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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,136 @@ | ||
| package tssh | ||
|
|
||
| /* | ||
| MIT License | ||
| Copyright (c) 2023 Lonny Wong <[email protected]> | ||
| Copyright (c) 2023 [Contributors](https://github.com/trzsz/trzsz-ssh/graphs/contributors) | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "io" | ||
| "net" | ||
| "os" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| "golang.org/x/crypto/ssh" | ||
| "golang.org/x/crypto/ssh/agent" | ||
| ) | ||
|
|
||
| var ( | ||
| agentOnce sync.Once | ||
| agentClient agent.ExtendedAgent | ||
| ) | ||
|
|
||
| func getAgentAddr(args *sshArgs) string { | ||
| if addr := getOptionConfig(args, "IdentityAgent"); addr != "" { | ||
| if strings.ToLower(addr) == "none" { | ||
| return "" | ||
| } | ||
| return addr | ||
| } | ||
| if addr := os.Getenv("SSH_AUTH_SOCK"); addr != "" { | ||
| return addr | ||
| } | ||
| if addr := defaultAgentAddr; addr != "" && isFileExist(addr) { | ||
| return addr | ||
| } | ||
| return "" | ||
| } | ||
|
|
||
| func getAgentClient(args *sshArgs) agent.ExtendedAgent { | ||
| agentOnce.Do(func() { | ||
| addr := resolveHomeDir(getAgentAddr(args)) | ||
| if addr == "" { | ||
| debug("ssh agent address is not set") | ||
| return | ||
| } | ||
|
|
||
| conn, err := dialAgent(addr) | ||
| if err != nil { | ||
| debug("dial ssh agent [%s] failed: %v", addr, err) | ||
| return | ||
| } | ||
|
|
||
| agentClient = agent.NewClient(conn) | ||
| debug("new ssh agent client [%s] success", addr) | ||
|
|
||
| cleanupAfterLogined = append(cleanupAfterLogined, func() { | ||
| conn.Close() | ||
| agentClient = nil | ||
| }) | ||
| }) | ||
| return agentClient | ||
| } | ||
|
|
||
| const channelType = "[email protected]" | ||
|
|
||
| func forwardToRemote(client *ssh.Client, addr string) error { | ||
| channels := client.HandleChannelOpen(channelType) | ||
| if channels == nil { | ||
| return fmt.Errorf("agent: already have handler for %s", channelType) | ||
| } | ||
| conn, err := dialAgent(addr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| conn.Close() | ||
|
|
||
| go func() { | ||
| for ch := range channels { | ||
| channel, reqs, err := ch.Accept() | ||
| if err != nil { | ||
| continue | ||
| } | ||
| go ssh.DiscardRequests(reqs) | ||
| go forwardAgentRequest(channel, addr) | ||
| } | ||
| }() | ||
| return nil | ||
| } | ||
|
|
||
| func forwardAgentRequest(channel ssh.Channel, addr string) { | ||
| conn, err := dialAgent(addr) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| var wg sync.WaitGroup | ||
| wg.Add(2) | ||
| go func() { | ||
| _, _ = io.Copy(conn, channel) | ||
| if unixConn, ok := conn.(*net.UnixConn); ok { | ||
| _ = unixConn.CloseWrite() | ||
| } | ||
| wg.Done() | ||
| }() | ||
| go func() { | ||
| _, _ = io.Copy(channel, conn) | ||
| _ = channel.CloseWrite() | ||
| wg.Done() | ||
| }() | ||
|
|
||
| wg.Wait() | ||
| conn.Close() | ||
| channel.Close() | ||
| } |
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