commit c0161e363c88ccc03d33cdc2c783ef8c59c0fb45 Author: Markus Pesch Date: Wed Sep 2 11:07:10 2020 +0200 Initial Commit diff --git a/.drone.yml b/.drone.yml new file mode 100644 index 0000000..b377ea8 --- /dev/null +++ b/.drone.yml @@ -0,0 +1,25 @@ +kind: pipeline +type: docker +name: amd64 + +steps: +- name: build-linux-amd64 + image: docker.io/volkerraschek/build-image:latest + commands: + - make --jobs=$(nproc) bin/linux/amd64/set-sshkeys + when: + event: + - push + - pull_request + - tag + +# steps: +# - name: test-unit +# image: docker.io/volkerraschek/build-image:latest +# commands: +# - make test/unit +# when: +# event: +# - push +# - pull_request +# - tag \ No newline at end of file diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 0000000..b53e68c --- /dev/null +++ b/.editorconfig @@ -0,0 +1,12 @@ +root = true + +[*] +indent_style = space +indent_size = 2 +end_of_line = lf +charset = utf-8 +trim_trailing_whitespace = true +insert_final_newline = false + +[Makefile] +indent_style = tab \ No newline at end of file diff --git a/.gitattributes b/.gitattributes new file mode 100644 index 0000000..dcd9d00 --- /dev/null +++ b/.gitattributes @@ -0,0 +1 @@ +Makefile eol=lf \ No newline at end of file diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..c5e82d7 --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +bin \ No newline at end of file diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..1ecaee0 --- /dev/null +++ b/Makefile @@ -0,0 +1,71 @@ +# VERSION +# If no version is specified as a parameter of make, the last git hash +# value is taken. +VERSION?=$(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} \ No newline at end of file diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..d5fda50 --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..a52fb95 --- /dev/null +++ b/go.sum @@ -0,0 +1,134 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +git.cryptic.systems/volker.raschek/go-logger v0.1.0 h1:JHBDesKBZaXjc2AlqYms1T3dGIX0oNIOBWl4cnVFWIo= +git.cryptic.systems/volker.raschek/go-logger v0.1.0/go.mod h1:GqeuxFj64SAolfj5kpbWup6E1vv37SaH5S+4wa40Tqs= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= 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h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/main.go b/main.go new file mode 100644 index 0000000..1f5e6ed --- /dev/null +++ b/main.go @@ -0,0 +1,263 @@ +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 +}