forked from Silverfish/proton-bridge
70 lines
1.9 KiB
Go
70 lines
1.9 KiB
Go
// Copyright (c) 2022 Proton AG
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//
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// This file is part of Proton Mail Bridge.
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//
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// Proton Mail Bridge is free software: you can redistribute it and/or modify
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// it under the terms of the GNU 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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// Proton Mail Bridge 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 General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Proton Mail Bridge. If not, see <https://www.gnu.org/licenses/>.
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package pmapi
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import (
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"io"
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"github.com/ProtonMail/gopenpgp/v2/crypto"
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"golang.org/x/net/context"
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)
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// DownloadAndVerify downloads a file and its signature from the given locations `file` and `sig`.
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// The file and its signature are verified using the given keyring `kr`.
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// If the file is verified successfully, it can be read from the returned reader.
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// TLS fingerprinting is used to verify that connections are only made to known servers.
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func (m *manager) DownloadAndVerify(kr *crypto.KeyRing, url, sig string) ([]byte, error) {
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fb, err := m.fetchFile(url)
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if err != nil {
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return nil, err
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}
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sb, err := m.fetchFile(sig)
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if err != nil {
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return nil, err
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}
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if err := kr.VerifyDetached(
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crypto.NewPlainMessage(fb),
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crypto.NewPGPSignature(sb),
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crypto.GetUnixTime(),
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); err != nil {
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return nil, err
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}
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return fb, nil
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}
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func (m *manager) fetchFile(url string) ([]byte, error) {
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res, err := m.r(ContextWithoutRetry(context.Background())).SetDoNotParseResponse(true).Get(url)
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if err != nil {
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return nil, err
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}
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b, err := io.ReadAll(res.RawBody())
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if err != nil {
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return nil, err
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}
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if err := res.RawBody().Close(); err != nil {
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return nil, err
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}
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return b, nil
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}
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