accounts/scwallet: flag to specify path to smartcard daemon (#19439)

* accounts/scwallet: Add a switch to enable smartcard support

* accounts: change the meaning of the switch

* disable card support in windows until tested
* only activate account if pcscd socket file is present
* the switch is now the path to the socket file

* accounts/scwallet: holiman's review feedback

* accounts/scwallet: send the path to go-pcsclite

* accounts/scwallet: add default, per platform path

* accounts/scwallet: fix error log warning

* accounts/scwallet: update pcsc lib to latest

* accounts/scwallet: use default path from pcsclite

* scwallet: forgot to change switch name

* cmd: minor style cleanups (error handling first, then happy path)

vendor/github.com/gballet/go-libpcsclite/doc.go

@@ -61,8 +61,6 @@ const (
 	SCardPowever    = 0x0010 /* Card is powered */
 	SCardNegotiable = 0x0020 /* Ready for PTS */
 	SCardSpecific   = 0x0040 /* PTS has been set */
-
-	PCSCDSockName = "/run/pcscd/pcscd.comm"
 )
 
 // List of commands to send to the daemon

vendor/github.com/gballet/go-libpcsclite/doc_bsd.go

@@ -0,0 +1,35 @@
+// BSD 3-Clause License
+//
+// Copyright (c) 2019, Guillaume Ballet
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice, this
+//   list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// * Neither the name of the copyright holder nor the names of its
+//   contributors may be used to endorse or promote products derived from
+//   this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// +build dragonfly darwin freebsd netbsd openbsd solaris
+
+package pcsc
+
+const PCSCDSockName string = "/var/run/pcscd/pcscd.comm"

vendor/github.com/gballet/go-libpcsclite/doc_linux.go

@@ -0,0 +1,35 @@
+// BSD 3-Clause License
+//
+// Copyright (c) 2019, Guillaume Ballet
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice, this
+//   list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// * Neither the name of the copyright holder nor the names of its
+//   contributors may be used to endorse or promote products derived from
+//   this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// +build linux
+
+package pcsc
+
+const PCSCDSockName string = "/run/pcscd/pcscd.comm"

vendor/github.com/gballet/go-libpcsclite/doc_windows.go

@@ -0,0 +1,35 @@
+// BSD 3-Clause License
+//
+// Copyright (c) 2019, Guillaume Ballet
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice, this
+//   list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// * Neither the name of the copyright holder nor the names of its
+//   contributors may be used to endorse or promote products derived from
+//   this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// +build windows
+
+package pcsc
+
+const PCSCDSockName string = ""

vendor/github.com/gballet/go-libpcsclite/msg.go

@@ -62,7 +62,7 @@ func messageSendWithHeader(command uint32, conn net.Conn, data []byte) error {
 	return err
 }
 
-// ClientSetupSession prepares a communication channel for the client to talk to the server.
+// clientSetupSession prepares a communication channel for the client to talk to the server.
 // This is called by the application to create a socket for local IPC with the
 // server. The socket is associated to the file \c PCSCLITE_CSOCK_NAME.
 /*
@@ -73,6 +73,10 @@ func messageSendWithHeader(command uint32, conn net.Conn, data []byte) error {
  * @retval -1 The socket can not open a connection.
  * @retval -1 Can not set the socket to non-blocking.
  */
-func clientSetupSession() (net.Conn, error) {
-	return net.Dial("unix", PCSCDSockName)
+func clientSetupSession(daemonPath string) (net.Conn, error) {
+	path := PCSCDSockName
+	if len(daemonPath) > 0 {
+		path = daemonPath
+	}
+	return net.Dial("unix", path)
 }

vendor/github.com/gballet/go-libpcsclite/winscard.go

@@ -56,10 +56,10 @@ type Client struct {
 // EstablishContext asks the PCSC daemon to create a context
 // handle for further communication with connected cards and
 // readers.
-func EstablishContext(scope uint32) (*Client, error) {
+func EstablishContext(path string, scope uint32) (*Client, error) {
 	client := &Client{}
 
-	conn, err := clientSetupSession()
+	conn, err := clientSetupSession(path)
 	if err != nil {
 		return nil, err
 	}