cacert-boardvoting/cmd/boardvoting/config.go

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/*
Copyright 2017-2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package main
import (
"context"
"encoding/base64"
"errors"
"fmt"
"io/ioutil"
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"time"
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"github.com/gorilla/sessions"
"gopkg.in/yaml.v2"
)
const (
cookieSecretMinLen = 32
csrfKeyLength = 32
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httpIdleTimeout = 5 * time.Second
httpReadHeaderTimeout = 10 * time.Second
httpReadTimeout = 10 * time.Second
httpWriteTimeout = 60 * time.Second
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sessionCookieName = "votesession"
)
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type mailConfig struct {
SMTPHost string `yaml:"host"`
SMTPPort int `yaml:"port"`
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NotificationSenderAddress string `yaml:"notification_sender_address"`
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NoticeMailAddress string `yaml:"notice_mail_address"`
VoteNoticeMailAddress string `yaml:"vote_notice_mail_address"`
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}
type httpTimeoutConfig struct {
Idle time.Duration `yaml:"idle,omitempty"`
Read time.Duration `yaml:"read,omitempty"`
ReadHeader time.Duration `yaml:"read_header,omitempty"`
Write time.Duration `yaml:"write,omitempty"`
}
type Config struct {
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DatabaseFile string `yaml:"database_file"`
ClientCACertificates string `yaml:"client_ca_certificates"`
ServerCert string `yaml:"server_certificate"`
ServerKey string `yaml:"server_key"`
CookieSecret string `yaml:"cookie_secret"`
CsrfKey string `yaml:"csrf_key"`
BaseURL string `yaml:"base_url"`
HTTPAddress string `yaml:"http_address,omitempty"`
HTTPSAddress string `yaml:"https_address,omitempty"`
MailConfig *mailConfig `yaml:"mail_server"`
Timeouts *httpTimeoutConfig `yaml:"timeouts,omitempty"`
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}
type configKey int
const (
ctxConfig configKey = iota
ctxCookieStore
)
func parseConfig(ctx context.Context, configFile string) (context.Context, error) {
source, err := ioutil.ReadFile(configFile)
if err != nil {
return nil, fmt.Errorf("could not read configuration file %s: %w", configFile, err)
}
config := &Config{
HTTPAddress: "127.0.0.1:8000",
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HTTPSAddress: "127.0.0.1:8443",
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Timeouts: &httpTimeoutConfig{
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Idle: httpIdleTimeout,
ReadHeader: httpReadHeaderTimeout,
Read: httpReadTimeout,
Write: httpWriteTimeout,
},
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}
if err := yaml.Unmarshal(source, config); err != nil {
return nil, fmt.Errorf("could not parse configuration: %w", err)
}
cookieSecret, err := base64.StdEncoding.DecodeString(config.CookieSecret)
if err != nil {
return nil, fmt.Errorf("could not decode cookie secret: %w", err)
}
if len(cookieSecret) < cookieSecretMinLen {
return nil, fmt.Errorf("cookie secret is less than the minimum require %d bytes long", cookieSecretMinLen)
}
csrfKey, err := base64.StdEncoding.DecodeString(config.CsrfKey)
if err != nil {
return nil, fmt.Errorf("could not decode CSRF key: %w", err)
}
if len(csrfKey) != csrfKeyLength {
return nil, fmt.Errorf("CSRF key must be exactly %d bytes long but is %d bytes long", csrfKeyLength, len(csrfKey))
}
cookieStore := sessions.NewCookieStore(cookieSecret)
cookieStore.Options.Secure = true
ctx = context.WithValue(ctx, ctxConfig, config)
ctx = context.WithValue(ctx, ctxCookieStore, cookieStore)
return ctx, nil
}
func GetConfig(ctx context.Context) (*Config, error) {
config, ok := ctx.Value(ctxConfig).(*Config)
if !ok {
return nil, errors.New("invalid value type for config in context")
}
return config, nil
}
func GetCookieStore(ctx context.Context) (*sessions.CookieStore, error) {
cookieStore, ok := ctx.Value(ctxConfig).(*sessions.CookieStore)
if !ok {
return nil, errors.New("invalid value type for cookie store in context")
}
return cookieStore, nil
}