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Travis Groth febf9464a4 Switch options parsing to viper

2019-05-25 15:06:32 -04:00

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Configuration

Pomerium can use a combination of a YAML/JSON/TOML configuration file and environmental variables to set configuration settings.

If you are coming from a kubernetes or docker background this should feel familiar. If not, check out the following primers.

In general, any setting specified by environment variable can also be present in the optional config file as the same name but lower cased. Environment variables take precedence.

Global settings

These are configuration variables shared by all services, in all service modes.

Service Mode

Environmental Variable: SERVICES
Config File Key: services
Type: string
Default: all
Options: all authenticate authorize or proxy

Service mode sets the pomerium service(s) to run. If testing, you may want to set to all and run pomerium in "all-in-one mode." In production, you'll likely want to spin up several instances of each service mode for high availability.

Address

Environmental Variable: ADDRESS
Config File Key: address
Type: string
Example: :https, :443, :8443
Default: :https
Required

Address specifies the host and port to serve HTTPS and gRPC requests from. If empty, :https/:443 is used.

Shared Secret

Environmental Variable: SHARED_SECRET
Config File Key: shared_secret
Type: base64 encoded string
Required

Shared Secret is the base64 encoded 256-bit key used to mutually authenticate requests between services. It's critical that secret keys are random, and store safely. Use a key management system or /dev/urandom/ to generate a key. For example:

head -c32 /dev/urandom | base64

Debug

Environmental Variable: POMERIUM_DEBUG
Config File Key: pomerium_debug
Type: bool
Default: false

By default, JSON encoded logs are produced. Debug enables colored, human-readable logs to be streamed to standard out. In production, it's recommended to be set to false.

For example, if true

10:37AM INF cmd/pomerium version=v0.0.1-dirty+ede4124
10:37AM INF proxy: new route from=httpbin.corp.beyondperimeter.com to=https://httpbin.org
10:37AM INF proxy: new route from=ssl.corp.beyondperimeter.com to=http://neverssl.com
10:37AM INF proxy/authenticator: grpc connection OverrideCertificateName= addr=auth.corp.beyondperimeter.com:443

If false

{"level":"info","version":"v0.0.1-dirty+ede4124","time":"2019-02-18T10:41:03-08:00","message":"cmd/pomerium"}
{"level":"info","from":"httpbin.corp.beyondperimeter.com","to":"https://httpbin.org","time":"2019-02-18T10:41:03-08:00","message":"proxy: new route"}
{"level":"info","from":"ssl.corp.beyondperimeter.com","to":"http://neverssl.com","time":"2019-02-18T10:41:03-08:00","message":"proxy: new route"}
{"level":"info","OverrideCertificateName":"","addr":"auth.corp.beyondperimeter.com:443","time":"2019-02-18T10:41:03-08:00","message":"proxy/authenticator: grpc connection"}

Log Level

Environmental Variable: LOG_LEVEL
Config File Key: log_level
Type: string
Options: debug info warn error
Default: debug

Log level sets the global logging level for pomerium. Only logs of the desired level and above will be logged.

Certificate

Environmental Variable: either CERTIFICATE or CERTIFICATE_FILE
Config File Key: certificate or certificate_file
Type: base64 encoded string or relative file location
Required

Certificate is the x509 public-key used to establish secure HTTP and gRPC connections. If unset, pomerium will attempt to find and use ./cert.pem.

Certificate Key

Environmental Variable: either CERTIFICATE_KEY or CERTIFICATE_KEY_FILE
Config File Key: certificate_key or certificate_key_file
Type: base64 encoded string
Required

Certificate key is the x509 private-key used to establish secure HTTP and gRPC connections. If unset, pomerium will attempt to find and use ./privkey.pem.

Global Timeouts

Environmental Variables: TIMEOUT_READ TIMEOUT_WRITE TIMEOUT_READ_HEADER TIMEOUT_IDLE
Config File Key: timeout_read timeout_write timeout_read_header timeout_idle
Type: Go Duration string
Example: TIMEOUT_READ=30s
Defaults: TIMEOUT_READ_HEADER=10s TIMEOUT_READ=30s TIMEOUT_WRITE=0 TIMEOUT_IDLE=5m

Timeouts set the global server timeouts. For route-specific timeouts, see policy.

For a deep dive on timeout values see these two excellent blog posts.

HTTP Redirect Address

Environmental Variable: HTTP_REDIRECT_ADDR
Config File Key: http_redirect_addr
Type: string
Example: :80, :http, :8080
Optional

If set, the HTTP Redirect Address specifies the host and port to redirect http to https traffic on. If unset, no redirect server is started.

Policy

Environmental Variable: POLICY
Config File Key: policy
Type: base64 encoded string or inline policy structure in config file
Required

Policy contains route specific settings, and access control details. If you are configuring via POLICY environment variable, just the contents of the policy needs to be passed. If you are configuring via file, the policy should be present under the policy key. For example,

<<< @/config-policy-only.yaml

A list of policy configuration variables follows.

From

yaml/json setting: from
Type: string domain
Required
Example: httpbin.corp.example.com

From is externally accessible source of the proxied request.

To

yaml/json setting: to
Type: string domain
Required
Example: httpbin , 192.1.20.12:20, http://neverssl.com

To is the destination of a proxied request. It can be an internal resource, or an external resource.

Allowed Users

yaml/json setting: allowed_users
Type: collection of strings
Required
Example: alice@pomerium.io , bob@contractor.co

Allowed users is a collection of whitelisted users to authorize for a given route.

Allowed Groups

yaml/json setting: allowed_groups
Type: collection of strings
Required
Example: admins , support@company.com

Allowed groups is a collection of whitelisted groups to authorize for a given route.

Allowed Domains

yaml/json setting: allowed_domains
Type: collection of strings
Required
Example: pomerium.io , gmail.com

Allowed domains is a collection of whitelisted domains to authorize for a given route.

CORS Preflight

yaml/json setting: cors_allow_preflight
Type: bool
Optional
Default: false

Allow unauthenticated HTTP OPTIONS requests as per the CORS spec.

Public Access

yaml/json setting: allow_public_unauthenticated_access
Type: bool
Optional
Default: false

Use with caution: Allow all requests for a given route, bypassing authentication and authorization. Suitable for publicly exposed web services.

If this setting is enabled, no whitelists (e.g. Allowed Users) should be provided in this route.

Route Timeout

yaml/json setting: timeout
Type: Go Duration string
Optional
Default: 30s

Policy timeout establishes the per-route timeout value. Cannot exceed global timeout values.

Authenticate Service

Authenticate Service URL

Environmental Variable: AUTHENTICATE_SERVICE_URL
Config File Key: authenticate_service_url
Type: URL
Required
Example: https://authenticate.corp.example.com

Authenticate Service URL is the externally accessible URL for the authenticate service.

Identity Provider Name

Environmental Variable: IDP_PROVIDER
Config File Key: idp_provider
Type: string
Required
Options: azure google okta gitlab onelogin or oidc

Provider is the short-hand name of a built-in OpenID Connect (oidc) identity provider to be used for authentication. To use a generic provider,set to oidc.

See identity provider for details.

Identity Provider Client ID

Environmental Variable: IDP_CLIENT_ID
Config File Key: idp_client_id
Type: string
Required

Client ID is the OAuth 2.0 Client Identifier retrieved from your identity provider. See your identity provider's documentation, and our identity provider docs for details.

Identity Provider Client Secret

Environmental Variable: IDP_CLIENT_SECRET
Config File Key: idp_client_secret
Type: string
Required

Client Secret is the OAuth 2.0 Secret Identifier retrieved from your identity provider. See your identity provider's documentation, and our identity provider docs for details.

Identity Provider URL

Environmental Variable: IDP_PROVIDER_URL
Config File Key: idp_provider_url
Type: string
Required, depending on provider

Provider URL is the base path to an identity provider's OpenID connect discovery document. For example, google's URL would be https://accounts.google.com for their discover document.

Identity Provider Scopes

Environmental Variable: IDP_SCOPES
Config File Key: idp_scopes
Type: []string comma separated list of oauth scopes.
Default: oidc,profile, email, offline_access (typically)
Optional for built-in identity providers.

Identity provider scopes correspond to access privilege scopes as defined in Section 3.3 of OAuth 2.0 RFC6749. The scopes associated with Access Tokens determine what resources will be available when they are used to access OAuth 2.0 protected endpoints. If you are using a built-in provider, you probably don't want to set customized scopes.

Identity Provider Service Account

Environmental Variable: IDP_SERVICE_ACCOUNT
Config File Key: idp_service_account
Type: string
Required, depending on provider

Identity Provider Service Account is field used to configure any additional user account or access-token that may be required for querying additional user information during authentication. For a concrete example, Google an additional service account and to make a follow-up request to query a user's group membership. For more information, refer to the identity provider docs to see if your provider requires this setting.

Proxy Service

Signing Key

Environmental Variable: SIGNING_KEY
Config File Key: signing_key
Type: base64 encoded string
Optional

Signing key is the base64 encoded key used to sign outbound requests. For more information see the signed headers docs.

Authenticate Service URL

Environmental Variable: AUTHENTICATE_SERVICE_URL
Config File Key: authenticate_service_url
Type: URL
Required
Example: https://authenticate.corp.example.com

Authenticate Service URL is the externally accessible URL for the authenticate service.

Authenticate Internal Service URL

Environmental Variable: AUTHENTICATE_INTERNAL_URL
Config File Key: authenticate_internal_url
Type: string
Optional
Example: pomerium-authenticate-service.pomerium.svc.cluster.local

Authenticate Internal Service URL is the internally routed dns name of the authenticate service. This setting is typically used with load balancers that do not gRPC, thus allowing you to specify an internally accessible name.

Authorize Service URL

Environmental Variable: AUTHORIZE_SERVICE_URL
Config File Key: authorize_service_url
Type: URL
Required
Example: https://access.corp.example.com or pomerium-authorize-service.pomerium.svc.cluster.local

Authorize Service URL is the location of the internally accessible authorize service. NOTE: Unlike authenticate, authorize has no publicly accessible http handlers so this setting is purely for gRPC communication.

If your load balancer does not support gRPC pass-through you'll need to set this value to an internally routable location (pomerium-authorize-service.pomerium.svc.cluster.local) instead of an externally routable one (https://access.corp.example.com).

Override Certificate Name

Environmental Variable: OVERRIDE_CERTIFICATE_NAME
Config File Key: override_certificate_name
Type: int
Optional (but typically required if Authenticate Internal Service Address is set)
Example: *.corp.example.com if wild card or authenticate.corp.example.com/authorize.corp.example.com

When Authenticate Internal Service Address is set, secure service communication can fail because the external certificate name will not match the internally routed service url. This setting allows you to override that check.

Certificate Authority

Environmental Variable: CERTIFICATE_AUTHORITY or CERTIFICATE_AUTHORITY_FILE
Config File Key: certificate_authority or certificate_authority_file
Type: base64 encoded string or relative file location
Optional

Certificate Authority is set when behind-the-ingress service communication uses self-signed certificates. Be sure to include the intermediary certificate.

Headers

Environmental Variable: HEADERS
Config File Key: headers
Type: map of strings key value pairs
Example: X-Content-Type-Options:nosniff,X-Frame-Options:SAMEORIGIN
To disable: disable:true
Default :
```
X-Content-Type-Options : nosniff,
X-Frame-Options:SAMEORIGIN,
X-XSS-Protection:1; mode=block,
Strict-Transport-Security:max-age=31536000; includeSubDomains; preload,
```
Headers specifies a mapping of HTTP Header to be added to proxied requests. Nota bene Downstream application headers will be overwritten by Pomerium's headers on conflict.

By default, conservative secure HTTP headers are set.

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Configuration

Global settings

Service Mode

Address

Shared Secret

Debug

Log Level

Certificate

Certificate Key

Global Timeouts

HTTP Redirect Address

Policy

From

To

Allowed Users

Allowed Groups

Allowed Domains

CORS Preflight

Public Access

Route Timeout

Authenticate Service

Authenticate Service URL

Identity Provider Name

Identity Provider Client ID

Identity Provider Client Secret

Identity Provider URL

Identity Provider Scopes

Identity Provider Service Account

Proxy Service

Signing Key

Authenticate Service URL

Authenticate Internal Service URL

Authorize Service URL

Override Certificate Name

Certificate Authority

Headers

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