51 lines
1.6 KiB
Go
51 lines
1.6 KiB
Go
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// Copyright (C) 2025 klefki contributors
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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
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// published by the Free Software Foundation, either version 3 of the
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// License, or (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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//
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// SPDX-License-Identifier: AGPL-3.0
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package server
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import (
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"context"
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"crypto/ed25519"
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pbgrpcv1 "git.rgst.io/homelab/klefki/internal/server/grpc/generated/go/rgst/klefki/v1"
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)
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// AuthChallenge is an authentication challenge.
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type AuthChallenge struct {
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// MachineID is the ID of the machine that sent this request
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// (fingerprint).
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MachineID string `json:"machine_id"`
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// Signature is an ED25519 signature of the provided message.
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Signature []byte `json:"signature"`
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// Nonce is a randomly generated string that corresponds to the
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// provided signature.
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Nonce string `json:"nonce"`
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}
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// ValidateAuth determines if the auth presented is valid or not.
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func (s *Server) ValidateAuth(ctx context.Context, req *pbgrpcv1.GetKeyRequest) bool {
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// Get the public key for this node.
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m, err := s.db.Machine.Get(ctx, req.GetMachineId())
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if err != nil {
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return false
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}
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return ed25519.Verify(m.PublicKey, []byte(req.GetNonce()), req.GetSignature())
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}
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