initial support for LDAP authentication/MSAD

3 files changed, 166 insertions, 7 deletions

diff --git a/modules/auth/ldap/README.md b/modules/auth/ldap/README.md
new file mode 100644
index 0000000000..8b508e0fe0
--- /dev/null
+++ b/modules/auth/ldap/README.md
@@ -0,0 +1,43 @@
+LDAP authentication
+===================
+
+## Goal
+
+Authenticat user against LDAP directories
+
+It will bind with the user's login/pasword and query attributs ("mail" for instance) in a pool of directory servers
+
+The first OK wins.
+
+If there's connection error, the server will be disabled and won't be checked again
+
+## Usage
+
+In the [security] section, set 
+>  LDAP_AUTH = true
+
+then for each LDAP source, set
+
+> [LdapSource-someuniquename]
+> name=canonicalName
+> host=hostname-or-ip
+> port=3268	# or regular LDAP port
+> # the following settings depend highly how you've configured your AD
+> basedn=dc=ACME,dc=COM
+> MSADSAFORMAT=%s@ACME.COM
+> filter=(&(objectClass=user)(sAMAccountName=%s))
+
+### Limitation
+
+Only tested on an MS 2008R2 DC, using global catalog (TCP/3268)
+
+This MSAD is a mess.
+
+The way how one checks the directory (CN, DN etc...) may be highly depending local custom configuration
+
+### Todo
+* Define a timeout per server
+* Check servers marked as "Disabled" when they'll come back online
+* Find a more flexible way to define filter/MSADSAFORMAT/Attributes etc... maybe text/template ?
+* Check OpenLDAP server
+* SSL support ?
\ No newline at end of file
diff --git a/modules/auth/ldap/ldap.go b/modules/auth/ldap/ldap.go
new file mode 100644
index 0000000000..29773cda5c
--- /dev/null
+++ b/modules/auth/ldap/ldap.go
@@ -0,0 +1,86 @@
+// Copyright github.com/juju2013. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+// package ldap provide functions & structure to query a LDAP ldap directory
+// For now, it's mainly tested again an MS Active Directory service, see README.md for more information
+package ldap
+
+import (
+	"fmt"
+	"github.com/gogits/gogs/modules/log"
+	goldap "github.com/juju2013/goldap"
+)
+
+// Basic LDAP authentication service
+type ldapsource struct {
+	Name         string // canonical name (ie. corporate.ad)
+	Host         string // LDAP host
+	Port         int    // port number
+	BaseDN       string // Base DN
+	Attributes   string // Attribut to search
+	Filter       string // Query filter to validate entry
+	MsAdSAFormat string // in the case of MS AD Simple Authen, the format to use (see: http://msdn.microsoft.com/en-us/library/cc223499.aspx)
+	Enabled      bool   // if this source is disabled
+}
+
+//Global LDAP directory pool
+var (
+	Authensource []ldapsource
+)
+
+// Add a new source (LDAP directory) to the global pool
+func AddSource(name string, host string, port int, basedn string, attributes string, filter string, msadsaformat string) {
+	ldaphost := ldapsource{name, host, port, basedn, attributes, filter, msadsaformat, true}
+	Authensource = append(Authensource, ldaphost)
+}
+
+//LoginUser : try to login an user to LDAP sources, return requested (attribut,true) if ok, ("",false) other wise
+//First match wins
+//Returns first attribute if exists
+func LoginUser(name, passwd string) (a string, r bool) {
+	r = false
+	for _, ls := range Authensource {
+		a, r = ls.searchEntry(name, passwd)
+		if r {
+			return
+		}
+	}
+	return
+}
+
+// searchEntry : search an LDAP source if an entry (name, passwd) is valide and in the specific filter
+func (ls ldapsource) searchEntry(name, passwd string) (string, bool) {
+	l, err := goldap.Dial("tcp", fmt.Sprintf("%s:%d", ls.Host, ls.Port))
+	if err != nil {
+		log.Debug("LDAP Connect error, disabled source %s", ls.Host)
+		ls.Enabled = false
+		return "", false
+	}
+	defer l.Close()
+
+	nx := fmt.Sprintf(ls.MsAdSAFormat, name)
+	err = l.Bind(nx, passwd)
+	if err != nil {
+		log.Debug("LDAP Authan failed for %s, reason: %s", nx, err.Error())
+		return "", false
+	}
+
+	search := goldap.NewSearchRequest(
+		ls.BaseDN,
+		goldap.ScopeWholeSubtree, goldap.NeverDerefAliases, 0, 0, false,
+		fmt.Sprintf(ls.Filter, name),
+		[]string{ls.Attributes},
+		nil)
+	sr, err := l.Search(search)
+	if err != nil {
+		log.Debug("LDAP Authen OK but not in filter %s", name)
+		return "", false
+	}
+	log.Debug("LDAP Authen OK: %s", name)
+	if len(sr.Entries) > 0 {
+		r := sr.Entries[0].GetAttributeValue(ls.Attributes)
+		return r, true
+	}
+	return "", true
+}
diff --git a/modules/base/conf.go b/modules/base/conf.go
index abb67f6d8f..5724504503 100644
--- a/modules/base/conf.go
+++ b/modules/base/conf.go
@@ -10,6 +10,7 @@ import (
 	"os/exec"
 	"path"
 	"path/filepath"
+	"regexp"
 	"strings"
 
 	"github.com/Unknwon/com"
@@ -19,6 +20,7 @@ import (
 	"github.com/gogits/cache"
 	"github.com/gogits/session"
 
+	"github.com/gogits/gogs/modules/auth/ldap"
 	"github.com/gogits/gogs/modules/log"
 )
 
@@ -51,6 +53,7 @@ var (
 	Domain     string
 	SecretKey  string
 	RunUser    string
+	LdapAuth   bool
 
 	RepoRootPath string
 	ScriptType   string
@@ -83,13 +86,13 @@ var (
 )
 
 var Service struct {
-	RegisterEmailConfirm   bool
-	DisableRegistration    bool
-	RequireSignInView      bool
-	EnableCacheAvatar      bool
-	NotifyMail             bool
-	ActiveCodeLives        int
-	ResetPwdCodeLives      int
+	RegisterEmailConfirm bool
+	DisableRegistration  bool
+	RequireSignInView    bool
+	EnableCacheAvatar    bool
+	NotifyMail           bool
+	ActiveCodeLives      int
+	ResetPwdCodeLives    int
 }
 
 func ExecDir() (string, error) {
@@ -310,6 +313,33 @@ func NewConfigContext() {
 	CookieUserName = Cfg.MustValue("security", "COOKIE_USERNAME")
 	CookieRememberName = Cfg.MustValue("security", "COOKIE_REMEMBER_NAME")
 
+	// load LDAP authentication configuration if present
+	LdapAuth = Cfg.MustBool("security", "LDAP_AUTH", false)
+	if LdapAuth {
+		log.Debug("LDAP AUTHENTICATION activated")
+		nbsrc := 0
+		for _, v := range Cfg.GetSectionList() {
+			if matched, _ := regexp.MatchString("(?i)^LDAPSOURCE.*", v); matched {
+				ldapname := Cfg.MustValue(v, "name", v)
+				ldaphost := Cfg.MustValue(v, "host")
+				ldapport := Cfg.MustInt(v, "port", 389)
+				ldapbasedn := Cfg.MustValue(v, "basedn", "dc=*,dc=*")
+				ldapattribute := Cfg.MustValue(v, "attribute", "mail")
+				ldapfilter := Cfg.MustValue(v, "filter", "(*)")
+				ldapmsadsaformat := Cfg.MustValue(v, "MSADSAFORMAT", "%s")
+				ldap.AddSource(ldapname, ldaphost, ldapport, ldapbasedn, ldapattribute, ldapfilter, ldapmsadsaformat)
+				nbsrc += 1
+				log.Debug("%s added as LDAP source", ldapname)
+			}
+		}
+		if nbsrc == 0 {
+			log.Debug("No valide LDAP found, LDAP AUTHENTICATION NOT activated")
+			LdapAuth = false
+		}
+	} else {
+		log.Debug("LDAP AUTHENTICATION NOT activated")
+	}
+
 	PictureService = Cfg.MustValue("picture", "SERVICE")
 
 	// Determine and create root git reposiroty path.