Certificate Transparency TLS extension patch for NSS

net/third_party/nss/patches/signedcertificatetimestamps.patch

+diff --git a/net/third_party/nss/ssl/ssl.h b/net/third_party/nss/ssl/ssl.h
+index 47468a0..f8503eb 100644
+--- a/net/third_party/nss/ssl/ssl.h
++++ b/net/third_party/nss/ssl/ssl.h
+@@ -166,6 +166,8 @@ SSL_IMPORT PRFileDesc *DTLS_ImportFD(PRFileDesc *model, PRFileDesc *fd);
+  */
+ #define SSL_CBC_RANDOM_IV 23
+ #define SSL_ENABLE_OCSP_STAPLING       24 /* Request OCSP stapling (client) */
++/* Request Signed Certificate Timestamps via TLS extension (client) */
++#define SSL_ENABLE_SIGNED_CERT_TIMESTAMPS 25
+ 
+ #ifdef SSL_DEPRECATED_FUNCTION 
+ /* Old deprecated function names */
+@@ -469,6 +471,24 @@ SSL_IMPORT CERTCertList *SSL_PeerCertificateChain(PRFileDesc *fd);
+  */
+ SSL_IMPORT const SECItemArray * SSL_PeerStapledOCSPResponses(PRFileDesc *fd);
+ 
++/* SSL_PeerSignedCertTimestamps returns the signed_certificate_timestamp
++ * extension data provided by the TLS server. The return value is a pointer
++ * to an internal SECItem that contains the returned response (as a serialized
++ * SignedCertificateTimestampList, see RFC 6962). The returned pointer is only
++ * valid until the callback function that calls SSL_PeerSignedCertTimestamps
++ * (e.g. the authenticate certificate hook, or the handshake callback) returns.
++ *
++ * If no Signed Certificate Timestamps were given by the server then the result
++ * will be empty. If there was an error, or if SSLv2 was negotiated, then the
++ * result will be NULL.
++ *
++ * You must set the SSL_ENABLE_SIGNED_CERT_TIMESTAMPS option to indicate support
++ * for Signed Certificate Timestamps to a server.
++ *
++ * libssl does not do any parsing or validation of the response itself.
++ */
++SSL_IMPORT const SECItem * SSL_PeerSignedCertTimestamps(PRFileDesc *fd);
++
+ /* SSL_SetStapledOCSPResponses stores an array of one or multiple OCSP responses
+  * in the fd's data, which may be sent as part of a server side cert_status
+  * handshake message. Parameter |responses| is for the server certificate of
+diff --git a/net/third_party/nss/ssl/ssl3con.c b/net/third_party/nss/ssl/ssl3con.c
+index 7b93a63..2ec8501 100644
+--- a/net/third_party/nss/ssl/ssl3con.c
++++ b/net/third_party/nss/ssl/ssl3con.c
+@@ -6612,10 +6612,22 @@ ssl3_HandleServerHello(sslSocket *ss, SSL3Opaque *b, PRUint32 length)
+     sid->u.ssl3.sessionIDLength = sidBytes.len;
+     PORT_Memcpy(sid->u.ssl3.sessionID, sidBytes.data, sidBytes.len);
+ 
++    /* Copy Signed Certificate Timestamps, if any. */
++    if (ss->xtnData.signedCertTimestamps.data) {
++       rv = SECITEM_CopyItem(NULL, &sid->u.ssl3.signedCertTimestamps,
++                             &ss->xtnData.signedCertTimestamps);
++       if (rv != SECSuccess)
++           goto loser;
++    }
++
+     ss->ssl3.hs.isResuming = PR_FALSE;
+     ss->ssl3.hs.ws         = wait_server_cert;
+ 
+ winner:
++    /* Clean up the temporary pointer to the handshake buffer. */
++    ss->xtnData.signedCertTimestamps.data = NULL;
++    ss->xtnData.signedCertTimestamps.len = 0;
++
+     /* If we will need a ChannelID key then we make the callback now. This
+      * allows the handshake to be restarted cleanly if the callback returns
+      * SECWouldBlock. */
+@@ -6641,6 +6653,9 @@ alert_loser:
+     (void)SSL3_SendAlert(ss, alert_fatal, desc);
+ 
+ loser:
++    /* Clean up the temporary pointer to the handshake buffer. */
++    ss->xtnData.signedCertTimestamps.data = NULL;
++    ss->xtnData.signedCertTimestamps.len = 0;
+     errCode = ssl_MapLowLevelError(errCode);
+     return SECFailure;
+ }
+diff --git a/net/third_party/nss/ssl/ssl3ext.c b/net/third_party/nss/ssl/ssl3ext.c
+index 0415770..068223d 100644
+--- a/net/third_party/nss/ssl/ssl3ext.c
++++ b/net/third_party/nss/ssl/ssl3ext.c
+@@ -81,6 +81,12 @@ static PRInt32 ssl3_ClientSendSigAlgsXtn(sslSocket *ss, PRBool append,
+                                          PRUint32 maxBytes);
+ static SECStatus ssl3_ServerHandleSigAlgsXtn(sslSocket *ss, PRUint16 ex_type,
+                                              SECItem *data);
++static PRInt32 ssl3_ClientSendSignedCertTimestampXtn(sslSocket *ss,
++                                                    PRBool append,
++                                                    PRUint32 maxBytes);
++static SECStatus ssl3_ClientHandleSignedCertTimestampXtn(sslSocket *ss,
++                                                        PRUint16 ex_type,
++                                                        SECItem *data);
+ 
+ /*
+  * Write bytes.  Using this function means the SECItem structure
+@@ -259,6 +265,8 @@ static const ssl3HelloExtensionHandler serverHelloHandlersTLS[] = {
+     { ssl_use_srtp_xtn,           &ssl3_HandleUseSRTPXtn },
+     { ssl_channel_id_xtn,         &ssl3_ClientHandleChannelIDXtn },
+     { ssl_cert_status_xtn,        &ssl3_ClientHandleStatusRequestXtn },
++    { ssl_signed_certificate_timestamp_xtn,
++      &ssl3_ClientHandleSignedCertTimestampXtn },
+     { -1, NULL }
+ };
+ 
+@@ -287,7 +295,9 @@ ssl3HelloExtensionSender clientHelloSendersTLS[SSL_MAX_EXTENSIONS] = {
+     { ssl_use_srtp_xtn,               &ssl3_SendUseSRTPXtn },
+     { ssl_channel_id_xtn,             &ssl3_ClientSendChannelIDXtn },
+     { ssl_cert_status_xtn,            &ssl3_ClientSendStatusRequestXtn },
+-    { ssl_signature_algorithms_xtn,   &ssl3_ClientSendSigAlgsXtn }
++    { ssl_signature_algorithms_xtn,   &ssl3_ClientSendSigAlgsXtn },
++    { ssl_signed_certificate_timestamp_xtn,
++      &ssl3_ClientSendSignedCertTimestampXtn }
+     /* any extra entries will appear as { 0, NULL }    */
+ };
+ 
+@@ -2297,3 +2307,60 @@ ssl3_ClientSendSigAlgsXtn(sslSocket * ss, PRBool append, PRUint32 maxBytes)
+ loser:
+     return -1;
+ }
++
++/* ssl3_ClientSendSignedCertTimestampXtn sends the signed_certificate_timestamp
++ * extension for TLS ClientHellos. */
++static PRInt32
++ssl3_ClientSendSignedCertTimestampXtn(sslSocket *ss, PRBool append,
++                                     PRUint32 maxBytes)
++{
++    PRInt32 extension_length = 2 /* extension_type */ +
++           2 /* length(extension_data) */;
++
++    /* Only send the extension if processing is enabled. */
++    if (!ss->opt.enableSignedCertTimestamps)
++       return 0;
++
++    if (append && maxBytes >= extension_length) {
++       SECStatus rv;
++       /* extension_type */
++       rv = ssl3_AppendHandshakeNumber(ss,
++                                       ssl_signed_certificate_timestamp_xtn,
++                                       2);
++       if (rv != SECSuccess)
++           goto loser;
++       /* zero length */
++       rv = ssl3_AppendHandshakeNumber(ss, 0, 2);
++       if (rv != SECSuccess)
++           goto loser;
++       ss->xtnData.advertised[ss->xtnData.numAdvertised++] =
++               ssl_signed_certificate_timestamp_xtn;
++    } else if (maxBytes < extension_length) {
++       PORT_Assert(0);
++       return 0;
++    }
++
++    return extension_length;
++loser:
++    return -1;
++}
++
++static SECStatus
++ssl3_ClientHandleSignedCertTimestampXtn(sslSocket *ss, PRUint16 ex_type,
++                                       SECItem *data)
++{
++    /* We do not yet know whether we'll be resuming a session or creating
++     * a new one, so we keep a pointer to the data in the TLSExtensionData
++     * structure. This pointer is only valid in the scope of
++     * ssl3_HandleServerHello, and, if not resuming a session, the data is
++     * copied once a new session structure has been set up.
++     * All parsing is currently left to the application and we accept
++     * everything, including empty data.
++     */
++    SECItem *scts = &ss->xtnData.signedCertTimestamps;
++    PORT_Assert(!scts->data && !scts->len);
++    *scts = *data;
++    /* Keep track of negotiated extensions. */
++    ss->xtnData.negotiated[ss->xtnData.numNegotiated++] = ex_type;
++    return SECSuccess;
++}
+diff --git a/net/third_party/nss/ssl/sslimpl.h b/net/third_party/nss/ssl/sslimpl.h
+index 614eed1..c30bcf2 100644
+--- a/net/third_party/nss/ssl/sslimpl.h
++++ b/net/third_party/nss/ssl/sslimpl.h
+@@ -305,29 +305,30 @@ typedef struct sslOptionsStr {
+      * list of supported protocols. */
+     SECItem nextProtoNego;
+ 
+-    unsigned int useSecurity           : 1;  /*  1 */
+-    unsigned int useSocks              : 1;  /*  2 */
+-    unsigned int requestCertificate    : 1;  /*  3 */
+-    unsigned int requireCertificate    : 2;  /*  4-5 */
+-    unsigned int handshakeAsClient     : 1;  /*  6 */
+-    unsigned int handshakeAsServer     : 1;  /*  7 */
+-    unsigned int enableSSL2            : 1;  /*  8 */
+-    unsigned int unusedBit9            : 1;  /*  9 */
+-    unsigned int unusedBit10           : 1;  /* 10 */
+-    unsigned int noCache               : 1;  /* 11 */
+-    unsigned int fdx                   : 1;  /* 12 */
+-    unsigned int v2CompatibleHello     : 1;  /* 13 */
+-    unsigned int detectRollBack        : 1;  /* 14 */
+-    unsigned int noStepDown             : 1;  /* 15 */
+-    unsigned int bypassPKCS11           : 1;  /* 16 */
+-    unsigned int noLocks                : 1;  /* 17 */
+-    unsigned int enableSessionTickets   : 1;  /* 18 */
+-    unsigned int enableDeflate          : 1;  /* 19 */
+-    unsigned int enableRenegotiation    : 2;  /* 20-21 */
+-    unsigned int requireSafeNegotiation : 1;  /* 22 */
+-    unsigned int enableFalseStart       : 1;  /* 23 */
+-    unsigned int cbcRandomIV            : 1;  /* 24 */
+-    unsigned int enableOCSPStapling     : 1;  /* 25 */
++    unsigned int useSecurity               : 1;  /*  1 */
++    unsigned int useSocks                  : 1;  /*  2 */
++    unsigned int requestCertificate        : 1;  /*  3 */
++    unsigned int requireCertificate        : 2;  /*  4-5 */
++    unsigned int handshakeAsClient         : 1;  /*  6 */
++    unsigned int handshakeAsServer         : 1;  /*  7 */
++    unsigned int enableSSL2                : 1;  /*  8 */
++    unsigned int unusedBit9                : 1;  /*  9 */
++    unsigned int unusedBit10               : 1;  /* 10 */
++    unsigned int noCache                   : 1;  /* 11 */
++    unsigned int fdx                       : 1;  /* 12 */
++    unsigned int v2CompatibleHello         : 1;  /* 13 */
++    unsigned int detectRollBack            : 1;  /* 14 */
++    unsigned int noStepDown                 : 1;  /* 15 */
++    unsigned int bypassPKCS11               : 1;  /* 16 */
++    unsigned int noLocks                    : 1;  /* 17 */
++    unsigned int enableSessionTickets       : 1;  /* 18 */
++    unsigned int enableDeflate              : 1;  /* 19 */
++    unsigned int enableRenegotiation        : 2;  /* 20-21 */
++    unsigned int requireSafeNegotiation     : 1;  /* 22 */
++    unsigned int enableFalseStart           : 1;  /* 23 */
++    unsigned int cbcRandomIV                : 1;  /* 24 */
++    unsigned int enableOCSPStapling        : 1;  /* 25 */
++    unsigned int enableSignedCertTimestamps : 1;  /* 26 */
+ } sslOptions;
+ 
+ typedef enum { sslHandshakingUndetermined = 0,
+@@ -698,6 +699,11 @@ struct sslSessionIDStr {
+             */
+            NewSessionTicket  sessionTicket;
+             SECItem           srvName;
++
++           /* Signed certificate timestamps received in a TLS extension.
++           ** (used only in client).
++           */
++           SECItem           signedCertTimestamps;
+        } ssl3;
+     } u;
+ };
+@@ -789,6 +795,18 @@ struct TLSExtensionDataStr {
+      * is beyond ssl3_HandleClientHello function. */
+     SECItem *sniNameArr;
+     PRUint32 sniNameArrSize;
++
++    /* Signed Certificate Timestamps extracted from the TLS extension.
++     * (client only).
++     * This container holds a temporary pointer to the extension data,
++     * until a session structure (the sec.ci.sid of an sslSocket) is setup
++     * that can hold a permanent copy of the data
++     * (in sec.ci.sid.u.ssl3.signedCertTimestamps).
++     * The data pointed to by this structure is neither explicitly allocated
++     * nor copied: the pointer points to the handshake message buffer and is
++     * only valid in the scope of ssl3_HandleServerHello.
++     */
++    SECItem signedCertTimestamps;
+ };
+ 
+ typedef SECStatus (*sslRestartTarget)(sslSocket *);
+diff --git a/net/third_party/nss/ssl/sslnonce.c b/net/third_party/nss/ssl/sslnonce.c
+index a6f7349..6d330f0 100644
+--- a/net/third_party/nss/ssl/sslnonce.c
++++ b/net/third_party/nss/ssl/sslnonce.c
+@@ -142,13 +142,19 @@ ssl_DestroySID(sslSessionID *sid)
+     if ( sid->localCert ) {
+        CERT_DestroyCertificate(sid->localCert);
+     }
+-    if (sid->u.ssl3.sessionTicket.ticket.data) {
+-       SECITEM_FreeItem(&sid->u.ssl3.sessionTicket.ticket, PR_FALSE);
+-    }
+-    if (sid->u.ssl3.srvName.data) {
+-       SECITEM_FreeItem(&sid->u.ssl3.srvName, PR_FALSE);
++
++    if (sid->version >= SSL_LIBRARY_VERSION_3_0) {
++       if (sid->u.ssl3.sessionTicket.ticket.data) {
++           SECITEM_FreeItem(&sid->u.ssl3.sessionTicket.ticket, PR_FALSE);
++       }
++       if (sid->u.ssl3.srvName.data) {
++           SECITEM_FreeItem(&sid->u.ssl3.srvName, PR_FALSE);
++       }
++       if (sid->u.ssl3.signedCertTimestamps.data) {
++           SECITEM_FreeItem(&sid->u.ssl3.signedCertTimestamps, PR_FALSE);
++       }
+     }
+-    
++
+     PORT_ZFree(sid, sizeof(sslSessionID));
+ }
+ 
+diff --git a/net/third_party/nss/ssl/sslsock.c b/net/third_party/nss/ssl/sslsock.c
+index 072fad5..70f072b 100644
+--- a/net/third_party/nss/ssl/sslsock.c
++++ b/net/third_party/nss/ssl/sslsock.c
+@@ -173,7 +173,8 @@ static sslOptions ssl_defaults = {
+     PR_FALSE,   /* requireSafeNegotiation */
+     PR_FALSE,   /* enableFalseStart   */
+     PR_TRUE,    /* cbcRandomIV        */
+-    PR_FALSE    /* enableOCSPStapling */
++    PR_FALSE,   /* enableOCSPStapling */
++    PR_FALSE    /* enableSignedCertTimestamps */
+ };
+ 
+ /*
+@@ -863,6 +864,10 @@ SSL_OptionSet(PRFileDesc *fd, PRInt32 which, PRBool on)
+        ss->opt.enableOCSPStapling = on;
+        break;
+ 
++      case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
++       ss->opt.enableSignedCertTimestamps = on;
++       break;
++
+       default:
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+        rv = SECFailure;
+@@ -933,6 +938,9 @@ SSL_OptionGet(PRFileDesc *fd, PRInt32 which, PRBool *pOn)
+     case SSL_ENABLE_FALSE_START:  on = ss->opt.enableFalseStart;   break;
+     case SSL_CBC_RANDOM_IV:       on = ss->opt.cbcRandomIV;        break;
+     case SSL_ENABLE_OCSP_STAPLING: on = ss->opt.enableOCSPStapling; break;
++    case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
++       on = ss->opt.enableSignedCertTimestamps;
++       break;
+ 
+     default:
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+@@ -994,6 +1002,9 @@ SSL_OptionGetDefault(PRInt32 which, PRBool *pOn)
+     case SSL_ENABLE_OCSP_STAPLING:
+        on = ssl_defaults.enableOCSPStapling;
+        break;
++    case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
++       on = ssl_defaults.enableSignedCertTimestamps;
++       break;
+ 
+     default:
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+@@ -1161,6 +1172,10 @@ SSL_OptionSetDefault(PRInt32 which, PRBool on)
+        ssl_defaults.enableOCSPStapling = on;
+        break;
+ 
++      case SSL_ENABLE_SIGNED_CERT_TIMESTAMPS:
++       ssl_defaults.enableSignedCertTimestamps = on;
++       break;
++
+       default:
+        PORT_SetError(SEC_ERROR_INVALID_ARGS);
+        return SECFailure;
+@@ -1991,6 +2006,29 @@ SSL_PeerStapledOCSPResponses(PRFileDesc *fd)
+     return &ss->sec.ci.sid->peerCertStatus;
+ }
+ 
++const SECItem *
++SSL_PeerSignedCertTimestamps(PRFileDesc *fd)
++{
++    sslSocket *ss = ssl_FindSocket(fd);
++
++    if (!ss) {
++       SSL_DBG(("%d: SSL[%d]: bad socket in SSL_PeerSignedCertTimestamps",
++               SSL_GETPID(), fd));
++       return NULL;
++    }
++
++    if (!ss->sec.ci.sid) {
++       PORT_SetError(SEC_ERROR_NOT_INITIALIZED);
++       return NULL;
++    }
++
++    if (ss->version < SSL_LIBRARY_VERSION_3_0) {
++       PORT_SetError(SSL_ERROR_FEATURE_NOT_SUPPORTED_FOR_SSL2);
++       return NULL;
++    }
++    return &ss->sec.ci.sid->u.ssl3.signedCertTimestamps;
++}
++
+ SECStatus
+ SSL_HandshakeResumedSession(PRFileDesc *fd, PRBool *handshake_resumed) {
+     sslSocket *ss = ssl_FindSocket(fd);
+@@ -3131,4 +3169,3 @@ loser:
+     }
+     return ss;
+ }
+-
+diff --git a/net/third_party/nss/ssl/sslt.h b/net/third_party/nss/ssl/sslt.h
+index a8007d8..2d98978 100644
+--- a/net/third_party/nss/ssl/sslt.h
++++ b/net/third_party/nss/ssl/sslt.h
+@@ -202,12 +202,13 @@ typedef enum {
+     ssl_signature_algorithms_xtn     = 13,
+     ssl_use_srtp_xtn                 = 14,
+     ssl_app_layer_protocol_xtn       = 16,
++    ssl_signed_certificate_timestamp_xtn = 18,   /* RFC 6962 */
+     ssl_session_ticket_xtn           = 35,
+     ssl_next_proto_nego_xtn          = 13172,
+     ssl_channel_id_xtn               = 30031,
+     ssl_renegotiation_info_xtn       = 0xff01  /* experimental number */
+ } SSLExtensionType;
+ 
+-#define SSL_MAX_EXTENSIONS             11
++#define SSL_MAX_EXTENSIONS             12
+ 
+ #endif /* __sslt_h_ */