webdav

A simple and standalone WebDAV server.

Install

For a manual install, please refer to the releases page and download the correct binary for your system. Alternatively, you can build or install it from source using the Go toolchain. You can either clone the repository and execute go build, or directly install it, using:

go install github.com/hacdias/webdav/v5@latest

Docker

Docker images are provided on both GitHub's registry and Docker Hub. You can pull the images using one of the following two commands. Note that this commands pull the latest released version. You can use specific tags to pin specific versions, or use main for the development branch.

# GitHub Registry
docker pull ghcr.io/hacdias/webdav:latest

# Docker Hub
docker pull hacdias/webdav:latest

Usage

For usage information regarding the CLI, run webdav --help.

Docker

To use with Docker, you need to provide a configuration file and mount the data directories. For example, let's take the following configuration file that simply sets the port to 6060 and the directory to /data.

port: 6060
directory: /data

You can now run with the following Docker command, where you mount the configuration file inside the container, and the data directory too, as well as forwarding the port 6060. You will need to change this to match your own configuration.

docker run \
  -p 6060:6060 \
  -v $(pwd)/config.yml:/config.yml:ro \
  -v $(pwd)/data:/data \
  ghcr.io/hacdias/webdav -c /config.yml

Configuration

The configuration can be provided as a YAML, JSON or TOML file. Below is an example of a YAML configuration file with all the options available, as well as what they mean.

address: 0.0.0.0
port: 6065

# TLS-related settings if you want to enable TLS directly.
tls: false
cert: cert.pem
key: key.pem

# Prefix to apply to the WebDAV path-ing. Default is '/'.
prefix: /

# Enable or disable debug logging. Default is 'false'.
debug: false

# Disable sniffing the files to detect their content type. Default is 'false'.
noSniff: false

# Whether the server runs behind a trusted proxy or not. When this is true,
# the header X-Forwarded-For will be used for logging the remote addresses
# of logging attempts (if available).
behindProxy: false

# The directory that will be able to be accessed by the users when connecting.
# This directory will be used by users unless they have their own 'directory' defined.
# Default is '.' (current directory).
directory: .

# The default permissions for users. This is a case insensitive option. Possible
# permissions: C (Create), R (Read), U (Update), D (Delete). You can combine multiple
# permissions. For example, to allow to read and create, set "RC". Default is "R".
permissions: R

# The default permissions rules for users. Default is none. Rules are applied
# from last to first, that is, the first rule that matches the request, starting
# from the end, will be applied to the request.
rules: []

# The behavior of redefining the rules for users. It can be:
# - overwrite: when a user has rules defined, these will overwrite any global
#   rules already defined. That is, the global rules are not applicable to the
#   user.
# - append: when a user has rules defined, these will be appended to the global
#   rules already defined. That is, for this user, their own specific rules will
#   be checked first, and then the global rules.
# Default is 'overwrite'.
rulesBehavior: overwrite

# Logging configuration
log:
  # Logging format ('console', 'json'). Default is 'console'.
  format: console
  # Enable or disable colors. Default is 'true'. Only applied if format is 'console'.
  colors: true
  # Logging outputs. You can have more than one output. Default is only 'stderr'.
  outputs:
  - stderr

# CORS configuration
cors:
  # Whether or not CORS configuration should be applied. Default is 'false'.
  enabled: true
  credentials: true
  allowed_headers:
    - Depth
  allowed_hosts:
    - http://localhost:8080
  allowed_methods:
    - GET
  exposed_headers:
    - Content-Length
    - Content-Range

# The list of users. If the list is empty, then there will be no authentication.
# Otherwise, basic authentication will automatically be configured.
#
# If you're delegating the authentication to a different service, you can proxy
# the username using basic authentication, and then disable webdav's password
# check using the option:
#
# noPassword: true
users:
  # Example 'admin' user with plaintext password.
  - username: admin
    password: admin
  # Example 'john' user with bcrypt encrypted password, with custom directory.
  # You can generate a bcrypt-encrypted password by using the 'webdav bcrypt'
  # command lint utility.
  - username: john
    password: "{bcrypt}$2y$10$zEP6oofmXFeHaeMfBNLnP.DO8m.H.Mwhd24/TOX2MWLxAExXi4qgi"
    directory: /another/path
  # Example user whose details will be picked up from the environment.
  - username: "{env}ENV_USERNAME"
    password: "{env}ENV_PASSWORD"
  - username: basic
    password: basic
    # Override default permissions.
    permissions: CRUD
    rules:
      # With this rule, the user CANNOT access /some/files.
      - path: /some/file
        permissions: none
      # With this rule, the user CAN create, read, update and delete within /public/access.
      - path: /public/access/
        permissions: CRUD
      # With this rule, the user CAN read and update all files ending with .js. It uses
      # a regular expression.
      - regex: "^.+.js$"
        permissions: RU

CORS

The allowed_* properties are optional, the default value for each of them will be *. exposed_headers is optional as well, but is not set if not defined. Setting credentials to true will allow you to:

1. Use withCredentials = true in javascript.
2. Use the username:password@host syntax.

Caveats

Reverse Proxy Service

When using a reverse proxy implementation, like Caddy, Nginx, or Apache, note that you need to forward the correct headers in order to avoid 502 errors. Here's a Nginx configuration example:

location / {
  proxy_pass http://127.0.0.1:8080;
  proxy_set_header X-Real-IP $remote_addr;
  proxy_set_header REMOTE-HOST $remote_addr;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $host;
  proxy_redirect off;
}

Examples

Systemd

Example configuration of a systemd service:

[Unit]
Description=WebDAV
After=network.target

[Service]
Type=simple
User=root
ExecStart=/usr/bin/webdav --config /opt/webdav.yml
Restart=on-failure

[Install]
WantedBy=multi-user.target

Fail2Ban Setup

To add security against brute-force attacks in your WebDAV server, you can configure Fail2Ban to ban IP addresses after a set number of failed login attempts.

Filter Configuration

Create a new filter rule under filter.d/webdav.conf:

[INCLUDES]
before = common.conf

[Definition]
# Failregex to match "invalid password" and extract remote_address only
failregex = ^.*invalid password\s*\{.*"remote_address":\s*"<HOST>"\s*\}

# Failregex to match "invalid username" and extract remote_address only (if applicable)
failregex += ^.*invalid username\s*\{.*"remote_address":\s*"<HOST>"\s*\}

ignoreregex =

This configuration will capture invalid login attempts and extract the IP address to ban.

Jail Configuration

In jail.d/webdav.conf, define the jail that monitors your WebDAV log for failed login attempts:

[webdav]

enabled = true
port = [your_port]
filter = webdav
logpath = [your_log_path]
banaction = iptables-allports
ignoreself = false

• Replace [your_port] with the port your WebDAV server is running on.
• Replace [your_log_path] with the path to your WebDAV log file.

Final Steps

1. Restart Fail2Ban to apply these configurations:

   sudo systemctl restart fail2ban

2. Verify that Fail2Ban is running and monitoring your WebDAV logs:

   sudo fail2ban-client status webdav

With this setup, Fail2Ban will automatically block IP addresses that exceed the allowed number of failed login attempts.

Contributing

Feel free to open an issue or a pull request.

License

MIT License © Henrique Dias