fix repos

By default base64 decoder works in non-strict mode which
allows tweaking signatures having padding without failing validation.

This creates a potential problem if application treats token value as an identifier.

For example ES256 signature has length of 64 bytes and two padding symbols (stripped by default).
Therefore its base64-encoded value can only end with A, Q, g and w.
In non-strict mode last symbol could be tweaked resulting in 16 distinct
token values having the same signature and passing validation.

This change adds backward-compatible global config variable DecodeStrict
(similar to existing DecodePaddingAllowed) that enables strict base64 decoder mode.

See also https://github.com/golang/go/issues/15656.

Signed-off-by: Alexander Yastrebov <yastrebov.alex@gmail.com>

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go: [1.16, 1.17, 1.18]
+        go: [1.17, 1.18, 1.19]
     steps:
       - name: Checkout
         uses: actions/checkout@v3
@@ -33,6 +33,8 @@ jobs:
         uses: actions/setup-go@v3
         with:
           go-version: "${{ matrix.go }}"
+          check-latest: true
+          cache: true
       - name: Check Go code formatting
         run: |
           if [ "$(gofmt -s -l . | wc -l)" -gt 0 ]; then
@@ -42,6 +44,7 @@ jobs:
           fi
       - name: Build
         run: |
+          go install github.com/mfridman/tparse@latest
           go vet ./...
-          go test -v ./...
+          go test -v -race -count=1 -json -coverpkg=$(go list ./...) ./... | tparse -follow -notests
           go build ./...

MIGRATION_GUIDE.md

@@ -2,18 +2,18 @@
 
 Starting from [v4.0.0](https://github.com/golang-jwt/jwt/releases/tag/v4.0.0), the import path will be:
 
-    "github.com/golang-jwt/jwt/v4"
+    "git.internal/re/jwt/v4"
 
 The `/v4` version will be backwards compatible with existing `v3.x.y` tags in this repo, as well as 
 `github.com/dgrijalva/jwt-go`. For most users this should be a drop-in replacement, if you're having 
 troubles migrating, please open an issue.
 
-You can replace all occurrences of `github.com/dgrijalva/jwt-go` or `github.com/golang-jwt/jwt` with `github.com/golang-jwt/jwt/v4`, either manually or by using tools such as `sed` or `gofmt`.
+You can replace all occurrences of `github.com/dgrijalva/jwt-go` or `github.com/golang-jwt/jwt` with `git.internal/re/jwt/v4`, either manually or by using tools such as `sed` or `gofmt`.
 
 And then you'd typically run:
 
 ```
-go get github.com/golang-jwt/jwt/v4
+go get git.internal/re/jwt/v4
 go mod tidy
 ```
 

README.md

@@ -1,7 +1,7 @@
 # jwt-go
 
 [![build](https://github.com/golang-jwt/jwt/actions/workflows/build.yml/badge.svg)](https://github.com/golang-jwt/jwt/actions/workflows/build.yml)
-[![Go Reference](https://pkg.go.dev/badge/github.com/golang-jwt/jwt/v4.svg)](https://pkg.go.dev/github.com/golang-jwt/jwt/v4)
+[![Go Reference](https://pkg.go.dev/badge/git.internal/re/jwt/v4.svg)](https://pkg.go.dev/git.internal/re/jwt/v4)
 
 A [go](http://www.golang.org) (or 'golang' for search engine friendliness) implementation of [JSON Web Tokens](https://datatracker.ietf.org/doc/html/rfc7519).
 
@@ -41,22 +41,22 @@ This library supports the parsing and verification as well as the generation and
 1. To install the jwt package, you first need to have [Go](https://go.dev/doc/install) installed, then you can use the command below to add `jwt-go` as a dependency in your Go program.
 
 ```sh
-go get -u github.com/golang-jwt/jwt/v4
+go get -u git.internal/re/jwt/v4
 ```
 
 2. Import it in your code:
 
 ```go
-import "github.com/golang-jwt/jwt/v4"
+import "git.internal/re/jwt/v4"
 ```
 
 ## Examples
 
-See [the project documentation](https://pkg.go.dev/github.com/golang-jwt/jwt/v4) for examples of usage:
+See [the project documentation](https://pkg.go.dev/git.internal/re/jwt/v4) for examples of usage:
 
-* [Simple example of parsing and validating a token](https://pkg.go.dev/github.com/golang-jwt/jwt#example-Parse-Hmac)
-* [Simple example of building and signing a token](https://pkg.go.dev/github.com/golang-jwt/jwt#example-New-Hmac)
-* [Directory of Examples](https://pkg.go.dev/github.com/golang-jwt/jwt#pkg-examples)
+* [Simple example of parsing and validating a token](https://pkg.go.dev/git.internal/re/jwt/v4#example-Parse-Hmac)
+* [Simple example of building and signing a token](https://pkg.go.dev/git.internal/re/jwt/v4#example-New-Hmac)
+* [Directory of Examples](https://pkg.go.dev/git.internal/re/jwt/v4#pkg-examples)
 
 ## Extensions
 
@@ -96,7 +96,7 @@ A token is simply a JSON object that is signed by its author. this tells you exa
 * The author of the token was in the possession of the signing secret
 * The data has not been modified since it was signed
 
-It's important to know that JWT does not provide encryption, which means anyone who has access to the token can read its contents. If you need to protect (encrypt) the data, there is a companion spec, `JWE`, that provides this functionality. JWE is currently outside the scope of this library.
+It's important to know that JWT does not provide encryption, which means anyone who has access to the token can read its contents. If you need to protect (encrypt) the data, there is a companion spec, `JWE`, that provides this functionality. The companion project https://github.com/golang-jwt/jwe aims at a (very) experimental implementation of the JWE standard.
 
 ### Choosing a Signing Method
 
@@ -110,10 +110,10 @@ Asymmetric signing methods, such as RSA, use different keys for signing and veri
 
 Each signing method expects a different object type for its signing keys. See the package documentation for details. Here are the most common ones:
 
-* The [HMAC signing method](https://pkg.go.dev/github.com/golang-jwt/jwt#SigningMethodHMAC) (`HS256`,`HS384`,`HS512`) expect `[]byte` values for signing and validation
-* The [RSA signing method](https://pkg.go.dev/github.com/golang-jwt/jwt#SigningMethodRSA) (`RS256`,`RS384`,`RS512`) expect `*rsa.PrivateKey` for signing and `*rsa.PublicKey` for validation
-* The [ECDSA signing method](https://pkg.go.dev/github.com/golang-jwt/jwt#SigningMethodECDSA) (`ES256`,`ES384`,`ES512`) expect `*ecdsa.PrivateKey` for signing and `*ecdsa.PublicKey` for validation
-* The [EdDSA signing method](https://pkg.go.dev/github.com/golang-jwt/jwt#SigningMethodEd25519) (`Ed25519`) expect `ed25519.PrivateKey` for signing and `ed25519.PublicKey` for validation
+* The [HMAC signing method](https://pkg.go.dev/git.internal/re/jwt/v4#SigningMethodHMAC) (`HS256`,`HS384`,`HS512`) expect `[]byte` values for signing and validation
+* The [RSA signing method](https://pkg.go.dev/git.internal/re/jwt/v4#SigningMethodRSA) (`RS256`,`RS384`,`RS512`) expect `*rsa.PrivateKey` for signing and `*rsa.PublicKey` for validation
+* The [ECDSA signing method](https://pkg.go.dev/git.internal/re/jwt/v4#SigningMethodECDSA) (`ES256`,`ES384`,`ES512`) expect `*ecdsa.PrivateKey` for signing and `*ecdsa.PublicKey` for validation
+* The [EdDSA signing method](https://pkg.go.dev/git.internal/re/jwt/v4#SigningMethodEd25519) (`Ed25519`) expect `ed25519.PrivateKey` for signing and `ed25519.PublicKey` for validation
 
 ### JWT and OAuth
 
@@ -131,7 +131,7 @@ This library uses descriptive error messages whenever possible. If you are not g
 
 ## More
 
-Documentation can be found [on pkg.go.dev](https://pkg.go.dev/github.com/golang-jwt/jwt).
+Documentation can be found [on pkg.go.dev](https://pkg.go.dev/git.internal/re/jwt/v4).
 
 The command line utility included in this project (cmd/jwt) provides a straightforward example of token creation and parsing as well as a useful tool for debugging your own integration. You'll also find several implementation examples in the documentation.
 

SECURITY.md

@@ -6,7 +6,7 @@ As of February 2022 (and until this document is updated), the latest version `v4
 
 ## Reporting a Vulnerability
 
-If you think you found a vulnerability, and even if you are not sure, please report it to [@mfridman](http://github.com/mfridman) or one of the other [golang-jwt maintainers](https://github.com/orgs/golang-jwt/people). Please try be explicit, describe steps to reproduce the security issue with code example(s).
+If you think you found a vulnerability, and even if you are not sure, please report it to jwt-go-security@googlegroups.com or one of the other [golang-jwt maintainers](https://github.com/orgs/golang-jwt/people). Please try be explicit, describe steps to reproduce the security issue with code example(s).
 
 You will receive a response within a timely manner. If the issue is confirmed, we will do our best to release a patch as soon as possible given the complexity of the problem.
 

claims.go

@@ -265,9 +265,5 @@ func verifyIss(iss string, cmp string, required bool) bool {
 	if iss == "" {
 		return !required
 	}
-	if subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0 {
-		return true
-	} else {
-		return false
-	}
+	return subtle.ConstantTimeCompare([]byte(iss), []byte(cmp)) != 0
 }

cmd/jwt/README.md

@@ -16,4 +16,4 @@ To simply display a token, use:
 
 You can install this tool with the following command:
 
-     go install github.com/golang-jwt/jwt/v4/cmd/jwt
+     go install git.internal/re/jwt/v4/cmd/jwt

cmd/jwt/main.go

@@ -3,7 +3,8 @@
 //
 // Example usage:
 // The following will create and sign a token, then verify it and output the original claims.
-//     echo {\"foo\":\"bar\"} | bin/jwt -key test/sample_key -alg RS256 -sign - | bin/jwt -key test/sample_key.pub -verify -
+//
+//	echo {\"foo\":\"bar\"} | bin/jwt -key test/sample_key -alg RS256 -sign - | bin/jwt -key test/sample_key.pub -verify -
 package main
 
 import (
@@ -16,7 +17,7 @@ import (
 	"sort"
 	"strings"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 var (

ecdsa_test.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 var ecdsaTestData = []struct {
@@ -90,7 +90,6 @@ func TestECDSASign(t *testing.T) {
 			toSign := strings.Join(parts[0:2], ".")
 			method := jwt.GetSigningMethod(data.alg)
 			sig, err := method.Sign(toSign, ecdsaKey)
-
 			if err != nil {
 				t.Errorf("[%v] Error signing token: %v", data.name, err)
 			}

ed25519_test.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 var ed25519TestData = []struct {

example_test.go

@@ -5,7 +5,7 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 // Example (atypical) using the RegisteredClaims type by itself to parse a token.
@@ -25,7 +25,7 @@ func ExampleNewWithClaims_registeredClaims() {
 	token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
 	ss, err := token.SignedString(mySigningKey)
 	fmt.Printf("%v %v", ss, err)
-	//Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ0ZXN0IiwiZXhwIjoxNTE2MjM5MDIyfQ.0XN_1Tpp9FszFOonIBpwha0c_SfnNI22DhTnjMshPg8 <nil>
+	// Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJ0ZXN0IiwiZXhwIjoxNTE2MjM5MDIyfQ.0XN_1Tpp9FszFOonIBpwha0c_SfnNI22DhTnjMshPg8 <nil>
 }
 
 // Example creating a token using a custom claims type. The RegisteredClaims is embedded
@@ -67,7 +67,7 @@ func ExampleNewWithClaims_customClaimsType() {
 	ss, err := token.SignedString(mySigningKey)
 	fmt.Printf("%v %v", ss, err)
 
-	//Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJpc3MiOiJ0ZXN0IiwiZXhwIjoxNTE2MjM5MDIyfQ.xVuY2FZ_MRXMIEgVQ7J-TFtaucVFRXUzHm9LmV41goM <nil>
+	// Output: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJpc3MiOiJ0ZXN0IiwiZXhwIjoxNTE2MjM5MDIyfQ.xVuY2FZ_MRXMIEgVQ7J-TFtaucVFRXUzHm9LmV41goM <nil>
 }
 
 // Example creating a token using a custom claims type.  The StandardClaim is embedded
@@ -96,7 +96,7 @@ func ExampleParseWithClaims_customClaimsType() {
 // An example of parsing the error types using bitfield checks
 func ExampleParse_errorChecking() {
 	// Token from another example.  This token is expired
-	var tokenString = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c"
+	tokenString := "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIiLCJleHAiOjE1MDAwLCJpc3MiOiJ0ZXN0In0.HE7fK0xOQwFEr4WDgRWj4teRPZ6i3GLwD5YCm6Pwu_c"
 
 	token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
 		return []byte("AllYourBase"), nil

go.mod

@@ -1,4 +1,4 @@
-module github.com/golang-jwt/jwt/v4
+module git.internal/re/jwt/v4
 
 go 1.16
 

hmac_example_test.go

@@ -5,7 +5,7 @@ import (
 	"os"
 	"time"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 // For HMAC signing method, the key can be any []byte. It is recommended to generate

hmac_test.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 var hmacTestData = []struct {

http_example_test.go

@@ -16,8 +16,8 @@ import (
 	"strings"
 	"time"
 
-	"github.com/golang-jwt/jwt/v4"
-	"github.com/golang-jwt/jwt/v4/request"
+	"git.internal/re/jwt/v4"
+	"git.internal/re/jwt/v4/request"
 )
 
 // location of the files used for signing and verification
@@ -73,7 +73,7 @@ type CustomerInfo struct {
 }
 
 type CustomClaimsExample struct {
-	*jwt.RegisteredClaims
+	jwt.RegisteredClaims
 	TokenType string
 	CustomerInfo
 }
@@ -109,11 +109,10 @@ func Example_getTokenViaHTTP() {
 	claims := token.Claims.(*CustomClaimsExample)
 	fmt.Println(claims.CustomerInfo.Name)
 
-	//Output: test
+	// Output: test
 }
 
 func Example_useTokenViaHTTP() {
-
 	// Make a sample token
 	// In a real world situation, this token will have been acquired from
 	// some other API call (see Example_getTokenViaHTTP)
@@ -142,7 +141,7 @@ func createToken(user string) (string, error) {
 
 	// set our claims
 	t.Claims = &CustomClaimsExample{
-		&jwt.RegisteredClaims{
+		jwt.RegisteredClaims{
 			// set the expire time
 			// see https://datatracker.ietf.org/doc/html/rfc7519#section-4.1.4
 			ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Minute * 1)),
@@ -197,7 +196,6 @@ func restrictedHandler(w http.ResponseWriter, r *http.Request) {
 		// we also only use its public counter part to verify
 		return verifyKey, nil
 	}, request.WithClaims(&CustomClaimsExample{}))
-
 	// If the token is missing or invalid, return error
 	if err != nil {
 		w.WriteHeader(http.StatusUnauthorized)

none_test.go

@@ -4,7 +4,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 var noneTestData = []struct {

parser.go

@@ -42,6 +42,13 @@ func (p *Parser) Parse(tokenString string, keyFunc Keyfunc) (*Token, error) {
 	return p.ParseWithClaims(tokenString, MapClaims{}, keyFunc)
 }
 
+// ParseWithClaims parses, validates, and verifies like Parse, but supplies a default object implementing the Claims
+// interface. This provides default values which can be overridden and allows a caller to use their own type, rather
+// than the default MapClaims implementation of Claims.
+//
+// Note: If you provide a custom claim implementation that embeds one of the standard claims (such as RegisteredClaims),
+// make sure that a) you either embed a non-pointer version of the claims or b) if you are using a pointer, allocate the
+// proper memory for it before passing in the overall claims, otherwise you might run into a panic.
 func (p *Parser) ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc) (*Token, error) {
 	token, parts, err := p.ParseUnverified(tokenString, claims)
 	if err != nil {

parser_test.go

@@ -10,8 +10,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/golang-jwt/jwt/v4"
-	"github.com/golang-jwt/jwt/v4/test"
+	"git.internal/re/jwt/v4"
+	"git.internal/re/jwt/v4/test"
 )
 
 var errKeyFuncError error = fmt.Errorf("error loading key")
@@ -42,7 +42,6 @@ func init() {
 	// Load private keys
 	jwtTestRSAPrivateKey = test.LoadRSAPrivateKeyFromDisk("test/sample_key")
 	jwtTestEC256PrivateKey = test.LoadECPrivateKeyFromDisk("test/ec256-private.pem")
-
 }
 
 var jwtTestData = []struct {
@@ -338,11 +337,9 @@ func signToken(claims jwt.Claims, signingMethod jwt.SigningMethod) string {
 }
 
 func TestParser_Parse(t *testing.T) {
-
 	// Iterate over test data set and run tests
 	for _, data := range jwtTestData {
 		t.Run(data.name, func(t *testing.T) {
-
 			// If the token string is blank, use helper function to generate string
 			if data.tokenString == "" {
 				data.tokenString = signToken(data.claims, data.signingMethod)
@@ -352,7 +349,7 @@ func TestParser_Parse(t *testing.T) {
 			var token *jwt.Token
 			var ve *jwt.ValidationError
 			var err error
-			var parser = data.parser
+			parser := data.parser
 			if parser == nil {
 				parser = new(jwt.Parser)
 			}
@@ -404,7 +401,7 @@ func TestParser_Parse(t *testing.T) {
 				if err == nil {
 					t.Errorf("[%v] Expecting error(s). Didn't get one.", data.name)
 				} else {
-					var all = false
+					all := false
 					for _, e := range data.err {
 						all = errors.Is(err, e)
 					}
@@ -429,7 +426,6 @@ func TestParser_Parse(t *testing.T) {
 }
 
 func TestParser_ParseUnverified(t *testing.T) {
-
 	// Iterate over test data set and run tests
 	for _, data := range jwtTestData {
 		// Skip test data, that intentionally contains malformed tokens, as they would lead to an error
@@ -446,7 +442,7 @@ func TestParser_ParseUnverified(t *testing.T) {
 			// Parse the token
 			var token *jwt.Token
 			var err error
-			var parser = data.parser
+			parser := data.parser
 			if parser == nil {
 				parser = new(jwt.Parser)
 			}
@@ -489,6 +485,7 @@ var setPaddingTestData = []struct {
 	tokenString   string
 	claims        jwt.Claims
 	paddedDecode  bool
+	strictDecode  bool
 	signingMethod jwt.SigningMethod
 	keyfunc       jwt.Keyfunc
 	valid         bool
@@ -547,19 +544,108 @@ var setPaddingTestData = []struct {
 		keyfunc:       paddedKeyFunc,
 		valid:         true,
 	},
+	// DecodeStrict tests, DecodePaddingAllowed=false
+	{
+		name: "Validated non-padded token with padding disabled, non-strict decode, non-tweaked signature",
+		tokenString: "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJwYWRkZWRiYXIifQ.bI15h-7mN0f-2diX5I4ErgNQy1uM-rJS5Sz7O0iTWtWSBxY1h6wy8Ywxe5EZTEO6GiIfk7Lk-72Ex-c5aA40QKhPwWB9BJ8O_LfKpezUVBOn0jRItDnVdsk4ccl2zsOVkbA4U4QvdrSbOYMbwoRHzDXfTFpoeMWtn3ez0aENJ8dh4E1echHp5ByI9Pu2aBsvM1WVcMt_BySweCL3f4T7jNZeXDr7Txd00yUd2gdsHYPjXorOvsgaBKN5GLsWd1zIY5z-2gCC8CRSN-IJ4NNX5ifh7l-bOXE2q7szTqa9pvyE9y6TQJhNMSE2FotRce_TOPBWgGpQ-K2I7E8x7wZ8O" +
+			"g",
+		claims:        nil,
+		paddedDecode:  false,
+		strictDecode:  false,
+		signingMethod: jwt.SigningMethodRS256,
+		keyfunc:       defaultKeyFunc,
+		valid:         true,
+	},
+	{
+		name: "Validated non-padded token with padding disabled, non-strict decode, tweaked signature",
+		tokenString: "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJwYWRkZWRiYXIifQ.bI15h-7mN0f-2diX5I4ErgNQy1uM-rJS5Sz7O0iTWtWSBxY1h6wy8Ywxe5EZTEO6GiIfk7Lk-72Ex-c5aA40QKhPwWB9BJ8O_LfKpezUVBOn0jRItDnVdsk4ccl2zsOVkbA4U4QvdrSbOYMbwoRHzDXfTFpoeMWtn3ez0aENJ8dh4E1echHp5ByI9Pu2aBsvM1WVcMt_BySweCL3f4T7jNZeXDr7Txd00yUd2gdsHYPjXorOvsgaBKN5GLsWd1zIY5z-2gCC8CRSN-IJ4NNX5ifh7l-bOXE2q7szTqa9pvyE9y6TQJhNMSE2FotRce_TOPBWgGpQ-K2I7E8x7wZ8O" +
+			"h",
+		claims:        nil,
+		paddedDecode:  false,
+		strictDecode:  false,
+		signingMethod: jwt.SigningMethodRS256,
+		keyfunc:       defaultKeyFunc,
+		valid:         true,
+	},
+	{
+		name: "Validated non-padded token with padding disabled, strict decode, non-tweaked signature",
+		tokenString: "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJwYWRkZWRiYXIifQ.bI15h-7mN0f-2diX5I4ErgNQy1uM-rJS5Sz7O0iTWtWSBxY1h6wy8Ywxe5EZTEO6GiIfk7Lk-72Ex-c5aA40QKhPwWB9BJ8O_LfKpezUVBOn0jRItDnVdsk4ccl2zsOVkbA4U4QvdrSbOYMbwoRHzDXfTFpoeMWtn3ez0aENJ8dh4E1echHp5ByI9Pu2aBsvM1WVcMt_BySweCL3f4T7jNZeXDr7Txd00yUd2gdsHYPjXorOvsgaBKN5GLsWd1zIY5z-2gCC8CRSN-IJ4NNX5ifh7l-bOXE2q7szTqa9pvyE9y6TQJhNMSE2FotRce_TOPBWgGpQ-K2I7E8x7wZ8O" +
+			"g",
+		claims:        nil,
+		paddedDecode:  false,
+		strictDecode:  true,
+		signingMethod: jwt.SigningMethodRS256,
+		keyfunc:       defaultKeyFunc,
+		valid:         true,
+	},
+	{
+		name: "Error for non-padded token with padding disabled, strict decode, tweaked signature",
+		tokenString: "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJwYWRkZWRiYXIifQ.bI15h-7mN0f-2diX5I4ErgNQy1uM-rJS5Sz7O0iTWtWSBxY1h6wy8Ywxe5EZTEO6GiIfk7Lk-72Ex-c5aA40QKhPwWB9BJ8O_LfKpezUVBOn0jRItDnVdsk4ccl2zsOVkbA4U4QvdrSbOYMbwoRHzDXfTFpoeMWtn3ez0aENJ8dh4E1echHp5ByI9Pu2aBsvM1WVcMt_BySweCL3f4T7jNZeXDr7Txd00yUd2gdsHYPjXorOvsgaBKN5GLsWd1zIY5z-2gCC8CRSN-IJ4NNX5ifh7l-bOXE2q7szTqa9pvyE9y6TQJhNMSE2FotRce_TOPBWgGpQ-K2I7E8x7wZ8O" +
+			"h",
+		claims:        nil,
+		paddedDecode:  false,
+		strictDecode:  true,
+		signingMethod: jwt.SigningMethodRS256,
+		keyfunc:       defaultKeyFunc,
+		valid:         false,
+	},
+	// DecodeStrict tests, DecodePaddingAllowed=true
+	{
+		name: "Validated padded token with padding enabled, non-strict decode, non-tweaked signature",
+		tokenString: "eyJ0eXAiOiJKV1QiLCJraWQiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJhbGciOiJFUzI1NiIsImlzcyI6Imh0dHBzOi8vY29nbml0by1pZHAuZXUtd2VzdC0yLmFtYXpvbmF3cy5jb20vIiwiY2xpZW50IjoiN0xUY29QWnJWNDR6ZVg2WUs5VktBcHZPM3EiLCJzaWduZXIiOiJhcm46YXdzOmVsYXN0aWNsb2FkYmFsYW5jaW5nIiwiZXhwIjoxNjI5NDcwMTAxfQ==.eyJzdWIiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJlbWFpbF92ZXJpZmllZCI6InRydWUiLCJlbWFpbCI6InVzZXJAZXhhbXBsZS5jb20iLCJ1c2VybmFtZSI6IjEyMzQ1Njc4LWFiY2QtMTIzNC1hYmNkLTEyMzQ1Njc4YWJjZCIsImV4cCI6MTYyOTQ3MDEwMSwiaXNzIjoiaHR0cHM6Ly9jb2duaXRvLWlkcC5ldS13ZXN0LTIuYW1hem9uYXdzLmNvbS8ifQ==.sx0muJ754glJvwWgkHaPrOI3L1gaPjRLLUvOQRk0WitnqC5Dtt1knorcbOzlEcH9zwPM2jYYIAYQz_qEyM3gr" +
+			"w==",
+		claims:        nil,
+		paddedDecode:  true,
+		strictDecode:  false,
+		signingMethod: jwt.SigningMethodES256,
+		keyfunc:       paddedKeyFunc,
+		valid:         true,
+	},
+	{
+		name: "Validated padded token with padding enabled, non-strict decode, tweaked signature",
+		tokenString: "eyJ0eXAiOiJKV1QiLCJraWQiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJhbGciOiJFUzI1NiIsImlzcyI6Imh0dHBzOi8vY29nbml0by1pZHAuZXUtd2VzdC0yLmFtYXpvbmF3cy5jb20vIiwiY2xpZW50IjoiN0xUY29QWnJWNDR6ZVg2WUs5VktBcHZPM3EiLCJzaWduZXIiOiJhcm46YXdzOmVsYXN0aWNsb2FkYmFsYW5jaW5nIiwiZXhwIjoxNjI5NDcwMTAxfQ==.eyJzdWIiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJlbWFpbF92ZXJpZmllZCI6InRydWUiLCJlbWFpbCI6InVzZXJAZXhhbXBsZS5jb20iLCJ1c2VybmFtZSI6IjEyMzQ1Njc4LWFiY2QtMTIzNC1hYmNkLTEyMzQ1Njc4YWJjZCIsImV4cCI6MTYyOTQ3MDEwMSwiaXNzIjoiaHR0cHM6Ly9jb2duaXRvLWlkcC5ldS13ZXN0LTIuYW1hem9uYXdzLmNvbS8ifQ==.sx0muJ754glJvwWgkHaPrOI3L1gaPjRLLUvOQRk0WitnqC5Dtt1knorcbOzlEcH9zwPM2jYYIAYQz_qEyM3gr" +
+			"x==",
+		claims:        nil,
+		paddedDecode:  true,
+		strictDecode:  false,
+		signingMethod: jwt.SigningMethodES256,
+		keyfunc:       paddedKeyFunc,
+		valid:         true,
+	},
+	{
+		name: "Validated padded token with padding enabled, strict decode, non-tweaked signature",
+		tokenString: "eyJ0eXAiOiJKV1QiLCJraWQiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJhbGciOiJFUzI1NiIsImlzcyI6Imh0dHBzOi8vY29nbml0by1pZHAuZXUtd2VzdC0yLmFtYXpvbmF3cy5jb20vIiwiY2xpZW50IjoiN0xUY29QWnJWNDR6ZVg2WUs5VktBcHZPM3EiLCJzaWduZXIiOiJhcm46YXdzOmVsYXN0aWNsb2FkYmFsYW5jaW5nIiwiZXhwIjoxNjI5NDcwMTAxfQ==.eyJzdWIiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJlbWFpbF92ZXJpZmllZCI6InRydWUiLCJlbWFpbCI6InVzZXJAZXhhbXBsZS5jb20iLCJ1c2VybmFtZSI6IjEyMzQ1Njc4LWFiY2QtMTIzNC1hYmNkLTEyMzQ1Njc4YWJjZCIsImV4cCI6MTYyOTQ3MDEwMSwiaXNzIjoiaHR0cHM6Ly9jb2duaXRvLWlkcC5ldS13ZXN0LTIuYW1hem9uYXdzLmNvbS8ifQ==.sx0muJ754glJvwWgkHaPrOI3L1gaPjRLLUvOQRk0WitnqC5Dtt1knorcbOzlEcH9zwPM2jYYIAYQz_qEyM3gr" +
+			"w==",
+		claims:        nil,
+		paddedDecode:  true,
+		strictDecode:  true,
+		signingMethod: jwt.SigningMethodES256,
+		keyfunc:       paddedKeyFunc,
+		valid:         true,
+	},
+	{
+		name: "Error for padded token with padding enabled, strict decode, tweaked signature",
+		tokenString: "eyJ0eXAiOiJKV1QiLCJraWQiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJhbGciOiJFUzI1NiIsImlzcyI6Imh0dHBzOi8vY29nbml0by1pZHAuZXUtd2VzdC0yLmFtYXpvbmF3cy5jb20vIiwiY2xpZW50IjoiN0xUY29QWnJWNDR6ZVg2WUs5VktBcHZPM3EiLCJzaWduZXIiOiJhcm46YXdzOmVsYXN0aWNsb2FkYmFsYW5jaW5nIiwiZXhwIjoxNjI5NDcwMTAxfQ==.eyJzdWIiOiIxMjM0NTY3OC1hYmNkLTEyMzQtYWJjZC0xMjM0NTY3OGFiY2QiLCJlbWFpbF92ZXJpZmllZCI6InRydWUiLCJlbWFpbCI6InVzZXJAZXhhbXBsZS5jb20iLCJ1c2VybmFtZSI6IjEyMzQ1Njc4LWFiY2QtMTIzNC1hYmNkLTEyMzQ1Njc4YWJjZCIsImV4cCI6MTYyOTQ3MDEwMSwiaXNzIjoiaHR0cHM6Ly9jb2duaXRvLWlkcC5ldS13ZXN0LTIuYW1hem9uYXdzLmNvbS8ifQ==.sx0muJ754glJvwWgkHaPrOI3L1gaPjRLLUvOQRk0WitnqC5Dtt1knorcbOzlEcH9zwPM2jYYIAYQz_qEyM3gr" +
+			"x==",
+		claims:        nil,
+		paddedDecode:  true,
+		strictDecode:  true,
+		signingMethod: jwt.SigningMethodES256,
+		keyfunc:       paddedKeyFunc,
+		valid:         false,
+	},
 }
 
 // Extension of Parsing, this is to test out functionality specific to switching codecs with padding.
 func TestSetPadding(t *testing.T) {
 	for _, data := range setPaddingTestData {
 		t.Run(data.name, func(t *testing.T) {
+			jwt.DecodePaddingAllowed = data.paddedDecode
+			jwt.DecodeStrict = data.strictDecode
 
 			// If the token string is blank, use helper function to generate string
-			jwt.DecodePaddingAllowed = data.paddedDecode
-
 			if data.tokenString == "" {
 				data.tokenString = signToken(data.claims, data.signingMethod)
-
 			}
 
 			// Parse the token
@@ -578,15 +664,13 @@ func TestSetPadding(t *testing.T) {
 					err,
 				)
 			}
-
 		})
 		jwt.DecodePaddingAllowed = false
-
+		jwt.DecodeStrict = false
 	}
 }
 
 func BenchmarkParseUnverified(b *testing.B) {
-
 	// Iterate over test data set and run tests
 	for _, data := range jwtTestData {
 		// If the token string is blank, use helper function to generate string
@@ -595,7 +679,7 @@ func BenchmarkParseUnverified(b *testing.B) {
 		}
 
 		// Parse the token
-		var parser = data.parser
+		parser := data.parser
 		if parser == nil {
 			parser = new(jwt.Parser)
 		}

request/extractor.go

@@ -3,6 +3,7 @@ package request
 import (
 	"errors"
 	"net/http"
+	"strings"
 )
 
 // Errors
@@ -79,3 +80,18 @@ func (e *PostExtractionFilter) ExtractToken(req *http.Request) (string, error) {
 		return "", err
 	}
 }
+
+// BearerExtractor extracts a token from the Authorization header.
+// The header is expected to match the format "Bearer XX", where "XX" is the
+// JWT token.
+type BearerExtractor struct{}
+
+func (e BearerExtractor) ExtractToken(req *http.Request) (string, error) {
+	tokenHeader := req.Header.Get("Authorization")
+	// The usual convention is for "Bearer" to be title-cased. However, there's no
+	// strict rule around this, and it's best to follow the robustness principle here.
+	if tokenHeader == "" || !strings.HasPrefix(strings.ToLower(tokenHeader), "bearer ") {
+		return "", ErrNoTokenInRequest
+	}
+	return tokenHeader[7:], nil
+}

request/extractor_test.go

@@ -89,3 +89,23 @@ func makeExampleRequest(method, path string, headers map[string]string, urlArgs
 	}
 	return r
 }
+
+func TestBearerExtractor(t *testing.T) {
+	request := makeExampleRequest("POST", "https://example.com/", map[string]string{"Authorization": "Bearer ToKen"}, nil)
+	token, err := BearerExtractor{}.ExtractToken(request)
+	if err != nil || token != "ToKen" {
+		t.Errorf("ExtractToken did not return token, returned: %v, %v", token, err)
+	}
+
+	request = makeExampleRequest("POST", "https://example.com/", map[string]string{"Authorization": "Bearo ToKen"}, nil)
+	token, err = BearerExtractor{}.ExtractToken(request)
+	if err == nil || token != "" {
+		t.Errorf("ExtractToken did not return error, returned: %v, %v", token, err)
+	}
+
+	request = makeExampleRequest("POST", "https://example.com/", map[string]string{"Authorization": "BeArEr HeLO"}, nil)
+	token, err = BearerExtractor{}.ExtractToken(request)
+	if err != nil || token != "HeLO" {
+		t.Errorf("ExtractToken did not return token, returned: %v, %v", token, err)
+	}
+}

request/request.go

@@ -3,7 +3,7 @@ package request
 import (
 	"net/http"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 // ParseFromRequest extracts and parses a JWT token from an HTTP request.

request/request_test.go

@@ -8,8 +8,8 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
-	"github.com/golang-jwt/jwt/v4/test"
+	"git.internal/re/jwt/v4"
+	"git.internal/re/jwt/v4/test"
 )
 
 var requestTestData = []struct {

rsa_pss_test.go

@@ -10,8 +10,8 @@ import (
 	"testing"
 	"time"
 
-	"github.com/golang-jwt/jwt/v4"
-	"github.com/golang-jwt/jwt/v4/test"
+	"git.internal/re/jwt/v4"
+	"git.internal/re/jwt/v4/test"
 )
 
 var rsaPSSTestData = []struct {

rsa_test.go

@@ -5,42 +5,37 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 var rsaTestData = []struct {
 	name        string
 	tokenString string
 	alg         string
-	claims      map[string]interface{}
 	valid       bool
 }{
 	{
 		"Basic RS256",
 		"eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJmb28iOiJiYXIifQ.FhkiHkoESI_cG3NPigFrxEk9Z60_oXrOT2vGm9Pn6RDgYNovYORQmmA0zs1AoAOf09ly2Nx2YAg6ABqAYga1AcMFkJljwxTT5fYphTuqpWdy4BELeSYJx5Ty2gmr8e7RonuUztrdD5WfPqLKMm1Ozp_T6zALpRmwTIW0QPnaBXaQD90FplAg46Iy1UlDKr-Eupy0i5SLch5Q-p2ZpaL_5fnTIUDlxC3pWhJTyx_71qDI-mAA_5lE_VdroOeflG56sSmDxopPEG3bFlSu1eowyBfxtu0_CuVd-M42RU75Zc4Gsj6uV77MBtbMrf4_7M_NUTSgoIF3fRqxrj0NzihIBg",
 		"RS256",
-		map[string]interface{}{"foo": "bar"},
 		true,
 	},
 	{
 		"Basic RS384",
 		"eyJhbGciOiJSUzM4NCIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIifQ.W-jEzRfBigtCWsinvVVuldiuilzVdU5ty0MvpLaSaqK9PlAWWlDQ1VIQ_qSKzwL5IXaZkvZFJXT3yL3n7OUVu7zCNJzdwznbC8Z-b0z2lYvcklJYi2VOFRcGbJtXUqgjk2oGsiqUMUMOLP70TTefkpsgqDxbRh9CDUfpOJgW-dU7cmgaoswe3wjUAUi6B6G2YEaiuXC0XScQYSYVKIzgKXJV8Zw-7AN_DBUI4GkTpsvQ9fVVjZM9csQiEXhYekyrKu1nu_POpQonGd8yqkIyXPECNmmqH5jH4sFiF67XhD7_JpkvLziBpI-uh86evBUadmHhb9Otqw3uV3NTaXLzJw",
 		"RS384",
-		map[string]interface{}{"foo": "bar"},
 		true,
 	},
 	{
 		"Basic RS512",
 		"eyJhbGciOiJSUzUxMiIsInR5cCI6IkpXVCJ9.eyJmb28iOiJiYXIifQ.zBlLlmRrUxx4SJPUbV37Q1joRcI9EW13grnKduK3wtYKmDXbgDpF1cZ6B-2Jsm5RB8REmMiLpGms-EjXhgnyh2TSHE-9W2gA_jvshegLWtwRVDX40ODSkTb7OVuaWgiy9y7llvcknFBTIg-FnVPVpXMmeV_pvwQyhaz1SSwSPrDyxEmksz1hq7YONXhXPpGaNbMMeDTNP_1oj8DZaqTIL9TwV8_1wb2Odt_Fy58Ke2RVFijsOLdnyEAjt2n9Mxihu9i3PhNBkkxa2GbnXBfq3kzvZ_xxGGopLdHhJjcGWXO-NiwI9_tiu14NRv4L2xC0ItD9Yz68v2ZIZEp_DuzwRQ",
 		"RS512",
-		map[string]interface{}{"foo": "bar"},
 		true,
 	},
 	{
 		"basic invalid: foo => bar",
 		"eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzI1NiJ9.eyJmb28iOiJiYXIifQ.EhkiHkoESI_cG3NPigFrxEk9Z60_oXrOT2vGm9Pn6RDgYNovYORQmmA0zs1AoAOf09ly2Nx2YAg6ABqAYga1AcMFkJljwxTT5fYphTuqpWdy4BELeSYJx5Ty2gmr8e7RonuUztrdD5WfPqLKMm1Ozp_T6zALpRmwTIW0QPnaBXaQD90FplAg46Iy1UlDKr-Eupy0i5SLch5Q-p2ZpaL_5fnTIUDlxC3pWhJTyx_71qDI-mAA_5lE_VdroOeflG56sSmDxopPEG3bFlSu1eowyBfxtu0_CuVd-M42RU75Zc4Gsj6uV77MBtbMrf4_7M_NUTSgoIF3fRqxrj0NzihIBg",
 		"RS256",
-		map[string]interface{}{"foo": "bar"},
 		false,
 	},
 }
@@ -152,7 +147,6 @@ func TestRSAKeyParsing(t *testing.T) {
 	if k, e := jwt.ParseRSAPublicKeyFromPEM(badKey); e == nil {
 		t.Errorf("Parsed invalid key as valid private key: %v", k)
 	}
-
 }
 
 func BenchmarkRSAParsing(b *testing.B) {

test/helpers.go

@@ -5,7 +5,7 @@ import (
 	"crypto/rsa"
 	"os"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 func LoadRSAPrivateKeyFromDisk(location string) *rsa.PrivateKey {

token.go

@@ -14,6 +14,12 @@ import (
 // To use the non-recommended decoding, set this boolean to `true` prior to using this package.
 var DecodePaddingAllowed bool
 
+// DecodeStrict will switch the codec used for decoding JWTs into strict mode.
+// In this mode, the decoder requires that trailing padding bits are zero, as described in RFC 4648 section 3.5.
+// Note that this is a global variable, and updating it will change the behavior on a package level, and is also NOT go-routine safe.
+// To use strict decoding, set this boolean to `true` prior to using this package.
+var DecodeStrict bool
+
 // TimeFunc provides the current time when parsing token to validate "exp" claim (expiration time).
 // You can override it to use another time value.  This is useful for testing or if your
 // server uses a different time zone than your tokens.
@@ -99,6 +105,11 @@ func Parse(tokenString string, keyFunc Keyfunc, options ...ParserOption) (*Token
 	return NewParser(options...).Parse(tokenString, keyFunc)
 }
 
+// ParseWithClaims is a shortcut for NewParser().ParseWithClaims().
+//
+// Note: If you provide a custom claim implementation that embeds one of the standard claims (such as RegisteredClaims),
+// make sure that a) you either embed a non-pointer version of the claims or b) if you are using a pointer, allocate the
+// proper memory for it before passing in the overall claims, otherwise you might run into a panic.
 func ParseWithClaims(tokenString string, claims Claims, keyFunc Keyfunc, options ...ParserOption) (*Token, error) {
 	return NewParser(options...).ParseWithClaims(tokenString, claims, keyFunc)
 }
@@ -116,12 +127,17 @@ func EncodeSegment(seg []byte) string {
 // Deprecated: In a future release, we will demote this function to a non-exported function, since it
 // should only be used internally
 func DecodeSegment(seg string) ([]byte, error) {
+	encoding := base64.RawURLEncoding
+
 	if DecodePaddingAllowed {
 		if l := len(seg) % 4; l > 0 {
 			seg += strings.Repeat("=", 4-l)
 		}
-		return base64.URLEncoding.DecodeString(seg)
+		encoding = base64.URLEncoding
 	}
 
-	return base64.RawURLEncoding.DecodeString(seg)
+	if DecodeStrict {
+		encoding = encoding.Strict()
+	}
+	return encoding.DecodeString(seg)
 }

token_test.go

@@ -3,7 +3,7 @@ package jwt_test
 import (
 	"testing"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 func TestToken_SigningString(t1 *testing.T) {

types.go

@@ -53,9 +53,23 @@ func (date NumericDate) MarshalJSON() (b []byte, err error) {
 	if TimePrecision < time.Second {
 		prec = int(math.Log10(float64(time.Second) / float64(TimePrecision)))
 	}
-	f := float64(date.Truncate(TimePrecision).UnixNano()) / float64(time.Second)
+	truncatedDate := date.Truncate(TimePrecision)
 
-	return []byte(strconv.FormatFloat(f, 'f', prec, 64)), nil
+	// For very large timestamps, UnixNano would overflow an int64, but this
+	// function requires nanosecond level precision, so we have to use the
+	// following technique to get round the issue:
+	// 1. Take the normal unix timestamp to form the whole number part of the
+	//    output,
+	// 2. Take the result of the Nanosecond function, which retuns the offset
+	//    within the second of the particular unix time instance, to form the
+	//    decimal part of the output
+	// 3. Concatenate them to produce the final result
+	seconds := strconv.FormatInt(truncatedDate.Unix(), 10)
+	nanosecondsOffset := strconv.FormatFloat(float64(truncatedDate.Nanosecond())/float64(time.Second), 'f', prec, 64)
+
+	output := append([]byte(seconds), []byte(nanosecondsOffset)[1:]...)
+
+	return output, nil
 }
 
 // UnmarshalJSON is an implementation of the json.RawMessage interface and deserializses a

types_test.go

@@ -2,10 +2,11 @@ package jwt_test
 
 import (
 	"encoding/json"
+	"math"
 	"testing"
 	"time"
 
-	"github.com/golang-jwt/jwt/v4"
+	"git.internal/re/jwt/v4"
 )
 
 func TestNumericDate(t *testing.T) {
@@ -40,7 +41,6 @@ func TestSingleArrayMarshal(t *testing.T) {
 	expected := `"test"`
 
 	b, err := json.Marshal(s)
-
 	if err != nil {
 		t.Errorf("Unexpected error: %s", err)
 	}
@@ -79,23 +79,38 @@ func TestNumericDate_MarshalJSON(t *testing.T) {
 	}{
 		{time.Unix(5243700879, 0), "5243700879", time.Second},
 		{time.Unix(5243700879, 0), "5243700879.000", time.Millisecond},
-		{time.Unix(5243700879, 0), "5243700879.000001", time.Microsecond},
-		{time.Unix(5243700879, 0), "5243700879.000000954", time.Nanosecond},
+		{time.Unix(5243700879, 0), "5243700879.000000", time.Microsecond},
+		{time.Unix(5243700879, 0), "5243700879.000000000", time.Nanosecond},
 		//
 		{time.Unix(4239425898, 0), "4239425898", time.Second},
 		{time.Unix(4239425898, 0), "4239425898.000", time.Millisecond},
 		{time.Unix(4239425898, 0), "4239425898.000000", time.Microsecond},
 		{time.Unix(4239425898, 0), "4239425898.000000000", time.Nanosecond},
 		//
+		{time.Unix(253402271999, 0), "253402271999", time.Second},
+		{time.Unix(253402271999, 0), "253402271999.000", time.Millisecond},
+		{time.Unix(253402271999, 0), "253402271999.000000", time.Microsecond},
+		{time.Unix(253402271999, 0), "253402271999.000000000", time.Nanosecond},
+		//
 		{time.Unix(0, 1644285000210402000), "1644285000", time.Second},
 		{time.Unix(0, 1644285000210402000), "1644285000.210", time.Millisecond},
 		{time.Unix(0, 1644285000210402000), "1644285000.210402", time.Microsecond},
-		{time.Unix(0, 1644285000210402000), "1644285000.210402012", time.Nanosecond},
+		{time.Unix(0, 1644285000210402000), "1644285000.210402000", time.Nanosecond},
 		//
 		{time.Unix(0, 1644285315063096000), "1644285315", time.Second},
 		{time.Unix(0, 1644285315063096000), "1644285315.063", time.Millisecond},
 		{time.Unix(0, 1644285315063096000), "1644285315.063096", time.Microsecond},
-		{time.Unix(0, 1644285315063096000), "1644285315.063096046", time.Nanosecond},
+		{time.Unix(0, 1644285315063096000), "1644285315.063096000", time.Nanosecond},
+		// Maximum time that a go time.Time can represent
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854775807", time.Second},
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854775807.999", time.Millisecond},
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854775807.999999", time.Microsecond},
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854775807.999999999", time.Nanosecond},
+		// Strange precisions
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854775807", time.Second},
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854775756", time.Minute},
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854774016", time.Hour},
+		{time.Unix(math.MaxInt64, 999999999), "9223372036854745216", 24 * time.Hour},
 	}
 
 	for i, tc := range tt {