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Fix group filter for ldap source sync (#22506)
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There are 2 separate flows of creating a user: authentication and source
sync.
When a group filter is defined, source sync ignores group filter, while
authentication respects it.
With this PR I've fixed this behavior, so both flows now apply this
filter when searching users in LDAP in a unified way.

- Unified LDAP group membership lookup for authentication and source
sync flows
- Replaced custom group membership lookup (used for authentication flow)
with an existing listLdapGroupMemberships method (used for source sync
flow)
- Modified listLdapGroupMemberships and getUserAttributeListedInGroup in
a way group lookup could be called separately
- Added user filtering based on a group membership for a source sync
- Added tests to cover this logic

Co-authored-by: Pavel Ezhov <paejov@gmail.com>
Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
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@pezhovski @lunny
3 people authored Feb 2, 2023
1 parent 9ef8bfb commit 98770d3
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Showing 2 changed files with 159 additions and 77 deletions.
137 changes: 71 additions & 66 deletions services/auth/source/ldap/source_search.go
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Original file line number Diff line number Diff line change
Expand Up @@ -196,22 +196,39 @@ func checkRestricted(l *ldap.Conn, ls *Source, userDN string) bool {
}

// List all group memberships of a user
func (source *Source) listLdapGroupMemberships(l *ldap.Conn, uid string) []string {
func (source *Source) listLdapGroupMemberships(l *ldap.Conn, uid string, applyGroupFilter bool) []string {
var ldapGroups []string
groupFilter := fmt.Sprintf("(%s=%s)", source.GroupMemberUID, ldap.EscapeFilter(uid))
var searchFilter string

groupFilter, ok := source.sanitizedGroupFilter(source.GroupFilter)
if !ok {
return ldapGroups
}

groupDN, ok := source.sanitizedGroupDN(source.GroupDN)
if !ok {
return ldapGroups
}

if applyGroupFilter {
searchFilter = fmt.Sprintf("(&(%s)(%s=%s))", groupFilter, source.GroupMemberUID, ldap.EscapeFilter(uid))
} else {
searchFilter = fmt.Sprintf("(%s=%s)", source.GroupMemberUID, ldap.EscapeFilter(uid))
}

result, err := l.Search(ldap.NewSearchRequest(
source.GroupDN,
groupDN,
ldap.ScopeWholeSubtree,
ldap.NeverDerefAliases,
0,
0,
false,
groupFilter,
searchFilter,
[]string{},
nil,
))
if err != nil {
log.Error("Failed group search using filter[%s]: %v", groupFilter, err)
log.Error("Failed group search in LDAP with filter [%s]: %v", searchFilter, err)
return ldapGroups
}

Expand All @@ -238,9 +255,7 @@ func (source *Source) mapLdapGroupsToTeams() map[string]map[string][]string {
}

// getMappedMemberships : returns the organizations and teams to modify the users membership
func (source *Source) getMappedMemberships(l *ldap.Conn, uid string) (map[string][]string, map[string][]string) {
// get all LDAP group memberships for user
usersLdapGroups := source.listLdapGroupMemberships(l, uid)
func (source *Source) getMappedMemberships(usersLdapGroups []string, uid string) (map[string][]string, map[string][]string) {
// unmarshall LDAP group team map from configs
ldapGroupsToTeams := source.mapLdapGroupsToTeams()
membershipsToAdd := map[string][]string{}
Expand All @@ -260,6 +275,14 @@ func (source *Source) getMappedMemberships(l *ldap.Conn, uid string) (map[string
return membershipsToAdd, membershipsToRemove
}

func (source *Source) getUserAttributeListedInGroup(entry *ldap.Entry) string {
if strings.ToLower(source.UserUID) == "dn" {
return entry.DN
}

return entry.GetAttributeValue(source.UserUID)
}

// SearchEntry : search an LDAP source if an entry (name, passwd) is valid and in the specific filter
func (source *Source) SearchEntry(name, passwd string, directBind bool) *SearchResult {
// See https://tools.ietf.org/search/rfc4513#section-5.1.2
Expand Down Expand Up @@ -375,58 +398,30 @@ func (source *Source) SearchEntry(name, passwd string, directBind bool) *SearchR
firstname := sr.Entries[0].GetAttributeValue(source.AttributeName)
surname := sr.Entries[0].GetAttributeValue(source.AttributeSurname)
mail := sr.Entries[0].GetAttributeValue(source.AttributeMail)
uid := sr.Entries[0].GetAttributeValue(source.UserUID)
if source.UserUID == "dn" || source.UserUID == "DN" {
uid = sr.Entries[0].DN
}

// Check group membership
if source.GroupsEnabled && source.GroupFilter != "" {
groupFilter, ok := source.sanitizedGroupFilter(source.GroupFilter)
if !ok {
return nil
}
groupDN, ok := source.sanitizedGroupDN(source.GroupDN)
if !ok {
return nil
}
teamsToAdd := make(map[string][]string)
teamsToRemove := make(map[string][]string)

log.Trace("Fetching groups '%v' with filter '%s' and base '%s'", source.GroupMemberUID, groupFilter, groupDN)
groupSearch := ldap.NewSearchRequest(
groupDN, ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false, groupFilter,
[]string{source.GroupMemberUID},
nil)
// Check group membership
if source.GroupsEnabled {
userAttributeListedInGroup := source.getUserAttributeListedInGroup(sr.Entries[0])
usersLdapGroups := source.listLdapGroupMemberships(l, userAttributeListedInGroup, true)

srg, err := l.Search(groupSearch)
if err != nil {
log.Error("LDAP group search failed: %v", err)
return nil
} else if len(srg.Entries) < 1 {
log.Error("LDAP group search failed: 0 entries")
if source.GroupFilter != "" && len(usersLdapGroups) == 0 {
return nil
}

isMember := false
Entries:
for _, group := range srg.Entries {
for _, member := range group.GetAttributeValues(source.GroupMemberUID) {
if (source.UserUID == "dn" && member == sr.Entries[0].DN) || member == uid {
isMember = true
break Entries
}
}
}

if !isMember {
log.Error("LDAP group membership test failed")
return nil
if source.GroupTeamMap != "" || source.GroupTeamMapRemoval {
teamsToAdd, teamsToRemove = source.getMappedMemberships(usersLdapGroups, userAttributeListedInGroup)
}
}

if isAttributeSSHPublicKeySet {
sshPublicKey = sr.Entries[0].GetAttributeValues(source.AttributeSSHPublicKey)
}

isAdmin := checkAdmin(l, source, userDN)

var isRestricted bool
if !isAdmin {
isRestricted = checkRestricted(l, source, userDN)
Expand All @@ -436,12 +431,6 @@ func (source *Source) SearchEntry(name, passwd string, directBind bool) *SearchR
Avatar = sr.Entries[0].GetRawAttributeValue(source.AttributeAvatar)
}

teamsToAdd := make(map[string][]string)
teamsToRemove := make(map[string][]string)
if source.GroupsEnabled && (source.GroupTeamMap != "" || source.GroupTeamMapRemoval) {
teamsToAdd, teamsToRemove = source.getMappedMemberships(l, uid)
}

if !directBind && source.AttributesInBind {
// binds user (checking password) after looking-up attributes in BindDN context
err = bindUser(l, userDN, passwd)
Expand Down Expand Up @@ -520,19 +509,29 @@ func (source *Source) SearchEntries() ([]*SearchResult, error) {
return nil, err
}

result := make([]*SearchResult, len(sr.Entries))
result := make([]*SearchResult, 0, len(sr.Entries))

for i, v := range sr.Entries {
for _, v := range sr.Entries {
teamsToAdd := make(map[string][]string)
teamsToRemove := make(map[string][]string)
if source.GroupsEnabled && (source.GroupTeamMap != "" || source.GroupTeamMapRemoval) {
userAttributeListedInGroup := v.GetAttributeValue(source.UserUID)
if source.UserUID == "dn" || source.UserUID == "DN" {
userAttributeListedInGroup = v.DN

if source.GroupsEnabled {
userAttributeListedInGroup := source.getUserAttributeListedInGroup(v)

if source.GroupFilter != "" {
usersLdapGroups := source.listLdapGroupMemberships(l, userAttributeListedInGroup, true)
if len(usersLdapGroups) == 0 {
continue
}
}

if source.GroupTeamMap != "" || source.GroupTeamMapRemoval {
usersLdapGroups := source.listLdapGroupMemberships(l, userAttributeListedInGroup, false)
teamsToAdd, teamsToRemove = source.getMappedMemberships(usersLdapGroups, userAttributeListedInGroup)
}
teamsToAdd, teamsToRemove = source.getMappedMemberships(l, userAttributeListedInGroup)
}
result[i] = &SearchResult{

user := &SearchResult{
Username: v.GetAttributeValue(source.AttributeUsername),
Name: v.GetAttributeValue(source.AttributeName),
Surname: v.GetAttributeValue(source.AttributeSurname),
Expand All @@ -541,16 +540,22 @@ func (source *Source) SearchEntries() ([]*SearchResult, error) {
LdapTeamAdd: teamsToAdd,
LdapTeamRemove: teamsToRemove,
}
if !result[i].IsAdmin {
result[i].IsRestricted = checkRestricted(l, source, v.DN)

if !user.IsAdmin {
user.IsRestricted = checkRestricted(l, source, v.DN)
}

if isAttributeSSHPublicKeySet {
result[i].SSHPublicKey = v.GetAttributeValues(source.AttributeSSHPublicKey)
user.SSHPublicKey = v.GetAttributeValues(source.AttributeSSHPublicKey)
}

if isAtributeAvatarSet {
result[i].Avatar = v.GetRawAttributeValue(source.AttributeAvatar)
user.Avatar = v.GetRawAttributeValue(source.AttributeAvatar)
}
result[i].LowerName = strings.ToLower(result[i].Username)

user.LowerName = strings.ToLower(user.Username)

result = append(result, user)
}

return result, nil
Expand Down
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