/* 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 ( "encoding/base64" "fmt" "io/ioutil" "time" "gopkg.in/yaml.v2" ) const ( cookieSecretMinLen = 32 csrfKeyLength = 32 httpIdleTimeout = time.Minute httpReadHeaderTimeout = 5 * time.Second httpReadTimeout = 5 * time.Second httpWriteTimeout = 10 * time.Second ) type mailConfig struct { SMTPHost string `yaml:"smtp_host"` SMTPPort int `yaml:"smtp_port"` NotificationSenderAddress string `yaml:"notification_sender_address"` NoticeMailAddress string `yaml:"notice_mail_address"` VoteNoticeMailAddress string `yaml:"vote_notice_mail_address"` BaseURL string `yaml:"base_url"` } 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 { DatabaseFile string `yaml:"database_file"` ClientCACertificates string `yaml:"client_ca_certificates"` ServerCert string `yaml:"server_certificate"` ServerKey string `yaml:"server_key"` CookieSecretStr string `yaml:"cookie_secret"` CsrfKeyStr string `yaml:"csrf_key"` HTTPAddress string `yaml:"http_address,omitempty"` HTTPSAddress string `yaml:"https_address,omitempty"` MailConfig *mailConfig `yaml:"mail_config"` Timeouts *httpTimeoutConfig `yaml:"timeouts,omitempty"` CookieSecret []byte `yaml:"-"` CsrfKey []byte `yaml:"-"` } func parseConfig(configFile string) (*Config, 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", HTTPSAddress: "127.0.0.1:8443", Timeouts: &httpTimeoutConfig{ Idle: httpIdleTimeout, ReadHeader: httpReadHeaderTimeout, Read: httpReadTimeout, Write: httpWriteTimeout, }, } if err := yaml.Unmarshal(source, config); err != nil { return nil, fmt.Errorf("could not parse configuration: %w", err) } if config.CookieSecret, err = base64.StdEncoding.DecodeString(config.CookieSecretStr); err != nil { return nil, fmt.Errorf("could not decode cookie secret: %w", err) } if len(config.CookieSecret) < cookieSecretMinLen { return nil, fmt.Errorf("cookie secret is less than the minimum require %d bytes long", cookieSecretMinLen) } if config.CsrfKey, err = base64.StdEncoding.DecodeString(config.CsrfKeyStr); err != nil { return nil, fmt.Errorf("could not decode CSRF key: %w", err) } if len(config.CsrfKey) != csrfKeyLength { return nil, fmt.Errorf( "CSRF key must be exactly %d bytes long but is %d bytes long", csrfKeyLength, len(config.CsrfKey), ) } return config, nil }