11770b4058
Implement a full OAuth2 2.0 and OpenID Connect 1.0 authorization server with support for authorization code flow (with PKCE), refresh token rotation, device authorization grant, dynamic client registration, token introspection, and token revocation. Includes database schema, coredata layer, service logic, HTTP handlers, OIDC discovery endpoint, and JWKS publishing. Signed-off-by: Bryan Frimin <bryan@getprobo.com>
99 lines
2.9 KiB
Go
99 lines
2.9 KiB
Go
// Copyright (c) 2026 Probo Inc <hello@getprobo.com>.
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice appear in all copies.
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//
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// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
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// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
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// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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// PERFORMANCE OF THIS SOFTWARE.
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package jose
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import (
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"crypto"
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"crypto/rand"
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"crypto/rsa"
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"crypto/sha256"
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"encoding/base64"
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"encoding/json"
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"fmt"
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"math/big"
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)
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type (
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// JWK represents a JSON Web Key (RFC 7517).
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JWK struct {
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KeyType string `json:"kty"`
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Use string `json:"use"`
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Algorithm string `json:"alg"`
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KeyID string `json:"kid"`
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N string `json:"n"`
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E string `json:"e"`
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}
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// JWKS represents a JSON Web Key Set (RFC 7517).
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JWKS struct {
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Keys []JWK `json:"keys"`
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}
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// JWTHeader represents a JWT header (RFC 7519).
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JWTHeader struct {
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Algorithm string `json:"alg"`
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Type string `json:"typ"`
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KeyID string `json:"kid"`
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}
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)
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// RSAPublicKeyToJWK converts an RSA public key to a JWK with the given
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// key ID, marked for RS256 signature use.
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func RSAPublicKeyToJWK(pub *rsa.PublicKey, kid string) JWK {
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return JWK{
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KeyType: "RSA",
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Use: "sig",
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Algorithm: "RS256",
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KeyID: kid,
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N: base64.RawURLEncoding.EncodeToString(pub.N.Bytes()),
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E: base64.RawURLEncoding.EncodeToString(big.NewInt(int64(pub.E)).Bytes()),
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}
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}
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// SignJWT signs arbitrary claims as a JWT using RS256 with the given RSA
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// private key and key ID. The claims value is JSON-marshaled as the payload.
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func SignJWT(privateKey *rsa.PrivateKey, kid string, claims any) (string, error) {
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header := JWTHeader{
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Algorithm: "RS256",
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Type: "JWT",
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KeyID: kid,
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}
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headerJSON, err := json.Marshal(header)
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if err != nil {
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return "", fmt.Errorf("cannot marshal jwt header: %w", err)
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}
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claimsJSON, err := json.Marshal(claims)
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if err != nil {
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return "", fmt.Errorf("cannot marshal jwt claims: %w", err)
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}
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headerB64 := base64.RawURLEncoding.EncodeToString(headerJSON)
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claimsB64 := base64.RawURLEncoding.EncodeToString(claimsJSON)
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signingInput := headerB64 + "." + claimsB64
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h := sha256.Sum256([]byte(signingInput))
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signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey, crypto.SHA256, h[:])
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if err != nil {
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return "", fmt.Errorf("cannot sign jwt: %w", err)
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}
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signatureB64 := base64.RawURLEncoding.EncodeToString(signature)
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return signingInput + "." + signatureB64, nil
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}
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