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Fix duplicate ecs mappings which returns incorrect log index field in…
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… mapping view API (#786) (#788)

* field mapping changes

Signed-off-by: Joanne Wang <jowg@amazon.com>

* add integ test

Signed-off-by: Joanne Wang <jowg@amazon.com>

* turn unmappedfieldaliases as set and add integ test

Signed-off-by: Joanne Wang <jowg@amazon.com>

* add comments

Signed-off-by: Joanne Wang <jowg@amazon.com>

* fix integ tests

Signed-off-by: Joanne Wang <jowg@amazon.com>

* moved logic to method for better readability

Signed-off-by: Joanne Wang <jowg@amazon.com>

---------

Signed-off-by: Joanne Wang <jowg@amazon.com>
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jowg-amazon authored Mar 7, 2024
1 parent 8877390 commit 689760e
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48 changes: 39 additions & 9 deletions src/main/java/org/opensearch/securityanalytics/mapper/MapperService.java
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@
import org.apache.commons.lang3.tuple.Pair;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.opensearch.OpenSearchStatusException;
import org.opensearch.action.admin.indices.get.GetIndexRequest;
import org.opensearch.action.admin.indices.get.GetIndexResponse;
import org.opensearch.action.admin.indices.mapping.get.GetMappingsRequest;
Expand Down Expand Up @@ -485,13 +484,16 @@ public void onResponse(GetMappingsResponse getMappingsResponse) {
String rawPath = requiredField.getRawField();
String ocsfPath = requiredField.getOcsf();
if (allFieldsFromIndex.contains(rawPath)) {
if (alias != null) {
// Maintain list of found paths in index
applyableAliases.add(alias);
} else {
applyableAliases.add(rawPath);
// if the alias was already added into applyable aliases, then skip to avoid duplicates
if (!applyableAliases.contains(alias) && !applyableAliases.contains(rawPath)) {
if (alias != null) {
// Maintain list of found paths in index
applyableAliases.add(alias);
} else {
applyableAliases.add(rawPath);
}
pathsOfApplyableAliases.add(rawPath);
}
pathsOfApplyableAliases.add(rawPath);
} else if (allFieldsFromIndex.contains(ocsfPath)) {
applyableAliases.add(alias);
pathsOfApplyableAliases.add(ocsfPath);
Expand All @@ -505,13 +507,21 @@ public void onResponse(GetMappingsResponse getMappingsResponse) {
}
}

// turn unmappedFieldAliases into a set to remove duplicates
Set<String> setOfUnmappedFieldAliases = new HashSet<>(unmappedFieldAliases);

// filter out aliases that were included in applyableAliases already
List<String> filteredUnmappedFieldAliases = setOfUnmappedFieldAliases.stream()
.filter(e -> false == applyableAliases.contains(e))
.collect(Collectors.toList());

Map<String, Map<String, String>> aliasMappingFields = new HashMap<>();
XContentBuilder aliasMappingsObj = XContentFactory.jsonBuilder().startObject();
for (LogType.Mapping mapping : requiredFields) {
if (allFieldsFromIndex.contains(mapping.getOcsf())) {
aliasMappingFields.put(mapping.getEcs(), Map.of("type", "alias", "path", mapping.getOcsf()));
} else if (mapping.getEcs() != null) {
aliasMappingFields.put(mapping.getEcs(), Map.of("type", "alias", "path", mapping.getRawField()));
shouldUpdateEcsMappingAndMaybeUpdates(mapping, aliasMappingFields, pathsOfApplyableAliases);
} else if (mapping.getEcs() == null) {
aliasMappingFields.put(mapping.getRawField(), Map.of("type", "alias", "path", mapping.getRawField()));
}
Expand All @@ -527,7 +537,7 @@ public void onResponse(GetMappingsResponse getMappingsResponse) {
.filter(e -> pathsOfApplyableAliases.contains(e) == false)
.collect(Collectors.toList());
actionListener.onResponse(
new GetMappingsViewResponse(aliasMappings, unmappedIndexFields, unmappedFieldAliases, logTypeService.getIocFieldsList(logType))
new GetMappingsViewResponse(aliasMappings, unmappedIndexFields, filteredUnmappedFieldAliases, logTypeService.getIocFieldsList(logType))
);
} catch (Exception e) {
actionListener.onFailure(e);
Expand All @@ -542,6 +552,26 @@ public void onFailure(Exception e) {
});
}

/**
* Only updates the alias mapping fields if the ecs key has not been mapped yet
* or if pathOfApplyableAliases contains the raw field
*
* @param mapping
* @param aliasMappingFields
* @param pathsOfApplyableAliases
*/
private static void shouldUpdateEcsMappingAndMaybeUpdates(LogType.Mapping mapping, Map<String, Map<String, String>> aliasMappingFields, List<String> pathsOfApplyableAliases) {
// check if aliasMappingFields already contains a key
if (aliasMappingFields.containsKey(mapping.getEcs())) {
// if the pathOfApplyableAliases contains the raw field, then override the existing map
if (pathsOfApplyableAliases.contains(mapping.getRawField())) {
aliasMappingFields.put(mapping.getEcs(), Map.of("type", "alias", "path", mapping.getRawField()));
}
} else {
aliasMappingFields.put(mapping.getEcs(), Map.of("type", "alias", "path", mapping.getRawField()));
}
}

/**
* Given index name, resolves it to single concrete index, depending on what initial <code>indexName</code> is.
* In case of Datastream or Alias, WriteIndex would be returned. In case of index pattern, newest index by creation date would be returned.
Expand Down
171 changes: 171 additions & 0 deletions src/test/java/org/opensearch/securityanalytics/mapper/MapperRestApiIT.java
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Original file line number Diff line number Diff line change
Expand Up @@ -395,6 +395,114 @@ public void testGetMappingsViewLinuxSuccess() throws IOException {
assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
}

// Tests mappings where multiple raw fields correspond to one ecs value
public void testGetMappingsViewWindowsSuccess() throws IOException {

String testIndexName = "get_mappings_view_index";

createSampleWindex(testIndexName);

// Execute GetMappingsViewAction to add alias mapping for index
Request request = new Request("GET", SecurityAnalyticsPlugin.MAPPINGS_VIEW_BASE_URI);
// both req params and req body are supported
request.addParameter("index_name", testIndexName);
request.addParameter("rule_topic", "windows");
Response response = client().performRequest(request);
assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
Map<String, Object> respMap = responseAsMap(response);

// Verify alias mappings
Map<String, Object> props = (Map<String, Object>) respMap.get("properties");
assertEquals(3, props.size());
assertTrue(props.containsKey("winlog.event_data.LogonType"));
assertTrue(props.containsKey("winlog.provider_name"));
assertTrue(props.containsKey("host.hostname"));

// Verify unmapped index fields
List<String> unmappedIndexFields = (List<String>) respMap.get("unmapped_index_fields");
assertEquals(3, unmappedIndexFields.size());
assert(unmappedIndexFields.contains("plain1"));
assert(unmappedIndexFields.contains("ParentUser.first"));
assert(unmappedIndexFields.contains("ParentUser.last"));

// Verify unmapped field aliases
List<String> filteredUnmappedFieldAliases = (List<String>) respMap.get("unmapped_field_aliases");
assertEquals(191, filteredUnmappedFieldAliases.size());
assert(!filteredUnmappedFieldAliases.contains("winlog.event_data.LogonType"));
assert(!filteredUnmappedFieldAliases.contains("winlog.provider_name"));
assert(!filteredUnmappedFieldAliases.contains("host.hostname"));
List<HashMap<String, Object>> iocFieldsList = (List<HashMap<String, Object>>) respMap.get(GetMappingsViewResponse.THREAT_INTEL_FIELD_ALIASES);
assertEquals(iocFieldsList.size(), 1);

// Index a doc for a field with multiple raw fields corresponding to one ecs field
indexDoc(testIndexName, "1", "{ \"EventID\": 1 }");
// Execute GetMappingsViewAction to add alias mapping for index
request = new Request("GET", SecurityAnalyticsPlugin.MAPPINGS_VIEW_BASE_URI);
// both req params and req body are supported
request.addParameter("index_name", testIndexName);
request.addParameter("rule_topic", "windows");
response = client().performRequest(request);
assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
respMap = responseAsMap(response);

// Verify alias mappings
props = (Map<String, Object>) respMap.get("properties");
assertEquals(4, props.size());
assertTrue(props.containsKey("winlog.event_id"));

// verify unmapped index fields
unmappedIndexFields = (List<String>) respMap.get("unmapped_index_fields");
assertEquals(3, unmappedIndexFields.size());

// verify unmapped field aliases
filteredUnmappedFieldAliases = (List<String>) respMap.get("unmapped_field_aliases");
assertEquals(190, filteredUnmappedFieldAliases.size());
assert(!filteredUnmappedFieldAliases.contains("winlog.event_id"));
}

// Tests mappings where multiple raw fields correspond to one ecs value and all fields are present in the index
public void testGetMappingsViewMulitpleRawFieldsSuccess() throws IOException {

String testIndexName = "get_mappings_view_index";

createSampleWindex(testIndexName);
String sampleDoc = "{" +
" \"EventID\": 1," +
" \"EventId\": 2," +
" \"event_uid\": 3" +
"}";
indexDoc(testIndexName, "1", sampleDoc);

// Execute GetMappingsViewAction to add alias mapping for index
Request request = new Request("GET", SecurityAnalyticsPlugin.MAPPINGS_VIEW_BASE_URI);
// both req params and req body are supported
request.addParameter("index_name", testIndexName);
request.addParameter("rule_topic", "windows");
Response response = client().performRequest(request);
assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
Map<String, Object> respMap = responseAsMap(response);

// Verify alias mappings
Map<String, Object> props = (Map<String, Object>) respMap.get("properties");
assertEquals(4, props.size());
assertTrue(props.containsKey("winlog.event_data.LogonType"));
assertTrue(props.containsKey("winlog.provider_name"));
assertTrue(props.containsKey("host.hostname"));
assertTrue(props.containsKey("winlog.event_id"));

// Verify unmapped index fields
List<String> unmappedIndexFields = (List<String>) respMap.get("unmapped_index_fields");
assertEquals(5, unmappedIndexFields.size());

// Verify unmapped field aliases
List<String> filteredUnmappedFieldAliases = (List<String>) respMap.get("unmapped_field_aliases");
assertEquals(190, filteredUnmappedFieldAliases.size());
assert(!filteredUnmappedFieldAliases.contains("winlog.event_data.LogonType"));
assert(!filteredUnmappedFieldAliases.contains("winlog.provider_name"));
assert(!filteredUnmappedFieldAliases.contains("host.hostname"));
assert(!filteredUnmappedFieldAliases.contains("winlog.event_id"));
}

public void testCreateMappings_withDatastream_success() throws IOException {
String datastream = "test_datastream";

Expand Down Expand Up @@ -1278,6 +1386,69 @@ private void createSampleIndex(String indexName, Settings settings, String alias
assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
}

private void createSampleWindex(String indexName) throws IOException {
createSampleWindex(indexName, Settings.EMPTY, null);
}

private void createSampleWindex(String indexName, Settings settings, String aliases) throws IOException {
String indexMapping =
" \"properties\": {" +
" \"LogonType\": {" +
" \"type\": \"integer\"" +
" }," +
" \"Provider\": {" +
" \"type\": \"text\"" +
" }," +
" \"hostname\": {" +
" \"type\": \"text\"" +
" }," +
" \"plain1\": {" +
" \"type\": \"integer\"" +
" }," +
" \"ParentUser\":{" +
" \"type\":\"nested\"," +
" \"properties\":{" +
" \"first\":{" +
" \"type\":\"text\"," +
" \"fields\":{" +
" \"keyword\":{" +
" \"type\":\"keyword\"," +
" \"ignore_above\":256" +
"}" +
"}" +
"}," +
" \"last\":{" +
"\"type\":\"text\"," +
"\"fields\":{" +
" \"keyword\":{" +
" \"type\":\"keyword\"," +
" \"ignore_above\":256" +
"}" +
"}" +
"}" +
"}" +
"}" +
" }";

createIndex(indexName, settings, indexMapping, aliases);

// Insert sample doc with event_uid not explicitly mapped
String sampleDoc = "{" +
" \"LogonType\":1," +
" \"Provider\":\"Microsoft-Windows-Security-Auditing\"," +
" \"hostname\":\"FLUXCAPACITOR\"" +
"}";

// Index doc
Request indexRequest = new Request("POST", indexName + "/_doc?refresh=wait_for");
indexRequest.setJsonEntity(sampleDoc);
Response response = client().performRequest(indexRequest);
assertEquals(HttpStatus.SC_CREATED, response.getStatusLine().getStatusCode());
// Refresh everything
response = client().performRequest(new Request("POST", "_refresh"));
assertEquals(HttpStatus.SC_OK, response.getStatusLine().getStatusCode());
}

private void createSampleDatastream(String datastreamName) throws IOException {
String indexMapping =
" \"properties\": {" +
Expand Down
4 changes: 2 additions & 2 deletions src/test/java/org/opensearch/securityanalytics/resthandler/OCSFDetectorRestApiIT.java
View file
Original file line number Diff line number Diff line change
Expand Up @@ -436,7 +436,7 @@ public void testOCSFCloudtrailGetMappingsViewApi() throws IOException {
assertEquals(20, unmappedIndexFields.size());
// Verify unmapped field aliases
List<String> unmappedFieldAliases = (List<String>) respMap.get("unmapped_field_aliases");
assertEquals(25, unmappedFieldAliases.size());
assertEquals(24, unmappedFieldAliases.size());
}

@SuppressWarnings("unchecked")
Expand Down Expand Up @@ -502,7 +502,7 @@ public void testRawCloudtrailGetMappingsViewApi() throws IOException {
assertEquals(17, unmappedIndexFields.size());
// Verify unmapped field aliases
List<String> unmappedFieldAliases = (List<String>) respMap.get("unmapped_field_aliases");
assertEquals(26, unmappedFieldAliases.size());
assertEquals(25, unmappedFieldAliases.size());
}

@SuppressWarnings("unchecked")
Expand Down

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