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explicit keytocard instructions
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drduh
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README.md
47
README.md
@ -33,7 +33,7 @@ To suggest an improvement, please send a pull request or open an [issue](https:/
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- [Export secret keys](#export-secret-keys)
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- [Revocation certificate](#revocation-certificate)
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- [Backup](#backup)
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- [Export public keys](#export-public-keys)
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- [Export public key](#export-public-key)
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- [Configure YubiKey](#configure-yubikey)
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* [Enable KDF](#enable-kdf)
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* [Change PIN](#change-pin)
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@ -822,10 +822,9 @@ List available secret keys:
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gpg -K
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```
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The output should display Certify, Signature, Encryption and Authentication keys, for example:
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The output will display Certify, Signature, Encryption and Authentication keys, for example:
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```console
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---------------------------------------
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sec rsa4096/0xF0F2CFEB04341FB5 2024-01-01 [C]
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Key fingerprint = 4E2C 1FA3 372C BA96 A06A C34A F0F2 CFEB 0434 1FB5
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uid [ultimate] YubiKey User <yubikey@example>
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@ -1071,9 +1070,9 @@ doas bioctl -d sd3
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See [OpenBSD FAQ#14](https://www.openbsd.org/faq/faq14.html#softraidCrypto) for more information.
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# Export public keys
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# Export public key
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**Important** Without the *public* key, it will **not** be possible to use GnuPG to encrypt, decrypt, nor sign messages. However, YubiKey may still be used for SSH authentication.
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**Important** Without the public key, it will **not** be possible to use GnuPG to decrypt and sign messages. However, YubiKey can still be used for SSH authentication.
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Create another partition on the portable storage device to store the public key, or reconnect networking and upload to a key server.
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@ -1183,29 +1182,7 @@ gpg/card> quit
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Insert YubiKey and use GnuPG to configure it:
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```console
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$ gpg --card-edit
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Reader ...........: Yubico Yubikey 4 OTP U2F CCID
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Application ID ...: D2760001240102010006055532110000
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Application type .: OpenPGP
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Version ..........: 3.4
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Manufacturer .....: Yubico
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Serial number ....: 05553211
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Name of cardholder: [not set]
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Language prefs ...: [not set]
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Salutation .......:
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URL of public key : [not set]
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Login data .......: [not set]
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Signature PIN ....: not forced
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Key attributes ...: rsa2048 rsa2048 rsa2048
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Max. PIN lengths .: 127 127 127
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PIN retry counter : 3 0 3
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Signature counter : 0
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KDF setting ......: off
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Signature key ....: [none]
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Encryption key....: [none]
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Authentication key: [none]
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General key info..: [none]
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gpg --card-edit
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```
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Enter administrative mode:
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@ -1314,17 +1291,19 @@ gpg/card> quit
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**Important** Transferring keys to YubiKey is a one-way operation. Verify backups were made before proceeding. `keytocard` converts the local, on-disk key into a stub, which means the on-disk copy is no longer usable to transfer to subsequent YubiKeys.
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The currently selected key(s) are indicated with an `*`. When transferring keys, only one subkey should be selected at a time.
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The currently selected key(s) are indicated with an `*`.
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When transferring keys, only one subkey should be selected at a time.
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```console
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gpg --edit-key $KEYID
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```
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The Certify key passphrase and Admin PIN will be prompted.
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The Certify key passphrase and Admin PIN are required to transfer keys.
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## Signature key
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Select and transfer the Signature key - `*` will appear next to the selected subkey (`ssb*`):
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Type `key 1` to select the first key and `keytocard` to transfer it, then `1` as the destination:
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```console
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gpg> key 1
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@ -1349,7 +1328,7 @@ Your selection? 1
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## Encryption key
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Type `key 1` again to deselect the first key and `key 2` to select the next key:
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Type `key 1` again to deselect the first key and `key 2` to select the next key, then `keytocard` to transfer it, then `2` as the destination:
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```console
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gpg> key 1
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@ -1375,7 +1354,7 @@ Your selection? 2
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## Authentication key
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Type `key 2` again to deselect the second key and `key 3` to select the third key:
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Type `key 2` again to deselect the second key and `key 3` to select the third key, then `keytocard` to transfer it, then `3` as the destination:
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```console
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gpg> key 2
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@ -2031,7 +2010,7 @@ For example, tmux does not have environment variables such as `$SSH_AUTH_SOCK` w
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### Use ssh-agent
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You should now be able to use `ssh -A remote` on the _local_ host to log into _remote_ host, and should then be able to use YubiKey as if it were connected to the remote host. For example, using e.g. `ssh-add -l` on that remote host should show the public key from the YubiKey (note `cardno:`). (If you don't want to have to remember to use `ssh -A`, you can use `ForwardAgent yes` in `~/.ssh/config`. As a security best practice, always use `ForwardAgent yes` only for a single `Hostname`, never for all servers.)
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You should now be able to use `ssh -A remote` on the _local_ host to log into _remote_ host, and should then be able to use YubiKey as if it were connected to the remote host. For example, using e.g. `ssh-add -l` on that remote host will show the public key from the YubiKey (`cardno:`). Always use `ForwardAgent yes` only for a single host, never for all servers.
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### Use S.gpg-agent.ssh
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