ssh: enable FIDO/U2F keys

Description of FIDO/U2F support (from OpenSSH 8.2 release notes,
https://www.openssh.com/txt/release-8.2):

  This release adds support for FIDO/U2F hardware authenticators to
  OpenSSH. U2F/FIDO are open standards for inexpensive two-factor
  authentication hardware that are widely used for website
  authentication.  In OpenSSH FIDO devices are supported by new public
  key types "ecdsa-sk" and "ed25519-sk", along with corresponding
  certificate types.

  ssh-keygen(1) may be used to generate a FIDO token-backed key, after
  which they may be used much like any other key type supported by
  OpenSSH, so long as the hardware token is attached when the keys are
  used. FIDO tokens also generally require the user explicitly
  authorise operations by touching or tapping them.

  Generating a FIDO key requires the token be attached, and will
  usually require the user tap the token to confirm the operation:

    $ ssh-keygen -t ecdsa-sk -f ~/.ssh/id_ecdsa_sk
    Generating public/private ecdsa-sk key pair.
    You may need to touch your security key to authorize key generation.
    Enter file in which to save the key (/home/djm/.ssh/id_ecdsa_sk):
    Enter passphrase (empty for no passphrase):
    Enter same passphrase again:
    Your identification has been saved in /home/djm/.ssh/id_ecdsa_sk
    Your public key has been saved in /home/djm/.ssh/id_ecdsa_sk.pub

  This will yield a public and private key-pair. The private key file
  should be useless to an attacker who does not have access to the
  physical token. After generation, this key may be used like any
  other supported key in OpenSSH and may be listed in authorized_keys,
  added to ssh-agent(1), etc. The only additional stipulation is that
  the FIDO token that the key belongs to must be attached when the key
  is used.

To enable FIDO/U2F support, this change regenerates ssh_namespace.h,
adds ssh-sk-helper, and sets ENABLE_SK_INTERNAL (unless building
WITHOUT_USB).

devd integration is not included in this change, and is under
investigation for the base system.  In the interim the security/u2f-devd
port can be installed to provide appropriate devd rules.

Reviewed by:	delphij, kevans
Relnotes:	Yes
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32509

1 files changed, 12 insertions, 0 deletions

diff --git a/crypto/openssh/ssh_namespace.h b/crypto/openssh/ssh_namespace.h
index 2c2060567460..94a391ee5f45 100644
--- a/crypto/openssh/ssh_namespace.h
+++ b/crypto/openssh/ssh_namespace.h
@@ -87,6 +87,10 @@
 #define chacha_encrypt_bytes			Fssh_chacha_encrypt_bytes
 #define chacha_ivsetup				Fssh_chacha_ivsetup
 #define chacha_keysetup				Fssh_chacha_keysetup
+#define chachapoly_crypt			Fssh_chachapoly_crypt
+#define chachapoly_free				Fssh_chachapoly_free
+#define chachapoly_get_length			Fssh_chachapoly_get_length
+#define chachapoly_new				Fssh_chachapoly_new
 #define chan_ibuf_empty				Fssh_chan_ibuf_empty
 #define chan_is_dead				Fssh_chan_is_dead
 #define chan_mark_dead				Fssh_chan_mark_dead
@@ -553,8 +557,10 @@
 #define ssh_dss_sign				Fssh_ssh_dss_sign
 #define ssh_dss_verify				Fssh_ssh_dss_verify
 #define ssh_ecdsa_sign				Fssh_ssh_ecdsa_sign
+#define ssh_ecdsa_sk_verify			Fssh_ssh_ecdsa_sk_verify
 #define ssh_ecdsa_verify			Fssh_ssh_ecdsa_verify
 #define ssh_ed25519_sign			Fssh_ssh_ed25519_sign
+#define ssh_ed25519_sk_verify			Fssh_ssh_ed25519_sk_verify
 #define ssh_ed25519_verify			Fssh_ssh_ed25519_verify
 #define ssh_err					Fssh_ssh_err
 #define ssh_fetch_identitylist			Fssh_ssh_fetch_identitylist
@@ -871,6 +877,12 @@
 #define sshpkt_start				Fssh_sshpkt_start
 #define sshpkt_vfatal				Fssh_sshpkt_vfatal
 #define sshsigdie				Fssh_sshsigdie
+#define sshsk_add_option			Fssh_sshsk_add_option
+#define sshsk_enroll				Fssh_sshsk_enroll
+#define sshsk_key_from_response			Fssh_sshsk_key_from_response
+#define sshsk_load_resident			Fssh_sshsk_load_resident
+#define sshsk_open				Fssh_sshsk_open
+#define sshsk_sign				Fssh_sshsk_sign
 #define start_progress_meter			Fssh_start_progress_meter
 #define stdfd_devnull				Fssh_stdfd_devnull
 #define stop_progress_meter			Fssh_stop_progress_meter