Initial Commit

This commit is contained in:
Markus Pesch 2020-09-02 11:07:10 +02:00
commit c0161e363c
Signed by: volker.raschek
GPG Key ID: 852BCC170D81A982
8 changed files with 515 additions and 0 deletions

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kind: pipeline
type: docker
name: amd64
steps:
- name: build-linux-amd64
image: docker.io/volkerraschek/build-image:latest
commands:
- make --jobs=$(nproc) bin/linux/amd64/set-sshkeys
when:
event:
- push
- pull_request
- tag
# steps:
# - name: test-unit
# image: docker.io/volkerraschek/build-image:latest
# commands:
# - make test/unit
# when:
# event:
# - push
# - pull_request
# - tag

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root = true
[*]
indent_style = space
indent_size = 2
end_of_line = lf
charset = utf-8
trim_trailing_whitespace = true
insert_final_newline = false
[Makefile]
indent_style = tab

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Makefile eol=lf

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bin

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# VERSION
# If no version is specified as a parameter of make, the last git hash
# value is taken.
VERSION?=$(shell git describe --abbrev=0)+$(shell date +'%Y%m%d%H%I%S')
# GOPROXY settings
# If no GOPROXY environment variable available, the pre-defined GOPROXY from go
# env to download and validate go modules is used. Exclude downloading and
# validation of all private modules which are pre-defined in GOPRIVATE. If no
# GOPRIVATE variable defined, the variable of go env is used.
GOPROXY?=$(shell go env GOPROXY)
GOPRIVATE?=$(shell go env GOPRIVATE)
# CONTAINER_RUNTIME
# The CONTAINER_RUNTIME variable will be used to specified the path to a
# container runtime. This is needed to start and run a container images.
CONTAINER_RUNTIME?=$(shell which docker)
CONTAINER_IMAGE_VERSION?=latest
# EXECUTABLE
EXECUTABLE=set-sshkeys
# BINARIES
# ==============================================================================
EXECUTABLE_TARGETS:= \
bin/linux/amd64/${EXECUTABLE} \
bin/linux/arm/5/${EXECUTABLE} \
bin/linux/arm/7/${EXECUTABLE} \
bin/tmp/${EXECUTABLE}
${EXECUTABLE}: bin/tmp/${EXECUTABLE}
bin/linux/amd64/${EXECUTABLE}:
GOOS=linux \
GOARCH=amd64 \
GOPROXY=${GOPROXY} \
GOPRIVATE=${GOPRIVATE} \
go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
bin/linux/arm/5/${EXECUTABLE}:
GOOS=linux \
GOARCH=arm \
GOARM=5 \
GOPROXY=${GOPROXY} \
GOPRIVATE=${GOPRIVATE} \
go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
bin/linux/arm/7/${EXECUTABLE}:
GOOS=linux \
GOARCH=arm \
GOARM=7 \
GOPROXY=${GOPROXY} \
GOPRIVATE=${GOPRIVATE} \
go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
bin/tmp/${EXECUTABLE}:
GOPROXY=${GOPROXY} \
GOPRIVATE=${GOPRIVATE} \
go build -ldflags "-X main.version=${VERSION:v%=%}" -o ${@}
# CLEAN
# ==============================================================================
PHONY+=clean
clean:
-rm --force --recursive bin/
# PHONY
# ==============================================================================
# Declare the contents of the PHONY variable as phony. We keep that information
# in a variable so we can use it in if_changed.
.PHONY: ${PHONY}

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module git.cryptic.systems/volker.raschek/set-sshkeys
go 1.15
require (
git.cryptic.systems/volker.raschek/go-logger v0.1.0
github.com/spf13/cobra v1.0.0
)

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golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20180905080454-ebe1bf3edb33/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181107165924-66b7b1311ac8/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20181116152217-5ac8a444bdc5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
golang.org/x/tools v0.0.0-20180221164845-07fd8470d635/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=

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package main
import (
"bufio"
"errors"
"fmt"
"log"
"os"
"os/user"
"path/filepath"
"strings"
"git.cryptic.systems/volker.raschek/go-logger"
"github.com/spf13/cobra"
)
var (
flogger logger.Logger
version string
)
func main() {
flogger = logger.NewLogger(logger.LogLevelDebug)
rootCmd := cobra.Command{
Use: "set-sshkeys",
RunE: rootCmd,
Version: version,
}
rootCmd.Flags().String("authorized_keys", "/etc/set-sshkeys/authorized_keys", "Public ssh keys which should be merged with users existing ssh keys")
rootCmd.Flags().Bool("remove", false, "Remove public ssh keys")
rootCmd.Flags().String("user", "root", "For which user the public SSH keys should be defined")
rootCmd.Execute()
}
func addSSHKeys(sshKeys []*sshKey, newSSHKeys []*sshKey) []*sshKey {
Label:
for i := range newSSHKeys {
for j := range sshKeys {
if sshKeys[j].Compare(newSSHKeys[i]) {
continue Label
}
}
sshKeys = append(sshKeys, newSSHKeys[i])
}
return sshKeys
}
func createAutorizationFile(authorizedKeyFile string) error {
err := os.MkdirAll(filepath.Dir(authorizedKeyFile), 700)
if err != nil {
return err
}
f, err := os.Create(authorizedKeyFile)
if err != nil {
return err
}
return f.Close()
}
func readSSHKeys(authorizedKeyFile string) ([]*sshKey, error) {
f, err := os.Open(authorizedKeyFile)
if err != nil {
return nil, err
}
sshKeys := make([]*sshKey, 0)
s := bufio.NewScanner(f)
Loop:
for s.Scan() {
line := s.Text()
parts := strings.Split(line, " ")
switch len(parts) {
case 2:
algorithm := parts[0]
pubKey := parts[1]
sshKey, err := newSSHKey(algorithm, pubKey)
if err != nil {
return nil, err
}
for i := range sshKeys {
if sshKeys[i].Compare(sshKey) {
continue Loop
}
}
sshKeys = append(sshKeys, sshKey)
case 3:
algorithm := parts[0]
pubKey := parts[1]
alias := parts[2]
sshKey, err := newSSHKey(algorithm, pubKey)
if err != nil {
return nil, err
}
sshKey.SetAlias(alias)
for i := range sshKeys {
if sshKeys[i].Compare(sshKey) {
continue Loop
}
}
sshKeys = append(sshKeys, sshKey)
default:
log.Printf("Require two and optional three parts for each line. Get %v parts", len(parts))
}
}
return sshKeys, nil
}
func removeSSHKeys(sshKeys []*sshKey, removeSSHKeys []*sshKey) []*sshKey {
for i := range removeSSHKeys {
for j := range sshKeys {
if sshKeys[j].Compare(removeSSHKeys[i]) {
sshKeys = append(sshKeys[:j], sshKeys[j+1:]...)
}
}
}
return sshKeys
}
func rootCmd(cmd *cobra.Command, args []string) error {
remove, err := cmd.Flags().GetBool("remove")
if err != nil {
return err
}
etcAuthorizedKeyFile, err := cmd.Flags().GetString("authorized_keys")
if err != nil {
return err
}
_, err = os.Stat(etcAuthorizedKeyFile)
if err != nil {
return err
}
username, err := cmd.Flags().GetString("user")
if err != nil {
return err
}
user, err := user.Lookup(username)
if err != nil {
return err
}
userAuthorizedKeyFile := filepath.Join(user.HomeDir, ".ssh", "authorized_keys")
_, err = os.Stat(userAuthorizedKeyFile)
switch {
case err == nil:
break
case errors.Is(err, os.ErrNotExist):
flogger.Debug("Create authorization file %v", userAuthorizedKeyFile)
if err := createAutorizationFile(userAuthorizedKeyFile); err != nil {
return err
}
default:
return err
}
etcAuthorizedKeys, err := readSSHKeys(etcAuthorizedKeyFile)
if err != nil {
return err
}
userAuthorizedKeys, err := readSSHKeys(userAuthorizedKeyFile)
if err != nil {
return err
}
if remove {
userAuthorizedKeys = removeSSHKeys(userAuthorizedKeys, etcAuthorizedKeys)
} else {
userAuthorizedKeys = addSSHKeys(userAuthorizedKeys, etcAuthorizedKeys)
}
return writeSSHKeys(userAuthorizedKeyFile, userAuthorizedKeys)
}
func writeSSHKeys(authorizedKeyFile string, sshKeys []*sshKey) error {
if err := createAutorizationFile(authorizedKeyFile); err != nil {
return err
}
f, err := os.Create(authorizedKeyFile)
if err != nil {
return err
}
for i := range sshKeys {
if len(sshKeys[i].alias) > 0 {
fmt.Fprintf(f, "%v %v %v\n", sshKeys[i].algorithm, sshKeys[i].pubKey, sshKeys[i].alias)
} else {
fmt.Fprintf(f, "%v %v\n", sshKeys[i].algorithm, sshKeys[i].pubKey)
}
}
return nil
}
type sshKey struct {
algorithm string
pubKey string
alias string
}
func (s *sshKey) Compare(k *sshKey) bool {
if s.algorithm == k.algorithm &&
s.pubKey == k.pubKey {
return true
}
return false
}
func (s *sshKey) SetAlias(alias string) {
if len(s.alias) <= 0 {
s.alias = alias
}
}
func (s *sshKey) Validate() error {
entries := map[string]string{
"algorithm": s.algorithm,
"pubKey": s.pubKey,
}
for key, value := range entries {
if len(value) <= 0 {
return fmt.Errorf("Missing attribute %v", key)
}
}
return nil
}
func newSSHKey(algorithm string, pubKey string) (*sshKey, error) {
return &sshKey{
algorithm: algorithm,
pubKey: pubKey,
}, nil
}