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| 1 | +// Copyright 2019 The Go Authors. All rights reserved. |
| 2 | +// Use of this source code is governed by a BSD-style |
| 3 | +// license that can be found in the LICENSE file. |
| 4 | + |
| 5 | +package ssh |
| 6 | + |
| 7 | +import ( |
| 8 | + "reflect" |
| 9 | + "testing" |
| 10 | +) |
| 11 | + |
| 12 | +func TestFindAgreedAlgorithms(t *testing.T) { |
| 13 | + initKex := func(k *kexInitMsg) { |
| 14 | + if k.KexAlgos == nil { |
| 15 | + k.KexAlgos = []string{"kex1"} |
| 16 | + } |
| 17 | + if k.ServerHostKeyAlgos == nil { |
| 18 | + k.ServerHostKeyAlgos = []string{"hostkey1"} |
| 19 | + } |
| 20 | + if k.CiphersClientServer == nil { |
| 21 | + k.CiphersClientServer = []string{"cipher1"} |
| 22 | + |
| 23 | + } |
| 24 | + if k.CiphersServerClient == nil { |
| 25 | + k.CiphersServerClient = []string{"cipher1"} |
| 26 | + |
| 27 | + } |
| 28 | + if k.MACsClientServer == nil { |
| 29 | + k.MACsClientServer = []string{"mac1"} |
| 30 | + |
| 31 | + } |
| 32 | + if k.MACsServerClient == nil { |
| 33 | + k.MACsServerClient = []string{"mac1"} |
| 34 | + |
| 35 | + } |
| 36 | + if k.CompressionClientServer == nil { |
| 37 | + k.CompressionClientServer = []string{"compression1"} |
| 38 | + |
| 39 | + } |
| 40 | + if k.CompressionServerClient == nil { |
| 41 | + k.CompressionServerClient = []string{"compression1"} |
| 42 | + |
| 43 | + } |
| 44 | + if k.LanguagesClientServer == nil { |
| 45 | + k.LanguagesClientServer = []string{"language1"} |
| 46 | + |
| 47 | + } |
| 48 | + if k.LanguagesServerClient == nil { |
| 49 | + k.LanguagesServerClient = []string{"language1"} |
| 50 | + |
| 51 | + } |
| 52 | + } |
| 53 | + |
| 54 | + initDirAlgs := func(a *directionAlgorithms) { |
| 55 | + if a.Cipher == "" { |
| 56 | + a.Cipher = "cipher1" |
| 57 | + } |
| 58 | + if a.MAC == "" { |
| 59 | + a.MAC = "mac1" |
| 60 | + } |
| 61 | + if a.Compression == "" { |
| 62 | + a.Compression = "compression1" |
| 63 | + } |
| 64 | + } |
| 65 | + |
| 66 | + initAlgs := func(a *algorithms) { |
| 67 | + if a.kex == "" { |
| 68 | + a.kex = "kex1" |
| 69 | + } |
| 70 | + if a.hostKey == "" { |
| 71 | + a.hostKey = "hostkey1" |
| 72 | + } |
| 73 | + initDirAlgs(&a.r) |
| 74 | + initDirAlgs(&a.w) |
| 75 | + } |
| 76 | + |
| 77 | + type testcase struct { |
| 78 | + name string |
| 79 | + clientIn, serverIn kexInitMsg |
| 80 | + wantClient, wantServer algorithms |
| 81 | + wantErr bool |
| 82 | + } |
| 83 | + |
| 84 | + cases := []testcase{ |
| 85 | + testcase{ |
| 86 | + name: "standard", |
| 87 | + }, |
| 88 | + |
| 89 | + testcase{ |
| 90 | + name: "no common hostkey", |
| 91 | + serverIn: kexInitMsg{ |
| 92 | + ServerHostKeyAlgos: []string{"hostkey2"}, |
| 93 | + }, |
| 94 | + wantErr: true, |
| 95 | + }, |
| 96 | + |
| 97 | + testcase{ |
| 98 | + name: "no common kex", |
| 99 | + serverIn: kexInitMsg{ |
| 100 | + KexAlgos: []string{"kex2"}, |
| 101 | + }, |
| 102 | + wantErr: true, |
| 103 | + }, |
| 104 | + |
| 105 | + testcase{ |
| 106 | + name: "no common cipher", |
| 107 | + serverIn: kexInitMsg{ |
| 108 | + CiphersClientServer: []string{"cipher2"}, |
| 109 | + }, |
| 110 | + wantErr: true, |
| 111 | + }, |
| 112 | + |
| 113 | + testcase{ |
| 114 | + name: "client decides cipher", |
| 115 | + serverIn: kexInitMsg{ |
| 116 | + CiphersClientServer: []string{"cipher1", "cipher2"}, |
| 117 | + CiphersServerClient: []string{"cipher2", "cipher3"}, |
| 118 | + }, |
| 119 | + clientIn: kexInitMsg{ |
| 120 | + CiphersClientServer: []string{"cipher2", "cipher1"}, |
| 121 | + CiphersServerClient: []string{"cipher3", "cipher2"}, |
| 122 | + }, |
| 123 | + wantClient: algorithms{ |
| 124 | + r: directionAlgorithms{ |
| 125 | + Cipher: "cipher3", |
| 126 | + }, |
| 127 | + w: directionAlgorithms{ |
| 128 | + Cipher: "cipher2", |
| 129 | + }, |
| 130 | + }, |
| 131 | + wantServer: algorithms{ |
| 132 | + w: directionAlgorithms{ |
| 133 | + Cipher: "cipher3", |
| 134 | + }, |
| 135 | + r: directionAlgorithms{ |
| 136 | + Cipher: "cipher2", |
| 137 | + }, |
| 138 | + }, |
| 139 | + }, |
| 140 | + |
| 141 | + // TODO(hanwen): fix and add tests for AEAD ignoring |
| 142 | + // the MACs field |
| 143 | + } |
| 144 | + |
| 145 | + for i := range cases { |
| 146 | + initKex(&cases[i].clientIn) |
| 147 | + initKex(&cases[i].serverIn) |
| 148 | + initAlgs(&cases[i].wantClient) |
| 149 | + initAlgs(&cases[i].wantServer) |
| 150 | + } |
| 151 | + |
| 152 | + for _, c := range cases { |
| 153 | + t.Run(c.name, func(t *testing.T) { |
| 154 | + serverAlgs, serverErr := findAgreedAlgorithms(false, &c.clientIn, &c.serverIn) |
| 155 | + clientAlgs, clientErr := findAgreedAlgorithms(true, &c.clientIn, &c.serverIn) |
| 156 | + |
| 157 | + serverHasErr := serverErr != nil |
| 158 | + clientHasErr := clientErr != nil |
| 159 | + if c.wantErr != serverHasErr || c.wantErr != clientHasErr { |
| 160 | + t.Fatalf("got client/server error (%v, %v), want hasError %v", |
| 161 | + clientErr, serverErr, c.wantErr) |
| 162 | + |
| 163 | + } |
| 164 | + if c.wantErr { |
| 165 | + return |
| 166 | + } |
| 167 | + |
| 168 | + if !reflect.DeepEqual(serverAlgs, &c.wantServer) { |
| 169 | + t.Errorf("server: got algs %#v, want %#v", serverAlgs, &c.wantServer) |
| 170 | + } |
| 171 | + if !reflect.DeepEqual(clientAlgs, &c.wantClient) { |
| 172 | + t.Errorf("server: got algs %#v, want %#v", clientAlgs, &c.wantClient) |
| 173 | + } |
| 174 | + }) |
| 175 | + } |
| 176 | +} |
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