keeper/guacamole

Docker deployment of Apache Guacamole with Keeper Connection Manager

Image: keeper/guacamole

To activate advanced features of Keeper Connection Manager, you simply add an environmental variable to the docker file that controls the feature, or you add one of the EXTENSIONS flags as documented below.

Arbitrary third-party extensions may be used through volume mounts and setting ADDITIONAL_GUACAMOLE_PROPERTIES variables as needed.

Viewing the Guacamole logs

The Guacamole logs are useful if debugging unexpected behavior of the aspects of the web application which are not directly related to remote desktop, including authentication. To view the Tomcat/Guacamole logs follow the troubleshooting documentation.

By default, these logs will show messages only at the "info" level or above. This can be overridden when the container is created using the LOG_LEVEL environment variable.

Environment variables

`ACCEPT_EULA`

The ACCEPT_EULA environment variable must be set to "Y" to indicate your acceptance of the Keeper Connection Manager EULA. This Docker image may not be used except under the terms of the EULA.

`KCM_LICENSE`

The KCM_LICENSE environment variable contains the license key provided by Keeper support.

`ADDITIONAL_GUACAMOLE_PROPERTIES`

This variable is optional and specifies any additional content that should be appended to /etc/guacamole/guacamole.properties during startup. This content is added via guacamole.properties.docker, thus environment variable substitution will be automatically performed on the content of this variable.

`ALLOWED_LANGUAGES`

This variable is optional and restricts the display languages within Guacamole to the comma-separated list of language keys. If specified, only the listed languages will be made available to the user, and only the listed languages will be selected from automatically based on the user's browser's preferred language. For example, to restrict Guacamole to only English and German, specify ALLOWED_LANGUAGES="en, de". As English is the fallback language, used whenever a translation key is missing from the chosen language, English should only be omitted from this list if you are absolutely positive that no strings are missing from your custom translations.

By default, all defined languages will be available.

`API_*`

All environment variables which start with API_ correspond to configuration properties for configuring the Guacamole web application as a whole. These variables control how Guacamole handles user sessions and any HTTP requests that it receives. Note that these variables control only aspects of the Guacamole web application. They do not control the behavior of remote desktop sessions.

Variable name

Description

API_MAX_REQUEST_SIZE

The maximum number of bytes to accept within the entity body of any particular HTTP request to the REST API, including authentication requests. This limit does not apply to files transferred within a remote desktop session. Specifying 0 disables request size limitations. By default, requests are limited to 2097152 bytes (2 MB).

API_SESSION_TIMEOUT

The amount of time, in minutes, a Guacamole session may remain valid despite being inactive. By default, Guacamole sessions are limited to one hour.

This setting affects Guacamole sessions only, not remote desktop sessions. To enforce limits on the duration of remote desktop sessions, you must change the relevant setting within your remote desktop server, such as the session time limit GPOs provided by the Windows RDP server. Guacamole considers a connected remote desktop session to be user activity, and does not attempt to define what constitutes an idle but connected remote desktop session.

`AWS_DISCOVERY_*`

All environment variables which start with AWS_DISCOVERY_ correspond to configuration properties for AWS EC2 discovery which would normally be specified within guacamole.properties.

The following environment variables are required if using EC2 discovery:

Variable name

Description

AWS_DISCOVERY_ACCESS_KEY_ID

The access key ID for the AWS account that should be used to authenticate with AWS.

AWS_DISCOVERY_SECRET_KEY

The secret key associated with the access key

AWS_DISCOVERY_REGIONS

Comma-separated list of regions to query for EC2 instances, such as us-west-1,us-east-1.

Other, optional environment variables are available for the other properties related to EC2 discovery:

Variable name

Description

AWS_DISCOVERY_INSTANCE_BASE_PATH

The name of the organizational connection group that should be used to house the EC2 instances for convenience. By default, this will be "Amazon EC2".

AWS_DISCOVERY_ADMIN_GROUP

The name of the User Group in Keeper Connection Manager to require for any user to see the discovered EC2 instances. By default, this will be a group called "AWS EC2 Administrators".

AWS_DISCOVERY_RECORD_CONNECTIONS_BY_DEFAULT

If set to "true", screen recording will be enabled by default on all connections. Connection session recording can also be set at an individual machine level using the "kcm:record" EC2 instance tag, which overrides the value set here, if any.

AWS_DISCOVERY_KSM_CONFIG

The base64-encoded Keeper Secrets Manager configuration to use to retrieve the private keys for EC2 instances from the Keeper vault.

AWS_DISCOVERY_KSM_API_CALL_INTERVAL

The minimum number of milliseconds that must elapse between API calls to Keeper Secrets Manager. By default, KCM will wait 10 seconds between each call, using cached data from the last retrieval until another retrieval attempt is allowed.

`BAN_*`

All environment variables which start with BAN_ correspond to configuration properties for configuring how apparent brute-force authentication attempts against the web application are automatically blocked. Each of these variables is optional.

Variable name

BAN_ADDRESS_DURATION

The amount of time an IP address is temporarily blocked after repeatedly failing to authenticate, in seconds. By default, addresses are blocked for 5 minutes.

BAN_MAX_ADDRESSES

The maximum number of IP addresses that KCM will track to check for invalid attempts. By default, up to 10485760 addresses will be tracked.

BAN_MAX_INVALID_ATTEMPTS

The number of invalid attempts that may occur before the source IP address is temporarily blocked from further attempts. By default, 5 failed authentication attempts will result in a temporary block.

`CA_CERTIFICATES`

This variable is optional and specifies the contents of one or more certificates used by your internal certificate authority (CA), in PEM form. When specified, SSL/TLS connections to other servers will be verified against these certificates, including connections to LDAP servers that use SSL/TLS.

`CATALINA_OPTS`

This variable is optional and specifies arbitrary command-line options that should be passed to the JVM running Tomcat. It corresponds to Tomcat's own CATALINA_OPTS environment variable and is primarily used to pass additional system properties to the JVM, as may be necessary to configure platform-level options like whether an HTTP proxy should be used.

For example, if you wish to ensure that all outbound HTTPS connections go through an HTTP proxy, including API calls to services like Keeper Secrets Manager (KSM), you would set CATALINA_OPTS to:

-Dhttps.proxyHost=my.proxy -Dhttps.proxyPort=3129

where "my.proxy" is the hostname or IP address of the desired HTTP proxy and "3129" is its TCP port number.

`CONTEXT_PATH`

This variable is optional and specifies the path that the Guacamole web application should be served under. By default, the web application will be served at the root directory (http://your-container:8080/), but this can be overridden by setting CONTEXT_PATH to the name of a different location.

Note that the location specified with CONTEXT_PATH may not contain slashes. If you need to serve the web application beneath a more complex nested path, you will need to use a reverse proxy like Nginx or Apache HTTPD.

`DUO_*`

The following environment variables are required if using Duo multi-factor authentication:

Environment Variable

Description

DUO_API_HOSTNAME

REQUIRED. The hostname of the Duo API endpoint that will be used to verify user identities, assigned by Duo when Guacamole was added as a "Web SDK" application. This value can be found within the application details in Duo's "Admin" panel.

DUO_AUTH_TIMEOUT

The timeout, in minutes, for in-progress Duo authentication attempts. Authentication attempts exceeding this duration will be invalidated. By default, Duo authentication attempts will time out after 5 minutes.

DUO_CLIENT_ID

REQUIRED. The client ID provided for you by Duo when KCM was added as a "Web SDK" application. This value can be found within the application details in Duo's "Admin" panel.

DUO_CLIENT_SECRET

REQUIRED. The client secret provided for you by Duo when KCM was added as a "Web SDK" application. This value can be found within the application details in Duo's "Admin" panel.

DUO_REDIRECT_URI

REQUIRED. The user-facing URI that the Duo service can use to redirect an authenticated user's browser back to KCM. This is the URI that you use for the KCM deployment, e.g. https://kcm.company.com

`EXTENSIONS`

This variable is optional and specifies a comma- or newline-separated list of the names of all extensions that should be activated in the image, regardless of which other environment variables may be specified. Empty names, whitespace, and trailing commas are ignored.

Extension names are dictated by the guacamole(*) package capability of the corresponding Keeper Connection Manager package (part of the RPM package's metadata):

Extension name

Declared capability

Corresponding package

duo

guacamole(duo)

kcm-guacamole-auth-duo

json

guacamole(json)

kcm-guacamole-auth-json

ldap

guacamole(ldap)

kcm-guacamole-auth-ldap

mysql

guacamole(mysql)

kcm-guacamole-auth-jdbc-mysql

openid

guacamole(openid)

kcm-guacamole-auth-sso-openid

postgresql

guacamole(postgresql)

kcm-guacamole-auth-jdbc-postgresql

saml

guacamole(saml)

kcm-guacamole-auth-sso-saml

sqlserver

guacamole(sqlserver)

kcm-guacamole-auth-jdbc-sqlserver

ssl

guacamole(ssl)

kcm-guacamole-auth-sso-ssl

totp

guacamole(totp)

kcm-guacamole-auth-totp

uds

guacamole(uds)

kcm-guacamole-auth-uds

This variable is mainly of use for extensions which can be used without setting any configuration options, like TOTP two-factor authentication, or to force sanity checks on the presence of required environment variables even if all associated variables might be accidentally omitted. Extensions not listed within this environment variable will still be included if any of their corresponding environment variables are set.

`EXTENSION_PRIORITY`

This variable is optional and specifies the order that extensions should be loaded relative to each other. By default, extensions are loaded in alphabetical order based on their filenames.

To override the load order of extensions, list the names of each extension that should be loaded first, separated by commas. The special name * may be used as a placeholder for all other extensions. For example:

Description

Value of EXTENSION_PRIORITY

Force SAML to take priority over all other extensions.

saml

Force all other extensions to take priority over SAML.

*, saml

Prefer LDAP over any other authentication method, and force all other extensions to take priority over SAML and OpenID.

ldap, *, saml, openid

`GUACD_*`

TCP connection information for guacd.

Variable name

Description

GUACD_HOSTNAME

The hostname of the machine hosting the guacd service.

Other, optional environment variables are available for configuring other aspects of the connection to guacd:

Variable name

Description

GUACD_PORT

The port used by the guacd service.

GUACD_SSL

Whether the guacd service has been configured for SSL/TLS.

`JSON_*`

All environment variables which start with JSON_ correspond to configuration properties for encrypted JSON authentication which would normally be specified within guacamole.properties.

The following environment variables are required if using encrypted JSON authentication:

Variable name

Description

JSON_SECRET_KEY

The shared secret key that will be used by systems generating JSON data to encrypt and sign that data. This key must be 128 bits, specified with 32 hexadecimal digits.

Other, optional environment variables are available for the other properties related to encrypted JSON authentication:

Variable name

Description

JSON_TRUSTED_NETWORKS

A comma-separated list of trusted IP addresses and/or CIDR subnets which should be allowed to send encrypted JSON. If omitted, any address will be allowed to send JSON.

`KSM_*`

All environment variables which start with KSM_* correspond to configuration properties for Keeper Secrets Manager. See the Keeper Vault Integration guide.

Variable name

Description

KSM_ALLOW_USER_CONFIG

If set to "true", users will be allowed to provide their own KSM configuration or one-time token. Vault records of users that provide this will be additionally considered for any connection that (1) an administrator enables for use with user vaults and (2) contains a token that cannot be satisfied with a record from the system-wide vault configured with KSM_CONFIG. By default, users are not allowed to provide their own KSM configuration.

KSM_API_CALL_INTERVAL

KSM_CONFIG

The Keeper Secrets Manager b64 configuration, generated by Keeper Commander.

KSM_MATCH_DOMAINS_FOR_USERS

If set to "true", Active Directory domains within KSM records and KCM connections will be considered when determining whether a record matches a username. By default, only the username itself is considered.

KSM_STRIP_WINDOWS_DOMAINS

If set to "true", Active Directory domains within KSM records will be alternatively determined by splitting the record username into username and domain components. Splitting is performed based on the User Principal Name and Down-Level Logon Name formats. By default, usernames are not split, and Windows domains will be read only from a separate "Domain" field on the record.

KSM_TOKEN_MAPPING

Static tokens used to identify specific Keeper vault records and fields.

*_KSM_SECRET

Used for protection and storage of configuration values in the Keeper vault.

`LDAP_*`

All environment variables which start with LDAP_ correspond to configuration properties for LDAP authentication which would normally be specified within guacamole.properties.

The following environment variables are required if using LDAP authentication (for a single LDAP server):

Variable name

Description

LDAP_HOSTNAME

The hostname or IP address of the LDAP server that Guacamole should use for authentication.

LDAP_USER_BASE_DN

The common base DN shared by all Guacamole users within the LDAP directory.

If using multiple LDAP servers, or if you prefer to provide LDAP server configuration in YAML format, the following environment variable is required:

Variable name

Description

LDAP_SERVERS

A list of LDAP servers in the proper yml format. Follow this guide.

Other, optional environment variables are available for the other properties related to LDAP authentication:

Variable name

Description

LDAP_PORT

The TCP port that the LDAP server is listening on. If omitted, the standard LDAP or LDAPS port will be used, depending on the encryption method. Unencrypted LDAP uses the standard port of 389, while LDAPS uses port 636.

LDAP_ENCRYPTION_METHOD

The encryption mechanism to use when communicating with your LDAP server, if any. Legal values are "none" for unencrypted LDAP, "ssl" for LDAP over SSL/TLS (commonly known as LDAPS), or "starttls" for STARTTLS. If omitted, encryption will not be used.

LDAP_NETWORK_TIMEOUT

The maximum amount of time to allow for any LDAP network operation, in milliseconds, including attempts to connect to the LDAP server. By default, LDAP network operations will time out after 30 seconds (30000 milliseconds). Note that this value is intentionally more granular than LDAP_OPERATION_TIMEOUT, as failover to alternative LDAP servers may need to occur quickly if multiple LDAP servers are configured.

LDAP_OPERATION_TIMEOUT

The maximum amount of time to allow for any LDAP query, in seconds. By default, LDAP queries will time out after 30 seconds.

LDAP_USERNAME_ATTRIBUTE

The attribute which contains the username within all relevant user objects in the LDAP directory. If multiple attributes may contain the username, multiple attributes may be specified separated by commas, and a search DN is required.

LDAP_SEARCH_BIND_DN

The DN that the web application should bind as when determining the DN of the user attempting to authenticate. Specifying a search DN is required if usernames may be within any one of several attributes, or if the user's username is not part of their DN.

LDAP_SEARCH_BIND_PASSWORD

The password to use when authenticating with the search DN.

LDAP_CONFIG_BASE_DN

The common base DN shared by all guacConfigGroup objects, if the LDAP directory is being used to store connection data.

LDAP_GROUP_BASE_DN

The common base DN shared by all user groups which may dictate guacConfigGroup access within the LDAP directory via the seeAlso attribute.

LDAP_MAX_SEARCH_RESULTS

The maximum number of results to attempt to retrieve from the LDAP directory for any particular search. Searches which exceed this limit will fail. By default, searches are limited to 1000 entries.

LDAP_USER_SEARCH_FILTER

The LDAP search filter to use when querying user accounts. If omitted, (objectClass=*) will be used by default.

LDAP_GROUP_SEARCH_FILTER

The LDAP search filter to use when retrieving groups. If omitted, (objectClass=*) will be used by default.

LDAP_DEREFERENCE_ALIASES

Whether aliases should be automatically dereferenced. Legal values are "never", "searching" (dereference only after the base DN is located), "finding" (dereference only when locating the base DN), and "always". By default, aliases are not derefenced.

LDAP_FOLLOW_REFERRALS

If "true", automatically follow referrals received from the LDAP directory. By default, LDAP referrals are not followed.

LDAP_MAX_REFERRAL_HOPS

The maximum number of referrals that may be followed when resolving any particular LDAP referral. By default, if LDAP automatic following of referrals is enabled, up to 5 hops are allowed for any one referral.

CA_CERTIFICATES

The contents of one or more certificates used by your internal certificate authority (CA), in PEM form. When specified, SSL/TLS connections to other servers will be verified against these certificates, including connections to LDAP servers that use SSL/TLS.

`LOG_LEVEL`

This variable is optional and specifies the lowest level of log message that should be displayed. In order of increasing verbosity, valid values are: "error", "warn", "info", "debug", "trace".

The default log level is "info".

`MYSQL_*`

All environment variables which start with MYSQL_ correspond to configuration properties for MySQL authentication which would normally be specified within guacamole.properties.

If intending to use MySQL, you may wish to use the keeper/guacamole-db-mysql image which provides a MySQL database that is automatically initialized for use by Guacamole.

The following environment variables are required if using MySQL authentication:

Variable name

Description

MYSQL_HOSTNAME

The hostname or IP address of the MySQL or MariaDB server hosting the Guacamole database.

MYSQL_DATABASE

The name of the database that has been created for Guacamole on the MySQL or MariaDB server.

MYSQL_USERNAME

The username that Guacamole should use when authenticating with the MySQL or MariaDB server.

MYSQL_PASSWORD

The password that Guacamole should provide when authenticating with the MySQL or MariaDB server.

Other, optional environment variables are available for the other properties related to MySQL authentication:

Variable name

Description

MYSQL_PORT

The TCP port that the MySQL or MariaDB server is listening on. If omitted, the standard MySQL port of 3306 will be used.

MYSQL_USER_PASSWORD_MIN_LENGTH

The minimum length to require for user passwords. By default, password complexity is not enforced.

MYSQL_USER_PASSWORD_REQUIRE_MULTIPLE_CASE

If set to "true", require that user passwords use both uppercase and lowercase characters.

MYSQL_USER_PASSWORD_REQUIRE_SYMBOL

If set to "true", require that user passwords contain at least one symbol. By default, password complexity is not enforced.

MYSQL_USER_PASSWORD_REQUIRE_DIGIT

If set to "true", require that user passwords contain at least one digit. By default, password complexity is not enforced.

MYSQL_USER_PASSWORD_PROHIBIT_USERNAME

If set to "true", disallow user passwords that contain the user's username. By default, password complexity is not enforced.

MYSQL_USER_PASSWORD_MIN_AGE

The minimum number of days that must elapse following a password change before the user may change their password again. By default, users are not required to wait before changing their password.

MYSQL_USER_PASSWORD_MAX_AGE

The maximum number of days that may elapse since the last password change before the user is required to change their password. By default, users are not required to regularly change their password.

MYSQL_USER_PASSWORD_HISTORY_SIZE

Remember this number of previous passwords and prohibit reuse of those passwords when the user's password is changed. By default, users are allowed to reuse previous passwords.

MYSQL_DEFAULT_MAX_CONNECTIONS

The maximum number of concurrent connections to allow to any particular connection, regardless of user, where a value of "0" indicates unlimited. By default, concurrent usage of connections is not limited.

MYSQL_DEFAULT_MAX_GROUP_CONNECTIONS

The maximum number of concurrent connections to allow to any particular connection group, regardless of user, where a value of "0" indicates unlimited. By default, concurrent usage of connection groups is not limited.

MYSQL_DEFAULT_MAX_CONNECTIONS_PER_USER

The maximum number of concurrent connections to allow each user to hold to any particular connection, where a value of "0" indicates unlimited. By default, user-specific concurrent usage of connections is not limited.

MYSQL_DEFAULT_MAX_GROUP_CONNECTIONS_PER_USER

The maximum number of concurrent connections to allow each user to hold to any particular connection group, where a value of "0" indicates unlimited. By default, user-specific concurrent usage of connection groups is limited to one.

MYSQL_ABSOLUTE_MAX_CONNECTIONS

The maximum number of concurrent connections to allow to overall, regardless of user, connection or connection group, where a value of "0" indicates unlimited. By default, overall concurrent usage is not limited.

MYSQL_USER_REQUIRED

If set to "true", require that each user have a corresponding account defined within the database, even if the user authenticated through some other mechanism (such as LDAP). By default, users that successfully authenticate through another mechanism are not required to also have an account within the database.

MYSQL_TRACK_EXTERNAL_CONNECTION_HISTORY

Whether connections that do not exist within the database should have connection history tracked in the database. If set to "true", connection history records will be created for any connection established. If set to "false", connection history records will be created only for connections defined in the database. By default, external connections will be tracked.

MYSQL_ENFORCE_ACCESS_WINDOWS_FOR_ACTIVE_SESSIONS

Whether access time restrictions imposed by the administrator on user accounts should be enforced while a user is logged in. If set to "true", users will be automatically logged out within roughly one minute of reaching their access time limits. If set to "false", access time restrictions will only be enforced at the moment a user attempts to log in. By default, access time restrictions are enforced while users are logged in.

MYSQL_AUTO_CREATE_ACCOUNTS

Whether user account entries should automatically be created within the database for users that successfully authenticate through other means, such as an SSO provider or LDAP. This may be necessary if using an extension that requires account-specific storage, like TOTP or per-account approvals. If set to "true", user account entries will automatically be created. By default, administrators must manually create such entries if needed.

`OPENID_*`

All environmental variables which start with OPENID_ correspond to configuration properties for Open ID Connect authentication which would normally be specified within guacamole.properties.

Variable Name

Description

OPENID_AUTHORIZATION_ENDPOINT

The authorization endpoint (URI) of the OpenID service. This value should be provided to you by the identity provider. For identity providers that implement OpenID Connect Discovery, this value can be retrieved from the "authorization_endpoint" property of your provider's ".well-known/openid-configuration" JSON file.

OPENID_CLIENT_ID

The OpenID client ID which should be submitted to the OpenID service when necessary. This value is typically provided to you by the OpenID service when OpenID credentials are generated for your application.

OPENID_ISSUER

The issuer to expect for all received ID tokens. This value should be provided to you by the identity provider. For identity providers that implement OpenID Connect Discovery, this value can be retrieved from the "issuer" property of your provider's

".well-known/openid-configuration" JSON file.

OPENID_JWKS_ENDPOINT

The endpoint (URI) of the JWKS service which defines how received ID tokens (JSON Web Tokens or JWTs) shall be validated. This value should be provided to you by the identity provider. For identity providers that

implement OpenID Connect Discovery, this value can be retrieved from the "jwks_uri" property of your provider's ".well-known/openid-configuration" JSON file.

OPENID_REDIRECT_URI

The URI that should be submitted to the OpenID service such that they can redirect the authenticated user back to Keeper Connection Manager after the authentication process is complete. This must be the full URL that a user would enter into their browser to access Keeper Connection Manager. The URI that should be submitted to the OpenID service such that they can redirect the authenticated user back to Keeper Connection Manager after the authentication process is complete. This must be the full URL that a user would enter into their browser to access Keeper Connection Manager.

Optional variables:

Variable Name

Description

OPENID_ALLOWED_CLOCK_SKEW

The amount of clock skew tolerated for timestamp comparisons between the Guacamole server and OpenID service clocks, in seconds. By default, clock skew of up to 30 seconds is tolerated.

OPENID_GROUPS_CLAIM_TYPE

The claim type within any valid JWT that contains the list of groups of which the authenticated user is a member. By default, the “groups” claim type is used.

OPENID_MAX_NONCE_VALIDITY

The maximum amount of time that a nonce generated by the Guacamole server should remain valid, in minutes. As each OpenID request has a unique nonce value, this imposes an upper limit on the amount of time any particular OpenID request can result in successful authentication within Guacamole. By default, each generated nonce expires after 10 minutes.

OPENID_MAX_TOKEN_VALIDITY

The maximum amount of time that an OpenID token should remain valid, in minutes. By default, each OpenID token remains valid for 300 minutes (5 hours).

OPENID_SCOPE

The space-separated list of OpenID scopes to request. OpenID scopes determine the information returned within the OpenID token, and thus affect what values can be used as an authenticated user’s username. To be compliant with OpenID, at least “openid profile” must be requested. By default, “openid email profile” is used.

OPENID_USERNAME_CLAIM_TYPE

The claim type within any valid JWT that contains the list of groups of which the authenticated user is a member. By default, the “groups” claim type is used.

`POSTGRES_*`

All environment variables which start with POSTGRES_ correspond to configuration properties for PostgreSQL authentication which would normally be specified within guacamole.properties.

If intending to use PostgreSQL, you may wish to use the keeper/guacamole-db-postgres image which provides a PostgreSQL database that is automatically initialized for use by Guacamole.

The following environment variables are required if using PostgreSQL authentication:

Variable name

Description

POSTGRES_HOSTNAME

The hostname or IP address of the PostgreSQL server hosting the Guacamole database.

POSTGRES_DATABASE

The name of the database that has been created for Guacamole on the PostgreSQL server.

POSTGRES_USERNAME

The username that Guacamole should use when authenticating with the PostgreSQL server.

POSTGRES_PASSWORD

The password that Guacamole should provide when authenticating with the PostgreSQL server.

Other, optional environment variables are available for the other properties related to PostgreSQL authentication:

Variable name

Description

POSTGRES_PORT

The TCP port that the PostgreSQL server is listening on. If omitted, the standard PostgreSQL port of 5432 will be used.

POSTGRES_USER_PASSWORD_MIN_LENGTH

The minimum length to require for user passwords. By default, password complexity is not enforced.

POSTGRES_USER_PASSWORD_REQUIRE_MULTIPLE_CASE

If set to "true", require that user passwords use both uppercase and lowercase characters.

POSTGRES_USER_PASSWORD_REQUIRE_SYMBOL

If set to "true", require that user passwords contain at least one symbol. By default, password complexity is not enforced.

POSTGRES_USER_PASSWORD_REQUIRE_DIGIT

If set to "true", require that user passwords contain at least one digit. By default, password complexity is not enforced.

POSTGRES_USER_PASSWORD_PROHIBIT_USERNAME

If set to "true", disallow user passwords that contain the user's username. By default, password complexity is not enforced.

POSTGRES_USER_PASSWORD_MIN_AGE

The minimum number of days that must elapse following a password change before the user may change their password again. By default, users are not required to wait before changing their password.

POSTGRES_USER_PASSWORD_MAX_AGE

The maximum number of days that may elapse since the last password change before the user is required to change their password. By default, users are not required to regularly change their password.

POSTGRES_USER_PASSWORD_HISTORY_SIZE

Remember this number of previous passwords and prohibit reuse of those passwords when the user's password is changed. By default, users are allowed to reuse previous passwords.

POSTGRES_DEFAULT_MAX_CONNECTIONS

POSTGRES_DEFAULT_MAX_GROUP_CONNECTIONS

POSTGRES_DEFAULT_MAX_CONNECTIONS_PER_USER

POSTGRES_DEFAULT_MAX_GROUP_CONNECTIONS_PER_USER

POSTGRES_ABSOLUTE_MAX_CONNECTIONS

POSTGRES_USER_REQUIRED

POSTGRESQL_TRACK_EXTERNAL_CONNECTION_HISTORY

POSTGRESQL_ENFORCE_ACCESS_WINDOWS_FOR_ACTIVE_SESSIONS

POSTGRESQL_AUTO_CREATE_ACCOUNTS

`REQUIRE_ACCOUNT_APPROVAL`

This variable is optional and specifies the extensions that should require explicit approval from an administrator on a per-account basis before they can be used to authenticate a user. By default, any installed authentication method may be used.

To require approval for particular authentication methods, list the names of each extension that should require approval, separated by commas. For example:

Description

Value of REQUIRE_ACCOUNT_APPROVAL

Require approval for logins from SAML.

saml

Require approval for logins from SAML and LDAP.

saml, ldap

Account approval status can only be stored and enforced on users with identities in the KCM database. Depending on which database you are using, you can request that KCM automatically create this storage for accounts that do not yet exist within the database by setting one of the following environment variables to "true":

`SAML_*`

All environment variables which start with SAML_ correspond to configuration properties for SAML Authentication which would normally be specified within guacamole.properties.

The following environment variables are required if using SAML authentication:

Variable Name

Description

SAML_CALLBACK_URL

The URI that should be submitted to the SAML service such that they can POST the authentication result to Keeper Connection Manager and redirect the user back to the application. This must be the full URL that a user would enter into their browser to access Keeper Connection Manager.

Optional environmental variables:

Variable Name

Description

SAML_COMPRESS_REQUEST

Enable compression of the HTTP requests sent to the SAML IdP. This property is optional and will default to true (compression enabled).

SAML_COMPRESS_RESPONSE

Request that the SAML response returned by the IdP be compressed. This property is optional and will default to true (compression will be requested).

SAML_ENTITY_ID

The entity ID of the Guacamole SAML client, which is generally the URL of the Guacamole server, but is not required to be so. This property is required if either the saml-idp-metadata-url property is not specified, or if the provided metadata file does not contain the SAML SP Entity ID for Guacamole Client.

SAML_GROUP_ATTRIBUTE

The name of the attribute provided by the SAML IdP that contains group membership of the user. These groups will be parsed and used to map group membership of the user logging in, which can be used for permissions management within Guacamole Client, particularly when layered with other authentication modules. This property is optional, and defaults to “groups”.

SAML_IDP_METADATA_URL

The URI of the XML metadata file that from the SAML Identity Provider that contains all of the information the SAML extension needs in order to know how to authenticate with the IdP. This URI can either be a remote server (e.g. https://) or a local file on the filesystem (e.g. file://). Often the metadata file contains most of the required properties for SAML authentication and the other parameters are not required.

SAML_IDP_URL

The base URL of the SAML IdP. This is the URL that the SAML authentication extension will use to redirect when requesting SAML authentication. If the saml-idp-metadata-url property is provided, this parameter will be ignored. If the metadata file is not provided this property is required.

SAML_PRIVATE_KEY_PATH

The full path of the private key in PEM format that should be used to sign SAML requests submitted to the SAML IdP. This is required only if the SAML IdP requires signed requests. By default, SAML requests are not signed.

SAML_X509_CERT_PATH

The full path of the X.509 certificate in PEM format that should be used to sign SAML requests submitted to the SAML IdP. This is required only if the SAML IdP requires signed requests. By default, SAML requests are not signed.

`SQLSERVER_*`

All environment variables which start with SQLSERVER_ correspond to configuration properties for SQL Server authentication which would normally be specified within guacamole.properties.

The following environment variables are required if using SQL Server authentication:

Variable name

Description

SQLSERVER_HOSTNAME

The hostname or IP address of the SQL Server instance hosting the Guacamole database.

SQLSERVER_DATABASE

The name of the database that has been created for Guacamole on the SQL Server instance.

SQLSERVER_USERNAME

The username that Guacamole should use when authenticating with the SQL Server instance.

SQLSERVER_PASSWORD

The password that Guacamole should provide when authenticating with the SQL Server instance.

Other, optional environment variables are available for the other properties related to SQL Server authentication:

Variable name

Description

SQLSERVER_PORT

The TCP port that the SQL Server instance is listening on. If omitted, the standard SQL Server port of 1433 will be used.

SQLSERVER_USER_PASSWORD_MIN_LENGTH

The minimum length to require for user passwords. By default, password complexity is not enforced.

SQLSERVER_USER_PASSWORD_REQUIRE_MULTIPLE_CASE

If set to "true", require that user passwords use both uppercase and lowercase characters.

SQLSERVER_USER_PASSWORD_REQUIRE_SYMBOL

If set to "true", require that user passwords contain at least one symbol. By default, password complexity is not enforced.

SQLSERVER_USER_PASSWORD_REQUIRE_DIGIT

If set to "true", require that user passwords contain at least one digit. By default, password complexity is not enforced.

SQLSERVER_USER_PASSWORD_PROHIBIT_USERNAME

If set to "true", disallow user passwords that contain the user's username. By default, password complexity is not enforced.

SQLSERVER_USER_PASSWORD_MIN_AGE

The minimum number of days that must elapse following a password change before the user may change their password again. By default, users are not required to wait before changing their password.

SQLSERVER_USER_PASSWORD_MAX_AGE

The maximum number of days that may elapse since the last password change before the user is required to change their password. By default, users are not required to regularly change their password.

SQLSERVER_USER_PASSWORD_HISTORY_SIZE

Remember this number of previous passwords and prohibit reuse of those passwords when the user's password is changed. By default, users are allowed to reuse previous passwords.

SQLSERVER_DEFAULT_MAX_CONNECTIONS

SQLSERVER_DEFAULT_MAX_GROUP_CONNECTIONS

SQLSERVER_DEFAULT_MAX_CONNECTIONS_PER_USER

SQLSERVER_DEFAULT_MAX_GROUP_CONNECTIONS_PER_USER

SQLSERVER_ABSOLUTE_MAX_CONNECTIONS

SQLSERVER_USER_REQUIRED

SQLSERVER_TRACK_EXTERNAL_CONNECTION_HISTORY

SQLSERVER_ENFORCE_ACCESS_WINDOWS_FOR_ACTIVE_SESSIONS

SQLSERVER_AUTO_CREATE_ACCOUNTS

`SSL_*`

All environment variables which start with SSL_ correspond to configuration properties for SSL/TLS client authentication (smart card authentication) which would normally be specified within guacamole.properties.

The following environment variables are required if using SSL/TLS client authentication:

Variable name

Description

SSL_CLIENT_AUTH_URI

A wildcard URI that points to this Guacamole instance and requests SSL/TLS client authentication.

SSL_PRIMARY_URI

A non-wildcard URI that points to this Guacamole instance and does not request SSL/TLS client authentication.

Other, optional environment variables are available for the other properties related to SSL/TLS client authentication:

Variable name

Description

SSL_CLIENT_CERTIFICATE_HEADER

The name of the header to use to retrieve the URL-encoded client certificate from an HTTP request received from an SSL termination service providing SSL/TLS client authentication. By default, X-Client-Certificate is used, matching the behavior of the keeper/guacamole-ssl-nginx image.

SSL_CLIENT_VERIFIED_HEADER

The name of the header to use to retrieve the verification status of the certificate an HTTP request received from an SSL termination service providing SSL/TLS client authentication. This value of this header must be "SUCCESS" (all uppercase) if the certificate was successfully verified. By default, X-Client-Verified is used, matching the behavior of the keeper/guacamole-ssl-nginx image.

SSL_MAX_DOMAIN_VALIDITY

The amount of time that the temporary, unique subdomain generated for SSL/TLS authentication may remain valid, in minutes. By default, temporary subdomains are valid for 5 minutes.

SSL_MAX_TOKEN_VALIDITY

The amount of time that a temporary authentication token for SSL/TLS authentication may remain valid, in minutes. By default, temporary authentication tokens are valid for 5 minutes.

SSL_SUBJECT_BASE_DN

The base DN containing all valid subject DNs. If specified, only certificates asserting subject DNs beneath this base DN will be accepted. By default, all DNs are accepted as long as the certificate is valid.

SSL_SUBJECT_USERNAME_ATTRIBUTE

The LDAP attribute or attributes that may be used to represent a username within the subject DN of a user's X.509 certificate. If the least-significant attribute of the subject DN is not one of these attributes, the certificate will be rejected. By default, any attribute is accepted and used as the username.

`TOTP_*`

All environment variables which start with TOTP_ correspond to configuration properties for TOTP multi-factor authentication which would normally be specified within guacamole.properties.

Variable name

Description

TOTP_ISSUER

The human-readable name of the entity issuing user accounts. By default, this is "Apache Guacamole".

TOTP_DIGITS

The number of digits which should be included in each generated code. TOTP allows for 6-, 7-, or 8-digit codes. Longer or shorter codes than this are not possible as they violate the TOTP standard. By default, 6-digit codes will be used.

TOTP_PERIOD

The duration that each generated code should remain valid, in seconds. The code generation period is given in positive integer seconds and may be any value, however the value should be long enough to allow the user a reasonable amount of time to enter their code. Their authentication device will generate a new code after this period elapses. By default, generated codes are valid for 30 seconds.

TOTP_MODE

The hash algorithm that should be used to generate codes. Valid TOTP modes (hashes) are "sha1", "sha256", and "sha512". By default, "sha1" is used.

`UDS_*`

All environment variables which start with UDS_ correspond to configuration properties for integrating with UDS Enterprise that would normally be specified within guacamole.properties.

Variable name

Description

UDS_BASE_URL

The base URL of the UDS Enterprise deployment that may leverage Keeper Connection Manager to provide remote access. Keeper Connection Manager will use this URL to contact UDS to authenticate and authorize connection requests.

`USER_MAPPING`

This variable is optional and specifies the full contents of the /etc/guacamole/user-mapping.xml file that can be used to test a Guacamole deployment without configuring a more complex authentication method like MySQL, PostgreSQL, or LDAP. This is the authentication mechanism described within the Keeper Connection Manager installation instructions.

As the contents of this file are inherently sensitive, the file will be stored purely in memory (within /dev/shm) unless the USE_SHM environment variable is set to "N" as documented below.

`USE_DEFAULT_BRANDING`

Keeper Connection Manager ships with its own default branding. If you will be using your own custom branding, the optional USE_DEFAULT_BRANDING environment variable should be set to "N" to disable the Keeper branding and avoid conflicts with your branding extension.

`USE_SHM`

This variable is optional and may be used to force storage of known sensitive files on disk rather than in memory. To force storage to disk, set USE_SHM to "N".

By default, the keeper/guacamole image stores the contents of files that are known to be sensitive within /dev/shm, thus storing those files only in memory and without potentially persisting sensitive data to disk. As such files are generated by the Docker image from environment variables during startup, this is particularly useful if Docker secrets are being used.

Docker secrets

Rather than pass data directly in environment variables, a _FILE suffix may be added to any environment variable supported by this image to force that variable to be read from the named file within the container. For example, to read /etc/guacamole/user-mapping.xml from a file:

docker run --name some-guacamole \
    -e ACCEPT_EULA=Y \
    -e GUACD_HOSTNAME=some-guacd \
    -e USER_MAPPING_FILE=/some/volume/mount/user-mapping.xml \
    -d keeper/guacamole

As Docker secrets store sensitive data within files beneath /run/secrets/ within the container, this can be used to load sensitive data from Docker secrets:

docker run --name some-guacamole \
    -e ACCEPT_EULA=Y \
    -e GUACD_HOSTNAME=some-guacd \
    -e MYSQL_HOSTNAME=some-mysql \
    -e MYSQL_DATABASE=guacamole_db \
    -e MYSQL_USERNAME_FILE=/run/secrets/mysql-username \
    -e MYSQL_PASSWORD_FILE=/run/secrets/mysql-password \
    -d keeper/guacamole

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