Merge branch 'TLS-1.3'

1 files changed, 181 insertions, 0 deletions

diff --git a/security/nss/lib/ssl/tls13hashstate.c b/security/nss/lib/ssl/tls13hashstate.c
new file mode 100644
index 000000000..e3232f524
--- /dev/null
+++ b/security/nss/lib/ssl/tls13hashstate.c
@@ -0,0 +1,181 @@
+/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is PRIVATE to SSL.
+ *
+ * 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 "pk11func.h"
+#include "ssl.h"
+#include "sslt.h"
+#include "sslimpl.h"
+#include "selfencrypt.h"
+#include "tls13con.h"
+#include "tls13err.h"
+#include "tls13hashstate.h"
+
+/*
+ * The cookie is structured as a self-encrypted structure with the
+ * inner value being.
+ *
+ * struct {
+ *     uint8 indicator = 0xff;            // To disambiguate from tickets.
+ *     uint16 cipherSuite;                // Selected cipher suite.
+ *     uint16 keyShare;                   // Requested key share group (0=none)
+ *     opaque applicationToken<0..65535>; // Application token
+ *     opaque ch_hash[rest_of_buffer];    // H(ClientHello)
+ * } CookieInner;
+ */
+SECStatus
+tls13_MakeHrrCookie(sslSocket *ss, const sslNamedGroupDef *selectedGroup,
+                    const PRUint8 *appToken, unsigned int appTokenLen,
+                    PRUint8 *buf, unsigned int *len, unsigned int maxlen)
+{
+    SECStatus rv;
+    SSL3Hashes hashes;
+    PRUint8 cookie[1024];
+    sslBuffer cookieBuf = SSL_BUFFER(cookie);
+    static const PRUint8 indicator = 0xff;
+
+    /* Encode header. */
+    rv = sslBuffer_Append(&cookieBuf, &indicator, 1);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+    rv = sslBuffer_AppendNumber(&cookieBuf, ss->ssl3.hs.cipher_suite, 2);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+    rv = sslBuffer_AppendNumber(&cookieBuf,
+                                selectedGroup ? selectedGroup->name : 0, 2);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    /* Application token. */
+    rv = sslBuffer_AppendVariable(&cookieBuf, appToken, appTokenLen, 2);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    /* Compute and encode hashes. */
+    rv = tls13_ComputeHandshakeHashes(ss, &hashes);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+    rv = sslBuffer_Append(&cookieBuf, hashes.u.raw, hashes.len);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    /* Encrypt right into the buffer. */
+    rv = ssl_SelfEncryptProtect(ss, cookieBuf.buf, cookieBuf.len,
+                                buf, len, maxlen);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    return SECSuccess;
+}
+
+/* Recover the hash state from the cookie. */
+SECStatus
+tls13_RecoverHashState(sslSocket *ss,
+                       unsigned char *cookie, unsigned int cookieLen,
+                       ssl3CipherSuite *previousCipherSuite,
+                       const sslNamedGroupDef **previousGroup)
+{
+    SECStatus rv;
+    unsigned char plaintext[1024];
+    SECItem ptItem = { siBuffer, plaintext, 0 };
+    sslBuffer messageBuf = SSL_BUFFER_EMPTY;
+    PRUint32 sentinel;
+    PRUint32 cipherSuite;
+    PRUint32 group;
+    const sslNamedGroupDef *selectedGroup;
+    PRUint32 appTokenLen;
+    PRUint8 *appToken;
+
+    rv = ssl_SelfEncryptUnprotect(ss, cookie, cookieLen,
+                                  ptItem.data, &ptItem.len, sizeof(plaintext));
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    /* Should start with 0xff. */
+    rv = ssl3_ConsumeNumberFromItem(&ptItem, &sentinel, 1);
+    if ((rv != SECSuccess) || (sentinel != 0xff)) {
+        FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
+        return SECFailure;
+    }
+    /* The cipher suite should be the same or there are some shenanigans. */
+    rv = ssl3_ConsumeNumberFromItem(&ptItem, &cipherSuite, 2);
+    if (rv != SECSuccess) {
+        FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
+        return SECFailure;
+    }
+
+    /* The named group, if any. */
+    rv = ssl3_ConsumeNumberFromItem(&ptItem, &group, 2);
+    if (rv != SECSuccess) {
+        FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
+        return SECFailure;
+    }
+    selectedGroup = ssl_LookupNamedGroup(group);
+
+    /* Application token. */
+    PORT_Assert(ss->xtnData.applicationToken.len == 0);
+    rv = ssl3_ConsumeNumberFromItem(&ptItem, &appTokenLen, 2);
+    if (rv != SECSuccess) {
+        FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
+        return SECFailure;
+    }
+    if (SECITEM_AllocItem(NULL, &ss->xtnData.applicationToken,
+                          appTokenLen) == NULL) {
+        FATAL_ERROR(ss, PORT_GetError(), internal_error);
+        return SECFailure;
+    }
+    ss->xtnData.applicationToken.len = appTokenLen;
+    rv = ssl3_ConsumeFromItem(&ptItem, &appToken, appTokenLen);
+    if (rv != SECSuccess) {
+        FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
+        return SECFailure;
+    }
+    PORT_Memcpy(ss->xtnData.applicationToken.data, appToken, appTokenLen);
+
+    /* The remainder is the hash. */
+    if (ptItem.len != tls13_GetHashSize(ss)) {
+        FATAL_ERROR(ss, SSL_ERROR_RX_MALFORMED_CLIENT_HELLO, illegal_parameter);
+        return SECFailure;
+    }
+
+    /* Now reinject the message. */
+    SSL_ASSERT_HASHES_EMPTY(ss);
+    rv = ssl_HashHandshakeMessageInt(ss, ssl_hs_message_hash, 0,
+                                     ptItem.data, ptItem.len);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    /* And finally reinject the HRR. */
+    rv = tls13_ConstructHelloRetryRequest(ss, cipherSuite,
+                                          selectedGroup,
+                                          cookie, cookieLen,
+                                          &messageBuf);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    rv = ssl_HashHandshakeMessageInt(ss, ssl_hs_server_hello, 0,
+                                     SSL_BUFFER_BASE(&messageBuf),
+                                     SSL_BUFFER_LEN(&messageBuf));
+    sslBuffer_Clear(&messageBuf);
+    if (rv != SECSuccess) {
+        return SECFailure;
+    }
+
+    *previousCipherSuite = cipherSuite;
+    *previousGroup = selectedGroup;
+    return SECSuccess;
+}