This change introduces a workaround for OpenSSH 7.x bug related to SHA-2 signed certificates. Teleport signs all certificates with SHA-2-512, which prevents us from connecting to older sshd. As a workaround, we will send the same certificate signed with SHA-2-512 (as we do right now) and SHA-1 if the first authentication fails. We always send the SHA-2 certificates first, so newer OpenSSH versions should always use SHA-2 certs as they do right now.
This commit upgrades the version of x/crypto we use, to the current latest
`go get -u golang.org/x/crypto`
We also replaced the deprecated variables and updated the tests to match the
current default KEX Algos
The x/crypto didn't support RSA-SHA2 algos, so we developed our own algorithm
signer. This is no longer the case, and after upgrading x/crypto to 20220518 we
can safely remove the custom code we have.
From OpenSSH 8.8+, it works if we explicitly add the older algorithm
Somthing like this: `./ssh -vvv -oPubkeyAcceptedAlgorithms=+ssh-rsa-cert-v01@openssh.comteleportadmin@moon.marco.mydemo`
* Added support for connecting API client through tunnel proxy and web proxy addresses (with identity file).
* Added concurrent dialing logic to dial several possible dialing combinations and seamlessly return the first client to connect.
* mfa: put device UUID in MFAVerified cert extensions
Instead of just a bool, add the device UUID. This will be used in audit
events when a session is started using MFA-issued certs.
* Add WithMFA to session-related audit events
Also extract a common function for parsing SSH certs.
This allows users to override the SHA2 signing algorithms we default to
now for compatibility with the (very) old OpenSSH versions.
For host and user certs, use the CA signing algo for their own
handshakes. This allows us to propagate the signing algo from auth
server everywhere else.
Motivation:
x/crypto/ssh defaults to using SHA-1 for signatures:
https://github.com/golang/crypto/blob/master/ssh/keys.go#L963-L982
Because Teleport uses RSA for user, host and CA keys, we end up with
SHA-1 by default.
SHA-1 is now considered weak and OpenSSH plans to deprecate it:
https://www.openssh.com/txt/release-8.3
Fix:
Wrap all RSA `ssh.Signer`s and override `SignWithAlgorithm` to
provide `SigAlgoRSASHA2512` if not otherwise specified. This will
only affect new certs, existing certs will use `SigAlgoRSA` until
rotated. For CA certs (e.g. exported with `tctl auth export`) users
might need to manually rotate.
Limited local testing with openssh 8.2 client and
`-oHostKeyAlgorithms=-ssh-rsa` confirms that this works with a new
cluster and fails with an old one.
This commit introduced mutual TLS authentication
for auth server API server.
Auth server multiplexes HTTP over SSH - existing
protocol and HTTP over TLS - new protocol
on the same listening socket.
Nodes and users authenticate with 2.5.0 Teleport
using TLS mutual TLS except backwards-compatibility
cases.
First part of addressing #1033 is ability to load credentials from the
credentials file(s).
This commit adds -i flag processing, i.e. a certificate can be fed via a
cert.file and used to login.
auth server. This is needed when you configure cluster from scratch and
all nodes including auth server spin up simultaneously.
* Add tctl tools to generate keys and certificates
+ Command "tctl authorities gen" generates public and private keypair.
+ Command "tctl authorities gencert" generates public and private keypair signed
by existng private key
+ Command "tctl authorities export" was modified to be able to export exisitng private
CA keys to local storage
All of these commands are hidden by default.
section "static configuration"
* Add ability to configure teleport from environment variable
Environment variable TELEPORT_CONFIG can contain base64 encoded
YAML file config file of the standard file format, so teleport will use it on start
* Add special secrets section to the config file
Section "secrets" was updated to support pre-configured trusted CA keys and pre-generated keys
* Add special rts hidden section to add support for provisioning
Jakub Nyckowski