142 lines
4.2 KiB
Go
142 lines
4.2 KiB
Go
/*
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Copyright 2017-2022 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 main
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import (
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"context"
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"encoding/base64"
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"errors"
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"fmt"
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"io/ioutil"
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"time"
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"github.com/gorilla/sessions"
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"gopkg.in/yaml.v2"
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)
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const (
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cookieSecretMinLen = 32
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csrfKeyLength = 32
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httpIdleTimeout = 5 * time.Second
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httpReadHeaderTimeout = 10 * time.Second
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httpReadTimeout = 10 * time.Second
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httpWriteTimeout = 60 * time.Second
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sessionCookieName = "votesession"
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)
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type mailConfig struct {
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SMTPHost string `yaml:"host"`
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SMTPPort int `yaml:"port"`
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NotificationSenderAddress string `yaml:"notification_sender_address"`
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NoticeMailAddress string `yaml:"notice_mail_address"`
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VoteNoticeMailAddress string `yaml:"vote_notice_mail_address"`
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}
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type httpTimeoutConfig struct {
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Idle time.Duration `yaml:"idle,omitempty"`
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Read time.Duration `yaml:"read,omitempty"`
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ReadHeader time.Duration `yaml:"read_header,omitempty"`
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Write time.Duration `yaml:"write,omitempty"`
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}
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type Config struct {
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DatabaseFile string `yaml:"database_file"`
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ClientCACertificates string `yaml:"client_ca_certificates"`
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ServerCert string `yaml:"server_certificate"`
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ServerKey string `yaml:"server_key"`
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CookieSecret string `yaml:"cookie_secret"`
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CsrfKey string `yaml:"csrf_key"`
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BaseURL string `yaml:"base_url"`
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HTTPAddress string `yaml:"http_address,omitempty"`
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HTTPSAddress string `yaml:"https_address,omitempty"`
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MailConfig *mailConfig `yaml:"mail_server"`
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Timeouts *httpTimeoutConfig `yaml:"timeouts,omitempty"`
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}
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type configKey int
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const (
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ctxConfig configKey = iota
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ctxCookieStore
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)
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func parseConfig(ctx context.Context, configFile string) (context.Context, error) {
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source, err := ioutil.ReadFile(configFile)
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if err != nil {
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return nil, fmt.Errorf("could not read configuration file %s: %w", configFile, err)
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}
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config := &Config{
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HTTPAddress: "127.0.0.1:8000",
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HTTPSAddress: "127.0.0.1:8433",
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Timeouts: &httpTimeoutConfig{
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Idle: httpIdleTimeout,
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ReadHeader: httpReadHeaderTimeout,
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Read: httpReadTimeout,
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Write: httpWriteTimeout,
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},
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}
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if err := yaml.Unmarshal(source, config); err != nil {
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return nil, fmt.Errorf("could not parse configuration: %w", err)
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}
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cookieSecret, err := base64.StdEncoding.DecodeString(config.CookieSecret)
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if err != nil {
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return nil, fmt.Errorf("could not decode cookie secret: %w", err)
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}
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if len(cookieSecret) < cookieSecretMinLen {
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return nil, fmt.Errorf("cookie secret is less than the minimum require %d bytes long", cookieSecretMinLen)
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}
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csrfKey, err := base64.StdEncoding.DecodeString(config.CsrfKey)
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if err != nil {
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return nil, fmt.Errorf("could not decode CSRF key: %w", err)
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}
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if len(csrfKey) != csrfKeyLength {
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return nil, fmt.Errorf("CSRF key must be exactly %d bytes long but is %d bytes long", csrfKeyLength, len(csrfKey))
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}
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cookieStore := sessions.NewCookieStore(cookieSecret)
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cookieStore.Options.Secure = true
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ctx = context.WithValue(ctx, ctxConfig, config)
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ctx = context.WithValue(ctx, ctxCookieStore, cookieStore)
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return ctx, nil
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}
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func GetConfig(ctx context.Context) (*Config, error) {
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config, ok := ctx.Value(ctxConfig).(*Config)
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if !ok {
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return nil, errors.New("invalid value type for config in context")
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}
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return config, nil
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}
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func GetCookieStore(ctx context.Context) (*sessions.CookieStore, error) {
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cookieStore, ok := ctx.Value(ctxConfig).(*sessions.CookieStore)
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if !ok {
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return nil, errors.New("invalid value type for cookie store in context")
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}
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return cookieStore, nil
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}
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