forked from rancher/rancher
-
Notifications
You must be signed in to change notification settings - Fork 1
/
sign.go
242 lines (219 loc) · 6.69 KB
/
sign.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
package httpproxy
import (
"bytes"
"crypto/md5"
"crypto/rand"
"encoding/base64"
"encoding/hex"
"fmt"
"github.com/rancher/norman/httperror"
"io"
"io/ioutil"
"net/http"
"strings"
"time"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/aws/aws-sdk-go/aws/signer/v4"
"github.com/rancher/types/apis/core/v1"
)
var requiredHeadersForAws = map[string]bool{"host": true,
"x-amz-content-sha256": true,
"x-amz-date": true,
"x-amz-user-agent": true}
type Signer interface {
sign(*http.Request, v1.SecretInterface, string) error
}
func newSigner(auth string) Signer {
splitAuth := strings.Split(auth, " ")
switch strings.ToLower(splitAuth[0]) {
case "awsv4":
return awsv4{}
case "bearer":
return bearer{}
case "basic":
return basic{}
case "digest":
return digest{}
case "arbitrary":
return arbitrary{}
}
return nil
}
func (br bearer) sign(req *http.Request, secrets v1.SecretInterface, auth string) error {
data, secret, err := getAuthData(auth, secrets, []string{"passwordField", "credID"})
if err != nil {
return err
}
req.Header.Set(AuthHeader, fmt.Sprintf("%s %s", "Bearer", secret[data["passwordField"]]))
return nil
}
func (b basic) sign(req *http.Request, secrets v1.SecretInterface, auth string) error {
data, secret, err := getAuthData(auth, secrets, []string{"usernameField", "passwordField", "credID"})
if err != nil {
return err
}
key := fmt.Sprintf("%s:%s", secret[data["usernameField"]], secret[data["passwordField"]])
encoded := base64.URLEncoding.EncodeToString([]byte(key))
req.Header.Set(AuthHeader, fmt.Sprintf("%s %s", "Basic", encoded))
return nil
}
func (a awsv4) sign(req *http.Request, secrets v1.SecretInterface, auth string) error {
_, secret, err := getAuthData(auth, secrets, []string{"credID"})
if err != nil {
return err
}
service, region := a.getServiceAndRegion(req.URL.Host)
creds := credentials.NewStaticCredentials(secret["accessKey"], secret["secretKey"], "")
awsSigner := v4.NewSigner(creds)
var body []byte
if req.Body != nil {
body, err = ioutil.ReadAll(req.Body)
if err != nil {
return fmt.Errorf("error reading request body %v", err)
}
}
oldHeader, newHeader := http.Header{}, http.Header{}
for header, value := range req.Header {
if _, ok := requiredHeadersForAws[strings.ToLower(header)]; ok {
newHeader[header] = value
} else {
oldHeader[header] = value
}
}
req.Header = newHeader
_, err = awsSigner.Sign(req, bytes.NewReader(body), service, region, time.Now())
if err != nil {
return err
}
for key, val := range oldHeader {
req.Header.Add(key, strings.Join(val, ""))
}
return nil
}
func (a awsv4) getServiceAndRegion(host string) (string, string) {
//format : service.region.*
parts := strings.Split(host, ".")
return parts[0], parts[1]
}
func (d digest) sign(req *http.Request, secrets v1.SecretInterface, auth string) error {
data, secret, err := getAuthData(auth, secrets, []string{"usernameField", "passwordField", "credID"})
if err != nil {
return err
}
resp, err := doNewRequest(req) // request to get challenge fields from server
if err != nil {
return err
}
challengeData, err := parseChallenge(resp.Header.Get("WWW-Authenticate"))
if err != nil {
return err
}
challengeData["username"] = secret[data["usernameField"]]
challengeData["password"] = secret[data["passwordField"]]
signature, err := buildSignature(challengeData, req)
if err != nil {
return err
}
req.Header.Set(AuthHeader, fmt.Sprintf("%s %s", "Digest", signature))
return nil
}
func doNewRequest(req *http.Request) (*http.Response, error) {
newReq, err := http.NewRequest(req.Method, req.URL.String(), nil)
if err != nil {
return nil, err
}
newReq.Header.Set("Content-Type", "application/json")
client := http.Client{}
resp, err := client.Do(newReq)
if err != nil {
return nil, err
}
if resp.StatusCode != httperror.Unauthorized.Status {
return nil, fmt.Errorf("expected 401 status code, got %v", resp.StatusCode)
}
resp.Body.Close()
return resp, err
}
func parseChallenge(header string) (map[string]string, error) {
if header == "" {
return nil, fmt.Errorf("failed to get WWW-Authenticate header")
}
s := strings.Trim(header, " \n\r\t")
if !strings.HasPrefix(s, "Digest ") {
return nil, fmt.Errorf("bad challenge %s", header)
}
data := map[string]string{}
s = strings.Trim(s[7:], " \n\r\t")
terms := strings.Split(s, ", ")
for _, term := range terms {
splitTerm := strings.SplitN(term, "=", 2)
data[splitTerm[0]] = strings.Trim(splitTerm[1], "\"")
}
return data, nil
}
func formResponse(qop string, data map[string]string, req *http.Request) (string, string) {
hash1 := hash(fmt.Sprintf("%s:%s:%s", data["username"], data["realm"], data["password"]))
hash2 := hash(fmt.Sprintf("%s:%s", req.Method, req.URL.Path))
if qop == "" {
return hash(fmt.Sprintf("%s:%s:%s", hash1, data["nonce"], hash2)), ""
} else if qop == "auth" {
cnonce := data["cnonce"]
if cnonce == "" {
cnonce = getCnonce()
}
return hash(fmt.Sprintf("%s:%s:%08x:%s:%s:%s",
hash1, data["nonce"], 00000001, cnonce, qop, hash2)), cnonce
}
return "", ""
}
func buildSignature(data map[string]string, req *http.Request) (string, error) {
qop, ok := data["qop"]
if ok && qop != "auth" && qop != "" {
return "", fmt.Errorf("qop not implemented %s", data["qop"])
}
response, cnonce := formResponse(qop, data, req)
if response == "" {
return "", fmt.Errorf("error forming response qop: %s", qop)
}
auth := []string{fmt.Sprintf(`username="%s"`, data["username"])}
auth = append(auth, fmt.Sprintf(`realm="%s"`, data["realm"]))
auth = append(auth, fmt.Sprintf(`nonce="%s"`, data["nonce"]))
auth = append(auth, fmt.Sprintf(`uri="%s"`, req.URL.Path))
auth = append(auth, fmt.Sprintf(`response="%s"`, response))
if val, ok := data["opaque"]; ok && val != "" {
auth = append(auth, fmt.Sprintf(`opaque="%s"`, data["opaque"]))
}
if qop != "" {
auth = append(auth, fmt.Sprintf("qop=%s", qop))
auth = append(auth, fmt.Sprintf("nc=%08x", 00000001))
auth = append(auth, fmt.Sprintf("cnonce=%s", cnonce))
}
return strings.Join(auth, ", "), nil
}
func hash(field string) string {
f := md5.New()
f.Write([]byte(field))
return hex.EncodeToString(f.Sum(nil))
}
func getCnonce() string {
b := make([]byte, 8)
io.ReadFull(rand.Reader, b)
return fmt.Sprintf("%x", b)[:16]
}
func (a arbitrary) sign(req *http.Request, secrets v1.SecretInterface, auth string) error {
data, _, err := getAuthData(auth, secrets, []string{})
if err != nil {
return err
}
splitHeaders := strings.Split(data["headers"], ",")
for _, header := range splitHeaders {
val := strings.SplitN(header, "=", 2)
req.Header.Set(val[0], val[1])
}
return nil
}
type awsv4 struct{}
type bearer struct{}
type basic struct{}
type digest struct{}
type arbitrary struct{}