class QSsl

The QSsl namespace declares enums common to all SSL classes in Qt Network. More…

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Detailed Description

class KeyType

Describes the two types of keys QSslKey supports.

Constant	Description
QSsl.PrivateKey	A private key.
QSsl.PublicKey	A public key.

class EncodingFormat

Describes supported encoding formats for certificates and keys.

Constant	Description
QSsl.Pem	The PEM format.
QSsl.Der	The DER format.

class KeyAlgorithm

Describes the different key algorithms supported by QSslKey .

Constant	Description
QSsl.Rsa	The RSA algorithm.
QSsl.Dsa	The DSA algorithm.
QSsl.Ec	The Elliptic Curve algorithm.
QSsl.Dh	The Diffie-Hellman algorithm.
QSsl.Opaque	A key that should be treated as a ‘black box’ by QSslKey .

The opaque key facility allows applications to add support for facilities such as PKCS#11 that Qt does not currently offer natively.

class AlternativeNameEntryType

Describes the key types for alternative name entries in QSslCertificate .

Constant	Description
QSsl.EmailEntry	An email entry; the entry contains an email address that the certificate is valid for.
QSsl.DnsEntry	A DNS host name entry; the entry contains a host name entry that the certificate is valid for. The entry may contain wildcards.
QSsl.IpAddressEntry	An IP address entry; the entry contains an IP address entry that the certificate is valid for, introduced in Qt 5.13.

See also

subjectAlternativeNames()

class SslProtocol

Describes the protocol of the cipher.

Constant	Description
QSsl.TlsV1_0	TLSv1.0
QSsl.TlsV1_0OrLater	TLSv1.0 and later versions.
QSsl.TlsV1_1	TLSv1.1.
QSsl.TlsV1_1OrLater	TLSv1.1 and later versions.
QSsl.TlsV1_2	TLSv1.2.
QSsl.TlsV1_2OrLater	TLSv1.2 and later versions.
QSsl.DtlsV1_0	DTLSv1.0
QSsl.DtlsV1_0OrLater	DTLSv1.0 and later versions.
QSsl.DtlsV1_2	DTLSv1.2
QSsl.DtlsV1_2OrLater	DTLSv1.2 and later versions.
QSsl.TlsV1_3	TLSv1.3. (Since Qt 5.12)
QSsl.TlsV1_3OrLater	TLSv1.3 and later versions. (Since Qt 5.12)
QSsl.UnknownProtocol	The cipher’s protocol cannot be determined.
QSsl.AnyProtocol	Any supported protocol. This value is used by QSslSocket only.
QSsl.SecureProtocols	The default option, using protocols known to be secure.

class SslOption

(inherits enum.Flag) Describes the options that can be used to control the details of SSL behaviour. These options are generally used to turn features off to work around buggy servers.

Constant	Description
QSsl.SslOptionDisableEmptyFragments	Disables the insertion of empty fragments into the data when using block ciphers. When enabled, this prevents some attacks (such as the BEAST attack), however it is incompatible with some servers.
QSsl.SslOptionDisableSessionTickets	Disables the SSL session ticket extension. This can cause slower connection setup, however some servers are not compatible with the extension.
QSsl.SslOptionDisableCompression	Disables the SSL compression extension. When enabled, this allows the data being passed over SSL to be compressed, however some servers are not compatible with this extension.
QSsl.SslOptionDisableServerNameIndication	Disables the SSL server name indication extension. When enabled, this tells the server the virtual host being accessed allowing it to respond with the correct certificate.
QSsl.SslOptionDisableLegacyRenegotiation	Disables the older insecure mechanism for renegotiating the connection parameters. When enabled, this option can allow connections for legacy servers, but it introduces the possibility that an attacker could inject plaintext into the SSL session.
QSsl.SslOptionDisableSessionSharing	Disables SSL session sharing via the session ID handshake attribute.
QSsl.SslOptionDisableSessionPersistence	Disables storing the SSL session in ASN.1 format as returned by sessionTicket() . Enabling this feature adds memory overhead of approximately 1K per used session ticket.
QSsl.SslOptionDisableServerCipherPreference	Disables selecting the cipher chosen based on the servers preferences rather than the order ciphers were sent by the client. This option is only relevant to server sockets, and is only honored by the OpenSSL backend.

By default, SslOptionDisableEmptyFragments is turned on since this causes problems with a large number of servers. SslOptionDisableLegacyRenegotiation is also turned on, since it introduces a security risk. SslOptionDisableCompression is turned on to prevent the attack publicised by CRIME. SslOptionDisableSessionPersistence is turned on to optimize memory usage. The other options are turned off.

Note

Availability of above options depends on the version of the SSL backend in use.

class AlertLevel

Describes the level of an alert message

This enum describes the level of an alert message that was sent or received.

Constant	Description
QSsl.AlertLevel.Warning	Non-fatal alert message
QSsl.AlertLevel.Fatal	Fatal alert message, the underlying backend will handle such an alert properly and close the connection.
QSsl.AlertLevel.Unknown	An alert of unknown level of severity.

class AlertType

Enumerates possible codes that an alert message can have

See RFC 8446, section 6 for the possible values and their meaning.

Constant	Description
QSsl.AlertType.CloseNotify	,
QSsl.AlertType.UnexpectedMessage
QSsl.AlertType.BadRecordMac
QSsl.AlertType.RecordOverflow
QSsl.AlertType.DecompressionFailure
QSsl.AlertType.HandshakeFailure
QSsl.AlertType.NoCertificate
QSsl.AlertType.BadCertificate
QSsl.AlertType.UnsupportedCertificate
QSsl.AlertType.CertificateRevoked
QSsl.AlertType.CertificateExpired
QSsl.AlertType.CertificateUnknown
QSsl.AlertType.IllegalParameter
QSsl.AlertType.UnknownCa
QSsl.AlertType.AccessDenied
QSsl.AlertType.DecodeError
QSsl.AlertType.DecryptError
QSsl.AlertType.ExportRestriction
QSsl.AlertType.ProtocolVersion
QSsl.AlertType.InsufficientSecurity
QSsl.AlertType.InternalError
QSsl.AlertType.InappropriateFallback
QSsl.AlertType.UserCancelled
QSsl.AlertType.NoRenegotiation
QSsl.AlertType.MissingExtension
QSsl.AlertType.UnsupportedExtension
QSsl.AlertType.CertificateUnobtainable
QSsl.AlertType.UnrecognizedName
QSsl.AlertType.BadCertificateStatusResponse
QSsl.AlertType.BadCertificateHashValue
QSsl.AlertType.UnknownPskIdentity
QSsl.AlertType.CertificateRequired
QSsl.AlertType.NoApplicationProtocol
QSsl.AlertType.UnknownAlertMessage

class ImplementedClass

Enumerates classes that a TLS backend implements

In QtNetwork , some classes have backend-specific implementation and thus can be left unimplemented. Enumerators in this enum indicate, which class has a working implementation in the backend.

Constant	Description
QSsl.ImplementedClass.Key	Class QSslKey .
QSsl.ImplementedClass.Certificate	Class QSslCertificate .
QSsl.ImplementedClass.Socket	Class QSslSocket .
QSsl.ImplementedClass.DiffieHellman	Class QSslDiffieHellmanParameters .
QSsl.ImplementedClass.EllipticCurve	Class QSslEllipticCurve .
QSsl.ImplementedClass.Dtls	Class QDtls .
QSsl.ImplementedClass.DtlsCookie	Class QDtlsClientVerifier .

Added in version 6.1.

class SupportedFeature

Enumerates possible features that a TLS backend supports

In QtNetwork TLS-related classes have public API, that may be left unimplemented by some backend, for example, our SecureTransport backend does not support server-side ALPN. Enumerators from SupportedFeature enum indicate that a particular feature is supported.

Constant	Description
QSsl.SupportedFeature.CertificateVerification	Indicates that verify() is implemented by the backend.
QSsl.SupportedFeature.ClientSideAlpn	Client-side ALPN (Application Layer Protocol Negotiation).
QSsl.SupportedFeature.ServerSideAlpn	Server-side ALPN.
QSsl.SupportedFeature.Ocsp	OCSP stapling (Online Certificate Status Protocol).
QSsl.SupportedFeature.Psk	Pre-shared keys.
QSsl.SupportedFeature.SessionTicket	Session tickets.
QSsl.SupportedFeature.Alerts	Information about alert messages sent and received.

Added in version 6.1.