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|
#!/usr/bin/env bash
# -*- Mode: Go -*-
# Copyright (C) 2015-2017 Luke Shumaker <lukeshu@sbcglobal.net>
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
requests=$1
printf '//'
printf ' %q' "$0" "$@"
printf '\n// MACHINE GENERATED BY THE COMMAND ABOVE; DO NOT EDIT\n\n'
cat <<EOF | gofmt
package nslcd_server
import (
"context"
"fmt"
"io"
"time"
p "git.lukeshu.com/go/libnslcd/nslcd_proto"
)
const sensitive = "<omitted-from-log>"
func maybePanic(err error) {
if err != nil {
panic(err)
}
}
type Limits struct {
// What is the maximum total amount of time that we spend
// handling a single request. This includes both the time
// reading the request and the time creating and writing the
// response.
Timeout time.Duration
// How long can we spend reading a request?
ReadTimeout time.Duration
// How long can we spend writing a response?
WriteTimeout time.Duration
// What is the maximum request length in bytes that we are
// willing to handle?
RequestMaxSize int64
}
type Conn interface {
// This is a subset of net.Conn; semantics are the same.
Read(b []byte) (n int, err error)
Write(b []byte) (n int, err error)
SetDeadline(t time.Time) error
SetReadDeadline(t time.Time) error
SetWriteDeadline(t time.Time) error
}
// Handle a request to nslcd. The caller is responsible for
// initializing the context with PeerCredKey.
func HandleRequest(backend Backend, limits Limits, conn Conn, ctx context.Context) (err error) {
defer func() {
if r := recover(); r != nil {
switch r := r.(type) {
case p.NslcdError:
err = r
default:
panic(r)
}
}
}()
now := time.Now()
deadlineAll := time.Time{}
deadlineRead := time.Time{}
if limits.Timeout != 0 {
deadlineAll = now.Add(limits.Timeout)
}
if deadline, ok := ctx.Deadline(); ok {
if deadlineAll.IsZero() || deadline.Before(deadlineAll) {
deadlineAll = deadline
}
}
if limits.ReadTimeout != 0 {
deadlineRead = now.Add(limits.ReadTimeout)
if !deadlineAll.IsZero() && deadlineAll.Before(deadlineRead) {
deadlineRead = deadlineAll
}
}
deadlineWrite := deadlineAll
if !deadlineRead.IsZero() {
err = conn.SetReadDeadline(deadlineRead)
if err != nil {
return err
}
}
log := LoggerFromContext(ctx)
var in io.Reader = conn
if limits.RequestMaxSize > 0 {
in = &io.LimitedReader{R: in, N: limits.RequestMaxSize}
}
out := conn
var version int32
maybePanic(p.Read(in, &version))
if version != p.NSLCD_VERSION {
return p.NslcdError(fmt.Sprintf("Version mismatch: server=%#08x client=%#08x", p.NSLCD_VERSION, version))
}
var action int32
maybePanic(p.Read(in, &action))
switch action {
$(
while read -r request; do
cat <<EOT
case p.NSLCD_ACTION_${request^^}:
var req p.Request_${request}
maybePanic(p.Read(in, &req))
$(
case "$request" in
PAM_Authentication)
echo '_req := req'
echo '_req.Password = sensitive'
echo 'log.Info(fmt.Sprintf("Request: %#v\n", _req))'
;;
PAM_PwMod)
echo '_req := req'
echo 'if len(_req.OldPassword) > 0 {'
echo ' _req.OldPassword = sensitive'
echo '}'
echo '_req.NewPassword = sensitive'
echo 'log.Info(fmt.Sprintf("Request: %#v", _req))'
;;
PAM_UserMod)
echo '_req := req'
echo '_req.Password = sensitive'
echo 'log.Info(fmt.Sprintf("Request: %#v", _req))'
;;
*)
echo 'log.Info(fmt.Sprintf("Request: %#v", req))'
;;
esac
)
if limits.WriteTimeout != 0 {
deadlineWrite = time.Now().Add(limits.WriteTimeout)
if !deadlineAll.IsZero() && deadlineAll.Before(deadlineWrite) {
deadlineWrite = deadlineAll
}
}
if !deadlineWrite.IsZero() {
err = out.SetWriteDeadline(deadlineWrite)
if err != nil {
return err
}
}
var cancel context.CancelFunc
if deadline, ok := ctx.Deadline(); !ok || (!deadlineWrite.IsZero() && deadline.After(deadlineWrite)) {
ctx, cancel = context.WithDeadline(ctx, deadlineWrite)
} else {
ctx, cancel = context.WithCancel(ctx)
}
defer cancel()
maybePanic(p.Write(out, p.NSLCD_VERSION))
maybePanic(p.Write(out, action))
ch := backend.${request}(ctx, req)
for result := range ch {
if err == nil {
err = p.Write(out, p.NSLCD_RESULT_BEGIN)
}
if err == nil {
err = p.Write(out, result)
}
}
maybePanic(err)
maybePanic(p.Write(out, p.NSLCD_RESULT_END))
return ctx.Err() // probably nil
EOT
done < "$requests"
)
default:
return p.NslcdError(fmt.Sprintf("Unknown request action: %#08x", action))
}
}
EOF
|
