auth
auth/authcode.go
Switch to a JWT approach. We're going to use a JWT as our access tokens (as discussed in &yet's excellent post https://blog.andyet.com/2015/05/12/micro-services-user-info-and-auth and my ensuing conversation with Fritzy). The benefit of this approach is that we can do authentication and even some authorization without touching the database at all. The drawback is that we can no longer revoke access tokens, only the refresh tokens that grant the access tokens. We need a new config variable to set our private key, used to sign the JWT. We get to remove our token handlers, as we no longer can revoke tokens, so there's no purpose in getting information about it or listing them. Our tokenStore revokeToken gets to be simplified, as it will only ever be used for refresh tokens now. We also updated our postgres and memstore implementations. We added a helper method for generating the signed "access token" (our JWT) and started using it in the places where we're creating a Token. We get to remove the `revoked` SQL column for the tokens table, and rename the `refresh_revoked` column to just be `revoked`. We shortened our access token expiration to 15 minutes instead of an hour, to deal with the token not being revokable.
1 package auth
3 import (
4 "encoding/json"
5 "errors"
6 "net/http"
7 "time"
9 "code.secondbit.org/uuid.hg"
10 )
12 func init() {
13 RegisterGrantType("authorization_code", GrantType{
14 Validate: authCodeGrantValidate,
15 Invalidate: authCodeGrantInvalidate,
16 IssuesRefresh: true,
17 ReturnToken: RenderJSONToken,
18 AllowsPublic: true,
19 AuditString: authCodeGrantAuditString,
20 })
21 }
23 var (
24 // ErrNoAuthorizationCodeStore is returned when a Context tries to act on a authorizationCodeStore without setting one first.
25 ErrNoAuthorizationCodeStore = errors.New("no authorizationCodeStore was specified for the Context")
26 // ErrAuthorizationCodeNotFound is returned when an AuthorizationCode is requested but not found in the authorizationCodeStore.
27 ErrAuthorizationCodeNotFound = errors.New("authorization code not found in authorizationCodeStore")
28 // ErrAuthorizationCodeAlreadyExists is returned when an AuthorizationCode is added to a authorizationCodeStore, but another AuthorizationCode with the
29 // same Code already exists in the authorizationCodeStore.
30 ErrAuthorizationCodeAlreadyExists = errors.New("authorization code already exists in authorizationCodeStore")
31 )
33 // AuthorizationCode represents an authorization grant made by a user to a Client, to
34 // access user data within a defined Scope for a limited amount of time.
35 type AuthorizationCode struct {
36 Code string
37 Created time.Time
38 ExpiresIn int32
39 ClientID uuid.ID
40 Scopes Scopes
41 RedirectURI string
42 State string
43 ProfileID uuid.ID
44 Used bool
45 }
47 type authorizationCodeStore interface {
48 getAuthorizationCode(code string) (AuthorizationCode, error)
49 saveAuthorizationCode(authCode AuthorizationCode) error
50 deleteAuthorizationCode(code string) error
51 deleteAuthorizationCodesByProfileID(profileID uuid.ID) error
52 deleteAuthorizationCodesByClientID(clientID uuid.ID) error
53 useAuthorizationCode(code string) error
54 }
56 func (m *memstore) getAuthorizationCode(code string) (AuthorizationCode, error) {
57 m.authCodeLock.RLock()
58 defer m.authCodeLock.RUnlock()
59 authCode, ok := m.authCodes[code]
60 if !ok {
61 return AuthorizationCode{}, ErrAuthorizationCodeNotFound
62 }
63 return authCode, nil
64 }
66 func (m *memstore) saveAuthorizationCode(authCode AuthorizationCode) error {
67 m.authCodeLock.Lock()
68 defer m.authCodeLock.Unlock()
69 _, ok := m.authCodes[authCode.Code]
70 if ok {
71 return ErrAuthorizationCodeAlreadyExists
72 }
73 m.authCodes[authCode.Code] = authCode
74 return nil
75 }
77 func (m *memstore) deleteAuthorizationCode(code string) error {
78 m.authCodeLock.Lock()
79 defer m.authCodeLock.Unlock()
80 _, ok := m.authCodes[code]
81 if !ok {
82 return ErrAuthorizationCodeNotFound
83 }
84 delete(m.authCodes, code)
85 return nil
86 }
88 func (m *memstore) deleteAuthorizationCodesByProfileID(profileID uuid.ID) error {
89 m.authCodeLock.Lock()
90 defer m.authCodeLock.Unlock()
91 var codes []string
92 for _, code := range m.authCodes {
93 if code.ProfileID.Equal(profileID) {
94 codes = append(codes, code.Code)
95 }
96 }
97 if len(codes) < 1 {
98 return ErrProfileNotFound
99 }
100 for _, code := range codes {
101 delete(m.authCodes, code)
102 }
103 return nil
104 }
106 func (m *memstore) deleteAuthorizationCodesByClientID(clientID uuid.ID) error {
107 m.authCodeLock.Lock()
108 defer m.authCodeLock.Unlock()
109 var codes []string
110 for _, code := range m.authCodes {
111 if code.ClientID.Equal(clientID) {
112 codes = append(codes, code.Code)
113 }
114 }
115 if len(codes) < 1 {
116 return ErrClientNotFound
117 }
118 for _, code := range codes {
119 delete(m.authCodes, code)
120 }
121 return nil
122 }
124 func (m *memstore) useAuthorizationCode(code string) error {
125 m.authCodeLock.Lock()
126 defer m.authCodeLock.Unlock()
127 a, ok := m.authCodes[code]
128 if !ok {
129 return ErrAuthorizationCodeNotFound
130 }
131 a.Used = true
132 m.authCodes[code] = a
133 return nil
134 }
136 func authCodeGrantValidate(w http.ResponseWriter, r *http.Request, context Context) (scopes Scopes, profileID uuid.ID, valid bool) {
137 enc := json.NewEncoder(w)
138 code := r.PostFormValue("code")
139 if code == "" {
140 w.WriteHeader(http.StatusBadRequest)
141 renderJSONError(enc, "invalid_request")
142 return
143 }
144 clientID, _, ok := getClientAuth(w, r, true)
145 if !ok {
146 return
147 }
148 authCode, err := context.GetAuthorizationCode(code)
149 if err != nil {
150 if err == ErrAuthorizationCodeNotFound {
151 w.WriteHeader(http.StatusBadRequest)
152 renderJSONError(enc, "invalid_grant")
153 return
154 }
155 w.WriteHeader(http.StatusInternalServerError)
156 renderJSONError(enc, "server_error")
157 return
158 }
159 redirectURI := r.PostFormValue("redirect_uri")
160 if authCode.RedirectURI != redirectURI {
161 w.WriteHeader(http.StatusBadRequest)
162 renderJSONError(enc, "invalid_grant")
163 return
164 }
165 if !authCode.ClientID.Equal(clientID) {
166 w.WriteHeader(http.StatusBadRequest)
167 renderJSONError(enc, "invalid_grant")
168 return
169 }
170 return authCode.Scopes, authCode.ProfileID, true
171 }
173 func authCodeGrantInvalidate(r *http.Request, context Context) error {
174 code := r.PostFormValue("code")
175 if code == "" {
176 return ErrAuthorizationCodeNotFound
177 }
178 return context.UseAuthorizationCode(code)
179 }
181 func authCodeGrantAuditString(r *http.Request) string {
182 return "authcode:" + r.PostFormValue("code")
183 }