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1 /*
2 NNCP -- Node to Node copy, utilities for store-and-forward data exchange
3 Copyright (C) 2016-2019 Sergey Matveev <stargrave@stargrave.org>
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation, version 3 of the License.
8
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 GNU General Public License for more details.
13
14 You should have received a copy of the GNU General Public License
15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 package nncp
19
20 import (
21         "crypto/rand"
22         "errors"
23         "sync"
24
25         "github.com/flynn/noise"
26         "golang.org/x/crypto/blake2b"
27         "golang.org/x/crypto/ed25519"
28         "golang.org/x/crypto/nacl/box"
29 )
30
31 type NodeId [blake2b.Size256]byte
32
33 func (id NodeId) String() string {
34         return ToBase32(id[:])
35 }
36
37 type Node struct {
38         Name           string
39         Id             *NodeId
40         ExchPub        *[32]byte
41         SignPub        ed25519.PublicKey
42         NoisePub       *[32]byte
43         Exec           map[string][]string
44         Incoming       *string
45         FreqPath       *string
46         FreqChunked    int64
47         FreqMinSize    int64
48         FreqMaxSize    int64
49         Via            []*NodeId
50         Addrs          map[string]string
51         RxRate         int
52         TxRate         int
53         OnlineDeadline uint
54         MaxOnlineTime  uint
55         Calls          []*Call
56
57         Busy bool
58         sync.Mutex
59 }
60
61 type NodeOur struct {
62         Id       *NodeId
63         ExchPub  *[32]byte
64         ExchPrv  *[32]byte
65         SignPub  ed25519.PublicKey
66         SignPrv  ed25519.PrivateKey
67         NoisePub *[32]byte
68         NoisePrv *[32]byte
69 }
70
71 func NewNodeGenerate() (*NodeOur, error) {
72         exchPub, exchPrv, err := box.GenerateKey(rand.Reader)
73         if err != nil {
74                 return nil, err
75         }
76         signPub, signPrv, err := ed25519.GenerateKey(rand.Reader)
77         if err != nil {
78                 return nil, err
79         }
80         noiseKey, err := noise.DH25519.GenerateKeypair(rand.Reader)
81         if err != nil {
82                 return nil, err
83         }
84         noisePub := new([32]byte)
85         noisePrv := new([32]byte)
86         copy(noisePrv[:], noiseKey.Private)
87         copy(noisePub[:], noiseKey.Public)
88
89         id := NodeId(blake2b.Sum256([]byte(signPub)))
90         node := NodeOur{
91                 Id:       &id,
92                 ExchPub:  exchPub,
93                 ExchPrv:  exchPrv,
94                 SignPub:  signPub,
95                 SignPrv:  signPrv,
96                 NoisePub: noisePub,
97                 NoisePrv: noisePrv,
98         }
99         return &node, nil
100 }
101
102 func (nodeOur *NodeOur) Their() *Node {
103         return &Node{
104                 Name:        "self",
105                 Id:          nodeOur.Id,
106                 ExchPub:     nodeOur.ExchPub,
107                 SignPub:     nodeOur.SignPub,
108                 FreqChunked: MaxFileSize,
109                 FreqMaxSize: MaxFileSize,
110         }
111 }
112
113 func NodeIdFromString(raw string) (*NodeId, error) {
114         decoded, err := FromBase32(raw)
115         if err != nil {
116                 return nil, err
117         }
118         if len(decoded) != blake2b.Size256 {
119                 return nil, errors.New("Invalid node id size")
120         }
121         buf := new([blake2b.Size256]byte)
122         copy(buf[:], decoded)
123         nodeId := NodeId(*buf)
124         return &nodeId, nil
125 }