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sessions.go
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sessions.go
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package vault
import (
"crypto/md5"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"log"
"regexp"
"time"
"github.com/99designs/keyring"
"github.com/aws/aws-sdk-go/service/sts"
)
var sessionKeyPattern = regexp.MustCompile(`^(.+?) session \((\d+)\)$`)
func IsSessionKey(s string) bool {
return sessionKeyPattern.MatchString(s)
}
func parseSessionKey(s string) (string, string) {
matches := sessionKeyPattern.FindStringSubmatch(s)
if len(matches) == 0 {
return "", ""
}
return matches[1], matches[2]
}
type KeyringSession struct {
Profile
SessionID string
}
type KeyringSessions struct {
Keyring keyring.Keyring
Config *Config
}
func NewKeyringSessions(k keyring.Keyring, cfg *Config) (*KeyringSessions, error) {
return &KeyringSessions{
Keyring: k,
Config: cfg,
}, nil
}
func (s *KeyringSessions) Sessions(profileName string) ([]KeyringSession, error) {
log.Printf("Looking up all keys in keyring")
accounts, err := s.Keyring.Keys()
if err != nil {
return nil, err
}
var sessions []KeyringSession
profile, _ := s.Config.Profile(profileName)
for _, account := range accounts {
sessionProfile, sessionID := parseSessionKey(account)
if sessionProfile == profile.Name {
log.Printf("Session %q matches profile %q", account, profile.Name)
sessions = append(sessions, KeyringSession{
Profile: profile,
SessionID: sessionID,
})
}
}
return sessions, nil
}
func (s *KeyringSessions) key(profileName string, duration time.Duration) string {
source, _ := s.Config.SourceProfile(profileName)
hasher := md5.New()
hasher.Write([]byte(duration.String()))
sourceHash, err := source.Hash()
if err != nil {
log.Panicf("Error hashing profile %q: %v", profileName, err)
}
hasher.Write(sourceHash)
return fmt.Sprintf("%s session (%x)", source.Name, hex.EncodeToString(hasher.Sum(nil))[0:10])
}
func (s *KeyringSessions) Retrieve(profile string, duration time.Duration) (session sts.Credentials, err error) {
log.Printf("Looking for sessions for %s / %v", profile, duration)
item, err := s.Keyring.Get(s.key(profile, duration))
if err != nil {
return session, err
}
if err = json.Unmarshal(item.Data, &session); err != nil {
return session, err
}
if session.Expiration.Before(time.Now()) {
return session, errors.New("Session is expired")
}
return
}
func (s *KeyringSessions) Store(profile string, session sts.Credentials, duration time.Duration) error {
bytes, err := json.Marshal(session)
if err != nil {
return err
}
log.Printf("Writing session for %s to keyring", profile)
return s.Keyring.Set(keyring.Item{
Key: s.key(profile, duration),
Label: "aws-vault session for " + profile,
Description: "aws-vault session for " + profile,
Data: bytes,
TrustSelf: false,
})
}
func (s *KeyringSessions) Delete(profileName string) (n int, err error) {
log.Printf("Looking up all keys in keyring")
keys, err := s.Keyring.Keys()
if err != nil {
return n, err
}
profile, _ := s.Config.Profile(profileName)
for _, k := range keys {
sessionProfile, _ := parseSessionKey(k)
if sessionProfile == profile.Name {
log.Printf("Session %q matches profile %q", k, profile.Name)
if err = s.Keyring.Remove(k); err != nil {
return n, err
}
n++
}
}
return
}