nextcloud / nextcloud/user_saml

SAML: Invalid base URL

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Description

Steps to reproduce
  1. Install Nextcloud from Ubuntu Snap
  2. Reverse proxy (incl. adding SSL) using Apache so that it is served from https://www.example.com/files
    This involves properly setting up the following configuration values:
root@server:/var/snap/nextcloud/current/nextcloud/config# nextcloud.occ config:system:get overwritehost
www.example.com
root@server:/var/snap/nextcloud/current/nextcloud/config# nextcloud.occ config:system:get overwritewebroot
/files
root@server:/var/snap/nextcloud/current/nextcloud/config# nextcloud.occ config:system:get overwriteprotocol
https
root@server:/var/snap/nextcloud/current/nextcloud/config# nextcloud.occ config:system:get overwrite.cli.url
https://www.example.com/files
root@server:/var/snap/nextcloud/current/nextcloud/config# nextcloud.occ config:system:get htaccess.RewriteBase
/files
  1. Enable and configure the SAML/SSO App. In my case, Apereo CAS is the IdP
Expected behaviour

The users should be able to login using SAML/SSO

Actual behaviour

Error Message: Your account is not provisioned, access to this service is thus not possible.

Logged error:

The response was received at https://www.example.com/index.php/apps/user_saml/saml/acs instead of https://www.example.com/files/index.php/apps/user_saml/saml/acs

Note that the "received at" URL does not include "/files" which does not make any sense as Nextcloud is not reachable at this URL.

Server configuration

Latest Ubuntu 16.04 with Nextcloud installed today from snap
List of activated apps:

Only the SAML/SSO App

Nextcloud configuration:

{
    "system": {
        "apps_paths": [
            {
                "path": "\/snap\/nextcloud\/current\/htdocs\/apps",
                "url": "\/apps",
                "writable": false
            },
            {
                "path": "\/var\/snap\/nextcloud\/current\/nextcloud\/extra-apps",
                "url": "\/extra-apps",
                "writable": true
            }
        ],
        "supportedDatabases": [
            "mysql"
        ],
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "memcache.local": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "\/tmp\/sockets\/redis.sock",
            "port": 0
        },
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "localhost",
            "www.example.com"
        ],
        "datadirectory": "\/var\/snap\/nextcloud\/common\/nextcloud\/data",
        "overwrite.cli.url": "https:\/\/www.example.com\/files",
        "dbtype": "mysql",
        "version": "12.0.5.3",
        "dbname": "nextcloud",
        "dbhost": "localhost:\/tmp\/sockets\/mysql.sock",
        "dbport": "",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "removed",
        "overwritewebroot": "\/files",
        "overwriteprotocol": "https",
        "overwritehost": "www.example.com",
        "htaccess.RewriteBase": "\/files"
    },
    "apps": {
        "activity": {
            "enabled": "yes",
            "installed_version": "2.5.2",
            "types": "filesystem"
        },
        "backgroundjob": {
            "lastjob": "13"
        },
        "comments": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "logging"
        },
        "core": {
            "backgroundjobs_mode": "cron",
            "installedat": "1520332458.1067",
            "lastcron": "1520343808",
            "lastupdatedat": "1520332458.1365",
            "public_files": "files_sharing\/public.php",
            "public_webdav": "dav\/appinfo\/v1\/publicwebdav.php",
            "scss.variables": "dee9f5859c72e10315ab472254fafcd5",
            "vendor": "nextcloud"
        },
        "dav": {
            "enabled": "yes",
            "installed_version": "1.3.1",
            "types": "filesystem"
        },
        "federatedfilesharing": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "federation": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "authentication"
        },
        "files": {
            "cronjob_scan_files": "500",
            "enabled": "yes",
            "installed_version": "1.7.2",
            "types": "filesystem"
        },
        "files_pdfviewer": {
            "enabled": "yes",
            "installed_version": "1.1.1",
            "ocsid": "166049",
            "types": ""
        },
        "files_sharing": {
            "enabled": "yes",
            "installed_version": "1.4.0",
            "types": "filesystem"
        },
        "files_texteditor": {
            "enabled": "yes",
            "installed_version": "2.4.1",
            "ocsid": "166051",
            "types": ""
        },
        "files_trashbin": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "filesystem"
        },
        "files_versions": {
            "enabled": "yes",
            "installed_version": "1.5.0",
            "types": "filesystem"
        },
        "files_videoplayer": {
            "enabled": "yes",
            "installed_version": "1.1.0",
            "types": ""
        },
        "firstrunwizard": {
            "enabled": "yes",
            "installed_version": "2.1",
            "types": "logging"
        },
        "gallery": {
            "enabled": "yes",
            "installed_version": "17.0.0",
            "types": ""
        },
        "logreader": {
            "enabled": "yes",
            "installed_version": "2.0.0",
            "ocsid": "170871",
            "types": ""
        },
        "lookup_server_connector": {
            "enabled": "yes",
            "installed_version": "1.0.0",
            "types": "authentication"
        },
        "nextcloud_announcements": {
            "enabled": "yes",
            "installed_version": "1.1",
            "pub_date": "Sat, 10 Dec 2016 00:00:00 +0100",
            "types": "logging"
        },
        "notifications": {
            "enabled": "yes",
            "installed_version": "2.0.0",
            "types": "logging"
        },
        "oauth2": {
            "enabled": "yes",
            "installed_version": "1.0.5",
            "types": "authentication"
        },
        "password_policy": {
            "enabled": "yes",
            "installed_version": "1.2.2",
            "types": ""
        },
        "provisioning_api": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "prevent_group_restriction"
        },
        "serverinfo": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": ""
        },
        "sharebymail": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "filesystem"
        },
        "survey_client": {
            "enabled": "yes",
            "installed_version": "1.0.0",
            "types": ""
        },
        "systemtags": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "logging"
        },
        "theming": {
            "cachebuster": "2",
            "enabled": "yes",
            "installed_version": "1.3.0",
            "name": "Cloud",
            "types": "logging",
            "url": "https:\/\/www.example.com\/files\/"
        },
        "twofactor_backupcodes": {
            "enabled": "yes",
            "installed_version": "1.1.1",
            "types": ""
        },
        "user_saml": {
            "enabled": "no",
            "general-uid_mapping": "urn:oid:1.3.6.1.4.1.5923.1.1.1.6",
            "general-use_saml_auth_for_desktop": "1",
            "idp-entityId": "https:\/\/idp.example.com\/cas\/idp\/",
            "idp-singleLogoutService.url": "https:\/\/idp.example.com\/cas\/idp\/profile\/SAML2\/Redirect\/SLO",
            "idp-singleSignOnService.url": "https:\/\/idp.example.com\/cas\/idp\/profile\/SAML2\/Redirect\/SSO",
            "idp-x509cert": "removed",
            "installed_version": "1.4.2",
            "security-nameIdEncrypted": "0",
            "sp-x509cert": "",
            "type": "saml",
            "types": "authentication"
        },
        "workflowengine": {
            "enabled": "yes",
            "installed_version": "1.2.0",
            "types": "filesystem"
        }
    }
}
Client configuration

Latest Chrome, Windows 10

Logs
Nextcloud log (data/owncloud.log)
The response was received at https://www.example.com/index.php/apps/user_saml/saml/acs instead of https://www.example.com/files/index.php/apps/user_saml/saml/acs```

#### Browser log


Thank you in advance for any help!

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Reproduce the Ubuntu Snap and Apache reverse-proxy setup using the reported overwritewebroot and SAML settings. Trace how the user_saml endpoint at /index.php/apps/user_saml/saml/acs handles the /files base path, then repeat the SSO flow and verify that the response is accepted at the configured ACS URL.

Written by the indexing model from the issue text.

Assessment

Tech stack
php
Domain
authentication, security
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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