sshportal

Jump host/Jump server without the jump, a.k.a Transparent SSH bastion

IMPORTANT NOTE

The original project is no longer being maintained. This fork includes important security fixes, some bugfixes and features but it is on MAINTENANCE mode and only security issues and major bugs will be fixed. You should consider using Teleport instead.

Installation and usage
Quick Start
Features and limitations
Backup / Restore
Built-in shell
Healthcheck
Portal alias (.ssh/config)
Under the hood
Testing

Installation

Packaged installation (.deb & .rpm) is privileged as it comes with a hardened systemd service and a SELinux module if you have enfored SELinux on your GNU/Linux distribution.

Get the latest version here

Note : by default, your package manager will automatically install sqlite (recommended dependency)

This installation will install sshportal as a systemd service, configure logrotate to keep 1 year of audit logs and add a systemd timer for session logs management. See packaging.

If mariadb is selected during the install, it will also automatically create the sshportal database if it doesn't exist.

Show Debian-based distributions instructions

apt install ./sshportal_x.x.x_xxx.deb

You will be asked if you want to use mariadb instead of sqlite (default). Make sure to install mariadb-server before as the package is not listed as a hard dependency in the control file.

To install SSHportal with mariadb:

apt install --no-install-recommends -y mariadb-server
DEBIAN_FRONTEND=noninteractive SSHPORTAL_MARIADB_SETUP=true apt install --no-install-recommends -y mariadb-server ./sshportal_x.x.x_xxx.deb

If you want to stick with sqlite, you just have to do this:

DEBIAN_FRONTEND=noninteractive apt install -y ./sshportal_x.x.x_xxx.deb

Show RedHat-based distributions instructions

Make sure to install mariadb-server before if you want to use it as this package is not listed as a hard dependency in the control file.

There is no debconf in RedHat distribution so if you want an automatic mariadb setup you need to install sshportal with :

dnf install -y --setopt=install_weak_deps=False mariadb-server
SSHPORTAL_MARIADB_SETUP=true dnf install --setopt=install_weak_deps=False ./sshportal_x.x.x_xxx.rpm

If you want to stick with sqlite, you just have to do this:

dnf install -y ./sshportal_x.x.x_xxx.rpm

Docker instructions

An automated build is setup on the Github registry.

# Start a server in background
# mount `pwd` to persist the sqlite database file
docker run -p 2222:2222 -d --name=sshportal -v "$(pwd):$(pwd)" -w "$(pwd)" ghcr.io/alterway/sshportal:latest

# check logs (mandatory on first run to get the administrator invite token)
docker logs -f sshportal

Quick start

Get the invite token in stdout or /var/log/sshportal/audit/audit.log if installed from a package manager :

2023/09/01 15:03:18 info: system migrated
2023/09/01 15:03:18 info: 'sshportal' user created. Run 'ssh localhost -p 2222 -l invite:6tUguNFYxeOxdx0N' to associate your public key with this account
2023/09/01 15:03:18 info: SSH Server accepting connections on :2222, idle-timout=0s

Make sure you have a ssh key pair and associate your public key to the bastion

ssh localhost -p 2222 -l invite:xxxxxxx

Welcome sshportal!

Your key is now associated with the user "sshportal@localhost".

Your first user is the admin. To access to the console, connect like a normal server

ssh sshportal@localhost -p 2222

Create your first host

config> host create [email protected]
1
config>

List hosts

config> host ls
  ID | NAME |           URL           |   KEY   | PASS | GROUPS  | COMMENT
+----+------+-------------------------+---------+------+---------+---------+
   1 | foo  | [email protected]:22 | default |      | default |
Total: 1 hosts.
config>

Add the host key to the server

config> host ls
  ID | NAME | URL | KEY | GROUPS | UPDATED | CREATED | COMMENT | HOP | LOGGING
-----+------+-----+-----+--------+---------+---------+---------+-----+----------
Total: 0 hosts.
config> key ls
  ID |  NAME   |  TYPE   | LENGTH | HOSTS |   UPDATED    |   CREATED    |       COMMENT
-----+---------+---------+--------+-------+--------------+--------------+-----------------------
   2 | host    | ed25519 |      1 |     0 | 1 minute ago | 1 minute ago | created by sshportal
   1 | default | ed25519 |      1 |     0 | 1 minute ago | 1 minute ago | created by sshportal

ssh [email protected] "$(ssh sshportal@localhost -p 2222 key setup host)"

ssh [email protected] "$(ssh sshportal@localhost -p 2222 key setup host)"

Profit

ssh localhost -p 2222 -l foo
bart@foo>

Invite friends

This command doesn't create a user on the remote server, it only creates an account in the sshportal database.

config> user invite [email protected]
User 2 created.
To associate this account with a key, use the following SSH user: 'invite:NfHK5a84jjJkwzDk'.

Demo gif:

Features and limitations

Single autonomous binary (~20Mb) with no runtime dependencies (except glibc)
Portable / Cross-platform (regularly tested on linux and OSX/darwin)
Store data in Sqlite3 or MySQL
Stateless -> horizontally scalable when using MySQL as the backend
Connect to remote host using key or password
Admin commands can be run directly or in an interactive shell
Host management
User management (invite, group, stats)
Host Key management (create, remove, update, import)
Automatic remote host key learning
User Key management (multiple keys per user)
ACL management (acl + user-groups + host-groups)
User roles (admin, trusted, standard, ...)
User invitations (no more "give me your public ssh key please")
Easy server installation (generate shell command to setup authorized_keys)
Sensitive data encryption
Session management (see active connections, history, stats, stop)
Audit log (logging every user action)
Record TTY Session (with ttyrec format, use ttyplay for replay)
Tunnels logging
Host Keys verifications shared across users
Healthcheck user (replying OK to any user)
SSH compatibility
- ipv4 and ipv6 support
- scp support
- rsync support
- tunneling (local forward, remote forward, dynamic forward) support
- sftp support
- ssh-agent support
- X11 forwarding support
- Git support (can be used to easily use multiple user keys on GitHub, or access your own firewalled gitlab server)
- Do not require any SSH client modification or custom .ssh/config, works with every tested SSH programming libraries and every tested SSH clients
SSH to non-SSH proxy
- Telnet support

(Known) limitations

Does not work with mosh
It is not possible for a user to access a host with the same name as the user. This is easily circumvented by changing the user name, especially since the most common use cases does not expose it.
It is not possible to access a host named healthcheck as this is a built-in command.

Backup / Restore

sshportal embeds built-in backup/restore methods which basically import/export JSON objects:

# Backup
ssh portal config backup  > sshportal.bkp

# Restore
ssh portal config restore < sshportal.bkp

This method is particularly useful as it should be resistant against future DB schema changes (expected during development phase).

I suggest you to be careful during this development phase, and use an additional backup method, for example:

# sqlite dump
sqlite3 sshportal.db .dump > sshportal.sql.bkp

# or just the immortal cp
cp sshportal.db sshportal.db.bkp

Built-in shell

sshportal embeds a configuration CLI.

By default, the configuration user is the user starting the server for the first time. It fallbacks to root.

Each command can be run directly by using this syntax: ssh [email protected] <command> [args]:

ssh [email protected] host inspect toto

You can enter in interactive mode using this syntax: ssh [email protected]

See Documentation for the list of shell commands.

Healthcheck

By default, sshportal will return OK to anyone sshing using the healthcheck user without checking for authentication.

$ ssh healthcheck@localhost -p 2222
OK

the healtcheck user can be changed using the healthcheck-user option.

Alternatively, you can run the built-in healthcheck helper (requiring no ssh client nor ssh key):

Usage: sshportal healthcheck [--addr=host:port] [--wait] [--quiet]

$ sshportal healthcheck --addr=localhost:2222; echo $?
0

Wait for sshportal to be healthy, then connect

$ sshportal healthcheck --wait && ssh sshportal -l root
config>

Portal alias (.ssh/config)

Edit your ~/.ssh/config file (create it first if needed)

Host portal
  User      root       # or 'sshportal' if you use the packaged binary
  User      root       # or 'sshportal' if you use the packaged sshportal
  Port      2222       # portal port
  HostName  127.0.0.1  # portal hostname

# you can now run a shell using this:
ssh portal
# instead of this:
ssh localhost -p 2222 -l root

# or connect to hosts using this:
ssh hostname@portal
# instead of this:
ssh localhost -p 2222 -l hostname

Scaling

sshportal is stateless but relies on a database to store configuration and logs.

By default, sshportal uses a local sqlite database which isn't scalable by design.

You can run multiple instances of sshportal sharing the same MySQL database, using sshportal --db-conn=user:pass@host/dbname?parseTime=true --db-driver=mysql.

See examples/mysql.

Under the hood

Docker first (used in dev, tests, by the CI and in production)
Backed by (see dep graph):
- SSH
  - https://github.com/gliderlabs/ssh: SSH server made easy (well-designed golang library to build SSH servers)
  - https://godoc.org/golang.org/x/crypto/ssh: both client and server SSH protocol and helpers
- Database
  - https://github.com/jinzhu/gorm/: SQL orm
  - https://github.com/go-gormigrate/gormigrate: Database migration system
- Built-in shell
  - https://github.com/olekukonko/tablewriter: Ascii tables
  - https://github.com/asaskevich/govalidator: Valide user inputs
  - https://github.com/dustin/go-humanize: Human-friendly representation of technical data (time ago, bytes, ...)
  - https://github.com/mgutz/ansi: Terminal color helpers
  - https://github.com/urfave/cli: CLI flag parsing with subcommands support

Testing

Install golangci-lint and run this in project root:

golangci-lint run

Perform integration tests

cd ./examples/integration && make

Perform unit tests

go test

Name		Name	Last commit message	Last commit date
Latest commit History 640 Commits
.assets		.assets
.github		.github
examples		examples
helm/sshportal		helm/sshportal
internal/tools		internal/tools
packaging		packaging
pkg		pkg
.dockerignore		.dockerignore
.gitattributes		.gitattributes
.gitignore		.gitignore
.golangci.yml		.golangci.yml
.goreleaser.yml		.goreleaser.yml
AUTHORS		AUTHORS
CHANGELOG.md		CHANGELOG.md
Dockerfile		Dockerfile
LICENSE		LICENSE
README.md		README.md
go.mod		go.mod
go.sum		go.sum
healthcheck.go		healthcheck.go
main.go		main.go
server.go		server.go
testserver.go		testserver.go
testserver_unsupported.go		testserver_unsupported.go

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sshportal

IMPORTANT NOTE

Installation

Quick start

Features and limitations

Backup / Restore

Built-in shell

Healthcheck

Portal alias (.ssh/config)

Scaling

Under the hood

Testing

About

Releases 31

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alterway/sshportal

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sshportal

IMPORTANT NOTE

Installation

Quick start

Features and limitations

Backup / Restore

Built-in shell

Healthcheck

Portal alias (.ssh/config)

Scaling

Under the hood

Testing

About

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