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sftpgo/README.md
Jo Vandeginste bd7b6a785e Support multiple private (host) keys 
With this patch, one can configure one or more private (host) keys in
the configuration file.

I made it a nested struct, so we can add more options later. Eg. host
certificates might be a useful addition if I can figure out how this is
done in golang's crypto/ssh...

Signed-off-by: Jo Vandeginste <Jo.Vandeginste@kuleuven.be>
2019-08-01 14:57:15 +02:00

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# SFTPGo
[![Build Status](https://travis-ci.org/drakkan/sftpgo.svg?branch=master)](https://travis-ci.org/drakkan/sftpgo) [![Code Coverage](https://codecov.io/gh/drakkan/sftpgo/branch/master/graph/badge.svg)](https://codecov.io/gh/drakkan/sftpgo/branch/master) [![Go Report Card](https://goreportcard.com/badge/github.com/drakkan/sftpgo)](https://goreportcard.com/report/github.com/drakkan/sftpgo) [![License: GPL v3](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
Full featured and highly configurable SFTP server software
## Features
- Each account is chrooted to his Home Dir
- SFTP accounts are virtual accounts stored in a "data provider"
- SQLite, MySQL and PostgreSQL data providers are supported. The `Provider` interface could be extended to support non SQL backends too
- Public key and password authentication
- Quota support: accounts can have individual quota expressed as max number of files and max total size
- Bandwidth throttling is supported, with distinct settings for upload and download
- Per user maximum concurrent sessions
- Per user permissions: list directories content, upload, download, delete, rename, create directories, create symlinks can be enabled or disabled
- Per user files/folders ownership: you can map all the users to the system account that runs SFTPGo (all platforms are supported) or you can run SFTPGo as root user and map each user or group of users to a different system account (*NIX only)
- Configurable custom commands and/or HTTP notifications on SFTP upload, download, delete or rename
- REST API for users and quota management and real time reports for the active connections with possibility of forcibly closing a connection
- Log files are accurate and they are saved in the easily parsable JSON format
- Automatically terminating idle connections
## Platforms
SFTPGo is developed and tested on Linux. After each commit the code is automatically built and tested on Linux and macOS using Travis CI.
Regularly the test cases are manually executed and pass on Windows. Other UNIX variants such as *BSD should work too.
## Requirements
- Go 1.12 or higher
- A suitable SQL server to use as data provider: PostreSQL (9+) or MySQL (4.1+) or SQLite 3.x
## Installation
Simple install the package to your [$GOPATH](https://github.com/golang/go/wiki/GOPATH "GOPATH") with the [go tool](https://golang.org/cmd/go/ "go command") from shell:
```bash
$ go get -u github.com/drakkan/sftpgo
```
Make sure [Git is installed](https://git-scm.com/downloads) on your machine and in your system's `PATH`.
A systemd sample [service](https://github.com/drakkan/sftpgo/tree/master/init/sftpgo.service "systemd service") can be found inside the source tree.
Alternately you can use distro packages:
- Arch Linux PKGBUILD is available on [AUR](https://aur.archlinux.org/packages/sftpgo-git/ "SFTPGo")
## Configuration
The `sftpgo` executable supports the following command line flags:
- `-config-dir` string. Location of the config dir. This directory should contain the `sftpgo.conf` configuration file and is used as the base for files with a relative path (eg. the private keys for the SFTP server, the SQLite database if you use SQLite as data provider). The default value is "."
- `-log-file-path` string. Location for the log file, default "sftpgo.log"
- `-log-max-size` int. Maximum size in megabytes of the log file before it gets rotated. Default 10
- `-log-max-backups` int. Maximum number of old log files to retain. Default 5
- `-log-max-age` int. Maximum number of days to retain old log files. Default 28
- `-log-compress` boolean. Determine if the rotated log files should be compressed using gzip
- `-log-verbose` boolean. Enable verbose logs. Default `true`
If you don't configure any private host keys, the daemon will use `id_rsa` in the configuration directory. If that file doesn't exist, the daemon will attempt to autogenerate it (if the user that executes SFTPGo has write access to the config-dir). The server supports any private key format supported by [`crypto/ssh`](https://github.com/golang/crypto/blob/master/ssh/keys.go#L32).
Before starting `sftpgo` a dataprovider must be configured.
Sample SQL scripts to create the required database structure can be found insite the source tree [sql](https://github.com/drakkan/sftpgo/tree/master/sql "sql") directory. The SQL scripts filename's is, by convention, the date as `YYYYMMDD` and the suffix `.sql`. You need to apply all the SQL scripts for your database ordered by name, for example `20190706.sql` must be applied before `20190728.sql` and so on.
The `sftpgo.conf` configuration file contains the following sections:
- **"sftpd"**, the configuration for the SFTP server
- `bind_port`, integer. The port used for serving SFTP requests. Default: 2022
- `bind_address`, string. Leave blank to listen on all available network interfaces. Default: ""
- `idle_timeout`, integer. Time in minutes after which an idle client will be disconnected. Default: 15
- `max_auth_tries` integer. Maximum number of authentication attempts permitted per connection. If set to a negative number, the number of attempts are unlimited. If set to zero, the number of attempts are limited to 6.
- `umask`, string. Umask for the new files and directories. This setting has no effect on Windows. Default: "0022"
- `banner`, string. Identification string used by the server. Default "SFTPGo"
- `actions`, struct. It contains the command to execute and/or the HTTP URL to notify and the trigger conditions
- `execute_on`, list of strings. Valid values are `download`, `upload`, `delete`, `rename`. On folder deletion a `delete` notification will be sent for each deleted file. Leave empty to disable actions.
- `command`, string. Absolute path to the command to execute. Leave empty to disable. The command is invoked with the following arguments:
- `action`, any valid `execute_on` string
- `username`, user who did the action
- `path` to the affected file. For `rename` action this is the old file name
- `target_path`, non empty for `rename` action, this is the new file name
- `http_notification_url`, a valid URL. An HTTP GET request will be executed to this URL. Leave empty to disable. The query string will contain the following parameters that have the same meaning of the command's arguments:
- `action`
- `username`
- `path`
- `target_path`, added for `rename` action only
- `keys`, struct array. It contains the daemon's private keys
- `private_key`, path to the private key file
- **"data_provider"**, the configuration for the data provider
- `driver`, string. Supported drivers are `sqlite`, `mysql`, `postgresql`
- `name`, string. Database name. For driver `sqlite` this can be the database name relative to the config dir or the absolute path to the SQLite database.
- `host`, string. Database host. Leave empty for driver `sqlite`
- `port`, integer. Database port. Leave empty for driver `sqlite`
- `username`, string. Database user. Leave empty for driver `sqlite`
- `password`, string. Database password. Leave empty for driver `sqlite`
- `sslmode`, integer. Used for drivers `mysql` and `postgresql`. 0 disable SSL/TLS connections, 1 require ssl, 2 set ssl mode to `verify-ca` for driver `postgresql` and `skip-verify` for driver `mysql`, 3 set ssl mode to `verify-full` for driver `postgresql` and `preferred` for driver `mysql`
- `connectionstring`, string. Provide a custom database connection string. If not empty this connection string will be used instead of build one using the previous parameters
- `users_table`, string. Database table for SFTP users
- `manage_users`, integer. Set to 0 to disable users management, 1 to enable
- `track_quota`, integer. Set the preferred way to track users quota between the following choices:
- 0, disable quota tracking. REST API to scan user dir and update quota will do nothing
- 1, quota is updated each time a user upload or delete a file even if the user has no quota restrictions
- 2, quota is updated each time a user upload or delete a file but only for users with quota restrictions. With this configuration the "quota scan" REST API can still be used to periodically update space usage for users without quota restrictions
- **"httpd"**, the configuration for the HTTP server used to serve REST API
- `bind_port`, integer. The port used for serving HTTP requests. Set to 0 to disable HTTP server. Default: 8080
- `bind_address`, string. Leave blank to listen on all available network interfaces. Default: "127.0.0.1"
Here is a full example showing the default config:
```json
{
"sftpd": {
"bind_port": 2022,
"bind_address": "",
"idle_timeout": 15,
"max_auth_tries": 0,
"umask": "0022",
"banner": "SFTPGo",
"actions": {
"execute_on": [],
"command": "",
"http_notification_url": ""
},
"keys": [
{
"private_key": "id_rsa"
},
{
"private_key": "id_ecdsa"
}
]
},
"data_provider": {
"driver": "sqlite",
"name": "sftpgo.db",
"host": "",
"port": 5432,
"username": "",
"password": "",
"sslmode": 0,
"connection_string": "",
"users_table": "users",
"manage_users": 1,
"track_quota": 2
},
"httpd": {
"bind_port": 8080,
"bind_address": "127.0.0.1"
}
}
```
## Account's configuration properties
For each account the following properties can be configured:
- `username`
- `password` used for password authentication. For users created using SFTPGo REST API the password will be stored using argon2id hashing algo. SFTPGo supports checking passwords stored with bcrypt too. Currently, as fallback, there is a clear text password checking but you should not store passwords as clear text and this support could be removed at any time, so please don't depend on it.
- `public_key` used for public key authentication. At least one between password and public key is mandatory. Multiple public keys are supported, newline delimited (unix line break unescaped).
- `home_dir` The user cannot upload or download files outside this directory. Must be an absolute path
- `uid`, `gid`. If sftpgo runs as root system user then the created files and directories will be assigned to this system uid/gid. Ignored on windows and if sftpgo runs as non root user: in this case files and directories for all SFTP users will be owned by the system user that runs sftpgo.
- `max_sessions` maximum concurrent sessions. 0 means unlimited
- `quota_size` maximum size allowed as bytes. 0 means unlimited
- `quota_files` maximum number of files allowed. 0 means unlimited
- `permissions` the following permissions are supported:
- `*` all permission are granted
- `list` list items is allowed
- `download` download files is allowed
- `upload` upload files is allowed
- `delete` delete files or directories is allowed
- `rename` rename files or directories is allowed
- `create_dirs` create directories is allowed
- `create_symlinks` create symbolic links is allowed
- `upload_bandwidth` maximum upload bandwidth as KB/s, 0 means unlimited
- `download_bandwidth` maximum download bandwidth as KB/s, 0 means unlimited
These properties are stored inside the data provider. If you want to use your existing accounts, you can create a database view. Since a view is read only, you have to disable user management and quota tracking so sftpgo will never try to write to the view.
## REST API
SFTPGo exposes REST API to manage users and quota and to get real time reports for the active connections with possibility of forcibly closing a connection.
If quota tracking is enabled in `sftpgo.conf` configuration file, then the used size and number of files are updated each time a file is added/removed. If files are added/removed not using SFTP or if you change `track_quota` from `2` to `1`, you can rescan the user home dir and update the used quota using the REST API.
REST API is designed to run on localhost or on a trusted network, if you need https or authentication you can setup a reverse proxy using an HTTP Server such as Apache or NGNIX.
The OpenAPI 3 schema for the exposed API can be found inside the source tree: [openapi.yaml](https://github.com/drakkan/sftpgo/tree/master/api/schema/openapi.yaml "OpenAPI 3 specs").
## Logs
Inside the log file each line is a JSON struct, each struct has a `sender` fields that identify the log type.
The logs can be divided into the following categories:
- **"app logs"**, internal logs used to debug `sftpgo`:
- `sender` string. This is generally the package name that emits the log
- `time` string. Date/time with millisecond precision
- `level` string
- `message` string
- **"transfer logs"**, SFTP transfer logs:
- `sender` string. `SFTPUpload` or `SFTPDownload`
- `time` string. Date/time with millisecond precision
- `level` string
- `elapsed_ms`, int64. Elapsed time, as milliseconds, for the upload/download
- `size_bytes`, int64. Size, as bytes, of the download/upload
- `username`, string
- `file_path` string
- `connection_id` string. Unique SFTP connection identifier
- **"command logs"**, SFTP command logs:
- `sender` string. `SFTPRename`, `SFTPRmdir`, `SFTPMkdir`, `SFTPSymlink`, `SFTPRemove`
- `level` string
- `username`, string
- `file_path` string
- `target_path` string
- `connection_id` string. Unique SFTP connection identifier
- **"http logs"**, REST API logs:
- `sender` string. `httpd`
- `level` string
- `remote_addr` string. IP and port of the remote client
- `proto` string, for example `HTTP/1.1`
- `method` string. HTTP method (`GET`, `POST`, `PUT`, `DELETE` etc.)
- `user_agent` string
- `uri` string. Full uri
- `resp_status` integer. HTTP response status code
- `resp_size` integer. Size in bytes of the HTTP response
- `elapsed_ms` int64. Elapsed time, as milliseconds, to complete the request
- `request_id` string. Unique request identifier
## Acknowledgements
- [pkg/sftp](https://github.com/pkg/sftp)
- [go-chi](https://github.com/go-chi/chi)
- [zerolog](https://github.com/rs/zerolog)
- [lumberjack](https://gopkg.in/natefinch/lumberjack.v2)
- [argon2id](https://github.com/alexedwards/argon2id)
- [go-sqlite3](https://github.com/mattn/go-sqlite3)
- [go-sql-driver/mysql](https://github.com/go-sql-driver/mysql)
- [lib/pq](https://github.com/lib/pq)
Some code was initially taken from [Pterodactyl sftp server](https://github.com/pterodactyl/sftp-server)
## License
GNU GPLv3
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