Add PAM authentication

10 files changed, 144 insertions, 2 deletions

diff --git a/.travis.yml b/.travis.yml
index 4149e17316..113773d697 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -6,11 +6,13 @@ go:
   - 1.4
   - tip
 
-sudo: false
+before_install:
+  - sudo apt-get update -qq
+  - sudo apt-get install -y libpam-dev
 
 script: go build -v
 
 notifications:
   email:
     - u@gogs.io
-  slack: gophercn:o5pSanyTeNhnfYc3QnG0X7Wx
\ No newline at end of file
+  slack: gophercn:o5pSanyTeNhnfYc3QnG0X7Wx
diff --git a/conf/locale/locale_en-US.ini b/conf/locale/locale_en-US.ini
index 3fbc71cb14..8e768ae6ec 100644
--- a/conf/locale/locale_en-US.ini
+++ b/conf/locale/locale_en-US.ini
@@ -619,6 +619,7 @@ auths.smtp_auth = SMTP Authorization Type
 auths.smtphost = SMTP Host
 auths.smtpport = SMTP Port
 auths.enable_tls = Enable TLS Encryption
+auths.pam_service_name = PAM Service Name
 auths.enable_auto_register = Enable Auto Registration
 auths.tips = Tips
 auths.edit = Edit Authorization Setting
diff --git a/models/login.go b/models/login.go
index 916e27310c..8b773c1397 100644
--- a/models/login.go
+++ b/models/login.go
@@ -17,6 +17,7 @@ import (
 	"github.com/go-xorm/xorm"
 
 	"github.com/gogits/gogs/modules/auth/ldap"
+	"github.com/gogits/gogs/modules/auth/pam"
 	"github.com/gogits/gogs/modules/log"
 	"github.com/gogits/gogs/modules/uuid"
 )
@@ -28,6 +29,7 @@ const (
 	PLAIN
 	LDAP
 	SMTP
+	PAM
 )
 
 var (
@@ -39,12 +41,14 @@ var (
 var LoginTypes = map[LoginType]string{
 	LDAP: "LDAP",
 	SMTP: "SMTP",
+	PAM: "PAM",
 }
 
 // Ensure structs implemented interface.
 var (
 	_ core.Conversion = &LDAPConfig{}
 	_ core.Conversion = &SMTPConfig{}
+	_ core.Conversion = &PAMConfig{}
 )
 
 type LDAPConfig struct {
@@ -74,6 +78,18 @@ func (cfg *SMTPConfig) ToDB() ([]byte, error) {
 	return json.Marshal(cfg)
 }
 
+type PAMConfig struct {
+	ServiceName string // pam service (e.g. system-auth)
+}
+
+func (cfg *PAMConfig) FromDB(bs []byte) error {
+	return json.Unmarshal(bs, &cfg)
+}
+
+func (cfg *PAMConfig) ToDB() ([]byte, error) {
+	return json.Marshal(cfg)
+}
+
 type LoginSource struct {
 	Id                int64
 	Type              LoginType
@@ -97,6 +113,10 @@ func (source *LoginSource) SMTP() *SMTPConfig {
 	return source.Cfg.(*SMTPConfig)
 }
 
+func (source *LoginSource) PAM() *PAMConfig {
+	return source.Cfg.(*PAMConfig)
+}
+
 func (source *LoginSource) BeforeSet(colName string, val xorm.Cell) {
 	if colName == "type" {
 		ty := (*val).(int64)
@@ -105,6 +125,8 @@ func (source *LoginSource) BeforeSet(colName string, val xorm.Cell) {
 			source.Cfg = new(LDAPConfig)
 		case SMTP:
 			source.Cfg = new(SMTPConfig)
+		case PAM:
+			source.Cfg = new(PAMConfig)
 		}
 	}
 }
@@ -197,6 +219,13 @@ func UserSignIn(uname, passwd string) (*User, error) {
 					return u, nil
 				}
 				log.Warn("Fail to login(%s) by SMTP(%s): %v", uname, source.Name, err)
+			} else if source.Type == PAM {
+				u, err := LoginUserPAMSource(nil, uname, passwd,
+					source.Id, source.Cfg.(*PAMConfig), true)
+				if err == nil {
+					return u, nil
+				}
+				log.Warn("Fail to login(%s) by PAM(%s): %v", uname, source.Name, err)
 			}
 		}
 
@@ -218,6 +247,8 @@ func UserSignIn(uname, passwd string) (*User, error) {
 		return LoginUserLdapSource(u, u.LoginName, passwd, source.Id, source.Cfg.(*LDAPConfig), false)
 	case SMTP:
 		return LoginUserSMTPSource(u, u.LoginName, passwd, source.Id, source.Cfg.(*SMTPConfig), false)
+	case PAM:
+		return LoginUserPAMSource(u, u.LoginName, passwd, source.Id, source.Cfg.(*PAMConfig), false)
 	}
 	return nil, ErrUnsupportedLoginType
 }
@@ -359,3 +390,33 @@ func LoginUserSMTPSource(u *User, name, passwd string, sourceId int64, cfg *SMTP
 	err := CreateUser(u)
 	return u, err
 }
+
+// Query if name/passwd can login against PAM
+// Create a local user if success
+// Return the same LoginUserPlain semantic
+func LoginUserPAMSource(u *User, name, passwd string, sourceId int64, cfg *PAMConfig, autoRegister bool) (*User, error) {
+	if err := pam.PAMAuth(cfg.ServiceName, name, passwd); err != nil {
+		if strings.Contains(err.Error(), "Authentication failure") {
+			return nil, ErrUserNotExist
+		}
+		return nil, err
+	}
+
+	if !autoRegister {
+		return u, nil
+	}
+
+	// fake a local user creation
+	u = &User{
+		LowerName:   strings.ToLower(name),
+		Name:        strings.ToLower(name),
+		LoginType:   PAM,
+		LoginSource: sourceId,
+		LoginName:   name,
+		IsActive:    true,
+		Passwd:      passwd,
+		Email:       name,
+	}
+	err := CreateUser(u)
+	return u, err
+}
diff --git a/modules/auth/auth_form.go b/modules/auth/auth_form.go
index 7d45999914..1102dc3492 100644
--- a/modules/auth/auth_form.go
+++ b/modules/auth/auth_form.go
@@ -30,6 +30,7 @@ type AuthenticationForm struct {
 	SMTPPort          int    `form:"smtp_port"`
 	TLS               bool   `form:"tls"`
 	AllowAutoRegister bool   `form:"allowautoregister"`
+	PAMServiceName    string
 }
 
 func (f *AuthenticationForm) Validate(ctx *macaron.Context, errs binding.Errors) binding.Errors {
diff --git a/modules/auth/pam/pam.go b/modules/auth/pam/pam.go
new file mode 100644
index 0000000000..7d150b1c0b
--- /dev/null
+++ b/modules/auth/pam/pam.go
@@ -0,0 +1,35 @@
+// +build !windows
+
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pam
+
+import (
+	"errors"
+
+	"github.com/msteinert/pam"
+)
+
+func PAMAuth(serviceName, userName, passwd string) error {
+	t, err := pam.StartFunc(serviceName, userName, func(s pam.Style, msg string) (string, error) {
+		switch s {
+		case pam.PromptEchoOff:
+			return passwd, nil
+		case pam.PromptEchoOn, pam.ErrorMsg, pam.TextInfo:
+			return "", nil
+		}
+		return "", errors.New("Unrecognized PAM message style")
+	})
+
+	if err != nil {
+		return err
+	}
+
+	if err = t.Authenticate(0); err != nil {
+		return err
+	}
+
+	return nil
+}
diff --git a/modules/auth/pam/pam_stub.go b/modules/auth/pam/pam_stub.go
new file mode 100644
index 0000000000..2f210bf6e7
--- /dev/null
+++ b/modules/auth/pam/pam_stub.go
@@ -0,0 +1,15 @@
+// +build windows
+
+// Copyright 2014 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package pam
+
+import (
+	"errors"
+)
+
+func PAMAuth(serviceName, userName, passwd string) error {
+	return errors.New("PAM not supported")
+}
diff --git a/public/ng/js/gogs.js b/public/ng/js/gogs.js
index c5fd719c32..7ffef8af8b 100644
--- a/public/ng/js/gogs.js
+++ b/public/ng/js/gogs.js
@@ -753,10 +753,17 @@ function initAdmin() {
         if (v == 2) {
             $('.ldap').toggleShow();
             $('.smtp').toggleHide();
+            $('.pam').toggleHide();
         }
         if (v == 3) {
             $('.smtp').toggleShow();
             $('.ldap').toggleHide();
+            $('.pam').toggleHide();
+        }
+        if (v == 4) {
+            $('.pam').toggleShow();
+            $('.smtp').toggleHide();
+            $('.ldap').toggleHide();
         }
     });
 
diff --git a/routers/admin/auths.go b/routers/admin/auths.go
index b13b0bd134..2bec7da46c 100644
--- a/routers/admin/auths.go
+++ b/routers/admin/auths.go
@@ -84,6 +84,10 @@ func NewAuthSourcePost(ctx *middleware.Context, form auth.AuthenticationForm) {
 			Port: form.SMTPPort,
 			TLS:  form.TLS,
 		}
+	case models.PAM:
+		u = &models.PAMConfig{
+			ServiceName: form.PAMServiceName,
+		}
 	default:
 		ctx.Error(400)
 		return
@@ -166,6 +170,10 @@ func EditAuthSourcePost(ctx *middleware.Context, form auth.AuthenticationForm) {
 			Port: form.SMTPPort,
 			TLS:  form.TLS,
 		}
+	case models.PAM:
+		config = &models.PAMConfig{
+			ServiceName: form.PAMServiceName,
+		}
 	default:
 		ctx.Error(400)
 		return
diff --git a/templates/admin/auth/edit.tmpl b/templates/admin/auth/edit.tmpl
index a178b71756..12d1d1f8f2 100644
--- a/templates/admin/auth/edit.tmpl
+++ b/templates/admin/auth/edit.tmpl
@@ -91,6 +91,12 @@
                                     <label class="req" for="smtp_port">{{.i18n.Tr "admin.auths.smtpport"}}</label>
                                     <input class="ipt ipt-large ipt-radius {{if .Err_SmtpPort}}ipt-error{{end}}" id="smtp_port" name="smtp_port" value="{{.Source.SMTP.Port}}" />
                                 </div>
+
+                                {{else if eq $type 4}}
+                                <div class="field">
+                                    <label class="req" for="pam_service_name">{{.i18n.Tr "admin.auths.pam_service_name"}}</label>
+                                    <input class="ipt ipt-large ipt-radius {{if .Err_PAMServiceName}}ipt-error{{end}}" id="pam_service_name" name="pam_service_name" value="{{.Source.PAM.ServiceName}}" />
+                                </div>
                                 {{end}}
 
                                 <div class="field">
diff --git a/templates/admin/auth/new.tmpl b/templates/admin/auth/new.tmpl
index 0d1f2ab417..36b90cfb48 100644
--- a/templates/admin/auth/new.tmpl
+++ b/templates/admin/auth/new.tmpl
@@ -86,6 +86,12 @@
                                         <input class="ipt ipt-large ipt-radius {{if .Err_SmtpPort}}ipt-error{{end}}" id="smtp_port" name="smtp_port" value="{{.smtp_port}}" />
                                     </div>
                                 </div>
+                                <div class="pam hidden">
+                                    <div class="field">
+                                        <label class="req" for="pam_service_name">{{.i18n.Tr "admin.auths.pam_service_name"}}</label>
+                                        <input class="ipt ipt-large ipt-radius {{if .Err_PAMServiceName}}ipt-error{{end}}" id="pam_service_name" name="pam_service_name" value="{{.pam_service_name}}" />
+                                    </div>
+                                </div>
                                 <div class="field">
                                     <div class="smtp hidden">
                                         <label></label>