100 lines
2.5 KiB
Go
100 lines
2.5 KiB
Go
/*
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Copyright 2022 CAcert Inc.
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SPDX-License-Identifier: Apache-2.0
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package hsm
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import (
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"context"
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"errors"
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"fmt"
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"log"
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"os"
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"strings"
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"syscall"
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"github.com/ThalesIgnite/crypto11"
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"golang.org/x/term"
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)
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func prepareCrypto11Context(ctx context.Context, label string) (*crypto11.Context, error) {
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storage, ok := GetSignerConfig(ctx).KeyStorage[label]
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if !ok {
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return nil, fmt.Errorf("could not find storage definition with label %s", label)
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}
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var (
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err error
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p11Context *crypto11.Context
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)
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p11Config := &crypto11.Config{
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Path: storage.Module,
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TokenLabel: storage.Label,
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}
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log.Printf("using PKCS#11 module %s", p11Config.Path)
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log.Printf("looking for token with label %s", p11Config.TokenLabel)
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p11Config.Pin, err = getPin(p11Config)
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if err != nil {
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return nil, err
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}
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p11Context, err = crypto11.Configure(p11Config)
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if err != nil {
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return nil, fmt.Errorf("could not configure PKCS#11 library: %w", err)
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}
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return p11Context, nil
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}
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func getPin(p11Config *crypto11.Config) (string, error) {
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var err error
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tokenPinEnv := strings.ReplaceAll(p11Config.TokenLabel, "-", "_")
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tokenPinEnv = strings.ReplaceAll(tokenPinEnv, " ", "_")
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tokenPinEnv = strings.ToUpper(tokenPinEnv)
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tokenPinEnv = fmt.Sprintf("TOKEN_PIN_%s", tokenPinEnv)
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pin, found := os.LookupEnv(tokenPinEnv)
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if !found {
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log.Printf("environment variable %s has not been set", tokenPinEnv)
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if !term.IsTerminal(syscall.Stdin) {
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return "", errors.New("stdin is not a terminal")
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}
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_, err = fmt.Fprintf(os.Stdout, "Enter PIN for token %s: ", p11Config.TokenLabel)
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if err != nil {
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return "", fmt.Errorf("could not write PIN prompt: %w", err)
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}
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bytePin, err := term.ReadPassword(syscall.Stdin)
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if err != nil {
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return "", fmt.Errorf("could not read PIN: %w", err)
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}
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_, err = fmt.Fprintln(os.Stdout)
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if err != nil {
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return "", fmt.Errorf("could not write to stdout: %w", err)
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}
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pin = string(bytePin)
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}
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return strings.TrimSpace(pin), nil
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}
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