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Fix group filter for ldap source sync #22506

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merged 3 commits into from
Feb 2, 2023
Merged

Fix group filter for ldap source sync #22506

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84db9f7
Fix group filter for ldap source sync
pezhovski Jan 18, 2023
befa670
Merge branch 'main' into apply-groupfilter-for-ldap-user-sync
lunny Feb 2, 2023
231699a
Merge branch 'main' into apply-groupfilter-for-ldap-user-sync
lunny Feb 2, 2023
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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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