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writer.go
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writer.go
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package report
import (
"bytes"
"encoding/json"
"encoding/xml"
"fmt"
"html"
"io"
"io/ioutil"
"os"
"regexp"
"strings"
"text/template"
"time"
"github.com/Masterminds/sprig"
"github.com/olekukonko/tablewriter"
"golang.org/x/xerrors"
"github.com/aquasecurity/fanal/analyzer/library"
ftypes "github.com/aquasecurity/fanal/types"
dbTypes "github.com/aquasecurity/trivy-db/pkg/types"
"github.com/aquasecurity/trivy-db/pkg/vulnsrc/vulnerability"
"github.com/aquasecurity/trivy/pkg/types"
"github.com/aquasecurity/trivy/pkg/utils"
)
// Now returns the current time
var Now = time.Now
// regex to extract file path in case string includes (distro:version)
var re = regexp.MustCompile(`(?P<path>.+?)(?:\s*\((?:.*?)\).*?)?$`)
// Results to hold list of Result
type Results []Result
// Result to hold image scan results
type Result struct {
Target string `json:"Target"`
Type string `json:"Type,omitempty"`
Packages []ftypes.Package `json:"Packages,omitempty"`
Vulnerabilities []types.DetectedVulnerability `json:"Vulnerabilities"`
}
// WriteResults writes the result to output, format as passed in argument
func WriteResults(format string, output io.Writer, severities []dbTypes.Severity, results Results, outputTemplate string, light bool) error {
var writer Writer
switch format {
case "table":
writer = &TableWriter{Output: output, Light: light, Severities: severities}
case "json":
writer = &JSONWriter{Output: output}
case "template":
var err error
if writer, err = NewTemplateWriter(output, outputTemplate); err != nil {
return xerrors.Errorf("failed to initialize template writer: %w", err)
}
default:
return xerrors.Errorf("unknown format: %v", format)
}
if err := writer.Write(results); err != nil {
return xerrors.Errorf("failed to write results: %w", err)
}
return nil
}
// Writer defines the result write operation
type Writer interface {
Write(Results) error
}
// TableWriter implements Writer and output in tabular form
type TableWriter struct {
Severities []dbTypes.Severity
Output io.Writer
Light bool
}
// Write writes the result on standard output
func (tw TableWriter) Write(results Results) error {
for _, result := range results {
// Skip zero vulnerabilities on Java archives (JAR/WAR/EAR)
if result.Type == library.Jar && len(result.Vulnerabilities) == 0 {
continue
}
tw.write(result)
}
return nil
}
func (tw TableWriter) write(result Result) {
table := tablewriter.NewWriter(tw.Output)
header := []string{"Library", "Vulnerability ID", "Severity", "Installed Version", "Fixed Version"}
if !tw.Light {
header = append(header, "Title")
}
table.SetHeader(header)
severityCount := tw.setRows(table, result.Vulnerabilities)
var results []string
var severities []string
for _, sev := range tw.Severities {
severities = append(severities, sev.String())
}
for _, severity := range dbTypes.SeverityNames {
if !utils.StringInSlice(severity, severities) {
continue
}
r := fmt.Sprintf("%s: %d", severity, severityCount[severity])
results = append(results, r)
}
fmt.Printf("\n%s\n", result.Target)
fmt.Println(strings.Repeat("=", len(result.Target)))
fmt.Printf("Total: %d (%s)\n\n", len(result.Vulnerabilities), strings.Join(results, ", "))
if len(result.Vulnerabilities) == 0 {
return
}
table.SetAutoMergeCells(true)
table.SetRowLine(true)
table.Render()
return
}
func (tw TableWriter) setRows(table *tablewriter.Table, vulns []types.DetectedVulnerability) map[string]int {
severityCount := map[string]int{}
for _, v := range vulns {
severityCount[v.Severity]++
title := v.Title
if title == "" {
title = v.Description
}
splitTitle := strings.Split(title, " ")
if len(splitTitle) >= 12 {
title = strings.Join(splitTitle[:12], " ") + "..."
}
if len(v.PrimaryURL) > 0 {
r := strings.NewReplacer("https://", "", "http://", "")
title = fmt.Sprintf("%s -->%s", title, r.Replace(v.PrimaryURL))
}
var row []string
if tw.Output == os.Stdout {
row = []string{v.PkgName, v.VulnerabilityID, dbTypes.ColorizeSeverity(v.Severity),
v.InstalledVersion, v.FixedVersion}
} else {
row = []string{v.PkgName, v.VulnerabilityID, v.Severity, v.InstalledVersion, v.FixedVersion}
}
if !tw.Light {
row = append(row, strings.TrimSpace(title))
}
table.Append(row)
}
return severityCount
}
// JSONWriter implements result Writer
type JSONWriter struct {
Output io.Writer
}
// Write writes the results in JSON format
func (jw JSONWriter) Write(results Results) error {
output, err := json.MarshalIndent(results, "", " ")
if err != nil {
return xerrors.Errorf("failed to marshal json: %w", err)
}
if _, err = fmt.Fprint(jw.Output, string(output)); err != nil {
return xerrors.Errorf("failed to write json: %w", err)
}
return nil
}
// TemplateWriter write result in custom format defined by user's template
type TemplateWriter struct {
Output io.Writer
Template *template.Template
}
// NewTemplateWriter is the factory method to return TemplateWriter object
func NewTemplateWriter(output io.Writer, outputTemplate string) (*TemplateWriter, error) {
if strings.HasPrefix(outputTemplate, "@") {
buf, err := ioutil.ReadFile(strings.TrimPrefix(outputTemplate, "@"))
if err != nil {
return nil, xerrors.Errorf("error retrieving template from path: %w", err)
}
outputTemplate = string(buf)
}
var templateFuncMap template.FuncMap
templateFuncMap = sprig.GenericFuncMap()
templateFuncMap["escapeXML"] = func(input string) string {
escaped := &bytes.Buffer{}
if err := xml.EscapeText(escaped, []byte(input)); err != nil {
fmt.Printf("error while escapeString to XML: %v", err.Error())
return input
}
return escaped.String()
}
templateFuncMap["toSarifErrorLevel"] = toSarifErrorLevel
templateFuncMap["toSarifRuleName"] = toSarifRuleName
templateFuncMap["endWithPeriod"] = func(input string) string {
if !strings.HasSuffix(input, ".") {
input += "."
}
return input
}
templateFuncMap["toLower"] = func(input string) string {
return strings.ToLower(input)
}
templateFuncMap["escapeString"] = func(input string) string {
return html.EscapeString(input)
}
templateFuncMap["toPathUri"] = func(input string) string {
var matches = re.FindStringSubmatch(input)
if matches != nil {
input = matches[re.SubexpIndex("path")]
}
input = strings.ReplaceAll(input, "\\", "/")
return input
}
templateFuncMap["getEnv"] = func(key string) string {
return os.Getenv(key)
}
templateFuncMap["getCurrentTime"] = func() string {
return Now().UTC().Format(time.RFC3339Nano)
}
tmpl, err := template.New("output template").Funcs(templateFuncMap).Parse(outputTemplate)
if err != nil {
return nil, xerrors.Errorf("error parsing template: %w", err)
}
return &TemplateWriter{Output: output, Template: tmpl}, nil
}
// Write writes result
func (tw TemplateWriter) Write(results Results) error {
err := tw.Template.Execute(tw.Output, results)
if err != nil {
return xerrors.Errorf("failed to write with template: %w", err)
}
return nil
}
func toSarifRuleName(vulnerabilityType string) string {
var ruleName string
switch vulnerabilityType {
case vulnerability.Ubuntu, vulnerability.Alpine, vulnerability.RedHat, vulnerability.RedHatOVAL,
vulnerability.Debian, vulnerability.DebianOVAL, vulnerability.Fedora, vulnerability.Amazon,
vulnerability.OracleOVAL, vulnerability.SuseCVRF, vulnerability.OpenSuseCVRF, vulnerability.Photon,
vulnerability.CentOS:
ruleName = "OS Package Vulnerability"
case "npm", "yarn", "nuget", "pipenv", "poetry", "bundler", "cargo", "composer":
ruleName = "Programming Language Vulnerability"
default:
ruleName = "Other Vulnerability"
}
return fmt.Sprintf("%s (%s)", ruleName, strings.Title(vulnerabilityType))
}
func toSarifErrorLevel(severity string) string {
switch severity {
case "CRITICAL", "HIGH":
return "error"
case "MEDIUM":
return "warning"
case "LOW", "UNKNOWN":
return "note"
default:
return "none"
}
}