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ctlsock: handle non-canonical empty paths

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We have to check if the input path is empty AFTER canonicalizing it,
too!
This commit is contained in:
Jakob Unterwurzacher 2017-02-05 18:07:14 +01:00
parent 8bcae63a5a
commit 0f40afc832
1 changed files with 48 additions and 26 deletions
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72
internal/ctlsock/ctlsock_serve.go
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@ -78,6 +78,7 @@ func (ch *ctlSockHandler) acceptLoop() {
// We abort the connection if the request is bigger than this.
const ReadBufSize = 5000
// handleConnection reads and parses JSON requests from "conn"
func (ch *ctlSockHandler) handleConnection(conn *net.UnixConn) {
buf := make([]byte, ReadBufSize)
for {
@ -100,11 +101,8 @@ func (ch *ctlSockHandler) handleConnection(conn *net.UnixConn) {
err = json.Unmarshal(buf, &in)
if err != nil {
tlog.Warn.Printf("ctlsock: JSON Unmarshal error: %#v", err)
errorMsg := ResponseStruct{
ErrNo: int32(syscall.EINVAL),
ErrText: "JSON Unmarshal error: " + err.Error(),
}
sendResponse(&errorMsg, conn)
err = errors.New("JSON Unmarshal error: " + err.Error())
sendResponse(conn, err, "", "")
continue
}
ch.handleRequest(&in, conn)
@ -113,40 +111,64 @@ func (ch *ctlSockHandler) handleConnection(conn *net.UnixConn) {
}
}
// handleRequest handles an already-unmarshaled JSON request
func (ch *ctlSockHandler) handleRequest(in *RequestStruct, conn *net.UnixConn) {
var err error
var out ResponseStruct
var inPath, clean string
var inPath, outPath, clean, warnText string
// You cannot perform both decryption and encryption in one request
if in.DecryptPath != "" && in.EncryptPath != "" {
err = errors.New("Ambigous")
} else if in.DecryptPath == "" && in.EncryptPath == "" {
err = errors.New("No operation")
} else if in.DecryptPath != "" {
inPath = in.DecryptPath
clean = SanitizePath(inPath)
out.Result, err = ch.fs.DecryptPath(clean)
} else if in.EncryptPath != "" {
sendResponse(conn, err, "", "")
return
}
// Neither encryption nor encryption has been requested, makes no sense
if in.DecryptPath == "" && in.EncryptPath == "" {
err = errors.New("Empty input")
sendResponse(conn, err, "", "")
return
}
// Canonicalize input path
if in.EncryptPath != "" {
inPath = in.EncryptPath
} else {
inPath = in.DecryptPath
}
clean = SanitizePath(inPath)
out.Result, err = ch.fs.EncryptPath(clean)
// Warn if a non-canonical path was passed
if inPath != clean {
warnText = fmt.Sprintf("Non-canonical input path '%s' has been interpreted as '%s'.", inPath, clean)
}
// Error out if the canonical path is now empty
if clean == "" {
err = errors.New("Empty input after canonicalization")
sendResponse(conn, err, "", warnText)
return
}
// Actual encrypt or decrypt operation
if in.EncryptPath != "" {
outPath, err = ch.fs.EncryptPath(clean)
} else {
outPath, err = ch.fs.DecryptPath(clean)
}
sendResponse(conn, err, outPath, warnText)
}
// sendResponse sends a JSON response message
func sendResponse(conn *net.UnixConn, err error, result string, warnText string) {
msg := ResponseStruct{
Result: result,
WarnText: warnText,
}
if err != nil {
out.ErrText = err.Error()
out.ErrNo = -1
msg.ErrText = err.Error()
msg.ErrNo = -1
// Try to extract the actual error number
if pe, ok := err.(*os.PathError); ok {
if se, ok := pe.Err.(syscall.Errno); ok {
out.ErrNo = int32(se)
msg.ErrNo = int32(se)
}
}
}
if inPath != clean {
out.WarnText = fmt.Sprintf("Non-canonical input path '%s' has been interpreted as '%s'.", inPath, clean)
}
sendResponse(&out, conn)
}
func sendResponse(msg *ResponseStruct, conn *net.UnixConn) {
jsonMsg, err := json.Marshal(msg)
if err != nil {
tlog.Warn.Printf("ctlsock: Marshal failed: %v", err)