/
waf.go
91 lines (76 loc) · 1.96 KB
/
waf.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
package waf
import (
"github.com/caddyserver/caddy/v2"
"github.com/caddyserver/caddy/v2/modules/caddyhttp"
"go.uber.org/zap"
"net/http"
"strings"
)
type CaddyWaf struct {
logger *zap.Logger
ArgsRule []string
UserAgentRule []string
PostRule []string
IpAllowRule []string
IpBlockRule []string
RateLimitBucket int
RateLimitRate float64
rateLimit *RateLimit
}
func init() {
caddy.RegisterModule(CaddyWaf{})
}
// CaddyModule returns the Caddy module information.
func (CaddyWaf) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "http.handlers.waf",
New: func() caddy.Module { return new(CaddyWaf) },
}
}
func (w *CaddyWaf) Provision(ctx caddy.Context) error {
w.logger = ctx.Logger(w) // g.logger is a *zap.Logger
w.rateLimit = NewRateLimit(w.logger, w.RateLimitBucket, w.RateLimitRate)
return nil
}
func (w *CaddyWaf) Validate() error {
w.logger.Info("Validate.")
return nil
}
// ServeHTTP implements caddyhttp.MiddlewareHandler.
func (w CaddyWaf) ServeHTTP(rw http.ResponseWriter, r *http.Request, next caddyhttp.Handler) error {
remoteAddr := w.getRemoteIp(r)
//ip allow rule
if w.detectIp(remoteAddr, false) {
return next.ServeHTTP(rw, r)
}
if w.detectIp(remoteAddr, true) ||
w.detectRequestArgs(r) ||
w.detectRequestBody(r) ||
w.detectUserAgent(r) ||
w.rateLimit.detect(remoteAddr, r) {
return w.redirectIntercept(rw)
}
return next.ServeHTTP(rw, r)
}
func (w CaddyWaf) getRemoteIp(r *http.Request) string {
i := strings.Index(r.RemoteAddr, ":")
if i < 1 {
return r.RemoteAddr
}
return r.RemoteAddr[:i]
}
func (w CaddyWaf) Start() error {
w.logger.Info("App start.")
return nil
}
func (w CaddyWaf) Stop() error {
w.logger.Info("App stop.")
return nil
}
// Interface guards
var (
_ caddy.Provisioner = (*CaddyWaf)(nil)
_ caddy.Validator = (*CaddyWaf)(nil)
_ caddyhttp.MiddlewareHandler = (*CaddyWaf)(nil)
_ caddy.App = (*CaddyWaf)(nil)
)