diff options
Diffstat (limited to 'security/nss/lib/ssl/ssl.h')
| -rw-r--r-- | security/nss/lib/ssl/ssl.h | 81 |
1 files changed, 53 insertions, 28 deletions
diff --git a/security/nss/lib/ssl/ssl.h b/security/nss/lib/ssl/ssl.h index 25aabbaa21..ecc4f95066 100644 --- a/security/nss/lib/ssl/ssl.h +++ b/security/nss/lib/ssl/ssl.h @@ -158,23 +158,18 @@ 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) */ -/* SSL_ENABLE_NPN controls whether the NPN extension is enabled for the initial - * handshake when application layer protocol negotiation is used. - * SSL_SetNextProtoCallback or SSL_SetNextProtoNego must be used to control the - * application layer protocol negotiation; otherwise, the NPN extension will - * not be negotiated. SSL_ENABLE_NPN is currently enabled by default but this - * may change in future versions. - */ +/* SSL_ENABLE_NPN is defunct and defaults to false. + * Using this option will not have any effect but won't produce an error. */ #define SSL_ENABLE_NPN 25 /* SSL_ENABLE_ALPN controls whether the ALPN extension is enabled for the * initial handshake when application layer protocol negotiation is used. - * SSL_SetNextProtoNego (not SSL_SetNextProtoCallback) must be used to control - * the application layer protocol negotiation; otherwise, the ALPN extension - * will not be negotiated. ALPN is not negotiated for renegotiation handshakes, - * even though the ALPN specification defines a way to use ALPN during - * renegotiations. SSL_ENABLE_ALPN is currently disabled by default, but this - * may change in future versions. + * SSL_SetNextProtoNego or SSL_SetNextProtoCallback can be used to control + * the application layer protocol negotiation; + * ALPN is not negotiated for renegotiation handshakes, even though the ALPN + * specification defines a way to use ALPN during renegotiations. + * SSL_ENABLE_ALPN is currently enabled by default, but this may change in + * future versions. */ #define SSL_ENABLE_ALPN 26 @@ -248,12 +243,45 @@ SSL_IMPORT PRFileDesc *DTLS_ImportFD(PRFileDesc *model, PRFileDesc *fd); */ #define SSL_ENABLE_0RTT_DATA 33 +/* Sets a limit to the size of encrypted records (see + * draft-ietf-tls-record-limit). This is the value that is advertised to peers, + * not a limit on the size of records that will be created. Setting this value + * reduces the size of records that will be received (not sent). + * + * This limit applies to the plaintext, but the records that appear on the wire + * will be bigger. This doesn't include record headers, IVs, block cipher + * padding, and authentication tags or MACs. + * + * NSS always advertises the record size limit extension. If this option is not + * set, the extension will contain the maximum allowed size for the selected TLS + * version (currently this is 16384 or 2^14 for TLS 1.2 and lower and 16385 for + * TLS 1.3). + * + * By default, NSS creates records that are the maximum size possible, using all + * the data that was written by the application. Writes larger than the maximum + * are split into maximum sized records, and any remainder (unless + * SSL_CBC_RANDOM_IV is enabled and active). If a peer advertises a record size + * limit then that value is used instead. + */ +#define SSL_RECORD_SIZE_LIMIT 34 + /* Enables TLS 1.3 compatibility mode. In this mode, the client includes a fake * session ID in the handshake and sends a ChangeCipherSpec. A server will * always use the setting chosen by the client, so the value of this option has * no effect for a server. This setting is ignored for DTLS. */ #define SSL_ENABLE_TLS13_COMPAT_MODE 35 +/* Enables the sending of DTLS records using the short (two octet) record + * header. Only do this if there are 2^10 or fewer packets in flight at a time; + * using this with a larger number of packets in flight could mean that packets + * are dropped if there is reordering. + * + * This applies to TLS 1.3 only. This is not a parameter that is negotiated + * during the TLS handshake. Unlike other socket options, this option can be + * changed after a handshake is complete. + */ +#define SSL_ENABLE_DTLS_SHORT_HEADER 36 + #ifdef SSL_DEPRECATED_FUNCTION /* Old deprecated function names */ SSL_IMPORT SECStatus SSL_Enable(PRFileDesc *fd, int option, PRIntn on); @@ -272,10 +300,10 @@ SSL_IMPORT SECStatus SSL_OptionSetDefault(PRInt32 option, PRIntn val); SSL_IMPORT SECStatus SSL_OptionGetDefault(PRInt32 option, PRIntn *val); SSL_IMPORT SECStatus SSL_CertDBHandleSet(PRFileDesc *fd, CERTCertDBHandle *dbHandle); -/* SSLNextProtoCallback is called during the handshake for the client, when a - * Next Protocol Negotiation (NPN) extension has been received from the server. - * |protos| and |protosLen| define a buffer which contains the server's - * advertisement. This data is guaranteed to be well formed per the NPN spec. +/* SSLNextProtoCallback is called during the handshake for the server, when an + * Application-Layer Protocol Negotiation (ALPN) extension has been received + * from the client. |protos| and |protosLen| define a buffer which contains the + * client's advertisement. * |protoOut| is a buffer provided by the caller, of length 255 (the maximum * allowed by the protocol). On successful return, the protocol to be announced * to the server will be in |protoOut| and its length in |*protoOutLen|. @@ -291,27 +319,24 @@ typedef SECStatus(PR_CALLBACK *SSLNextProtoCallback)( unsigned int *protoOutLen, unsigned int protoMaxOut); -/* SSL_SetNextProtoCallback sets a callback function to handle Next Protocol - * Negotiation. It causes a client to advertise NPN. */ +/* SSL_SetNextProtoCallback sets a callback function to handle ALPN Negotiation. + * It causes a client to advertise ALPN. */ SSL_IMPORT SECStatus SSL_SetNextProtoCallback(PRFileDesc *fd, SSLNextProtoCallback callback, void *arg); /* SSL_SetNextProtoNego can be used as an alternative to - * SSL_SetNextProtoCallback. It also causes a client to advertise NPN and - * installs a default callback function which selects the first supported - * protocol in server-preference order. If no matching protocol is found it - * selects the first supported protocol. + * SSL_SetNextProtoCallback. * - * Using this function also allows the client to transparently support ALPN. + * Using this function allows client and server to transparently support ALPN. * The same set of protocols will be advertised via ALPN and, if the server * uses ALPN to select a protocol, SSL_GetNextProto will return * SSL_NEXT_PROTO_SELECTED as the state. * - * Since NPN uses the first protocol as the fallback protocol, when sending an - * ALPN extension, the first protocol is moved to the end of the list. This - * indicates that the fallback protocol is the least preferred. The other - * protocols should be in preference order. + * Because the predecessor to ALPN, NPN, used the first protocol as the fallback + * protocol, when sending an ALPN extension, the first protocol is moved to the + * end of the list. This indicates that the fallback protocol is the least + * preferred. The other protocols should be in preference order. * * The supported protocols are specified in |data| in wire-format (8-bit * length-prefixed). For example: "\010http/1.1\006spdy/2". */ |