| Pragya Arya | 324337e | 2020-02-20 14:35:08 +0530 | [diff] [blame] | 1 | package client |
| 2 | |
| 3 | import ( |
| 4 | "fmt" |
| 5 | "net" |
| 6 | |
| 7 | "gopkg.in/jcmturner/gokrb5.v7/kadmin" |
| 8 | "gopkg.in/jcmturner/gokrb5.v7/messages" |
| 9 | ) |
| 10 | |
| 11 | // Kpasswd server response codes. |
| 12 | const ( |
| 13 | KRB5_KPASSWD_SUCCESS = 0 |
| 14 | KRB5_KPASSWD_MALFORMED = 1 |
| 15 | KRB5_KPASSWD_HARDERROR = 2 |
| 16 | KRB5_KPASSWD_AUTHERROR = 3 |
| 17 | KRB5_KPASSWD_SOFTERROR = 4 |
| 18 | KRB5_KPASSWD_ACCESSDENIED = 5 |
| 19 | KRB5_KPASSWD_BAD_VERSION = 6 |
| 20 | KRB5_KPASSWD_INITIAL_FLAG_NEEDED = 7 |
| 21 | ) |
| 22 | |
| 23 | // ChangePasswd changes the password of the client to the value provided. |
| 24 | func (cl *Client) ChangePasswd(newPasswd string) (bool, error) { |
| 25 | ASReq, err := messages.NewASReqForChgPasswd(cl.Credentials.Domain(), cl.Config, cl.Credentials.CName()) |
| 26 | if err != nil { |
| 27 | return false, err |
| 28 | } |
| 29 | ASRep, err := cl.ASExchange(cl.Credentials.Domain(), ASReq, 0) |
| 30 | if err != nil { |
| 31 | return false, err |
| 32 | } |
| 33 | |
| 34 | msg, key, err := kadmin.ChangePasswdMsg(cl.Credentials.CName(), cl.Credentials.Domain(), newPasswd, ASRep.Ticket, ASRep.DecryptedEncPart.Key) |
| 35 | if err != nil { |
| 36 | return false, err |
| 37 | } |
| 38 | r, err := cl.sendToKPasswd(msg) |
| 39 | if err != nil { |
| 40 | return false, err |
| 41 | } |
| 42 | err = r.Decrypt(key) |
| 43 | if err != nil { |
| 44 | return false, err |
| 45 | } |
| 46 | if r.ResultCode != KRB5_KPASSWD_SUCCESS { |
| 47 | return false, fmt.Errorf("error response from kadmin: code: %d; result: %s; krberror: %v", r.ResultCode, r.Result, r.KRBError) |
| 48 | } |
| 49 | cl.Credentials.WithPassword(newPasswd) |
| 50 | return true, nil |
| 51 | } |
| 52 | |
| 53 | func (cl *Client) sendToKPasswd(msg kadmin.Request) (r kadmin.Reply, err error) { |
| 54 | _, kps, err := cl.Config.GetKpasswdServers(cl.Credentials.Domain(), true) |
| 55 | if err != nil { |
| 56 | return |
| 57 | } |
| 58 | addr := kps[1] |
| 59 | b, err := msg.Marshal() |
| 60 | if err != nil { |
| 61 | return |
| 62 | } |
| 63 | if len(b) <= cl.Config.LibDefaults.UDPPreferenceLimit { |
| 64 | return cl.sendKPasswdUDP(b, addr) |
| 65 | } |
| 66 | return cl.sendKPasswdTCP(b, addr) |
| 67 | } |
| 68 | |
| 69 | func (cl *Client) sendKPasswdTCP(b []byte, kadmindAddr string) (r kadmin.Reply, err error) { |
| 70 | tcpAddr, err := net.ResolveTCPAddr("tcp", kadmindAddr) |
| 71 | if err != nil { |
| 72 | return |
| 73 | } |
| 74 | conn, err := net.DialTCP("tcp", nil, tcpAddr) |
| 75 | if err != nil { |
| 76 | return |
| 77 | } |
| 78 | rb, err := cl.sendTCP(conn, b) |
| 79 | err = r.Unmarshal(rb) |
| 80 | return |
| 81 | } |
| 82 | |
| 83 | func (cl *Client) sendKPasswdUDP(b []byte, kadmindAddr string) (r kadmin.Reply, err error) { |
| 84 | udpAddr, err := net.ResolveUDPAddr("udp", kadmindAddr) |
| 85 | if err != nil { |
| 86 | return |
| 87 | } |
| 88 | conn, err := net.DialUDP("udp", nil, udpAddr) |
| 89 | if err != nil { |
| 90 | return |
| 91 | } |
| 92 | rb, err := cl.sendUDP(conn, b) |
| 93 | err = r.Unmarshal(rb) |
| 94 | return |
| 95 | } |