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/**
* Provides classes modeling security-relevant aspects of the `aiohttp` PyPI package.
* See https://docs.aiohttp.org/en/stable/index.html
*/
private import python
private import semmle.python.dataflow.new.DataFlow
private import semmle.python.dataflow.new.RemoteFlowSources
private import semmle.python.dataflow.new.TaintTracking
private import semmle.python.Concepts
private import semmle.python.ApiGraphs
private import semmle.python.frameworks.internal.PoorMansFunctionResolution
private import semmle.python.frameworks.internal.SelfRefMixin
private import semmle.python.frameworks.Multidict
private import semmle.python.frameworks.Yarl
private import semmle.python.frameworks.internal.InstanceTaintStepsHelper
/**
* INTERNAL: Do not use.
*
* Provides models for the web server part (`aiohttp.web`) of the `aiohttp` PyPI package.
* See https://docs.aiohttp.org/en/stable/web.html
*/
module AiohttpWebModel {
/**
* Provides models for the `aiohttp.web.View` class and subclasses.
*
* See https://docs.aiohttp.org/en/stable/web_reference.html#view.
*/
module View {
/** Gets a reference to the `aiohttp.web.View` class or any subclass. */
API::Node subclassRef() {
result = API::moduleImport("aiohttp").getMember("web").getMember("View").getASubclass*()
}
}
// -- route modeling --
/** Gets a reference to an `aiohttp.web.Application` instance. */
API::Node applicationInstance() {
// Not sure whether you're allowed to add routes _after_ starting the app, for
// example in the middle of handling a http request... but I'm guessing that for 99%
// for all code, not modeling that `request.app` is a reference to an application
// should be good enough for the route-setup part of the modeling :+1:
result = API::moduleImport("aiohttp").getMember("web").getMember("Application").getReturn()
}
/** Gets a reference to an `aiohttp.web.UrlDispatcher` instance. */
API::Node urlDispathcerInstance() {
result = API::moduleImport("aiohttp").getMember("web").getMember("UrlDispatcher").getReturn()
or
result = applicationInstance().getMember("router")
}
/**
* A route setup in `aiohttp.web`. Since all route-setups can technically use either
* coroutines or view-classes as the handler argument (although that's not how you're
* **supposed** to do things), we also need to handle this.
*
* Extend this class to refine existing API models. If you want to model new APIs,
* extend `AiohttpRouteSetup::Range` instead.
*/
class AiohttpRouteSetup extends HTTP::Server::RouteSetup::Range {
AiohttpRouteSetup::Range range;
AiohttpRouteSetup() { this = range }
override Parameter getARoutedParameter() { none() }
override string getFramework() { result = "aiohttp.web" }
/** Gets the argument specifying the handler (either a coroutine or a view-class). */
DataFlow::Node getHandlerArg() { result = range.getHandlerArg() }
override DataFlow::Node getUrlPatternArg() { result = range.getUrlPatternArg() }
/** Gets the view-class that is referenced in the view-class handler argument, if any. */
Class getViewClass() { result = range.getViewClass() }
override Function getARequestHandler() { result = range.getARequestHandler() }
}
/** Provides a class for modeling new aiohttp.web route setups. */
private module AiohttpRouteSetup {
/**
* A route setup in `aiohttp.web`. Since all route-setups can technically use either
* coroutines or view-classes as the handler argument (although that's not how you're
* **supposed** to do things), we also need to handle this.
*
* Extend this class to model new APIs. If you want to refine existing API models,
* extend `AiohttpRouteSetup` instead.
*/
abstract class Range extends DataFlow::Node {
/** Gets the argument used to set the URL pattern. */
abstract DataFlow::Node getUrlPatternArg();
/** Gets the argument specifying the handler (either a coroutine or a view-class). */
abstract DataFlow::Node getHandlerArg();
/** Gets the view-class that is referenced in the view-class handler argument, if any. */
Class getViewClass() { result = getBackTrackedViewClass(this.getHandlerArg()) }
/**
* Gets a function that will handle incoming requests for this route, if any.
*
* NOTE: This will be modified in the near future to have a `RequestHandler` result, instead of a `Function`.
*/
Function getARequestHandler() {
this.getHandlerArg() = poorMansFunctionTracker(result)
or
result = this.getViewClass().(AiohttpViewClass).getARequestHandler()
}
}
/**
* Gets a reference to a class, that has been backtracked from the view-class handler
* argument `origin` (to a route-setup for view-classes).
*/
private DataFlow::TypeTrackingNode viewClassBackTracker(
DataFlow::TypeBackTracker t, DataFlow::Node origin
) {
t.start() and
origin = any(Range rs).getHandlerArg() and
result = origin.getALocalSource()
or
exists(DataFlow::TypeBackTracker t2 |
result = viewClassBackTracker(t2, origin).backtrack(t2, t)
)
}
/**
* Gets a reference to a class, that has been backtracked from the view-class handler
* argument `origin` (to a route-setup for view-classes).
*/
DataFlow::LocalSourceNode viewClassBackTracker(DataFlow::Node origin) {
result = viewClassBackTracker(DataFlow::TypeBackTracker::end(), origin)
}
Class getBackTrackedViewClass(DataFlow::Node origin) {
result.getParent() = viewClassBackTracker(origin).asExpr()
}
}
/** An aiohttp route setup that uses coroutines (async function) as request handlers. */
class AiohttpCoroutineRouteSetup extends AiohttpRouteSetup {
AiohttpCoroutineRouteSetup() { this.getHandlerArg() = poorMansFunctionTracker(_) }
}
/** An aiohttp route setup that uses view-classes as request handlers. */
class AiohttpViewRouteSetup extends AiohttpRouteSetup {
AiohttpViewRouteSetup() { exists(this.getViewClass()) }
}
/**
* A route-setup from
* - `add_route`, `add_view`, `add_get`, `add_post`, , etc. on an `aiohttp.web.UrlDispatcher`.
* - `route`, `view`, `get`, `post`, etc. functions from `aiohttp.web`.
*/
class AiohttpAddRouteCall extends AiohttpRouteSetup::Range, DataFlow::CallCfgNode {
/** At what index route arguments starts, so we can handle "route" version together with get/post/... */
int routeArgsStart;
AiohttpAddRouteCall() {
exists(string funcName |
funcName = HTTP::httpVerbLower() and
routeArgsStart = 0
or
funcName = "view" and
routeArgsStart = 0
or
funcName = "route" and
routeArgsStart = 1
|
this = urlDispathcerInstance().getMember("add_" + funcName).getACall()
or
this = API::moduleImport("aiohttp").getMember("web").getMember(funcName).getACall()
)
}
override DataFlow::Node getUrlPatternArg() {
result in [this.getArg(routeArgsStart + 0), this.getArgByName("path")]
}
override DataFlow::Node getHandlerArg() {
result in [this.getArg(routeArgsStart + 1), this.getArgByName("handler")]
}
}
/** A route-setup using a decorator, such as `route`, `view`, `get`, `post`, etc. on an `aiohttp.web.RouteTableDef`. */
class AiohttpDecoratorRouteSetup extends AiohttpRouteSetup::Range, DataFlow::CallCfgNode {
/** At what index route arguments starts, so we can handle "route" version together with get/post/... */
int routeArgsStart;
AiohttpDecoratorRouteSetup() {
exists(string decoratorName |
decoratorName = HTTP::httpVerbLower() and
routeArgsStart = 0
or
decoratorName = "view" and
routeArgsStart = 0
or
decoratorName = "route" and
routeArgsStart = 1
|
this =
API::moduleImport("aiohttp")
.getMember("web")
.getMember("RouteTableDef")
.getReturn()
.getMember(decoratorName)
.getACall()
)
}
override DataFlow::Node getUrlPatternArg() {
result in [this.getArg(routeArgsStart + 0), this.getArgByName("path")]
}
override DataFlow::Node getHandlerArg() { none() }
override Class getViewClass() { result.getADecorator() = this.asExpr() }
override Function getARequestHandler() {
// we're decorating a class
exists(this.getViewClass()) and
result = super.getARequestHandler()
or
// we're decorating a function
not exists(this.getViewClass()) and
result.getADecorator() = this.asExpr()
}
}
/** A class that we consider an aiohttp.web View class. */
abstract class AiohttpViewClass extends Class, SelfRefMixin {
/** Gets a function that could handle incoming requests, if any. */
Function getARequestHandler() {
// TODO: This doesn't handle attribute assignment. Should be OK, but analysis is not as complete as with
// points-to and `.lookup`, which would handle `post = my_post_handler` inside class def
result = this.getAMethod() and
result.getName() = HTTP::httpVerbLower()
}
}
/** A class that has a super-type which is an aiohttp.web View class. */
class AiohttpViewClassFromSuperClass extends AiohttpViewClass {
AiohttpViewClassFromSuperClass() { this.getABase() = View::subclassRef().getAUse().asExpr() }
}
/** A class that is used in a route-setup, therefore being considered an aiohttp.web View class. */
class AiohttpViewClassFromRouteSetup extends AiohttpViewClass {
AiohttpViewClassFromRouteSetup() { this = any(AiohttpRouteSetup rs).getViewClass() }
}
/** A request handler defined in an `aiohttp.web` view class, that has no known route. */
private class AiohttpViewClassRequestHandlerWithoutKnownRoute extends HTTP::Server::RequestHandler::Range {
AiohttpViewClassRequestHandlerWithoutKnownRoute() {
exists(AiohttpViewClass vc | vc.getARequestHandler() = this) and
not exists(AiohttpRouteSetup setup | setup.getARequestHandler() = this)
}
override Parameter getARoutedParameter() { none() }
override string getFramework() { result = "aiohttp.web" }
}
// ---------------------------------------------------------------------------
// aiohttp.web.Request taint modeling
// ---------------------------------------------------------------------------
/**
* Provides models for the `aiohttp.web.Request` class
*
* See https://docs.aiohttp.org/en/stable/web_reference.html#request-and-base-request
*/
module Request {
/**
* A source of instances of `aiohttp.web.Request`, extend this class to model new instances.
*
* This can include instantiations of the class, return values from function
* calls, or a special parameter that will be set when functions are called by an external
* library.
*
* Use `Request::instance()` predicate to get
* references to instances of `aiohttp.web.Request`.
*/
abstract class InstanceSource extends DataFlow::LocalSourceNode { }
/** Gets a reference to an instance of `aiohttp.web.Request`. */
private DataFlow::TypeTrackingNode instance(DataFlow::TypeTracker t) {
t.start() and
result instanceof InstanceSource
or
exists(DataFlow::TypeTracker t2 | result = instance(t2).track(t2, t))
}
/** Gets a reference to an instance of `aiohttp.web.Request`. */
DataFlow::Node instance() { instance(DataFlow::TypeTracker::end()).flowsTo(result) }
/**
* Taint propagation for `aiohttp.web.Request`.
*/
private class InstanceTaintSteps extends InstanceTaintStepsHelper {
InstanceTaintSteps() { this = "aiohttp.web.Request" }
override DataFlow::Node getInstance() { result = instance() }
override string getAttributeName() {
result in [
"url", "rel_url", "forwarded", "host", "remote", "path", "path_qs", "raw_path", "query",
"headers", "transport", "cookies", "content", "_payload", "content_type", "charset",
"http_range", "if_modified_since", "if_unmodified_since", "if_range", "match_info"
]
}
override string getMethodName() { result in ["clone", "get_extra_info"] }
override string getAsyncMethodName() {
result in ["read", "text", "json", "multipart", "post"]
}
}
/** An attribute read on an `aiohttp.web.Request` that is a `MultiDictProxy` instance. */
class AiohttpRequestMultiDictProxyInstances extends Multidict::MultiDictProxy::InstanceSource {
AiohttpRequestMultiDictProxyInstances() {
this.(DataFlow::AttrRead).getObject() = Request::instance() and
this.(DataFlow::AttrRead).getAttributeName() in ["query", "headers"]
or
// Handle the common case of `x = await request.post()`
// but don't try to handle anything else, since we don't have an easy way to do this yet.
// TODO: more complete handling of `await request.post()`
exists(Await await, DataFlow::CallCfgNode call, DataFlow::AttrRead read |
this.asExpr() = await
|
read.getObject() = Request::instance() and
read.getAttributeName() = "post" and
call.getFunction() = read and
await.getValue() = call.asExpr()
)
}
}
/** An attribute read on an `aiohttp.web.Request` that is a `yarl.URL` instance. */
class AiohttpRequestYarlUrlInstances extends Yarl::Url::InstanceSource {
AiohttpRequestYarlUrlInstances() {
this.(DataFlow::AttrRead).getObject() = Request::instance() and
this.(DataFlow::AttrRead).getAttributeName() in ["url", "rel_url"]
}
}
/** An attribute read on an `aiohttp.web.Request` that is a `aiohttp.StreamReader` instance. */
class AiohttpRequestStreamReaderInstances extends StreamReader::InstanceSource {
AiohttpRequestStreamReaderInstances() {
this.(DataFlow::AttrRead).getObject() = Request::instance() and
this.(DataFlow::AttrRead).getAttributeName() in ["content", "_payload"]
}
}
}
/**
* Provides models for the `aiohttp.web.Response` class
*
* See https://docs.aiohttp.org/en/stable/web_reference.html#response-classes
*/
module Response {
/**
* A source of instances of `aiohttp.web.Response`, extend this class to model new instances.
*
* This can include instantiations of the class, return values from function
* calls, or a special parameter that will be set when functions are called by an external
* library.
*
* Use `Response::instance()` predicate to get
* references to instances of `aiohttp.web.Response`.
*/
abstract class InstanceSource extends DataFlow::LocalSourceNode { }
/** Gets a reference to an instance of `aiohttp.web.Response`. */
private DataFlow::TypeTrackingNode instance(DataFlow::TypeTracker t) {
t.start() and
result instanceof InstanceSource
or
exists(DataFlow::TypeTracker t2 | result = instance(t2).track(t2, t))
}
/** Gets a reference to an instance of `aiohttp.web.Response`. */
DataFlow::Node instance() { instance(DataFlow::TypeTracker::end()).flowsTo(result) }
}
/**
* Provides models for the `aiohttp.StreamReader` class
*
* See https://docs.aiohttp.org/en/stable/streams.html#aiohttp.StreamReader
*/
module StreamReader {
/**
* A source of instances of `aiohttp.StreamReader`, extend this class to model new instances.
*
* This can include instantiations of the class, return values from function
* calls, or a special parameter that will be set when functions are called by an external
* library.
*
* Use `StreamReader::instance()` predicate to get
* references to instances of `aiohttp.StreamReader`.
*/
abstract class InstanceSource extends DataFlow::LocalSourceNode { }
/** Gets a reference to an instance of `aiohttp.StreamReader`. */
private DataFlow::TypeTrackingNode instance(DataFlow::TypeTracker t) {
t.start() and
result instanceof InstanceSource
or
exists(DataFlow::TypeTracker t2 | result = instance(t2).track(t2, t))
}
/** Gets a reference to an instance of `aiohttp.StreamReader`. */
DataFlow::Node instance() { instance(DataFlow::TypeTracker::end()).flowsTo(result) }
/**
* Taint propagation for `aiohttp.StreamReader`.
*/
private class InstanceTaintSteps extends InstanceTaintStepsHelper {
InstanceTaintSteps() { this = "aiohttp.StreamReader" }
override DataFlow::Node getInstance() { result = instance() }
override string getAttributeName() { none() }
override string getMethodName() { result = "read_nowait" }
override string getAsyncMethodName() {
result in [
"read", "readany", "readexactly", "readline", "readchunk", "iter_chunked", "iter_any",
"iter_chunks"
]
}
}
}
/**
* A parameter that will receive an `aiohttp.web.Request` instance when a request
* handler is invoked.
*/
class AiohttpRequestHandlerRequestParam extends Request::InstanceSource, RemoteFlowSource::Range,
DataFlow::ParameterNode {
AiohttpRequestHandlerRequestParam() {
exists(Function requestHandler |
requestHandler = any(AiohttpCoroutineRouteSetup setup).getARequestHandler() and
// We select the _last_ parameter for the request since that is what they do in
// `aiohttp-jinja2`.
// https://github.com/aio-libs/aiohttp-jinja2/blob/7fb4daf2c3003921d34031d38c2311ee0e02c18b/aiohttp_jinja2/__init__.py#L235
//
// I assume that is just to handle cases such as the one below
// ```py
// class MyCustomHandlerClass:
// async def foo_handler(self, request):
// ...
//
// my_custom_handler = MyCustomHandlerClass()
// app.router.add_get("/MyCustomHandlerClass/foo", my_custom_handler.foo_handler)
// ```
this.getParameter() =
max(Parameter param, int i | param = requestHandler.getArg(i) | param order by i)
)
}
override string getSourceType() { result = "aiohttp.web.Request" }
}
/**
* A read of the `request` attribute on an instance of an aiohttp.web View class,
* which is the request being processed currently.
*/
class AiohttpViewClassRequestAttributeRead extends Request::InstanceSource,
RemoteFlowSource::Range, DataFlow::Node {
AiohttpViewClassRequestAttributeRead() {
this.(DataFlow::AttrRead).getObject() = any(AiohttpViewClass vc).getASelfRef() and
this.(DataFlow::AttrRead).getAttributeName() = "request"
}
override string getSourceType() {
result = "aiohttp.web.Request from self.request in View class"
}
}
// ---------------------------------------------------------------------------
// aiohttp.web Response modeling
// ---------------------------------------------------------------------------
/**
* An instantiation of `aiohttp.web.Response`.
*
* Note that `aiohttp.web.HTTPException` (and it's subclasses) is a subclass of `aiohttp.web.Response`.
*
* See
* - https://docs.aiohttp.org/en/stable/web_reference.html#aiohttp.web.Response
* - https://docs.aiohttp.org/en/stable/web_quickstart.html#aiohttp-web-exceptions
*/
class AiohttpWebResponseInstantiation extends HTTP::Server::HttpResponse::Range,
Response::InstanceSource, DataFlow::CallCfgNode {
API::Node apiNode;
AiohttpWebResponseInstantiation() {
this = apiNode.getACall() and
(
apiNode = API::moduleImport("aiohttp").getMember("web").getMember("Response")
or
exists(string httpExceptionClassName |
httpExceptionClassName in [
"HTTPException", "HTTPSuccessful", "HTTPOk", "HTTPCreated", "HTTPAccepted",
"HTTPNonAuthoritativeInformation", "HTTPNoContent", "HTTPResetContent",
"HTTPPartialContent", "HTTPRedirection", "HTTPMultipleChoices",
"HTTPMovedPermanently", "HTTPFound", "HTTPSeeOther", "HTTPNotModified",
"HTTPUseProxy", "HTTPTemporaryRedirect", "HTTPPermanentRedirect", "HTTPError",
"HTTPClientError", "HTTPBadRequest", "HTTPUnauthorized", "HTTPPaymentRequired",
"HTTPForbidden", "HTTPNotFound", "HTTPMethodNotAllowed", "HTTPNotAcceptable",
"HTTPProxyAuthenticationRequired", "HTTPRequestTimeout", "HTTPConflict", "HTTPGone",
"HTTPLengthRequired", "HTTPPreconditionFailed", "HTTPRequestEntityTooLarge",
"HTTPRequestURITooLong", "HTTPUnsupportedMediaType", "HTTPRequestRangeNotSatisfiable",
"HTTPExpectationFailed", "HTTPMisdirectedRequest", "HTTPUnprocessableEntity",
"HTTPFailedDependency", "HTTPUpgradeRequired", "HTTPPreconditionRequired",
"HTTPTooManyRequests", "HTTPRequestHeaderFieldsTooLarge",
"HTTPUnavailableForLegalReasons", "HTTPServerError", "HTTPInternalServerError",
"HTTPNotImplemented", "HTTPBadGateway", "HTTPServiceUnavailable",
"HTTPGatewayTimeout", "HTTPVersionNotSupported", "HTTPVariantAlsoNegotiates",
"HTTPInsufficientStorage", "HTTPNotExtended", "HTTPNetworkAuthenticationRequired"
] and
apiNode = API::moduleImport("aiohttp").getMember("web").getMember(httpExceptionClassName)
)
)
}
/**
* INTERNAL: Do not use.
*
* Get the internal `API::Node` that this is call of.
*/
API::Node getApiNode() { result = apiNode }
override DataFlow::Node getBody() {
result in [this.getArgByName("text"), this.getArgByName("body")]
}
override DataFlow::Node getMimetypeOrContentTypeArg() {
result = this.getArgByName("content_type")
}
override string getMimetypeDefault() {
exists(this.getArgByName("text")) and
result = "text/plain"
or
not exists(this.getArgByName("text")) and
result = "application/octet-stream"
}
}
/** Gets an HTTP response instance. */
private API::Node aiohttpResponseInstance() {
result = any(AiohttpWebResponseInstantiation call).getApiNode().getReturn()
}
/**
* An instantiation of aiohttp.web HTTP redirect exception.
*
* See the part about redirects at https://docs.aiohttp.org/en/stable/web_quickstart.html#aiohttp-web-exceptions
*/
class AiohttpRedirectExceptionInstantiation extends AiohttpWebResponseInstantiation,
HTTP::Server::HttpRedirectResponse::Range {
AiohttpRedirectExceptionInstantiation() {
exists(string httpRedirectExceptionClassName |
httpRedirectExceptionClassName in [
"HTTPMultipleChoices", "HTTPMovedPermanently", "HTTPFound", "HTTPSeeOther",
"HTTPNotModified", "HTTPUseProxy", "HTTPTemporaryRedirect", "HTTPPermanentRedirect"
] and
this =
API::moduleImport("aiohttp")
.getMember("web")
.getMember(httpRedirectExceptionClassName)
.getACall()
)
}
override DataFlow::Node getRedirectLocation() {
result in [this.getArg(0), this.getArgByName("location")]
}
}
/**
* A call to `set_cookie` on a HTTP Response.
*/
class AiohttpResponseSetCookieCall extends HTTP::Server::CookieWrite::Range, DataFlow::CallCfgNode {
AiohttpResponseSetCookieCall() {
this = aiohttpResponseInstance().getMember("set_cookie").getACall()
}
override DataFlow::Node getHeaderArg() { none() }
override DataFlow::Node getNameArg() { result in [this.getArg(0), this.getArgByName("name")] }
override DataFlow::Node getValueArg() { result in [this.getArg(1), this.getArgByName("value")] }
}
/**
* A call to `del_cookie` on a HTTP Response.
*/
class AiohttpResponseDelCookieCall extends HTTP::Server::CookieWrite::Range, DataFlow::CallCfgNode {
AiohttpResponseDelCookieCall() {
this = aiohttpResponseInstance().getMember("del_cookie").getACall()
}
override DataFlow::Node getHeaderArg() { none() }
override DataFlow::Node getNameArg() { result in [this.getArg(0), this.getArgByName("name")] }
override DataFlow::Node getValueArg() { none() }
}
/**
* A dict-like write to an item of the `cookies` attribute on a HTTP response, such as
* `response.cookies[name] = value`.
*/
class AiohttpResponseCookieSubscriptWrite extends HTTP::Server::CookieWrite::Range {
DataFlow::Node index;
DataFlow::Node value;
AiohttpResponseCookieSubscriptWrite() {
exists(SubscriptNode subscript |
// To give `this` a value, we need to choose between either LHS or RHS,
// and just go with the LHS
this.asCfgNode() = subscript
|
subscript.getObject() = aiohttpResponseInstance().getMember("cookies").getAUse().asCfgNode() and
value.asCfgNode() = subscript.(DefinitionNode).getValue() and
index.asCfgNode() = subscript.getIndex()
)
}
override DataFlow::Node getHeaderArg() { none() }
override DataFlow::Node getNameArg() { result = index }
override DataFlow::Node getValueArg() { result = value }
}
}