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package main
import (
"encoding/json"
"fmt"
"log"
"os"
"regexp"
"strings"
"riedstra.dev/go/dpw-ssm/store"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/ssm"
)
const SSM_MAX_SIZE = 4096
// ((16^4)*4096)/1024/1024
// If we ever need more than 256 MB in parameter store, we've done something
// very wrong.
const SSM_KEY_FORMAT = "%s-%04X" //
var (
KMS_KEY_ID *string = nil
VersionString = "development"
svc *ssm.SSM
Logger = log.New(os.Stderr, "", 0)
trimRegex = regexp.MustCompile("-[0-9A-E][0-9A-E][0-9A-E][0-9A-E]$")
keyPrefix = os.Getenv("DPW_SSM_PREFIX")
)
func listParams(params []string) {
info, err := store.GetInfo(svc)
if err != nil {
Logger.Fatal(err)
}
for key, _ := range info.ByKey {
// Skip over things that aren't prefixed...
if keyPrefix != "" && !strings.HasPrefix(key, keyPrefix) {
continue
}
fmt.Println(strings.TrimPrefix(key, keyPrefix))
}
os.Exit(0)
}
func insertParam(params []string) {
if len(params) != 1 {
Logger.Printf("Params provided: '%s'", params)
Logger.Fatal("Expected exactly one parameter, the path")
}
path := keyPrefix + params[0]
err := store.InsertParam(svc, os.Stdin, path)
if err != nil {
Logger.Fatalf("While inserting: '%s': %s", path, err)
}
os.Exit(0)
}
func showParam(params []string) {
if len(params) != 1 {
Logger.Printf("Params provided: '%s'", params)
Logger.Fatal("Expected exactly one parameter, the path")
}
path := keyPrefix + params[0]
err := store.GetParam(svc, os.Stdout, path)
if err != nil {
Logger.Fatalf("Encountered: %s\n", err)
}
os.Exit(0)
}
func removeParam(params []string) {
if len(params) != 1 {
Logger.Printf("Params provided: '%s'", params)
Logger.Fatal("Expected exactly one parameter, the path")
}
path := keyPrefix + params[0]
err := store.RemoveParam(svc, path)
if err != nil {
Logger.Fatalf("Encountered: %s\n", err)
}
os.Exit(0)
}
func help() {
fmt.Printf(`
dpw-ssm: An AWS SSM backend for the dynamic password manager.
https://git.riedstra.dev/mitch/dpw/about/
This can be used directly, but for interactive use 'dpw' is encouraged.
Available commands:
list
insert <key-name>
show <key-name>
rm <key-name>
Debugging environment variables:
DPW_SSM_DEBUG=YES # Enable extended logging
Environment variables:
DPW_SSM_PREFIX=<prefix for all keys>
DPW_SSM_KMS_KEY_ID=<KMS KEY ID> # Optional
DPW_SSM_TAGS='{"json":"encoded","set":"of","key":"value","pairs":"..."}'
version: %s
`, VersionString)
os.Exit(0)
}
func setRegion() {
if os.Getenv("AWS_REGION") == "" {
// Default to us-east-2
os.Setenv("AWS_REGION", "us-east-2")
// But if a default is set, respect that, since the AWS SDK for Go
// doesn't, normally.
if os.Getenv("AWS_DEFAULT_REGION") != "" {
os.Setenv("AWS_REGION", os.Getenv("AWS_DEFAULT_REGION"))
}
}
}
func main() {
if os.Getenv("DPW_SSM_DEBUG") != "" {
Logger = log.New(os.Stderr, "", log.LstdFlags|log.Lshortfile)
}
if os.Getenv("DPW_SSM_KMS_KEY_ID") != "" {
store.KMS_KEY_ID = aws.String(os.Getenv("DPW_SSM_KMS_KEY_ID"))
}
ssm_tags_json := os.Getenv("DPW_SSM_TAGS")
if ssm_tags_json != "" {
tags := map[string]string{}
err := json.Unmarshal([]byte(ssm_tags_json), &tags)
if err != nil {
Logger.Println("Warning, failed to decode DPW_SSM_TAGS: %s\n", err)
} else {
for k, v := range tags {
store.Tags = append(store.Tags, &ssm.Tag{
Key: aws.String(k),
Value: aws.String(v),
})
}
}
}
setRegion()
ses := session.Must(session.NewSession())
svc = ssm.New(ses)
for n, arg := range os.Args[1:] {
switch arg {
case "list":
listParams(os.Args[n+2:])
break
case "insert":
insertParam(os.Args[n+2:])
break
case "show":
showParam(os.Args[n+2:])
break
case "rm":
removeParam(os.Args[n+2:])
break
case "init":
fmt.Fprintln(os.Stderr, "No init process is necessary")
break
default:
fmt.Fprintf(os.Stderr, "Unknown argument: '%s'\n", arg)
help()
}
}
}
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