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Credentials Manager
==================================================
A ``Credentials_Manager`` is a way to abstract how the application
stores credentials in a way that is usable by protocol
implementations. Currently the main user is the :doc:`tls`
implementation.
.. cpp:class:: Credentials_Manager
.. cpp:function:: std::vector<X509_Certificate> \
trusted_certificate_authorities( \
const std::string& type, \
const std::string& context)
Return the list of trusted certificate authorities.
When *type* is "tls-client", *context* will be the hostname of
the server, or empty if the hostname is not known.
When *type* is "tls-server", the *context* will again be the
hostname of the server, or empty if the client did not send a
server name indicator. For TLS servers, these CAs are the ones
trusted for signing of client certificates. If you do not want
the TLS server to ask for a client cert,
``trusted_certificate_authorities`` should return an empty list
for *type* "tls-server".
The default implementation returns an empty list.
.. cpp::function:: void verify_certificate_chain( \
const std::string& type, \
const std::string& hostname, \
const std::vector<X509_Certificate>& cert_chain)
Verifies the certificate chain in *cert_chain*, assuming the
leaf certificate is the first element.
If *hostname* is set, additionally ``verify_certificate_chain``
will check that the leaf certificate has a DNS entry matching
*hostname*.
In the default implementation the *type* argument is passed,
along with *hostname*, to ``trusted_certificate_authorities`` to
find out what root(s) should be trusted for verifying this
certificate.
This function indicates a validation failure by throwing an
exception.
This function has a default implementation that probably
sufficies for most uses, however can be overrided for
implementing extra validation routines such as public key
pinning.
.. cpp:function:: std::vector<X509_Certificate> cert_chain( \
const std::vector<std::string>& cert_key_types, \
const std::string& type, \
const std::string& context)
Return the certificate chain to use to identify ourselves
.. cpp:function:: std::vector<X509_Certificate> cert_chain_single_type( \
const std::string& cert_key_type, \
const std::string& type, \
const std::string& context)
Return the certificate chain to use to identifier ourselves, if
we have one of type *cert_key_tye* and we would like to use a
certificate in this *type*/*context*.
.. cpp:function:: Private_Key* private_key_for(const X509_Certificate& cert, \
const std::string& type, \
const std::string& context)
Return the private key for this certificate. The *cert* will be
the leaf cert of a chain returned previously by ``cert_chain``
or ``cert_chain_single_type``.
SRP Authentication
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
``Credentials_Manager`` contains the hooks used by TLS clients and
servers for SRP authentication.
.. cpp:function:: bool attempt_srp(const std::string& type, \
const std::string& context)
Returns if we should consider using SRP for authentication
.. cpp:function:: std::string srp_identifier(const std::string& type, \
const std::string& context)
Returns the SRP identifier we'd like to use (used by client)
.. cpp:function:: std::string srp_password(const std::string& type, \
const std::string& context, \
const std::string& identifier)
Returns the password for *identifier* (used by client)
.. cpp:function:: bool srp_verifier(const std::string& type, \
const std::string& context, \
const std::string& identifier, \
std::string& group_name, \
BigInt& verifier, \
std::vector<byte>& salt, \
bool generate_fake_on_unknown)
Returns the SRP verifier information for *identifier* (used by server)
Preshared Keys
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TLS and some other protocols support the use of pre shared keys for
authentication.
.. cpp:function:: SymmetricKey psk(const std::string& type, \
const std::string& context, \
const std::string& identity)
Return a symmetric key for use with *identity*
.. cpp:function:: std::string psk_identity_hint(const std::string& type, \
const std::string& context)
Returns an identity hint which may be provided to the client. This
can help a client understand what PSK to use.
.. cpp:function:: std::string psk_identity(const std::string& type, \
const std::string& context, \
const std::string& identity_hint)
Returns the identity we would like to use given this *type* and
*context* and the optional *identity_hint*. Not all servers or
protocols will provide a hint.
|
