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path: root/src/nshd/hackers_git/db_pam.go
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// Copyright 2015 Luke Shumaker <lukeshu@sbcglobal.net>.
//
// This is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// This software 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public
// License along with this manual; if not, see
// <http://www.gnu.org/licenses/>.

package hackers_git

import (
	"crypto/rand"
	p "lukeshu.com/git/go/libnslcd.git/proto"
	"math/big"
	s "syscall"
)

func (o *Hackers) PAM_Authentication(cred s.Ucred, req p.Request_PAM_Authentication) <-chan p.PAM_Authentication {
	o.lock.RLock()
	ret := make(chan p.PAM_Authentication)
	go func() {
		defer o.lock.RUnlock()
		defer close(ret)

		uid := o.name2uid(req.UserName)
		if uid < 0 {
			return
		}

		user := o.users[uid]
		obj := p.PAM_Authentication{
			AuthenticationResult: p.NSLCD_PAM_AUTH_ERR,
			UserName:             "",
			AuthorizationResult:  p.NSLCD_PAM_AUTH_ERR,
			AuthorizationError:   "",
		}
		if check_password(req.Password, user.passwd.PwHash) {
			obj.AuthenticationResult = p.NSLCD_PAM_SUCCESS
			obj.AuthorizationResult = obj.AuthenticationResult
			obj.UserName = user.passwd.Name
		}
		ret <- obj
	}()
	return ret
}

func (o *Hackers) PAM_Authorization(cred s.Ucred, req p.Request_PAM_Authorization) <-chan p.PAM_Authorization {
	o.lock.RLock()
	ret := make(chan p.PAM_Authorization)
	go func() {
		defer o.lock.RUnlock()
		defer close(ret)

		uid := o.name2uid(req.UserName)
		if uid < 0 {
			return
		}
		ret <- p.PAM_Authorization{
			Result: p.NSLCD_PAM_SUCCESS,
			Error:  "",
		}
	}()
	return ret
}

const alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"

var alphabet_len = big.NewInt(int64(len(alphabet)))

func (o *Hackers) PAM_SessionOpen(cred s.Ucred, req p.Request_PAM_SessionOpen) <-chan p.PAM_SessionOpen {
	ret := make(chan p.PAM_SessionOpen)
	go func() {
		defer close(ret)

		var sessionid [24]byte
		for i := 0; i < len(sessionid); i++ {
			bigint, err := rand.Int(rand.Reader, alphabet_len)
			if err != nil {
				return
			}
			sessionid[i] = alphabet[bigint.Int64()]
		}
		ret <- p.PAM_SessionOpen{SessionID: string(sessionid[:])}
	}()
	return ret
}

func (o *Hackers) PAM_SessionClose(cred s.Ucred, req p.Request_PAM_SessionClose) <-chan p.PAM_SessionClose {
	ret := make(chan p.PAM_SessionClose)
	go close(ret)
	return ret
}