forgejo-federation/routers/api/packages/chef/auth.go

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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package chef
import (
"context"
"crypto"
"crypto/rsa"
"crypto/sha1"
[GITEA] Drop sha256-simd in favor of stdlib - In Go 1.21 the crypto/sha256 [got a massive improvement](https://go.dev/doc/go1.21#crypto/sha256) by utilizing the SHA instructions for AMD64 CPUs, which sha256-simd already was doing. The performance is now on par and I think it's preferable to use the standard library rather than a package when possible. ``` cpu: AMD Ryzen 5 3600X 6-Core Processor │ simd.txt │ go.txt │ │ sec/op │ sec/op vs base │ Hash/8Bytes-12 63.25n ± 1% 73.38n ± 1% +16.02% (p=0.002 n=6) Hash/64Bytes-12 98.73n ± 1% 105.30n ± 1% +6.65% (p=0.002 n=6) Hash/1K-12 567.2n ± 1% 572.8n ± 1% +0.99% (p=0.002 n=6) Hash/8K-12 4.062µ ± 1% 4.062µ ± 1% ~ (p=0.396 n=6) Hash/1M-12 512.1µ ± 0% 510.6µ ± 1% ~ (p=0.485 n=6) Hash/5M-12 2.556m ± 1% 2.564m ± 0% ~ (p=0.093 n=6) Hash/10M-12 5.112m ± 0% 5.127m ± 0% ~ (p=0.093 n=6) geomean 13.82µ 14.27µ +3.28% │ simd.txt │ go.txt │ │ B/s │ B/s vs base │ Hash/8Bytes-12 120.6Mi ± 1% 104.0Mi ± 1% -13.81% (p=0.002 n=6) Hash/64Bytes-12 618.2Mi ± 1% 579.8Mi ± 1% -6.22% (p=0.002 n=6) Hash/1K-12 1.682Gi ± 1% 1.665Gi ± 1% -0.98% (p=0.002 n=6) Hash/8K-12 1.878Gi ± 1% 1.878Gi ± 1% ~ (p=0.310 n=6) Hash/1M-12 1.907Gi ± 0% 1.913Gi ± 1% ~ (p=0.485 n=6) Hash/5M-12 1.911Gi ± 1% 1.904Gi ± 0% ~ (p=0.093 n=6) Hash/10M-12 1.910Gi ± 0% 1.905Gi ± 0% ~ (p=0.093 n=6) geomean 1.066Gi 1.032Gi -3.18% ``` (cherry picked from commit abd94ff5b59c86e793fd9bf12187ea6cfd1f3fa1) (cherry picked from commit 15e81637abf70576a564cf9eecaa9640228afb5b) Conflicts: go.mod https://codeberg.org/forgejo/forgejo/pulls/1581 (cherry picked from commit 325d92917f655c999b81b08832ee623d6b669f0f) Conflicts: modules/context/context_cookie.go https://codeberg.org/forgejo/forgejo/pulls/1617 (cherry picked from commit 358819e8959886faa171ac16541097500d0a703e) (cherry picked from commit 362fd7aae17832fa922fa017794bc564ca43060d) (cherry picked from commit 4f64ee294ee05c93042b6ec68f0a179ec249dab9) (cherry picked from commit 4bde77f7b13c5f961c141c01b6da1f9eda5ec387) (cherry picked from commit 1311e30a811675eb623692349e4e808a85aabef6) (cherry picked from commit 57b69e334c2973118488b9b5dbdc8a2c88135756) (cherry picked from commit 52dc892fadecf39e89c3c351edc9efb42522257b) (cherry picked from commit 77f54f4187869c6eabcc837742fd3f908093a76c) (cherry picked from commit 0d0392f3a510ce3683bb649dee1e65b45dd91354) Conflicts: go.mod https://codeberg.org/forgejo/forgejo/pulls/2034 (cherry picked from commit 92798364e8fe3188a2100b54f3adea943f8309e9) (cherry picked from commit 43d218127752aa9251c4c3ef71b9c060f109dffc) (cherry picked from commit 45c88b86a35729fc0b2dc6b72bc33caf9f69265f) (cherry picked from commit a1cd6f4e3a7956773cbc0aef8abb80d17b62eb49) (cherry picked from commit 01191dc2adf8c57ae448be37e73158005a8ff74d) (cherry picked from commit 151e07f37e2854ad633f1352fb0ce3cd06f4b2ae)
2023-09-30 04:15:31 +05:30
"crypto/sha256"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
"hash"
"math/big"
"net/http"
"path"
"regexp"
"slices"
"strconv"
"strings"
"time"
user_model "code.gitea.io/gitea/models/user"
chef_module "code.gitea.io/gitea/modules/packages/chef"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/services/auth"
)
const (
maxTimeDifference = 10 * time.Minute
)
var (
algorithmPattern = regexp.MustCompile(`algorithm=(\w+)`)
versionPattern = regexp.MustCompile(`version=(\d+\.\d+)`)
authorizationPattern = regexp.MustCompile(`\AX-Ops-Authorization-(\d+)`)
_ auth.Method = &Auth{}
)
// Documentation:
// https://docs.chef.io/server/api_chef_server/#required-headers
// https://github.com/chef-boneyard/chef-rfc/blob/master/rfc065-sign-v1.3.md
// https://github.com/chef/mixlib-authentication/blob/bc8adbef833d4be23dc78cb23e6fe44b51ebc34f/lib/mixlib/authentication/signedheaderauth.rb
type Auth struct{}
func (a *Auth) Name() string {
return "chef"
}
// Verify extracts the user from the signed request
// If the request is signed with the user private key the user is verified.
func (a *Auth) Verify(req *http.Request, w http.ResponseWriter, store auth.DataStore, sess auth.SessionStore) (*user_model.User, error) {
u, err := getUserFromRequest(req)
if err != nil {
return nil, err
}
if u == nil {
return nil, nil
}
pub, err := getUserPublicKey(req.Context(), u)
if err != nil {
return nil, err
}
if err := verifyTimestamp(req); err != nil {
return nil, err
}
version, err := getSignVersion(req)
if err != nil {
return nil, err
}
if err := verifySignedHeaders(req, version, pub.(*rsa.PublicKey)); err != nil {
return nil, err
}
return u, nil
}
func getUserFromRequest(req *http.Request) (*user_model.User, error) {
username := req.Header.Get("X-Ops-Userid")
if username == "" {
return nil, nil
}
return user_model.GetUserByName(req.Context(), username)
}
func getUserPublicKey(ctx context.Context, u *user_model.User) (crypto.PublicKey, error) {
pubKey, err := user_model.GetSetting(ctx, u.ID, chef_module.SettingPublicPem)
if err != nil {
return nil, err
}
pubPem, _ := pem.Decode([]byte(pubKey))
return x509.ParsePKIXPublicKey(pubPem.Bytes)
}
func verifyTimestamp(req *http.Request) error {
hdr := req.Header.Get("X-Ops-Timestamp")
if hdr == "" {
return util.NewInvalidArgumentErrorf("X-Ops-Timestamp header missing")
}
ts, err := time.Parse(time.RFC3339, hdr)
if err != nil {
return err
}
diff := time.Now().UTC().Sub(ts)
if diff < 0 {
diff = -diff
}
if diff > maxTimeDifference {
return fmt.Errorf("time difference")
}
return nil
}
func getSignVersion(req *http.Request) (string, error) {
hdr := req.Header.Get("X-Ops-Sign")
if hdr == "" {
return "", util.NewInvalidArgumentErrorf("X-Ops-Sign header missing")
}
m := versionPattern.FindStringSubmatch(hdr)
if len(m) != 2 {
return "", util.NewInvalidArgumentErrorf("invalid X-Ops-Sign header")
}
switch m[1] {
case "1.0", "1.1", "1.2", "1.3":
default:
return "", util.NewInvalidArgumentErrorf("unsupported version")
}
version := m[1]
m = algorithmPattern.FindStringSubmatch(hdr)
if len(m) == 2 && m[1] != "sha1" && !(m[1] == "sha256" && version == "1.3") {
return "", util.NewInvalidArgumentErrorf("unsupported algorithm")
}
return version, nil
}
func verifySignedHeaders(req *http.Request, version string, pub *rsa.PublicKey) error {
authorizationData, err := getAuthorizationData(req)
if err != nil {
return err
}
checkData := buildCheckData(req, version)
switch version {
case "1.3":
return verifyDataNew(authorizationData, checkData, pub, crypto.SHA256)
case "1.2":
return verifyDataNew(authorizationData, checkData, pub, crypto.SHA1)
default:
return verifyDataOld(authorizationData, checkData, pub)
}
}
func getAuthorizationData(req *http.Request) ([]byte, error) {
valueList := make(map[int]string)
for k, vs := range req.Header {
if m := authorizationPattern.FindStringSubmatch(k); m != nil {
index, _ := strconv.Atoi(m[1])
var v string
if len(vs) == 0 {
v = ""
} else {
v = vs[0]
}
valueList[index] = v
}
}
tmp := make([]string, len(valueList))
for k, v := range valueList {
if k > len(tmp) {
return nil, fmt.Errorf("invalid X-Ops-Authorization headers")
}
tmp[k-1] = v
}
return base64.StdEncoding.DecodeString(strings.Join(tmp, ""))
}
func buildCheckData(req *http.Request, version string) []byte {
username := req.Header.Get("X-Ops-Userid")
if version != "1.0" && version != "1.3" {
sum := sha1.Sum([]byte(username))
username = base64.StdEncoding.EncodeToString(sum[:])
}
var data string
if version == "1.3" {
data = fmt.Sprintf(
"Method:%s\nPath:%s\nX-Ops-Content-Hash:%s\nX-Ops-Sign:version=%s\nX-Ops-Timestamp:%s\nX-Ops-UserId:%s\nX-Ops-Server-API-Version:%s",
req.Method,
path.Clean(req.URL.Path),
req.Header.Get("X-Ops-Content-Hash"),
version,
req.Header.Get("X-Ops-Timestamp"),
username,
req.Header.Get("X-Ops-Server-Api-Version"),
)
} else {
sum := sha1.Sum([]byte(path.Clean(req.URL.Path)))
data = fmt.Sprintf(
"Method:%s\nHashed Path:%s\nX-Ops-Content-Hash:%s\nX-Ops-Timestamp:%s\nX-Ops-UserId:%s",
req.Method,
base64.StdEncoding.EncodeToString(sum[:]),
req.Header.Get("X-Ops-Content-Hash"),
req.Header.Get("X-Ops-Timestamp"),
username,
)
}
return []byte(data)
}
func verifyDataNew(signature, data []byte, pub *rsa.PublicKey, algo crypto.Hash) error {
var h hash.Hash
if algo == crypto.SHA256 {
h = sha256.New()
} else {
h = sha1.New()
}
if _, err := h.Write(data); err != nil {
return err
}
return rsa.VerifyPKCS1v15(pub, algo, h.Sum(nil), signature)
}
func verifyDataOld(signature, data []byte, pub *rsa.PublicKey) error {
c := new(big.Int)
m := new(big.Int)
m.SetBytes(signature)
e := big.NewInt(int64(pub.E))
c.Exp(m, e, pub.N)
out := c.Bytes()
skip := 0
for i := 2; i < len(out); i++ {
if i+1 >= len(out) {
break
}
if out[i] == 0xFF && out[i+1] == 0 {
skip = i + 2
break
}
}
if !slices.Equal(out[skip:], data) {
return fmt.Errorf("could not verify signature")
}
return nil
}