[PM-9423] observable user encryptor

libs/common/src/tools/state/secret-state.spec.ts

@@ -1,5 +1,5 @@
 import { mock } from "jest-mock-extended";
-import { firstValueFrom, from } from "rxjs";
+import { BehaviorSubject, firstValueFrom, from, Observable } from "rxjs";
 import { Jsonify } from "type-fest";
 
 import {
@@ -36,20 +36,20 @@ const FOOBAR_RECORD = SecretKeyDefinition.record(GENERATOR_DISK, "fooBar", class
 
 const SomeUser = "some user" as UserId;
 
-function mockEncryptor<T>(fooBar: T[] = []): UserEncryptor {
+function mockEncryptor<T>(fooBar: T[] = []): Observable<UserEncryptor> {
   // stores "encrypted values" so that they can be "decrypted" later
   // while allowing the operations to be interleaved.
   const encrypted = new Map<string, Jsonify<FooBar>>(
     fooBar.map((fb) => [toKey(fb as any).encryptedString, toValue(fb)] as const),
   );
 
-  const result = mock<UserEncryptor>({
-    encrypt<T>(value: Jsonify<T>, user: UserId) {
+  const result: UserEncryptor = mock<UserEncryptor>({
+    encrypt<T>(value: Jsonify<T>) {
       const encString = toKey(value as any);
       encrypted.set(encString.encryptedString, toValue(value));
       return Promise.resolve(encString);
     },
-    decrypt(secret: EncString, userId: UserId) {
+    decrypt(secret: EncString) {
       const decValue = encrypted.get(secret.encryptedString);
       return Promise.resolve(decValue as any);
     },
@@ -66,9 +66,9 @@ function mockEncryptor<T>(fooBar: T[] = []): UserEncryptor {
     return JSON.parse(JSON.stringify(value));
   }
 
-  // typescript pops a false positive about missing `encrypt` and `decrypt`
-  // functions, so assert the type manually.
-  return result as unknown as UserEncryptor;
+  // wrap in a behavior subject to ensure a value is always available
+  const encryptor$ = new BehaviorSubject(result).asObservable();
+  return encryptor$;
 }
 
 async function fakeStateProvider() {

libs/common/src/tools/state/secret-state.ts

@@ -1,4 +1,4 @@
-import { Observable, map, concatMap, share, ReplaySubject, timer } from "rxjs";
+import { Observable, map, concatMap, share, ReplaySubject, timer, combineLatest, of } from "rxjs";
 
 import { EncString } from "../../platform/models/domain/enc-string";
 import {
@@ -30,17 +30,18 @@ export class SecretState<Outer, Id, Plaintext extends object, Disclosed, Secret>
   // wiring the derived and secret states together.
   private constructor(
     private readonly key: SecretKeyDefinition<Outer, Id, Plaintext, Disclosed, Secret>,
-    private readonly encryptor: UserEncryptor,
+    private readonly $encryptor: Observable<UserEncryptor>,
     userId: UserId,
     provider: StateProvider,
   ) {
     // construct the backing store
     this.encryptedState = provider.getUser(userId, key.toEncryptedStateKey());
 
     // cache plaintext
-    this.combinedState$ = this.encryptedState.combinedState$.pipe(
+    this.combinedState$ = combineLatest([this.encryptedState.combinedState$, this.$encryptor]).pipe(
       concatMap(
-        async ([userId, state]) => [userId, await this.declassifyAll(state)] as [UserId, Outer],
+        async ([[userId, state], encryptor]) =>
+          [userId, await this.declassifyAll(encryptor, state)] as [UserId, Outer],
       ),
       share({
         connector: () => {
@@ -85,30 +86,33 @@ export class SecretState<Outer, Id, Plaintext extends object, Disclosed, Secret>
     userId: UserId,
     key: SecretKeyDefinition<Outer, Id, TFrom, Disclosed, Secret>,
     provider: StateProvider,
-    encryptor: UserEncryptor,
+    encryptor$: Observable<UserEncryptor>,
   ) {
-    const secretState = new SecretState(key, encryptor, userId, provider);
+    const secretState = new SecretState(key, encryptor$, userId, provider);
     return secretState;
   }
 
-  private async declassifyItem({ id, secret, disclosed }: ClassifiedFormat<Id, Disclosed>) {
+  private async declassifyItem(
+    encryptor: UserEncryptor,
+    { id, secret, disclosed }: ClassifiedFormat<Id, Disclosed>,
+  ) {
     const encrypted = EncString.fromJSON(secret);
-    const decrypted = await this.encryptor.decrypt(encrypted, this.encryptedState.userId);
+    const decrypted = await encryptor.decrypt(encrypted);
 
     const declassified = this.key.classifier.declassify(disclosed, decrypted);
     const result = [id, this.key.options.deserializer(declassified)] as const;
 
     return result;
   }
 
-  private async declassifyAll(data: ClassifiedFormat<Id, Disclosed>[]) {
+  private async declassifyAll(encryptor: UserEncryptor, data: ClassifiedFormat<Id, Disclosed>[]) {
     // fail fast if there's no value
     if (data === null || data === undefined) {
       return null;
     }
 
     // decrypt each item
-    const decryptTasks = data.map(async (item) => this.declassifyItem(item));
+    const decryptTasks = data.map(async (item) => this.declassifyItem(encryptor, item));
 
     // reconstruct expected type
     const results = await Promise.all(decryptTasks);
@@ -117,9 +121,9 @@ export class SecretState<Outer, Id, Plaintext extends object, Disclosed, Secret>
     return result;
   }
 
-  private async classifyItem([id, item]: [Id, Plaintext]) {
+  private async classifyItem(encryptor: UserEncryptor, [id, item]: [Id, Plaintext]) {
     const classified = this.key.classifier.classify(item);
-    const encrypted = await this.encryptor.encrypt(classified.secret, this.encryptedState.userId);
+    const encrypted = await encryptor.encrypt(classified.secret);
 
     // the deserializer in the plaintextState's `derive` configuration always runs, but
     // `encryptedState` is not guaranteed to serialize the data, so it's necessary to
@@ -133,7 +137,7 @@ export class SecretState<Outer, Id, Plaintext extends object, Disclosed, Secret>
     return serialized;
   }
 
-  private async classifyAll(data: Outer) {
+  private async classifyAll(encryptor: UserEncryptor, data: Outer) {
     // fail fast if there's no value
     if (data === null || data === undefined) {
       return null;
@@ -144,7 +148,7 @@ export class SecretState<Outer, Id, Plaintext extends object, Disclosed, Secret>
     const desconstructed = this.key.deconstruct(data);
 
     // encrypt each value individually
-    const classifyTasks = desconstructed.map(async (item) => this.classifyItem(item));
+    const classifyTasks = desconstructed.map(async (item) => this.classifyItem(encryptor, item));
     const classified = await Promise.all(classifyTasks);
 
     return classified;
@@ -167,28 +171,34 @@ export class SecretState<Outer, Id, Plaintext extends object, Disclosed, Secret>
     configureState: (state: Outer, dependencies: TCombine) => Outer,
     options: StateUpdateOptions<Outer, TCombine> = null,
   ): Promise<Outer> {
+    const combineLatestWith = combineLatest([
+      options?.combineLatestWith ?? of(null),
+      this.$encryptor,
+    ]);
+
     // read the backing store
     let latestClassified: ClassifiedFormat<Id, Disclosed>[];
     let latestCombined: TCombine;
+    let latestEncryptor: UserEncryptor;
     await this.encryptedState.update((c) => c, {
       shouldUpdate: (latest, combined) => {
         latestClassified = latest;
-        latestCombined = combined;
+        [latestCombined, latestEncryptor] = combined;
         return false;
       },
-      combineLatestWith: options?.combineLatestWith,
+      combineLatestWith,
     });
 
     // exit early if there's no update to apply
-    const latestDeclassified = await this.declassifyAll(latestClassified);
+    const latestDeclassified = await this.declassifyAll(latestEncryptor, latestClassified);
     const shouldUpdate = options?.shouldUpdate?.(latestDeclassified, latestCombined) ?? true;
     if (!shouldUpdate) {
       return latestDeclassified;
     }
 
     // apply the update
     const updatedDeclassified = configureState(latestDeclassified, latestCombined);
-    const updatedClassified = await this.classifyAll(updatedDeclassified);
+    const updatedClassified = await this.classifyAll(latestEncryptor, updatedDeclassified);
     await this.encryptedState.update(() => updatedClassified);
 
     return updatedDeclassified;

libs/common/src/tools/state/user-encryptor.abstraction.ts

@@ -1,34 +1,33 @@
 import { Jsonify } from "type-fest";
 
+import { UserId } from "@bitwarden/common/types/guid";
+
 import { EncString } from "../../platform/models/domain/enc-string";
-import { UserId } from "../../types/guid";
 
-/** A classification strategy that protects a type's secrets with
- *  user-specific information. The specific kind of information is
- *  determined by the classification strategy.
+/** An encryption strategy that protects a type's secrets with
+ *  user-specific keys. This strategy is bound to a specific user.
  */
 export abstract class UserEncryptor {
+  /** Identifies the user bound to the encryptor. */
+  readonly userId: UserId;
+
   /** Protects secrets in `value` with a user-specific key.
    *  @param secret the object to protect. This object is mutated during encryption.
-   *  @param userId identifies the user-specific information used to protect
-   *    the secret.
    *  @returns a promise that resolves to a tuple. The tuple's first property contains
    *    the encrypted secret and whose second property contains an object w/ disclosed
    *    properties.
    *   @throws If `value` is `null` or `undefined`, the promise rejects with an error.
    */
-  abstract encrypt<Secret>(secret: Jsonify<Secret>, userId: UserId): Promise<EncString>;
+  abstract encrypt<Secret>(secret: Jsonify<Secret>): Promise<EncString>;
 
   /** Combines protected secrets and disclosed data into a type that can be
    *  rehydrated into a domain object.
    *  @param secret an encrypted JSON payload containing encrypted secrets.
-   *  @param userId identifies the user-specific information used to protect
-   *    the secret.
    *  @returns a promise that resolves to the raw state. This state *is not* a
    *    class. It contains only data that can be round-tripped through JSON,
    *    and lacks members such as a prototype or bound functions.
    *  @throws If `secret` or `disclosed` is `null` or `undefined`, the promise
    *    rejects with an error.
    */
-  abstract decrypt<Secret>(secret: EncString, userId: UserId): Promise<Jsonify<Secret>>;
+  abstract decrypt<Secret>(secret: EncString): Promise<Jsonify<Secret>>;
 }

libs/common/src/tools/state/user-key-encryptor.spec.ts

@@ -1,6 +1,5 @@
 import { mock } from "jest-mock-extended";
 
-import { CryptoService } from "../../platform/abstractions/crypto.service";
 import { EncryptService } from "../../platform/abstractions/encrypt.service";
 import { EncString } from "../../platform/models/domain/enc-string";
 import { SymmetricCryptoKey } from "../../platform/models/domain/symmetric-crypto-key";
@@ -13,7 +12,6 @@ import { UserKeyEncryptor } from "./user-key-encryptor";
 
 describe("UserKeyEncryptor", () => {
   const encryptService = mock<EncryptService>();
-  const keyService = mock<CryptoService>();
   const dataPacker = mock<DataPacker>();
   const userKey = new SymmetricCryptoKey(new Uint8Array(64) as CsprngArray) as UserKey;
   const anyUserId = "foo" as UserId;
@@ -23,10 +21,9 @@ describe("UserKeyEncryptor", () => {
     // objects, so its tests focus on how data flows between components. The defaults rely
     // on this property--that the facade treats its data like a opaque objects--to trace
     // the data through several function calls. Should the encryptor interact with the
-    // objects themselves, it will break.
+    // objects themselves, these mocks will break.
     encryptService.encrypt.mockImplementation((p) => Promise.resolve(p as unknown as EncString));
     encryptService.decryptToUtf8.mockImplementation((c) => Promise.resolve(c as unknown as string));
-    keyService.getUserKey.mockImplementation(() => Promise.resolve(userKey));
     dataPacker.pack.mockImplementation((v) => v as string);
     dataPacker.unpack.mockImplementation(<T>(v: string) => v as T);
   });
@@ -35,37 +32,68 @@ describe("UserKeyEncryptor", () => {
     jest.resetAllMocks();
   });
 
-  describe("encrypt", () => {
-    it("should throw if value was not supplied", async () => {
-      const encryptor = new UserKeyEncryptor(encryptService, keyService, dataPacker);
+  describe("constructor", () => {
+    it("should set userId", async () => {
+      const encryptor = new UserKeyEncryptor(anyUserId, encryptService, userKey, dataPacker);
+      expect(encryptor.userId).toEqual(anyUserId);
+    });
 
-      await expect(encryptor.encrypt<Record<string, never>>(null, anyUserId)).rejects.toThrow(
-        "secret cannot be null or undefined",
+    it("should throw if userId was not supplied", async () => {
+      expect(() => new UserKeyEncryptor(null, encryptService, userKey, dataPacker)).toThrow(
+        "userId cannot be null or undefined",
       );
-      await expect(encryptor.encrypt<Record<string, never>>(undefined, anyUserId)).rejects.toThrow(
-        "secret cannot be null or undefined",
+      expect(() => new UserKeyEncryptor(null, encryptService, userKey, dataPacker)).toThrow(
+        "userId cannot be null or undefined",
       );
     });
 
-    it("should throw if userId was not supplied", async () => {
-      const encryptor = new UserKeyEncryptor(encryptService, keyService, dataPacker);
+    it("should throw if encryptService was not supplied", async () => {
+      expect(() => new UserKeyEncryptor(anyUserId, null, userKey, dataPacker)).toThrow(
+        "encryptService cannot be null or undefined",
+      );
+      expect(() => new UserKeyEncryptor(anyUserId, null, userKey, dataPacker)).toThrow(
+        "encryptService cannot be null or undefined",
+      );
+    });
 
-      await expect(encryptor.encrypt({}, null)).rejects.toThrow(
-        "userId cannot be null or undefined",
+    it("should throw if key was not supplied", async () => {
+      expect(() => new UserKeyEncryptor(anyUserId, encryptService, null, dataPacker)).toThrow(
+        "key cannot be null or undefined",
       );
-      await expect(encryptor.encrypt({}, undefined)).rejects.toThrow(
-        "userId cannot be null or undefined",
+      expect(() => new UserKeyEncryptor(anyUserId, encryptService, null, dataPacker)).toThrow(
+        "key cannot be null or undefined",
+      );
+    });
+
+    it("should throw if dataPacker was not supplied", async () => {
+      expect(() => new UserKeyEncryptor(anyUserId, encryptService, userKey, null)).toThrow(
+        "dataPacker cannot be null or undefined",
+      );
+      expect(() => new UserKeyEncryptor(anyUserId, encryptService, userKey, null)).toThrow(
+        "dataPacker cannot be null or undefined",
+      );
+    });
+  });
+
+  describe("encrypt", () => {
+    it("should throw if value was not supplied", async () => {
+      const encryptor = new UserKeyEncryptor(anyUserId, encryptService, userKey, dataPacker);
+
+      await expect(encryptor.encrypt<Record<string, never>>(null)).rejects.toThrow(
+        "secret cannot be null or undefined",
+      );
+      await expect(encryptor.encrypt<Record<string, never>>(undefined)).rejects.toThrow(
+        "secret cannot be null or undefined",
       );
     });
 
     it("should encrypt a packed value using the user's key", async () => {
-      const encryptor = new UserKeyEncryptor(encryptService, keyService, dataPacker);
+      const encryptor = new UserKeyEncryptor(anyUserId, encryptService, userKey, dataPacker);
       const value = { foo: true };
 
-      const result = await encryptor.encrypt(value, anyUserId);
+      const result = await encryptor.encrypt(value);
 
       // these are data flow expectations; the operations all all pass-through mocks
-      expect(keyService.getUserKey).toHaveBeenCalledWith(anyUserId);
       expect(dataPacker.pack).toHaveBeenCalledWith(value);
       expect(encryptService.encrypt).toHaveBeenCalledWith(value, userKey);
       expect(result).toBe(value);
@@ -74,35 +102,21 @@ describe("UserKeyEncryptor", () => {
 
   describe("decrypt", () => {
     it("should throw if secret was not supplied", async () => {
-      const encryptor = new UserKeyEncryptor(encryptService, keyService, dataPacker);
+      const encryptor = new UserKeyEncryptor(anyUserId, encryptService, userKey, dataPacker);
 
-      await expect(encryptor.decrypt(null, anyUserId)).rejects.toThrow(
+      await expect(encryptor.decrypt(null)).rejects.toThrow("secret cannot be null or undefined");
+      await expect(encryptor.decrypt(undefined)).rejects.toThrow(
         "secret cannot be null or undefined",
       );
-      await expect(encryptor.decrypt(undefined, anyUserId)).rejects.toThrow(
-        "secret cannot be null or undefined",
-      );
-    });
-
-    it("should throw if userId was not supplied", async () => {
-      const encryptor = new UserKeyEncryptor(encryptService, keyService, dataPacker);
-
-      await expect(encryptor.decrypt({} as any, null)).rejects.toThrow(
-        "userId cannot be null or undefined",
-      );
-      await expect(encryptor.decrypt({} as any, undefined)).rejects.toThrow(
-        "userId cannot be null or undefined",
-      );
     });
 
     it("should declassify a decrypted packed value using the user's key", async () => {
-      const encryptor = new UserKeyEncryptor(encryptService, keyService, dataPacker);
+      const encryptor = new UserKeyEncryptor(anyUserId, encryptService, userKey, dataPacker);
       const secret = "encrypted" as any;
 
-      const result = await encryptor.decrypt(secret, anyUserId);
+      const result = await encryptor.decrypt(secret);
 
       // these are data flow expectations; the operations all all pass-through mocks
-      expect(keyService.getUserKey).toHaveBeenCalledWith(anyUserId);
       expect(encryptService.decryptToUtf8).toHaveBeenCalledWith(secret, userKey);
       expect(dataPacker.unpack).toHaveBeenCalledWith(secret);
       expect(result).toBe(secret);