102 lines
3.0 KiB
Go
102 lines
3.0 KiB
Go
/*
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© Copyright IBM Corporation 2018
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"os/user"
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"strings"
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"github.com/ibm-messaging/mq-container/internal/command"
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)
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const groupName string = "suplgroup"
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func verifyCurrentUser() error {
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log.Debug("Verifying current user information")
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curUser, err := user.Current()
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if err != nil {
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return err
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}
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log.Debugf("Detected current user as: %v+", curUser)
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if curUser.Username == "mqm" {
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// Not supported yet
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return fmt.Errorf("Container is running as mqm user which is not supported. Please run this container as root")
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} else if curUser.Username == "root" {
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// We're running as root so need to check for suplimentary groups.
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// We can't use the golang User.GroupIDs as it doesn't seem to detect container supplimentary groups..
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groups, err := getCurrentGroups()
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for _, e := range groups {
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_, _, testGroup := command.Run("getent", "group", e)
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if testGroup != nil {
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log.Printf("Group %s does not exist on the system... Adding to system and MQM user", e)
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_, _, err = command.Run("groupadd", "-g", e, groupName)
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if err != nil {
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log.Errorf("Failed to create group %s as %s", e, groupName)
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return err
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}
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_, _, err = command.Run("usermod", "-aG", groupName, "mqm")
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if err != nil {
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log.Errorf("Failed to add group %s(%s) to the mqm user.", groupName, e)
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return err
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}
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}
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}
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} else {
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// We're running as an unknown user...
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return fmt.Errorf("Container is running as %s user which is not supported. Please run this container as root", curUser.Username)
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}
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return nil
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}
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func logUser() {
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u, err := user.Current()
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if err == nil {
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g, err := getCurrentGroups()
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if err != nil && len(g) == 0 {
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log.Printf("Running as user ID %v (%v) with primary group %v", u.Uid, u.Name, u.Gid)
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} else {
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// Look for the primary group in the list of group IDs
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for i, v := range g {
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if v == u.Gid {
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// Remove the element from the slice
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g = append(g[:i], g[i+1:]...)
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}
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}
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log.Printf("Running as user ID %v (%v) with primary group %v, and supplemental groups %v", u.Uid, u.Name, u.Gid, strings.Join(g, ","))
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}
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}
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}
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func getCurrentGroups() ([]string, error) {
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var nilArray []string
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out, _, err := command.Run("id", "--groups")
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if err != nil {
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log.Debug("Unable to get current user groups")
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return nilArray, err
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}
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out = strings.TrimSpace(out)
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if out == "" {
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// we don't have any groups?
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return nilArray, fmt.Errorf("Unable to determine groups for current user")
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}
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groups := strings.Split(out, " ")
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return groups, nil
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}
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