Initialize module and dependencies
This commit is contained in:
dwrz
312
vendor/golang.org/x/vuln/internal/vulncheck/source.go
generated
vendored
Normal file
312
vendor/golang.org/x/vuln/internal/vulncheck/source.go
generated
vendored
Normal file
@@ -0,0 +1,312 @@
|
||||
// Copyright 2021 The Go Authors. All rights reserved.
|
||||
// Use of this source code is governed by a BSD-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package vulncheck
|
||||
|
||||
import (
|
||||
"context"
|
||||
"sync"
|
||||
|
||||
"golang.org/x/tools/go/callgraph"
|
||||
"golang.org/x/tools/go/packages"
|
||||
"golang.org/x/tools/go/ssa"
|
||||
"golang.org/x/vuln/internal/client"
|
||||
"golang.org/x/vuln/internal/govulncheck"
|
||||
"golang.org/x/vuln/internal/osv"
|
||||
)
|
||||
|
||||
// Source detects vulnerabilities in pkgs and emits the findings to handler.
|
||||
func Source(ctx context.Context, handler govulncheck.Handler, cfg *govulncheck.Config, client *client.Client, graph *PackageGraph) error {
|
||||
vr, err := source(ctx, handler, cfg, client, graph)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
if cfg.ScanLevel.WantSymbols() {
|
||||
return emitCallFindings(handler, sourceCallstacks(vr))
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
// source detects vulnerabilities in packages. It emits findings to handler
|
||||
// and produces a Result that contains info on detected vulnerabilities.
|
||||
//
|
||||
// Assumes that pkgs are non-empty and belong to the same program.
|
||||
func source(ctx context.Context, handler govulncheck.Handler, cfg *govulncheck.Config, client *client.Client, graph *PackageGraph) (*Result, error) {
|
||||
ctx, cancel := context.WithCancel(ctx)
|
||||
defer cancel()
|
||||
|
||||
// If we are building the callgraph, build ssa and the callgraph in parallel
|
||||
// with fetching vulnerabilities. If the vulns set is empty, return without
|
||||
// waiting for SSA construction or callgraph to finish.
|
||||
var (
|
||||
wg sync.WaitGroup // guards entries, cg, and buildErr
|
||||
entries []*ssa.Function
|
||||
cg *callgraph.Graph
|
||||
buildErr error
|
||||
)
|
||||
if cfg.ScanLevel.WantSymbols() {
|
||||
fset := graph.TopPkgs()[0].Fset
|
||||
wg.Add(1)
|
||||
go func() {
|
||||
defer wg.Done()
|
||||
prog, ssaPkgs := buildSSA(graph.TopPkgs(), fset)
|
||||
entries = entryPoints(ssaPkgs)
|
||||
cg, buildErr = callGraph(ctx, prog, entries)
|
||||
}()
|
||||
}
|
||||
|
||||
if err := handler.SBOM(graph.SBOM()); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if err := handler.Progress(&govulncheck.Progress{Message: fetchingVulnsMessage}); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
mv, err := FetchVulnerabilities(ctx, client, graph.Modules())
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Emit OSV entries immediately in their raw unfiltered form.
|
||||
if err := emitOSVs(handler, mv); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if err := handler.Progress(&govulncheck.Progress{Message: checkingSrcVulnsMessage}); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
affVulns := affectingVulnerabilities(mv, "", "")
|
||||
if err := emitModuleFindings(handler, affVulns); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if !cfg.ScanLevel.WantPackages() || len(affVulns) == 0 {
|
||||
return &Result{}, nil
|
||||
}
|
||||
|
||||
impVulns := importedVulnPackages(affVulns, graph)
|
||||
// Emit information on imported vulnerable packages now as
|
||||
// call graph computation might take a while.
|
||||
if err := emitPackageFindings(handler, impVulns); err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
// Return result immediately if not in symbol mode or
|
||||
// if there are no vulnerabilities imported.
|
||||
if !cfg.ScanLevel.WantSymbols() || len(impVulns) == 0 {
|
||||
return &Result{Vulns: impVulns}, nil
|
||||
}
|
||||
|
||||
wg.Wait() // wait for build to finish
|
||||
if buildErr != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
entryFuncs, callVulns := calledVulnSymbols(entries, affVulns, cg, graph)
|
||||
return &Result{EntryFunctions: entryFuncs, Vulns: callVulns}, nil
|
||||
}
|
||||
|
||||
// importedVulnPackages detects imported vulnerable packages.
|
||||
func importedVulnPackages(affVulns affectingVulns, graph *PackageGraph) []*Vuln {
|
||||
var vulns []*Vuln
|
||||
analyzed := make(map[*packages.Package]bool) // skip analyzing the same package multiple times
|
||||
var vulnImports func(pkg *packages.Package)
|
||||
vulnImports = func(pkg *packages.Package) {
|
||||
if analyzed[pkg] {
|
||||
return
|
||||
}
|
||||
|
||||
osvs := affVulns.ForPackage(pkgModPath(pkg), pkg.PkgPath)
|
||||
// Create Vuln entry for each OSV entry for pkg.
|
||||
for _, osv := range osvs {
|
||||
vuln := &Vuln{
|
||||
OSV: osv,
|
||||
Package: graph.GetPackage(pkg.PkgPath),
|
||||
}
|
||||
vulns = append(vulns, vuln)
|
||||
}
|
||||
|
||||
analyzed[pkg] = true
|
||||
for _, imp := range pkg.Imports {
|
||||
vulnImports(imp)
|
||||
}
|
||||
}
|
||||
|
||||
for _, pkg := range graph.TopPkgs() {
|
||||
vulnImports(pkg)
|
||||
}
|
||||
return vulns
|
||||
}
|
||||
|
||||
// calledVulnSymbols detects vuln symbols transitively reachable from sources
|
||||
// via call graph cg.
|
||||
//
|
||||
// A slice of call graph is computed related to the reachable vulnerabilities. Each
|
||||
// reachable Vuln has attached FuncNode that can be upward traversed to the entry points.
|
||||
// Entry points that reach the vulnerable symbols are also returned.
|
||||
func calledVulnSymbols(sources []*ssa.Function, affVulns affectingVulns, cg *callgraph.Graph, graph *PackageGraph) ([]*FuncNode, []*Vuln) {
|
||||
sinksWithVulns := vulnFuncs(cg, affVulns, graph)
|
||||
|
||||
// Compute call graph backwards reachable
|
||||
// from vulnerable functions and methods.
|
||||
var sinks []*callgraph.Node
|
||||
for n := range sinksWithVulns {
|
||||
sinks = append(sinks, n)
|
||||
}
|
||||
bcg := callGraphSlice(sinks, false)
|
||||
|
||||
// Interesect backwards call graph with forward
|
||||
// reachable graph to remove redundant edges.
|
||||
var filteredSources []*callgraph.Node
|
||||
for _, e := range sources {
|
||||
if n, ok := bcg.Nodes[e]; ok {
|
||||
filteredSources = append(filteredSources, n)
|
||||
}
|
||||
}
|
||||
fcg := callGraphSlice(filteredSources, true)
|
||||
|
||||
// Get the sinks that are in fact reachable from entry points.
|
||||
filteredSinks := make(map[*callgraph.Node][]*osv.Entry)
|
||||
for n, vs := range sinksWithVulns {
|
||||
if fn, ok := fcg.Nodes[n.Func]; ok {
|
||||
filteredSinks[fn] = vs
|
||||
}
|
||||
}
|
||||
|
||||
// Transform the resulting call graph slice into
|
||||
// vulncheck representation.
|
||||
return vulnCallGraph(filteredSources, filteredSinks, graph)
|
||||
}
|
||||
|
||||
// callGraphSlice computes a slice of callgraph beginning at starts
|
||||
// in the direction (forward/backward) controlled by forward flag.
|
||||
func callGraphSlice(starts []*callgraph.Node, forward bool) *callgraph.Graph {
|
||||
g := &callgraph.Graph{Nodes: make(map[*ssa.Function]*callgraph.Node)}
|
||||
|
||||
visited := make(map[*callgraph.Node]bool)
|
||||
var visit func(*callgraph.Node)
|
||||
visit = func(n *callgraph.Node) {
|
||||
if visited[n] {
|
||||
return
|
||||
}
|
||||
visited[n] = true
|
||||
|
||||
var edges []*callgraph.Edge
|
||||
if forward {
|
||||
edges = n.Out
|
||||
} else {
|
||||
edges = n.In
|
||||
}
|
||||
|
||||
for _, edge := range edges {
|
||||
nCallee := g.CreateNode(edge.Callee.Func)
|
||||
nCaller := g.CreateNode(edge.Caller.Func)
|
||||
callgraph.AddEdge(nCaller, edge.Site, nCallee)
|
||||
|
||||
if forward {
|
||||
visit(edge.Callee)
|
||||
} else {
|
||||
visit(edge.Caller)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
for _, s := range starts {
|
||||
visit(s)
|
||||
}
|
||||
return g
|
||||
}
|
||||
|
||||
// vulnCallGraph creates vulnerability call graph in terms of sources and sinks.
|
||||
func vulnCallGraph(sources []*callgraph.Node, sinks map[*callgraph.Node][]*osv.Entry, graph *PackageGraph) ([]*FuncNode, []*Vuln) {
|
||||
var entries []*FuncNode
|
||||
var vulns []*Vuln
|
||||
nodes := make(map[*ssa.Function]*FuncNode)
|
||||
|
||||
// First create entries and sinks and store relevant information.
|
||||
for _, s := range sources {
|
||||
fn := createNode(nodes, s.Func, graph)
|
||||
entries = append(entries, fn)
|
||||
}
|
||||
|
||||
for s, osvs := range sinks {
|
||||
f := s.Func
|
||||
funNode := createNode(nodes, s.Func, graph)
|
||||
|
||||
// Populate CallSink field for each detected vuln symbol.
|
||||
for _, osv := range osvs {
|
||||
vulns = append(vulns, calledVuln(funNode, osv, dbFuncName(f), funNode.Package))
|
||||
}
|
||||
}
|
||||
|
||||
visited := make(map[*callgraph.Node]bool)
|
||||
var visit func(*callgraph.Node)
|
||||
visit = func(n *callgraph.Node) {
|
||||
if visited[n] {
|
||||
return
|
||||
}
|
||||
visited[n] = true
|
||||
|
||||
for _, edge := range n.In {
|
||||
nCallee := createNode(nodes, edge.Callee.Func, graph)
|
||||
nCaller := createNode(nodes, edge.Caller.Func, graph)
|
||||
|
||||
call := edge.Site
|
||||
cs := &CallSite{
|
||||
Parent: nCaller,
|
||||
Name: call.Common().Value.Name(),
|
||||
RecvType: callRecvType(call),
|
||||
Resolved: resolved(call),
|
||||
Pos: instrPosition(call),
|
||||
}
|
||||
nCallee.CallSites = append(nCallee.CallSites, cs)
|
||||
|
||||
visit(edge.Caller)
|
||||
}
|
||||
}
|
||||
|
||||
for s := range sinks {
|
||||
visit(s)
|
||||
}
|
||||
return entries, vulns
|
||||
}
|
||||
|
||||
// vulnFuncs returns vulnerability information for vulnerable functions in cg.
|
||||
func vulnFuncs(cg *callgraph.Graph, affVulns affectingVulns, graph *PackageGraph) map[*callgraph.Node][]*osv.Entry {
|
||||
m := make(map[*callgraph.Node][]*osv.Entry)
|
||||
for f, n := range cg.Nodes {
|
||||
p := pkgPath(f)
|
||||
vulns := affVulns.ForSymbol(pkgModPath(graph.GetPackage(p)), p, dbFuncName(f))
|
||||
if len(vulns) > 0 {
|
||||
m[n] = vulns
|
||||
}
|
||||
}
|
||||
return m
|
||||
}
|
||||
|
||||
func createNode(nodes map[*ssa.Function]*FuncNode, f *ssa.Function, graph *PackageGraph) *FuncNode {
|
||||
if fn, ok := nodes[f]; ok {
|
||||
return fn
|
||||
}
|
||||
fn := &FuncNode{
|
||||
Name: f.Name(),
|
||||
Package: graph.GetPackage(pkgPath(f)),
|
||||
RecvType: funcRecvType(f),
|
||||
Pos: funcPosition(f),
|
||||
}
|
||||
nodes[f] = fn
|
||||
return fn
|
||||
}
|
||||
|
||||
func calledVuln(call *FuncNode, osv *osv.Entry, symbol string, pkg *packages.Package) *Vuln {
|
||||
return &Vuln{
|
||||
Symbol: symbol,
|
||||
Package: pkg,
|
||||
OSV: osv,
|
||||
CallSink: call,
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user