diff --git a/.github/FUNDING.yaml b/.github/FUNDING.yaml new file mode 100644 index 0000000..c20c1fc --- /dev/null +++ b/.github/FUNDING.yaml @@ -0,0 +1 @@ +github: ["dwisiswant0"] \ No newline at end of file diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml new file mode 100644 index 0000000..bd6c94f --- /dev/null +++ b/.github/workflows/tests.yaml @@ -0,0 +1,30 @@ +on: + push: + branches: + - master + paths: + - "**.go" + - "go.mod" + pull_request: + branches: + - "**" + paths: + - "**.go" + - "go.mod" + workflow_dispatch: + +name: tests +jobs: + tests: + runs-on: ubuntu-latest + steps: + - uses: actions/checkout@v3 + - uses: actions/setup-go@v5 + with: + go-version-file: 'go.mod' + cache-dependency-path: '**/go.sum' + - run: go test -v -race ./... + - name: golangci-lint + uses: golangci/golangci-lint-action@v4 + with: + args: --timeout=5m diff --git a/CODEOWNERS b/CODEOWNERS new file mode 100644 index 0000000..bddc66a --- /dev/null +++ b/CODEOWNERS @@ -0,0 +1 @@ +* @dwisiswant0 \ No newline at end of file diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000..d516fb0 --- /dev/null +++ b/LICENSE @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. 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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright 2024 Dwi Siswanto + + 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. diff --git a/README.md b/README.md new file mode 100644 index 0000000..30099dd --- /dev/null +++ b/README.md @@ -0,0 +1,81 @@ +# sebel + +[![GoDoc](https://pkg.go.dev/static/frontend/badge/badge.svg)](http://pkg.go.dev/github.com/teler-sh/sebel) +[![tests](https://github.com/teler-sh/sebel/actions/workflows/tests.yaml/badge.svg)](https://github.com/teler-sh/sebel/actions/workflows/tests.yaml) + +sebel is a Go package that provides functionality for checking SSL/TLS certificates against malicious connections, by identifying and blacklisting certificates used by botnet command and control (C&C) servers. + +## Usage + +Setting up Sebel instance: + +```go +import "github.com/teler-sh/sebel" + +// ... + +s := sebel.New(Options{/* ... */}) +``` + +> [!NOTE] +> The `Options` parameter is optional. Currently, the only supported option is disabling the SSL blacklist. See [TODO](#TODO). + +### Examples + +Next, set the transport for the HTTP client you are using: + +```go +// initialize Sebel (fetch SSLBL data) +s := sebel.New() + +client := &http.Client{ + Transport: s.RoundTripper(http.DefaultTransport), +} + +// now, you can use [client.Do], [client.Get], etc. to create requests. + +resp, err := client.Get("https://c2.host") +if err != nil && sebel.IsBlacklist(err) { + // certificate blacklisted + panic(err) +} +defer resp.Body.Close() +``` + +Alternatively, for seamless integration without configuring a new client, replace your current default HTTP client with Sebel's `RoundTripper`: + +```go +http.DefaultClient.Transport = sebel.New().RoundTripper(http.DefaultTransport) +``` + +You can also check the certificate later using Sebel's `CheckTLS`. + +```go +r, err := http.Get("https://c2.host") +if err != nil { + panic(err) +} +defer r.Body.Close() + +s := sebel.New() + +_, err = s.CheckTLS(r.TLS) +if err != nil && sebel.IsBlacklist(err) { + // certificate blacklisted + panic(err) +} +``` + +These examples demonstrate various ways to set up Sebel and integrate it with HTTP clients for SSL/TLS certificate checks. + +## TODO + +* [ ] Caching SSLBL data under user-specific cache directory. +* [ ] Add `io.Writer` option. +* [ ] Add `CheckIP` method. + +# License + +`sebel` is released by [**@dwisiswant0**](https://github.com/dwisiswant0) under the Apache 2.0 license. See [LICENSE](/LICENSE). + +The data used in this project are © by [abuse.ch](https://abuse.ch/) under [CC0](https://creativecommons.org/public-domain/cc0/). \ No newline at end of file diff --git a/data.go b/data.go new file mode 100644 index 0000000..b5c41c6 --- /dev/null +++ b/data.go @@ -0,0 +1,7 @@ +package sebel + +import "github.com/teler-sh/sebel/pkg/sslbl" + +type data struct { + sslbl []sslbl.Record +} diff --git a/doc.go b/doc.go new file mode 100644 index 0000000..4c1d036 --- /dev/null +++ b/doc.go @@ -0,0 +1,4 @@ +// Package sebel provides functionality for checking SSL/TLS certificates +// against a malicious connections, by identifying and blacklisting certificates +// used by botnet command and control (C&C) servers. +package sebel diff --git a/errors.go b/errors.go new file mode 100644 index 0000000..702df65 --- /dev/null +++ b/errors.go @@ -0,0 +1,17 @@ +package sebel + +import "errors" + +var ( + ErrSSLBlacklist = errors.New("certificate blacklisted") + ErrNoSSLBLData = errors.New("no SSLBL data") +) + +// IsBlacklist checks if the given error is an [ErrSSLBlacklist]. +func IsBlacklist(err error) bool { + if err == nil { + return false + } + + return errors.Is(err, ErrSSLBlacklist) +} diff --git a/errors_test.go b/errors_test.go new file mode 100644 index 0000000..3dd70fe --- /dev/null +++ b/errors_test.go @@ -0,0 +1,19 @@ +package sebel + +import "testing" + +func TestIsBlacklist(t *testing.T) { + t.Parallel() + + t.Run("true", func(t *testing.T) { + if IsBlacklist(ErrSSLBlacklist) != true { + t.Fail() + } + }) + + t.Run("false", func(t *testing.T) { + if IsBlacklist(ErrNoSSLBLData) == true { + t.Fail() + } + }) +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..8f81472 --- /dev/null +++ b/go.mod @@ -0,0 +1,10 @@ +module github.com/teler-sh/sebel + +go 1.22.0 + +require ( + github.com/patrickmn/go-cache v2.1.0+incompatible + github.com/samber/lo v1.39.0 +) + +require golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17 // indirect diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..d2a0d38 --- /dev/null +++ b/go.sum @@ -0,0 +1,6 @@ +github.com/patrickmn/go-cache v2.1.0+incompatible h1:HRMgzkcYKYpi3C8ajMPV8OFXaaRUnok+kx1WdO15EQc= +github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTKqZju1ZixQ/KpMGzzAfe6+WQ= +github.com/samber/lo v1.39.0 h1:4gTz1wUhNYLhFSKl6O+8peW0v2F4BCY034GRpU9WnuA= +github.com/samber/lo v1.39.0/go.mod h1:+m/ZKRl6ClXCE2Lgf3MsQlWfh4bn1bz6CXEOxnEXnEA= +golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17 h1:3MTrJm4PyNL9NBqvYDSj3DHl46qQakyfqfWo4jgfaEM= +golang.org/x/exp v0.0.0-20220303212507-bbda1eaf7a17/go.mod h1:lgLbSvA5ygNOMpwM/9anMpWVlVJ7Z+cHWq/eFuinpGE= diff --git a/options.go b/options.go new file mode 100644 index 0000000..270a9bd --- /dev/null +++ b/options.go @@ -0,0 +1,12 @@ +package sebel + +// Options holds configuration settings for the [Sebel] package. +type Options struct { + // DisableSSLBlacklist, when set to true, disables SSL/TLS certificate + // blacklist checks. + DisableSSLBlacklist bool + + // TODO(dwisiswant0): Add these fields + // DisableIPBlacklist bool + // Output io.Writer +} diff --git a/pkg/cert/cert.go b/pkg/cert/cert.go new file mode 100644 index 0000000..5d06b00 --- /dev/null +++ b/pkg/cert/cert.go @@ -0,0 +1,60 @@ +// Package cert provides utilities for working with SSL/TLS certificates, +// including fingerprint generation. +package cert + +import ( + "bytes" + "fmt" + + "crypto/sha1" + "crypto/sha256" + "crypto/x509" +) + +// Fingerprint defines methods to calculate SHA1 and SHA256 fingerprints. +// +// If the certificate is nil, an empty buffer is returned from SHA1 & SHA256. +type Fingerprint interface { + SHA1() *bytes.Buffer + SHA256() *bytes.Buffer +} + +// fingerprint implementation of Fingerprint interface. +type fingerprint struct { + *x509.Certificate +} + +// New creates a new Fingerprint instance based on the [x509.Certificate]. +func New(cert *x509.Certificate) Fingerprint { + return &fingerprint{Certificate: cert} +} + +func (f *fingerprint) SHA1() *bytes.Buffer { + var b bytes.Buffer + + if f.Certificate == nil { + return &b + } + + sha1sum := sha1.Sum(f.Certificate.Raw) + for _, v := range sha1sum { + fmt.Fprintf(&b, "%02x", v) + } + + return &b +} + +func (f *fingerprint) SHA256() *bytes.Buffer { + var b bytes.Buffer + + if f.Certificate == nil { + return &b + } + + sha256sum := sha256.Sum256(f.Certificate.Raw) + for _, v := range sha256sum { + fmt.Fprintf(&b, "%02x", v) + } + + return &b +} diff --git a/pkg/sslbl/const.go b/pkg/sslbl/const.go new file mode 100644 index 0000000..a6d96fe --- /dev/null +++ b/pkg/sslbl/const.go @@ -0,0 +1,3 @@ +package sslbl + +const dataURL = "https://sslbl.abuse.ch/blacklist/sslblacklist.csv" diff --git a/pkg/sslbl/doc.go b/pkg/sslbl/doc.go new file mode 100644 index 0000000..12d1abd --- /dev/null +++ b/pkg/sslbl/doc.go @@ -0,0 +1,3 @@ +// Package sslbl provides a simple SSL Blacklist (SSLBL) implementation for +// checking certificates. +package sslbl diff --git a/pkg/sslbl/record.go b/pkg/sslbl/record.go new file mode 100644 index 0000000..08f7f5c --- /dev/null +++ b/pkg/sslbl/record.go @@ -0,0 +1,15 @@ +package sslbl + +// Record represents an entry in the SSL Blacklist (SSLBL). +type Record struct { + Listing struct { + // Date is the date when the SSL certificate was listed in the SSLBL. + Date string + // Reason provides information about why the SSL certificate was + // blacklisted. + Reason string + } + // SHA1Sum is the SHA-1 fingerprint of the SSL certificate associated with + // the record. + SHA1Sum string +} diff --git a/pkg/sslbl/sslbl.go b/pkg/sslbl/sslbl.go new file mode 100644 index 0000000..494643e --- /dev/null +++ b/pkg/sslbl/sslbl.go @@ -0,0 +1,62 @@ +package sslbl + +import ( + "io" + + "encoding/csv" + "net/http" + + "github.com/samber/lo" +) + +// Find searches for a record with a given SHA-1 fingerprint in a slice of SSLBL +// records. +// +// It returns the found record and a boolean indicating whether the record was +// found. +func Find(sha1sum string, records []Record) (*Record, bool) { + record, ok := lo.Find(records, func(r Record) bool { + return r.SHA1Sum == sha1sum + }) + + return &record, ok +} + +// Get retrieves SSLBL records from a `sslbl.abuse.ch`, parses the CSV data, +// and returns them. +func Get() ([]Record, error) { + var records []Record + + resp, err := http.Get(dataURL) + if err != nil { + return records, err + } + defer resp.Body.Close() + + body, err := io.ReadAll(resp.Body) + if err != nil { + return records, err + } + + csvData := sanitizeBody(body) + csvReader := csv.NewReader(csvData) + + data, err := csvReader.ReadAll() + if err != nil { + return records, err + } + records = parseCSV(data) + + return records, nil +} + +// MustGet is like [Get] but panics if there is an error during the retrieval +// process. +func MustGet() []Record { + records, err := Get() + if err != nil { + panic(err) + } + + return records +} diff --git a/pkg/sslbl/utils.go b/pkg/sslbl/utils.go new file mode 100644 index 0000000..17c6a0f --- /dev/null +++ b/pkg/sslbl/utils.go @@ -0,0 +1,44 @@ +package sslbl + +import "bytes" + +func sanitizeBody(body []byte) *bytes.Reader { + lines := bytes.Split(body, []byte("\n")) + var split [][]byte + + for _, line := range lines { + if !bytes.HasPrefix(line, []byte("#")) { + split = append(split, line) + } + } + + cleaned := bytes.Join(split, []byte("\n")) + + // pattern := regexp.MustCompile(`^\s*#.*$`) + // cleaned := pattern.ReplaceAll(body, []byte("")) + + return bytes.NewReader(cleaned) +} + +func parseCSV(records [][]string) []Record { + var sslBlRecords []Record + + for _, record := range records { + var data Record + + for i, value := range record { + switch i { + case 0: + data.Listing.Date = value + case 1: + data.SHA1Sum = value + case 2: + data.Listing.Reason = value + } + } + + sslBlRecords = append(sslBlRecords, data) + } + + return sslBlRecords +} diff --git a/roundtripper.go b/roundtripper.go new file mode 100644 index 0000000..645aec5 --- /dev/null +++ b/roundtripper.go @@ -0,0 +1,28 @@ +package sebel + +import ( + "net/http" +) + +// roundTripper is a wrapper for the [http.RoundTripper] interface with a +// reference to Sebel. +type roundTripper struct { + http.RoundTripper + sebel *Sebel +} + +// RoundTrip implements the [http.RoundTripper] interface and checks the TLS +// connection after the round trip. +func (rt *roundTripper) RoundTrip(req *http.Request) (*http.Response, error) { + resp, err := rt.RoundTripper.RoundTrip(req) + if resp.TLS != nil && err == nil { + rt.sebel.tls = resp.TLS + + _, err = rt.sebel.checkTLS() + if err != nil { + resp = nil + } + } + + return resp, err +} diff --git a/roundtripper_test.go b/roundtripper_test.go new file mode 100644 index 0000000..49c5280 --- /dev/null +++ b/roundtripper_test.go @@ -0,0 +1,24 @@ +package sebel + +import ( + "testing" + + "net/http" +) + +func TestRoundTrip(t *testing.T) { + t.Parallel() + + tr := http.DefaultTransport + rt := &roundTripper{RoundTripper: tr, sebel: sebel} + + req, err := http.NewRequest("GET", "https://httpbin.org/get", nil) + if err != nil { + t.SkipNow() + } + + _, err = rt.RoundTrip(req) + if err != nil { + t.Fail() + } +} diff --git a/sebel.go b/sebel.go new file mode 100644 index 0000000..cb944e5 --- /dev/null +++ b/sebel.go @@ -0,0 +1,92 @@ +package sebel + +import ( + "crypto/tls" + "crypto/x509" + "net/http" + + "github.com/teler-sh/sebel/pkg/cert" + "github.com/teler-sh/sebel/pkg/sslbl" +) + +// Sebel holds information and [Options]. +type Sebel struct { + data data + options *Options + tls *tls.ConnectionState +} + +// New creates a new instance of [Sebel] with the provided options. +func New(opt ...Options) *Sebel { + sebel := new(Sebel) + + if len(opt) > 0 { + sebel.options = &opt[0] + } else { + sebel.options = new(Options) + } + + sebel.data.sslbl = sslbl.MustGet() + + return sebel +} + +// RoundTripper creates a new RoundTripper using the provided [http.RoundTripper] +// and [Sebel] instance. +func (s *Sebel) RoundTripper(rt http.RoundTripper) http.RoundTripper { + return &roundTripper{RoundTripper: rt, sebel: s} +} + +// CheckTLS checks the TLS connection against the SSLBL (SSL Blacklist) and +// returns the SSLBL record. +// +// It returns [ErrSSLBlacklist] error if the certificate is blacklisted. +func (s *Sebel) CheckTLS(connState *tls.ConnectionState) (*sslbl.Record, error) { + s.tls = connState + + return s.checkTLS() +} + +// getCert retrieves the peer certificate from the TLS connection state. +func (s *Sebel) getCert() *x509.Certificate { + if s.tls == nil { + return nil + } + + if cert := s.tls.PeerCertificates; len(cert) > 0 { + return cert[0] + } + + return nil +} + +// checkTLS runs actual checks on the TLS connection and returns the SSLBL +// record and [ErrSSLBlacklist] error if blacklisted. +func (s *Sebel) checkTLS() (*sslbl.Record, error) { + record, ok := new(sslbl.Record), false + + // return early if disabled + if s.options.DisableSSLBlacklist { + return record, nil + } + + data := s.data.sslbl + if len(data) == 0 { + return record, ErrNoSSLBLData + } + + certificate := s.getCert() + if certificate == nil { + return record, nil + } + + fingerprint := cert.New(certificate) + sha1sum := fingerprint.SHA1().String() + + record, ok = sslbl.Find(sha1sum, data) + if ok { + return record, ErrSSLBlacklist + } + + return record, nil +} diff --git a/sebel_example_test.go b/sebel_example_test.go new file mode 100644 index 0000000..3088fbc --- /dev/null +++ b/sebel_example_test.go @@ -0,0 +1,44 @@ +package sebel_test + +import ( + "net/http" + + "github.com/teler-sh/sebel" +) + +func ExampleNew() { + client := &http.Client{ + Transport: sebel.New().RoundTripper(http.DefaultTransport), + } + + resp, err := client.Get("https://c2.host") + if err != nil && sebel.IsBlacklist(err) { + // certificate blacklisted + panic(err) + } + defer resp.Body.Close() + + println("OK") +} + +func ExampleSebel_CheckTLS() { + r, err := http.Get("https://c2.host") + if err != nil { + panic(err) + } + defer r.Body.Close() + + s := sebel.New() + + _, err = s.CheckTLS(r.TLS) + if err != nil && sebel.IsBlacklist(err) { + // certificate blacklisted + panic(err) + } +} + +// To seamlessly integrate it without need to configure a new client, you can +// simply replace your current http.DefaultClient with sebel's RoundTripper. +func ExampleSebel_RoundTripper() { + http.DefaultClient.Transport = sebel.New().RoundTripper(http.DefaultTransport) +} diff --git a/sebel_test.go b/sebel_test.go new file mode 100644 index 0000000..b367f11 --- /dev/null +++ b/sebel_test.go @@ -0,0 +1,86 @@ +package sebel + +import ( + "testing" + + "net/http" +) + +var sebel *Sebel + +func init() { + sebel = New() +} + +func TestNew(t *testing.T) { + t.Parallel() + + t.Run("empty", func(t *testing.T) { + if sebel == nil { + t.Fail() + } + }) + + t.Run("set", func(t *testing.T) { + sebelWithOptions := New(Options{DisableSSLBlacklist: true}) + if !sebelWithOptions.options.DisableSSLBlacklist { + t.Fail() + } + }) +} + +func TestRoundTripper(t *testing.T) { + t.Parallel() + + tr := http.DefaultTransport + if tr == sebel.RoundTripper(tr) { + t.Fail() + } +} + +func TestCheckTLS(t *testing.T) { + resp, err := http.Get("https://httpbin.org/get") + if err != nil { + t.SkipNow() + } + + if resp.TLS == nil { + t.SkipNow() + } + + t.Parallel() + + t.Run("default", func(t *testing.T) { + _, err := sebel.CheckTLS(resp.TLS) + if err != nil { + t.Fail() + } + }) + + t.Run("WithDisableSSLBlacklist", func(t *testing.T) { + sebelWithOptions := New(Options{DisableSSLBlacklist: true}) + + _, err := sebelWithOptions.CheckTLS(resp.TLS) + if err != nil { + t.Fail() + } + }) +} + +func BenchmarkCheckTLS(b *testing.B) { + resp, err := http.Get("https://httpbin.org/get") + if err != nil { + b.SkipNow() + } + + if resp.TLS == nil { + b.SkipNow() + } + + b.ReportAllocs() + b.ResetTimer() + + for i := 0; i < b.N; i++ { + _, _ = sebel.CheckTLS(resp.TLS) + } +}