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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,150 @@ | ||
| /* | ||
| Copyright 2022 Gravitational, Inc. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
|
|
||
| package client | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "context" | ||
| "net" | ||
| "net/http" | ||
| "net/url" | ||
| "os" | ||
| "strings" | ||
|
|
||
| "github.com/gravitational/teleport/api/constants" | ||
| "github.com/gravitational/trace" | ||
| log "github.com/sirupsen/logrus" | ||
| ) | ||
|
|
||
| // DialProxy creates a connection to a server via an HTTP Proxy. | ||
| func DialProxy(ctx context.Context, proxyAddr, addr string) (net.Conn, error) { | ||
| return DialProxyWithDialer(ctx, proxyAddr, addr, &net.Dialer{}) | ||
| } | ||
|
|
||
| // DialProxyWithDialer creates a connection to a server via an HTTP Proxy using a specified dialer. | ||
| func DialProxyWithDialer(ctx context.Context, proxyAddr, addr string, dialer ContextDialer) (net.Conn, error) { | ||
| conn, err := dialer.DialContext(ctx, "tcp", proxyAddr) | ||
| if err != nil { | ||
| log.Warnf("Unable to dial to proxy: %v: %v.", proxyAddr, err) | ||
| return nil, trace.ConvertSystemError(err) | ||
| } | ||
|
|
||
| connectReq := &http.Request{ | ||
| Method: http.MethodConnect, | ||
| URL: &url.URL{Opaque: addr}, | ||
| Host: addr, | ||
| Header: make(http.Header), | ||
| } | ||
|
|
||
| if err := connectReq.Write(conn); err != nil { | ||
| log.Warnf("Unable to write to proxy: %v.", err) | ||
| return nil, trace.Wrap(err) | ||
| } | ||
|
|
||
| // Read in the response. http.ReadResponse will read in the status line, mime | ||
| // headers, and potentially part of the response body. the body itself will | ||
| // not be read, but kept around so it can be read later. | ||
| br := bufio.NewReader(conn) | ||
| // Per the above comment, we're only using ReadResponse to check the status | ||
| // and then hand off the underlying connection to the caller. | ||
| // resp.Body.Close() would drain conn and close it, we don't need to do it | ||
| // here. Disabling bodyclose linter for this edge case. | ||
| //nolint:bodyclose | ||
| resp, err := http.ReadResponse(br, connectReq) | ||
| if err != nil { | ||
| conn.Close() | ||
| log.Warnf("Unable to read response: %v.", err) | ||
| return nil, trace.Wrap(err) | ||
| } | ||
| if resp.StatusCode != http.StatusOK { | ||
| conn.Close() | ||
| return nil, trace.BadParameter("unable to proxy connection: %v", resp.Status) | ||
| } | ||
|
|
||
| // Return a bufferedConn that wraps a net.Conn and a *bufio.Reader. this | ||
| // needs to be done because http.ReadResponse will buffer part of the | ||
| // response body in the *bufio.Reader that was passed in. reads must first | ||
| // come from anything buffered, then from the underlying connection otherwise | ||
| // data will be lost. | ||
| return &bufferedConn{ | ||
| Conn: conn, | ||
| reader: br, | ||
| }, nil | ||
| } | ||
|
|
||
| // GetProxyAddress gets the HTTP proxy address to use for a given address, if any. | ||
| func GetProxyAddress(addr string) string { | ||
| envs := []string{ | ||
| constants.HTTPSProxy, | ||
| strings.ToLower(constants.HTTPSProxy), | ||
| constants.HTTPProxy, | ||
| strings.ToLower(constants.HTTPProxy), | ||
| } | ||
|
|
||
| for _, v := range envs { | ||
| envAddr := os.Getenv(v) | ||
| if envAddr == "" { | ||
| continue | ||
| } | ||
| proxyAddr, err := parse(envAddr) | ||
| if err != nil { | ||
| log.Debugf("Unable to parse environment variable %q: %q.", v, envAddr) | ||
| continue | ||
| } | ||
| log.Debugf("Successfully parsed environment variable %q: %q to %q.", v, envAddr, proxyAddr) | ||
| if !useProxy(addr) { | ||
| log.Debugf("Matched NO_PROXY override for %q: %q, going to ignore proxy variable.", v, envAddr) | ||
| return "" | ||
| } | ||
| return proxyAddr | ||
| } | ||
|
|
||
| log.Debugf("No valid environment variables found.") | ||
| return "" | ||
| } | ||
|
|
||
| // bufferedConn is used when part of the data on a connection has already been | ||
| // read by a *bufio.Reader. Reads will first try and read from the | ||
| // *bufio.Reader and when everything has been read, reads will go to the | ||
| // underlying connection. | ||
| type bufferedConn struct { | ||
| net.Conn | ||
| reader *bufio.Reader | ||
| } | ||
|
|
||
| // Read first reads from the *bufio.Reader any data that has already been | ||
| // buffered. Once all buffered data has been read, reads go to the net.Conn. | ||
| func (bc *bufferedConn) Read(b []byte) (n int, err error) { | ||
| if bc.reader.Buffered() > 0 { | ||
| return bc.reader.Read(b) | ||
| } | ||
| return bc.Conn.Read(b) | ||
| } | ||
|
|
||
| // parse will extract the host:port of the proxy to dial to. If the | ||
| // value is not prefixed by "http", then it will prepend "http" and try. | ||
| func parse(addr string) (string, error) { | ||
| proxyurl, err := url.Parse(addr) | ||
| if err != nil || !strings.HasPrefix(proxyurl.Scheme, "http") { | ||
| proxyurl, err = url.Parse("http://" + addr) | ||
| if err != nil { | ||
| return "", trace.Wrap(err) | ||
| } | ||
| } | ||
|
|
||
| return proxyurl.Host, nil | ||
| } |
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