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forked from cloudposse/github-authorized-keys
/
linux_groups.go
92 lines (73 loc) · 2.34 KB
/
linux_groups.go
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/*
* Github Authorized Keys - Use GitHub teams to manage system user accounts and authorized_keys
*
* Copyright 2016 Cloud Posse, LLC <hello@cloudposse.com>
*
* 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 (
"errors"
"os/user"
)
const (
// Group file contains one row per group
// Format of the row consists at least of 3 columns
// https://en.wikipedia.org/wiki/Group_identifier
countOfColumnsInGroup = 3
// Group name stored in 0 column
nameColumnNumberInGroup = 0
// Group password flag stored in 1 column
passwordFlagColumnNumberInGroup = 1
// Group GID stored in 2 column
gidColumnNumberInGroup = 2
// Group GID stored in 3 column
usersColumnNumberInGroup = 3
)
func (linux *Linux) groupLookup(groupName string) (*user.Group, error) {
groupInfo, err := linux.getEntity("group", groupName)
if err != nil {
return nil, user.UnknownGroupError(groupName)
}
if len(groupInfo) < countOfColumnsInGroup {
return nil, errors.New("Wrong format of /etc/group")
}
group := user.Group{
Gid: groupInfo[gidColumnNumberInGroup],
Name: groupInfo[nameColumnNumberInGroup],
}
return &group, err
}
func (linux *Linux) groupLookupByID(groupID string) (*user.Group, error) {
groupInfo, err := linux.getEntity("group", groupID)
if err != nil {
return nil, user.UnknownGroupIdError(groupID)
}
if len(groupInfo) < countOfColumnsInGroup {
return nil, errors.New("Wrong format of /etc/group")
}
group := user.Group{
Gid: groupInfo[gidColumnNumberInGroup],
Name: groupInfo[nameColumnNumberInGroup],
}
return &group, err
}
// GroupExists - check if group {groupName} exists
func (linux *Linux) GroupExists(groupName string) bool {
group, _ := linux.groupLookup(groupName)
return group != nil
}
func (linux *Linux) groupExistsByID(groupID string) bool {
group, _ := linux.groupLookupByID(groupID)
return group != nil
}