Emitted during the TLS handshake after the peer certificate has been received.
You can examine
peer_cert's certification path by calling
get_issuer on it.
For a client-side connection,
peer_cert is the server's certificate, and the signal will only be emitted if the certificate was
not acceptable according to
validation_flags. If you would like the certificate to be accepted despite
errors, return true
from the signal handler. Otherwise, if no handler accepts the certificate, the handshake will fail with
GLib guarantees that if certificate verification fails, this signal will be emitted with at least one error will be set in
but it does not guarantee that all possible errors will be set. Accordingly, you may not safely decide to ignore any particular type of error.
For example, it would be incorrect to ignore g_tls_certificate_expired if you want to allow expired
certificates, because this could potentially be the only error flag set even if other problems exist with the certificate.
For a server-side connection,
peer_cert is the certificate presented by the client, if this was requested via the server's
authentication_mode. On the server side, the
signal is always emitted when the client presents a certificate, and the certificate will only be accepted if a handler returns
Note that if this signal is emitted as part of asynchronous I/O in the main thread, then you should not attempt to interact with the user before returning from the signal handler. If you want to let the user decide whether or not to accept the certificate, you would have to return false from the signal handler on the first attempt, and then after the connection attempt returns a g_tls_error_bad_certificate, you can interact with the user, and if the user decides to accept the certificate, remember that fact, create a new connection, and return true from the signal handler the next time.
If you are doing I/O in another thread, you do not need to worry about this, and can simply block in the signal handler until the UI thread returns an answer.
the peer's TlsCertificate
the problems with
true to accept