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exec.go
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exec.go
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package main
import (
"io"
"io/ioutil"
"log"
"net"
"net/http"
"net/http/httputil"
"os"
"os/exec"
"strings"
"syscall"
"time"
"github.com/99designs/aws-vault/keyring"
"github.com/aws/aws-sdk-go/aws/awserr"
)
type ExecCommandInput struct {
Profile string
Command string
Args []string
Keyring keyring.Keyring
Duration time.Duration
WriteEnv bool
Signals chan os.Signal
}
func ExecCommand(ui Ui, input ExecCommandInput) {
creds, err := NewVaultCredentials(input.Keyring, input.Profile, VaultOptions{
SessionDuration: input.Duration,
WriteEnv: input.WriteEnv,
})
if err != nil {
ui.Error.Fatal(err)
}
val, err := creds.Get()
if err != nil {
if awsErr, ok := err.(awserr.Error); ok && awsErr.Code() == "NoCredentialProviders" {
ui.Error.Fatalf("No credentials found for profile %q", input.Profile)
} else {
ui.Error.Fatal(err)
}
}
l, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
ui.Error.Fatal(err)
}
go func() {
log.Printf("Metadata server listening on %s", l.Addr().String())
ui.Error.Fatal(http.Serve(l, proxyHandler(NewMetadataHandler(creds))))
}()
cfg, err := profileConfig(input.Profile)
if err != nil {
ui.Error.Fatal(cfg)
}
env := os.Environ()
env = overwriteEnv(env, "http_proxy", "http://"+l.Addr().String())
env = overwriteEnv(env, "no_proxy", "amazonaws.com")
env = overwriteEnv(env, "AWS_CONFIG_FILE", cfg.Name())
env = overwriteEnv(env, "AWS_DEFAULT_PROFILE", input.Profile)
if input.WriteEnv {
env = overwriteEnv(env, "AWS_ACCESS_KEY_ID", val.AccessKeyID)
env = overwriteEnv(env, "AWS_SECRET_ACCESS_KEY", val.SecretAccessKey)
if val.SessionToken != "" {
env = overwriteEnv(env, "AWS_SESSION_TOKEN", val.SessionToken)
env = overwriteEnv(env, "AWS_SECURITY_TOKEN", val.SessionToken)
}
}
cmd := exec.Command(input.Command, input.Args...)
cmd.Env = env
cmd.Stdin = os.Stdin
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
go func() {
sig := <-input.Signals
if cmd.Process != nil {
cmd.Process.Signal(sig)
}
}()
var waitStatus syscall.WaitStatus
if err := cmd.Run(); err != nil {
if err != nil {
ui.Error.Println(err)
}
if exitError, ok := err.(*exec.ExitError); ok {
waitStatus = exitError.Sys().(syscall.WaitStatus)
os.Exit(waitStatus.ExitStatus())
}
}
}
// write out a config excluding role switching keys
func profileConfig(profile string) (*os.File, error) {
conf, err := parseProfiles()
if err != nil {
return nil, err
}
tmpConfig, err := ioutil.TempFile(os.TempDir(), "aws-vault")
if err != nil {
return nil, err
}
// allow some time for keychain prompt
newConfig := map[string]string{
"metadata_service_timeout": "15",
"metadata_service_num_attempts": "2",
}
for k, v := range conf[profile] {
if k != "source_profile" && k != "role_arn" {
newConfig[k] = v
}
}
return tmpConfig, writeProfiles(tmpConfig, profiles{profile: newConfig})
}
func overwriteEnv(env []string, key, val string) []string {
var found bool
for idx, e := range env {
if strings.HasPrefix(key+"=", e) {
env[idx] = key + "=" + val
found = true
} else {
env[idx] = e
}
}
if !found {
env = append(env, key+"="+val)
}
return env
}
func connectProxy(w http.ResponseWriter, r *http.Request) error {
d, err := net.Dial("tcp", r.RequestURI)
if err != nil {
return err
}
hj, ok := w.(http.Hijacker)
if !ok {
return err
}
conn, bufrw, err := hj.Hijack()
if err != nil {
return err
}
defer conn.Close()
defer d.Close()
bufrw.WriteString("HTTP/1.0 200 Connection established\r\n\r\n")
bufrw.Flush()
go io.Copy(d, conn)
io.Copy(conn, d)
return nil
}
func proxyHandler(upstream http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
log.Printf("%s %s", r.Method, r.RequestURI)
if r.Method == "GET" && strings.HasPrefix(r.URL.Path, "/latest/meta-data") {
upstream.ServeHTTP(w, r)
} else if r.Method == "CONNECT" {
if err := connectProxy(w, r); err != nil {
http.Error(w, "Error connecting to proxy: "+err.Error(), http.StatusGatewayTimeout)
}
} else {
proxy := &httputil.ReverseProxy{Director: func(req *http.Request) {
req.Method = "GET"
req.URL.Scheme = "http"
req.URL.Host = r.Host
}}
proxy.ServeHTTP(w, r)
}
})
}