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Allow for PKCE flow without client secret + add docs (#25033)

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The PKCE flow according to [RFC
7636](https://datatracker.ietf.org/doc/html/rfc7636) allows for secure
authorization without the requirement to provide a client secret for the
OAuth app.

It is implemented in Gitea since #5378 (v1.8.0), however without being
able to omit client secret.
Since #21316 Gitea supports setting client type at OAuth app
registration.

As public clients are already forced to use PKCE since #21316, in this
PR the client secret check is being skipped if a public client is
detected. As Gitea seems to implement PKCE authorization correctly
according to the spec, this would allow for PKCE flow without providing
a client secret.

Also add some docs for it, please check language as I'm not a native
English speaker.

Closes #17107
Closes #25047
This commit is contained in:
Denys Konovalov 2023-06-03 05:59:28 +02:00 • committed by GitHub
parent 7fca4056c4
commit 7d855efb1f
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3 changed files with 96 additions and 9 deletions
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23
tests/integration/oauth_test.go
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@ -120,6 +120,29 @@ func TestAccessTokenExchange(t *testing.T) {
assert.True(t, len(parsed.RefreshToken) > 10)
}
func TestAccessTokenExchangeWithPublicClient(t *testing.T) {
defer tests.PrepareTestEnv(t)()
req := NewRequestWithValues(t, "POST", "/login/oauth/access_token", map[string]string{
"grant_type": "authorization_code",
"client_id": "ce5a1322-42a7-11ed-b878-0242ac120002",
"redirect_uri": "http://127.0.0.1",
"code": "authcodepublic",
"code_verifier": "N1Zo9-8Rfwhkt68r1r29ty8YwIraXR8eh_1Qwxg7yQXsonBt",
})
resp := MakeRequest(t, req, http.StatusOK)
type response struct {
AccessToken string `json:"access_token"`
TokenType string `json:"token_type"`
ExpiresIn int64 `json:"expires_in"`
RefreshToken string `json:"refresh_token"`
}
parsed := new(response)
assert.NoError(t, json.Unmarshal(resp.Body.Bytes(), parsed))
assert.True(t, len(parsed.AccessToken) > 10)
assert.True(t, len(parsed.RefreshToken) > 10)
}
func TestAccessTokenExchangeJSON(t *testing.T) {
defer tests.PrepareTestEnv(t)()
req := NewRequestWithJSON(t, "POST", "/login/oauth/access_token", map[string]string{