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activitypub: Sign the Host header too

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Mastodon with `AUTHORIZED_FETCH` enabled requires the `Host` header to
be signed too, add it to the default for `setting.Federation.GetHeaders`
and `setting.Federation.PostHeaders`.

For this to work, we need to sign the request later: not immediately
after `NewRequest`, but just before sending them out with `client.Do`.
Doing so also lets us use `setting.Federation.GetHeaders` (we were using
`.PostHeaders` even for GET requests before).

Signed-off-by: Gergely Nagy <forgejo@gergo.csillger.hu>
This commit is contained in:
Gergely Nagy 2024-08-04 15:34:31 +02:00
parent c031881a20
commit cd17eb0fa7
No known key found for this signature in database
2 changed files with 30 additions and 13 deletions
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39
modules/activitypub/client.go
View file

@ -36,16 +36,19 @@ func CurrentTime() string {
}
func containsRequiredHTTPHeaders(method string, headers []string) error {
var hasRequestTarget, hasDate, hasDigest bool
var hasRequestTarget, hasDate, hasDigest, hasHost bool
for _, header := range headers {
hasRequestTarget = hasRequestTarget || header == httpsig.RequestTarget
hasDate = hasDate || header == "Date"
hasDigest = hasDigest || header == "Digest"
hasHost = hasHost || header == "Host"
}
if !hasRequestTarget {
return fmt.Errorf("missing http header for %s: %s", method, httpsig.RequestTarget)
} else if !hasDate {
return fmt.Errorf("missing http header for %s: Date", method)
} else if !hasHost {
return fmt.Errorf("missing http header for %s: Host", method)
} else if !hasDigest && method != http.MethodGet {
return fmt.Errorf("missing http header for %s: Digest", method)
}
@ -99,29 +102,36 @@ func NewClient(ctx context.Context, user *user_model.User, pubID string) (c *Cli
}
// NewRequest function
func (c *Client) NewRequest(method string, b []byte, to string) (req *http.Request, err error) {
func (c *Client) newRequest(method string, b []byte, to string) (req *http.Request, err error) {
buf := bytes.NewBuffer(b)
req, err = http.NewRequest(method, to, buf)
if err != nil {
return nil, err
}
req.Header.Add("Content-Type", ActivityStreamsContentType)
req.Header.Add("Accept", "application/json, "+ActivityStreamsContentType)
req.Header.Add("Date", CurrentTime())
req.Header.Add("Host", req.URL.Host)
req.Header.Add("User-Agent", "Gitea/"+setting.AppVer)
signer, _, err := httpsig.NewSigner(c.algs, c.digestAlg, c.postHeaders, httpsig.Signature, httpsigExpirationTime)
if err != nil {
return nil, err
}
err = signer.SignRequest(c.priv, c.pubID, req, b)
req.Header.Add("Content-Type", ActivityStreamsContentType)
return req, err
}
// Post function
func (c *Client) Post(b []byte, to string) (resp *http.Response, err error) {
var req *http.Request
if req, err = c.NewRequest(http.MethodPost, b, to); err != nil {
if req, err = c.newRequest(http.MethodPost, b, to); err != nil {
return nil, err
}
signer, _, err := httpsig.NewSigner(c.algs, c.digestAlg, c.postHeaders, httpsig.Signature, httpsigExpirationTime)
if err != nil {
return nil, err
}
if err := signer.SignRequest(c.priv, c.pubID, req, b); err != nil {
return nil, err
}
resp, err = c.client.Do(req)
return resp, err
}
@ -129,10 +139,17 @@ func (c *Client) Post(b []byte, to string) (resp *http.Response, err error) {
// Create an http GET request with forgejo/gitea specific headers
func (c *Client) Get(to string) (resp *http.Response, err error) {
var req *http.Request
emptyBody := []byte{0}
if req, err = c.NewRequest(http.MethodGet, emptyBody, to); err != nil {
if req, err = c.newRequest(http.MethodGet, nil, to); err != nil {
return nil, err
}
signer, _, err := httpsig.NewSigner(c.algs, c.digestAlg, c.getHeaders, httpsig.Signature, httpsigExpirationTime)
if err != nil {
return nil, err
}
if err := signer.SignRequest(c.priv, c.pubID, req, nil); err != nil {
return nil, err
}
resp, err = c.client.Do(req)
return resp, err
}

4
modules/setting/federation.go
View file

@ -25,8 +25,8 @@ var (
MaxSize: 4,
Algorithms: []string{"rsa-sha256", "rsa-sha512", "ed25519"},
DigestAlgorithm: "SHA-256",
GetHeaders: []string{"(request-target)", "Date"},
PostHeaders: []string{"(request-target)", "Date", "Digest"},
GetHeaders: []string{"(request-target)", "Date", "Host"},
PostHeaders: []string{"(request-target)", "Date", "Host", "Digest"},
}
)