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socket.go
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socket.go
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// Copyright 2017-2018 Authors of Cilium
//
// 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 api
import (
"bufio"
"fmt"
"io"
"os"
"strconv"
"strings"
"github.com/cilium/cilium/pkg/logging"
"github.com/cilium/cilium/pkg/logging/logfields"
"github.com/sirupsen/logrus"
)
var log = logging.DefaultLogger.WithField(logfields.LogSubsys, "api")
// GetGroupIDByName returns the group ID for the given grpName.
func GetGroupIDByName(grpName string) (int, error) {
f, err := os.Open(GroupFilePath)
if err != nil {
return -1, err
}
defer f.Close()
br := bufio.NewReader(f)
for {
s, err := br.ReadString('\n')
if err == io.EOF {
break
}
if err != nil {
return -1, err
}
p := strings.Split(s, ":")
if len(p) >= 3 && p[0] == grpName {
return strconv.Atoi(p[2])
}
}
return -1, fmt.Errorf("group %q not found", grpName)
}
// SetDefaultPermissions sets the given socket to with cilium's default
// group and mode permissions. Group `CiliumGroupName` and mode `0660`
func SetDefaultPermissions(socketPath string) error {
gid, err := GetGroupIDByName(CiliumGroupName)
if err != nil {
log.WithError(err).WithFields(logrus.Fields{
logfields.Path: socketPath,
"group": CiliumGroupName,
}).Info("Group not found")
} else {
if err := os.Chown(socketPath, 0, gid); err != nil {
return fmt.Errorf("failed while setting up %s's group ID"+
" in %q: %s", CiliumGroupName, socketPath, err)
}
}
if err := os.Chmod(socketPath, SocketFileMode); err != nil {
return fmt.Errorf("failed while setting up %s's file"+
" permissions in %q: %s", CiliumGroupName, socketPath, err)
}
return nil
}