/
linter.go
207 lines (191 loc) · 4.89 KB
/
linter.go
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package internal
import (
"encoding/json"
"fmt"
"github.com/fatih/color"
"github.com/mprpic/cvelint/internal/rules"
"github.com/tidwall/gjson"
"log"
"os"
"sort"
"strconv"
"strings"
"sync"
"sync/atomic"
"time"
)
type Linter struct {
Timestamp time.Time
FileInput *[]string
FilesChecked int
Results []LintResult
GenericErrors []string
}
type LintResult struct {
File string
CveId string
Cna string
Error rules.ValidationError
Rule
}
func (l *Linter) Run(selectedRules *[]Rule, cna string) {
var checkedFiles int64
lintResultsChan := make(chan LintResult)
genErrorChan := make(chan string)
var wg sync.WaitGroup
for _, file := range *l.FileInput {
wg.Add(1)
go func(file string) {
defer wg.Done()
cveId := strings.TrimSuffix(file[strings.LastIndex(file, "/")+1:], ".json")
content, err := os.ReadFile(file)
if err != nil {
genErrorChan <- "Could not read file: " + file
return
}
// Convert to string because gjson.Result.Path does not accept []byte
jsonText := string(content)
if !gjson.Valid(jsonText) {
genErrorChan <- "File contains invalid JSON: " + file
return
}
recordCna := gjson.Get(jsonText, "cveMetadata.assignerShortName").String()
if recordCna == "" {
// Not a CVE v5 JSON record, skip.
return
}
if cna != "" && cna != recordCna {
return
}
for _, rule := range *selectedRules {
errors := rule.CheckFunc(&jsonText)
for _, e := range errors {
lintResultsChan <- LintResult{
File: file,
CveId: cveId,
Cna: recordCna,
Error: e,
Rule: rule,
}
}
}
atomic.AddInt64(&checkedFiles, 1)
fmt.Fprintf(os.Stderr, "\rProcessed %d CVE records...", atomic.LoadInt64(&checkedFiles))
}(file)
}
go func() {
wg.Wait()
close(genErrorChan)
close(lintResultsChan)
}()
// Collect errors and lint results from both channels until they are empty.
for {
select {
case lintResult, ok := <-lintResultsChan:
if !ok {
lintResultsChan = nil
} else {
l.Results = append(l.Results, lintResult)
}
case genErr, ok := <-genErrorChan:
if !ok {
genErrorChan = nil
} else {
l.GenericErrors = append(l.GenericErrors, genErr)
}
}
if lintResultsChan == nil && genErrorChan == nil {
break
}
}
sort.Slice(l.Results, func(i, j int) bool {
// Sort results alphanumerically by CVE ID (starting from newest)
a := strings.Split(l.Results[i].CveId, "-") // CVE-2020-0001 -> [CVE 2020 0001]
b := strings.Split(l.Results[j].CveId, "-")
i, _ = strconv.Atoi(strings.Join(a[1:], "")) // 20200001
j, _ = strconv.Atoi(strings.Join(b[1:], ""))
return i > j
})
fmt.Fprintf(os.Stderr, "\r\033[K")
l.FilesChecked = int(atomic.LoadInt64(&checkedFiles))
}
func (l *Linter) Print(format string) {
switch format {
case "text":
fmt.Printf("")
fmt.Printf("Collected %d file", len(*l.FileInput))
if len(*l.FileInput) != 1 {
fmt.Print("s")
}
fmt.Printf("; checked %d file", l.FilesChecked)
if l.FilesChecked != 1 {
fmt.Println("s.")
} else {
fmt.Println(".")
}
if len(l.GenericErrors) > 0 {
fmt.Println()
for _, e := range l.GenericErrors {
fmt.Printf("ERROR: %s", e)
}
fmt.Println()
}
bold := color.New(color.Bold).Add(color.Underline)
red := color.New(color.FgRed)
lastCve := ""
for _, r := range l.Results {
if lastCve != r.CveId {
fmt.Println()
bold.Print(r.CveId)
fmt.Printf(" (%s) -- %s\n", r.Cna, r.File)
}
lastCve = r.CveId
fmt.Print(" ")
red.Printf("%s ", r.Code)
fmt.Print(r.Error.Text)
if r.Error.JsonPath != "" {
fmt.Printf(" (at \"%s\")\n", r.Error.JsonPath)
} else {
fmt.Println()
}
}
fmt.Printf("\nFound %d error", len(l.Results)+len(l.GenericErrors))
if len(l.Results) != 1 {
fmt.Print("s.\n")
} else {
fmt.Print(".\n")
}
case "json":
fmt.Println("{")
fmt.Printf(` "generatedAt": "%s",`+"\n", l.Timestamp.Format(time.RFC3339))
fmt.Println(` "results": [`)
for i, r := range l.Results {
fmt.Println(" {")
errorJson, _ := json.Marshal(r.Error.Text)
fmt.Printf(` "cve": "%s",`+"\n", r.CveId)
fmt.Printf(` "cna": "%s",`+"\n", r.Cna)
fmt.Printf(` "file": "%s",`+"\n", r.File)
fmt.Printf(` "ruleName": "%s",`+"\n", r.Rule.Name)
fmt.Printf(` "errorCode": "%s",`+"\n", r.Rule.Code)
fmt.Printf(` "errorPath": "%s",`+"\n", r.Error.JsonPath)
fmt.Printf(` "errorText": %s`+"\n", errorJson)
fmt.Print(" }")
if i+1 != len(l.Results) {
fmt.Print(",")
}
fmt.Println()
}
fmt.Println(" ]")
fmt.Println("}")
case "csv":
if len(l.Results) == 0 {
return
}
fmt.Println("CVE,CNA,File,RuleName,ErrorCode,ErrorText")
for _, r := range l.Results {
fmt.Printf("%s,%s,%s,%s,%s,%s,%s\n", r.CveId, r.Cna, r.File, r.Rule.Name, r.Rule.Code, r.Error.JsonPath, r.Error.Text)
}
default:
log.Fatal("ERROR: Invalid output format, must be one of: text, json, csv")
}
}