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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /security/nss/lib/ssl/ssl3ecc.c
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'security/nss/lib/ssl/ssl3ecc.c')
-rw-r--r--security/nss/lib/ssl/ssl3ecc.c1009
1 files changed, 1009 insertions, 0 deletions
diff --git a/security/nss/lib/ssl/ssl3ecc.c b/security/nss/lib/ssl/ssl3ecc.c
new file mode 100644
index 000000000..9f2f4d621
--- /dev/null
+++ b/security/nss/lib/ssl/ssl3ecc.c
@@ -0,0 +1,1009 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * SSL3 Protocol
+ *
+ * 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/. */
+
+/* ECC code moved here from ssl3con.c */
+
+#include "cert.h"
+#include "ssl.h"
+#include "cryptohi.h" /* for DSAU_ stuff */
+#include "keyhi.h"
+#include "secder.h"
+#include "secitem.h"
+
+#include "sslimpl.h"
+#include "sslproto.h"
+#include "sslerr.h"
+#include "ssl3ext.h"
+#include "prtime.h"
+#include "prinrval.h"
+#include "prerror.h"
+#include "pratom.h"
+#include "prthread.h"
+#include "prinit.h"
+
+#include "pk11func.h"
+#include "secmod.h"
+
+#include <stdio.h>
+
+#ifndef PK11_SETATTRS
+#define PK11_SETATTRS(x, id, v, l) \
+ (x)->type = (id); \
+ (x)->pValue = (v); \
+ (x)->ulValueLen = (l);
+#endif
+
+SECStatus
+ssl_NamedGroup2ECParams(PLArenaPool *arena, const sslNamedGroupDef *ecGroup,
+ SECKEYECParams *params)
+{
+ SECOidData *oidData = NULL;
+
+ if (!params) {
+ PORT_Assert(0);
+ PORT_SetError(SEC_ERROR_INVALID_ARGS);
+ return SECFailure;
+ }
+
+ if (!ecGroup || ecGroup->keaType != ssl_kea_ecdh ||
+ (oidData = SECOID_FindOIDByTag(ecGroup->oidTag)) == NULL) {
+ PORT_SetError(SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE);
+ return SECFailure;
+ }
+
+ if (SECITEM_AllocItem(arena, params, (2 + oidData->oid.len)) == NULL) {
+ PORT_SetError(SEC_ERROR_NO_MEMORY);
+ return SECFailure;
+ }
+
+ /*
+ * params->data needs to contain the ASN encoding of an object ID (OID)
+ * representing the named curve. The actual OID is in
+ * oidData->oid.data so we simply prepend 0x06 and OID length
+ */
+ params->data[0] = SEC_ASN1_OBJECT_ID;
+ params->data[1] = oidData->oid.len;
+ memcpy(params->data + 2, oidData->oid.data, oidData->oid.len);
+
+ return SECSuccess;
+}
+
+const sslNamedGroupDef *
+ssl_ECPubKey2NamedGroup(const SECKEYPublicKey *pubKey)
+{
+ SECItem oid = { siBuffer, NULL, 0 };
+ SECOidData *oidData = NULL;
+ PRUint32 policyFlags = 0;
+ unsigned int i;
+ const SECKEYECParams *params;
+
+ if (pubKey->keyType != ecKey) {
+ PORT_Assert(0);
+ return NULL;
+ }
+
+ params = &pubKey->u.ec.DEREncodedParams;
+
+ /*
+ * params->data needs to contain the ASN encoding of an object ID (OID)
+ * representing a named curve. Here, we strip away everything
+ * before the actual OID and use the OID to look up a named curve.
+ */
+ if (params->data[0] != SEC_ASN1_OBJECT_ID)
+ return NULL;
+ oid.len = params->len - 2;
+ oid.data = params->data + 2;
+ if ((oidData = SECOID_FindOID(&oid)) == NULL)
+ return NULL;
+ if ((NSS_GetAlgorithmPolicy(oidData->offset, &policyFlags) ==
+ SECSuccess) &&
+ !(policyFlags & NSS_USE_ALG_IN_SSL_KX)) {
+ return NULL;
+ }
+ for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
+ if (ssl_named_groups[i].oidTag == oidData->offset) {
+ return &ssl_named_groups[i];
+ }
+ }
+
+ return NULL;
+}
+
+/* Caller must set hiLevel error code. */
+static SECStatus
+ssl3_ComputeECDHKeyHash(SSLHashType hashAlg,
+ SECItem ec_params, SECItem server_ecpoint,
+ SSL3Random *client_rand, SSL3Random *server_rand,
+ SSL3Hashes *hashes)
+{
+ PRUint8 *hashBuf;
+ PRUint8 *pBuf;
+ SECStatus rv = SECSuccess;
+ unsigned int bufLen;
+ /*
+ * We only support named curves (the appropriate checks are made before this
+ * method is called) so ec_params takes up only two bytes. ECPoint needs to
+ * fit in 256 bytes because the spec says the length must fit in one byte.
+ */
+ PRUint8 buf[2 * SSL3_RANDOM_LENGTH + 2 + 1 + 256];
+
+ bufLen = 2 * SSL3_RANDOM_LENGTH + ec_params.len + 1 + server_ecpoint.len;
+ if (bufLen <= sizeof buf) {
+ hashBuf = buf;
+ } else {
+ hashBuf = PORT_Alloc(bufLen);
+ if (!hashBuf) {
+ return SECFailure;
+ }
+ }
+
+ memcpy(hashBuf, client_rand, SSL3_RANDOM_LENGTH);
+ pBuf = hashBuf + SSL3_RANDOM_LENGTH;
+ memcpy(pBuf, server_rand, SSL3_RANDOM_LENGTH);
+ pBuf += SSL3_RANDOM_LENGTH;
+ memcpy(pBuf, ec_params.data, ec_params.len);
+ pBuf += ec_params.len;
+ pBuf[0] = (PRUint8)(server_ecpoint.len);
+ pBuf += 1;
+ memcpy(pBuf, server_ecpoint.data, server_ecpoint.len);
+ pBuf += server_ecpoint.len;
+ PORT_Assert((unsigned int)(pBuf - hashBuf) == bufLen);
+
+ rv = ssl3_ComputeCommonKeyHash(hashAlg, hashBuf, bufLen, hashes);
+
+ PRINT_BUF(95, (NULL, "ECDHkey hash: ", hashBuf, bufLen));
+ PRINT_BUF(95, (NULL, "ECDHkey hash: MD5 result",
+ hashes->u.s.md5, MD5_LENGTH));
+ PRINT_BUF(95, (NULL, "ECDHkey hash: SHA1 result",
+ hashes->u.s.sha, SHA1_LENGTH));
+
+ if (hashBuf != buf)
+ PORT_Free(hashBuf);
+ return rv;
+}
+
+/* Called from ssl3_SendClientKeyExchange(). */
+SECStatus
+ssl3_SendECDHClientKeyExchange(sslSocket *ss, SECKEYPublicKey *svrPubKey)
+{
+ PK11SymKey *pms = NULL;
+ SECStatus rv = SECFailure;
+ PRBool isTLS, isTLS12;
+ CK_MECHANISM_TYPE target;
+ const sslNamedGroupDef *groupDef;
+ sslEphemeralKeyPair *keyPair = NULL;
+ SECKEYPublicKey *pubKey;
+
+ PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
+ PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
+
+ isTLS = (PRBool)(ss->ssl3.pwSpec->version > SSL_LIBRARY_VERSION_3_0);
+ isTLS12 = (PRBool)(ss->ssl3.pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
+
+ /* Generate ephemeral EC keypair */
+ if (svrPubKey->keyType != ecKey) {
+ PORT_SetError(SEC_ERROR_BAD_KEY);
+ goto loser;
+ }
+ groupDef = ssl_ECPubKey2NamedGroup(svrPubKey);
+ if (!groupDef) {
+ PORT_SetError(SEC_ERROR_BAD_KEY);
+ goto loser;
+ }
+ ss->sec.keaGroup = groupDef;
+ rv = ssl_CreateECDHEphemeralKeyPair(ss, groupDef, &keyPair);
+ if (rv != SECSuccess) {
+ ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
+ goto loser;
+ }
+
+ pubKey = keyPair->keys->pubKey;
+ PRINT_BUF(50, (ss, "ECDH public value:",
+ pubKey->u.ec.publicValue.data,
+ pubKey->u.ec.publicValue.len));
+
+ if (isTLS12) {
+ target = CKM_TLS12_MASTER_KEY_DERIVE_DH;
+ } else if (isTLS) {
+ target = CKM_TLS_MASTER_KEY_DERIVE_DH;
+ } else {
+ target = CKM_SSL3_MASTER_KEY_DERIVE_DH;
+ }
+
+ /* Determine the PMS */
+ pms = PK11_PubDeriveWithKDF(keyPair->keys->privKey, svrPubKey,
+ PR_FALSE, NULL, NULL, CKM_ECDH1_DERIVE, target,
+ CKA_DERIVE, 0, CKD_NULL, NULL, NULL);
+
+ if (pms == NULL) {
+ (void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
+ ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
+ goto loser;
+ }
+
+ rv = ssl3_AppendHandshakeHeader(ss, client_key_exchange,
+ pubKey->u.ec.publicValue.len + 1);
+ if (rv != SECSuccess) {
+ goto loser; /* err set by ssl3_AppendHandshake* */
+ }
+
+ rv = ssl3_AppendHandshakeVariable(ss, pubKey->u.ec.publicValue.data,
+ pubKey->u.ec.publicValue.len, 1);
+
+ if (rv != SECSuccess) {
+ goto loser; /* err set by ssl3_AppendHandshake* */
+ }
+
+ rv = ssl3_InitPendingCipherSpec(ss, pms);
+ if (rv != SECSuccess) {
+ ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
+ goto loser;
+ }
+
+ PK11_FreeSymKey(pms);
+ ssl_FreeEphemeralKeyPair(keyPair);
+ return SECSuccess;
+
+loser:
+ if (pms)
+ PK11_FreeSymKey(pms);
+ if (keyPair)
+ ssl_FreeEphemeralKeyPair(keyPair);
+ return SECFailure;
+}
+
+/* This function returns the size of the key_exchange field in
+ * the KeyShareEntry structure, i.e.:
+ * opaque point <1..2^8-1>; */
+unsigned int
+tls13_SizeOfECDHEKeyShareKEX(const SECKEYPublicKey *pubKey)
+{
+ PORT_Assert(pubKey->keyType == ecKey);
+ return pubKey->u.ec.publicValue.len;
+}
+
+/* This function encodes the key_exchange field in
+ * the KeyShareEntry structure. */
+SECStatus
+tls13_EncodeECDHEKeyShareKEX(const sslSocket *ss, const SECKEYPublicKey *pubKey)
+{
+ PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
+ PORT_Assert(ss->opt.noLocks || ssl_HaveXmitBufLock(ss));
+ PORT_Assert(pubKey->keyType == ecKey);
+
+ return ssl3_ExtAppendHandshake(ss, pubKey->u.ec.publicValue.data,
+ pubKey->u.ec.publicValue.len);
+}
+
+/*
+** Called from ssl3_HandleClientKeyExchange()
+*/
+SECStatus
+ssl3_HandleECDHClientKeyExchange(sslSocket *ss, SSL3Opaque *b,
+ PRUint32 length,
+ sslKeyPair *serverKeyPair)
+{
+ PK11SymKey *pms;
+ SECStatus rv;
+ SECKEYPublicKey clntPubKey;
+ CK_MECHANISM_TYPE target;
+ PRBool isTLS, isTLS12;
+ int errCode = SSL_ERROR_RX_MALFORMED_CLIENT_KEY_EXCH;
+
+ PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
+ PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
+
+ clntPubKey.keyType = ecKey;
+ clntPubKey.u.ec.DEREncodedParams.len =
+ serverKeyPair->pubKey->u.ec.DEREncodedParams.len;
+ clntPubKey.u.ec.DEREncodedParams.data =
+ serverKeyPair->pubKey->u.ec.DEREncodedParams.data;
+ clntPubKey.u.ec.encoding = ECPoint_Undefined;
+
+ rv = ssl3_ConsumeHandshakeVariable(ss, &clntPubKey.u.ec.publicValue,
+ 1, &b, &length);
+ if (rv != SECSuccess) {
+ PORT_SetError(errCode);
+ return SECFailure;
+ }
+
+ /* we have to catch the case when the client's public key has length 0. */
+ if (!clntPubKey.u.ec.publicValue.len) {
+ (void)SSL3_SendAlert(ss, alert_fatal, illegal_parameter);
+ PORT_SetError(errCode);
+ return SECFailure;
+ }
+
+ isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
+ isTLS12 = (PRBool)(ss->ssl3.prSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
+
+ if (isTLS12) {
+ target = CKM_TLS12_MASTER_KEY_DERIVE_DH;
+ } else if (isTLS) {
+ target = CKM_TLS_MASTER_KEY_DERIVE_DH;
+ } else {
+ target = CKM_SSL3_MASTER_KEY_DERIVE_DH;
+ }
+
+ /* Determine the PMS */
+ pms = PK11_PubDeriveWithKDF(serverKeyPair->privKey, &clntPubKey,
+ PR_FALSE, NULL, NULL,
+ CKM_ECDH1_DERIVE, target, CKA_DERIVE, 0,
+ CKD_NULL, NULL, NULL);
+
+ if (pms == NULL) {
+ /* last gasp. */
+ errCode = ssl_MapLowLevelError(SSL_ERROR_CLIENT_KEY_EXCHANGE_FAILURE);
+ PORT_SetError(errCode);
+ return SECFailure;
+ }
+
+ rv = ssl3_InitPendingCipherSpec(ss, pms);
+ PK11_FreeSymKey(pms);
+ if (rv != SECSuccess) {
+ /* error code set by ssl3_InitPendingCipherSpec */
+ return SECFailure;
+ }
+ ss->sec.keaGroup = ssl_ECPubKey2NamedGroup(&clntPubKey);
+ return SECSuccess;
+}
+
+/*
+** Take an encoded key share and make a public key out of it.
+*/
+SECStatus
+ssl_ImportECDHKeyShare(sslSocket *ss, SECKEYPublicKey *peerKey,
+ SSL3Opaque *b, PRUint32 length,
+ const sslNamedGroupDef *ecGroup)
+{
+ SECStatus rv;
+ SECItem ecPoint = { siBuffer, NULL, 0 };
+
+ PORT_Assert(ss->opt.noLocks || ssl_HaveRecvBufLock(ss));
+ PORT_Assert(ss->opt.noLocks || ssl_HaveSSL3HandshakeLock(ss));
+
+ if (!length) {
+ PORT_SetError(SSL_ERROR_RX_MALFORMED_ECDHE_KEY_SHARE);
+ return SECFailure;
+ }
+
+ /* Fail if the ec point uses compressed representation */
+ if (b[0] != EC_POINT_FORM_UNCOMPRESSED &&
+ ecGroup->name != ssl_grp_ec_curve25519) {
+ PORT_SetError(SEC_ERROR_UNSUPPORTED_EC_POINT_FORM);
+ return SECFailure;
+ }
+
+ peerKey->keyType = ecKey;
+ /* Set up the encoded params */
+ rv = ssl_NamedGroup2ECParams(peerKey->arena, ecGroup,
+ &peerKey->u.ec.DEREncodedParams);
+ if (rv != SECSuccess) {
+ ssl_MapLowLevelError(SSL_ERROR_RX_MALFORMED_ECDHE_KEY_SHARE);
+ return SECFailure;
+ }
+ peerKey->u.ec.encoding = ECPoint_Undefined;
+
+ /* copy publicValue in peerKey */
+ ecPoint.data = b;
+ ecPoint.len = length;
+
+ rv = SECITEM_CopyItem(peerKey->arena, &peerKey->u.ec.publicValue, &ecPoint);
+ if (rv != SECSuccess) {
+ return SECFailure;
+ }
+
+ return SECSuccess;
+}
+
+const sslNamedGroupDef *
+ssl_GetECGroupWithStrength(sslSocket *ss, unsigned int requiredECCbits)
+{
+ int i;
+
+ PORT_Assert(ss);
+
+ for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
+ const sslNamedGroupDef *group = ss->namedGroupPreferences[i];
+ if (group && group->keaType == ssl_kea_ecdh &&
+ group->bits >= requiredECCbits) {
+ return group;
+ }
+ }
+
+ PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
+ return NULL;
+}
+
+/* Find the "weakest link". Get the strength of the signature and symmetric
+ * keys and choose a curve based on the weakest of those two. */
+const sslNamedGroupDef *
+ssl_GetECGroupForServerSocket(sslSocket *ss)
+{
+ const sslServerCert *cert = ss->sec.serverCert;
+ unsigned int certKeySize;
+ const ssl3BulkCipherDef *bulkCipher;
+ unsigned int requiredECCbits;
+
+ PORT_Assert(cert);
+ if (!cert || !cert->serverKeyPair || !cert->serverKeyPair->pubKey) {
+ PORT_SetError(SSL_ERROR_NO_CYPHER_OVERLAP);
+ return NULL;
+ }
+
+ if (cert->certType.authType == ssl_auth_rsa_sign) {
+ certKeySize = SECKEY_PublicKeyStrengthInBits(cert->serverKeyPair->pubKey);
+ certKeySize =
+ SSL_RSASTRENGTH_TO_ECSTRENGTH(certKeySize);
+ } else if (cert->certType.authType == ssl_auth_ecdsa ||
+ cert->certType.authType == ssl_auth_ecdh_rsa ||
+ cert->certType.authType == ssl_auth_ecdh_ecdsa) {
+ const sslNamedGroupDef *groupDef = cert->certType.namedCurve;
+
+ /* We won't select a certificate unless the named curve has been
+ * negotiated (or supported_curves was absent), double check that. */
+ PORT_Assert(groupDef->keaType == ssl_kea_ecdh);
+ PORT_Assert(ssl_NamedGroupEnabled(ss, groupDef));
+ if (!ssl_NamedGroupEnabled(ss, groupDef)) {
+ return NULL;
+ }
+ certKeySize = groupDef->bits;
+ } else {
+ PORT_Assert(0);
+ return NULL;
+ }
+ bulkCipher = ssl_GetBulkCipherDef(ss->ssl3.hs.suite_def);
+ requiredECCbits = bulkCipher->key_size * BPB * 2;
+ PORT_Assert(requiredECCbits ||
+ ss->ssl3.hs.suite_def->bulk_cipher_alg == cipher_null);
+ if (requiredECCbits > certKeySize) {
+ requiredECCbits = certKeySize;
+ }
+
+ return ssl_GetECGroupWithStrength(ss, requiredECCbits);
+}
+
+/* Create an ECDHE key pair for a given curve */
+SECStatus
+ssl_CreateECDHEphemeralKeyPair(const sslSocket *ss,
+ const sslNamedGroupDef *ecGroup,
+ sslEphemeralKeyPair **keyPair)
+{
+ SECKEYPrivateKey *privKey = NULL;
+ SECKEYPublicKey *pubKey = NULL;
+ SECKEYECParams ecParams = { siBuffer, NULL, 0 };
+ sslEphemeralKeyPair *pair;
+
+ if (ssl_NamedGroup2ECParams(NULL, ecGroup, &ecParams) != SECSuccess) {
+ return SECFailure;
+ }
+ privKey = SECKEY_CreateECPrivateKey(&ecParams, &pubKey, ss->pkcs11PinArg);
+ SECITEM_FreeItem(&ecParams, PR_FALSE);
+
+ if (!privKey || !pubKey ||
+ !(pair = ssl_NewEphemeralKeyPair(ecGroup, privKey, pubKey))) {
+ if (privKey) {
+ SECKEY_DestroyPrivateKey(privKey);
+ }
+ if (pubKey) {
+ SECKEY_DestroyPublicKey(pubKey);
+ }
+ ssl_MapLowLevelError(SEC_ERROR_KEYGEN_FAIL);
+ return SECFailure;
+ }
+
+ *keyPair = pair;
+ SSL_TRC(50, ("%d: SSL[%d]: Create ECDH ephemeral key %d",
+ SSL_GETPID(), ss ? ss->fd : NULL, ecGroup->name));
+ PRINT_BUF(50, (ss, "Public Key", pubKey->u.ec.publicValue.data,
+ pubKey->u.ec.publicValue.len));
+#ifdef TRACE
+ if (ssl_trace >= 50) {
+ SECItem d = { siBuffer, NULL, 0 };
+ SECStatus rv = PK11_ReadRawAttribute(PK11_TypePrivKey, privKey,
+ CKA_VALUE, &d);
+ if (rv == SECSuccess) {
+ PRINT_BUF(50, (ss, "Private Key", d.data, d.len));
+ SECITEM_FreeItem(&d, PR_FALSE);
+ } else {
+ SSL_TRC(50, ("Error extracting private key"));
+ }
+ }
+#endif
+ return SECSuccess;
+}
+
+SECStatus
+ssl3_HandleECDHServerKeyExchange(sslSocket *ss, SSL3Opaque *b, PRUint32 length)
+{
+ PLArenaPool *arena = NULL;
+ SECKEYPublicKey *peerKey = NULL;
+ PRBool isTLS;
+ SECStatus rv;
+ int errCode = SSL_ERROR_RX_MALFORMED_SERVER_KEY_EXCH;
+ SSL3AlertDescription desc = illegal_parameter;
+ SSL3Hashes hashes;
+ SECItem signature = { siBuffer, NULL, 0 };
+ SSLHashType hashAlg;
+ SSLSignatureScheme sigScheme;
+
+ SECItem ec_params = { siBuffer, NULL, 0 };
+ SECItem ec_point = { siBuffer, NULL, 0 };
+ unsigned char paramBuf[3];
+ const sslNamedGroupDef *ecGroup;
+
+ isTLS = (PRBool)(ss->ssl3.prSpec->version > SSL_LIBRARY_VERSION_3_0);
+
+ ec_params.len = sizeof paramBuf;
+ ec_params.data = paramBuf;
+ rv = ssl3_ConsumeHandshake(ss, ec_params.data, ec_params.len, &b, &length);
+ if (rv != SECSuccess) {
+ goto loser; /* malformed. */
+ }
+
+ /* Fail if the curve is not a named curve */
+ if (ec_params.data[0] != ec_type_named) {
+ errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
+ desc = handshake_failure;
+ goto alert_loser;
+ }
+ ecGroup = ssl_LookupNamedGroup(ec_params.data[1] << 8 | ec_params.data[2]);
+ if (!ecGroup || ecGroup->keaType != ssl_kea_ecdh) {
+ errCode = SEC_ERROR_UNSUPPORTED_ELLIPTIC_CURVE;
+ desc = handshake_failure;
+ goto alert_loser;
+ }
+
+ rv = ssl3_ConsumeHandshakeVariable(ss, &ec_point, 1, &b, &length);
+ if (rv != SECSuccess) {
+ goto loser; /* malformed. */
+ }
+
+ /* Fail if the provided point has length 0. */
+ if (!ec_point.len) {
+ /* desc and errCode are initialized already */
+ goto alert_loser;
+ }
+
+ /* Fail if the ec point is not uncompressed for any curve that's not 25519. */
+ if (ecGroup->name != ssl_grp_ec_curve25519 &&
+ ec_point.data[0] != EC_POINT_FORM_UNCOMPRESSED) {
+ errCode = SEC_ERROR_UNSUPPORTED_EC_POINT_FORM;
+ desc = handshake_failure;
+ goto alert_loser;
+ }
+
+ PORT_Assert(ss->ssl3.prSpec->version <= SSL_LIBRARY_VERSION_TLS_1_2);
+ if (ss->ssl3.prSpec->version == SSL_LIBRARY_VERSION_TLS_1_2) {
+ rv = ssl_ConsumeSignatureScheme(ss, &b, &length, &sigScheme);
+ if (rv != SECSuccess) {
+ goto loser; /* malformed or unsupported. */
+ }
+ rv = ssl_CheckSignatureSchemeConsistency(ss, sigScheme,
+ ss->sec.peerCert);
+ if (rv != SECSuccess) {
+ goto loser;
+ }
+ hashAlg = ssl_SignatureSchemeToHashType(sigScheme);
+ } else {
+ /* Use ssl_hash_none to represent the MD5+SHA1 combo. */
+ hashAlg = ssl_hash_none;
+ sigScheme = ssl_sig_none;
+ }
+
+ rv = ssl3_ConsumeHandshakeVariable(ss, &signature, 2, &b, &length);
+ if (rv != SECSuccess) {
+ goto loser; /* malformed. */
+ }
+
+ if (length != 0) {
+ if (isTLS)
+ desc = decode_error;
+ goto alert_loser; /* malformed. */
+ }
+
+ PRINT_BUF(60, (NULL, "Server EC params", ec_params.data, ec_params.len));
+ PRINT_BUF(60, (NULL, "Server EC point", ec_point.data, ec_point.len));
+
+ /* failures after this point are not malformed handshakes. */
+ /* TLS: send decrypt_error if signature failed. */
+ desc = isTLS ? decrypt_error : handshake_failure;
+
+ /*
+ * check to make sure the hash is signed by right guy
+ */
+ rv = ssl3_ComputeECDHKeyHash(hashAlg, ec_params, ec_point,
+ &ss->ssl3.hs.client_random,
+ &ss->ssl3.hs.server_random,
+ &hashes);
+
+ if (rv != SECSuccess) {
+ errCode =
+ ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
+ goto alert_loser;
+ }
+ rv = ssl3_VerifySignedHashes(ss, sigScheme, &hashes, &signature);
+ if (rv != SECSuccess) {
+ errCode =
+ ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
+ goto alert_loser;
+ }
+
+ arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
+ if (arena == NULL) {
+ errCode = SEC_ERROR_NO_MEMORY;
+ goto loser;
+ }
+
+ peerKey = PORT_ArenaZNew(arena, SECKEYPublicKey);
+ if (peerKey == NULL) {
+ errCode = SEC_ERROR_NO_MEMORY;
+ goto loser;
+ }
+ peerKey->arena = arena;
+
+ /* create public key from point data */
+ rv = ssl_ImportECDHKeyShare(ss, peerKey, ec_point.data, ec_point.len,
+ ecGroup);
+ if (rv != SECSuccess) {
+ /* error code is set */
+ desc = handshake_failure;
+ errCode = PORT_GetError();
+ goto alert_loser;
+ }
+ peerKey->pkcs11Slot = NULL;
+ peerKey->pkcs11ID = CK_INVALID_HANDLE;
+
+ ss->sec.peerKey = peerKey;
+ return SECSuccess;
+
+alert_loser:
+ (void)SSL3_SendAlert(ss, alert_fatal, desc);
+loser:
+ if (arena) {
+ PORT_FreeArena(arena, PR_FALSE);
+ }
+ PORT_SetError(errCode);
+ return SECFailure;
+}
+
+SECStatus
+ssl3_SendECDHServerKeyExchange(sslSocket *ss)
+{
+ SECStatus rv = SECFailure;
+ int length;
+ PRBool isTLS12;
+ SECItem signed_hash = { siBuffer, NULL, 0 };
+ SSLHashType hashAlg;
+ SSL3Hashes hashes;
+
+ SECItem ec_params = { siBuffer, NULL, 0 };
+ unsigned char paramBuf[3];
+ const sslNamedGroupDef *ecGroup;
+ sslEphemeralKeyPair *keyPair;
+ SECKEYPublicKey *pubKey;
+
+ /* Generate ephemeral ECDH key pair and send the public key */
+ ecGroup = ssl_GetECGroupForServerSocket(ss);
+ if (!ecGroup) {
+ goto loser;
+ }
+
+ PORT_Assert(PR_CLIST_IS_EMPTY(&ss->ephemeralKeyPairs));
+ if (ss->opt.reuseServerECDHEKey) {
+ rv = ssl_CreateStaticECDHEKey(ss, ecGroup);
+ if (rv != SECSuccess) {
+ goto loser;
+ }
+ keyPair = (sslEphemeralKeyPair *)PR_NEXT_LINK(&ss->ephemeralKeyPairs);
+ } else {
+ rv = ssl_CreateECDHEphemeralKeyPair(ss, ecGroup, &keyPair);
+ if (rv != SECSuccess) {
+ goto loser;
+ }
+ PR_APPEND_LINK(&keyPair->link, &ss->ephemeralKeyPairs);
+ }
+
+ PORT_Assert(keyPair);
+ if (!keyPair) {
+ PORT_SetError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
+ return SECFailure;
+ }
+
+ ec_params.len = sizeof(paramBuf);
+ ec_params.data = paramBuf;
+ PORT_Assert(keyPair->group);
+ PORT_Assert(keyPair->group->keaType == ssl_kea_ecdh);
+ ec_params.data[0] = ec_type_named;
+ ec_params.data[1] = keyPair->group->name >> 8;
+ ec_params.data[2] = keyPair->group->name & 0xff;
+
+ pubKey = keyPair->keys->pubKey;
+ if (ss->ssl3.pwSpec->version == SSL_LIBRARY_VERSION_TLS_1_2) {
+ hashAlg = ssl_SignatureSchemeToHashType(ss->ssl3.hs.signatureScheme);
+ } else {
+ /* Use ssl_hash_none to represent the MD5+SHA1 combo. */
+ hashAlg = ssl_hash_none;
+ }
+ rv = ssl3_ComputeECDHKeyHash(hashAlg, ec_params,
+ pubKey->u.ec.publicValue,
+ &ss->ssl3.hs.client_random,
+ &ss->ssl3.hs.server_random,
+ &hashes);
+ if (rv != SECSuccess) {
+ ssl_MapLowLevelError(SSL_ERROR_SERVER_KEY_EXCHANGE_FAILURE);
+ goto loser;
+ }
+
+ isTLS12 = (PRBool)(ss->ssl3.pwSpec->version >= SSL_LIBRARY_VERSION_TLS_1_2);
+
+ rv = ssl3_SignHashes(ss, &hashes,
+ ss->sec.serverCert->serverKeyPair->privKey, &signed_hash);
+ if (rv != SECSuccess) {
+ goto loser; /* ssl3_SignHashes has set err. */
+ }
+
+ length = ec_params.len +
+ 1 + pubKey->u.ec.publicValue.len +
+ (isTLS12 ? 2 : 0) + 2 + signed_hash.len;
+
+ rv = ssl3_AppendHandshakeHeader(ss, server_key_exchange, length);
+ if (rv != SECSuccess) {
+ goto loser; /* err set by AppendHandshake. */
+ }
+
+ rv = ssl3_AppendHandshake(ss, ec_params.data, ec_params.len);
+ if (rv != SECSuccess) {
+ goto loser; /* err set by AppendHandshake. */
+ }
+
+ rv = ssl3_AppendHandshakeVariable(ss, pubKey->u.ec.publicValue.data,
+ pubKey->u.ec.publicValue.len, 1);
+ if (rv != SECSuccess) {
+ goto loser; /* err set by AppendHandshake. */
+ }
+
+ if (isTLS12) {
+ rv = ssl3_AppendHandshakeNumber(ss, ss->ssl3.hs.signatureScheme, 2);
+ if (rv != SECSuccess) {
+ goto loser; /* err set by AppendHandshake. */
+ }
+ }
+
+ rv = ssl3_AppendHandshakeVariable(ss, signed_hash.data,
+ signed_hash.len, 2);
+ if (rv != SECSuccess) {
+ goto loser; /* err set by AppendHandshake. */
+ }
+
+ PORT_Free(signed_hash.data);
+ return SECSuccess;
+
+loser:
+ if (signed_hash.data != NULL)
+ PORT_Free(signed_hash.data);
+ return SECFailure;
+}
+
+/* List of all ECC cipher suites */
+static const ssl3CipherSuite ssl_all_ec_suites[] = {
+ TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA,
+ TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
+ TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
+ TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
+ TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
+ TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
+ TLS_ECDHE_ECDSA_WITH_NULL_SHA,
+ TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
+ TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384,
+ TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
+ TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
+ TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
+ TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
+ TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
+ TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
+ TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
+ TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
+ TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+ TLS_ECDHE_RSA_WITH_NULL_SHA,
+ TLS_ECDHE_RSA_WITH_RC4_128_SHA,
+ TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA,
+ TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA,
+ TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA,
+ TLS_ECDH_ECDSA_WITH_NULL_SHA,
+ TLS_ECDH_ECDSA_WITH_RC4_128_SHA,
+ TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA,
+ TLS_ECDH_RSA_WITH_AES_128_CBC_SHA,
+ TLS_ECDH_RSA_WITH_AES_256_CBC_SHA,
+ TLS_ECDH_RSA_WITH_NULL_SHA,
+ TLS_ECDH_RSA_WITH_RC4_128_SHA,
+ 0 /* end of list marker */
+};
+
+static const ssl3CipherSuite ssl_dhe_suites[] = {
+ TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
+ TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
+ TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
+ TLS_DHE_DSS_WITH_AES_128_GCM_SHA256,
+ TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
+ TLS_DHE_DSS_WITH_AES_128_CBC_SHA,
+ TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
+ TLS_DHE_DSS_WITH_AES_128_CBC_SHA256,
+ TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA,
+ TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA,
+ TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
+ TLS_DHE_DSS_WITH_AES_256_CBC_SHA,
+ TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
+ TLS_DHE_DSS_WITH_AES_256_CBC_SHA256,
+ TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA,
+ TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA,
+ TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA,
+ TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA,
+ TLS_DHE_DSS_WITH_RC4_128_SHA,
+ TLS_DHE_RSA_WITH_DES_CBC_SHA,
+ TLS_DHE_DSS_WITH_DES_CBC_SHA,
+ 0
+};
+
+/* Order(N^2). Yuk. */
+static PRBool
+ssl_IsSuiteEnabled(const sslSocket *ss, const ssl3CipherSuite *list)
+{
+ const ssl3CipherSuite *suite;
+
+ for (suite = list; *suite; ++suite) {
+ PRBool enabled = PR_FALSE;
+ SECStatus rv = ssl3_CipherPrefGet(ss, *suite, &enabled);
+
+ PORT_Assert(rv == SECSuccess); /* else is coding error */
+ if (rv == SECSuccess && enabled)
+ return PR_TRUE;
+ }
+ return PR_FALSE;
+}
+
+/* Ask: is ANY ECC cipher suite enabled on this socket? */
+PRBool
+ssl_IsECCEnabled(const sslSocket *ss)
+{
+ PK11SlotInfo *slot;
+
+ /* make sure we can do ECC */
+ slot = PK11_GetBestSlot(CKM_ECDH1_DERIVE, ss->pkcs11PinArg);
+ if (!slot) {
+ return PR_FALSE;
+ }
+ PK11_FreeSlot(slot);
+
+ /* make sure an ECC cipher is enabled */
+ return ssl_IsSuiteEnabled(ss, ssl_all_ec_suites);
+}
+
+PRBool
+ssl_IsDHEEnabled(const sslSocket *ss)
+{
+ return ssl_IsSuiteEnabled(ss, ssl_dhe_suites);
+}
+
+/* Send our Supported Groups extension. */
+PRInt32
+ssl_SendSupportedGroupsXtn(const sslSocket *ss,
+ TLSExtensionData *xtnData,
+ PRBool append, PRUint32 maxBytes)
+{
+ PRInt32 extension_length;
+ unsigned char enabledGroups[64];
+ unsigned int enabledGroupsLen = 0;
+ unsigned int i;
+ PRBool ec;
+ PRBool ff = PR_FALSE;
+
+ if (!ss)
+ return 0;
+
+ /* We only send FF supported groups if we require DH named groups
+ * or if TLS 1.3 is a possibility. */
+ if (ss->vrange.max < SSL_LIBRARY_VERSION_TLS_1_3) {
+ ec = ssl_IsECCEnabled(ss);
+ if (ss->opt.requireDHENamedGroups) {
+ ff = ssl_IsDHEEnabled(ss);
+ }
+ if (!ec && !ff)
+ return 0;
+ } else {
+ ec = ff = PR_TRUE;
+ }
+
+ PORT_Assert(sizeof(enabledGroups) > SSL_NAMED_GROUP_COUNT * 2);
+ for (i = 0; i < SSL_NAMED_GROUP_COUNT; ++i) {
+ const sslNamedGroupDef *group = ss->namedGroupPreferences[i];
+ if (!group) {
+ continue;
+ }
+ if (group->keaType == ssl_kea_ecdh && !ec) {
+ continue;
+ }
+ if (group->keaType == ssl_kea_dh && !ff) {
+ continue;
+ }
+
+ if (append) {
+ (void)ssl_EncodeUintX(group->name, 2, &enabledGroups[enabledGroupsLen]);
+ }
+ enabledGroupsLen += 2;
+ }
+
+ if (enabledGroupsLen == 0) {
+ return 0;
+ }
+
+ extension_length =
+ 2 /* extension type */ +
+ 2 /* extension length */ +
+ 2 /* enabled groups length */ +
+ enabledGroupsLen;
+
+ if (maxBytes < (PRUint32)extension_length) {
+ return 0;
+ }
+
+ if (append) {
+ SECStatus rv;
+ rv = ssl3_ExtAppendHandshakeNumber(ss, ssl_supported_groups_xtn, 2);
+ if (rv != SECSuccess)
+ return -1;
+ rv = ssl3_ExtAppendHandshakeNumber(ss, extension_length - 4, 2);
+ if (rv != SECSuccess)
+ return -1;
+ rv = ssl3_ExtAppendHandshakeVariable(ss, enabledGroups,
+ enabledGroupsLen, 2);
+ if (rv != SECSuccess)
+ return -1;
+ if (!ss->sec.isServer) {
+ xtnData->advertised[xtnData->numAdvertised++] =
+ ssl_supported_groups_xtn;
+ }
+ }
+ return extension_length;
+}
+
+/* Send our "canned" (precompiled) Supported Point Formats extension,
+ * which says that we only support uncompressed points.
+ */
+PRInt32
+ssl3_SendSupportedPointFormatsXtn(
+ const sslSocket *ss,
+ TLSExtensionData *xtnData,
+ PRBool append,
+ PRUint32 maxBytes)
+{
+ static const PRUint8 ecPtFmt[6] = {
+ 0, 11, /* Extension type */
+ 0, 2, /* octets that follow */
+ 1, /* octets that follow */
+ 0 /* uncompressed type only */
+ };
+
+ /* No point in doing this unless we have a socket that supports ECC.
+ * Similarly, no point if we are going to do TLS 1.3 only or we have already
+ * picked TLS 1.3 (server) given that it doesn't use point formats. */
+ if (!ss || !ssl_IsECCEnabled(ss) ||
+ ss->vrange.min >= SSL_LIBRARY_VERSION_TLS_1_3 ||
+ (ss->sec.isServer && ss->version >= SSL_LIBRARY_VERSION_TLS_1_3))
+ return 0;
+ if (append && maxBytes >= (sizeof ecPtFmt)) {
+ SECStatus rv = ssl3_ExtAppendHandshake(ss, ecPtFmt, (sizeof ecPtFmt));
+ if (rv != SECSuccess)
+ return -1;
+ if (!ss->sec.isServer) {
+ xtnData->advertised[xtnData->numAdvertised++] =
+ ssl_ec_point_formats_xtn;
+ }
+ }
+ return sizeof(ecPtFmt);
+}