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rbl.go
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rbl.go
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package core
import (
"context"
"fmt"
"net"
"strings"
"time"
"github.com/croessner/nauthilus/server/config"
"github.com/croessner/nauthilus/server/global"
"github.com/croessner/nauthilus/server/rediscli"
"github.com/croessner/nauthilus/server/util"
"github.com/dspinhirne/netaddr-go"
"github.com/gin-gonic/gin"
)
// isListed triggers a result of true, if an IP address was found on a RBL list. It also returns a human readable name.
func (a *Authentication) isListed(ctx *gin.Context, rbl *config.RBL) (rblListStatus bool, rblName string, err error) {
var (
results []net.IP
reverseIPAddr string
)
guid := ctx.GetString(global.CtxGUIDKey)
ipAddress := net.ParseIP(a.ClientIP)
if ipAddress.IsLoopback() {
return false, "", nil
}
if strings.Contains(ipAddress.String(), ".") {
if !rbl.IPv4 {
return false, "", nil
}
tmp := strings.Split(a.ClientIP, ".")
tmp = []string{tmp[3], tmp[2], tmp[1], tmp[0]}
reverseIPAddr = strings.Join(tmp, ".")
} else {
if !rbl.IPv6 {
return false, "", nil
}
tmp, err := netaddr.ParseIPv6(a.ClientIP) //nolint:govet // Ignore
if err != nil {
return false, "", err
}
// Long version uncompressed
ipv6Str := tmp.Long()
// Remove ':' signs
ipv6Slice := strings.Split(ipv6Str, ":")
ipv6Str = strings.Join(ipv6Slice, "")
// Reverse address
ipv6Slice = strings.Split(ipv6Str, "")
for n := 0; n < (len(ipv6Slice) / 2); n++ { //nolint:gomnd // Ignore
ipv6Slice[n], ipv6Slice[len(ipv6Slice)-n-1] = ipv6Slice[len(ipv6Slice)-n-1], ipv6Slice[n]
}
reverseIPAddr = strings.Join(ipv6Slice, ".")
}
query := fmt.Sprintf("%s.%s", reverseIPAddr, rbl.RBL)
ctxTimeut, cancel := context.WithDeadline(ctx, time.Now().Add(config.LoadableConfig.Server.DNS.Timeout*time.Second))
defer cancel()
resolver := rediscli.NewDNSResolver()
results, err = resolver.LookupIP(ctxTimeut, "ip4", query)
if err != nil {
return false, "", err
}
for _, result := range results {
if result.String() == rbl.ReturnCode {
util.DebugModule(
global.DbgRBL,
global.LogKeyGUID, guid,
"query", query, "result", result.String(), "rbl", rbl.Name,
)
return true, rbl.Name, nil
}
}
return false, "", nil
}