[feat] add sip authentication

initial merge of the sip authentication mechanism

1 files changed, 88 insertions, 0 deletions

diff --git a/pkg/vpn/bonafide/auth_sip.go b/pkg/vpn/bonafide/auth_sip.go
new file mode 100644
index 0000000..d8ebedb
--- /dev/null
+++ b/pkg/vpn/bonafide/auth_sip.go
@@ -0,0 +1,88 @@
+// Copyright (C) 2018 LEAP
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package bonafide
+
+import (
+	"encoding/json"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"strings"
+)
+
+type SipAuthentication struct {
+	bonafide *Bonafide
+}
+
+func (a *SipAuthentication) GetPemCertificate() ([]byte, error) {
+	cred := a.bonafide.credentials
+	if cred == nil {
+		return nil, fmt.Errorf("Need bonafide credentials for sip auth")
+	}
+	credJson, err := formatCredentials(cred.User, cred.Password)
+	if err != nil {
+		return nil, fmt.Errorf("Cannot encode credentials: %s", err)
+	}
+	token, err := a.getToken(credJson)
+	if err != nil {
+		return nil, fmt.Errorf("Error while getting token: %s", err)
+	}
+	cert, err := a.getProtectedCert(string(token))
+	if err != nil {
+		return nil, fmt.Errorf("Error while getting cert: %s", err)
+	}
+	return cert, nil
+}
+
+func (a *SipAuthentication) getProtectedCert(token string) ([]byte, error) {
+	req, err := http.NewRequest("POST", certAPI, strings.NewReader(""))
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", token))
+	resp, err := a.bonafide.client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("Error while getting token: %s", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("Cannot get cert: Error %d", resp.StatusCode)
+	}
+	return ioutil.ReadAll(resp.Body)
+}
+
+func (a *SipAuthentication) getToken(credJson string) ([]byte, error) {
+	/* TODO
+	[ ] get token from disk?
+	[ ] check if expired? set a goroutine to refresh it periodically?
+	*/
+	resp, err := http.Post(authAPI, "text/json", strings.NewReader(credJson))
+	if err != nil {
+		log.Fatal("Error on auth request: ", err)
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		return nil, fmt.Errorf("Cannot get token: Error %d", resp.StatusCode)
+	}
+	return ioutil.ReadAll(resp.Body)
+}
+
+func formatCredentials(user, pass string) (string, error) {
+	c := Credentials{User: user, Password: pass}
+	credJson, err := json.Marshal(c)
+	if err != nil {
+		return "", err
+	}
+	return string(credJson), nil
+}