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[PM-3565] Enforce higher minimum KDF (#6440) 

Changes minimum iterations for PBKDF2 to 600 000. Also converts the constants into ranges to ensure there is only a single place for all checks.
This commit is contained in:
Oscar Hinton 2023-12-05 16:55:12 +01:00 committed by GitHub
parent 56860482b1
commit 7bbdee9daa
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GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 150 additions and 45 deletions
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4
apps/web/src/app/auth/settings/security/change-kdf/change-kdf-confirmation.component.ts
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@ -73,6 +73,10 @@ export class ChangeKdfConfirmationComponent {
const masterKey = await this.cryptoService.getOrDeriveMasterKey(masterPassword);
request.masterPasswordHash = await this.cryptoService.hashMasterKey(masterPassword, masterKey);
const email = await this.stateService.getEmail();
// Ensure the KDF config is valid.
this.cryptoService.validateKdfConfig(this.kdf, this.kdfConfig);
const newMasterKey = await this.cryptoService.makeMasterKey(
masterPassword,
email,

18
apps/web/src/app/auth/settings/security/change-kdf/change-kdf.component.html
View File

@ -31,8 +31,8 @@
<input
id="kdfMemory"
type="number"
min="16"
max="1024"
[min]="ARGON2_MEMORY.min"
[max]="ARGON2_MEMORY.max"
name="Memory"
class="form-control mb-3"
[(ngModel)]="kdfConfig.memory"
@ -57,8 +57,8 @@
<input
id="kdfIterations"
type="number"
min="100000"
max="2000000"
[min]="PBKDF2_ITERATIONS.min"
[max]="PBKDF2_ITERATIONS.max"
name="KdfIterations"
class="form-control"
[(ngModel)]="kdfConfig.iterations"
@ -70,8 +70,8 @@
<input
id="iterations"
type="number"
min="2"
max="10"
[min]="ARGON2_ITERATIONS.min"
[max]="ARGON2_ITERATIONS.max"
name="Iterations"
class="form-control mb-3"
[(ngModel)]="kdfConfig.iterations"
@ -81,8 +81,8 @@
<input
id="kdfParallelism"
type="number"
min="1"
max="16"
[min]="ARGON2_PARALLELISM.min"
[max]="ARGON2_PARALLELISM.max"
name="Parallelism"
class="form-control"
[(ngModel)]="kdfConfig.parallelism"
@ -94,7 +94,7 @@
<div class="col-12">
<ng-container *ngIf="kdf == kdfType.PBKDF2_SHA256">
<p class="small form-text text-muted">
{{ "kdfIterationsDesc" | i18n: (recommendedPbkdf2Iterations | number) }}
{{ "kdfIterationsDesc" | i18n: (PBKDF2_ITERATIONS.defaultValue | number) }}
</p>
<bit-callout type="warning">
{{ "kdfIterationsWarning" | i18n: (100000 | number) }}

23
apps/web/src/app/auth/settings/security/change-kdf/change-kdf.component.ts
View File

@ -4,10 +4,10 @@ import { KdfConfig } from "@bitwarden/common/auth/models/domain/kdf-config";
import { StateService } from "@bitwarden/common/platform/abstractions/state.service";
import {
DEFAULT_KDF_CONFIG,
DEFAULT_PBKDF2_ITERATIONS,
DEFAULT_ARGON2_ITERATIONS,
DEFAULT_ARGON2_MEMORY,
DEFAULT_ARGON2_PARALLELISM,
PBKDF2_ITERATIONS,
ARGON2_ITERATIONS,
ARGON2_MEMORY,
ARGON2_PARALLELISM,
KdfType,
} from "@bitwarden/common/platform/enums";
import { DialogService } from "@bitwarden/components";
@ -23,7 +23,12 @@ export class ChangeKdfComponent implements OnInit {
kdfConfig: KdfConfig = DEFAULT_KDF_CONFIG;
kdfType = KdfType;
kdfOptions: any[] = [];
recommendedPbkdf2Iterations = DEFAULT_PBKDF2_ITERATIONS;
// Default values for template
protected PBKDF2_ITERATIONS = PBKDF2_ITERATIONS;
protected ARGON2_ITERATIONS = ARGON2_ITERATIONS;
protected ARGON2_MEMORY = ARGON2_MEMORY;
protected ARGON2_PARALLELISM = ARGON2_PARALLELISM;
constructor(
private stateService: StateService,
@ -42,12 +47,12 @@ export class ChangeKdfComponent implements OnInit {
async onChangeKdf(newValue: KdfType) {
if (newValue === KdfType.PBKDF2_SHA256) {
this.kdfConfig = new KdfConfig(DEFAULT_PBKDF2_ITERATIONS);
this.kdfConfig = new KdfConfig(PBKDF2_ITERATIONS.defaultValue);
} else if (newValue === KdfType.Argon2id) {
this.kdfConfig = new KdfConfig(
DEFAULT_ARGON2_ITERATIONS,
DEFAULT_ARGON2_MEMORY,
DEFAULT_ARGON2_PARALLELISM,
ARGON2_ITERATIONS.defaultValue,
ARGON2_MEMORY.defaultValue,
ARGON2_PARALLELISM.defaultValue,
);
} else {
throw new Error("Unknown KDF type.");

6
apps/web/src/app/vault/individual-vault/vault.component.ts
View File

@ -47,7 +47,7 @@ import { LogService } from "@bitwarden/common/platform/abstractions/log.service"
import { MessagingService } from "@bitwarden/common/platform/abstractions/messaging.service";
import { PlatformUtilsService } from "@bitwarden/common/platform/abstractions/platform-utils.service";
import { StateService } from "@bitwarden/common/platform/abstractions/state.service";
import { DEFAULT_PBKDF2_ITERATIONS, KdfType } from "@bitwarden/common/platform/enums";
import { KdfType, PBKDF2_ITERATIONS } from "@bitwarden/common/platform/enums";
import { Utils } from "@bitwarden/common/platform/misc/utils";
import { CipherService } from "@bitwarden/common/vault/abstractions/cipher.service";
import { CollectionService } from "@bitwarden/common/vault/abstractions/collection.service";
@ -967,7 +967,9 @@ export class VaultComponent implements OnInit, OnDestroy {
async isLowKdfIteration() {
const kdfType = await this.stateService.getKdfType();
const kdfOptions = await this.stateService.getKdfConfig();
return kdfType === KdfType.PBKDF2_SHA256 && kdfOptions.iterations < DEFAULT_PBKDF2_ITERATIONS;
return (
kdfType === KdfType.PBKDF2_SHA256 && kdfOptions.iterations < PBKDF2_ITERATIONS.defaultValue
);
}
protected async repromptCipher(ciphers: CipherView[]) {

8
libs/common/src/platform/abstractions/crypto.service.ts
View File

@ -390,6 +390,14 @@ export abstract class CryptoService {
privateKey: EncString;
}>;
/**
* Validate that the KDF config follows the requirements for the given KDF type.
*
* @remarks
* Should always be called before updating a users KDF config.
*/
validateKdfConfig: (kdf: KdfType, kdfConfig: KdfConfig) => void;
/**
* @deprecated Left for migration purposes. Use decryptUserKeyWithPin instead.
*/

11
libs/common/src/platform/enums/kdf-type.enum.ts
View File

@ -1,14 +1,15 @@
import { KdfConfig } from "../../auth/models/domain/kdf-config";
import { RangeWithDefault } from "../misc/range-with-default";
export enum KdfType {
PBKDF2_SHA256 = 0,
Argon2id = 1,
}
export const DEFAULT_ARGON2_MEMORY = 64;
export const DEFAULT_ARGON2_PARALLELISM = 4;
export const DEFAULT_ARGON2_ITERATIONS = 3;
export const ARGON2_MEMORY = new RangeWithDefault(16, 1024, 64);
export const ARGON2_PARALLELISM = new RangeWithDefault(1, 16, 4);
export const ARGON2_ITERATIONS = new RangeWithDefault(2, 10, 3);
export const DEFAULT_KDF_TYPE = KdfType.PBKDF2_SHA256;
export const DEFAULT_PBKDF2_ITERATIONS = 600000;
export const DEFAULT_KDF_CONFIG = new KdfConfig(DEFAULT_PBKDF2_ITERATIONS);
export const PBKDF2_ITERATIONS = new RangeWithDefault(600_000, 2_000_000, 600_000);
export const DEFAULT_KDF_CONFIG = new KdfConfig(PBKDF2_ITERATIONS.defaultValue);

26
libs/common/src/platform/misc/range-with-default.spec.ts Normal file
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@ -0,0 +1,26 @@
import { RangeWithDefault } from "./range-with-default";
describe("RangeWithDefault", () => {
describe("constructor", () => {
it("should throw an error when min is greater than max", () => {
expect(() => new RangeWithDefault(10, 5, 0)).toThrowError("10 is greater than 5.");
});
it("should throw an error when default value is not in range", () => {
expect(() => new RangeWithDefault(0, 10, 20)).toThrowError("Default value is not in range.");
});
});
describe("inRange", () => {
it("should return true when in range", () => {
const range = new RangeWithDefault(0, 10, 5);
expect(range.inRange(5)).toBe(true);
});
it("should return false when not in range", () => {
const range = new RangeWithDefault(5, 10, 7);
expect(range.inRange(1)).toBe(false);
expect(range.inRange(20)).toBe(false);
});
});
});

24
libs/common/src/platform/misc/range-with-default.ts Normal file
View File

@ -0,0 +1,24 @@
/**
* A range with a default value.
*
* Enforces constraints to ensure min > default > max.
*/
export class RangeWithDefault {
constructor(
readonly min: number,
readonly max: number,
readonly defaultValue: number,
) {
if (min > max) {
throw new Error(`${min} is greater than ${max}.`);
}
if (this.inRange(defaultValue) === false) {
throw new Error("Default value is not in range.");
}
}
inRange(value: number): boolean {
return value >= this.min && value <= this.max;
}
}

69
libs/common/src/platform/services/crypto.service.ts
View File

@ -17,10 +17,11 @@ import {
KeySuffixOptions,
HashPurpose,
KdfType,
DEFAULT_ARGON2_ITERATIONS,
DEFAULT_ARGON2_MEMORY,
DEFAULT_ARGON2_PARALLELISM,
ARGON2_ITERATIONS,
ARGON2_MEMORY,
ARGON2_PARALLELISM,
EncryptionType,
PBKDF2_ITERATIONS,
} from "../enums";
import { sequentialize } from "../misc/sequentialize";
import { EFFLongWordList } from "../misc/wordlist";
@ -175,6 +176,12 @@ export class CryptoService implements CryptoServiceAbstraction {
));
}
/**
* Derive a master key from a password and email.
*
* @remarks
* Does not validate the kdf config to ensure it satisfies the minimum requirements for the given kdf type.
*/
async makeMasterKey(
password: string,
email: string,
@ -841,6 +848,43 @@ export class CryptoService implements CryptoServiceAbstraction {
return null;
}
/**
* Validate that the KDF config follows the requirements for the given KDF type.
*
* @remarks
* Should always be called before updating a users KDF config.
*/
validateKdfConfig(kdf: KdfType, kdfConfig: KdfConfig): void {
switch (kdf) {
case KdfType.PBKDF2_SHA256:
if (!PBKDF2_ITERATIONS.inRange(kdfConfig.iterations)) {
throw new Error(
`PBKDF2 iterations must be between ${PBKDF2_ITERATIONS.min} and ${PBKDF2_ITERATIONS.max}`,
);
}
break;
case KdfType.Argon2id:
if (!ARGON2_ITERATIONS.inRange(kdfConfig.iterations)) {
throw new Error(
`Argon2 iterations must be between ${ARGON2_ITERATIONS.min} and ${ARGON2_ITERATIONS.max}`,
);
}
if (!ARGON2_MEMORY.inRange(kdfConfig.memory)) {
throw new Error(
`Argon2 memory must be between ${ARGON2_MEMORY.min}mb and ${ARGON2_MEMORY.max}mb`,
);
}
if (!ARGON2_PARALLELISM.inRange(kdfConfig.parallelism)) {
throw new Error(
`Argon2 parallelism must be between ${ARGON2_PARALLELISM.min} and ${ARGON2_PARALLELISM.max}.`,
);
}
break;
}
}
protected async clearAllStoredUserKeys(userId?: string): Promise<void> {
await this.stateService.setUserKeyAutoUnlock(null, { userId: userId });
await this.stateService.setPinKeyEncryptedUserKeyEphemeral(null, { userId: userId });
@ -900,30 +944,21 @@ export class CryptoService implements CryptoServiceAbstraction {
let key: Uint8Array = null;
if (kdf == null || kdf === KdfType.PBKDF2_SHA256) {
if (kdfConfig.iterations == null) {
kdfConfig.iterations = 5000;
} else if (kdfConfig.iterations < 5000) {
throw new Error("PBKDF2 iteration minimum is 5000.");
kdfConfig.iterations = PBKDF2_ITERATIONS.defaultValue;
}
key = await this.cryptoFunctionService.pbkdf2(password, salt, "sha256", kdfConfig.iterations);
} else if (kdf == KdfType.Argon2id) {
if (kdfConfig.iterations == null) {
kdfConfig.iterations = DEFAULT_ARGON2_ITERATIONS;
} else if (kdfConfig.iterations < 2) {
throw new Error("Argon2 iteration minimum is 2.");
kdfConfig.iterations = ARGON2_ITERATIONS.defaultValue;
}
if (kdfConfig.memory == null) {
kdfConfig.memory = DEFAULT_ARGON2_MEMORY;
} else if (kdfConfig.memory < 16) {
throw new Error("Argon2 memory minimum is 16 MB");
} else if (kdfConfig.memory > 1024) {
throw new Error("Argon2 memory maximum is 1024 MB");
kdfConfig.memory = ARGON2_MEMORY.defaultValue;
}
if (kdfConfig.parallelism == null) {
kdfConfig.parallelism = DEFAULT_ARGON2_PARALLELISM;
} else if (kdfConfig.parallelism < 1) {
throw new Error("Argon2 parallelism minimum is 1.");
kdfConfig.parallelism = ARGON2_PARALLELISM.defaultValue;
}
const saltHash = await this.cryptoFunctionService.hash(salt, "sha256");

6
libs/exporter/src/vault-export/services/vault-export.service.spec.ts
View File

@ -5,7 +5,7 @@ import { KdfConfig } from "@bitwarden/common/auth/models/domain/kdf-config";
import { CipherWithIdExport } from "@bitwarden/common/models/export/cipher-with-ids.export";
import { CryptoFunctionService } from "@bitwarden/common/platform/abstractions/crypto-function.service";
import { CryptoService } from "@bitwarden/common/platform/abstractions/crypto.service";
import { KdfType, DEFAULT_PBKDF2_ITERATIONS } from "@bitwarden/common/platform/enums";
import { KdfType, PBKDF2_ITERATIONS } from "@bitwarden/common/platform/enums";
import { Utils } from "@bitwarden/common/platform/misc/utils";
import { EncryptedString, EncString } from "@bitwarden/common/platform/models/domain/enc-string";
import { StateService } from "@bitwarden/common/platform/services/state.service";
@ -159,7 +159,7 @@ describe("VaultExportService", () => {
folderService.getAllDecryptedFromState.mockResolvedValue(UserFolderViews);
folderService.getAllFromState.mockResolvedValue(UserFolders);
stateService.getKdfType.mockResolvedValue(KdfType.PBKDF2_SHA256);
stateService.getKdfConfig.mockResolvedValue(new KdfConfig(DEFAULT_PBKDF2_ITERATIONS));
stateService.getKdfConfig.mockResolvedValue(new KdfConfig(PBKDF2_ITERATIONS.defaultValue));
cryptoService.encrypt.mockResolvedValue(new EncString("encrypted"));
exportService = new VaultExportService(
@ -240,7 +240,7 @@ describe("VaultExportService", () => {
});
it("specifies kdfIterations", () => {
expect(exportObject.kdfIterations).toEqual(DEFAULT_PBKDF2_ITERATIONS);
expect(exportObject.kdfIterations).toEqual(PBKDF2_ITERATIONS.defaultValue);
});
it("has kdfType", () => {