upstream: Fill in missing man page bits for U2F security key support:

Mention the new key types, the ~/.ssh/id_ecdsa_sk file, ssh's
SecurityKeyProvider keyword, the SSH_SK_PROVIDER environment variable,
and ssh-keygen's new -w and -x options.

Copy the ssh-sk-helper man page from ssh-pkcs11-helper with minimal
substitutions.

ok djm@

OpenBSD-Commit-ID: ef2e8f83d0c0ce11ad9b8c28945747e5ca337ac4

1 files changed, 6 insertions, 3 deletions

diff --git a/ssh-add.1 b/ssh-add.1
index 9b90257b4..73b91d945 100644
--- a/ssh-add.1
+++ b/ssh-add.1
@@ -1,4 +1,4 @@
-.\"     $OpenBSD: ssh-add.1,v 1.71 2019/11/01 00:52:35 jmc Exp $
+.\"     $OpenBSD: ssh-add.1,v 1.72 2019/11/07 08:38:38 naddy Exp $
 .\"
 .\" Author: Tatu Ylonen <ylo@cs.hut.fi>
 .\" Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
@@ -35,7 +35,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: November 1 2019 $
+.Dd $Mdocdate: November 7 2019 $
 .Dt SSH-ADD 1
 .Os
 .Sh NAME
@@ -63,6 +63,7 @@ When run without arguments, it adds the files
 .Pa ~/.ssh/id_rsa ,
 .Pa ~/.ssh/id_dsa ,
 .Pa ~/.ssh/id_ecdsa ,
+.Pa ~/.ssh/id_ecdsa_sk ,
 and
 .Pa ~/.ssh/id_ed25519 .
 After loading a private key,
@@ -135,7 +136,7 @@ Be quiet after a successful operation.
 .It Fl S Ar provider
 Specifies a path to a security key provider library that will be used when
 adding any security key-hosted keys, overriding the default of using the
-.Ev "SSH_SK_PROVIDER"
+.Ev SSH_SK_PROVIDER
 environment variable to specify a provider.
 .It Fl s Ar pkcs11
 Add keys provided by the PKCS#11 shared library
@@ -205,6 +206,8 @@ hardware security keys.
 Contains the DSA authentication identity of the user.
 .It Pa ~/.ssh/id_ecdsa
 Contains the ECDSA authentication identity of the user.
+.It Pa ~/.ssh/id_ecdsa_sk
+Contains the security key-hosted ECDSA authentication identity of the user.
 .It Pa ~/.ssh/id_ed25519
 Contains the Ed25519 authentication identity of the user.
 .It Pa ~/.ssh/id_rsa