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split-ssh: use "ssh-add -c" to get notified when key is used

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Still keep a note that it has not yet (to my knowledge) been verified
whether it addresses all problems mentionned about not being notified.
This commit is contained in:
Yann Dirson 2021-11-08 21:34:48 +01:00
parent fb3cb58304
commit 3f39b53281
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1 changed files with 21 additions and 14 deletions
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35
docs/configuration/split-ssh.md
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@ -41,6 +41,20 @@ Skip the first step if you don't wish to create another vault.
## Setting up SSH
Install `ssh-askpass` in the template of your `vault` VM. It will be
used by `ssh-agent` to ask for confirmation, for keys added using
`ssh-add -c`.
For Fedora templates:<br/>
```
[user@fedora-32 ~]$ sudo dnf install openssh-askpass
```
For Debian templates:<br/>
```
user@debian-10:~$ sudo apt-get install ssh-askpass-gnome
```
Perform the next steps in the AppVM `vault`.
1. Generate an SSH key pair.
@ -100,7 +114,7 @@ If you still want to encrypt your keys you must refer to the [Securing Your Priv
```shell_prompt
[Desktop Entry]
Name=ssh-add
Exec=ssh-add
Exec=ssh-add -c
Type=Application
```
@ -236,6 +250,8 @@ Please note that since `ssh-askpass` prompt is displayed on `vault` VM boot, it
### Using the Built-in Password Utility and `ssh-askpass`
You should have added `ssh-askpass` to your vault template earlier when [setting up SSH](#setting-up-ssh).
1. Either add a password to an existing private key with `ssh-keygen -p` or directly create a key pair with a password (enter password when prompted during the creation process, see [above](#setting-up-ssh)).
Note that the location and name of your private key may differ.
@ -248,18 +264,7 @@ Note that the location and name of your private key may differ.
Your identification has been saved with the new passphrase.
```
2. Install `ssh-askpass` in the template of your `vault` VM.
For Fedora templates:<br/>
```
[user@fedora-32 ~]$ sudo dnf install openssh-askpass
```
For Debian templates:<br/>
```
user@debian-10:~$ sudo apt-get install ssh-askpass-gnome
```
3. Shutdown the template and restart your `vault` VM.
2. Shutdown the template and restart your `vault` VM.
With this configuration you'll be prompted for entering your password every time you start your vault VM to be able to make use of your SSH key.
@ -372,7 +377,9 @@ If you're getting an error (e.g. `error fetching identities: communication with
* It is possible for a malicious VM to hold onto an ssh-agent connection for more than one use.
Therefore, if you authorize usage once, assume that a malicious VM could then use it many more times.
In this case, though, the SSH Agent will continue to protect your private keys; only usage of it would be available to the malicious VM until it is shut down.
* It doesn’t solve the problem of allowing the user to know what is requested before the operation gets approved.
* It is still to be fully verified if solve the problem of allowing the user to know what is requested before the operation gets approved is properly solved by either:
* configuring the vault to use `ssh-add -c` as described above
* configuring KeepassXC to "Require user confirmation when this key is used"
Want more Qubes split magic?
Check out [Split-GPG][Split-GPG].