Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Add the "X-Amz-Content-Sha256" header #133

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Add the "X-Amz-Content-Sha256" header #133

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
32 changes: 31 additions & 1 deletion aws-es-proxy.go
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,9 @@ package main

import (
"bytes"
"crypto/sha256"
"crypto/subtle"
"encoding/hex"
"encoding/json"
"flag"
"fmt"
Expand Down Expand Up @@ -31,6 +33,8 @@ import (
"golang.org/x/net/publicsuffix"
)

const emptyBodySHA256 = "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824"

func logger(debug bool) {

formatFilePath := func(path string) string {
Expand Down Expand Up @@ -285,8 +289,25 @@ func (p *proxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Start AWS session from ENV, Shared Creds or EC2Role
signer := p.getSigner()

contentSha256Hash := emptyBodySHA256
body := replaceBody(req)

if len(body) > 0 {
hash, err := hexEncodedSha256(body)
if err != nil {
logrus.WithError(err).Errorln("failed to calculate hash of request body: %w", err)
http.Error(w, err.Error(), http.StatusBadRequest)
return
}

contentSha256Hash = hash
}

// Add the "X-Amz-Content-Sha256" header as required by Amazon OpenSearch Serverless.
req.Header.Set("X-Amz-Content-Sha256", contentSha256Hash)

// Sign the request with AWSv4
payload := bytes.NewReader(replaceBody(req))
payload := bytes.NewReader(body)
_, err := signer.Sign(req, payload, p.service, p.region, time.Now())
if err != nil {
p.credentials = nil
Expand Down Expand Up @@ -443,6 +464,15 @@ func addHeaders(src, dest http.Header) {
}
}

func hexEncodedSha256(b []byte) (string, error) {
hasher := sha256.New()
if _, err := hasher.Write(b); err != nil {
return "", fmt.Errorf("failed to write: %w", err)
}
digest := hasher.Sum(nil)
return hex.EncodeToString(digest), nil
}

// Signer.Sign requires a "seekable" body to sum body's sha256
func replaceBody(req *http.Request) []byte {
if req.Body == nil {
Expand Down
6 changes: 3 additions & 3 deletions go.mod
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,13 +3,13 @@ module github.com/abutaha/aws-es-proxy
go 1.20

require (
github.com/aws/aws-sdk-go v1.44.215
github.com/aws/aws-sdk-go v1.47.4
github.com/sirupsen/logrus v1.9.0
go.mongodb.org/mongo-driver v1.11.2
golang.org/x/net v0.8.0
golang.org/x/net v0.17.0
)

require (
github.com/jmespath/go-jmespath v0.4.0 // indirect
golang.org/x/sys v0.6.0 // indirect
golang.org/x/sys v0.13.0 // indirect
)
6 changes: 6 additions & 0 deletions go.sum
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,7 @@
github.com/aws/aws-sdk-go v1.44.215 h1:K3KERfO6MaV349idub2w1u1H0R0KSkED0LshPnaAn3Q=
github.com/aws/aws-sdk-go v1.44.215/go.mod h1:aVsgQcEevwlmQ7qHE9I3h+dtQgpqhFB+i8Phjh7fkwI=
github.com/aws/aws-sdk-go v1.47.4 h1:IyhNbmPt+5ldi5HNzv7ZnXiqSglDMaJiZlzj4Yq3qnk=
github.com/aws/aws-sdk-go v1.47.4/go.mod h1:LF8svs817+Nz+DmiMQKTO3ubZ/6IaTpq3TjupRn3Eqk=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
Expand Down Expand Up @@ -43,6 +45,8 @@ golang.org/x/net v0.0.0-20220722155237-a158d28d115b/go.mod h1:XRhObCWvk6IyKnWLug
golang.org/x/net v0.1.0/go.mod h1:Cx3nUiGt4eDBEyega/BKRp+/AlGL8hYe7U9odMt2Cco=
golang.org/x/net v0.8.0 h1:Zrh2ngAOFYneWTAIAPethzeaQLuHwhuBkuV6ZiRnUaQ=
golang.org/x/net v0.8.0/go.mod h1:QVkue5JL9kW//ek3r6jTKnTFis1tRmNAW2P1shuFdJc=
golang.org/x/net v0.17.0 h1:pVaXccu2ozPjCXewfr1S7xza/zcXTity9cCdXQYSjIM=
golang.org/x/net v0.17.0/go.mod h1:NxSsAGuq816PNPmqtQdLE42eU2Fs7NoRIZrHJAlaCOE=
golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20220722155255-886fb9371eb4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
Expand All @@ -56,6 +60,8 @@ golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBc
golang.org/x/sys v0.1.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/term v0.1.0/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
Expand Down