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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"os"
"os/exec"
"github.com/holgermetschulat/radius"
"github.com/holgermetschulat/radius/rfc2865"
)
var secret = flag.String("secret", "", "shared RADIUS secret between clients and server")
var command string
var arguments []string
func handler(w radius.ResponseWriter, r *radius.Request) {
username, err1 := rfc2865.UserName_LookupString(r.Packet)
password, err2 := rfc2865.UserPassword_LookupString(r.Packet)
if err1 != nil || err2 != nil {
w.Write(r.Response(radius.CodeAccessReject))
return
}
log.Printf("%s requesting access (%s #%d)\n", username, r.RemoteAddr, r.Identifier)
cmd := exec.Command(command, arguments...)
cmd.Env = os.Environ()
cmd.Env = append(cmd.Env, "RADIUS_USERNAME="+username, "RADIUS_PASSWORD="+password)
output, err := cmd.Output()
if err != nil {
log.Printf("handler error: %s\n", err)
}
var code radius.Code
if cmd.ProcessState != nil && cmd.ProcessState.Success() {
code = radius.CodeAccessAccept
log.Printf("%s accepted (%s #%d)\n", username, r.RemoteAddr, r.Identifier)
} else {
code = radius.CodeAccessReject
log.Printf("%s rejected (%s #%d)\n", username, r.RemoteAddr, r.Identifier)
}
resp := r.Response(code)
if len(output) > 0 {
rfc2865.ReplyMessage_Set(r.Packet, output)
}
w.Write(resp)
}
const usage = `
program is executed when an Access-Request RADIUS packet is received. If
program exits sucessfully, an Access-Accept response is sent, otherwise, an
Access-Reject is sent. If standard out is non-empty, it is included as an
Reply-Message attribute in the response.
The environment variables RADIUS_USERNAME and RADIUS_PASSWORD are set which hold
the username and password, respectively.
`
func main() {
flag.Usage = func() {
fmt.Fprintf(os.Stderr, "usage: %s [flags] <program> [program arguments...]\n", os.Args[0])
flag.PrintDefaults()
fmt.Fprint(os.Stderr, usage)
}
flag.Parse()
if *secret == "" || flag.NArg() < 1 {
flag.Usage()
os.Exit(1)
}
command = flag.Arg(0)
arguments = flag.Args()[1:]
log.Println("radserver starting")
server := radius.PacketServer{
Handler: radius.HandlerFunc(handler),
SecretSource: radius.StaticSecretSource([]byte(*secret)),
}
if err := server.ListenAndServe(); err != nil {
log.Fatal(err)
}
}