mirror of
https://github.com/vbatts/imgsrv.git
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135 lines
3.4 KiB
Go
135 lines
3.4 KiB
Go
// Package sasl is an implementation detail of the mgo package.
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//
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// This package is not meant to be used by itself.
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//
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package sasl
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// #cgo LDFLAGS: -lsasl2
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//
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// struct sasl_conn {};
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//
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// #include <stdlib.h>
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// #include <sasl/sasl.h>
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//
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// sasl_callback_t *mgo_sasl_callbacks(const char *username, const char *password);
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//
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import "C"
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import (
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"fmt"
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"strings"
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"sync"
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"unsafe"
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)
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type saslStepper interface {
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Step(serverData []byte) (clientData []byte, done bool, err error)
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Close()
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}
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type saslSession struct {
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conn *C.sasl_conn_t
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step int
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mech string
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cstrings []*C.char
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callbacks *C.sasl_callback_t
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}
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var initError error
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var initOnce sync.Once
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func initSASL() {
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rc := C.sasl_client_init(nil)
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if rc != C.SASL_OK {
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initError = saslError(rc, nil, "cannot initialize SASL library")
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}
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}
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func New(username, password, mechanism, service, host string) (saslStepper, error) {
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initOnce.Do(initSASL)
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if initError != nil {
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return nil, initError
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}
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ss := &saslSession{mech: mechanism}
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if service == "" {
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service = "mongodb"
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}
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if i := strings.Index(host, ":"); i >= 0 {
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host = host[:i]
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}
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ss.callbacks = C.mgo_sasl_callbacks(ss.cstr(username), ss.cstr(password))
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rc := C.sasl_client_new(ss.cstr(service), ss.cstr(host), nil, nil, ss.callbacks, 0, &ss.conn)
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if rc != C.SASL_OK {
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ss.Close()
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return nil, saslError(rc, nil, "cannot create new SASL client")
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}
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return ss, nil
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}
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func (ss *saslSession) cstr(s string) *C.char {
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cstr := C.CString(s)
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ss.cstrings = append(ss.cstrings, cstr)
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return cstr
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}
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func (ss *saslSession) Close() {
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for _, cstr := range ss.cstrings {
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C.free(unsafe.Pointer(cstr))
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}
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ss.cstrings = nil
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if ss.callbacks != nil {
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C.free(unsafe.Pointer(ss.callbacks))
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}
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// The documentation of SASL dispose makes it clear that this should only
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// be done when the connection is done, not when the authentication phase
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// is done, because an encryption layer may have been negotiated.
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// Even then, we'll do this for now, because it's simpler and prevents
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// keeping track of this state for every socket. If it breaks, we'll fix it.
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C.sasl_dispose(&ss.conn)
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}
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func (ss *saslSession) Step(serverData []byte) (clientData []byte, done bool, err error) {
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ss.step++
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if ss.step > 10 {
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return nil, false, fmt.Errorf("too many SASL steps without authentication")
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}
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var cclientData *C.char
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var cclientDataLen C.uint
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var rc C.int
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if ss.step == 1 {
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var mechanism *C.char // ignored - must match cred
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rc = C.sasl_client_start(ss.conn, ss.cstr(ss.mech), nil, &cclientData, &cclientDataLen, &mechanism)
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} else {
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var cserverData *C.char
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var cserverDataLen C.uint
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if len(serverData) > 0 {
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cserverData = (*C.char)(unsafe.Pointer(&serverData[0]))
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cserverDataLen = C.uint(len(serverData))
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}
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rc = C.sasl_client_step(ss.conn, cserverData, cserverDataLen, nil, &cclientData, &cclientDataLen)
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}
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if cclientData != nil && cclientDataLen > 0 {
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clientData = C.GoBytes(unsafe.Pointer(cclientData), C.int(cclientDataLen))
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}
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if rc == C.SASL_OK {
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return clientData, true, nil
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}
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if rc == C.SASL_CONTINUE {
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return clientData, false, nil
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}
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return nil, false, saslError(rc, ss.conn, "cannot establish SASL session")
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}
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func saslError(rc C.int, conn *C.sasl_conn_t, msg string) error {
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var detail string
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if conn == nil {
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detail = C.GoString(C.sasl_errstring(rc, nil, nil))
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} else {
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detail = C.GoString(C.sasl_errdetail(conn))
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}
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return fmt.Errorf(msg + ": " + detail)
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}
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