Commit Graph

76 Commits (a004164bc377bee8c32412f180bb100d17870e8f)

Author SHA1 Message Date
James Elliott fcfff9748c
feat(handlers): synology password complexity err on reset (#2083)
This responds to the client with the correct error when used with Synology LDAP servers.
2021-06-16 12:50:14 +10:00
James Elliott cef35fadcd
feat(configuration): add error and warn log levels (#2050)
This is so levels like warn and error can be used to exclude info or warn messages. Additionally there is a reasonable refactoring of logging moving the log config options to the logging key because there are a significant number of log options now. This also decouples the expvars and pprof handlers from the log level, and they are now configured by server.enable_expvars and server.enable_pprof at any logging level.
2021-06-01 14:09:50 +10:00
James Elliott c62dbd43d6
fix(handlers): align response status codes for the verify endpoint (#2016)
This aligns all response status codes on the /api/verify endpoint when an error occurs, making it impossible to determine the actual reason for the failure.
2021-05-21 14:03:44 +02:00
James Elliott 46c8a25c15
fix(oidc): implement required subject types supported meta (#1996)
The well known openid-configuration should have the subject_types_supported meta values.
2021-05-11 11:00:29 +10:00
James Elliott c0ac8bf5ad
fix: include the jwk key id in the jwt for validation (#1983)
This is so the sig key used to sign the JWT can be verified using the JWKS endpoint.

Fixes #1979
2021-05-07 11:59:39 +10:00
James Elliott ddea31193b
feature(oidc): add support for OpenID Connect
OpenID connect has become a standard when it comes to authentication and
in order to fix a security concern around forwarding authentication and authorization information
it has been decided to add support for it.

This feature is in beta version and only enabled when there is a configuration for it.
Before enabling it in production, please consider that it's in beta with potential bugs and that there
are several production critical features still missing such as all OIDC related data is stored in
configuration or memory. This means you are potentially going to experience issues with HA
deployments, or when restarting a single instance specifically related to OIDC.

We are still working on adding the remaining set of features before making it GA as soon as possible.

Related to #189

Co-authored-by: Clement Michaud <clement.michaud34@gmail.com>
2021-05-05 00:15:36 +02:00
James Elliott cc4f47f21c
fix: removed deprecated smtp/ldap options (#1912)
This removes the deprecated options from 4.25. This includes the LDAP filters which allow {0} or {1} placeholders. The new aliases are documented. Additionally it refactors the keys validator to use uniform messages for most replaced keys.
2021-04-16 11:44:37 +10:00
James Elliott f0cb75e1e1
fix(handlers): logout redirection validation (#1908) 2021-04-13 10:38:12 +02:00
James Elliott 08e674b62f
docs: refactor several areas of documentation (#1726)
Updated all links to use https://www.authelia.com/docs/.
Removed all comment sections from documented configuration on the documentation site and replaced them with their own sections.
Made all documentation inside config.template.yml double hashes, and made all commented configuration sections single quoted.
Added .yamllint.yaml to express our desired YAML styles.
Added a style guide.
Refactored many documentation areas to be 120 char widths where possible. It's by no means exhaustive but is a large start.
Added a statelessness guide for the pending Kubernetes chart introduction.
Added labels to configuration documentation and made many areas uniform.
2021-04-11 21:25:03 +10:00
James Elliott 391c8671e9
fix(handlers): log user as '<anonymous>' instead of a blank string (#1808) 2021-03-13 15:52:07 +11:00
James Elliott e041143f87
feat(session): add redis sentinel provider (#1768)
* feat(session): add redis sentinel provider

* refactor(session): use int for ports as per go standards

* refactor(configuration): adjust tests and validation

* refactor(configuration): add err format consts

* refactor(configuration): explicitly map redis structs

* refactor(session): merge redis/redis sentinel providers

* refactor(session): add additional checks to redis providers

* feat(session): add redis cluster provider

* fix: update config for new values

* fix: provide nil certpool to affected tests/mocks

* test: add additional tests to cover uncovered code

* docs: expand explanation of host and nodes relation for redis

* ci: add redis-sentinel to suite highavailability, add redis-sentinel quorum

* fix(session): sentinel password

* test: use redis alpine library image for redis sentinel, use expose instead of ports, use redis ip, adjust redis ip range, adjust redis config

* test: make entrypoint.sh executable, fix entrypoint.sh if/elif

* test: add redis failover tests

* test: defer docker start, adjust sleep, attempt logout before login, attempt visit before login and tune timeouts, add additional logging

* test: add sentinel integration test

* test: add secondary node failure to tests, fix password usage, bump test timeout, add sleep

* feat: use sentinel failover cluster

* fix: renamed addrs to sentineladdrs upstream

* test(session): sentinel failover

* test: add redis standard back into testing

* test: move redis standalone test to traefik2

* fix/docs: apply suggestions from code review
2021-03-10 10:03:05 +11:00
James Elliott 4dce8f9496
perf(authorizer): preload access control lists (#1640)
* adjust session refresh to always occur (for disabled users)

* feat: adds filtering option for Request Method in ACL's

* simplify flow of internal/authorization/authorizer.go's methods

* implement query string checking

* utilize authorizer.Object fully

* make matchers uniform

* add tests

* add missing request methods

* add frontend enhancements to handle request method

* add request method to 1FA Handler Suite

* add internal ACL representations (preparsing)

* expand on access_control next

* add docs

* remove unnecessary slice for network names and instead just use a plain string

* add warning for ineffectual bypass policy (due to subjects)

* add user/group wildcard support

* fix(authorization): allow subject rules to match anonymous users

* feat(api): add new params

* docs(api): wording adjustments

* test: add request method into testing and proxy docs

* test: add several checks and refactor schema validation for ACL

* test: add integration test for methods acl

* refactor: apply suggestions from code review

* docs(authorization): update description
2021-03-05 15:18:31 +11:00
ThinkChaos ba65a3db82
feat(handlers): authorization header switch via query param to /api/verify (#1563)
* [FEATURE] Add auth query param to /api/verify (#1353)

When `/api/verify` is called with `?auth=basic`, use the standard
Authorization header instead of Proxy-Authorization.

* [FIX] Better basic auth error reporting

* [FIX] Return 401 when using basic auth instead of redirecting

* [TESTS] Add tests for auth=basic query param

* [DOCS] Mention auth=basic argument and provide nginx example

* docs: add/adjust basic auth query arg docs for proxies

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
2021-02-24 10:35:04 +11:00
James Elliott 60ff16b518
fix(handlers): refresh user details on all domains (#1642)
* fix(handlers): refresh user details on all domains 

* previously sessions only got checked for updated details if the domain had group subjects attached
* this meant disabled or deleted accounts did not get detected until the session expired or the user visited a domain protected by a group subject
* this patch fixes this issue and simplifies some logic surrounding the check

* add tests

simplify IsStringSlicesDifferent so it only iterates once

* add another test for IsStringSlicesDifferent
2021-02-02 12:01:46 +11:00
Amir Zarrinkafsh b989c1b169
[MISC] Refactor and address most errcheck linter ignores (#1511)
* [MISC] Refactor and address most errcheck linter ignores

This is mostly a quality of life change.
When we first implemented the errcheck linter we ignored a number of items in our legacy codebase with intent to revisit down the track.

* Handle errors for regulation marks and remove unnecessary logging
2020-12-16 12:47:31 +11:00
Amir Zarrinkafsh 7c6a86882f
[MISC] Catch OpenLDAP ppolicy error (#1508)
* [MISC] Catch OpenLDAP ppolicy error

Further to the discussion over at #361, this change now ensures that OpenLDAP password complexity errors are caught and appropriately handled.

This change also includes the PasswordComplexity test suite in the LDAP integration suite. This is because a ppolicy has been setup and enforced.

* Remove password history for integration tests

* Adjust max failures due to regulation trigger

* Fix error handling for password resets

* Refactor and include code suggestions
2020-12-16 12:30:03 +11:00
James Elliott 365304a684
[FEATURE] Add Optional Check for Session Username on VerifyGet (#1427)
* Adding the Session-Username header to the /api/verify endpoint when using cookie auth will check the value stored in the session store for the username and the header value are the same.
* use strings.EqualFold to compare case insensitively
* add docs
* add unit tests
* invalidate session if it is theoretically hijacked and log it as a warning (can only be determined if the header doesn't match the cookie)
* add example PAM script
* go mod tidy
* go mod bump to 1.15
2020-12-02 10:03:44 +11:00
Amir Zarrinkafsh aa64d0c4e5
[FEATURE] Support MSAD password reset via unicodePwd attribute (#1460)
* Added `ActiveDirectory` suite for integration tests with Samba AD
* Updated documentation
* Minor styling refactor to suites
* Clean up LDAP user provisioning
* Fix Authelia home splash to reference correct link for webmail
* Add notification message for password complexity errors
* Add password complexity integration test
* Rename implementation default from rfc to custom
* add specific defaults for LDAP (activedirectory implementation)
* add docs to show the new defaults
* add docs explaining the importance of users filter
* add tests
* update instances of LDAP implementation names to use the new consts where applicable
* made the 'custom' case in the UpdatePassword method for the implementation switch the default case instead
* update config examples due to the new defaults
* apply changes from code review
* replace schema default name from MSAD to ActiveDirectory for consistency
* fix missing default for username_attribute
* replace test raising on empty username attribute with not raising on empty

Co-authored-by: James Elliott <james-d-elliott@users.noreply.github.com>
2020-11-27 20:59:22 +11:00
Amir Zarrinkafsh f1ecc5b82a
[FEATURE] Create dedicated health endpoint (#1489)
This change points the Docker containers healthcheck to the dedicated `/api/health` endpoint and also includes support for Authelia running with a path prefix.
2020-11-25 10:20:52 +11:00
Amir Zarrinkafsh 50df949520
[BUGFIX] Prevent crash when email has not been set (#1466)
* [BUGFIX] Prevent crash when email has not been set

a83ccd7188 introduced a regression where if a misconfigured deployment presented an empty emails array setting `Remote-*` headers would fail.

If the emails array is empty we now set the `Remote-Email` header to an empty string.

* Add additional case for unit tests
2020-11-16 22:22:16 +11:00
Amir Zarrinkafsh a83ccd7188
[FEATURE] Add Remote-Name and Remote-Email headers (#1402) 2020-10-26 22:38:08 +11:00
Amir Zarrinkafsh b1a01b1727
[CI] Update QEMU to v5.1.0-2 (#1321)
* [CI] Update QEMU to v5.1.0-2

* Fix linter errors from golangci-lint update
2020-09-18 22:05:43 +10:00
Amir Zarrinkafsh 3c861922a6
[MISC] Address errors from linter updates (#1308) 2020-09-04 13:20:17 +10:00
Shawn Haggard 307f321e02
[MISC] Fixed typo in X-Forwarded headers (#1280) 2020-08-21 11:15:20 +10:00
Amir Zarrinkafsh 29e54c231b
[MISC] Template global config and refactor some /api endpoints (#1135)
* [MISC] Template global config and refactor some /api endpoints
* /api/configuration has been removed in favour of templating said global config
* /api/configuration/extended has been renamed to /api/configuration and display_name has been removed
* /api/user/info has been modified to include display_name

Co-authored-by: Clement Michaud <clement.michaud34@gmail.com>
2020-06-21 15:40:37 +02:00
Amir Zarrinkafsh e43bc93047
[FEATURE] Add configurable display name to frontend (#1124)
* [FEATURE] Add configurable display name to frontend
This feature allows users with a LDAP backend to specify an attribute (default is "displayname") to retrieve a users name for the portal greeting.
Similarly for the file based backend a new required key "name" has been introduced.

This can also be used down the line with OIDC as a separate scope.

* Update references from Name to DisplayName
* Update compose bundles to include displayname refs
* Update LDAP automatic profile refresh
* Ensure display name is updated
* Fix bug which prevented trace logging for profile refresh to not trigger
2020-06-19 20:50:21 +10:00
Amir Zarrinkafsh 24c2375b21
[MISC] Fix unit tests for Go 1.14+ (#1075)
Due to a [change in net/url](https://golang.org/doc/go1.14#net/url) tests need to be adjusted:

When parsing of a URL fails (for example by Parse or ParseRequestURI), the resulting Error message will now quote the unparsable URL. This provides clearer structure and consistency with other parsing errors.
2020-06-02 19:09:13 +10:00
James Elliott 469daedd36
[FEATURE] Delay 1FA Authentication (#993)
* adaptively delay 1FA by the actual execution time of authentication
* should grow and shrink over time as successful attempts are made
* uses the average of the last 10 successful attempts to calculate
* starts at an average of 1000ms
* minimum is 250ms
* a random delay is added to the largest of avg or minimum
* the random delay is between 0ms and 85ms
* bump LDAP suite to 80s timeout
* bump regulation scenario to 45s
* add mutex locking
* amend logging
* add docs
* add tests

Co-authored-by: Clément Michaud <clement.michaud34@gmail.com>
2020-05-21 00:03:15 +02:00
James Elliott a4cf2e675f
[DEPRECATE] Remove Google Analytics (#1021)
* it doesn't work with our current CSP
* it's probably not used by anyone
* it isn't in harmony with our security purposes
* literally removes all use of it
* suggestions from code review
* remove useless test.

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
Co-authored-by: Clement Michaud <clement.michaud34@gmail.com>
2020-05-16 09:41:42 +10:00
James Elliott 50f12bc4a4
[SECURITY] Fix Authentication HTTP Status Codes (#959)
* [FIX] Send correct HTTP status codes for 1FA

* use harmonious func to handle all 1FA attempt errors
* use same harmonious func to handle 2FA attempt errors
* always send a 401 which is correct according to https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/401
* fix tests
* refactor isTargetURLAuthorized
* fix padding and imports
* harmonize remaining return messages
* fixup docs and layout of verifySessionHasUpToDateProfile
2020-05-06 07:27:38 +10:00
Amir Zarrinkafsh 1600e0f7da
[CI] Add wsl linter (#980)
* [CI] Add wsl linter

* Implement wsl recommendations

Co-authored-by: Clément Michaud <clement.michaud34@gmail.com>
2020-05-05 21:35:32 +02:00
Amir Zarrinkafsh 87053c9312
[CI] Add linters: asciicheck, nolintlint and unconvert (#978) 2020-05-05 14:43:46 +10:00
James Elliott 3f374534ab
[FEATURE] Automatic Profile Refresh - LDAP (#912)
* [FIX] LDAP Not Checking for Updated Groups

* refactor handlers verifyFromSessionCookie
* refactor authorizer selectMatchingObjectRules
* refactor authorizer isDomainMatching
* add authorizer URLHasGroupSubjects method
* add user provider ProviderType method
* update tests
* check for new LDAP groups and update session when:
  * user provider type is LDAP
  * authorization is forbidden
  * URL has rule with group subjects

* Implement Refresh Interval

* add default values for LDAP user provider
* add default for refresh interval
* add schema validator for refresh interval
* add various tests
* rename hasUserBeenInactiveLongEnough to hasUserBeenInactiveTooLong
* use Authelia ctx clock
* add check to determine if user is deleted, if so destroy the
* make ldap user not found error a const
* implement GetRefreshSettings in mock

* Use user not found const with FileProvider
* comment exports

* use ctx.Clock instead of time pkg

* add debug logging

* use ptr to reference userSession so we don't have to retrieve it again

* add documenation
* add check for 0 refresh interval to reduce CPU cost
* remove badly copied debug msg

* add group change delta message

* add SliceStringDelta
* refactor ldap refresh to use the new func

* improve delta add/remove log message

* fix incorrect logic in SliceStringDelta
* add tests to SliceStringDelta

* add always config option
* add tests for always config option
* update docs

* apply suggestions from code review

Co-Authored-By: Amir Zarrinkafsh <nightah@me.com>

* complete mocks and fix an old one
* show warning when LDAP details failed to update for an unknown reason

* golint fix

* actually fix existing mocks

* use mocks for LDAP refresh testing

* use mocks for LDAP refresh testing for both added and removed groups

* use test mock to verify disabled refresh behaviour
* add information to threat model
* add time const for default Unix() value

* misc adjustments to mocks

* Suggestions from code review

* requested changes
* update emails
* docs updates
* test updates
* misc

* golint fix

* set debug for dev testing

* misc docs and logging updates

* misc grammar/spelling

* use built function for VerifyGet

* fix reviewdog suggestions

* requested changes

* Apply suggestions from code review

Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
Co-authored-by: Clément Michaud <clement.michaud34@gmail.com>
2020-05-04 21:39:25 +02:00
Amir Zarrinkafsh be0cc72473
[CI] Add goconst linter (#961)
* [CI] Add goconst linter

* Implement goconst recommendations

* Rename defaultPolicy to denyPolicy

* Change order for test constants

Co-authored-by: Clément Michaud <clement.michaud34@gmail.com>
2020-05-02 18:20:40 +02:00
Amir Zarrinkafsh e67f63ee44
[CI] Add godot linter (#958)
* [CI] Add godot linter

* Implement godot recommendations
2020-05-02 15:06:39 +10:00
Amir Zarrinkafsh aebcb38f90
[MISC] Fix goimports ordering for repo (#947) 2020-05-01 16:56:42 +10:00
Clément Michaud 9116135401
[BUGFIX] Bad redirection behavior after inactivity and inactivity update events. (#911)
* This affects primarily Authelia instances running behind Traefik or
nginx ingress controllers within Kubernetes because those proxies
require that Authelia returns 302 instead of 401 after the session
has been inactive for too long.
* fixes #909
* fixed activity timestamp not being updated when accessing forbidden resources.
* fix inactivity not updated when user was inactive for too long.
* cover inactivity timeout updates with unit tests.
2020-04-25 09:29:36 +10:00
Amir Zarrinkafsh 54694c4fca
[MISC] Ignore errcheck recommendations for legacy code (#893)
* [MISC] Ignore errcheck recommendations for legacy code
Some of this is likely intended to stay how it is, some could use refactoring, for now we will mark is and ignore it from the linter to be potentially addressed in the future.

* [MISC] Ensure files are gofmt-ed
2020-04-22 13:33:14 +10:00
Amir Zarrinkafsh 333137d56d
[MISC] Implement final golint recommendations (#888) 2020-04-21 10:48:24 +10:00
Amir Zarrinkafsh 2e784084c7
[MISC] Implement golint recommendations (#885)
Co-authored-by: Clément Michaud <clement.michaud34@gmail.com>
2020-04-20 23:03:38 +02:00
James Elliott e72c653f6e
[BUGFIX] 2FA after 1FA only when necessary for access to target (#881)
* prevents requirement to always 2FA if the user doesn't have permission to access a target URL
2020-04-19 21:45:46 +10:00
Dustin Sweigart 951dc71325
[FEATURE] Support multiple domains and multiple subjects in ACLs (#869)
* added support for listing multiple domains and multiple subjects

* updated documentation to show use of multiple domains and subjects

* updated config.template.yml to display multiple domains as a list

* updated config.template.yml to display multiple subjects as a list

* updated docs/configuration/access-control.md to display multiple domains as a list

* updated docs/configuration/access-control.md to display multiple subjects as a list

* removed redundant check that always returned true

* Commentary definition for `weak`
2020-04-16 10:18:11 +10:00
James Elliott b3ce7fc379
[BUGFIX] Password hashing schema map mismatch with docs (#852)
* add a nolint for gosec 'possibly hardcoded password' that was incorrect
* make all parameters consistent
* update the docs for the correct key name 'password' instead of 'password_options' or 'password_hashing'
* reword some of the docs
* apply suggestions from code review

Co-Authored-By: Amir Zarrinkafsh <nightah@me.com>
2020-04-11 13:54:18 +10:00
Amir Zarrinkafsh de2c5836fd
[Buildkite] Introduce CI linting with golangci-lint and reviewdog (#832)
* [Buildkite] Introduce CI linting with golangci-lint and reviewdog

* Initial pass of golangci-lint

* Add gosimple (megacheck) recommendations

* Add golint recommendations

* [BUGFIX] Migrate authentication traces from v3 mongodb

* Add deadcode recommendations

* [BUGFIX] Fix ShortTimeouts suite when run in dev workflow

* Add unused recommendations

* Add unparam recommendations

* Disable linting on unfixable errors instead of skipping files

* Adjust nolint notation for unparam

* Fix ineffectual assignment to err raised by linter.

* Export environment variable in agent hook

* Add ineffassign recommendations

* Add staticcheck recommendations

* Add gocyclo recommendations

* Adjust ineffassign recommendations

Co-authored-by: Clement Michaud <clement.michaud34@gmail.com>
2020-04-09 11:05:17 +10:00
James Elliott 2fed503e5e
[FEATURE] Customizable Email Subject (#830)
* [FEATURE] Customizable Email Subject

* allow users to optionally change email subject
* this is so they can more easily communicate the source of the email

* Update docs/configuration/notifier/smtp.md

Co-Authored-By: Amir Zarrinkafsh <nightah@me.com>

Co-authored-by: Clément Michaud <clement.michaud34@gmail.com>
Co-authored-by: Amir Zarrinkafsh <nightah@me.com>
2020-04-09 10:21:28 +10:00
James Elliott 8aade7f40e
[MISC] Update durations to notation format and housekeeping (#824)
* added regulation validator
* made regulations find_time and ban_time values duration notation strings
* added DefaultRegulationConfiguration for the validator
* made session expiration and inactivity values duration notation strings
* TOTP period does not need to be converted because adjustment should be discouraged
* moved TOTP defaults to DefaultTOTPConfiguration and removed the consts
* arranged the root config validator in configuration file order
* adjusted tests for the changes
* moved duration notation docs to root of configuration
* added references to duration notation where applicable
* project wide gofmt and goimports:
* run gofmt
* run goimports -local github.com/authelia/authelia -w on all files
* Make jwt_secret error uniform and add tests
* now at 100% coverage for internal/configuration/validator/configuration.go
2020-04-05 22:37:21 +10:00
James Elliott 9800421b88
[FEATURE] Disable Reset Password (#823)
* [FEATURE] Disable Reset Password
* add configuration key to authentication_backend called disable_reset_password
* disable_reset_password prevents the API handler for the functionality and the UI element
* disable_reset_password is a boolean
* adjust RememberMeEnabled to be RememberMe instead as it's just unnecessary
* add docs for security measures and in the authentication docs
* updated config.template.yml
* add flexEnd style to align reset password when remember me disabled
* add todo items for ldap user/password validation relating to this
2020-04-05 09:28:09 +10:00
James Elliott 626f5d2949
[FEATURE] Remember Me Configuration (#813)
* [FEATURE] Remember Me Configuration
* allow users to specify the duration of remember me using remember_me_duration in session config
* setting the duration to 0 disables remember me
* only render the remember me element if remember me is enabled
* prevent malicious users from faking remember me functionality in the backend
* add string to duration helper called ParseDurationString to parse a string into a duration
* added tests to the helper function
* use the SessionProvider to store the time.Duration instead of parsing it over and over again
* add sec doc, adjust month/min, consistency
* renamed internal/utils/constants.go to internal/utils/const.go to be consistent
* added security measure docs
* adjusted default remember me duration to be 1 month instead of 1 year
* utilize default remember me duration in the autheliaCtx mock
* adjust order of keys in session configuration examples
* add notes on session security measures secret only being redis 
* add TODO items for duration notation for both Expiration and Inactivity (will be removed soon)
* fix error text for Inactivity in the validator 
* add session validator tests
* deref check bodyJSON.KeepMeLoggedIn and derive the value based on conf and user input and store it (DRY)
* remove unnecessary regex for the simplified ParseDurationString utility
* ParseDurationString only accepts decimals without leading zeros now
* comprehensively test all unit types
* remove unnecessary type unions in web
* add test to check sanity of time duration consts, this is just so they can't be accidentally changed
* simplify deref check and assignment
* fix reset password padding/margins
* adjust some doc wording
* adjust the handler configuration suite test
* actually run the handler configuration suite test (whoops)
* reduce the number of regex's used by ParseDurationString to 1, thanks to Clement
* adjust some error wording
2020-04-04 10:11:33 +11:00
James Elliott 40fb13ba3c
[FEATURE] TOTP Tuning Configuration Options and Fix Timer Graphic (#773)
* Add period TOPT config key to define the time in seconds each OTP is rotated
* Add skew TOTP config to define how many keys either side of the current one should be considered valid
* Add tests and set minimum values
* Update config template
* Use unix epoch for position calculation and Fix QR gen
  * This resolves the timer resetting improperly at the 0 seconds mark and allows for periods longer than 1 minute
* Generate QR based on period
* Fix OTP timer graphic
2020-03-25 12:48:20 +11:00
Clément Michaud 2b4bb3bb05
[MISC] Debug message shows used headers instead of fallback warning. (#772)
This enhancement clarifies the log message following discussions, closes #691.
2020-03-23 09:12:24 +11:00