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Better DN suffix validation

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This commit is contained in:
Alex 2020-01-19 19:19:34 +01:00
parent b238a6eb0e
commit 5ae18daff7
1 changed files with 32 additions and 17 deletions
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49
main.go
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@ -262,6 +262,23 @@ func (server *Server) objectExists(dn string) (bool, error) {
return len(data) > 0, nil
}
func (server *Server) checkSuffix(dn string, allow_extend bool) (string, error) {
suffix := server.config.Suffix
if len(dn) < len(suffix) {
if dn != suffix[-len(dn):] || !allow_extend {
return suffix, fmt.Errorf(
"Only handling stuff under DN %s", suffix)
}
return suffix, nil
} else {
if dn[len(dn)-len(suffix):] != suffix {
return suffix, fmt.Errorf(
"Only handling stuff under DN %s", suffix)
}
return dn, nil
}
}
func (server *Server) handleBind(s ldap.UserState, w ldap.ResponseWriter, m *ldap.Message) {
state := s.(*State)
r := m.GetBindRequest()
@ -320,25 +337,14 @@ func (server *Server) handleSearchInternal(state *State, w ldap.ResponseWriter,
log.Printf("Request TimeLimit=%d", r.TimeLimit().Int())
// TODO check authorizations
baseObject := dnToConsul(string(r.BaseObject()))
minimalBaseObject := dnToConsul(server.config.Suffix)
if len(baseObject) <= len(minimalBaseObject) {
if baseObject != minimalBaseObject[:len(baseObject)] {
return ldap.LDAPResultInvalidDNSyntax, fmt.Errorf(
"Only handling search results under DN=%s",
server.config.Suffix)
}
baseObject = minimalBaseObject
} else {
if baseObject[:len(minimalBaseObject)] != minimalBaseObject {
return ldap.LDAPResultInvalidDNSyntax, fmt.Errorf(
"Only handling search results under DN=%s",
server.config.Suffix)
}
baseObject, err := server.checkSuffix(string(r.BaseObject()), true)
if err != nil {
return ldap.LDAPResultInvalidDNSyntax, err
}
basePath := dnToConsul(baseObject) + "/"
data, _, err := server.kv.List(baseObject + "/", nil)
data, _, err := server.kv.List(basePath, nil)
if err != nil {
return ldap.LDAPResultOperationsError, err
}
@ -347,7 +353,7 @@ func (server *Server) handleSearchInternal(state *State, w ldap.ResponseWriter,
if err != nil {
return ldap.LDAPResultOperationsError, err
}
log.Printf("in %s: %#v", baseObject + "/", data)
log.Printf("in %s: %#v", basePath, data)
log.Printf("%#v", entries)
for dn, entry := range entries {
@ -461,6 +467,11 @@ func (server *Server) handleAdd(s ldap.UserState, w ldap.ResponseWriter, m *ldap
func (server *Server) handleAddInternal(state *State, r *message.AddRequest) (int, error) {
dn := string(r.Entry())
_, err := server.checkSuffix(dn, false)
if err != nil {
return ldap.LDAPResultInvalidDNSyntax, err
}
exists, err := server.objectExists(dn)
if err != nil {
return ldap.LDAPResultOperationsError, err
@ -486,6 +497,10 @@ func (server *Server) handleAddInternal(state *State, r *message.AddRequest) (in
if strings.EqualFold(key, "member") {
members = vals_str
for _, member := range members {
_, err := server.checkSuffix(member, false)
if err != nil {
return ldap.LDAPResultInvalidDNSyntax, err
}
exists, err = server.objectExists(member)
if err != nil {
return ldap.LDAPResultOperationsError, err