github.com/datadog/cilium@v1.6.12/pkg/api/socket.go (about)

     1  // Copyright 2017-2018 Authors of Cilium
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package api
    16  
    17  import (
    18  	"bufio"
    19  	"fmt"
    20  	"io"
    21  	"os"
    22  	"strconv"
    23  	"strings"
    24  
    25  	"github.com/cilium/cilium/pkg/logging"
    26  	"github.com/cilium/cilium/pkg/logging/logfields"
    27  
    28  	"github.com/sirupsen/logrus"
    29  )
    30  
    31  var log = logging.DefaultLogger.WithField(logfields.LogSubsys, "api")
    32  
    33  // GetGroupIDByName returns the group ID for the given grpName.
    34  func GetGroupIDByName(grpName string) (int, error) {
    35  	f, err := os.Open(GroupFilePath)
    36  	if err != nil {
    37  		return -1, err
    38  	}
    39  	defer f.Close()
    40  	br := bufio.NewReader(f)
    41  	for {
    42  		s, err := br.ReadString('\n')
    43  		if err == io.EOF {
    44  			break
    45  		}
    46  		if err != nil {
    47  			return -1, err
    48  		}
    49  		p := strings.Split(s, ":")
    50  		if len(p) >= 3 && p[0] == grpName {
    51  			return strconv.Atoi(p[2])
    52  		}
    53  	}
    54  	return -1, fmt.Errorf("group %q not found", grpName)
    55  }
    56  
    57  // SetDefaultPermissions sets the given socket to with cilium's default
    58  // group and mode permissions. Group `CiliumGroupName` and mode `0660`
    59  func SetDefaultPermissions(socketPath string) error {
    60  	gid, err := GetGroupIDByName(CiliumGroupName)
    61  	if err != nil {
    62  		log.WithError(err).WithFields(logrus.Fields{
    63  			logfields.Path: socketPath,
    64  			"group":        CiliumGroupName,
    65  		}).Info("Group not found")
    66  	} else {
    67  		if err := os.Chown(socketPath, 0, gid); err != nil {
    68  			return fmt.Errorf("failed while setting up %s's group ID"+
    69  				" in %q: %s", CiliumGroupName, socketPath, err)
    70  		}
    71  	}
    72  	if err := os.Chmod(socketPath, SocketFileMode); err != nil {
    73  		return fmt.Errorf("failed while setting up %s's file"+
    74  			" permissions in %q: %s", CiliumGroupName, socketPath, err)
    75  	}
    76  	return nil
    77  }