outposts/ldap: Fix more case sensitivity issues. (#2144)

internal/outpost/ldap/utils/utils.go

@@ -2,6 +2,7 @@ package utils
 
 import (
 	"reflect"
+	"strings"
 
 	"github.com/nmcclain/ldap"
 	log "github.com/sirupsen/logrus"
@@ -117,3 +118,7 @@ func GetContainerEntry(filterOC string, dn string, ou string) *ldap.Entry {
 
 	return nil
 }
+
+func HasSuffixNoCase(s1 string, s2 string) bool {
+	return strings.HasSuffix(strings.ToLower(s1), strings.ToLower(s2))
+}

internal/outpost/ldap/utils/utils_group.go

@@ -1,6 +1,8 @@
 package utils
 
 import (
+	"strings"
+
 	goldap "github.com/go-ldap/ldap/v3"
 	ber "github.com/nmcclain/asn1-ber"
 	"github.com/nmcclain/ldap"
@@ -41,7 +43,7 @@ func parseFilterForGroupSingle(req api.ApiCoreGroupsListRequest, f *ber.Packet)
 	// Switch on type of the value, then check the key
 	switch vv := v.(type) {
 	case string:
-		switch k {
+		switch strings.ToLower(k.(string)) {
 		case "cn":
 			return req.Name(vv), false
 		case "member":
@@ -54,7 +56,7 @@ func parseFilterForGroupSingle(req api.ApiCoreGroupsListRequest, f *ber.Packet)
 			username := userDN.RDNs[0].Attributes[0].Value
 			// If the DN's first ou is virtual-groups, ignore this filter
 			if len(userDN.RDNs) > 1 {
-				if userDN.RDNs[1].Attributes[0].Value == constants.OUVirtualGroups || userDN.RDNs[1].Attributes[0].Value == constants.OUGroups {
+				if strings.EqualFold(userDN.RDNs[1].Attributes[0].Value, constants.OUVirtualGroups) || strings.EqualFold(userDN.RDNs[1].Attributes[0].Value, constants.OUGroups) {
 					// Since we know we're not filtering anything, skip this request
 					return req, true
 				}