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| 1 | +// Licensed to the Apache Software Foundation (ASF) under one |
| 2 | +// or more contributor license agreements. See the NOTICE file |
| 3 | +// distributed with this work for additional information |
| 4 | +// regarding copyright ownership. The ASF licenses this file |
| 5 | +// to you under the Apache License, Version 2.0 (the |
| 6 | +// "License"); you may not use this file except in compliance |
| 7 | +// with the License. You may obtain a copy of the License at |
| 8 | +// |
| 9 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | +// |
| 11 | +// Unless required by applicable law or agreed to in writing, |
| 12 | +// software distributed under the License is distributed on an |
| 13 | +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| 14 | +// KIND, either express or implied. See the License for the |
| 15 | +// specific language governing permissions and limitations |
| 16 | +// under the License. |
| 17 | + |
| 18 | +package auth |
| 19 | + |
| 20 | +import ( |
| 21 | + "crypto/tls" |
| 22 | + "encoding/base64" |
| 23 | + "errors" |
| 24 | + "io/ioutil" |
| 25 | + "regexp" |
| 26 | + "strings" |
| 27 | + "time" |
| 28 | + |
| 29 | + zms "github.com/yahoo/athenz/libs/go/zmssvctoken" |
| 30 | + zts "github.com/yahoo/athenz/libs/go/ztsroletoken" |
| 31 | +) |
| 32 | + |
| 33 | +const ( |
| 34 | + minExpire = 2 * time.Hour |
| 35 | + maxExpire = 24 * time.Hour |
| 36 | +) |
| 37 | + |
| 38 | +type athenzAuthProvider struct { |
| 39 | + providerDomain string |
| 40 | + tenantDomain string |
| 41 | + tenantService string |
| 42 | + privateKey string |
| 43 | + keyID string |
| 44 | + principalHeader string |
| 45 | + ztsURL string |
| 46 | + tokenBuilder zms.TokenBuilder |
| 47 | + roleToken zts.RoleToken |
| 48 | + zmsNewTokenBuilder func(domain, name string, privateKeyPEM []byte, keyVersion string) (zms.TokenBuilder, error) |
| 49 | + ztsNewRoleToken func(tok zms.Token, domain string, opts zts.RoleTokenOptions) zts.RoleToken |
| 50 | +} |
| 51 | + |
| 52 | +type privateKeyURI struct { |
| 53 | + Scheme string |
| 54 | + MediaTypeAndEncodingType string |
| 55 | + Data string |
| 56 | + Path string |
| 57 | +} |
| 58 | + |
| 59 | +func NewAuthenticationAthenzWithParams(params map[string]string) (Provider, error) { |
| 60 | + return NewAuthenticationAthenz( |
| 61 | + params["providerDomain"], |
| 62 | + params["tenantDomain"], |
| 63 | + params["tenantService"], |
| 64 | + params["privateKey"], |
| 65 | + params["keyId"], |
| 66 | + params["principalHeader"], |
| 67 | + params["ztsUrl"], |
| 68 | + ), nil |
| 69 | +} |
| 70 | + |
| 71 | +func NewAuthenticationAthenz( |
| 72 | + providerDomain string, |
| 73 | + tenantDomain string, |
| 74 | + tenantService string, |
| 75 | + privateKey string, |
| 76 | + keyID string, |
| 77 | + principalHeader string, |
| 78 | + ztsURL string) Provider { |
| 79 | + var fixedKeyID string |
| 80 | + if keyID == "" { |
| 81 | + fixedKeyID = "0" |
| 82 | + } else { |
| 83 | + fixedKeyID = keyID |
| 84 | + } |
| 85 | + ztsNewRoleToken := func(tok zms.Token, domain string, opts zts.RoleTokenOptions) zts.RoleToken { |
| 86 | + return zts.RoleToken(zts.NewRoleToken(tok, domain, opts)) |
| 87 | + } |
| 88 | + |
| 89 | + return &athenzAuthProvider{ |
| 90 | + providerDomain: providerDomain, |
| 91 | + tenantDomain: tenantDomain, |
| 92 | + tenantService: tenantService, |
| 93 | + privateKey: privateKey, |
| 94 | + keyID: fixedKeyID, |
| 95 | + principalHeader: principalHeader, |
| 96 | + ztsURL: strings.TrimSuffix(ztsURL, "/"), |
| 97 | + zmsNewTokenBuilder: zms.NewTokenBuilder, |
| 98 | + ztsNewRoleToken: ztsNewRoleToken, |
| 99 | + } |
| 100 | +} |
| 101 | + |
| 102 | +func (p *athenzAuthProvider) Init() error { |
| 103 | + uriSt := parseURI(p.privateKey) |
| 104 | + var keyData []byte |
| 105 | + |
| 106 | + if uriSt.Scheme == "data" { |
| 107 | + if uriSt.MediaTypeAndEncodingType != "application/x-pem-file;base64" { |
| 108 | + return errors.New("Unsupported mediaType or encodingType: " + uriSt.MediaTypeAndEncodingType) |
| 109 | + } |
| 110 | + key, err := base64.StdEncoding.DecodeString(uriSt.Data) |
| 111 | + if err != nil { |
| 112 | + return err |
| 113 | + } |
| 114 | + keyData = key |
| 115 | + } else if uriSt.Scheme == "file" { |
| 116 | + key, err := ioutil.ReadFile(uriSt.Path) |
| 117 | + if err != nil { |
| 118 | + return err |
| 119 | + } |
| 120 | + keyData = key |
| 121 | + } else { |
| 122 | + return errors.New("Unsupported URI Scheme: " + uriSt.Scheme) |
| 123 | + } |
| 124 | + |
| 125 | + tb, err := p.zmsNewTokenBuilder(p.tenantDomain, p.tenantService, keyData, p.keyID) |
| 126 | + if err != nil { |
| 127 | + return err |
| 128 | + } |
| 129 | + p.tokenBuilder = tb |
| 130 | + |
| 131 | + roleToken := p.ztsNewRoleToken(p.tokenBuilder.Token(), p.providerDomain, zts.RoleTokenOptions{ |
| 132 | + BaseZTSURL: p.ztsURL + "/zts/v1", |
| 133 | + MinExpire: minExpire, |
| 134 | + MaxExpire: maxExpire, |
| 135 | + AuthHeader: p.principalHeader, |
| 136 | + }) |
| 137 | + p.roleToken = roleToken |
| 138 | + |
| 139 | + return nil |
| 140 | +} |
| 141 | + |
| 142 | +func (p *athenzAuthProvider) Name() string { |
| 143 | + return "athenz" |
| 144 | +} |
| 145 | + |
| 146 | +func (p *athenzAuthProvider) GetTLSCertificate() (*tls.Certificate, error) { |
| 147 | + return nil, nil |
| 148 | +} |
| 149 | + |
| 150 | +func (p *athenzAuthProvider) GetData() ([]byte, error) { |
| 151 | + tok, err := p.roleToken.RoleTokenValue() |
| 152 | + if err != nil { |
| 153 | + return nil, err |
| 154 | + } |
| 155 | + |
| 156 | + return []byte(tok), nil |
| 157 | +} |
| 158 | + |
| 159 | +func (p *athenzAuthProvider) Close() error { |
| 160 | + return nil |
| 161 | +} |
| 162 | + |
| 163 | +func parseURI(uri string) privateKeyURI { |
| 164 | + var uriSt privateKeyURI |
| 165 | + // scheme mediatype[;base64] path file |
| 166 | + const expression = `^(?:([^:/?#]+):)(?:([;/\\\-\w]*),)?(?:/{0,2}((?:[^?#/]*/)*))?([^?#]*)` |
| 167 | + |
| 168 | + // when expression cannot be parsed, then panics |
| 169 | + re := regexp.MustCompile(expression) |
| 170 | + if re.MatchString(uri) { |
| 171 | + groups := re.FindStringSubmatch(uri) |
| 172 | + uriSt.Scheme = groups[1] |
| 173 | + uriSt.MediaTypeAndEncodingType = groups[2] |
| 174 | + uriSt.Data = groups[4] |
| 175 | + uriSt.Path = groups[3] + groups[4] |
| 176 | + } |
| 177 | + |
| 178 | + return uriSt |
| 179 | +} |
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