1
0
mirror of https://github.com/go-gitea/gitea.git synced 2024-12-04 14:46:57 -05:00
gitea/routers/web/admin/auths.go
techknowlogick 5bb8d1924d
Support SAML authentication (#25165)
Closes https://github.com/go-gitea/gitea/issues/5512

This PR adds basic SAML support
- Adds SAML 2.0 as an auth source
- Adds SAML configuration documentation
- Adds integration test:
- Use bare-bones SAML IdP to test protocol flow and test account is
linked successfully (only runs on Postgres by default)
- Adds documentation for configuring and running SAML integration test
locally

Future PRs:
- Support group mapping
- Support auto-registration (account linking)

Co-Authored-By: @jackHay22

---------

Co-authored-by: jackHay22 <jack@allspice.io>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: KN4CK3R <admin@oldschoolhack.me>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: morphelinho <morphelinho@users.noreply.github.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-authored-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: silverwind <me@silverwind.io>
2024-02-23 00:08:17 +00:00

549 lines
18 KiB
Go

// Copyright 2014 The Gogs Authors. All rights reserved.
// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package admin
import (
"crypto/tls"
"crypto/x509"
"errors"
"fmt"
"net/http"
"net/url"
"regexp"
"strconv"
"strings"
"code.gitea.io/gitea/models/auth"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/auth/pam"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/web"
auth_service "code.gitea.io/gitea/services/auth"
"code.gitea.io/gitea/services/auth/source/ldap"
"code.gitea.io/gitea/services/auth/source/oauth2"
pam_service "code.gitea.io/gitea/services/auth/source/pam"
"code.gitea.io/gitea/services/auth/source/saml"
"code.gitea.io/gitea/services/auth/source/smtp"
"code.gitea.io/gitea/services/auth/source/sspi"
"code.gitea.io/gitea/services/forms"
"xorm.io/xorm/convert"
)
const (
tplAuths base.TplName = "admin/auth/list"
tplAuthNew base.TplName = "admin/auth/new"
tplAuthEdit base.TplName = "admin/auth/edit"
)
var (
separatorAntiPattern = regexp.MustCompile(`[^\w-\.]`)
langCodePattern = regexp.MustCompile(`^[a-z]{2}-[A-Z]{2}$`)
)
// Authentications show authentication config page
func Authentications(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("admin.authentication")
ctx.Data["PageIsAdminAuthentications"] = true
var err error
ctx.Data["Sources"], ctx.Data["Total"], err = db.FindAndCount[auth.Source](ctx, auth.FindSourcesOptions{})
if err != nil {
ctx.ServerError("auth.Sources", err)
return
}
ctx.HTML(http.StatusOK, tplAuths)
}
type dropdownItem struct {
Name string
Type any
}
var (
authSources = func() []dropdownItem {
items := []dropdownItem{
{auth.LDAP.String(), auth.LDAP},
{auth.DLDAP.String(), auth.DLDAP},
{auth.SMTP.String(), auth.SMTP},
{auth.OAuth2.String(), auth.OAuth2},
{auth.SSPI.String(), auth.SSPI},
{auth.SAML.String(), auth.SAML},
}
if pam.Supported {
items = append(items, dropdownItem{auth.Names[auth.PAM], auth.PAM})
}
return items
}()
securityProtocols = []dropdownItem{
{ldap.SecurityProtocolNames[ldap.SecurityProtocolUnencrypted], ldap.SecurityProtocolUnencrypted},
{ldap.SecurityProtocolNames[ldap.SecurityProtocolLDAPS], ldap.SecurityProtocolLDAPS},
{ldap.SecurityProtocolNames[ldap.SecurityProtocolStartTLS], ldap.SecurityProtocolStartTLS},
}
nameIDFormats = []dropdownItem{
{saml.NameIDFormatNames[saml.SAML20Persistent], saml.SAML20Persistent}, // use this as default value
{saml.NameIDFormatNames[saml.SAML11Email], saml.SAML11Email},
{saml.NameIDFormatNames[saml.SAML11Persistent], saml.SAML11Persistent},
{saml.NameIDFormatNames[saml.SAML11Unspecified], saml.SAML11Unspecified},
{saml.NameIDFormatNames[saml.SAML20Email], saml.SAML20Email},
{saml.NameIDFormatNames[saml.SAML20Transient], saml.SAML20Transient},
{saml.NameIDFormatNames[saml.SAML20Unspecified], saml.SAML20Unspecified},
}
)
// NewAuthSource render adding a new auth source page
func NewAuthSource(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("admin.auths.new")
ctx.Data["PageIsAdminAuthentications"] = true
ctx.Data["type"] = auth.LDAP.Int()
ctx.Data["CurrentTypeName"] = auth.Names[auth.LDAP]
ctx.Data["CurrentSecurityProtocol"] = ldap.SecurityProtocolNames[ldap.SecurityProtocolUnencrypted]
ctx.Data["smtp_auth"] = "PLAIN"
ctx.Data["is_active"] = true
ctx.Data["is_sync_enabled"] = true
ctx.Data["AuthSources"] = authSources
ctx.Data["SecurityProtocols"] = securityProtocols
ctx.Data["CurrentNameIDFormat"] = saml.NameIDFormatNames[saml.SAML20Persistent]
ctx.Data["NameIDFormats"] = nameIDFormats
ctx.Data["SMTPAuths"] = smtp.Authenticators
oauth2providers := oauth2.GetSupportedOAuth2Providers()
ctx.Data["OAuth2Providers"] = oauth2providers
ctx.Data["SSPIAutoCreateUsers"] = true
ctx.Data["SSPIAutoActivateUsers"] = true
ctx.Data["SSPIStripDomainNames"] = true
ctx.Data["SSPISeparatorReplacement"] = "_"
ctx.Data["SSPIDefaultLanguage"] = ""
// only the first as default
ctx.Data["oauth2_provider"] = oauth2providers[0].Name()
ctx.HTML(http.StatusOK, tplAuthNew)
}
func parseLDAPConfig(form forms.AuthenticationForm) *ldap.Source {
var pageSize uint32
if form.UsePagedSearch {
pageSize = uint32(form.SearchPageSize)
}
return &ldap.Source{
Name: form.Name,
Host: form.Host,
Port: form.Port,
SecurityProtocol: ldap.SecurityProtocol(form.SecurityProtocol),
SkipVerify: form.SkipVerify,
BindDN: form.BindDN,
UserDN: form.UserDN,
BindPassword: form.BindPassword,
UserBase: form.UserBase,
AttributeUsername: form.AttributeUsername,
AttributeName: form.AttributeName,
AttributeSurname: form.AttributeSurname,
AttributeMail: form.AttributeMail,
AttributesInBind: form.AttributesInBind,
AttributeSSHPublicKey: form.AttributeSSHPublicKey,
AttributeAvatar: form.AttributeAvatar,
SearchPageSize: pageSize,
Filter: form.Filter,
GroupsEnabled: form.GroupsEnabled,
GroupDN: form.GroupDN,
GroupFilter: form.GroupFilter,
GroupMemberUID: form.GroupMemberUID,
GroupTeamMap: form.GroupTeamMap,
GroupTeamMapRemoval: form.GroupTeamMapRemoval,
UserUID: form.UserUID,
AdminFilter: form.AdminFilter,
RestrictedFilter: form.RestrictedFilter,
AllowDeactivateAll: form.AllowDeactivateAll,
Enabled: true,
SkipLocalTwoFA: form.SkipLocalTwoFA,
}
}
func parseSMTPConfig(form forms.AuthenticationForm) *smtp.Source {
return &smtp.Source{
Auth: form.SMTPAuth,
Host: form.SMTPHost,
Port: form.SMTPPort,
AllowedDomains: form.AllowedDomains,
ForceSMTPS: form.ForceSMTPS,
SkipVerify: form.SkipVerify,
HeloHostname: form.HeloHostname,
DisableHelo: form.DisableHelo,
SkipLocalTwoFA: form.SkipLocalTwoFA,
}
}
func parseOAuth2Config(form forms.AuthenticationForm) *oauth2.Source {
var customURLMapping *oauth2.CustomURLMapping
if form.Oauth2UseCustomURL {
customURLMapping = &oauth2.CustomURLMapping{
TokenURL: form.Oauth2TokenURL,
AuthURL: form.Oauth2AuthURL,
ProfileURL: form.Oauth2ProfileURL,
EmailURL: form.Oauth2EmailURL,
Tenant: form.Oauth2Tenant,
}
} else {
customURLMapping = nil
}
var scopes []string
for _, s := range strings.Split(form.Oauth2Scopes, ",") {
s = strings.TrimSpace(s)
if s != "" {
scopes = append(scopes, s)
}
}
return &oauth2.Source{
Provider: form.Oauth2Provider,
ClientID: form.Oauth2Key,
ClientSecret: form.Oauth2Secret,
OpenIDConnectAutoDiscoveryURL: form.OpenIDConnectAutoDiscoveryURL,
CustomURLMapping: customURLMapping,
IconURL: form.Oauth2IconURL,
Scopes: scopes,
RequiredClaimName: form.Oauth2RequiredClaimName,
RequiredClaimValue: form.Oauth2RequiredClaimValue,
SkipLocalTwoFA: form.SkipLocalTwoFA,
GroupClaimName: form.Oauth2GroupClaimName,
RestrictedGroup: form.Oauth2RestrictedGroup,
AdminGroup: form.Oauth2AdminGroup,
GroupTeamMap: form.Oauth2GroupTeamMap,
GroupTeamMapRemoval: form.Oauth2GroupTeamMapRemoval,
}
}
func parseSSPIConfig(ctx *context.Context, form forms.AuthenticationForm) (*sspi.Source, error) {
if util.IsEmptyString(form.SSPISeparatorReplacement) {
ctx.Data["Err_SSPISeparatorReplacement"] = true
return nil, errors.New(ctx.Locale.TrString("form.SSPISeparatorReplacement") + ctx.Locale.TrString("form.require_error"))
}
if separatorAntiPattern.MatchString(form.SSPISeparatorReplacement) {
ctx.Data["Err_SSPISeparatorReplacement"] = true
return nil, errors.New(ctx.Locale.TrString("form.SSPISeparatorReplacement") + ctx.Locale.TrString("form.alpha_dash_dot_error"))
}
if form.SSPIDefaultLanguage != "" && !langCodePattern.MatchString(form.SSPIDefaultLanguage) {
ctx.Data["Err_SSPIDefaultLanguage"] = true
return nil, errors.New(ctx.Locale.TrString("form.lang_select_error"))
}
return &sspi.Source{
AutoCreateUsers: form.SSPIAutoCreateUsers,
AutoActivateUsers: form.SSPIAutoActivateUsers,
StripDomainNames: form.SSPIStripDomainNames,
SeparatorReplacement: form.SSPISeparatorReplacement,
DefaultLanguage: form.SSPIDefaultLanguage,
}, nil
}
func parseSAMLConfig(ctx *context.Context, form forms.AuthenticationForm) (*saml.Source, error) {
if util.IsEmptyString(form.IdentityProviderMetadata) && util.IsEmptyString(form.IdentityProviderMetadataURL) {
return nil, fmt.Errorf("%s %s", ctx.Tr("form.SAMLMetadata"), ctx.Tr("form.require_error"))
}
if !util.IsEmptyString(form.IdentityProviderMetadataURL) {
_, err := url.Parse(form.IdentityProviderMetadataURL)
if err != nil {
return nil, fmt.Errorf("%s", ctx.Tr("form.SAMLMetadataURL"))
}
}
// check the integrity of the certificate and private key (autogenerated if these form fields are blank)
if !util.IsEmptyString(form.ServiceProviderCertificate) && !util.IsEmptyString(form.ServiceProviderPrivateKey) {
keyPair, err := tls.X509KeyPair([]byte(form.ServiceProviderCertificate), []byte(form.ServiceProviderPrivateKey))
if err != nil {
return nil, err
}
keyPair.Leaf, err = x509.ParseCertificate(keyPair.Certificate[0])
if err != nil {
return nil, err
}
} else {
privateKey, cert, err := saml.GenerateSAMLSPKeypair()
if err != nil {
return nil, err
}
form.ServiceProviderPrivateKey = privateKey
form.ServiceProviderCertificate = cert
}
return &saml.Source{
IdentityProviderMetadata: form.IdentityProviderMetadata,
IdentityProviderMetadataURL: form.IdentityProviderMetadataURL,
InsecureSkipAssertionSignatureValidation: form.InsecureSkipAssertionSignatureValidation,
NameIDFormat: saml.NameIDFormat(form.NameIDFormat),
ServiceProviderCertificate: form.ServiceProviderCertificate,
ServiceProviderPrivateKey: form.ServiceProviderPrivateKey,
EmailAssertionKey: form.EmailAssertionKey,
NameAssertionKey: form.NameAssertionKey,
UsernameAssertionKey: form.UsernameAssertionKey,
IconURL: form.SAMLIconURL,
}, nil
}
// NewAuthSourcePost response for adding an auth source
func NewAuthSourcePost(ctx *context.Context) {
form := *web.GetForm(ctx).(*forms.AuthenticationForm)
ctx.Data["Title"] = ctx.Tr("admin.auths.new")
ctx.Data["PageIsAdminAuthentications"] = true
ctx.Data["CurrentTypeName"] = auth.Type(form.Type).String()
ctx.Data["CurrentSecurityProtocol"] = ldap.SecurityProtocolNames[ldap.SecurityProtocol(form.SecurityProtocol)]
ctx.Data["AuthSources"] = authSources
ctx.Data["SecurityProtocols"] = securityProtocols
ctx.Data["SMTPAuths"] = smtp.Authenticators
oauth2providers := oauth2.GetSupportedOAuth2Providers()
ctx.Data["OAuth2Providers"] = oauth2providers
ctx.Data["CurrentNameIDFormat"] = saml.NameIDFormatNames[saml.NameIDFormat(form.NameIDFormat)]
ctx.Data["NameIDFormats"] = nameIDFormats
ctx.Data["SSPIAutoCreateUsers"] = true
ctx.Data["SSPIAutoActivateUsers"] = true
ctx.Data["SSPIStripDomainNames"] = true
ctx.Data["SSPISeparatorReplacement"] = "_"
ctx.Data["SSPIDefaultLanguage"] = ""
hasTLS := false
var config convert.Conversion
switch auth.Type(form.Type) {
case auth.LDAP, auth.DLDAP:
config = parseLDAPConfig(form)
hasTLS = ldap.SecurityProtocol(form.SecurityProtocol) > ldap.SecurityProtocolUnencrypted
case auth.SMTP:
config = parseSMTPConfig(form)
hasTLS = true
case auth.PAM:
config = &pam_service.Source{
ServiceName: form.PAMServiceName,
EmailDomain: form.PAMEmailDomain,
SkipLocalTwoFA: form.SkipLocalTwoFA,
}
case auth.OAuth2:
config = parseOAuth2Config(form)
oauth2Config := config.(*oauth2.Source)
if oauth2Config.Provider == "openidConnect" {
discoveryURL, err := url.Parse(oauth2Config.OpenIDConnectAutoDiscoveryURL)
if err != nil || (discoveryURL.Scheme != "http" && discoveryURL.Scheme != "https") {
ctx.Data["Err_DiscoveryURL"] = true
ctx.RenderWithErr(ctx.Tr("admin.auths.invalid_openIdConnectAutoDiscoveryURL"), tplAuthNew, form)
return
}
}
case auth.SSPI:
var err error
config, err = parseSSPIConfig(ctx, form)
if err != nil {
ctx.RenderWithErr(err.Error(), tplAuthNew, form)
return
}
existing, err := db.Find[auth.Source](ctx, auth.FindSourcesOptions{LoginType: auth.SSPI})
if err != nil || len(existing) > 0 {
ctx.Data["Err_Type"] = true
ctx.RenderWithErr(ctx.Tr("admin.auths.login_source_of_type_exist"), tplAuthNew, form)
return
}
case auth.SAML:
var err error
config, err = parseSAMLConfig(ctx, form)
if err != nil {
ctx.RenderWithErr(err.Error(), tplAuthNew, form)
return
}
default:
ctx.Error(http.StatusBadRequest)
return
}
ctx.Data["HasTLS"] = hasTLS
if ctx.HasError() {
ctx.HTML(http.StatusOK, tplAuthNew)
return
}
if err := auth.CreateSource(ctx, &auth.Source{
Type: auth.Type(form.Type),
Name: form.Name,
IsActive: form.IsActive,
IsSyncEnabled: form.IsSyncEnabled,
Cfg: config,
}); err != nil {
if auth.IsErrSourceAlreadyExist(err) {
ctx.Data["Err_Name"] = true
ctx.RenderWithErr(ctx.Tr("admin.auths.login_source_exist", err.(auth.ErrSourceAlreadyExist).Name), tplAuthNew, form)
} else if oauth2.IsErrOpenIDConnectInitialize(err) {
ctx.Data["Err_DiscoveryURL"] = true
unwrapped := err.(oauth2.ErrOpenIDConnectInitialize).Unwrap()
ctx.RenderWithErr(ctx.Tr("admin.auths.unable_to_initialize_openid", unwrapped), tplAuthNew, form)
} else {
ctx.ServerError("auth.CreateSource", err)
}
return
}
log.Trace("Authentication created by admin(%s): %s", ctx.Doer.Name, form.Name)
ctx.Flash.Success(ctx.Tr("admin.auths.new_success", form.Name))
ctx.Redirect(setting.AppSubURL + "/admin/auths")
}
// EditAuthSource render editing auth source page
func EditAuthSource(ctx *context.Context) {
ctx.Data["Title"] = ctx.Tr("admin.auths.edit")
ctx.Data["PageIsAdminAuthentications"] = true
ctx.Data["SecurityProtocols"] = securityProtocols
ctx.Data["SMTPAuths"] = smtp.Authenticators
oauth2providers := oauth2.GetSupportedOAuth2Providers()
ctx.Data["OAuth2Providers"] = oauth2providers
ctx.Data["NameIDFormats"] = nameIDFormats
source, err := auth.GetSourceByID(ctx, ctx.ParamsInt64(":authid"))
if err != nil {
ctx.ServerError("auth.GetSourceByID", err)
return
}
ctx.Data["Source"] = source
ctx.Data["HasTLS"] = source.HasTLS()
if source.IsSAML() {
ctx.Data["CurrentNameIDFormat"] = saml.NameIDFormatNames[source.Cfg.(*saml.Source).NameIDFormat]
}
if source.IsOAuth2() {
type Named interface {
Name() string
}
for _, provider := range oauth2providers {
if provider.Name() == source.Cfg.(Named).Name() {
ctx.Data["CurrentOAuth2Provider"] = provider
break
}
}
}
ctx.HTML(http.StatusOK, tplAuthEdit)
}
// EditAuthSourcePost response for editing auth source
func EditAuthSourcePost(ctx *context.Context) {
form := *web.GetForm(ctx).(*forms.AuthenticationForm)
ctx.Data["Title"] = ctx.Tr("admin.auths.edit")
ctx.Data["PageIsAdminAuthentications"] = true
ctx.Data["SMTPAuths"] = smtp.Authenticators
oauth2providers := oauth2.GetSupportedOAuth2Providers()
ctx.Data["OAuth2Providers"] = oauth2providers
source, err := auth.GetSourceByID(ctx, ctx.ParamsInt64(":authid"))
if err != nil {
ctx.ServerError("auth.GetSourceByID", err)
return
}
ctx.Data["Source"] = source
ctx.Data["HasTLS"] = source.HasTLS()
ctx.Data["CurrentNameIDFormat"] = saml.NameIDFormatNames[saml.SAML20Persistent]
ctx.Data["NameIDFormats"] = nameIDFormats
if ctx.HasError() {
ctx.HTML(http.StatusOK, tplAuthEdit)
return
}
var config convert.Conversion
switch auth.Type(form.Type) {
case auth.LDAP, auth.DLDAP:
config = parseLDAPConfig(form)
case auth.SMTP:
config = parseSMTPConfig(form)
case auth.PAM:
config = &pam_service.Source{
ServiceName: form.PAMServiceName,
EmailDomain: form.PAMEmailDomain,
}
case auth.OAuth2:
config = parseOAuth2Config(form)
oauth2Config := config.(*oauth2.Source)
if oauth2Config.Provider == "openidConnect" {
discoveryURL, err := url.Parse(oauth2Config.OpenIDConnectAutoDiscoveryURL)
if err != nil || (discoveryURL.Scheme != "http" && discoveryURL.Scheme != "https") {
ctx.Data["Err_DiscoveryURL"] = true
ctx.RenderWithErr(ctx.Tr("admin.auths.invalid_openIdConnectAutoDiscoveryURL"), tplAuthEdit, form)
return
}
}
case auth.SSPI:
config, err = parseSSPIConfig(ctx, form)
if err != nil {
ctx.RenderWithErr(err.Error(), tplAuthEdit, form)
return
}
case auth.SAML:
config, err = parseSAMLConfig(ctx, form)
if err != nil {
ctx.RenderWithErr(err.Error(), tplAuthEdit, form)
return
}
default:
ctx.Error(http.StatusBadRequest)
return
}
source.Name = form.Name
source.IsActive = form.IsActive
source.IsSyncEnabled = form.IsSyncEnabled
source.Cfg = config
if err := auth.UpdateSource(ctx, source); err != nil {
if auth.IsErrSourceAlreadyExist(err) {
ctx.Data["Err_Name"] = true
ctx.RenderWithErr(ctx.Tr("admin.auths.login_source_exist", err.(auth.ErrSourceAlreadyExist).Name), tplAuthEdit, form)
} else if oauth2.IsErrOpenIDConnectInitialize(err) {
ctx.Flash.Error(err.Error(), true)
ctx.Data["Err_DiscoveryURL"] = true
ctx.HTML(http.StatusOK, tplAuthEdit)
} else {
ctx.ServerError("UpdateSource", err)
}
return
}
log.Trace("Authentication changed by admin(%s): %d", ctx.Doer.Name, source.ID)
ctx.Flash.Success(ctx.Tr("admin.auths.update_success"))
ctx.Redirect(setting.AppSubURL + "/admin/auths/" + strconv.FormatInt(form.ID, 10))
}
// DeleteAuthSource response for deleting an auth source
func DeleteAuthSource(ctx *context.Context) {
source, err := auth.GetSourceByID(ctx, ctx.ParamsInt64(":authid"))
if err != nil {
ctx.ServerError("auth.GetSourceByID", err)
return
}
if err = auth_service.DeleteSource(ctx, source); err != nil {
if auth.IsErrSourceInUse(err) {
ctx.Flash.Error(ctx.Tr("admin.auths.still_in_used"))
} else {
ctx.Flash.Error(fmt.Sprintf("auth_service.DeleteSource: %v", err))
}
ctx.JSONRedirect(setting.AppSubURL + "/admin/auths/" + url.PathEscape(ctx.Params(":authid")))
return
}
log.Trace("Authentication deleted by admin(%s): %d", ctx.Doer.Name, source.ID)
ctx.Flash.Success(ctx.Tr("admin.auths.deletion_success"))
ctx.JSONRedirect(setting.AppSubURL + "/admin/auths")
}