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outposts/ldap: move virtual groups to other OU for lookups, conditionally skip requests based on search filter 

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>
This commit is contained in:
Jens Langhammer 2021-08-21 17:53:09 +02:00
parent 23fd257624
commit 294d70ae4d
8 changed files with 92 additions and 39 deletions
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4
authentik/core/api/users.py
View File

@ -150,8 +150,8 @@ class UsersFilter(FilterSet):
is_superuser = BooleanFilter(field_name="ak_groups", lookup_expr="is_superuser")
groups_by_name = ModelMultipleChoiceFilter(
field_name="ak_groups__username",
to_field_name="username",
field_name="ak_groups__name",
to_field_name="name",
queryset=Group.objects.all(),
)
groups_by_pk = ModelMultipleChoiceFilter(

12
internal/outpost/ldap/api.go
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@ -15,6 +15,12 @@ import (
log "github.com/sirupsen/logrus"
)
const (
UsersOU = "users"
GroupsOU = "groups"
VirtualGroupsOU = "virtual-groups"
)
func (ls *LDAPServer) Refresh() error {
outposts, _, err := ls.ac.Client.OutpostsApi.OutpostsLdapList(context.Background()).Execute()
if err != nil {
@ -25,11 +31,13 @@ func (ls *LDAPServer) Refresh() error {
}
providers := make([]*ProviderInstance, len(outposts.Results))
for idx, provider := range outposts.Results {
userDN := strings.ToLower(fmt.Sprintf("ou=users,%s", *provider.BaseDn))
groupDN := strings.ToLower(fmt.Sprintf("ou=groups,%s", *provider.BaseDn))
userDN := strings.ToLower(fmt.Sprintf("ou=%s,%s", UsersOU, *provider.BaseDn))
groupDN := strings.ToLower(fmt.Sprintf("ou=%s,%s", GroupsOU, *provider.BaseDn))
virtualGroupDN := strings.ToLower(fmt.Sprintf("ou=%s,%s", VirtualGroupsOU, *provider.BaseDn))
logger := log.WithField("logger", "authentik.outpost.ldap").WithField("provider", provider.Name)
providers[idx] = &ProviderInstance{
BaseDN: *provider.BaseDn,
VirtualGroupDN: virtualGroupDN,
GroupDN: groupDN,
UserDN: userDN,
appSlug: provider.ApplicationSlug,

25
internal/outpost/ldap/instance_search.go
View File

@ -59,6 +59,10 @@ func (pi *ProviderInstance) Search(req SearchRequest) (ldap.ServerSearchResult,
return ldap.ServerSearchResult{ResultCode: ldap.LDAPResultOperationsError}, fmt.Errorf("Search Error: error parsing filter: %s", req.Filter)
}
// Create a custom client to set additional headers
c := api.NewAPIClient(pi.s.ac.Client.GetConfig())
c.GetConfig().AddDefaultHeader("X-authentik-outpost-ldap-query", req.Filter)
switch filterEntity {
default:
return ldap.ServerSearchResult{ResultCode: ldap.LDAPResultOperationsError}, fmt.Errorf("Search Error: unhandled filter type: %s [%s]", filterEntity, req.Filter)
@ -72,7 +76,12 @@ func (pi *ProviderInstance) Search(req SearchRequest) (ldap.ServerSearchResult,
go func() {
defer wg.Done()
gapisp := sentry.StartSpan(req.ctx, "authentik.providers.ldap.search.api_group")
groups, _, err := parseFilterForGroup(pi.s.ac.Client.CoreApi.CoreGroupsList(gapisp.Context()), parsedFilter).Execute()
searchReq, skip := parseFilterForGroup(c.CoreApi.CoreGroupsList(gapisp.Context()), parsedFilter, false)
if skip {
pi.log.Trace("Skip backend request")
return
}
groups, _, err := searchReq.Execute()
gapisp.Finish()
if err != nil {
req.log.WithError(err).Warning("failed to get groups")
@ -88,7 +97,12 @@ func (pi *ProviderInstance) Search(req SearchRequest) (ldap.ServerSearchResult,
go func() {
defer wg.Done()
uapisp := sentry.StartSpan(req.ctx, "authentik.providers.ldap.search.api_user")
users, _, err := parseFilterForUser(pi.s.ac.Client.CoreApi.CoreUsersList(uapisp.Context()), parsedFilter).Execute()
searchReq, skip := parseFilterForUser(c.CoreApi.CoreUsersList(uapisp.Context()), parsedFilter, false)
if skip {
pi.log.Trace("Skip backend request")
return
}
users, _, err := searchReq.Execute()
uapisp.Finish()
if err != nil {
req.log.WithError(err).Warning("failed to get users")
@ -103,7 +117,12 @@ func (pi *ProviderInstance) Search(req SearchRequest) (ldap.ServerSearchResult,
entries = append(gEntries, uEntries...)
case UserObjectClass, "":
uapisp := sentry.StartSpan(req.ctx, "authentik.providers.ldap.search.api_user")
users, _, err := parseFilterForUser(pi.s.ac.Client.CoreApi.CoreUsersList(uapisp.Context()), parsedFilter).Execute()
searchReq, skip := parseFilterForUser(c.CoreApi.CoreUsersList(uapisp.Context()), parsedFilter, false)
if skip {
pi.log.Trace("Skip backend request")
return ldap.ServerSearchResult{Entries: entries, Referrals: []string{}, Controls: []ldap.Control{}, ResultCode: ldap.LDAPResultSuccess}, nil
}
users, _, err := searchReq.Execute()
uapisp.Finish()
if err != nil {

36
internal/outpost/ldap/instance_search_group.go
View File

@ -7,52 +7,62 @@ import (
"goauthentik.io/api"
)
func parseFilterForGroup(req api.ApiCoreGroupsListRequest, f *ber.Packet) api.ApiCoreGroupsListRequest {
func parseFilterForGroup(req api.ApiCoreGroupsListRequest, f *ber.Packet, skip bool) (api.ApiCoreGroupsListRequest, bool) {
switch f.Tag {
case ldap.FilterEqualityMatch:
return parseFilterForGroupSingle(req, f)
case ldap.FilterAnd:
for _, child := range f.Children {
req = parseFilterForGroup(req, child)
r, s := parseFilterForGroup(req, child, skip)
skip = skip || s
req = r
}
return req
return req, skip
}
return req
return req, skip
}
func parseFilterForGroupSingle(req api.ApiCoreGroupsListRequest, f *ber.Packet) api.ApiCoreGroupsListRequest {
func parseFilterForGroupSingle(req api.ApiCoreGroupsListRequest, f *ber.Packet) (api.ApiCoreGroupsListRequest, bool) {
// We can only handle key = value pairs here
if len(f.Children) < 2 {
return req
return req, false
}
k := f.Children[0].Value
// Ensure key is string
if _, ok := k.(string); !ok {
return req
return req, false
}
v := f.Children[1].Value
// Null values are ignored
if v == nil {
return req
return req, false
}
// Switch on type of the value, then check the key
switch vv := v.(type) {
case string:
switch k {
case "cn":
return req.Name(vv)
return req.Name(vv), false
case "member":
fallthrough
case "memberOf":
userDN, err := goldap.ParseDN(vv)
if err != nil {
return req
return req.MembersByUsername([]string{vv}), false
}
username := userDN.RDNs[0].Attributes[0].Value
return req.MembersByUsername([]string{username})
// If the DN's first ou is virtual-groups, ignore this filter
if len(userDN.RDNs) > 1 {
if userDN.RDNs[1].Attributes[0].Value == VirtualGroupsOU || userDN.RDNs[1].Attributes[0].Value == GroupsOU {
// Since we know we're not filtering anything, skip this request
return req, true
}
}
return req.MembersByUsername([]string{username}), false
}
// TODO: Support int
default:
return req
return req, false
}
return req
return req, false
}

40
internal/outpost/ldap/instance_search_user.go
View File

@ -7,57 +7,67 @@ import (
"goauthentik.io/api"
)
func parseFilterForUser(req api.ApiCoreUsersListRequest, f *ber.Packet) api.ApiCoreUsersListRequest {
func parseFilterForUser(req api.ApiCoreUsersListRequest, f *ber.Packet, skip bool) (api.ApiCoreUsersListRequest, bool) {
switch f.Tag {
case ldap.FilterEqualityMatch:
return parseFilterForUserSingle(req, f)
case ldap.FilterAnd:
for _, child := range f.Children {
req = parseFilterForUser(req, child)
r, s := parseFilterForUser(req, child, skip)
skip = skip || s
req = r
}
return req
return req, skip
}
return req
return req, skip
}
func parseFilterForUserSingle(req api.ApiCoreUsersListRequest, f *ber.Packet) api.ApiCoreUsersListRequest {
func parseFilterForUserSingle(req api.ApiCoreUsersListRequest, f *ber.Packet) (api.ApiCoreUsersListRequest, bool) {
// We can only handle key = value pairs here
if len(f.Children) < 2 {
return req
return req, false
}
k := f.Children[0].Value
// Ensure key is string
if _, ok := k.(string); !ok {
return req
return req, false
}
v := f.Children[1].Value
// Null values are ignored
if v == nil {
return req
return req, false
}
// Switch on type of the value, then check the key
switch vv := v.(type) {
case string:
switch k {
case "cn":
return req.Username(vv)
return req.Username(vv), false
case "name":
case "displayName":
return req.Name(vv)
return req.Name(vv), false
case "mail":
return req.Email(vv)
return req.Email(vv), false
case "member":
fallthrough
case "memberOf":
groupDN, err := goldap.ParseDN(vv)
if err != nil {
return req
return req.GroupsByName([]string{vv}), false
}
name := groupDN.RDNs[0].Attributes[0].Value
return req.GroupsByName([]string{name})
// If the DN's first ou is virtual-groups, ignore this filter
if len(groupDN.RDNs) > 1 {
if groupDN.RDNs[1].Attributes[0].Value == UsersOU || groupDN.RDNs[1].Attributes[0].Value == VirtualGroupsOU {
// Since we know we're not filtering anything, skip this request
return req, true
}
}
return req.GroupsByName([]string{name}), false
}
// TODO: Support int
default:
return req
return req, false
}
return req
return req, false
}

2
internal/outpost/ldap/ldap.go
View File

@ -20,6 +20,8 @@ type ProviderInstance struct {
BaseDN string
UserDN string
VirtualGroupDN string
GroupDN string
appSlug string

6
internal/outpost/ldap/utils.go
View File

@ -95,7 +95,7 @@ func (pi *ProviderInstance) APIGroupToLDAPGroup(g api.Group) LDAPGroup {
func (pi *ProviderInstance) APIUserToLDAPGroup(u api.User) LDAPGroup {
return LDAPGroup{
dn: pi.GetGroupDN(u.Username),
dn: pi.GetVirtualGroupDN(u.Username),
cn: u.Username,
uid: u.Uid,
gidNumber: pi.GetUidNumber(u),
@ -114,6 +114,10 @@ func (pi *ProviderInstance) GetGroupDN(group string) string {
return fmt.Sprintf("cn=%s,%s", group, pi.GroupDN)
}
func (pi *ProviderInstance) GetVirtualGroupDN(group string) string {
return fmt.Sprintf("cn=%s,%s", group, pi.VirtualGroupDN)
}
func (pi *ProviderInstance) GetUidNumber(user api.User) string {
return strconv.FormatInt(int64(pi.uidStartNumber+user.Pk), 10)
}

2
website/docs/providers/ldap.md
View File

@ -14,7 +14,7 @@ Binding against the LDAP Server uses a flow in the background. This allows you t
You can configure under which base DN the information should be available. For this documentation we'll use the default of `DC=ldap,DC=goauthentik,DC=io`.
Users are available under `ou=users,<base DN>` and groups under `ou=groups,<base DN>`.
Users are available under `ou=users,<base DN>` and groups under `ou=groups,<base DN>`. To aid compatibility, each user belongs to its own "virtual" group, as is standard on most Unix-like systems. This group does not exist in the authentik database, and is generated on the fly. These virtual groups are under the `ou=virtual-groups,<base DN>` DN.
You can bind using the DN `cn=<username>,ou=users,<base DN>`, or using the following ldapsearch command for example: