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crypto/tls: expand the ConnectionState docs

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Fixes #37572

Change-Id: I493392f535a979ee16609861041da2ecfe21cf77
Reviewed-on: https://go-review.googlesource.com/c/go/+/239744
Run-TryBot: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
This commit is contained in:
Filippo Valsorda 2020-06-24 14:27:32 -04:00
parent 3c6fec86e3
commit 66cb673de6
1 changed files with 63 additions and 19 deletions
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82
src/crypto/tls/common.go
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@ -213,28 +213,72 @@ var testingOnlyForceDowngradeCanary bool
// ConnectionState records basic TLS details about the connection.
type ConnectionState struct {
Version uint16 // TLS version used by the connection (e.g. VersionTLS12)
HandshakeComplete bool // TLS handshake is complete
DidResume bool // connection resumes a previous TLS connection
CipherSuite uint16 // cipher suite in use (TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, ...)
NegotiatedProtocol string // negotiated next protocol (not guaranteed to be from Config.NextProtos)
NegotiatedProtocolIsMutual bool // negotiated protocol was advertised by server (client side only)
ServerName string // server name requested by client, if any
PeerCertificates []*x509.Certificate // certificate chain presented by remote peer
VerifiedChains [][]*x509.Certificate // verified chains built from PeerCertificates
SignedCertificateTimestamps [][]byte // SCTs from the peer, if any
OCSPResponse []byte // stapled OCSP response from peer, if any
// Version is the TLS version used by the connection (e.g. VersionTLS12).
Version uint16
// HandshakeComplete is true if the handshake has concluded.
HandshakeComplete bool
// DidResume is true if this connection was successfully resumed from a
// previous session with a session ticket or similar mechanism.
DidResume bool
// CipherSuite is the cipher suite negotiated for the connection (e.g.
// TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_AES_128_GCM_SHA256).
CipherSuite uint16
// NegotiatedProtocol is the application protocol negotiated with ALPN.
//
// Note that on the client side, this is currently not guaranteed to be from
// Config.NextProtos.
NegotiatedProtocol string
// NegotiatedProtocolIsMutual used to indicate a mutual NPN negotiation.
//
// Deprecated: this value is always true.
NegotiatedProtocolIsMutual bool
// ServerName is the value of the Server Name Indication extension sent by
// the client. It's available both on the server and on the client side.
ServerName string
// PeerCertificates are the parsed certificates sent by the peer, in the
// order in which they were sent. The first element is the leaf certificate
// that the connection is verified against.
//
// On the client side, it can't be empty. On the server side, it can be
// empty if Config.ClientAuth is not RequireAnyClientCert or
// RequireAndVerifyClientCert.
PeerCertificates []*x509.Certificate
// VerifiedChains is a list of one or more chains where the first element is
// PeerCertificates[0] and the last element is from Config.RootCAs (on the
// client side) or Config.ClientCAs (on the server side).
//
// On the client side, it's set if Config.InsecureSkipVerify is false. On
// the server side, it's set if Config.ClientAuth is VerifyClientCertIfGiven
// (and the peer provided a certificate) or RequireAndVerifyClientCert.
VerifiedChains [][]*x509.Certificate
// SignedCertificateTimestamps is a list of SCTs provided by the peer
// through the TLS handshake for the leaf certificate, if any.
SignedCertificateTimestamps [][]byte
// OCSPResponse is a stapled Online Certificate Status Protocol (OCSP)
// response provided by the peer for the leaf certificate, if any.
OCSPResponse []byte
// TLSUnique contains the "tls-unique" channel binding value (see RFC 5929,
// Section 3). This value will be nil for TLS 1.3 connections and for all
// resumed connections.
//
// Deprecated: there are conditions in which this value might not be unique
// to a connection. See the Security Considerations sections of RFC 5705 and
// RFC 7627, and https://mitls.org/pages/attacks/3SHAKE#channelbindings.
TLSUnique []byte
// ekm is a closure exposed via ExportKeyingMaterial.
ekm func(label string, context []byte, length int) ([]byte, error)
// TLSUnique contains the "tls-unique" channel binding value (see RFC
// 5929, section 3). For resumed sessions this value will be nil
// because resumption does not include enough context (see
// https://mitls.org/pages/attacks/3SHAKE#channelbindings). This will
// change in future versions of Go once the TLS master-secret fix has
// been standardized and implemented. It is not defined in TLS 1.3.
TLSUnique []byte
}
// ExportKeyingMaterial returns length bytes of exported key material in a new