vulncheck: introduce vulncheck module and core structures
Change-Id: I66c2153bb466db0122d71d4c772ba38496fc740f
Reviewed-on: https://go-review.googlesource.com/c/exp/+/358634
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Trust: Zvonimir Pavlinovic <zpavlinovic@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
diff --git a/vulncheck/go.mod b/vulncheck/go.mod
new file mode 100644
index 0000000..de7dce9
--- /dev/null
+++ b/vulncheck/go.mod
@@ -0,0 +1,10 @@
+module golang.org/x/exp/vulncheck
+
+go 1.17
+
+require golang.org/x/vulndb v0.0.0-20211020161650-d192a0cd6149
+
+require (
+ golang.org/x/mod v0.4.1 // indirect
+ golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 // indirect
+)
diff --git a/vulncheck/go.sum b/vulncheck/go.sum
new file mode 100644
index 0000000..4d817b1
--- /dev/null
+++ b/vulncheck/go.sum
@@ -0,0 +1,89 @@
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diff --git a/vulncheck/vulncheck.go b/vulncheck/vulncheck.go
new file mode 100644
index 0000000..4d8cc90
--- /dev/null
+++ b/vulncheck/vulncheck.go
@@ -0,0 +1,150 @@
+// 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 detects uses of known vulnerabilities
+// in Go binaries and source code.
+package vulncheck
+
+import (
+ "go/token"
+
+ "golang.org/x/vulndb/client"
+ "golang.org/x/vulndb/osv"
+)
+
+// Config is used for configuring vulncheck algorithms.
+type Config struct {
+ // ImportsOnly flag, if true, signals vulncheck to analyze import chains only.
+ // Otherwise, call chains are analyzed too.
+ ImportsOnly bool
+ // Client is used for querying data from a vulnerability database.
+ Client client.Client
+}
+
+// Result contains information on which vulnerabilities are potentially affecting
+// user code and how are they affecting it via call graph, package imports graph,
+// and module requires graph.
+type Result struct {
+ // Calls is a call graph whose roots are program entry functions/methods and
+ // sinks are vulnerable functions/methods. Empty when Config.ImportsOnly=true
+ // or when no vulnerable symbols are reachable via program call graph.
+ Calls *CallGraph
+ // Imports is a package dependency graph whose roots are entry user packages
+ // and sinks are the packages with some vulnerable symbols. Empty when no
+ // packages with some vulnerabilities are imported in the program.
+ Imports *ImportGraph
+ // Requires is a module dependency graph whose roots are entry user modules
+ // and sinks are modules with some vulnerable packages. Empty when no modules
+ // with some vulnerabilities are required by the program.
+ Requires *RequireGraph
+
+ // Vulns contains information on detected vulnerabilities and their place in
+ // the above graphs. Only vulnerabilities whose symbols are reachable in Calls,
+ // or whose packages are imported in Imports, or whose modules are required in
+ // Requires, have an entry in Vulns.
+ Vulns []*Vuln
+}
+
+// Vuln provides information on how a vulnerability is affecting user code by
+// connecting it to the Result.{Calls,Imports,Requires} graphs. Vulnerabilities
+// detected in Go binaries do not have a place in the Result graphs.
+type Vuln struct {
+ // The next four fields identify a vulnerability. Note that *osv.Entry
+ // describes potentially multiple symbols from multiple packages.
+
+ // OSV contains information on detected vulnerability in the shared
+ // vulnerability format.
+ OSV *osv.Entry
+ // Symbol is the name of the detected vulnerable function or method.
+ Symbol string
+ // PkgPath is the package path of the detected Symbol.
+ PkgPath string
+ // ModPath is the module path corresponding to PkgPath.
+ ModPath string
+
+ // CallSink is the ID of the sink node in Calls graph corresponding to
+ // the use of Symbol. ID is not available (denoted with 0) in binary mode,
+ // or if Symbol is not reachable, or if Config.ImportsOnly=true.
+ CallSink int
+ // ImportSink is the ID of the sink node in the Imports graph corresponding
+ // to the import of PkgPath. ID is not available (denoted with 0) in binary
+ // mode or if PkgPath is not imported.
+ ImportSink int
+ // RequireSink is the ID of the sink node in Requires graph corresponding
+ // to the require statement of ModPath. ID is not available (denoted with 0)
+ // in binary mode.
+ RequireSink int
+}
+
+// CallGraph whose sinks are vulnerable functions and sources are entry points of user
+// packages. CallGraph is backwards directed, i.e., from a function node to the place
+// where the function is called.
+type CallGraph struct {
+ // Funcs contains all call graph nodes as a map: func node id -> func node.
+ Funcs map[int]*FuncNode
+ // Entries are a subset of Funcs representing vulncheck entry points.
+ Entries []*FuncNode
+}
+
+type FuncNode struct {
+ ID int
+ Name string
+ // RecvType is the receiver object type of this function, if any.
+ RecvType string
+ PkgPath string
+ Pos *token.Position
+ // CallSites is a set of call sites where this function is called.
+ CallSites []*CallSite
+}
+
+type CallSite struct {
+ // Parent is ID of the enclosing function where the call is made.
+ Parent int
+ // Name stands for the name of the function (variable) being called.
+ Name string
+ // RecvType is the full path of the receiver object type, if any.
+ RecvType string
+ Pos *token.Position
+ // Resolved indicates if the called function can be statically resolved.
+ Resolved bool
+}
+
+// RequireGraph models part of module requires graph where sinks are modules with
+// some known vulnerabilities and sources are modules of user entry packages.
+// RequireGraph is backwards directed, i.e., from a module to the set of modules
+// it is required by.
+type RequireGraph struct {
+ // Modules contains all module nodes as a map: module node id -> module node.
+ Modules map[int]*ModNode
+ // Entries are a subset of Modules representing modules of vulncheck entry points.
+ Entries []*ModNode
+}
+
+type ModNode struct {
+ Path string
+ Version string
+ Replace *ModNode
+ // RequiredBy contains IDs of the modules requiring this module.
+ RequiredBy []int
+}
+
+// ImportGraph models part of package import graph where sinks are packages with
+// some known vulnerabilities and sources are user specified packages. The graph
+// is backwards directed, i.e., from a package to the set of packages importing it.
+type ImportGraph struct {
+ // Packages contains all package nodes as a map: package node id -> package node.
+ Packages map[int]*PkgNode
+ // Entries are a subset of Packages representing packages of vulncheck entry points.
+ Entries []*PkgNode
+}
+
+type PkgNode struct {
+ // Name is the package identifier as it appears in the source code.
+ Name string
+ Path string
+ // Module holds ID of the corresponding module (node) in Requires graph.
+ Module int
+ // ImportedBy contains IDs of packages directly importing this package.
+ ImportedBy []int
+}
