CACHE:
            ss->opt.noCache = val;
            break;

        case SSL_ENABLE_FDX:
            if (val && ss->opt.noLocks) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
            }
            ss->opt.fdx = val;
            break;

        case SSL_ROLLBACK_DETECTION:
            ss->opt.detectRollBack = val;
            break;

        case SSL_NO_STEP_DOWN:
            break;

        case SSL_BYPASS_PKCS11:
            break;

        case SSL_NO_LOCKS:
            if (val && ss->opt.fdx) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
            }
            if (val && ssl_force_locks)
                val = PR_FALSE; /* silent override */
            ss->opt.noLocks = val;
            if (!val && !holdingLocks) {
                rv = ssl_MakeLocks(ss);
                if (rv != SECSuccess) {
                    ss->opt.noLocks = PR_TRUE;
                }
            }
            break;

        case SSL_ENABLE_SESSION_TICKETS:
            ss->opt.enableSessionTickets = val;
            break;

        case SSL_ENABLE_DEFLATE:
            ss->opt.enableDeflate = val;
            break;

        case SSL_ENABLE_RENEGOTIATION:
            if (IS_DTLS(ss) && val != SSL_RENEGOTIATE_NEVER) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
                break;
            }
            ss->opt.enableRenegotiation = val;
            break;

        case SSL_REQUIRE_SAFE_NEGOTIATION:
            ss->opt.requireSafeNegotiation = val;
            break;

        case SSL_ENABLE_FALSE_START:
            ss->opt.enableFalseStart = val;
            break;

        case SSL_CBC_RANDOM_IV:
            ss->opt.cbcRandomIV = val;
            break;

        case SSL_ENABLE_OCSP_STAPLING:
            ss->opt.enableOCSPStapling = val;
            break;

        case SSL_ENABLE_DELEGATED_CREDENTIALS:
            ss->opt.enableDelegatedCredentials = val;
            break;

        case SSL_ENABLE_NPN:
            break;

        case SSL_ENABLE_ALPN:
            ss->opt.enableALPN = val;
            break;

        case SSL_REUSE_SERVER_ECDHE_KEY:
            ss->opt.reuseServerECDHEKey = val;
            break;

        case SSL_ENABLE_FALLBACK_SCSV:
            ss->opt.enableFallbackSCSV = val;
            break;

        case SSL_ENABLE_SERVER_DHE:
            ss->opt.enableServerDhe = val;
            break;

        case SSL_ENABLE_EXTENDED_MASTER_SECRET:
            ss->opt.enableExtendedMS = val;
            break;

        case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
            ss->opt.enableSignedCertTimestamps = val;
            break;

        case SSL_REQUIRE_DH_NAMED_GROUPS:
            ss->opt.requireDHENamedGroups = val;
            break;

        case SSL_ENABLE_0RTT_DATA:
            ss->opt.enable0RttData = val;
            break;

        case SSL_RECORD_SIZE_LIMIT:
            if (val < 64 || val > (MAX_FRAGMENT_LENGTH + 1)) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                rv = SECFailure;
            } else {
                ss->opt.recordSizeLimit = val;
            }
            break;

        case SSL_ENABLE_TLS13_COMPAT_MODE:
            ss->opt.enableTls13CompatMode = val;
            break;

        case SSL_ENABLE_DTLS_SHORT_HEADER:
            ss->opt.enableDtlsShortHeader = val;
            break;

        case SSL_ENABLE_HELLO_DOWNGRADE_CHECK:
            ss->opt.enableHelloDowngradeCheck = val;
            break;

        case SSL_ENABLE_V2_COMPATIBLE_HELLO:
            ss->opt.enableV2CompatibleHello = val;
            break;

        case SSL_ENABLE_POST_HANDSHAKE_AUTH:
            ss->opt.enablePostHandshakeAuth = val;
            break;

        case SSL_SUPPRESS_END_OF_EARLY_DATA:
            ss->opt.suppressEndOfEarlyData = val;
            break;

        case SSL_ENABLE_GREASE:
            ss->opt.enableGrease = val;
            break;

        case SSL_ENABLE_CH_EXTENSION_PERMUTATION:
            ss->opt.enableChXtnPermutation = val;
            break;

        default:
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            rv = SECFailure;
    }

    /* We can't use the macros for releasing the locks here,
     * because ss->opt.noLocks might have changed just above.
     * We must release these locks (monitors) here, if we aquired them above,
     * regardless of the current value of ss->opt.noLocks.
     */
    if (holdingLocks) {
        PZ_ExitMonitor((ss)->ssl3HandshakeLock);
        PZ_ExitMonitor((ss)->firstHandshakeLock);
    }

    return rv;
}

SECStatus
SSL_OptionGet(PRFileDesc *fd, PRInt32 which, PRIntn *pVal)
{
    sslSocket *ss = ssl_FindSocket(fd);
    SECStatus rv = SECSuccess;
    PRIntn val = PR_FALSE;

    if (!pVal) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in Enable", SSL_GETPID(), fd));
        *pVal = PR_FALSE;
        return SECFailure;
    }

    ssl_Get1stHandshakeLock(ss);
    ssl_GetSSL3HandshakeLock(ss);

    switch (which) {
        case SSL_SOCKS:
            val = PR_FALSE;
            break;
        case SSL_SECURITY:
            val = ss->opt.useSecurity;
            break;
        case SSL_REQUEST_CERTIFICATE:
            val = ss->opt.requestCertificate;
            break;
        case SSL_REQUIRE_CERTIFICATE:
            val = ss->opt.requireCertificate;
            break;
        case SSL_HANDSHAKE_AS_CLIENT:
            val = ss->opt.handshakeAsClient;
            break;
        case SSL_HANDSHAKE_AS_SERVER:
            val = ss->opt.handshakeAsServer;
            break;
        case SSL_ENABLE_TLS:
            val = ss->vrange.max >= SSL_LIBRARY_VERSION_TLS_1_0;
            break;
        case SSL_ENABLE_SSL3:
            val = ss->vrange.min == SSL_LIBRARY_VERSION_3_0;
            break;
        case SSL_ENABLE_SSL2:
        case SSL_V2_COMPATIBLE_HELLO:
            val = PR_FALSE;
            break;
        case SSL_NO_CACHE:
            val = ss->opt.noCache;
            break;
        case SSL_ENABLE_FDX:
            val = ss->opt.fdx;
            break;
        case SSL_ROLLBACK_DETECTION:
            val = ss->opt.detectRollBack;
            break;
        case SSL_NO_STEP_DOWN:
            val = PR_FALSE;
            break;
        case SSL_BYPASS_PKCS11:
            val = PR_FALSE;
            break;
        case SSL_NO_LOCKS:
            val = ss->opt.noLocks;
            break;
        case SSL_ENABLE_SESSION_TICKETS:
            val = ss->opt.enableSessionTickets;
            break;
        case SSL_ENABLE_DEFLATE:
            val = ss->opt.enableDeflate;
            break;
        case SSL_ENABLE_RENEGOTIATION:
            val = ss->opt.enableRenegotiation;
            break;
        case SSL_REQUIRE_SAFE_NEGOTIATION:
            val = ss->opt.requireSafeNegotiation;
            break;
        case SSL_ENABLE_FALSE_START:
            val = ss->opt.enableFalseStart;
            break;
        case SSL_CBC_RANDOM_IV:
            val = ss->opt.cbcRandomIV;
            break;
        case SSL_ENABLE_OCSP_STAPLING:
            val = ss->opt.enableOCSPStapling;
            break;
        case SSL_ENABLE_DELEGATED_CREDENTIALS:
            val = ss->opt.enableDelegatedCredentials;
            break;
        case SSL_ENABLE_NPN:
            val = PR_FALSE;
            break;
        case SSL_ENABLE_ALPN:
            val = ss->opt.enableALPN;
            break;
        case SSL_REUSE_SERVER_ECDHE_KEY:
            val = ss->opt.reuseServerECDHEKey;
            break;
        case SSL_ENABLE_FALLBACK_SCSV:
            val = ss->opt.enableFallbackSCSV;
            break;
        case SSL_ENABLE_SERVER_DHE:
            val = ss->opt.enableServerDhe;
            break;
        case SSL_ENABLE_EXTENDED_MASTER_SECRET:
            val = ss->opt.enableExtendedMS;
            break;
        case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
            val = ss->opt.enableSignedCertTimestamps;
            break;
        case SSL_REQUIRE_DH_NAMED_GROUPS:
            val = ss->opt.requireDHENamedGroups;
            break;
        case SSL_ENABLE_0RTT_DATA:
            val = ss->opt.enable0RttData;
            break;
        case SSL_RECORD_SIZE_LIMIT:
            val = ss->opt.recordSizeLimit;
            break;
        case SSL_ENABLE_TLS13_COMPAT_MODE:
            val = ss->opt.enableTls13CompatMode;
            break;
        case SSL_ENABLE_DTLS_SHORT_HEADER:
            val = ss->opt.enableDtlsShortHeader;
            break;
        case SSL_ENABLE_HELLO_DOWNGRADE_CHECK:
            val = ss->opt.enableHelloDowngradeCheck;
            break;
        case SSL_ENABLE_V2_COMPATIBLE_HELLO:
            val = ss->opt.enableV2CompatibleHello;
            break;
        case SSL_ENABLE_POST_HANDSHAKE_AUTH:
            val = ss->opt.enablePostHandshakeAuth;
            break;
        case SSL_SUPPRESS_END_OF_EARLY_DATA:
            val = ss->opt.suppressEndOfEarlyData;
            break;
        default:
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            rv = SECFailure;
    }

    ssl_ReleaseSSL3HandshakeLock(ss);
    ssl_Release1stHandshakeLock(ss);

    *pVal = val;
    return rv;
}

SECStatus
SSL_OptionGetDefault(PRInt32 which, PRIntn *pVal)
{
    SECStatus rv = SECSuccess;
    PRIntn val = PR_FALSE;

    if (!pVal) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    ssl_SetDefaultsFromEnvironment();

    switch (which) {
        case SSL_SOCKS:
            val = PR_FALSE;
            break;
        case SSL_SECURITY:
            val = ssl_defaults.useSecurity;
            break;
        case SSL_REQUEST_CERTIFICATE:
            val = ssl_defaults.requestCertificate;
            break;
        case SSL_REQUIRE_CERTIFICATE:
            val = ssl_defaults.requireCertificate;
            break;
        case SSL_HANDSHAKE_AS_CLIENT:
            val = ssl_defaults.handshakeAsClient;
            break;
        case SSL_HANDSHAKE_AS_SERVER:
            val = ssl_defaults.handshakeAsServer;
            break;
        case SSL_ENABLE_TLS:
            val = versions_defaults_stream.max >= SSL_LIBRARY_VERSION_TLS_1_0;
            break;
        case SSL_ENABLE_SSL3:
            val = versions_defaults_stream.min == SSL_LIBRARY_VERSION_3_0;
            break;
        case SSL_ENABLE_SSL2:
        case SSL_V2_COMPATIBLE_HELLO:
            val = PR_FALSE;
            break;
        case SSL_NO_CACHE:
            val = ssl_defaults.noCache;
            break;
        case SSL_ENABLE_FDX:
            val = ssl_defaults.fdx;
            break;
        case SSL_ROLLBACK_DETECTION:
            val = ssl_defaults.detectRollBack;
            break;
        case SSL_NO_STEP_DOWN:
            val = PR_FALSE;
            break;
        case SSL_BYPASS_PKCS11:
            val = PR_FALSE;
            break;
        case SSL_NO_LOCKS:
            val = ssl_defaults.noLocks;
            break;
        case SSL_ENABLE_SESSION_TICKETS:
            val = ssl_defaults.enableSessionTickets;
            break;
        case SSL_ENABLE_DEFLATE:
            val = ssl_defaults.enableDeflate;
            break;
        case SSL_ENABLE_RENEGOTIATION:
            val = ssl_defaults.enableRenegotiation;
            break;
        case SSL_REQUIRE_SAFE_NEGOTIATION:
            val = ssl_defaults.requireSafeNegotiation;
            break;
        case SSL_ENABLE_FALSE_START:
            val = ssl_defaults.enableFalseStart;
            break;
        case SSL_CBC_RANDOM_IV:
            val = ssl_defaults.cbcRandomIV;
            break;
        case SSL_ENABLE_OCSP_STAPLING:
            val = ssl_defaults.enableOCSPStapling;
            break;
        case SSL_ENABLE_DELEGATED_CREDENTIALS:
            val = ssl_defaults.enableDelegatedCredentials;
            break;
        case SSL_ENABLE_NPN:
            val = PR_FALSE;
            break;
        case SSL_ENABLE_ALPN:
            val = ssl_defaults.enableALPN;
            break;
        case SSL_REUSE_SERVER_ECDHE_KEY:
            val = ssl_defaults.reuseServerECDHEKey;
            break;
        case SSL_ENABLE_FALLBACK_SCSV:
            val = ssl_defaults.enableFallbackSCSV;
            break;
        case SSL_ENABLE_SERVER_DHE:
            val = ssl_defaults.enableServerDhe;
            break;
        case SSL_ENABLE_EXTENDED_MASTER_SECRET:
            val = ssl_defaults.enableExtendedMS;
            break;
        case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
            val = ssl_defaults.enableSignedCertTimestamps;
            break;
        case SSL_ENABLE_0RTT_DATA:
            val = ssl_defaults.enable0RttData;
            break;
        case SSL_RECORD_SIZE_LIMIT:
            val = ssl_defaults.recordSizeLimit;
            break;
        case SSL_ENABLE_TLS13_COMPAT_MODE:
            val = ssl_defaults.enableTls13CompatMode;
            break;
        case SSL_ENABLE_DTLS_SHORT_HEADER:
            val = ssl_defaults.enableDtlsShortHeader;
            break;
        case SSL_ENABLE_HELLO_DOWNGRADE_CHECK:
            val = ssl_defaults.enableHelloDowngradeCheck;
            break;
        case SSL_ENABLE_V2_COMPATIBLE_HELLO:
            val = ssl_defaults.enableV2CompatibleHello;
            break;
        case SSL_ENABLE_POST_HANDSHAKE_AUTH:
            val = ssl_defaults.enablePostHandshakeAuth;
            break;
        case SSL_SUPPRESS_END_OF_EARLY_DATA:
            val = ssl_defaults.suppressEndOfEarlyData;
            break;
        default:
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            rv = SECFailure;
    }

    *pVal = val;
    return rv;
}

/* XXX Use Global Lock to protect this stuff. */
SECStatus
SSL_EnableDefault(int which, PRIntn val)
{
    return SSL_OptionSetDefault(which, val);
}

SECStatus
SSL_OptionSetDefault(PRInt32 which, PRIntn val)
{
    SECStatus status = ssl_Init();

    if (status != SECSuccess) {
        return status;
    }

    ssl_SetDefaultsFromEnvironment();

    switch (which) {
        case SSL_SOCKS:
            ssl_defaults.useSocks = PR_FALSE;
            if (val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            break;

        case SSL_SECURITY:
            ssl_defaults.useSecurity = val;
            break;

        case SSL_REQUEST_CERTIFICATE:
            ssl_defaults.requestCertificate = val;
            break;

        case SSL_REQUIRE_CERTIFICATE:
            ssl_defaults.requireCertificate = val;
            break;

        case SSL_HANDSHAKE_AS_CLIENT:
            if (ssl_defaults.handshakeAsServer && val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            ssl_defaults.handshakeAsClient = val;
            break;

        case SSL_HANDSHAKE_AS_SERVER:
            if (ssl_defaults.handshakeAsClient && val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            ssl_defaults.handshakeAsServer = val;
            break;

        case SSL_ENABLE_TLS:
            ssl_EnableTLS(&versions_defaults_stream, val);
            break;

        case SSL_ENABLE_SSL3:
            ssl_EnableSSL3(&versions_defaults_stream, val);
            break;

        case SSL_ENABLE_SSL2:
        case SSL_V2_COMPATIBLE_HELLO:
            /* We no longer support SSL v2.
             * However, if an old application requests to disable SSL v2,
             * we shouldn't fail.
             */
            if (val) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            break;

        case SSL_NO_CACHE:
            ssl_defaults.noCache = val;
            break;

        case SSL_ENABLE_FDX:
            if (val && ssl_defaults.noLocks) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            ssl_defaults.fdx = val;
            break;

        case SSL_ROLLBACK_DETECTION:
            ssl_defaults.detectRollBack = val;
            break;

        case SSL_NO_STEP_DOWN:
            break;

        case SSL_BYPASS_PKCS11:
            break;

        case SSL_NO_LOCKS:
            if (val && ssl_defaults.fdx) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            if (val && ssl_force_locks)
                val = PR_FALSE; /* silent override */
            ssl_defaults.noLocks = val;
            break;

        case SSL_ENABLE_SESSION_TICKETS:
            ssl_defaults.enableSessionTickets = val;
            break;

        case SSL_ENABLE_DEFLATE:
            ssl_defaults.enableDeflate = val;
            break;

        case SSL_ENABLE_RENEGOTIATION:
            ssl_defaults.enableRenegotiation = val;
            break;

        case SSL_REQUIRE_SAFE_NEGOTIATION:
            ssl_defaults.requireSafeNegotiation = val;
            break;

        case SSL_ENABLE_FALSE_START:
            ssl_defaults.enableFalseStart = val;
            break;

        case SSL_CBC_RANDOM_IV:
            ssl_defaults.cbcRandomIV = val;
            break;

        case SSL_ENABLE_OCSP_STAPLING:
            ssl_defaults.enableOCSPStapling = val;
            break;

        case SSL_ENABLE_DELEGATED_CREDENTIALS:
            ssl_defaults.enableDelegatedCredentials = val;
            break;

        case SSL_ENABLE_NPN:
            break;

        case SSL_ENABLE_ALPN:
            ssl_defaults.enableALPN = val;
            break;

        case SSL_REUSE_SERVER_ECDHE_KEY:
            ssl_defaults.reuseServerECDHEKey = val;
            break;

        case SSL_ENABLE_FALLBACK_SCSV:
            ssl_defaults.enableFallbackSCSV = val;
            break;

        case SSL_ENABLE_SERVER_DHE:
            ssl_defaults.enableServerDhe = val;
            break;

        case SSL_ENABLE_EXTENDED_MASTER_SECRET:
            ssl_defaults.enableExtendedMS = val;
            break;

        case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
            ssl_defaults.enableSignedCertTimestamps = val;
            break;

        case SSL_ENABLE_0RTT_DATA:
            ssl_defaults.enable0RttData = val;
            break;

        case SSL_RECORD_SIZE_LIMIT:
            if (val < 64 || val > (MAX_FRAGMENT_LENGTH + 1)) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
            }
            ssl_defaults.recordSizeLimit = val;
            break;

        case SSL_ENABLE_TLS13_COMPAT_MODE:
            ssl_defaults.enableTls13CompatMode = val;
            break;

        case SSL_ENABLE_DTLS_SHORT_HEADER:
            ssl_defaults.enableDtlsShortHeader = val;
            break;

        case SSL_ENABLE_HELLO_DOWNGRADE_CHECK:
            ssl_defaults.enableHelloDowngradeCheck = val;
            break;

        case SSL_ENABLE_V2_COMPATIBLE_HELLO:
            ssl_defaults.enableV2CompatibleHello = val;
            break;

        case SSL_ENABLE_POST_HANDSHAKE_AUTH:
            ssl_defaults.enablePostHandshakeAuth = val;
            break;

        case SSL_SUPPRESS_END_OF_EARLY_DATA:
            ssl_defaults.suppressEndOfEarlyData = val;
            break;

        default:
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            return SECFailure;
    }
    return SECSuccess;
}

SECStatus
SSLExp_SetMaxEarlyDataSize(PRFileDesc *fd, PRUint32 size)
{
    sslSocket *ss = ssl_FindSocket(fd);
    if (!ss) {
        return SECFailure; /* Error code already set. */
    }

    ss->opt.maxEarlyDataSize = size;
    return SECSuccess;
}

/* function tells us if the cipher suite is one that we no longer support. */
static PRBool
ssl_IsRemovedCipherSuite(PRInt32 suite)
{
    switch (suite) {
        case SSL_FORTEZZA_DMS_WITH_NULL_SHA:
        case SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA:
        case SSL_FORTEZZA_DMS_WITH_RC4_128_SHA:
            return PR_TRUE;
        default:
            return PR_FALSE;
    }
}

/* Part of the public NSS API.
 * Since this is a global (not per-socket) setting, we cannot use the
 * HandshakeLock to protect this.  Probably want a global lock.
 */
SECStatus
SSL_SetPolicy(long which, int policy)
{
    if (ssl_IsRemovedCipherSuite(which))
        return SECSuccess;
    return SSL_CipherPolicySet(which, policy);
}

SECStatus
ssl_CipherPolicySet(PRInt32 which, PRInt32 policy)
{
    SECStatus rv = SECSuccess;

    if (ssl_IsRemovedCipherSuite(which)) {
        rv = SECSuccess;
    } else {
        rv = ssl3_SetPolicy((ssl3CipherSuite)which, policy);
    }
    return rv;
}
SECStatus
SSL_CipherPolicySet(PRInt32 which, PRInt32 policy)
{
    SECStatus rv = ssl_Init();

    if (rv != SECSuccess) {
        return rv;
    }
    if (NSS_IsPolicyLocked()) {
        PORT_SetError(SEC_ERROR_POLICY_LOCKED);
        return SECFailure;
    }
    return ssl_CipherPolicySet(which, policy);
}

SECStatus
SSL_CipherPolicyGet(PRInt32 which, PRInt32 *oPolicy)
{
    SECStatus rv;

    if (!oPolicy) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (ssl_IsRemovedCipherSuite(which)) {
        *oPolicy = SSL_NOT_ALLOWED;
        rv = SECSuccess;
    } else {
        rv = ssl3_GetPolicy((ssl3CipherSuite)which, oPolicy);
    }
    return rv;
}

/* Part of the public NSS API.
 * Since this is a global (not per-socket) setting, we cannot use the
 * HandshakeLock to protect this.  Probably want a global lock.
 * These changes have no effect on any sslSockets already created.
 */
SECStatus
SSL_EnableCipher(long which, PRBool enabled)
{
    if (ssl_IsRemovedCipherSuite(which))
        return SECSuccess;
    return SSL_CipherPrefSetDefault(which, enabled);
}

SECStatus
ssl_CipherPrefSetDefault(PRInt32 which, PRBool enabled)
{
    if (ssl_IsRemovedCipherSuite(which))
        return SECSuccess;
    return ssl3_CipherPrefSetDefault((ssl3CipherSuite)which, enabled);
}

SECStatus
SSL_CipherPrefSetDefault(PRInt32 which, PRBool enabled)
{
    SECStatus rv = ssl_Init();
    PRInt32 locks;

    if (rv != SECSuccess) {
        return rv;
    }
    rv = NSS_OptionGet(NSS_DEFAULT_LOCKS, &locks);
    if ((rv == SECSuccess) && (locks & NSS_DEFAULT_SSL_LOCK)) {
        return SECSuccess;
    }
    return ssl_CipherPrefSetDefault(which, enabled);
}

SECStatus
SSL_CipherPrefGetDefault(PRInt32 which, PRBool *enabled)
{
    SECStatus rv;

    if (!enabled) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (ssl_IsRemovedCipherSuite(which)) {
        *enabled = PR_FALSE;
        rv = SECSuccess;
    } else {
        rv = ssl3_CipherPrefGetDefault((ssl3CipherSuite)which, enabled);
    }
    return rv;
}

SECStatus
SSL_CipherPrefSet(PRFileDesc *fd, PRInt32 which, PRBool enabled)
{
    sslSocket *ss = ssl_FindSocket(fd);
    PRInt32 locks;
    SECStatus rv;

    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in CipherPrefSet", SSL_GETPID(), fd));
        return SECFailure;
    }
    rv = NSS_OptionGet(NSS_DEFAULT_LOCKS, &locks);
    if ((rv == SECSuccess) && (locks & NSS_DEFAULT_SSL_LOCK)) {
        return SECSuccess;
    }
    if (ssl_IsRemovedCipherSuite(which))
        return SECSuccess;
    return ssl3_CipherPrefSet(ss, (ssl3CipherSuite)which, enabled);
}

SECStatus
SSL_CipherPrefGet(PRFileDesc *fd, PRInt32 which, PRBool *enabled)
{
    SECStatus rv;
    sslSocket *ss = ssl_FindSocket(fd);

    if (!enabled) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in CipherPrefGet", SSL_GETPID(), fd));
        *enabled = PR_FALSE;
        return SECFailure;
    }
    if (ssl_IsRemovedCipherSuite(which)) {
        *enabled = PR_FALSE;
        rv = SECSuccess;
    } else {
        rv = ssl3_CipherPrefGet(ss, (ssl3CipherSuite)which, enabled);
    }
    return rv;
}

/* The client can call this function to be aware of the current
 * CipherSuites order. */
SECStatus
SSLExp_CipherSuiteOrderGet(PRFileDesc *fd, PRUint16 *cipherOrder,
                           unsigned int *numCiphers)
{
    if (!fd) {
        SSL_DBG(("%d: SSL: file descriptor in CipherSuiteOrderGet is null",
                 SSL_GETPID()));
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (!cipherOrder || !numCiphers) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    sslSocket *ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in CipherSuiteOrderGet", SSL_GETPID(),
                 fd));
        return SECFailure; /* Error code already set. */
    }

    unsigned int enabled = 0;
    ssl_Get1stHandshakeLock(ss);
    ssl_GetSSL3HandshakeLock(ss);
    for (unsigned int i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        const ssl3CipherSuiteCfg *suiteCfg = &ss->cipherSuites[i];
        if (suiteCfg && suiteCfg->enabled &&
            suiteCfg->policy != SSL_NOT_ALLOWED) {
            cipherOrder[enabled++] = suiteCfg->cipher_suite;
        }
    }
    ssl_ReleaseSSL3HandshakeLock(ss);
    ssl_Release1stHandshakeLock(ss);
    *numCiphers = enabled;
    return SECSuccess;
}

/* This function permits reorder the CipherSuites List for the Handshake
 * (Client Hello). */
SECStatus
SSLExp_CipherSuiteOrderSet(PRFileDesc *fd, const PRUint16 *cipherOrder,
                           PRUint16 numCiphers)
{
    if (!fd) {
        SSL_DBG(("%d: SSL: file descriptor in CipherSuiteOrderGet is null",
                 SSL_GETPID()));
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (!cipherOrder || !numCiphers || numCiphers > ssl_V3_SUITES_IMPLEMENTED) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    sslSocket *ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in CipherSuiteOrderSet", SSL_GETPID(),
                 fd));
        return SECFailure; /* Error code already set. */
    }
    ssl3CipherSuiteCfg tmpSuiteCfg[ssl_V3_SUITES_IMPLEMENTED];
    ssl_Get1stHandshakeLock(ss);
    ssl_GetSSL3HandshakeLock(ss);
    /* For each cipherSuite given as input, verify that it is
     * known to NSS and only present in the list once. */
    for (unsigned int i = 0; i < numCiphers; i++) {
        const ssl3CipherSuiteCfg *suiteCfg =
            ssl_LookupCipherSuiteCfg(cipherOrder[i], ss->cipherSuites);
        if (!suiteCfg) {
            PORT_SetError(SEC_ERROR_INVALID_ARGS);
            ssl_ReleaseSSL3HandshakeLock(ss);
            ssl_Release1stHandshakeLock(ss);
            return SECFailure;
        }
        for (unsigned int j = i + 1; j < numCiphers; j++) {
            /* This is a duplicate entry. */
            if (cipherOrder[i] == cipherOrder[j]) {
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                ssl_ReleaseSSL3HandshakeLock(ss);
                ssl_Release1stHandshakeLock(ss);
                return SECFailure;
            }
        }
        tmpSuiteCfg[i] = *suiteCfg;
        tmpSuiteCfg[i].enabled = PR_TRUE;
    }
    /* Find all defined ciphersuites not present in the input list and append
     * them after the preferred. This guarantees that the socket will always
     * have a complete list of size ssl_V3_SUITES_IMPLEMENTED */
    unsigned int cfgIdx = numCiphers;
    for (unsigned int i = 0; i < ssl_V3_SUITES_IMPLEMENTED; i++) {
        PRBool received = PR_FALSE;
        for (unsigned int j = 0; j < numCiphers; j++) {
            if (ss->cipherSuites[i].cipher_suite ==
                tmpSuiteCfg[j].cipher_suite) {
                received = PR_TRUE;
                break;
            }
        }
        if (!received) {
            tmpSuiteCfg[cfgIdx] = ss->cipherSuites[i];
            tmpSuiteCfg[cfgIdx++].enabled = PR_FALSE;
        }
    }
    PORT_Assert(cfgIdx == ssl_V3_SUITES_IMPLEMENTED);
    /* now we can rewrite the socket with the desired order */
    PORT_Memcpy(ss->cipherSuites, tmpSuiteCfg, sizeof(tmpSuiteCfg));
    ssl_ReleaseSSL3HandshakeLock(ss);
    ssl_Release1stHandshakeLock(ss);
    return SECSuccess;
}

SECStatus
NSS_SetDomesticPolicy(void)
{
    SECStatus status = SECSuccess;
    const PRUint16 *cipher;
    SECStatus rv;
    PRUint32 policy;

    /* If we've already defined some policy oids, skip changing them */
    rv = NSS_GetAlgorithmPolicy(SEC_OID_APPLY_SSL_POLICY, &policy);
    if ((rv == SECSuccess) && (policy & NSS_USE_POLICY_IN_SSL)) {
        return ssl_Init(); /* make sure the policies have been loaded */
    }

    for (cipher = SSL_ImplementedCiphers; *cipher != 0; ++cipher) {
        status = SSL_SetPolicy(*cipher, SSL_ALLOWED);
        if (status != SECSuccess)
            break;
    }
    return status;
}

SECStatus
NSS_SetExportPolicy(void)
{
    return NSS_SetDomesticPolicy();
}

SECStatus
NSS_SetFrancePolicy(void)
{
    return NSS_SetDomesticPolicy();
}

SECStatus
SSL_NamedGroupConfig(PRFileDesc *fd, const SSLNamedGroup *groups,
                     unsigned int numGroups)
{
    unsigned int i;
    unsigned int j = 0;
    sslSocket *ss = ssl_FindSocket(fd);

    if (!ss) {
        PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
        return SECFailure;
    }

    if (!groups) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }
    if (numGroups > SSL_NAMED_GROUP_COUNT) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    memset((void *)ss->namedGroupPreferences, 0,
           sizeof(ss->namedGroupPreferences));
    for (i = 0; i < numGroups; ++i) {
        const sslNamedGroupDef *groupDef = ssl_LookupNamedGroup(groups[i]);
        if (!ssl_NamedGroupEnabled(ss, groupDef)) {
            ss->namedGroupPreferences[j++] = groupDef;
        }
    }

    return SECSuccess;
}

SECStatus
SSL_DHEGroupPrefSet(PRFileDesc *fd, const SSLDHEGroupType *groups,
                    PRUint16 num_groups)
{
    sslSocket *ss;
    const SSLDHEGroupType *list;
    unsigned int count;
    int i, k, j;
    const sslNamedGroupDef *enabled[SSL_NAMED_GROUP_COUNT] = { 0 };
    static const SSLDHEGroupType default_dhe_groups[] = {
        ssl_ff_dhe_2048_group
    };

    if ((num_groups && !groups) || (!num_groups && groups) ||
        num_groups > SSL_NAMED_GROUP_COUNT) {
        PORT_SetError(SEC_ERROR_INVALID_ARGS);
        return SECFailure;
    }

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_DHEGroupPrefSet", SSL_GETPID(), fd));
        return SECFailure;
    }

    if (groups) {
        list = groups;
        count = num_groups;
    } else {
        list = default_dhe_groups;
        count = PR_ARRAY_SIZE(default_dhe_groups);
    }

    /* save enabled ec groups and clear ss->namedGroupPreferences */
    k = 0;
    for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
        if (ss->namedGroupPreferences[i] &&
            ss->namedGroupPreferences[i]->keaType != ssl_kea_dh) {
            enabled[k++] = ss->namedGroupPreferences[i];
        }
        ss->namedGroupPreferences[i] = NULL;
    }

    ss->ssl3.dhePreferredGroup = NULL;
    for (i = 0; i < count; ++i) {
        PRBool duplicate = PR_FALSE;
        SSLNamedGroup name;
        const sslNamedGroupDef *groupDef;
        switch (list[i]) {
            case ssl_ff_dhe_2048_group:
                name = ssl_grp_ffdhe_2048;
                break;
            case ssl_ff_dhe_3072_group:
                name = ssl_grp_ffdhe_3072;
                break;
            case ssl_ff_dhe_4096_group:
                name = ssl_grp_ffdhe_4096;
                break;
            case ssl_ff_dhe_6144_group:
                name = ssl_grp_ffdhe_6144;
                break;
            case ssl_ff_dhe_8192_group:
                name = ssl_grp_ffdhe_8192;
                break;
            default:
                PORT_SetError(SEC_ERROR_INVALID_ARGS);
                return SECFailure;
        }
        groupDef = ssl_LookupNamedGroup(name);
        PORT_Assert(groupDef);
        if (!ss->ssl3.dhePreferredGroup) {
            ss->ssl3.dhePreferredGroup = groupDef;
        }
        PORT_Assert(k < SSL_NAMED_GROUP_COUNT);
        for (j = 0; j < k; ++j) {
            /* skip duplicates */
            if (enabled[j] == groupDef) {
                duplicate = PR_TRUE;
                break;
            }
        }
        if (!duplicate) {
            enabled[k++] = groupDef;
        }
    }
    for (i = 0; i < k; ++i) {
        ss->namedGroupPreferences[i] = enabled[i];
    }

    return SECSuccess;
}

PRCallOnceType gWeakDHParamsRegisterOnce;
int gWeakDHParamsRegisterError;

PRCallOnceType gWeakDHParamsOnce;
int gWeakDHParamsError;
/* As our code allocates type PQGParams, we'll keep it around,
 * even though we only make use of it's parameters through gWeakDHParam. */
static PQGParams *gWeakParamsPQG;
static ssl3DHParams *gWeakDHParams;
#define WEAK_DHE_SIZE 1024

static PRStatus
ssl3_CreateWeakDHParams(void)
{
    PQGVerify *vfy;
    SECStatus rv, passed;

    PORT_Assert(!gWeakDHParams && !gWeakParamsPQG);

    rv = PK11_PQG_ParamGenV2(WEAK_DHE_SIZE, 160, 64 /*maximum seed that will work*/,
                             &gWeakParamsPQG, &vfy);
    if (rv != SECSuccess) {
        gWeakDHParamsError = PORT_GetError();
        return PR_FAILURE;
    }

    rv = PK11_PQG_VerifyParams(gWeakParamsPQG, vfy, &passed);
    if (rv != SECSuccess || passed != SECSuccess) {
        SSL_DBG(("%d: PK11_PQG_VerifyParams failed in ssl3_CreateWeakDHParams",
                 SSL_GETPID()));
        gWeakDHParamsError = PORT_GetError();
        return PR_FAILURE;
    }

    gWeakDHParams = PORT_ArenaNew(gWeakParamsPQG->arena, ssl3DHParams);
    if (!gWeakDHParams) {
        gWeakDHParamsError = PORT_GetError();
        return PR_FAILURE;
    }

    gWeakDHParams->name = ssl_grp_ffdhe_custom;
    gWeakDHParams->prime.data = gWeakParamsPQG->prime.data;
    gWeakDHParams->prime.len = gWeakParamsPQG->prime.len;
    gWeakDHParams->base.data = gWeakParamsPQG->base.data;
    gWeakDHParams->base.len = gWeakParamsPQG->base.len;

    PK11_PQG_DestroyVerify(vfy);
    return PR_SUCCESS;
}

static SECStatus
ssl3_WeakDHParamsShutdown(void *appData, void *nssData)
{
    if (gWeakParamsPQG) {
        PK11_PQG_DestroyParams(gWeakParamsPQG);
        gWeakParamsPQG = NULL;
        gWeakDHParams = NULL;
    }
    return SECSuccess;
}

static PRStatus
ssl3_WeakDHParamsRegisterShutdown(void)
{
    SECStatus rv;
    rv = NSS_RegisterShutdown(ssl3_WeakDHParamsShutdown, NULL);
    if (rv != SECSuccess) {
        gWeakDHParamsRegisterError = PORT_GetError();
    }
    return (PRStatus)rv;
}

/* global init strategy inspired by ssl3_CreateECDHEphemeralKeys */
SECStatus
SSL_EnableWeakDHEPrimeGroup(PRFileDesc *fd, PRBool enabled)
{
    sslSocket *ss;
    PRStatus status;

    if (enabled) {
        status = PR_CallOnce(&gWeakDHParamsRegisterOnce,
                             ssl3_WeakDHParamsRegisterShutdown);
        if (status != PR_SUCCESS) {
            PORT_SetError(gWeakDHParamsRegisterError);
            return SECFailure;
        }

        status = PR_CallOnce(&gWeakDHParamsOnce, ssl3_CreateWeakDHParams);
        if (status != PR_SUCCESS) {
            PORT_SetError(gWeakDHParamsError);
            return SECFailure;
        }
    }

    if (!fd)
        return SECSuccess;

    ss = ssl_FindSocket(fd);
    if (!ss) {
        SSL_DBG(("%d: SSL[%d]: bad socket in SSL_DHEGroupPrefSet", SSL_GETPID(), fd));
        return SECFailure;
    }

    ss->ssl3.dheWeakGroupEnabled = enabled;
    return SECSuccess;
}

#include "dhe-param.c"

const ssl3DHParams *
ssl_GetDHEParams(const sslNamedGroupDef *groupDef)
{
    switch (groupDef->name) {
        case ssl_grp_ffdhe_2048:
            return &ff_dhe_2048_params;
        case ssl_grp_ffdhe_3072:
            return &ff_dhe_3072_params;
        case ssl_grp_ffdhe_4096:
            return &ff_dhe_4096_params;
        case ssl_grp_ffdhe_6144:
            return &ff_dhe_6144_params;
        case ssl_grp_ffdhe_8192:
            return &ff_dhe_8192_params;
        case ssl_grp_ffdhe_custom:
            PORT_Assert(gWeakDHParams);
            return gWeakDHParams;
        default:
            PORT_Assert(0);
    }
    return NULL;
}

/* This validates dh_Ys against the group prime. */
PRBool
ssl_IsValidDHEShare(const SECItem *dh_p, const SECItem *dh_Ys)
{
    unsigned int size_p = SECKEY_BigIntegerBitLength(dh_p);
    unsigned int size_y = SECKEY_BigIntegerBitLength(dh_Ys);
    unsigned int commonPart;
    int cmp;

    if (dh_p->len == 0 || dh_Ys->len == 0) {
        return PR_FALSE;
    }
    /* Check that the prime is at least odd. */
    if ((dh_p->data[dh_p->len - 1] & 0x01) == 0) {
        return PR_FALSE;
    }
    /* dh_Ys can't be 1, or bigger than dh_p. */
    if (size_y <= 1 || size_y > size_p) {
        return PR_FALSE;
    }
    /* If dh_Ys is shorter, then it's definitely smaller than p-1. */
    if (size_y < size_p) {
        return PR_TRUE;
    }

    /* Compare the common part of each, minus the final octet. */
    commonPart = (size_p + 7) / 8;
    PORT_Assert(commonPart <= dh_Ys->len);
    PORT_Assert(commonPart <= dh_p->len);
    cmp = PORT_Memcmp(dh_Ys->data + dh_Ys->len - commonPart,
                      dh_p->data + dh_p->len - commonPart, commonPart - 1);
    if (cmp < 0) {
        return PR_TRUE;
    }
    if (cmp > 0) {
        return PR_FALSE;
    }

    /* The last octet of the prime is the only thing that is different and that
     * has to be two greater than the share, otherwise we have Ys == p - 1,
     * and that means small subgroups. */
    if (dh_Ys->data[dh_Ys->len - 1] >= (dh_p->data[dh_p->len - 1] - 1)) {
        return PR_FALSE;
    }

    return PR_TRUE;
}

/* Checks that the provided DH parameters match those in one of the named groups
 * that we have enabled.  The groups are defined in dhe-param.c and are those
 * defined in Appendix A of draft-ietf-tls-negotiated-ff-dhe.
 *
 * |groupDef| and |dhParams| are optional outparams that identify the group and
 * its parameters respectively (if this is successful). */
SECStatus
ssl_ValidateDHENamedGroup(sslSocket *ss,
                          const SECItem *dh_p,
                          const SECItem *dh_g,
                          const sslNamedGroupDef **groupDef,
                          const ssl3DHParams **dhParams)
{
    unsigned int i;

    for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
        const ssl3DHParams *params;
        if (!ss->namedGroupPreferences[i]) {
            continue;
        }
        if (ss->namedGroupPreferences[i]->keaType != ssl_kea_dh) {
            continue;
        }

        params = ssl_GetDHEParams(ss->namedGroupPreferences[i]);
        PORT_Assert(params);
        if (SECITEM_ItemsAreEqual(¶ms->prime, dh_p)) {
            if (!SECITEM_ItemsAreEqual(¶ms->base, dh_g)) {
                return SECFailure;
            }
            if (groupDef)
                *groupDef = ss->namedGroupPreferences[i];
            if (dhParams)
                *dhParams = params;
            return SECSuccess;
        }
    }

    return SECFailure;
}

/* Ensure DH parameters have been selected.  This just picks the first enabled
 * FFDHE group in ssl_named_groups, or the weak one if it was enabled. */
SECStatus
ssl_SelectDHEGroup(sslSocket *ss, const sslNamedGroupDef **groupDef)
{
    unsigned int i;
    static const sslNamedGroupDef weak_group_def = {
        ssl_grp_ffdhe_custom, WEAK_DHE_SIZE, ssl_kea_dh,
        SEC_OID_TLS_DHE_CUSTOM, PR_TRUE
    };
    PRInt32 minDH;
    SECStatus rv;

    // make sure we select a group consistent with our
    // current policy policy
    rv = NSS_OptionGet(NSS_DH_MIN_KEY_SIZE, &minDH);
    if (rv != SECSuccess || minDH <= 0) {
        minDH = DH_MIN_P_BITS;
    }

    /* Only select weak groups in TLS 1.2 and earlier, but not if the client has
     * indicated that it supports an FFDHE named group. */
    if (ss->ssl3.dheWeakGroupEnabled &&
        ss->version < SSL_LIBRARY_VERSION_TLS_1_3 &&
        !ss->xtnData.peerSupportsFfdheGroups &&
        weak_group_def.bits >= minDH) {
        *groupDef = &weak_group_def;
        return SECSuccess;
    }
    if (ss->ssl3.dhePreferredGroup &&
        ssl_NamedGroupEnabled(ss, ss->ssl3.dhePreferredGroup) &&
        ss->ssl3.dhePreferredGroup->bits >= minDH) {
        *groupDef = ss->ssl3.dhePreferredGroup;
        return SECSuccess;
    }
    for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
        if (ss->namedGroupPreferences[i] &&
            ss->namedGroupPreferences[i]->keaType == ssl_kea_dh &&
            ss->namedGroupPreferences[i]->bits >= minDH) {
            *groupDef = ss->namedGroupPreferences[i];
            return SECSuccess;
        }
    }

    *groupDef = NULL;
    PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
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