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|XML cryptographic libraries|
The SSL package provides several libraries dealing with cryptographic
operations of XML documents. These libraries depend on the
package. These libraries are part of this package because the
sgml package has no external dependencies and will thus be
available in any SWI-Prolog installation while configuring and building
ssl package is much more involved.
There are four primary integration points for applications to use this code: 1) You must declare at least one service provider (SP) 2) You must declare at least one identity provider (IdP) per SP 3) Finally, you can call
saml_authenticate(+SP, +IdP, +Callback, +Request)to obtain assertions The asynchronous nature of the SAML process means that a callback must be used. Assuming that the IdP was able to provide at least some valid assertions about the user, after calling Callback with 2 extra arguments (a list of the assertion terms and the URL being request by the user), the user will be redirected back to their original URL. It is therefore up to the callback to ensure that this does not simply trigger another round of SAML negotiations - for example, by throwing
http_reply(forbidden(RequestURL))if the assertions are not strong enough 4) Finally, your SP metadata will be available from the web server directly. This is required to configure the IdP. This will be available at './metadata.xml', relative to the LocationSpec provided when the SP was declared.
saml_sp(+ServiceProvider: atom, +LocationSpec: term, +PrivateKeySpec: term, +Password: atom +CertificateSpec: term, +Options: list).
The ServiceProvider is the identifier of your service. Ideally, this should be a fully-qualified URI The LocationSpec is a location that the HTTP dispatch layer will understand for example '.' or
root('saml'). The Private KeySpec is a 'file specifier' that resolves to a private key (see below for specifiers) The Password is a password used for reading the private key. If the key is not encrypted, any atom can be supplied as it will be ignored The CertificateSpec is a file specifier that resolves to a certificate holding the public key corresponding to PrivateKeySPec There are currently no implemented options (the list is ignored).
saml_idp(+ServiceProvider: atom, +MetadataSpec: term). ServiceProvider is the identifier used when declaring your SP. You do not need to declare them in a particular order, but both must be present in the system before running saml_authenticate/4. MetadataSpec is a file specifier that resolves to the metadata for the IdP. Most IdPs will be able to provide this on request
File Specifiers: The following specifiers are supported for locating files:
file(Filename): The local file Filename
resource(Resource): The prolog resource Resource. See resource/3
url(URL): The file identified by the HTTP (or HTTPS if you have the HTTPS plugin loaded) URL
This library uses SAML to exchange messages with an Identity Provider to establish assertions about the current user's session. It operates only as the service end, not the identity provider end.
This library is a partial implementation of the XML encryption standard. It implements the decryption part, which is needed by SAML clients.
|KeyCallback||may be called as follows:
This library deals with XMLDSIG, RSA signed XML documents.
The SignedDOM must be emitted using xml_write/3
xml_write_canonical/3. If xml_write/3
is used, the option
layout(false) is needed to avoid changing the layout of the
SignedInfo element and the signed DOM, which
will cause the signature to be invalid.
ds:Signatureelement contains a valid signature. Certificate is bound to the certificate that appears in the element if the signature is valid. It is up to the caller to determine if the certificate is trusted or not.
Note: The DOM and SignatureDOM must have
been obtained using the load_structure/3
keep_prefix(true) otherwise it is impossible to
generate an identical document for checking the signature. See also xml_write_canonical/3.