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103 lines
2.5 KiB
103 lines
2.5 KiB
//
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// Copyright (c) 2014 David Mzareulyan
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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// and associated documentation files (the "Software"), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge, publish, distribute,
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// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
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// is furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all copies or substantial
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// portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// +build windows
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package sshagent
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import (
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"errors"
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"io"
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"net"
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"sync"
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"github.com/Microsoft/go-winio"
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"golang.org/x/crypto/ssh/agent"
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)
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const (
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sshAgentPipe = `\\.\pipe\openssh-ssh-agent`
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)
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// Available returns true if Pageant is running
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func Available() bool {
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if pageantWindow() != 0 {
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return true
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}
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conn, err := winio.DialPipe(sshAgentPipe, nil)
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if err != nil {
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return false
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}
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conn.Close()
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return true
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}
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// New returns a new agent.Agent and the (custom) connection it uses
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// to communicate with a running pagent.exe instance (see README.md)
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func New() (agent.Agent, net.Conn, error) {
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if pageantWindow() != 0 {
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return agent.NewClient(&conn{}), nil, nil
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}
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conn, err := winio.DialPipe(sshAgentPipe, nil)
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if err != nil {
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return nil, nil, errors.New(
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"SSH agent requested, but could not detect Pageant or Windows native SSH agent",
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)
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}
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return agent.NewClient(conn), nil, nil
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}
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type conn struct {
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sync.Mutex
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buf []byte
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}
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func (c *conn) Close() {
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c.Lock()
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defer c.Unlock()
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c.buf = nil
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}
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func (c *conn) Write(p []byte) (int, error) {
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c.Lock()
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defer c.Unlock()
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resp, err := query(p)
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if err != nil {
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return 0, err
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}
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c.buf = append(c.buf, resp...)
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return len(p), nil
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}
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func (c *conn) Read(p []byte) (int, error) {
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c.Lock()
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defer c.Unlock()
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if len(c.buf) == 0 {
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return 0, io.EOF
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}
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n := copy(p, c.buf)
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c.buf = c.buf[n:]
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return n, nil
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}
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