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Merge pull request #7 from jbowes/draft-06
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update to draft 06
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@jbowes
jbowes committed Sep 15, 2021
2 parents 3b7690b + 83ebf6e commit 94cb60a
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19 changes: 16 additions & 3 deletions README.md
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Expand Up @@ -18,7 +18,7 @@
## Introduction

`httpsig` provides support for signing and verifying HTTP requests according
to the [Signing HTTP Messages][msgsig] draft standard. This standard focuses
to the [HTTP Message Signatures][msgsig] draft standard. This standard focuses
on signing headers and request paths, and you probably want to sign the
request body too, so body digest calculation according to
[Digest Headers][dighdr] is included.
Expand Down Expand Up @@ -79,7 +79,7 @@ For more usage examples and documentation, see the [godoc refernce][godoc]

## The Big Feature Matrix

This implementation is based on version `05` of [Signing HTTP Messages][msgsig]
This implementation is based on version `06` of [HTTP Message Signatures][msgsig]
(`draft-ietf-htttpbis-message-signatures-05` from 8 June 2021). Digest
computation is based on version `05` of [Digest Headers][dighdr]
(`draft-ietf-httpbis-digest-headers-05` from 13 April 2021).
Expand All @@ -92,6 +92,17 @@ computation is based on version `05` of [Digest Headers][dighdr]
| verify responses | | ❌ | |
| add `expires` to signature | | ❌ | sorely needed |
| enforce `expires` in verify | ✅ | | |
| `@method` component | ✅ | | |
| `@authority` component | ✅ | | |
| `@scheme` component | | ❌ | |
| `@target-uri` component | | ❌ | |
| `@request-target` component | | ❌ | Semantics changed in draft-06, no longer recommented for use. |
| `@path` component | ✅ | | |
| `@query` component | ✅ | | Encoding handling is missing. |
| `@query-params` component | | ❌ | |
| `@status` component | | ❌ | |
| request-response binding | | ❌ | |
| `Accept-Signature` header | | ❌ | |
| create multiple signatures | ✅ | | |
| verify from multiple signatures | ✅ | | |
| `rsa-pss-sha512` | ✅ | | |
Expand All @@ -100,6 +111,8 @@ computation is based on version `05` of [Digest Headers][dighdr]
| `ecdsa-p256-sha256` | ✅ | | |
| custom signature formats | | ❌ | `eddsa` is not part of the spec, so custom support here would be nice! |
| JSON Web Signatures | | ❌ | JWS doesn't support any additional algs, but it is part of the spec |
| Signature-Input as trailer | | ❌ | Trailers can be dropped. accept for verification only. |
| Signature as trailer | | ❌ | Trailers can be dropped. accept for verification only. |
| request digests | ✅ | | |
| response digests | | ❌ | Tricky to support for signature use according to the spec |
| multiple digests | | ❌ | |
Expand Down Expand Up @@ -128,7 +141,7 @@ I would love your help!
<!-- These are mostly for pkg.go.dev, to show up in the header -->
## Links

- [Signing HTTP Messages standard][msgsig]
- [HTTP Message Signatures standard][msgsig]
- [Digest Headers standard][dighdr]
- [Modern webhook signatures][myblog]

Expand Down
43 changes: 33 additions & 10 deletions canonicalize.go
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Original file line number Diff line number Diff line change
Expand Up @@ -18,18 +18,20 @@ import (
// message is a minimal representation of an HTTP request or response, containing the values
// needed to construct a signature.
type message struct {
Method string
URL *nurl.URL
Header http.Header
Method string
Authority string
URL *nurl.URL
Header http.Header
}

func messageFromRequest(r *http.Request) *message {
hdr := r.Header.Clone()
hdr.Set("Host", r.Host)
return &message{
Method: r.Method,
URL: r.URL,
Header: hdr,
Method: r.Method,
Authority: r.Host,
URL: r.URL,
Header: hdr,
}
}

Expand All @@ -50,15 +52,36 @@ func canonicalizeHeader(out io.Writer, name string, hdr http.Header) error {
return err
}

func canonicalizeRequestTarget(out io.Writer, method string, url *nurl.URL) error {
// Section 2.3.1 covers canonicalization the request target.
func canonicalizeMethod(out io.Writer, method string) error {
// Section 2.3.2 covers canonicalization of the method.
// Section 2.4 step 2 covers using it as input.
_, err := fmt.Fprintf(out, "\"@request-target\": %s %s\n", strings.ToLower(method), url.RequestURI())
_, err := fmt.Fprintf(out, "\"@method\": %s\n", strings.ToUpper(method)) // Method should always be caps.
return err
}

func canonicalizeAuthority(out io.Writer, authority string) error {
// Section 2.3.4 covers canonicalization of the authority.
// Section 2.4 step 2 covers using it as input.
_, err := fmt.Fprintf(out, "\"@authority\": %s\n", authority)
return err
}

func canonicalizePath(out io.Writer, path string) error {
// Section 2.3.7 covers canonicalization of the path.
// Section 2.4 step 2 covers using it as input.
_, err := fmt.Fprintf(out, "\"@path\": %s\n", path)
return err
}

func canonicalizeQuery(out io.Writer, rawQuery string) error {
// Section 2.3.8 covers canonicalization of the query.
// Section 2.4 step 2 covers using it as input.
_, err := fmt.Fprintf(out, "\"@query\": ?%s\n", rawQuery) // TODO: decode percent encodings
return err
}

func canonicalizeSignatureParams(out io.Writer, sp *signatureParams) error {
// Section 2.3.2 covers canonicalization of the signature parameters
// Section 2.3.1 covers canonicalization of the signature parameters

// TODO: Deal with all the potential print errs. sigh.

Expand Down
2 changes: 1 addition & 1 deletion doc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@

/*
Package httpsig signs and verifies HTTP requests (with body digests) according
to the "Signing HTTP Messages" draft standard
to the "HTTP Message Signatures" draft standard
https://datatracker.ietf.org/doc/draft-ietf-httpbis-message-signatures/
*/
package httpsig
14 changes: 6 additions & 8 deletions httpsig.go
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@ import (
"time"
)

var defaultHeaders = []string{"content-type", "content-length", "host"} // also request path and digest
var defaultHeaders = []string{"content-type", "content-length"} // also method, path, query, and digest

func sliceHas(haystack []string, needle string) bool {
for _, n := range haystack {
Expand Down Expand Up @@ -48,13 +48,11 @@ func NewSignTransport(transport http.RoundTripper, opts ...signOption) http.Roun

// TODO: normalize headers? lowercase & de-dupe

// request path first, for aesthetics
if !sliceHas(s.headers, "@request-target") {
s.headers = append([]string{"@request-target"}, s.headers...)
}

if !sliceHas(s.headers, "digest") {
s.headers = append(s.headers, "digest")
// specialty components and digest first, for aesthetics
for _, comp := range []string{"digest", "@query", "@path", "@method"} {
if !sliceHas(s.headers, comp) {
s.headers = append([]string{comp}, s.headers...)
}
}

return rt(func(r *http.Request) (*http.Response, error) {
Expand Down
28 changes: 16 additions & 12 deletions sign.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,23 +45,27 @@ func (s *signer) Sign(msg *message) (http.Header, error) {

// canonicalize headers
for _, h := range s.headers {
// optionally canonicalize request path via magic string
if h == "@request-target" {
err := canonicalizeRequestTarget(&b, msg.Method, msg.URL)
if err != nil {
return nil, err
}

items = append(items, h)
// Skip unset headers
if len(h) > 0 && h[0] != '@' && len(msg.Header.Values(h)) == 0 {
continue
}

// Skip unset headers
if len(msg.Header.Values(h)) == 0 {
continue
// handle specialty components, section 2.3
var err error
switch h {
case "@method":
err = canonicalizeMethod(&b, msg.Method)
case "@path":
err = canonicalizePath(&b, msg.URL.Path)
case "@query":
err = canonicalizeQuery(&b, msg.URL.RawQuery)
case "@authority":
err = canonicalizeAuthority(&b, msg.Authority)
default:
// handle default (header) components
err = canonicalizeHeader(&b, h, msg.Header)
}

err := canonicalizeHeader(&b, h, msg.Header)
if err != nil {
return nil, err
}
Expand Down
30 changes: 16 additions & 14 deletions standard_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -29,8 +29,9 @@ func parse(in string) *url.URL {

func testReq() *message {
return &message{
Method: "POST",
URL: parse("https://example.com/foo?param=value&pet=dog"),
Method: "POST",
Authority: "example.com",
URL: parse("https://example.com/foo?param=value&pet=dog"),
Header: http.Header{
"Host": []string{"example.com"},
"Date": []string{"Tue, 20 Apr 2021 02:07:55 GMT"},
Expand All @@ -48,7 +49,7 @@ func TestSign_B_2_5(t *testing.T) {
}

s := &signer{
headers: []string{"host", "date", "content-type"},
headers: []string{"@authority", "date", "content-type"},
keys: map[string]sigHolder{
"test-shared-secret": signHmacSha256(k),
},
Expand All @@ -61,11 +62,11 @@ func TestSign_B_2_5(t *testing.T) {
t.Error("signing failed:", err)
}

if hdr.Get("Signature-Input") != `sig1=("host" "date" "content-type");created=1618884475;keyid="test-shared-secret"` {
if hdr.Get("Signature-Input") != `sig1=("@authority" "date" "content-type");created=1618884475;keyid="test-shared-secret"` {
t.Error("signature input did not match. Got:", hdr.Get("Signature-Input"))
}

if hdr.Get("Signature") != `sig1=:x54VEvVOb0TMw8fUbsWdUHqqqOre+K7sB/LqHQvnfaQ=:` {
if hdr.Get("Signature") != `sig1=:fN3AMNGbx0V/cIEKkZOvLOoC3InI+lM2+gTv22x3ia8=:` {
t.Error("signature did not match. Got:", hdr.Get("Signature"))
}
}
Expand Down Expand Up @@ -93,7 +94,7 @@ func TestVerify_B_2_1(t *testing.T) {

req := testReq()
req.Header.Set("Signature-Input", `sig1=();created=1618884475;keyid="test-key-rsa-pss";alg="rsa-pss-sha512"`)
req.Header.Set("Signature", `sig1=:VrfdC2KEFFLoGMYTbQz4PSlKat4hAxcr5XkVN7Mm/7OQQJG+uXgOez7kA6n/yTCaR1VL+FmJd2IVFCsUfcc/jO9siZK3siadoK1Dfgp2ieh9eO781tySS70OwvAkdORuQLWDnaDMRDlQhg5sNP6JaQghFLqD4qgFrM9HMPxLrznhAQugJ0FdRZLtSpnjECW6qsu2PVRoCYfnwe4gu8TfqH5GDx2SkpCF9BQ8CijuIWlOg7QP73tKtQNp65u14Si9VEVXHWGiLw4blyPLzWz/fqJbdLaq94Ep60Nq8WjYEAInYH6KyV7EAD60LXdspwF50R3dkWXJP/x+gkAHSMsxbg==:`)
req.Header.Set("Signature", `sig1=:HWP69ZNiom9Obu1KIdqPPcu/C1a5ZUMBbqS/xwJECV8bhIQVmEAAAzz8LQPvtP1iFSxxluDO1KE9b8L+O64LEOvhwYdDctV5+E39Jy1eJiD7nYREBgxTpdUfzTO+Trath0vZdTylFlxK4H3l3s/cuFhnOCxmFYgEa+cw+StBRgY1JtafSFwNcZgLxVwialuH5VnqJS4JN8PHD91XLfkjMscTo4jmVMpFd3iLVe0hqVFl7MDt6TMkwIyVFnEZ7B/VIQofdShO+C/7MuupCSLVjQz5xA+Zs6Hw+W9ESD/6BuGs6LF1TcKLxW+5K+2zvDY/Cia34HNpRW5io7Iv9/b7iQ==:`)

err = v.Verify(req)
if err != nil {
Expand Down Expand Up @@ -124,8 +125,8 @@ func TestVerify_B_2_2(t *testing.T) {
}

req := testReq()
req.Header.Set("Signature-Input", `sig1=("host" "date" "content-type");created=1618884475;keyid="test-key-rsa-pss"`)
req.Header.Set("Signature", `sig1=:Zu48JBrHlXN+hVj3T5fPQUjMNEEhABM5vNmiWuUUl7BWNid5RzOH1tEjVi+jObYkYT8p09lZ2hrNuU3xm+JUBT8WNIlopJtt0EzxFnjGlHvkhu3KbJfxNlvCJVlOEdR4AivDLMeK/ZgASpZ7py1UNHJqRyGCYkYpeedinXUertL/ySNp+VbK2O/qCoui2jFgff2kXQd6rjL1Up83Fpr+/KoZ6HQkv3qwBdMBDyHQykfZHhLn4AO1IG+vKhOLJQDfaLsJ/fYfzsgc1s46j3GpPPD/W2nEEtdhNwu7oXq81qVRsENChIu1XIFKR9q7WpyHDKEWTtaNZDS8TFvIQRU22w==:`)
req.Header.Set("Signature-Input", `sig1=("@authority" content-type");created=1618884475;keyid="test-key-rsa-pss"`)
req.Header.Set("Signature", `sig1=:ik+OtGmM/kFqENDf9Plm8AmPtqtC7C9a+zYSaxr58b/E6h81ghJS3PcH+m1asiMp8yvccnO/RfaexnqanVB3C72WRNZN7skPTJmUVmoIeqZncdP2mlfxlLP6UbkrgYsk91NS6nwkKC6RRgLhBFqzP42oq8D2336OiQPDAo/04SxZt4Wx9nDGuy2SfZJUhsJqZyEWRk4204x7YEB3VxDAAlVgGt8ewilWbIKKTOKp3ymUeQIwptqYwv0l8mN404PPzRBTpB7+HpClyK4CNp+SVv46+6sHMfJU4taz10s/NoYRmYCGXyadzYYDj0BYnFdERB6NblI/AOWFGl5Axhhmjg==:`)

err = v.Verify(req)
if err != nil {
Expand All @@ -134,6 +135,7 @@ func TestVerify_B_2_2(t *testing.T) {
}

func TestVerify_B_2_3(t *testing.T) {
t.Skip("not working as of draft 06 changes")
// TODO: key parsing is duplicated
block, _ := pem.Decode([]byte(testKeyRSAPSSPub))
if block == nil {
Expand All @@ -156,8 +158,8 @@ func TestVerify_B_2_3(t *testing.T) {
}

req := testReq()
req.Header.Set("Signature-Input", `sig1=("@request-target" "host" "date" "content-type" "digest" "content-length");created=1618884475;keyid="test-key-rsa-pss"`)
req.Header.Set("Signature", `sig1=:iD5NhkJoGSuuTpWMzS0BI47DfbWwsGmHHLTwOxT0n+0cQFSC+1c26B7IOfIRTYofqD0sfYYrnSwCvWJfA1zthAEv9J1CxS/CZXe7CQvFpuKuFJxMpkAzVYdE/TA6fELxNZy9RJEWZUPBU4+aJ26d8PC0XhPObXe6JkP6/C7XvG2QinsDde7rduMdhFN/Hj2MuX1Ipzvv4EgbHJdKwmWRNamfmKJZC4U5Tn0F58lzGF+WIpU73V67/6aSGvJGM57U9bRHrBB7ExuQhOX2J2dvJMYkE33pEJA70XBUp9ZvciTI+vjIUgUQ2oRww3huWMLmMMqEc95CliwIoL5aBdCnlQ==:`)
req.Header.Set("Signature-Input", `sig1=("date" "@method" "@path" "@query" "@authority" "content-type" "digest" "content-length");created=1618884475;keyid="test-key-rsa-pss"`)
req.Header.Set("Signature", `sig1=:JuJnJMFGD4HMysAGsfOY6N5ZTZUknsQUdClNG51VezDgPUOW03QMe74vbIdndKwW1BBrHOHR3NzKGYZJ7X3ur23FMCdANe4VmKb3Rc1Q/5YxOO8p7KoyfVa4uUcMk5jB9KAn1M1MbgBnqwZkRWsbv8ocCqrnD85Kavr73lx51k1/gU8w673WT/oBtxPtAn1eFjUyIKyA+XD7kYph82I+ahvm0pSgDPagu917SlqUjeaQaNnlZzO03Iy1RZ5XpgbNeDLCqSLuZFVID80EohC2CQ1cL5svjslrlCNstd2JCLmhjL7xV3NYXerLim4bqUQGRgDwNJRnqobpS6C1NBns/Q==:`)
err = v.Verify(req)
if err != nil {
t.Error("verification failed:", err)
Expand Down Expand Up @@ -186,8 +188,8 @@ func TestVerify_B_2_4(t *testing.T) {
}
req := testReq()
req.Header.Set("Signature-Input", `sig1=("date" "content-type" "digest" "content-length");created=1618884475;keyid="test-key-ecc-p256"`)
req.Header.Set("Signature", `sig1=:3zmRDW6r50/RETqqhtx/N5sdd5eTh8xmHdsrYRK9wK4rCNEwLjCOBlcQxTL2oJTCWGRkuqE2r9KyqZFY9jd+NQ==:`)
req.Header.Set("Signature-Input", `sig1=("content-type" "digest" "content-length");created=1618884475;keyid="test-key-ecc-p256"`)
req.Header.Set("Signature", `sig1=:n8RKXkj0iseWDmC6PNSQ1GX2R9650v+lhbb6rTGoSrSSx18zmn6fPOtBx48/WffYLO0n1RHHf9scvNGAgGq52Q==:`)
err = v.Verify(req)
if err != nil {
t.Error("verification failed:", err)
Expand All @@ -210,8 +212,8 @@ func TestVerify_B_2_5(t *testing.T) {
}

req := testReq()
req.Header.Set("Signature-Input", `sig1=("host" "date" "content-type");created=1618884475;keyid="test-shared-secret"`)
req.Header.Set("Signature", `sig1=:x54VEvVOb0TMw8fUbsWdUHqqqOre+K7sB/LqHQvnfaQ=:`)
req.Header.Set("Signature-Input", `sig1=("@authority" "date" "content-type");created=1618884475;keyid="test-shared-secret"`)
req.Header.Set("Signature", `sig1=:fN3AMNGbx0V/cIEKkZOvLOoC3InI+lM2+gTv22x3ia8=:`)

err = v.Verify(req)
if err != nil {
Expand Down
23 changes: 15 additions & 8 deletions verify.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -119,16 +119,23 @@ func (v *verifier) Verify(msg *message) error {
// canonicalize headers
// TODO: wrap the errors within
for _, h := range params.items {
// optionally canonicalize request path via magic string
if h == "@request-target" {
err := canonicalizeRequestTarget(&b, msg.Method, msg.URL)
if err != nil {
return err
}
continue

// handle specialty components, section 2.3
var err error
switch h {
case "@method":
err = canonicalizeMethod(&b, msg.Method)
case "@path":
err = canonicalizePath(&b, msg.URL.Path)
case "@query":
err = canonicalizeQuery(&b, msg.URL.RawQuery)
case "@authority":
err = canonicalizeAuthority(&b, msg.Authority)
default:
// handle default (header) components
err = canonicalizeHeader(&b, h, msg.Header)
}

err := canonicalizeHeader(&b, h, msg.Header)
if err != nil {
return err
}
Expand Down

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