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BED-5036 implement post processing for CoerceAndRelayNTLMToSMB
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| // Copyright 2024 Specter Ops, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // SPDX-License-Identifier: Apache-2.0 | ||
|
|
||
| package ad | ||
|
|
||
| import ( | ||
| "context" | ||
| "errors" | ||
|
|
||
| "github.com/specterops/bloodhound/analysis" | ||
| "github.com/specterops/bloodhound/analysis/impact" | ||
| "github.com/specterops/bloodhound/dawgs/cardinality" | ||
| "github.com/specterops/bloodhound/dawgs/graph" | ||
| "github.com/specterops/bloodhound/dawgs/ops" | ||
| "github.com/specterops/bloodhound/dawgs/query" | ||
| "github.com/specterops/bloodhound/graphschema/ad" | ||
| "github.com/specterops/bloodhound/graphschema/common" | ||
| "github.com/specterops/bloodhound/log" | ||
| ) | ||
|
|
||
| // PostNTLM is the initial function used to execute our NTLM analysis | ||
| func PostNTLM(ctx context.Context, db graph.Database, groupExpansions impact.PathAggregator) (*analysis.AtomicPostProcessingStats, error) { | ||
| operation := analysis.NewPostRelationshipOperation(ctx, db, "PostNTLM") | ||
|
|
||
| // TODO: after adding all of our new NTLM edges, benchmark performance between submitting multiple readers per computer or single reader per computer | ||
| err := db.ReadTransaction(ctx, func(tx graph.Transaction) error { | ||
|
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| authenticatedUsersCache := make(map[string]graph.ID) | ||
|
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| // Fetch all nodes where the node is a Group and is an Authenticated User | ||
| if err := tx.Nodes().Filter( | ||
| query.And( | ||
| query.Kind(query.Node(), ad.Group), | ||
| query.StringEndsWith(query.NodeProperty(common.ObjectID.String()), AuthenticatedUsersSuffix)), | ||
| ).Fetch(func(cursor graph.Cursor[*graph.Node]) error { | ||
| for authenticatedUser := range cursor.Chan() { | ||
| if domain, err := authenticatedUser.Properties.Get(ad.Domain.String()).String(); err != nil { | ||
| continue | ||
| } else { | ||
| authenticatedUsersCache[domain] = authenticatedUser.ID | ||
| } | ||
| } | ||
|
|
||
| return cursor.Error() | ||
| }, | ||
| ); err != nil { | ||
| return err | ||
| } else { | ||
| // Fetch all nodes where the type is Computer | ||
| return tx.Nodes().Filter(query.Kind(query.Node(), ad.Computer)).Fetch(func(cursor graph.Cursor[*graph.Node]) error { | ||
| for computer := range cursor.Chan() { | ||
| innerComputer := computer | ||
|
|
||
| if domain, err := innerComputer.Properties.Get(ad.Domain.String()).String(); err != nil { | ||
| continue | ||
| } else { | ||
| if err := operation.Operation.SubmitReader(func(ctx context.Context, tx graph.Transaction, outC chan<- analysis.CreatePostRelationshipJob) error { | ||
| return PostCoerceAndRelayNtlmToSmb(tx, outC, groupExpansions, innerComputer, domain, authenticatedUsersCache) | ||
| }); err != nil { | ||
| log.Warnf("Post processing failed for %s: %v", ad.CoerceAndRelayNTLMToSMB, err) | ||
| // Additional analysis may occur if one of our analysis errors | ||
| continue | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return cursor.Error() | ||
| }) | ||
| } | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &operation.Stats, operation.Done() | ||
| } | ||
|
|
||
| // PostCoerceAndRelayNtlmToSmb creates edges that allow a computer with unrolled admin access to one or more computers where SMB signing is disabled. | ||
| // Comprised solely oof adminTo and memberOf edges | ||
| func PostCoerceAndRelayNtlmToSmb(tx graph.Transaction, outC chan<- analysis.CreatePostRelationshipJob, expandedGroups impact.PathAggregator, computer *graph.Node, domain string, authenticaedUserNodes map[string]graph.ID) error { | ||
| if authenticatedUserID, ok := authenticaedUserNodes[domain]; !ok { | ||
| return nil | ||
| } else if smbSigningEnabled, err := computer.Properties.Get(ad.SmbSigning.String()).Bool(); err != nil { | ||
| if errors.Is(err, graph.ErrPropertyNotFound) { | ||
| return nil | ||
| } else { | ||
| return err | ||
| } | ||
| } else if !smbSigningEnabled { | ||
|
|
||
| // Fetch the admins with edges to the provided computer | ||
| if firstDegreeAdmins, err := fetchFirstDegreeNodes(tx, computer, ad.AdminTo); err != nil { | ||
| return err | ||
| } else { | ||
| if firstDegreeAdmins.ContainingNodeKinds(ad.Computer).Len() > 0 { | ||
| outC <- analysis.CreatePostRelationshipJob{ | ||
| FromID: authenticatedUserID, | ||
| ToID: computer.ID, | ||
| Kind: ad.CoerceAndRelayNTLMToSMB, | ||
| } | ||
| } else { | ||
| allAdmins := cardinality.NewBitmap64() | ||
| for group := range firstDegreeAdmins.ContainingNodeKinds(ad.Group) { | ||
| allAdmins.And(expandedGroups.Cardinality(group.Uint64())) | ||
| } | ||
|
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| // Fetch nodes where the node id is in our allAdmins bitmap and are of type Computer | ||
| if computerIds, err := ops.FetchNodeIDs(tx.Nodes().Filter( | ||
| query.And( | ||
| query.InIDs(query.Node(), graph.DuplexToGraphIDs(allAdmins)...), | ||
| query.Kind(query.Node(), ad.Computer), | ||
| ), | ||
| )); err != nil { | ||
| return err | ||
| } else if len(computerIds) > 0 { | ||
| outC <- analysis.CreatePostRelationshipJob{ | ||
| FromID: authenticatedUserID, | ||
| ToID: computer.ID, | ||
| Kind: ad.CoerceAndRelayNTLMToSMB, | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return nil | ||
| } |
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