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Refactor sha1 and time-limited code (#31023)

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Remove "EncodeSha1", it shouldn't be used as a general purpose hasher
(just like we have removed "EncodeMD5" in #28622)

Rewrite the "time-limited code" related code and write better tests, the
old code doesn't seem quite right.
This commit is contained in:
wxiaoguang 2024-05-20 23:12:50 +08:00 committed by GitHub
parent f1d9f18d96
commit fb1ad920b7
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
8 changed files with 120 additions and 96 deletions
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5
models/user/email_address.go
View File

@ -10,6 +10,7 @@ import (
"net/mail"
"regexp"
"strings"
"time"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/base"
@ -353,14 +354,12 @@ func ChangeInactivePrimaryEmail(ctx context.Context, uid int64, oldEmailAddr, ne
// VerifyActiveEmailCode verifies active email code when active account
func VerifyActiveEmailCode(ctx context.Context, code, email string) *EmailAddress {
minutes := setting.Service.ActiveCodeLives
if user := GetVerifyUser(ctx, code); user != nil {
// time limit code
prefix := code[:base.TimeLimitCodeLength]
data := fmt.Sprintf("%d%s%s%s%s", user.ID, email, user.LowerName, user.Passwd, user.Rands)
if base.VerifyTimeLimitCode(data, minutes, prefix) {
if base.VerifyTimeLimitCode(time.Now(), data, setting.Service.ActiveCodeLives, prefix) {
emailAddress := &EmailAddress{UID: user.ID, Email: email}
if has, _ := db.GetEngine(ctx).Get(emailAddress); has {
return emailAddress

7
models/user/user.go
View File

@ -304,7 +304,7 @@ func (u *User) OrganisationLink() string {
func (u *User) GenerateEmailActivateCode(email string) string {
code := base.CreateTimeLimitCode(
fmt.Sprintf("%d%s%s%s%s", u.ID, email, u.LowerName, u.Passwd, u.Rands),
setting.Service.ActiveCodeLives, nil)
setting.Service.ActiveCodeLives, time.Now(), nil)
// Add tail hex username
code += hex.EncodeToString([]byte(u.LowerName))
@ -791,14 +791,11 @@ func GetVerifyUser(ctx context.Context, code string) (user *User) {
// VerifyUserActiveCode verifies active code when active account
func VerifyUserActiveCode(ctx context.Context, code string) (user *User) {
minutes := setting.Service.ActiveCodeLives
if user = GetVerifyUser(ctx, code); user != nil {
// time limit code
prefix := code[:base.TimeLimitCodeLength]
data := fmt.Sprintf("%d%s%s%s%s", user.ID, user.Email, user.LowerName, user.Passwd, user.Rands)
if base.VerifyTimeLimitCode(data, minutes, prefix) {
if base.VerifyTimeLimitCode(time.Now(), data, setting.Service.ActiveCodeLives, prefix) {
return user
}
}

85
modules/base/tool.go
View File

@ -4,12 +4,15 @@
package base
import (
"crypto/hmac"
"crypto/sha1"
"crypto/sha256"
"crypto/subtle"
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"hash"
"os"
"path/filepath"
"runtime"
@ -25,13 +28,6 @@ import (
"github.com/dustin/go-humanize"
)
// EncodeSha1 string to sha1 hex value.
func EncodeSha1(str string) string {
h := sha1.New()
_, _ = h.Write([]byte(str))
return hex.EncodeToString(h.Sum(nil))
}
// EncodeSha256 string to sha256 hex value.
func EncodeSha256(str string) string {
h := sha256.New()
@ -62,63 +58,62 @@ func BasicAuthDecode(encoded string) (string, string, error) {
}
// VerifyTimeLimitCode verify time limit code
func VerifyTimeLimitCode(data string, minutes int, code string) bool {
func VerifyTimeLimitCode(now time.Time, data string, minutes int, code string) bool {
if len(code) <= 18 {
return false
}
// split code
start := code[:12]
lives := code[12:18]
if d, err := strconv.ParseInt(lives, 10, 0); err == nil {
minutes = int(d)
}
startTimeStr := code[:12]
aliveTimeStr := code[12:18]
aliveTime, _ := strconv.Atoi(aliveTimeStr) // no need to check err, if anything wrong, the following code check will fail soon
// right active code
retCode := CreateTimeLimitCode(data, minutes, start)
if retCode == code && minutes > 0 {
// check time is expired or not
before, _ := time.ParseInLocation("200601021504", start, time.Local)
now := time.Now()
if before.Add(time.Minute*time.Duration(minutes)).Unix() > now.Unix() {
return true
// check code
retCode := CreateTimeLimitCode(data, aliveTime, startTimeStr, nil)
if subtle.ConstantTimeCompare([]byte(retCode), []byte(code)) != 1 {
retCode = CreateTimeLimitCode(data, aliveTime, startTimeStr, sha1.New()) // TODO: this is only for the support of legacy codes, remove this in/after 1.23
if subtle.ConstantTimeCompare([]byte(retCode), []byte(code)) != 1 {
return false
}
}
return false
// check time is expired or not: startTime <= now && now < startTime + minutes
startTime, _ := time.ParseInLocation("200601021504", startTimeStr, time.Local)
return (startTime.Before(now) || startTime.Equal(now)) && now.Before(startTime.Add(time.Minute*time.Duration(minutes)))
}
// TimeLimitCodeLength default value for time limit code
const TimeLimitCodeLength = 12 + 6 + 40
// CreateTimeLimitCode create a time limit code
// code format: 12 length date time string + 6 minutes string + 40 sha1 encoded string
func CreateTimeLimitCode(data string, minutes int, startInf any) string {
format := "200601021504"
// CreateTimeLimitCode create a time-limited code.
// Format: 12 length date time string + 6 minutes string (not used) + 40 hash string, some other code depends on this fixed length
// If h is nil, then use the default hmac hash.
func CreateTimeLimitCode[T time.Time | string](data string, minutes int, startTimeGeneric T, h hash.Hash) string {
const format = "200601021504"
var start, end time.Time
var startStr, endStr string
if startInf == nil {
// Use now time create code
start = time.Now()
startStr = start.Format(format)
var start time.Time
var startTimeAny any = startTimeGeneric
if t, ok := startTimeAny.(time.Time); ok {
start = t
} else {
// use start string create code
startStr = startInf.(string)
start, _ = time.ParseInLocation(format, startStr, time.Local)
startStr = start.Format(format)
var err error
start, err = time.ParseInLocation(format, startTimeAny.(string), time.Local)
if err != nil {
return "" // return an invalid code because the "parse" failed
}
}
startStr := start.Format(format)
end := start.Add(time.Minute * time.Duration(minutes))
end = start.Add(time.Minute * time.Duration(minutes))
endStr = end.Format(format)
// create sha1 encode string
sh := sha1.New()
_, _ = sh.Write([]byte(fmt.Sprintf("%s%s%s%s%d", data, hex.EncodeToString(setting.GetGeneralTokenSigningSecret()), startStr, endStr, minutes)))
encoded := hex.EncodeToString(sh.Sum(nil))
if h == nil {
h = hmac.New(sha1.New, setting.GetGeneralTokenSigningSecret())
}
_, _ = fmt.Fprintf(h, "%s%s%s%s%d", data, hex.EncodeToString(setting.GetGeneralTokenSigningSecret()), startStr, end.Format(format), minutes)
encoded := hex.EncodeToString(h.Sum(nil))
code := fmt.Sprintf("%s%06d%s", startStr, minutes, encoded)
if len(code) != TimeLimitCodeLength {
panic("there is a hard requirement for the length of time-limited code") // it shouldn't happen
}
return code
}

89
modules/base/tool_test.go
View File

@ -4,20 +4,18 @@
package base
import (
"crypto/sha1"
"fmt"
"os"
"testing"
"time"
"code.gitea.io/gitea/modules/setting"
"code.gitea.io/gitea/modules/test"
"github.com/stretchr/testify/assert"
)
func TestEncodeSha1(t *testing.T) {
assert.Equal(t,
"8843d7f92416211de9ebb963ff4ce28125932878",
EncodeSha1("foobar"),
)
}
func TestEncodeSha256(t *testing.T) {
assert.Equal(t,
"c3ab8ff13720e8ad9047dd39466b3c8974e592c2fa383d4a3960714caef0c4f2",
@ -46,43 +44,54 @@ func TestBasicAuthDecode(t *testing.T) {
}
func TestVerifyTimeLimitCode(t *testing.T) {
tc := []struct {
data string
minutes int
code string
valid bool
}{{
data: "data",
minutes: 2,
code: testCreateTimeLimitCode(t, "data", 2),
valid: true,
}, {
data: "abc123-ß",
minutes: 1,
code: testCreateTimeLimitCode(t, "abc123-ß", 1),
valid: true,
}, {
data: "data",
minutes: 2,
code: "2021012723240000005928251dac409d2c33a6eb82c63410aaad569bed",
valid: false,
}}
for _, test := range tc {
actualValid := VerifyTimeLimitCode(test.data, test.minutes, test.code)
assert.Equal(t, test.valid, actualValid, "data: '%s' code: '%s' should be valid: %t", test.data, test.code, test.valid)
defer test.MockVariableValue(&setting.InstallLock, true)()
initGeneralSecret := func(secret string) {
setting.InstallLock = true
setting.CfgProvider, _ = setting.NewConfigProviderFromData(fmt.Sprintf(`
[oauth2]
JWT_SECRET = %s
`, secret))
setting.LoadCommonSettings()
}
}
func testCreateTimeLimitCode(t *testing.T, data string, m int) string {
result0 := CreateTimeLimitCode(data, m, nil)
result1 := CreateTimeLimitCode(data, m, time.Now().Format("200601021504"))
result2 := CreateTimeLimitCode(data, m, time.Unix(time.Now().Unix()+int64(time.Minute)*int64(m), 0).Format("200601021504"))
initGeneralSecret("KZb_QLUd4fYVyxetjxC4eZkrBgWM2SndOOWDNtgUUko")
now := time.Now()
assert.Equal(t, result0, result1)
assert.NotEqual(t, result0, result2)
t.Run("TestGenericParameter", func(t *testing.T) {
time2000 := time.Date(2000, 1, 2, 3, 4, 5, 0, time.Local)
assert.Equal(t, "2000010203040000026fa5221b2731b7cf80b1b506f5e39e38c115fee5", CreateTimeLimitCode("test-sha1", 2, time2000, sha1.New()))
assert.Equal(t, "2000010203040000026fa5221b2731b7cf80b1b506f5e39e38c115fee5", CreateTimeLimitCode("test-sha1", 2, "200001020304", sha1.New()))
assert.Equal(t, "2000010203040000024842227a2f87041ff82025199c0187410a9297bf", CreateTimeLimitCode("test-hmac", 2, time2000, nil))
assert.Equal(t, "2000010203040000024842227a2f87041ff82025199c0187410a9297bf", CreateTimeLimitCode("test-hmac", 2, "200001020304", nil))
})
assert.True(t, len(result0) != 0)
return result0
t.Run("TestInvalidCode", func(t *testing.T) {
assert.False(t, VerifyTimeLimitCode(now, "data", 2, ""))
assert.False(t, VerifyTimeLimitCode(now, "data", 2, "invalid code"))
})
t.Run("TestCreateAndVerify", func(t *testing.T) {
code := CreateTimeLimitCode("data", 2, now, nil)
assert.False(t, VerifyTimeLimitCode(now.Add(-time.Minute), "data", 2, code)) // not started yet
assert.True(t, VerifyTimeLimitCode(now, "data", 2, code))
assert.True(t, VerifyTimeLimitCode(now.Add(time.Minute), "data", 2, code))
assert.False(t, VerifyTimeLimitCode(now.Add(time.Minute), "DATA", 2, code)) // invalid data
assert.False(t, VerifyTimeLimitCode(now.Add(2*time.Minute), "data", 2, code)) // expired
})
t.Run("TestDifferentSecret", func(t *testing.T) {
// use another secret to ensure the code is invalid for different secret
verifyDataCode := func(c string) bool {
return VerifyTimeLimitCode(now, "data", 2, c)
}
code1 := CreateTimeLimitCode("data", 2, now, sha1.New())
code2 := CreateTimeLimitCode("data", 2, now, nil)
assert.True(t, verifyDataCode(code1))
assert.True(t, verifyDataCode(code2))
initGeneralSecret("000_QLUd4fYVyxetjxC4eZkrBgWM2SndOOWDNtgUUko")
assert.False(t, verifyDataCode(code1))
assert.False(t, verifyDataCode(code2))
})
}
func TestFileSize(t *testing.T) {

8
modules/git/utils.go
View File

@ -4,6 +4,8 @@
package git
import (
"crypto/sha1"
"encoding/hex"
"fmt"
"io"
"os"
@ -128,3 +130,9 @@ func (l *LimitedReaderCloser) Read(p []byte) (n int, err error) {
func (l *LimitedReaderCloser) Close() error {
return l.C.Close()
}
func HashFilePathForWebUI(s string) string {
h := sha1.New()
_, _ = h.Write([]byte(s))
return hex.EncodeToString(h.Sum(nil))
}

17
modules/git/utils_test.go Normal file
View File

@ -0,0 +1,17 @@
// Copyright 2024 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package git
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestHashFilePathForWebUI(t *testing.T) {
assert.Equal(t,
"8843d7f92416211de9ebb963ff4ce28125932878",
HashFilePathForWebUI("foobar"),
)
}

2
routers/web/repo/compare.go
View File

@ -931,7 +931,7 @@ func ExcerptBlob(ctx *context.Context) {
}
}
ctx.Data["section"] = section
ctx.Data["FileNameHash"] = base.EncodeSha1(filePath)
ctx.Data["FileNameHash"] = git.HashFilePathForWebUI(filePath)
ctx.Data["AfterCommitID"] = commitID
ctx.Data["Anchor"] = anchor
ctx.HTML(http.StatusOK, tplBlobExcerpt)

3
services/gitdiff/gitdiff.go
View File

@ -23,7 +23,6 @@ import (
pull_model "code.gitea.io/gitea/models/pull"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/analyze"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/charset"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/highlight"
@ -746,7 +745,7 @@ parsingLoop:
diffLineTypeBuffers[DiffLineAdd] = new(bytes.Buffer)
diffLineTypeBuffers[DiffLineDel] = new(bytes.Buffer)
for _, f := range diff.Files {
f.NameHash = base.EncodeSha1(f.Name)
f.NameHash = git.HashFilePathForWebUI(f.Name)
for _, buffer := range diffLineTypeBuffers {
buffer.Reset()