workingdir

Working Directory plugin for sshpiperd

Working Dir is a /home-like directory. sshpiperd read files from workingdir/[username]/ to know upstream's configuration.

e.g.

workingdir tree

.
├── github
│   └── sshpiper_upstream
└── linode
    └── sshpiper_upstream

when ssh sshpiper_host -l github, sshpiper reads workingdir/github/sshpiper_upstream and the connect to the upstream.

Usage

sshpiperd workingdir --root /var/sshpiper

options (allow supported read from environments)

--allow-baduser-name  allow bad username (default: false) [$SSHPIPERD_WORKINGDIR_ALLOWBADUSERNAME]
--no-check-perm       disable 0400 checking (default: false) [$SSHPIPERD_WORKINGDIR_NOCHECKPERM]
--no-password-auth    disable password authentication and only use public key authentication (default: false) [$SSHPIPERD_WORKINGDIR_NOPASSWORD_AUTH]
--root value          path to root working directory (default: "/var/sshpiper") [$SSHPIPERD_WORKINGDIR_ROOT]
--strict-hostkey      upstream host public key must be in known_hosts file, otherwise drop the connection (default: false) [$SSHPIPERD_WORKINGDIR_STRICTHOSTKEY]

User files

These file MUST NOT be accessible to group or other. (chmod og-rwx filename)

• sshpiper_upstream

  • line starts with # are treated as comment
  • only the first not comment line will be parsed
  • if no port was given, 22 will be used as default
  • if user@ was defined, username to upstream will be the mapped one

# comment
[user@]upstream[:22]

e.g. 

[email protected]

google.com:12345

• authorized_keys

  OpenSSH format authorized_keys (see ~/.ssh/authorized_keys). downstream's public key must be in this file to get verified in order to use id_rsa to login to upstream.

• id_rsa

  RSA key for upstream.

• known_hosts

  when --strict-hostkey is set, upstream server's public key must present in known_hosts

Recursive mode (--recursive-search)

--recursive-search will search all sub directories of the username directory to find the downstream key in authorized_keys file.

├── git
│   ├── bitbucket
│   │   └── sshpiper_upstream
│   ├── github
│   │   ├── authorized_keys
│   │   ├── id_rsa
│   │   └── sshpiper_upstream
│   └── gitlab
│       └── sshpiper_upstream
├── linode....

TOTP

--check-totp will check the TOTP 2FA before connecting to the upstream, compatible with all RFC6238 authenticator, for example: google authenticator, azure authenticator.

the secret should be stored in totp file in working directory. for example:

/var/sshpiper/username/totp

FAQ

• Q: why sshpiperd still asks for password even I disabled password auth in upstream (different behavior from v0)

  A: you may want --no-password-auth, see #97