Initial commit

examples/Makefile

@@ -0,0 +1,11 @@
+# Copyright 2009 The Go Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file.
+
+include $(GOROOT)/src/Make.inc
+
+TARG=fakelogin
+GOFILES=\
+    fakelogin.go
+
+include $(GOROOT)/src/Make.cmd

examples/fakelogin.go

@@ -0,0 +1,74 @@
+// This is a fake login implementation!  It uses whatever default
+// PAM service configuration is available on the system, and tries
+// to authenticate any user.  This should cause PAM to ask its
+// conversation handler for a username and password, in sequence.
+//
+// This application will handle those requests by displaying the
+// PAM-provided prompt and sending back the first line of stdin input
+// it can read for each.
+//
+// Keep in mind that unless run as root (or setuid root), the only
+// user's authentication that can succeed is that of the process owner.
+//
+// It's not a real login for several reasons:
+//
+// (!WARNING!) It echos your password to the terminal (!WARNING!)
+// It doesn't switch users.
+// It's not a real login.
+//
+// It does however demonstrate a simple but powerful use of Go PAM.
+
+package main
+
+import(
+    "fmt"
+    "pam"
+    "os"
+    "bufio"
+)
+
+func GetLine(prompt string) (string,bool) {
+    fmt.Print(prompt)
+    in := bufio.NewReader(os.Stdin)
+    input,err := in.ReadString('\n')
+    if err != nil {
+        return "",false
+    }
+    return input[:len(input)-1],true
+}
+
+// Echo on/off is ignored; echo will always happen.
+func DumbPrompter(style int, msg string) (string,bool) {
+    switch style {
+        case pam.PROMPT_ECHO_OFF:
+            return GetLine(msg)
+        case pam.PROMPT_ECHO_ON:
+            return GetLine(msg)
+        case pam.ERROR_MSG:
+            fmt.Fprintf(os.Stderr, "Error: %s\n", msg)
+            return "",true
+        case pam.TEXT_INFO:
+            fmt.Println(msg)
+            return "",true
+    }
+    return "",false
+}
+
+func main() {
+    t,status := pam.Start("", "", pam.ResponseFunc(DumbPrompter))
+    if status != pam.SUCCESS {
+        fmt.Fprintf(os.Stderr, "Start() failed: %s\n", t.Error(status))
+        return
+    }
+    defer func(){ t.End(status) }()
+
+    status = t.Authenticate(0)
+    if status != pam.SUCCESS {
+        fmt.Fprintf(os.Stderr, "Auth failed: %s\n", t.Error(status))
+        return
+    }
+
+    fmt.Printf("Authentication succeeded!\n")
+    fmt.Printf("Goodbye, friend.\n")
+}
+