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
|
// Package basicauth implements HTTP Basic Authentication.
package basicauth
import (
"net/http"
"github.com/mholt/caddy/middleware"
)
// New constructs a new BasicAuth middleware instance.
func New(c middleware.Controller) (middleware.Middleware, error) {
rules, err := parse(c)
if err != nil {
return nil, err
}
basic := BasicAuth{
Rules: rules,
}
return func(next middleware.Handler) middleware.Handler {
basic.Next = next
return basic
}, nil
}
// ServeHTTP implements the middleware.Handler interface.
func (a BasicAuth) ServeHTTP(w http.ResponseWriter, r *http.Request) (int, error) {
for _, rule := range a.Rules {
for _, res := range rule.Resources {
if !middleware.Path(r.URL.Path).Matches(res) {
continue
}
// Path matches; parse auth header
username, password, ok := r.BasicAuth()
// Check credentials
if !ok || username != rule.Username || password != rule.Password {
w.Header().Set("WWW-Authenticate", "Basic")
return http.StatusUnauthorized, nil
}
// "It's an older code, sir, but it checks out. I was about to clear them."
return a.Next.ServeHTTP(w, r)
}
}
// Pass-thru when no paths match
return a.Next.ServeHTTP(w, r)
}
func parse(c middleware.Controller) ([]Rule, error) {
var rules []Rule
for c.Next() {
var rule Rule
args := c.RemainingArgs()
switch len(args) {
case 2:
rule.Username = args[0]
rule.Password = args[1]
for c.NextBlock() {
rule.Resources = append(rule.Resources, c.Val())
if c.NextArg() {
return rules, c.Err("Expecting only one resource per line (extra '" + c.Val() + "')")
}
}
case 3:
rule.Resources = append(rule.Resources, args[0])
rule.Username = args[1]
rule.Password = args[2]
default:
return rules, c.ArgErr()
}
rules = append(rules, rule)
}
return rules, nil
}
// BasicAuth is middleware to protect resources with a username and password.
// Note that HTTP Basic Authentication is not secure by itself and should
// not be used to protect important assets without HTTPS. Even then, the
// security of HTTP Basic Auth is disputed. Use discretion when deciding
// what to protect with BasicAuth.
type BasicAuth struct {
Next middleware.Handler
Rules []Rule
}
// Rule represents a BasicAuth rule. A username and password
// combination protect the associated resources, which are
// file or directory paths.
type Rule struct {
Username string
Password string
Resources []string
}
|
