nss: fix TLS 1.3 for non-gecko users
this fixes e.g. pidgin failing to connect to googletalk accounts
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2 changed files with 138 additions and 1 deletions
137
srcpkgs/nss/patches/fix-bug1672703.patch
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137
srcpkgs/nss/patches/fix-bug1672703.patch
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commit b03a4fc5b902498414b02640dcb2717dfef9682f
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Author: Daiki Ueno <dueno@redhat.com>
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Date: Mon Oct 26 06:46:11 2020 +0100
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Bug 1672703, always tolerate the first CCS in TLS 1.3, r=mt
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Summary:
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This flips the meaning of the flag for checking excessive CCS
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messages, so it only rejects multiple CCS messages while the first CCS
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message is always accepted.
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Reviewers: mt
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Reviewed By: mt
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Bug #: 1672703
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Differential Revision: https://phabricator.services.mozilla.com/D94603
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---
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gtests/ssl_gtest/ssl_tls13compat_unittest.cc | 18 +++++++++---------
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lib/ssl/ssl3con.c | 20 +++++++-------------
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lib/ssl/sslimpl.h | 5 +----
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3 files changed, 17 insertions(+), 26 deletions(-)
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diff --git gtests/ssl_gtest/ssl_tls13compat_unittest.cc gtests/ssl_gtest/ssl_tls13compat_unittest.cc
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index dcede798cc..645f84ff02 100644
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--- nss/gtests/ssl_gtest/ssl_tls13compat_unittest.cc
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+++ nss/gtests/ssl_gtest/ssl_tls13compat_unittest.cc
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@@ -348,8 +348,8 @@ TEST_F(TlsConnectStreamTls13, ChangeCipherSpecBeforeClientHelloTwice) {
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client_->CheckErrorCode(SSL_ERROR_HANDSHAKE_UNEXPECTED_ALERT);
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}
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-// The server rejects a ChangeCipherSpec if the client advertises an
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-// empty session ID.
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+// The server accepts a ChangeCipherSpec even if the client advertises
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+// an empty session ID.
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TEST_F(TlsConnectStreamTls13, ChangeCipherSpecAfterClientHelloEmptySid) {
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EnsureTlsSetup();
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ConfigureVersion(SSL_LIBRARY_VERSION_TLS_1_3);
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@@ -358,9 +358,8 @@ TEST_F(TlsConnectStreamTls13, ChangeCipherSpecAfterClientHelloEmptySid) {
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client_->Handshake(); // Send ClientHello
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client_->SendDirect(DataBuffer(kCannedCcs, sizeof(kCannedCcs))); // Send CCS
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- server_->ExpectSendAlert(kTlsAlertUnexpectedMessage);
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- server_->Handshake(); // Consume ClientHello and CCS
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- server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
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+ Handshake();
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+ CheckConnected();
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}
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// The server rejects multiple ChangeCipherSpec even if the client
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@@ -381,7 +380,7 @@ TEST_F(Tls13CompatTest, ChangeCipherSpecAfterClientHelloTwice) {
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server_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
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}
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-// The client rejects a ChangeCipherSpec if it advertises an empty
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+// The client accepts a ChangeCipherSpec even if it advertises an empty
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// session ID.
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TEST_F(TlsConnectStreamTls13, ChangeCipherSpecAfterServerHelloEmptySid) {
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EnsureTlsSetup();
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@@ -398,9 +397,10 @@ TEST_F(TlsConnectStreamTls13, ChangeCipherSpecAfterServerHelloEmptySid) {
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// send ServerHello..CertificateVerify
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// Send CCS
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server_->SendDirect(DataBuffer(kCannedCcs, sizeof(kCannedCcs)));
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- client_->ExpectSendAlert(kTlsAlertUnexpectedMessage);
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- client_->Handshake(); // Consume ClientHello and CCS
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- client_->CheckErrorCode(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
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+
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+ // No alert is sent from the client. As Finished is dropped, we
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+ // can't use Handshake() and CheckConnected().
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+ client_->Handshake();
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}
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// The client rejects multiple ChangeCipherSpec in a row even if the
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diff --git lib/ssl/ssl3con.c lib/ssl/ssl3con.c
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index 767ffc30f1..b652dcea34 100644
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--- nss/lib/ssl/ssl3con.c
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+++ nss/lib/ssl/ssl3con.c
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@@ -6645,11 +6645,7 @@ ssl_CheckServerSessionIdCorrectness(sslSocket *ss, SECItem *sidBytes)
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/* TLS 1.3: We sent a session ID. The server's should match. */
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if (!IS_DTLS(ss) && (sentRealSid || sentFakeSid)) {
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- if (sidMatch) {
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- ss->ssl3.hs.allowCcs = PR_TRUE;
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- return PR_TRUE;
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- }
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- return PR_FALSE;
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+ return sidMatch;
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}
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/* TLS 1.3 (no SID)/DTLS 1.3: The server shouldn't send a session ID. */
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@@ -8696,7 +8692,6 @@ ssl3_HandleClientHello(sslSocket *ss, PRUint8 *b, PRUint32 length)
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errCode = PORT_GetError();
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goto alert_loser;
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}
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- ss->ssl3.hs.allowCcs = PR_TRUE;
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}
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/* TLS 1.3 requires that compression include only null. */
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@@ -13066,15 +13061,14 @@ ssl3_HandleRecord(sslSocket *ss, SSL3Ciphertext *cText)
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ss->ssl3.hs.ws != idle_handshake &&
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cText->buf->len == 1 &&
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cText->buf->buf[0] == change_cipher_spec_choice) {
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- if (ss->ssl3.hs.allowCcs) {
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- /* Ignore the first CCS. */
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- ss->ssl3.hs.allowCcs = PR_FALSE;
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+ if (!ss->ssl3.hs.rejectCcs) {
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+ /* Allow only the first CCS. */
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+ ss->ssl3.hs.rejectCcs = PR_TRUE;
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return SECSuccess;
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+ } else {
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+ alert = unexpected_message;
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+ PORT_SetError(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
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}
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-
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- /* Compatibility mode is not negotiated. */
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- alert = unexpected_message;
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- PORT_SetError(SSL_ERROR_RX_MALFORMED_CHANGE_CIPHER);
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}
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if ((IS_DTLS(ss) && !dtls13_AeadLimitReached(spec)) ||
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diff --git lib/ssl/sslimpl.h lib/ssl/sslimpl.h
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index 44c43a0e6c..35d0c2d6bc 100644
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--- nss/lib/ssl/sslimpl.h
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+++ nss/lib/ssl/sslimpl.h
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@@ -710,10 +710,7 @@ typedef struct SSL3HandshakeStateStr {
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* or received. */
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PRBool receivedCcs; /* A server received ChangeCipherSpec
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* before the handshake started. */
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- PRBool allowCcs; /* A server allows ChangeCipherSpec
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- * as the middlebox compatibility mode
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- * is explicitly indicarted by
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- * legacy_session_id in TLS 1.3 ClientHello. */
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+ PRBool rejectCcs; /* Excessive ChangeCipherSpecs are rejected. */
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PRBool clientCertRequested; /* True if CertificateRequest received. */
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PRBool endOfFlight; /* Processed a full flight (DTLS 1.3). */
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ssl3KEADef kea_def_mutable; /* Used to hold the writable kea_def
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@ -4,7 +4,7 @@ _nsprver=4.29
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pkgname=nss
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version=3.58
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revision=1
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revision=2
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hostmakedepends="perl"
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makedepends="nspr-devel sqlite-devel zlib-devel"
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depends="nspr>=${_nsprver}"
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