Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
communicator/ssh: Add support SSH over HTTP Proxy (#30274)
Terraform's remote-exec provision hangs out when it execs on HTTP Proxy bacause it dosen't support SSH over HTTP Proxy. This commits enables Terraform's remote-exec to support SSH over HTTP Proxy. * adds `proxy_*` fields to `connection` which add configuration for a proxy host * if `proxy_host` set, connect to that proxy host via CONNECT method, then make the SSH connection to `host` or `bastion_host`
- Loading branch information
Showing
7 changed files
with
337 additions
and
6 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,152 @@ | ||
| package ssh | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "fmt" | ||
| "net" | ||
| "net/http" | ||
| "net/url" | ||
| "time" | ||
|
|
||
| "golang.org/x/net/proxy" | ||
| ) | ||
|
|
||
| // Dialer implements for SSH over HTTP Proxy. | ||
| type proxyDialer struct { | ||
| proxy proxyInfo | ||
| // forwarding Dialer | ||
| forward proxy.Dialer | ||
| } | ||
|
|
||
| type proxyInfo struct { | ||
| // HTTP Proxy host or host:port | ||
| host string | ||
| // HTTP Proxy scheme | ||
| scheme string | ||
| // An immutable encapsulation of username and password details for a URL | ||
| userInfo *url.Userinfo | ||
| } | ||
|
|
||
| func newProxyInfo(host, scheme, username, password string) *proxyInfo { | ||
| p := &proxyInfo{ | ||
| host: host, | ||
| scheme: scheme, | ||
| } | ||
|
|
||
| p.userInfo = url.UserPassword(username, password) | ||
|
|
||
| if p.scheme == "" { | ||
| p.scheme = "http" | ||
| } | ||
|
|
||
| return p | ||
| } | ||
|
|
||
| func (p *proxyInfo) url() *url.URL { | ||
| return &url.URL{ | ||
| Scheme: p.scheme, | ||
| User: p.userInfo, | ||
| Host: p.host, | ||
| } | ||
| } | ||
|
|
||
| func (p *proxyDialer) Dial(network, addr string) (net.Conn, error) { | ||
| // Dial the proxy host | ||
| c, err := p.forward.Dial(network, p.proxy.host) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| err = c.SetDeadline(time.Now().Add(15 * time.Second)) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| // Generate request URL to host accessed through the proxy | ||
| reqUrl := &url.URL{ | ||
| Scheme: "", | ||
| Host: addr, | ||
| } | ||
|
|
||
| // Create a request object using the CONNECT method to instruct the proxy server to tunnel a protocol other than HTTP. | ||
| req, err := http.NewRequest("CONNECT", reqUrl.String(), nil) | ||
| if err != nil { | ||
| c.Close() | ||
| return nil, err | ||
| } | ||
|
|
||
| // If http proxy requires authentication, configure settings for basic authentication. | ||
| if p.proxy.userInfo.String() != "" { | ||
| username := p.proxy.userInfo.Username() | ||
| password, _ := p.proxy.userInfo.Password() | ||
| req.SetBasicAuth(username, password) | ||
| req.Header.Add("Proxy-Authorization", req.Header.Get("Authorization")) | ||
| } | ||
|
|
||
| // Do not close the connection after sending this request and reading its response. | ||
| req.Close = false | ||
|
|
||
| // Writes the request in the form expected by an HTTP proxy. | ||
| err = req.Write(c) | ||
| if err != nil { | ||
| c.Close() | ||
| return nil, err | ||
| } | ||
|
|
||
| res, err := http.ReadResponse(bufio.NewReader(c), req) | ||
|
|
||
| if err != nil { | ||
| res.Body.Close() | ||
| c.Close() | ||
| return nil, err | ||
| } | ||
|
|
||
| res.Body.Close() | ||
|
|
||
| if res.StatusCode != http.StatusOK { | ||
| c.Close() | ||
| return nil, fmt.Errorf("Connection Error: StatusCode: %d", res.StatusCode) | ||
| } | ||
|
|
||
| return c, nil | ||
| } | ||
|
|
||
| // NewHttpProxyDialer generate Http Proxy Dialer | ||
| func newHttpProxyDialer(u *url.URL, forward proxy.Dialer) (proxy.Dialer, error) { | ||
| var proxyUserName, proxyPassword string | ||
| if u.User != nil { | ||
| proxyUserName = u.User.Username() | ||
| proxyPassword, _ = u.User.Password() | ||
| } | ||
|
|
||
| pd := &proxyDialer{ | ||
| proxy: *newProxyInfo(u.Host, u.Scheme, proxyUserName, proxyPassword), | ||
| forward: forward, | ||
| } | ||
|
|
||
| return pd, nil | ||
| } | ||
|
|
||
| // RegisterDialerType register schemes used by `proxy.FromURL` | ||
| func RegisterDialerType() { | ||
| proxy.RegisterDialerType("http", newHttpProxyDialer) | ||
| proxy.RegisterDialerType("https", newHttpProxyDialer) | ||
| } | ||
|
|
||
| // NewHttpProxyConn create a connection to connect through the proxy server. | ||
| func newHttpProxyConn(p *proxyInfo, targetAddr string) (net.Conn, error) { | ||
| pd, err := proxy.FromURL(p.url(), proxy.Direct) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| proxyConn, err := pd.Dial("tcp", targetAddr) | ||
|
|
||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return proxyConn, err | ||
| } |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Oops, something went wrong.