/
server.go
117 lines (95 loc) · 3.15 KB
/
server.go
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/*
Copyright 2015 All rights reserved.
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 (
"fmt"
"net/http"
"time"
"github.com/gin-gonic/gin"
"github.com/golang/glog"
)
type openvpnAuthd struct {
config *AuthConfig
// the gin service
router *gin.Engine
// the vault api client
vault VaultService
}
// NewOpenVPNAuthd creates a new service for shipping out the openvpn config
func NewOpenVPNAuthd(cfg *AuthConfig) (OpenVPNAuthd, error) {
//var err error
glog.Infof("creating a new openvpn authd service, config: %s", cfg)
service := new(openvpnAuthd)
service.config = cfg
// step: create the vault client
glog.V(3).Infof("creating the vault client, address: %s, username: %s", cfg.VaultURL, cfg.VaultUsername)
client, err := NewVaultClient(cfg.VaultURL, cfg.VaultCaFile, cfg.VaultTLSVerify)
if err != nil {
return nil, fmt.Errorf("failed to create a vault client, error: %s", err)
}
service.vault = client
// step: attempt to authenticate to vault
err = client.Authenticate(cfg.VaultUsername, cfg.VaultPassword)
if err != nil {
return nil, fmt.Errorf("failed to authenticate to vault, error: %s", err)
}
// step: create the gin router
router := gin.New()
router.LoadHTMLGlob("templates/*")
router.Use(gin.Logger())
router.Use(gin.Recovery())
router.GET("/health", service.healthHandler)
router.GET("/", service.openVPNHandler)
service.router = router
return service, nil
}
// Run start the service
func (r *openvpnAuthd) Run() error {
go func() {
listener := fmt.Sprintf("%s:%d", r.config.ServiceBind, r.config.ServicePort)
err := r.router.Run(listener)
if err != nil {
glog.Fatalf("failed to start the service, error: %s", err)
}
}()
return nil
}
// openVPNHandler generate the openvpn config
func (r *openvpnAuthd) openVPNHandler(cx *gin.Context) {
// step: grab the authentication headers
emailAddress := cx.Request.Header.Get(r.config.AuthHeader)
if emailAddress == "" {
cx.AbortWithStatus(http.StatusForbidden)
return
}
// step: generate a certificate for them
cert, err := r.vault.GetCertificate(emailAddress, r.config.VaultPath, r.config.SessionDuration)
if err != nil {
glog.Errorf("failed to generate the certificate for openvpn account, reason: %s", err)
cx.AbortWithStatus(http.StatusInternalServerError)
return
}
// step: template out the config
cx.HTML(http.StatusOK, "openvpn.html", gin.H{
"openvpn_servers": r.config.servers,
"ttl": cert.TTL,
"expires_in": time.Now().Add(cert.TTL),
"certificate": cert.Certificate,
"private_key": cert.PrivateKey,
"issuing_ca": cert.IssuingCA,
"email": emailAddress,
})
}
func (r *openvpnAuthd) healthHandler(cx *gin.Context) {
cx.String(http.StatusOK, "OK")
}