mirror of
https://mau.dev/maunium/synapse.git
synced 2024-12-21 07:04:05 +01:00
77 lines
4.1 KiB
Markdown
77 lines
4.1 KiB
Markdown
# SAML Mapping Providers
|
|
|
|
A SAML mapping provider is a Python class (loaded via a Python module) that
|
|
works out how to map attributes of a SAML response object to Matrix-specific
|
|
user attributes. Details such as user ID localpart, displayname, and even avatar
|
|
URLs are all things that can be mapped from talking to a SSO service.
|
|
|
|
As an example, a SSO service may return the email address
|
|
"john.smith@example.com" for a user, whereas Synapse will need to figure out how
|
|
to turn that into a displayname when creating a Matrix user for this individual.
|
|
It may choose `John Smith`, or `Smith, John [Example.com]` or any number of
|
|
variations. As each Synapse configuration may want something different, this is
|
|
where SAML mapping providers come into play.
|
|
|
|
## Enabling Providers
|
|
|
|
External mapping providers are provided to Synapse in the form of an external
|
|
Python module. Retrieve this module from [PyPi](https://pypi.org) or elsewhere,
|
|
then tell Synapse where to look for the handler class by editing the
|
|
`saml2_config.user_mapping_provider.module` config option.
|
|
|
|
`saml2_config.user_mapping_provider.config` allows you to provide custom
|
|
configuration options to the module. Check with the module's documentation for
|
|
what options it provides (if any). The options listed by default are for the
|
|
user mapping provider built in to Synapse. If using a custom module, you should
|
|
comment these options out and use those specified by the module instead.
|
|
|
|
## Building a Custom Mapping Provider
|
|
|
|
A custom mapping provider must specify the following methods:
|
|
|
|
* `__init__(self, parsed_config)`
|
|
- Arguments:
|
|
- `parsed_config` - A configuration object that is the return value of the
|
|
`parse_config` method. You should set any configuration options needed by
|
|
the module here.
|
|
* `saml_response_to_user_attributes(self, saml_response, failures)`
|
|
- Arguments:
|
|
- `saml_response` - A `saml2.response.AuthnResponse` object to extract user
|
|
information from.
|
|
- `failures` - An `int` that represents the amount of times the returned
|
|
mxid localpart mapping has failed. This should be used
|
|
to create a deduplicated mxid localpart which should be
|
|
returned instead. For example, if this method returns
|
|
`john.doe` as the value of `mxid_localpart` in the returned
|
|
dict, and that is already taken on the homeserver, this
|
|
method will be called again with the same parameters but
|
|
with failures=1. The method should then return a different
|
|
`mxid_localpart` value, such as `john.doe1`.
|
|
- This method must return a dictionary, which will then be used by Synapse
|
|
to build a new user. The following keys are allowed:
|
|
* `mxid_localpart` - Required. The mxid localpart of the new user.
|
|
* `displayname` - The displayname of the new user. If not provided, will default to
|
|
the value of `mxid_localpart`.
|
|
* `parse_config(config)`
|
|
- This method should have the `@staticmethod` decoration.
|
|
- Arguments:
|
|
- `config` - A `dict` representing the parsed content of the
|
|
`saml2_config.user_mapping_provider.config` homeserver config option.
|
|
Runs on homeserver startup. Providers should extract any option values
|
|
they need here.
|
|
- Whatever is returned will be passed back to the user mapping provider module's
|
|
`__init__` method during construction.
|
|
* `get_saml_attributes(config)`
|
|
- This method should have the `@staticmethod` decoration.
|
|
- Arguments:
|
|
- `config` - A object resulting from a call to `parse_config`.
|
|
- Returns a tuple of two sets. The first set equates to the saml auth
|
|
response attributes that are required for the module to function, whereas
|
|
the second set consists of those attributes which can be used if available,
|
|
but are not necessary.
|
|
|
|
## Synapse's Default Provider
|
|
|
|
Synapse has a built-in SAML mapping provider if a custom provider isn't
|
|
specified in the config. It is located at
|
|
[`synapse.handlers.saml_handler.DefaultSamlMappingProvider`](../synapse/handlers/saml_handler.py).
|