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feed.go
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/
feed.go
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// Package cvefeed defines types and methods necessary to parse NVD vulnerability
// feed and match an inventory of CPE names against it.
//
// Copyright (c) Facebook, Inc. and its affiliates.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package cvefeed provides an API to NVD CVE feeds parsing and matching.
package cvefeed
import (
"bufio"
"compress/bzip2"
"compress/gzip"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"github.com/facebookincubator/nvdtools/cvefeed/nvd"
"github.com/facebookincubator/nvdtools/cvefeed/nvd/schema"
)
// ParseJSON parses JSON dictionary from NVD vulnerability feed
func ParseJSON(in io.Reader) ([]Vuln, error) {
feed, err := getFeed(in)
if err != nil {
return nil, fmt.Errorf("cvefeed.ParseJSON: %v", err)
}
vulns := make([]Vuln, 0, len(feed.CVEItems))
for _, cve := range feed.CVEItems {
if cve != nil && cve.Configurations != nil {
vulns = append(vulns, nvd.ToVuln(cve))
}
}
return vulns, nil
}
func getFeed(in io.Reader) (*schema.NVDCVEFeedJSON10, error) {
reader, err := setupReader(in)
if err != nil {
return nil, fmt.Errorf("can't setup reader: %v", err)
}
defer reader.Close()
var feed schema.NVDCVEFeedJSON10
if err := json.NewDecoder(reader).Decode(&feed); err != nil {
return nil, err
}
return &feed, nil
}
func setupReader(in io.Reader) (src io.ReadCloser, err error) {
r := bufio.NewReader(in)
header, err := r.Peek(2)
if err != nil {
return nil, err
}
// assume plain text first
src = ioutil.NopCloser(r)
// replace with gzip.Reader if gzip'ed
if header[0] == 0x1f && header[1] == 0x8b { // file is gzip'ed
zr, err := gzip.NewReader(r)
if err != nil {
return nil, err
}
src = zr
} else if header[0] == 'B' && header[1] == 'Z' {
// or with bzip2.Reader if bzip2'ed
src = ioutil.NopCloser(bzip2.NewReader(r))
}
// TODO: maybe support .zip
return src, nil
}