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https://github.com/go-vikunja/vikunja.git
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a6e7475153
Add redirect URI validation that allowlists vikunja-* custom protocol schemes, rejecting http/https and dangerous schemes like javascript:. Add PKCE S256 verification following RFC 7636.
35 lines
1.3 KiB
Go
35 lines
1.3 KiB
Go
// Vikunja is a to-do list application to facilitate your life.
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// Copyright 2018-present Vikunja and contributors. All rights reserved.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package oauth2server
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import (
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"crypto/sha256"
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"encoding/base64"
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)
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// VerifyPKCE verifies a PKCE code_verifier against a stored code_challenge using S256.
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// S256: BASE64URL(SHA256(code_verifier)) == code_challenge
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func VerifyPKCE(codeVerifier, codeChallenge, codeChallengeMethod string) bool {
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if codeChallengeMethod != "S256" {
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return false
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}
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h := sha256.Sum256([]byte(codeVerifier))
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computed := base64.RawURLEncoding.EncodeToString(h[:])
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return computed == codeChallenge
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}
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