openssh: import homebrew/dupes into core.

Formula/openssh.rb

@@ -0,0 +1,63 @@
+class Openssh < Formula
+  desc "OpenBSD freely-licensed SSH connectivity tools"
+  homepage "https://www.openssh.com/"
+
+  url "https://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz"
+  mirror "https://www.mirrorservice.org/pub/OpenBSD/OpenSSH/portable/openssh-7.5p1.tar.gz"
+  version "7.5p1"
+  sha256 "9846e3c5fab9f0547400b4d2c017992f914222b3fd1f8eee6c7dc6bc5e59f9f0"
+
+  bottle do
+    sha256 "c942ff58039548faeb3f3d4c491e9e620a2fde28393755b231b1a547dfb5c1a1" => :sierra
+    sha256 "7ec1b04d0d82c4f32a06455646ef1df505b54266e7351d90bd4270829dc5805c" => :el_capitan
+    sha256 "8ba916a853ff38db1273332ddf334f3203e541ff2700908ca5b9804c9ce1c585" => :yosemite
+  end
+
+  # Please don't resubmit the keychain patch option. It will never be accepted.
+  # https://github.com/Homebrew/homebrew-dupes/pull/482#issuecomment-118994372
+
+  depends_on "openssl"
+  depends_on "ldns" => :optional
+  depends_on "pkg-config" => :build if build.with? "ldns"
+
+  # Both these patches are applied by Apple.
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/patches/1860b0a74/openssh/patch-sandbox-darwin.c-apple-sandbox-named-external.diff"
+    sha256 "d886b98f99fd27e3157b02b5b57f3fb49f43fd33806195970d4567f12be66e71"
+  end
+
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/patches/d8b2d8c2/openssh/patch-sshd.c-apple-sandbox-named-external.diff"
+    sha256 "3505c58bf1e584c8af92d916fe5f3f1899a6b15cc64a00ddece1dc0874b2f78f"
+  end
+
+  # Patch for SSH tunnelling issues caused by launchd changes on Yosemite
+  patch do
+    url "https://raw.githubusercontent.com/Homebrew/patches/d8b2d8c2/OpenSSH/launchd.patch"
+    sha256 "df61404042385f2491dd7389c83c3ae827bf3997b1640252b018f9230eab3db3"
+  end
+
+  def install
+    ENV.append "CPPFLAGS", "-D__APPLE_SANDBOX_NAMED_EXTERNAL__"
+
+    args = %W[
+      --with-libedit
+      --with-kerberos5
+      --prefix=#{prefix}
+      --sysconfdir=#{etc}/ssh
+      --with-pam
+      --with-ssl-dir=#{Formula["openssl"].opt_prefix}
+    ]
+
+    args << "--with-ldns" if build.with? "ldns"
+
+    system "./configure", *args
+    system "make"
+    system "make", "install"
+
+    # This was removed by upstream with very little announcement and has
+    # potential to break scripts, so recreate it for now.
+    # Debian have done the same thing.
+    bin.install_symlink bin/"ssh" => "slogin"
+  end
+end