replace dummy matcher with os matcher

vulnscan/matcher/controller.go

@@ -1,11 +1,12 @@
 package matcher
 
 import (
+	imgbomOS "github.com/anchore/imgbom/imgbom/os"
 	"github.com/anchore/imgbom/imgbom/pkg"
 	"github.com/anchore/vulnscan/internal/log"
-	"github.com/anchore/vulnscan/vulnscan/match"
-	"github.com/anchore/vulnscan/vulnscan/matcher/dummy"
+	"github.com/anchore/vulnscan/vulnscan/matcher/os"
 	"github.com/anchore/vulnscan/vulnscan/result"
+	"github.com/anchore/vulnscan/vulnscan/vulnerability"
 )
 
 var controllerInstance controller
@@ -14,7 +15,7 @@ func init() {
 	controllerInstance = controller{
 		matchers: make(map[pkg.Type][]Matcher),
 	}
-	controllerInstance.add(&dummy.Matcher{})
+	controllerInstance.add(&os.Matcher{})
 }
 
 type controller struct {
@@ -23,28 +24,34 @@ type controller struct {
 
 func (c *controller) add(matchers ...Matcher) {
 	for _, m := range matchers {
-		if _, ok := c.matchers[m.Type()]; ok {
-			c.matchers[m.Type()] = make([]Matcher, 0)
-		}
+		for _, t := range m.Types() {
+			if _, ok := c.matchers[t]; ok {
+				c.matchers[t] = make([]Matcher, 0)
+			}
 
-		c.matchers[m.Type()] = append(c.matchers[m.Type()], m)
-		log.Debugf("adding matcher: %+v", m.Type())
+			c.matchers[t] = append(c.matchers[t], m)
+			log.Debugf("adding matcher: %+v", t)
+		}
 	}
 }
 
-// TODO: do we need to pass the entire store? or just a reader interface subset?
-func (c *controller) findMatches(s match.Store, packages ...pkg.Package) result.Result {
+func (c *controller) findMatches(s vulnerability.Provider, o imgbomOS.OS, packages ...*pkg.Package) result.Result {
 	res := result.NewResult()
 	for _, p := range packages {
 		for _, matchers := range c.matchers {
 			for _, m := range matchers {
-				res.Add(p, m.Match(s, p)...)
+				matches, err := m.Match(s, o, p)
+				if err != nil {
+					log.Errorf("matcher failed for pkg=%s: %w", p, err)
+				} else {
+					res.Add(p, matches...)
+				}
 			}
 		}
 	}
 	return res
 }
 
-func FindMatches(s match.Store, packages ...pkg.Package) result.Result {
-	return controllerInstance.findMatches(s, packages...)
+func FindMatches(s vulnerability.Provider, o imgbomOS.OS, packages ...*pkg.Package) result.Result {
+	return controllerInstance.findMatches(s, o, packages...)
 }

vulnscan/matcher/dummy/matcher.go

@@ -1,27 +0,0 @@
-package dummy
-
-import (
-	"github.com/anchore/imgbom/imgbom/pkg"
-	"github.com/anchore/vulnscan-db/pkg/vulnerability"
-	"github.com/anchore/vulnscan/vulnscan/match"
-)
-
-// TODO: delete me...
-
-type Matcher struct {
-}
-
-func (m *Matcher) Type() pkg.Type {
-	return pkg.DebPkg
-}
-
-func (m *Matcher) Match(match.Store, pkg.Package) []match.Match {
-	return []match.Match{
-		{
-			Confidence:    42,
-			Vulnerability: vulnerability.Vulnerability{},
-			Package:       pkg.Package{},
-			SearchKey:     "the key",
-		},
-	}
-}

vulnscan/matcher/os/matcher.go

@@ -0,0 +1,61 @@
+package os
+
+import (
+	"fmt"
+
+	"github.com/anchore/imgbom/imgbom/os"
+	"github.com/anchore/imgbom/imgbom/pkg"
+	"github.com/anchore/vulnscan/vulnscan/match"
+	"github.com/anchore/vulnscan/vulnscan/version"
+	"github.com/anchore/vulnscan/vulnscan/vulnerability"
+)
+
+// TODO: consider renaming this package to DISTRO for easier importing...
+
+type Matcher struct {
+}
+
+func (m *Matcher) Types() []pkg.Type {
+	return []pkg.Type{pkg.DebPkg}
+}
+
+func (m *Matcher) Match(store vulnerability.Provider, o os.OS, p *pkg.Package) ([]match.Match, error) {
+	// TODO: add other kinds of matches? fuzzy matches, etc...
+	return m.exactPackageNameMatch(store, o, p)
+}
+
+func (m *Matcher) exactPackageNameMatch(store vulnerability.Provider, o os.OS, p *pkg.Package) ([]match.Match, error) {
+
+	matches := make([]match.Match, 0)
+
+	// TODO: there should be a vulnerability object in the vulnscan-db/db/vulnerability for mondel serialization and one here in vulnerability for rich objects
+
+	allPkgVulns, err := store.GetByOs(o, p)
+	if err != nil {
+		return nil, fmt.Errorf("matcher failed to fetch os=%s pkg=%s: %w", o, p.Name, err)
+	}
+
+	verObj, err := version.NewVersionFromPkg(p)
+	if err != nil {
+		return nil, fmt.Errorf("matcher failed to parse version pkg=%s ver=%s: %w", p.Name, p.Version, err)
+	}
+
+	for _, vuln := range allPkgVulns {
+		// if the constraint it met, then the given package has the vulnerability
+		satisfied, err := vuln.Constraint.Satisfied(verObj)
+		if err != nil {
+			// TODO: not enough information (cannot back track constraint object)
+			return nil, fmt.Errorf("matcher failed to check constraint=%s version=%s: %w", vuln.Constraint, verObj, err)
+		}
+
+		if satisfied {
+			matches = append(matches, match.Match{
+				Confidence:    1.0, // TODO: this is hard coded for now
+				Vulnerability: *vuln,
+				Package:       p,
+				SearchKey:     fmt.Sprintf("%s:%s", p.Name, p.Version), // TODO: better way to signify exact match?
+			})
+		}
+	}
+	return matches, nil
+}