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pamgpgr
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Use TouchID to Authenticate Sudo on macOS
Self plug, but here's a PAM module I made for using gpg for login: https://gitlab.com/rendaw/pamgpgr . I've been using it for a couple years for sudo I think (yubikey).
The code is fairly small so it can be an example for doing other PAM things too.
secretive
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GitHub Passkeys are generally available
Secretive might be what you're looking for: https://github.com/maxgoedjen/secretive
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Zero Effort Private Key Compromise: Abusing SSH-Agent for Lateral Movement
Good find! I was always curious how this worked.
I'm a big fan of tools like secretive[1] that can help solve this problem by using biometrics to shift the UX/security trade-off and thus make it feasible to always require some kind of authentication to sign a token with a key.
I'm not aware of any tools that do the same for Linux, and a quick Google search doesn't turn up much[2]. It does look like you can at least get a notification[3], though.
This could provide another layer of protection on the user's endpoint device in addition the network monitoring called out in the article. Defense in depth, and all that.
[1] https://github.com/maxgoedjen/secretive
[2] https://unix.stackexchange.com/questions/705144/unlock-an-ss...
[3] https://www.insecure.ws/2013/09/25/ssh-agent-notification.ht...
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Tell HN: 1Password 8.10.8 update corrupted data
https://github.com/maxgoedjen/secretive
> Secretive is an app for storing and managing SSH keys in the Secure Enclave
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Software Developer Mac Apps
Secretive, which replaces painfully managing SSH keys from the command line / editor. Getting a Touch ID prompt is so much better, though migrating computers will suck.
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SSH keys setup, use, and proper OpSec
consider using a higher-security setup. Secretive is an SSH agent for MacOS that stores keys within the host's secure enclave, where they can't be copied off, and can optionally require touchid validation before the key is used. This way, if you forward it the key to an compromised host and an attacker tries to use them, it'll still require a fingerprint (but, balance it with the fact that Secretive doesn't have nearly as many eyeballs checking it, yet!). Likewise, yubikeys can be setup to store SSH keys inside them and require touch to use.
- Secretive: Store SSH Keys in the Secure Enclave
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Russhian Roulette: 1/6 chance of posting your SSH private key on pastebin
You can store them in the Secure Enclave on OSX and require TouchID to use the key for signing.
See: https://github.com/maxgoedjen/secretive
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Use TouchID to Authenticate Sudo on macOS
Not exactly connected but the same crowd interested in this topic may also be interested in this tool to store SSH private keys in the Secure Enclave, kind of like what can be done with a YubiKey:
https://github.com/maxgoedjen/secretive
I've been looking for something like this for 3-4 years but only found it six months ago (in an HN thread). I use separate keys for every use case, and now know every time a key is used for any purpose, whether it's connecting to source control or my text editor is connecting to a remote VM.
Only thing I haven't figured out is how to do git signatures with these sorts of keys, but I haven't debugged it at all.
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A sane SSH(1) key management example
On Macs, Secretive [0] is great. It creates keys in the secret enclave, from where they can't be read, only used for signing requests. TouchID authorisation is optional but it's so quick and easy that I keep it on for all keys.
It can also use Smart Cards (Yubikeys are called out by name in the readme).
A forwarded agent will have the same level of security, meaning that if the forwarded agent needs to use a key in Secretive, it will have to be authorised locally - and even if TouchID is disabled, you are notified if a key is used.
[0] https://github.com/maxgoedjen/secretive/
What are some alternatives?
dotfiles.nix - My dotfiles in NIX
sekey - Use Touch ID / Secure Enclave for SSH Authentication!
toucli - Use TouchID and the Secure Enclave to encrypt data from the commandline.
YubiKey-Guide - Guide to using YubiKey for GnuPG and SSH
pam-watchid - PAM plugin module that allows the Apple Watch to be used for authentication
openssh-sk-winhello - A helper for OpenSSH to interact with FIDO2 and U2F security keys through native Windows Hello API
pam_wtid - Patch for Apple's pam_tid PAM Touch ID module to add sudo watch authentication
Vault - A tool for secrets management, encryption as a service, and privileged access management
Win32-OpenSSH - Win32 port of OpenSSH
vault-plugin-secrets-onepasswor
howdy - 🛡️ Windows Hello™ style facial authentication for Linux
rust-u2f - U2F security token emulator written in Rust