nuts-node #########
Open-source implementation of did:web, OpenID4VC, PEX, private key management and related logic. It enables secure and trusted data exchange between organizations. It contains all the necessary components for secure discovery and authorization.
See the documentation <https://nuts-node.readthedocs.io/en/stable/>_ for how to set up, integrate and use the Nuts node.
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Development ^^^^^^^^^^^
.. |gover| image:: https://img.shields.io/github/go-mod/go-version/nuts-foundation/nuts-node :alt: GitHub go.mod Go version
|gover| or higher is required.
Building
Just use go build.
To enable ES256K (Koblitz) support, you need to build with the jwx_es256k tag:
.. code-block:: shell
go build -tags jwx_es256kYou can build and run the Nuts node on more exotic environments, e.g. Raspberry Pis:
env GOOS=linux GOARCH=arm GOARM=6 go buildRunning tests
Tests can be run by executing
.. code-block:: shell
go test ./...Code Generation
Code generation is used for generating mocks, OpenAPI client- and servers, and gRPC services.
Make sure that GOPATH/bin is available on PATH and that the dependencies are installed
Install protoc:
| MacOS: brew install protobuf
| Linux: apt install -y protobuf-compiler
Install Go tools:
.. code-block:: shell
make install-tools
Generating code:
To regenerate all code run the run-generators target from the makefile or use one of the following for a specific group
================ =======================
Group Command
================ =======================
Mocks make gen-mocks
OpenApi make gen-api
Protobuf + gRCP make gen-protobuf
All make run-generators
================ =======================
The readme is auto-generated from a template and uses the documentation to fill in the blanks.
.. code-block:: shell
make gen-readmeThe documentation can be build by running the following command from the /docs directory:
.. code-block:: shell
make htmlConfiguration ^^^^^^^^^^^^^
The Nuts node can be configured using a YAML configuration file, environment variables and commandline params.
The parameters follow the following convention:
$ nuts --parameter X is equal to $ NUTS_PARAMETER=X nuts is equal to parameter: X in a yaml file.
Or for this piece of yaml
.. code-block:: yaml
nested:
parameter: Xis equal to $ nuts --nested.parameter X is equal to $ NUTS_NESTED_PARAMETER=X nuts
Config parameters for engines are prepended by the engine.ConfigKey by default (configurable):
.. code-block:: yaml
engine:
nested:
parameter: Xis equal to $ nuts --engine.nested.parameter X is equal to $ NUTS_ENGINE_NESTED_PARAMETER=X nuts
While most options are a single value, some are represented as a list (indicated with the square brackets in the table below).
To provide multiple values through flags or environment variables you can separate them with a comma (var1,var2).
If you need to provide an actual value with a comma, you can escape it with a backslash (\,) to avoid it having split into multiple values.
Ordering
Command line parameters have the highest priority, then environment variables, then parameters from the configfile and lastly defaults.
The location of the configfile is determined by the environment variable NUTS_CONFIGFILE or the commandline parameter --configfile. If both are missing the default location ./nuts.yaml is used. ::
CLI > ENV > Config File > DefaultsServer options
The following options can be configured on the server:
.. marker-for-config-options
.. table:: Server Options :widths: 20 30 50 :class: options-table
======================================== =================================================================================================================================================================================================================================================================================================================================================================================================================================================================== ============================================================================================================================================================================================================================================================================================================================================
Key Default Description
======================================== =================================================================================================================================================================================================================================================================================================================================================================================================================================================================== ============================================================================================================================================================================================================================================================================================================================================
configfile ./config/nuts.yaml Nuts config file
cpuprofile When set, a CPU profile is written to the given path. Ignored when strictmode is set.
datadir ./data Directory where the node stores its files.
didmethods [web,nuts] Comma-separated list of enabled DID methods (without did: prefix). It also controls the order in which DIDs are returned by APIs, and which DID is used for signing if the verifying party does not impose restrictions on the DID method used.
internalratelimiter true When set, expensive internal calls are rate-limited to protect the network. Always enabled in strict mode.
loggerformat text Log format (text, json)
strictmode true When set, insecure settings are forbidden.
url Public facing URL of the server (required). Must be HTTPS when strictmode is set.
verbosity info Log level (trace, debug, info, warn, error)
httpclient.timeout 30s Request time-out for HTTP clients, such as '10s'. Refer to Golang's 'time.Duration' syntax for a more elaborate description of the syntax.
**Auth**
auth.authorizationendpoint.enabled false enables the v2 API's OAuth2 Authorization Endpoint, used by OpenID4VP and OpenID4VCI. This flag might be removed in a future version (or its default become 'true') as the use cases and implementation of OpenID4VP and OpenID4VCI mature.
**Crypto**
crypto.storage Storage to use, 'fs' for file system (for development purposes), 'vaultkv' for HashiCorp Vault KV store, 'azure-keyvault' for Azure Key Vault, 'external' for an external backend (deprecated).
crypto.azurekv.hsm false Whether to store the key in a hardware security module (HSM). If true, the Azure Key Vault must be configured for HSM usage. Default: false
crypto.azurekv.timeout 10s Timeout of client calls to Azure Key Vault, in Golang time.Duration string format (e.g. 10s).
crypto.azurekv.url The URL of the Azure Key Vault.
crypto.azurekv.auth.type default Credential type to use when authenticating to the Azure Key Vault. Options: default, managed_identity (see https://github.com/Azure/azure-sdk-for-go/blob/main/sdk/azidentity/README.md for an explanation of the options).
crypto.vault.address The Vault address. If set it overwrites the VAULT_ADDR env var.
crypto.vault.pathprefix kv The Vault path prefix.
crypto.vault.timeout 5s Timeout of client calls to Vault, in Golang time.Duration string format (e.g. 1s).
crypto.vault.token The Vault token. If set it overwrites the VAULT_TOKEN env var.
**Discovery**
discovery.client.refresh_interval 10m0s Interval at which the client synchronizes with the Discovery Server; refreshing Verifiable Presentations of local DIDs and loading changes, updating the local copy. It only will actually refresh registrations of local DIDs that about to expire (less than 1/4th of their lifetime left). Specified as Golang duration (e.g. 1m, 1h30m).
discovery.definitions.directory ./config/discovery Directory to load Discovery Service Definitions from. If not set, the discovery service will be disabled. If the directory contains JSON files that can't be parsed as service definition, the node will fail to start.
discovery.server.ids [] IDs of the Discovery Service for which to act as server. If an ID does not map to a loaded service definition, the node will fail to start.
**HTTP**
http.clientipheader X-Forwarded-For Case-sensitive HTTP Header that contains the client IP used for audit logs. For the X-Forwarded-For header only link-local, loopback, and private IPs are excluded. Switch to X-Real-IP or a custom header if you see your own proxy/infra in the logs.
http.log metadata What to log about HTTP requests. Options are 'nothing', 'metadata' (log request method, URI, IP and response code), and 'metadata-and-body' (log the request and response body, in addition to the metadata). When debug vebosity is set the authorization headers are also logged when the request is fully logged.
http.cache.maxbytes 10485760 HTTP client maximum size of the response cache in bytes. If 0, the HTTP client does not cache responses.
http.internal.address 127.0.0.1:8081 Address and port the server will be listening to for internal-facing endpoints.
http.internal.auth.audience Expected audience for JWT tokens (default: hostname)
http.internal.auth.authorizedkeyspath Path to an authorized_keys file for trusted JWT signers
http.internal.auth.type Whether to enable authentication for /internal endpoints, specify 'token_v2' for bearer token mode or 'token' for legacy bearer token mode.
http.public.address \:8080 Address and port the server will be listening to for public-facing endpoints.
**JSONLD**
jsonld.contexts.localmapping [https://nuts.nl/credentials/2024=assets/contexts/nuts-2024.ldjson,https://nuts.nl/credentials/v1=assets/contexts/nuts.ldjson,https://schema.org=assets/contexts/schema-org-v13.ldjson,https://w3c-ccg.github.io/lds-jws2020/contexts/lds-jws2020-v1.json=assets/contexts/lds-jws2020-v1.ldjson,https://w3id.org/vc/status-list/2021/v1=assets/contexts/w3c-statuslist2021.ldjson,https://www.w3.org/2018/credentials/v1=assets/contexts/w3c-credentials-v1.ldjson] This setting allows mapping external URLs to local files for e.g. preventing external dependencies. These mappings have precedence over those in remoteallowlist.
jsonld.contexts.remoteallowlist [https://schema.org,https://www.w3.org/2018/credentials/v1,https://w3c-ccg.github.io/lds-jws2020/contexts/lds-jws2020-v1.json,https://w3id.org/vc/status-list/2021/v1] In strict mode, fetching external JSON-LD contexts is not allowed except for context-URLs listed here.
**PKI**
pki.maxupdatefailhours 4 Maximum number of hours that a denylist update can fail
pki.softfail true Do not reject certificates if their revocation status cannot be established when softfail is true
**Storage**
storage.session.memcached.address [] List of Memcached server addresses. These can be a simple 'host:port' or a Memcached connection URL with scheme, auth and other options.
storage.session.redis.address Redis session database server address. This can be a simple 'host:port' or a Redis connection URL with scheme, auth and other options. If not set it, defaults to an in-memory database.
storage.session.redis.database Redis session database name, which is used as prefix every key. Can be used to have multiple instances use the same Redis instance.
storage.session.redis.password Redis session database password. If set, it overrides the username in the connection URL.
storage.session.redis.username Redis session database username. If set, it overrides the username in the connection URL.
storage.session.redis.tls.truststorefile PEM file containing the trusted CA certificate(s) for authenticating remote Redis session servers. Can only be used when connecting over TLS (use 'rediss://' as scheme in address).
storage.sql.connection Connection string for the SQL database. If not set it, defaults to a SQLite database stored inside the configured data directory. Note: using SQLite is not recommended in production environments. If using SQLite anyways, remember to enable foreign keys ('_foreign_keys=on') and the write-ahead-log ('_journal_mode=WAL').
**policy**
policy.directory ./config/policy Directory to read policy files from. Policy files are JSON files that contain a scope to PresentationDefinition mapping.
======================================== =================================================================================================================================================================================================================================================================================================================================================================================================================================================================== ============================================================================================================================================================================================================================================================================================================================================Options specific for did:nuts/gRPC
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The following table contains additional (deprecated) options that are relevant for use cases that use did:nuts DIDs and/or the gRPC network.
If your use case does not use these features, you can ignore this table.
.. table:: did:nuts/gRPC Server Options :widths: 20 30 50 :class: options-table
================================ =========================== ======================================================================================================================================================================================
Key Default Description
================================ =========================== ======================================================================================================================================================================================
tls.certfile PEM file containing the certificate for the gRPC server (also used as client certificate). Required in strict mode.
tls.certheader Name of the HTTP header that will contain the client certificate when TLS is offloaded for gRPC.
tls.certkeyfile PEM file containing the private key of the gRPC server certificate. Required in strict mode.
tls.offload Whether to enable TLS offloading for incoming gRPC connections. Enable by setting it to 'incoming'. If enabled 'tls.certheader' must be configured as well.
tls.truststorefile ./config/ssl/truststore.pem PEM file containing the trusted CA certificates for authenticating remote gRPC servers. Required in strict mode.
**Auth**
auth.accesstokenlifespan 60 defines how long (in seconds) an access token is valid. Uses default in strict mode.
auth.clockskew 5000 allowed JWT Clock skew in milliseconds
auth.contractvalidators [irma,dummy,employeeid] sets the different contract validators to use
auth.irma.autoupdateschemas true set if you want automatically update the IRMA schemas every 60 minutes.
auth.irma.schememanager pbdf IRMA schemeManager to use for attributes. Can be either 'pbdf' or 'irma-demo'.
auth.irma.cors.origin [] sets the allowed CORS origins for the IRMA server
**Events**
events.nats.hostname 0.0.0.0 Hostname for the NATS server
events.nats.port 4222 Port where the NATS server listens on
events.nats.storagedir Directory where file-backed streams are stored in the NATS server
events.nats.timeout 30 Timeout for NATS server operations
**GoldenHammer**
goldenhammer.enabled true Whether to enable automatically fixing DID documents with the required endpoints.
goldenhammer.interval 10m0s The interval in which to check for DID documents to fix.
**Network**
network.bootstrapnodes [] List of bootstrap nodes ('<host>:<port>') which the node initially connect to.
network.connectiontimeout 5000 Timeout before an outbound connection attempt times out (in milliseconds).
network.enablediscovery true Whether to enable automatic connecting to other nodes.
network.grpcaddr \:5555 Local address for gRPC to listen on. If empty the gRPC server won't be started and other nodes will not be able to connect to this node (outbound connections can still be made).
network.maxbackoff 24h0m0s Maximum between outbound connections attempts to unresponsive nodes (in Golang duration format, e.g. '1h', '30m').
network.nodedid Specifies the DID of the party that operates this node. It is used to identify the node on the network. If the DID document does not exist of is deactivated, the node will not start.
network.protocols [] Specifies the list of network protocols to enable on the server. They are specified by version (1, 2). If not set, all protocols are enabled.
network.v2.diagnosticsinterval 5000 Interval (in milliseconds) that specifies how often the node should broadcast its diagnostic information to other nodes (specify 0 to disable).
network.v2.gossipinterval 5000 Interval (in milliseconds) that specifies how often the node should gossip its new hashes to other nodes.
**Storage**
storage.bbolt.backup.directory Target directory for BBolt database backups.
storage.bbolt.backup.interval 0s Interval, formatted as Golang duration (e.g. 10m, 1h) at which BBolt database backups will be performed.
storage.redis.address Redis database server address. This can be a simple 'host:port' or a Redis connection URL with scheme, auth and other options.
storage.redis.database Redis database name, which is used as prefix every key. Can be used to have multiple instances use the same Redis instance.
storage.redis.password Redis database password. If set, it overrides the username in the connection URL.
storage.redis.username Redis database username. If set, it overrides the username in the connection URL.
storage.redis.sentinel.master Name of the Redis Sentinel master. Setting this property enables Redis Sentinel.
storage.redis.sentinel.nodes [] Addresses of the Redis Sentinels to connect to initially. Setting this property enables Redis Sentinel.
storage.redis.sentinel.password Password for authenticating to Redis Sentinels.
storage.redis.sentinel.username Username for authenticating to Redis Sentinels.
storage.redis.tls.truststorefile PEM file containing the trusted CA certificate(s) for authenticating remote Redis servers. Can only be used when connecting over TLS (use 'rediss://' as scheme in address).
**VCR**
vcr.openid4vci.definitionsdir Directory with the additional credential definitions the node could issue (experimental, may change without notice).
vcr.openid4vci.enabled true Enable issuing and receiving credentials over OpenID4VCI.
vcr.openid4vci.timeout 30s Time-out for OpenID4VCI HTTP client operations.
================================ =========================== ======================================================================================================================================================================================This table is automatically generated using the configuration flags in the core and engines. When they're changed the options table must be regenerated using the Makefile:
.. code-block:: shell
$ make docsSecrets
All options ending with token or password are considered secrets and can only be set through environment variables or the config file.
Strict mode
Several of the server options above allow the node to be configured in a way that is unsafe for production environments, but are convenient for testing or development.
The node can be configured to run in strict mode (default) to prevent any insecure configurations.
Below is a summary of the impact strictmode=true has on the node and its configuration.
Save storage of any private key material and data requires some serious consideration.
For this reason the crypto.storage backend and the storage.sql.connection connection string must explicitly be set.
Private transactions can only be exchanged over authenticated nodes.
Therefore is requires TLS to be configured through tls.{certfile,certkeyfile,truststore}.
To verify that authentication is correctly configured on your node, check the network.auth_config status on the /health endpoint.
See :ref:Monitoring <nuts-node-monitoring> for more details.
The incorporated IRMA server <https://irma.app/docs/irma-server/#production-mode>_ is automatically changed to production mode.
In fact, running in strict mode is the only way to enable IRMA's production mode.
In addition, it requires auth.irma.schememanager=pbdf.
As a general safety precaution auth.contractvalidators ignores the dummy option if configured,
requesting an access token from another node on /n2n/auth/v1/accesstoken does not return any error details,
auth.accesstokenlifespan is always 60 seconds,
json-ld context can only be downloaded from trusted domains configured in jsonld.contexts.remoteallowlist,
and the internalratelimiter is always on.
Interacting with remote Nuts nodes requires HTTPS: it will refuse to connect to plain HTTP endpoints when in strict mode.