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| layout | page_title | sidebar_current | description |
|---|---|---|---|
| docs | SSH Secret Backend | docs-secrets-ssh | The SSH secret backend for Vault generates signed SSH certificates, dynamic SSH keys or One-Time-Passwords. |
SSH Secret Backend
Name: ssh
Vault SSH backend tries to solve the problem of managing access to machine infrastructure by providing different ways to issue SSH credentials.
The backend issues in 3 types of credentials: CA signed keys, Dynamic keys and OTP keys. Read and carefully understand all the types before choosing the one which best suits your needs. In relation to the dynamic key and OTP key type, the CA key signing is the simplest and most powerful in terms of setup complexity and in terms of being platform agnostic.
This page will show a quick start for this backend. For detailed documentation
on every path, use vault path-help after mounting the backend.
I. CA Key Type
When using this type, an SSH CA signing key is generated or configured at the backend's mount. This key will be used to sign other SSH keys. The private half of the signing key always stays within Vault and the public half is exposed via the API. Each mount of this backend represents a unique signing key pair. It is recommended that the host keys and client keys are signed using different mounts of this backend.
Mount a backend's instance for signing host keys
vault mount -path ssh-host-signer ssh
Successfully mounted 'ssh' at 'ssh-host-signer'!
Mount a backend's instance for signing client keys
vault mount -path ssh-client-signer ssh
Successfully mounted 'ssh' at 'ssh-client-signer'!
Configure the host CA certificate
vault write -f ssh-host-signer/config/ca
Key Value
--- -----
public_key ssh-rsa
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
The returned host CA public key should be added to known_hosts file in all
the client machines with a @cert-authority *.domain prefix. The host CA
public key can also be retrieved using vault read ssh-host-signer/config/ca.
Configure the client CA certificate
vault write -f ssh-client-signer/config/ca
Key Value
--- -----
public_key ssh-rsa
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
The returned client CA public key should be added to TrustedUserCAKeys list
in sshd_config of the host machine. The client CA public key can also be
retrieved using vault read ssh-client-signer/config/ca.
Allow host certificate to have longer TTLs
vault mount-tune -max-lease-ttl=87600h ssh-host-signer
Successfully tuned mount 'ssh-host-signer'!
Create a role to sign host keys
vault write ssh-host-signer/roles/hostrole ttl=87600h allow_host_certificates=true key_type=ca
Success! Data written to: ssh-host-signer/roles/hostrole
Create a role to sign client keys
vault write ssh-client-signer/roles/clientrole allow_user_certificates=true ttl=5m key_type=ca
Success! Data written to: ssh-client-signer/roles/clientrole
Sign the host key
cat hostkey.pub | vault write -format=json ssh-host-signer/sign/hostrole public_key=- cert_type=host
Key Value
--- -----
serial_number 3746eb17371540d9
signed_key ssh-rsa-cert-v01@openssh.com
AAAAHHNzaC1yc2EtY2VydC12MDFAb3BlbnNzaC5jb20AAAAg1d4hqGnDjPvBFTGGDksRvaxkIrJ/cc0P4wVyk5A+NtUAAAADAQABAAABAQDKis3fESmPFS9cp7QYJRAsqvrM9w6GwHmrBp2DOUmTJ1szNDm0sbJGkmvMvmC0fbb4DkXbr8YPKk0srX8jRDCXLRtrZJs1jgDN/JVyJGR1pYwOItpeYSkoU42cjgRqEvdms30TvIEzsDhkhyOATTooi95J46GP6tczl5nPp2Zz7zVj8/yXechcM6GCs0x8epcK9UJfhpNvYrC3F7tnxbbLFkdM7AV0bTu1wND2rKTDeACbk3Xi5j9Ti4oQ0ma7aNOFrCO8gfiB4mBbAx4Y+j+FSDNuVWpQqkGBwqRp+E2hgGy4Ao+3zE89SwtnlziIgBwyecT7JTQ+X54Pn7ZBtK+BN0brFzcVQNkAAAACAAAATHZhdWx0LXRva2VuLTA0Mzk0M2MyZjFlYWNmNzBhOWQyNDhiZWE5Yzg0N2UzZDM5Yzc2ZTAyMmY5YzU3MzJkOTAyNDE1NzM2NzU4MWEAAAAAAAAAAFjPB8UAAAAAa5sK4wAAAAAAAAAAAAAAAAAAAhcAAAAHc3NoLXJzYQAAAAMBAAEAAAIBAMHuVtDi5vz/sBt+cXjOe0LE8aKNfN2jnQytTPQjVXP+f3ykE/KtQRw2oV4KvpCz2REvwnwG7jxb8O1LECJJwgiXPJ7O6Uf7DF1mcI3ezENSEVtNSixay1K3o/kFlsmwxOl8d+5hs57F7Bf2WPDrfp9StG1Tf/QSarYWQ5woS/2/vP5DB1qib7xHoK9EDQqK3TLKHoNcP4iM+c6aFgWg0fpmE9TbEn7szXq8ukKYfo47WSseUMr5lS9UoPZmN+Zt6ChgRX/0URNLNWdD+k6s/RJ3CmYaF6LtU7uFDBrrM5YhqHrpNhh1oiikcWFrrStk/JuWJkUCL8JxQ7s1iV2rtDa3LrxEqn4ibZE49tcsphzY349OFbBvEDXJDuyG+BLL8kRsBxhC4Msafq0Dqfmxem8Vwl76+V/vnD6Vpcg9RdNUevaDU7kivPC6emDTc9r4ppvweny6rrVd9N820LAdiv8rlg7busdykwD+AEqQ4WYFtwjdWVRuLbroeLIUA3PQkw5vNdLmEQab3Q168wPacQW9kdgfHiFdG2ijHsGHgIKPZ9Q9pOGe5O+/WEsGCvJbHANcvs7AcbHrB392lej/V8bUNFSi19Vwk/uTsUb0xQAHq05HZEK5cRpMXpu/e0Klux3PPPKGz9ohroh5hFXgdSjedbmD8hFP7oX8wt3rcKrnAAACDwAAAAdzc2gtcnNhAAACAHj5fKMW0KvWiVhZ0LQQUPLpBlgL3qeHic99x61mFGQdkgawhh5UjxsW/r3asPy3XI92QYHu6me8g3iTBqXTmM9u+CwCTnVkZD+pweRLqbC+w5FqfSi8qugOZWzQwa6dNkIMDOIx9CZD6Q1Mve6Bwpt4ziPdQNvZgjpAeYSyMgjpea6JBVP9SmLCv8efPnoTmPvSbMR2DQWXQz0+gi/dBzomc9UPOjSq6az10TIFcIxInNhZBlBo5Smk5403lZjLWxX/KvVVT/T19F/+2z5fPjMubYuZIvB0LbXSQmvcbFIaVX2MdOXkx1d4Iy4whmCqFHr/37WJz2FgaHsbI/R/EcC5maqLeyZzAq925g92QiNQ2bXqY2jeondkqPF3ZOVmKDC1hy1PjaVXuIhp6Wq5GEvXHjBNr8vk/WS0enaZvKRuY3h+cHqukQ3RhVIQ8kRq+wHdqytg4c2ijY7Qn9IAKUQb13cpWpH4VFRTAoVR3O5i4OwQ8BCZSQ3YgW4GK9lN29wKUc1rAb2d8gmIq5/lObs0FKpOXDgkF7jC2ilRodJkbLGRcPi2MEWLsSlXjC5p5iwwf9u02EmXzeTWL/R4HhH8j6Efdc9qobPymhFdbrNDhYnu4/TzqJtyIjuWdsMitfAxnJBYAN3xxPpL8lTvhw8gg7eXtbrmisPy69TdsXBf
Set the signed certificate as HostCertificate in the sshd_config in host
machine.
Sign the client key
cat clientkey.pub | vault write ssh-client-signer/sign/clientrole public_key=-
Key Value
--- -----
serial_number c73f26d2340276aa
signed_key ssh-rsa-cert-v01@openssh.com
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
Save the signed key in a file, say signed-client-cert.pub.
SSH into the host machine
ssh -i signed-client-cert.pub username@<IP of remote host>
username@<IP of remote host>:~$
II. One-Time-Password (OTP) Type
This backend type allows a Vault server to issue an OTP every time a client wants to SSH into a remote host, using a helper command on the remote host to perform verification.
An authenticated client requests credentials from the Vault server and, if authorized, is issued an OTP. When the client establishes an SSH connection to the desired remote host, the OTP used during SSH authentication is received by the Vault helper, which then validates the OTP with the Vault server. The Vault server then deletes this OTP, ensuring that it is only used once.
Since the Vault server is contacted during SSH connection establishment, every login attempt and the correlating Vault lease information is logged to the audit backend.
See Vault-SSH-Helper for details on the helper.
Drawbacks
The main concern with the OTP backend type is the remote host's connection to Vault; if compromised, an attacker could spoof the Vault server returning a successful request. This risk can be mitigated by using TLS for the connection to Vault and checking certificate validity; future enhancements to this backend may allow for extra security on top of what TLS provides.
Mount the backend
$ vault mount ssh
Successfully mounted 'ssh' at 'ssh'!
Create a Role
Create a role with the key_type parameter set to otp. All of the machines
represented by the role's CIDR list should have helper properly installed and
configured.
$ vault write ssh/roles/otp_key_role \
key_type=otp \
default_user=username \
cidr_list=x.x.x.x/y,m.m.m.m/n
Success! Data written to: ssh/roles/otp_key_role
Create a Credential
Create an OTP credential for an IP of the remote host that belongs to
otp_key_role.
$ vault write ssh/creds/otp_key_role ip=x.x.x.x
Key Value
lease_id ssh/creds/otp_key_role/73bbf513-9606-4bec-816c-5a2f009765a5
lease_duration 600
lease_renewable false
port 22
username username
ip x.x.x.x
key 2f7e25a2-24c9-4b7b-0d35-27d5e5203a5c
key_type otp
Establish an SSH session
$ ssh username@localhost
Password: <Enter OTP>
username@ip:~$
Automate it!
A single CLI command can be used to create a new OTP and invoke SSH with the correct parameters to connect to the host.
$ vault ssh -role otp_key_role username@x.x.x.x
OTP for the session is `b4d47e1b-4879-5f4e-ce5c-7988d7986f37`
[Note: Install `sshpass` to automate typing in OTP]
Password: <Enter OTP>
The OTP will be entered automatically using sshpass if it is installed.
$ vault ssh -role otp_key_role -strict-host-key-checking=no username@x.x.x.x
username@<IP of remote host>:~$
Note: sshpass cannot handle host key checking. Host key checking can be
disabled by setting -strict-host-key-checking=no.
III. Dynamic Key Type
When using this type, the administrator registers a secret key with appropriate
sudo privileges on the remote machines; for every authorized credential
request, Vault creates a new SSH key pair and appends the newly-generated
public key to the authorized_keys file for the configured username on the
remote host. Vault uses a configurable install script to achieve this.
The backend does not prompt for sudo passwords; the NOPASSWD option for
sudoers should be enabled at all remote hosts for the Vault administrative
user.
The private key returned to the user will be leased and can be renewed if desired. Once the key is given to the user, Vault will not know when it gets used or how many time it gets used. Therefore, Vault WILL NOT and cannot audit the SSH session establishments.
When the credential lease expires, Vault removes the secret key from the remote machine.
Drawbacks
The dynamic key type has several serious drawbacks:
- Audit logs are unreliable: Vault can only log when users request credentials, not when they use the given keys. If user A and user B both request access to a machine, and are given a lease valid for five minutes, it is impossible to know whether two accesses to that user account on the remote machine were A, A; A, B; B, A; or B, B.
- Generating dynamic keys consumes entropy: Unless equipped with a hardware entropy generating device, a machine can quickly run out of entropy when generating SSH keys. This will cause further requests for various Vault operations to stall until more entropy is available, which could take a significant amount of time, after which the next request for a new SSH key will use the generated entropy and cause stalling again.
Because of these drawbacks, the Vault team recommends use of the OTP type whenever possible. Care should be taken with respect to the above issues with any deployments using the dynamic key type.
sudo
In order to adjust the authorized_keys file for the desired user, Vault
connects via SSH to the remote machine as a separate user, and uses sudo to
gain the privileges required. An example sudoers file is shown below.
File: /etc/sudoers
# This is a sample sudoers statement; you should modify it
# as appropriate to satisfy your security needs.
vaultadmin ALL=(ALL)NOPASSWD: ALL
Configuration
Next, infrastructure configuration must be registered with Vault via roles. First, however, the shared secret key must be specified.
Mount the backend
$ vault mount ssh
Successfully mounted 'ssh' at 'ssh'!
Registering the shared secret key
Register a key with a name; this key must have administrative capabilities on the remote hosts.
$ vault write ssh/keys/dev_key \
key=@dev_shared_key.pem
Create a Role
Next, create a role. All of the machines contained within this CIDR block list should be accessible using the registered shared secret key.
$ vault write ssh/roles/dynamic_key_role \
key_type=dynamic \
key=dev_key \
admin_user=username \
default_user=username \
cidr_list=x.x.x.x/y
Success! Data written to: ssh/roles/dynamic_key_role
cidr_list is a comma separated list of CIDR blocks for which a role can
generate credentials. If this is empty, the role can only generate credentials
if it belongs to the set of zero-address roles.
Zero-address roles, configured via /ssh/config/zeroaddress endpoint, takes
comma separated list of role names that can generate credentials for any IP
address.
Use the install_script option to provide an install script if the remote
hosts do not resemble a typical Linux machine. The default script is compiled
into the Vault binary, but it is straight forward to specify an alternate. The
script takes three arguments which are explained in the comments.
To see the default, see linux_install_script.go
Create a credential
Create a dynamic key for an IP of the remote host that is covered by
dynamic_key_role's CIDR list.
$ vault write ssh/creds/dynamic_key_role ip=x.x.x.x
Key Value
lease_id ssh/creds/dynamic_key_role/8c4d2042-23bc-d6a8-42c2-6ff01cb83cf8
lease_duration 600
lease_renewable true
ip x.x.x.x
key -----BEGIN RSA PRIVATE KEY-----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WALNuiECgYEA8PM2Ob3XXKALF86PUewne4fCz9iixr/cIpvrEGrh9lyQRO8X5Jxb
ug38jEql4a574C6TSXfzxURza4P6lnfa0LvymmW0bhxZ5nev9kcAVnLKvpOUArTR
32k9bKXd6zp8Q9ZyVNwHRxcVs4YgwfJlcx8geC4o6YRiIjvcBQ9RVHkCgYEA87OK
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oXMfLSxZ1lmZiuUvAupKj/7RjJ0XyjSMfm1Zs81epWj+boVfM4amZNHVLIWgddmM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-----END RSA PRIVATE KEY-----
key_type dynamic
port 22
username username
Establish an SSH session
Save the key to a file (e.g. dyn_key.pem) and then use it to establish an SSH
session.
$ ssh -i dyn_key.pem username@<IP of remote host>
username@<IP of remote host>:~$
Automate it!
Creation of new key, saving to a file, and using it to establish an SSH session can all be done with a single Vault CLI command.
$ vault ssh -role dynamic_key_role username@<IP of remote host>
username@<IP of remote host>:~$
API
The SSH secret backend has a full HTTP API. Please see the SSH secret backend API for more details.