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ses - npm Package Compare versions
Comparing version 0.10.3 to 0.10.4
@@ -1,1 +0,1 @@ | ||
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a.prototype=Jt,a},qt=C(),Qt=Kt(Kt,function(t){const e=Z();return e.addIntrinsics(X(t,G)),e.finalIntrinsics()}(globalThis),qt);t(globalThis,{harden:t=>(it(Wt,"Cannot harden before lockdown"),zt(t)),lockdown:((t,e,r)=>(e={})=>Yt(t,0,r,e)())(Kt,0,(function(){const t=Function.prototype.constructor,e=typeof Symbol&&Symbol.iterator||"@@iterator",r=typeof Symbol&&Symbol.matchAll||"@@matchAll",o=a(arguments,"callee").get,n=(new String)[e](),i=s(n),c=(new RegExp)[r](),p=s(c),l=(new Array)[e](),u=s(l),y=s(Float32Array),f=(new Map)[e](),g=s(f),m=(new Set)[e](),d=s(m),P=s(u);function*b(){}const h=et(b),S=h.prototype;async function*w(){}const E=et(w),I=E.prototype,T=I.prototype,A=s(T);async function v(){}const F=et(v),x={"%InertFunction%":t,"%ArrayIteratorPrototype%":u,"%InertAsyncFunction%":F,"%AsyncGenerator%":I,"%InertAsyncGeneratorFunction%":E,"%AsyncGeneratorPrototype%":T,"%AsyncIteratorPrototype%":A,"%Generator%":S,"%InertGeneratorFunction%":h,"%IteratorPrototype%":P,"%MapIteratorPrototype%":g,"%RegExpStringIteratorPrototype%":p,"%SetIteratorPrototype%":d,"%StringIteratorPrototype%":i,"%ThrowTypeError%":o,"%TypedArray%":y,"%InertCompartment%":tt};return x})),Compartment:Qt})})); |
@@ -20,2 +20,3 @@ // Copyright (C) 2018 Agoric | ||
| import { getGlobalIntrinsics } from './src/intrinsics.js'; | ||
| import { getAnonymousIntrinsics } from './src/get-anonymous-intrinsics.js'; | ||
| import { makeLockdown, harden } from './src/lockdown-shim.js'; | ||
@@ -39,4 +40,8 @@ import { | ||
| harden, | ||
| lockdown: makeLockdown(makeCompartmentConstructor, CompartmentPrototype), | ||
| lockdown: makeLockdown( | ||
| makeCompartmentConstructor, | ||
| CompartmentPrototype, | ||
| getAnonymousIntrinsics, | ||
| ), | ||
| Compartment, | ||
| }); |
| { | ||
| "name": "ses", | ||
| "version": "0.10.3", | ||
| "version": "0.10.4", | ||
| "description": "Secure ECMAScript", | ||
@@ -5,0 +5,0 @@ "author": "Agoric", |
@@ -275,3 +275,18 @@ # Secure EcmaScript (SES) | ||
| ### Imperfect emulation | ||
| JavaScript suffers from the so-called | ||
| [override mistake](https://web.archive.org/web/20141230041441/http://wiki.ecmascript.org/doku.php?id=strawman:fixing_override_mistake), | ||
| which prevents lockdown from *simply* hardening all the primordials. Rather, | ||
| for each of | ||
| [these data properties](src/enablements.js), we convert it to an accessor | ||
| property whose getter and setter emulate [a data property without the override | ||
| mistake](https://github.com/tc39/ecma262/pull/1320). For non-reflective code | ||
| the illusion is perfect. But reflective code sees that it is an accessor | ||
| rather than a data property. We add a `originalValue` property to the getter | ||
| of that accessor, letting reflective code know that a getter alleges that it | ||
| results from this transform, and what the original data value was. This enables | ||
| a form of cooperative emulation, where that code can decide whether to uphold | ||
| the illusion by pretending it sees the data property that would have been there. | ||
| ## Bug Disclosure | ||
@@ -278,0 +293,0 @@ |
@@ -18,2 +18,3 @@ // Copyright (C) 2018 Agoric | ||
| import { getGlobalIntrinsics } from './src/intrinsics.js'; | ||
| import { getModularAnonymousIntrinsics } from './src/get-anonymous-intrinsics.js'; | ||
| import { makeLockdown, harden } from './src/lockdown-shim.js'; | ||
@@ -44,2 +45,3 @@ import { whitelist, modulesWhitelist } from './src/whitelist.js'; | ||
| CompartmentPrototype, | ||
| getModularAnonymousIntrinsics, | ||
| ), | ||
@@ -46,0 +48,0 @@ Compartment: ModularCompartment, |
@@ -8,3 +8,3 @@ /** | ||
| * We capture these, not just for brevity, but for security. If any code | ||
| * modifies Object to change what 'assign' points to, the Compatment shim | ||
| * modifies Object to change what 'assign' points to, the Compartment shim | ||
| * would be corrupted. | ||
@@ -11,0 +11,0 @@ */ |
| // Adapted from SES/Caja | ||
| // Copyright (C) 2011 Google Inc. | ||
| // @ts-check | ||
| import { | ||
@@ -9,6 +11,5 @@ defineProperty, | ||
| getOwnPropertyDescriptors, | ||
| objectHasOwnProperty, | ||
| } from './commons.js'; | ||
| // https://github.com/google/caja/blob/master/src/com/google/caja/ses/startSES.js | ||
| // https://github.com/google/caja/blob/master/src/com/google/caja/ses/repairES5.js | ||
| import enablements from './enablements.js'; | ||
@@ -23,20 +24,54 @@ | ||
| /** | ||
| * For a special set of properties (defined in the enablement plan), it ensures | ||
| * that the effect of freezing does not suppress the ability to override | ||
| * these properties on derived objects by simple assignment. | ||
| * For a special set of properties defined in the `enablement` whitelist, | ||
| * `enablePropertyOverrides` ensures that the effect of freezing does not | ||
| * suppress the ability to override these properties on derived objects by | ||
| * simple assignment. | ||
| * | ||
| * Because of lack of sufficient foresight at the time, ES5 unfortunately | ||
| * specified that a simple assignment to a non-existent property must fail if | ||
| * it would override a non-writable data property of the same name. (In | ||
| * retrospect, this was a mistake, but it is now too late and we must live | ||
| * with the consequences.) As a result, simply freezing an object to make it | ||
| * tamper proof has the unfortunate side effect of breaking previously correct | ||
| * code that is considered to have followed JS best practices, if this | ||
| * previous code used assignment to override. | ||
| * it would override an non-writable data property of the same name in the | ||
| * shadow of the prototype chain. In retrospect, this was a mistake, the | ||
| * so-called "override mistake". But it is now too late and we must live with | ||
| * the consequences. | ||
| * | ||
| * As a result, simply freezing an object to make it tamper proof has the | ||
| * unfortunate side effect of breaking previously correct code that is | ||
| * considered to have followed JS best practices, if this previous code used | ||
| * assignment to override. | ||
| * | ||
| * For the enabled properties, `enablePropertyOverrides` effectively shims what | ||
| * the assignment behavior would have been in the absence of the override | ||
| * mistake. However, the shim produces an imperfect emulation. It shims the | ||
| * behavior by turning these data properties into accessor properties, where | ||
| * the accessor's getter and setter provide the desired behavior. For | ||
| * non-reflective operations, the illusion is perfect. However, reflective | ||
| * operations like `getOwnPropertyDescriptor` see the descriptor of an accessor | ||
| * property rather than the descriptor of a data property. At the time of this | ||
| * writing, this is the best we know how to do. | ||
| * | ||
| * To the getter of the accessor we add a property named | ||
| * `'originalValue'` whose value is, as it says, the value that the | ||
| * data property had before being converted to an accessor property. We add | ||
| * this extra property to the getter for two reason: | ||
| * | ||
| * The harden algorithm walks the own properties reflectively, i.e., with | ||
| * `getOwnPropertyDescriptor` semantics, rather than `[[Get]]` semantics. When | ||
| * it sees an accessor property, it does not invoke the getter. Rather, it | ||
| * proceeds to walk both the getter and setter as part of its transitive | ||
| * traversal. Without this extra property, `enablePropertyOverrides` would have | ||
| * hidden the original data property value from `harden`, which would be bad. | ||
| * Instead, by exposing that value in an own data property on the getter, | ||
| * `harden` finds and walks it anyway. | ||
| * | ||
| * We enable a form of cooperative emulation, giving reflective code an | ||
| * opportunity to cooperate in upholding the illusion. When such cooperative | ||
| * reflective code sees an accessor property, where the accessor's getter | ||
| * has an `originalValue` property, it knows that the getter is | ||
| * alleging that it is the result of the `enablePropertyOverrides` conversion | ||
| * pattern, so it can decide to cooperatively "pretend" that it sees a data | ||
| * property with that value. | ||
| * | ||
| * @param {Record<string, any>} intrinsics | ||
| */ | ||
| // TODO exmplain parameters | ||
| export default function enablePropertyOverrides(intrinsics) { | ||
| const detachedProperties = {}; | ||
| function enable(path, obj, prop, desc) { | ||
@@ -46,7 +81,11 @@ if ('value' in desc && desc.configurable) { | ||
| detachedProperties[path] = value; | ||
| function getter() { | ||
| return value; | ||
| } | ||
| defineProperty(getter, 'originalValue', { | ||
| value, | ||
| writable: false, | ||
| enumerable: false, | ||
| configurable: false, | ||
| }); | ||
@@ -59,3 +98,3 @@ function setter(newValue) { | ||
| } | ||
| if (hasOwnProperty.call(this, prop)) { | ||
| if (objectHasOwnProperty(this, prop)) { | ||
| this[prop] = newValue; | ||
@@ -125,4 +164,2 @@ } else { | ||
| enableProperties('root', intrinsics, enablements); | ||
| return detachedProperties; | ||
| } |
@@ -67,3 +67,2 @@ /** | ||
| bind: true, // set by "underscore" | ||
| apply: true, // set by "tape" | ||
| name: true, | ||
@@ -70,0 +69,0 @@ toString: true, |
@@ -111,3 +111,2 @@ import { getOwnPropertyDescriptor, getPrototypeOf } from './commons.js'; | ||
| '%InertCompartment%': InertCompartment, | ||
| '%InertStaticModuleRecord%': InertStaticModuleRecord, | ||
| }; | ||
@@ -117,1 +116,8 @@ | ||
| } | ||
| export function getModularAnonymousIntrinsics() { | ||
| return { | ||
| ...getAnonymousIntrinsics(), | ||
| '%InertStaticModuleRecord%': InertStaticModuleRecord, | ||
| }; | ||
| } |
@@ -30,3 +30,2 @@ // Copyright (C) 2018 Agoric | ||
| import tameLocaleMethods from './tame-locale-methods.js'; | ||
| import { getAnonymousIntrinsics } from './get-anonymous-intrinsics.js'; | ||
| import { initGlobalObject } from './global-object.js'; | ||
@@ -56,2 +55,3 @@ import { initialGlobalPropertyNames } from './whitelist.js'; | ||
| compartmentPrototype, | ||
| getAnonymousIntrinsics, | ||
| options = {}, | ||
@@ -158,3 +158,3 @@ ) { | ||
| // Circumvent the override mistake. | ||
| const detachedProperties = enablePropertyOverrides(intrinsics); | ||
| enablePropertyOverrides(intrinsics); | ||
@@ -164,3 +164,2 @@ // Finally register and optionally freeze all the intrinsics. This | ||
| lockdownHarden(intrinsics); | ||
| lockdownHarden(detachedProperties); | ||
@@ -183,2 +182,3 @@ // Having completed lockdown without failing, the user may now | ||
| compartmentPrototype, | ||
| getAnonymousIntrinsics, | ||
| ) => { | ||
@@ -189,2 +189,3 @@ const lockdown = (options = {}) => { | ||
| compartmentPrototype, | ||
| getAnonymousIntrinsics, | ||
| options, | ||
@@ -191,0 +192,0 @@ ); |
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Fixed alerts
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Improved metrics
- Total package byte prevSize
- increased by0.1%
12073099
- Lines of code
- increased by0.08%
300759
- Number of lines in readme file
- increased by5.26%
300
No dependency changes