forked from hashicorp/vault
/
secret_creds.go
192 lines (165 loc) · 4.81 KB
/
secret_creds.go
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package postgresql
import (
"database/sql"
"fmt"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
"github.com/lib/pq"
)
const SecretCredsType = "creds"
func secretCreds(b *backend) *framework.Secret {
return &framework.Secret{
Type: SecretCredsType,
Fields: map[string]*framework.FieldSchema{
"username": &framework.FieldSchema{
Type: framework.TypeString,
Description: "Username",
},
"password": &framework.FieldSchema{
Type: framework.TypeString,
Description: "Password",
},
},
Renew: b.secretCredsRenew,
Revoke: b.secretCredsRevoke,
}
}
func (b *backend) secretCredsRenew(
req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
// Get the username from the internal data
usernameRaw, ok := req.Secret.InternalData["username"]
if !ok {
return nil, fmt.Errorf("secret is missing username internal data")
}
username, ok := usernameRaw.(string)
// Get our connection
db, err := b.DB(req.Storage)
if err != nil {
return nil, err
}
// Get the lease information
lease, err := b.Lease(req.Storage)
if err != nil {
return nil, err
}
if lease == nil {
lease = &configLease{}
}
f := framework.LeaseExtend(lease.Lease, lease.LeaseMax, b.System())
resp, err := f(req, d)
if err != nil {
return nil, err
}
// Make sure we increase the VALID UNTIL endpoint for this user.
if expireTime := resp.Secret.ExpirationTime(); !expireTime.IsZero() {
expiration := expireTime.Format("2006-01-02 15:04:05-0700")
query := fmt.Sprintf(
"ALTER ROLE %s VALID UNTIL '%s';",
pq.QuoteIdentifier(username),
expiration)
stmt, err := db.Prepare(query)
if err != nil {
return nil, err
}
defer stmt.Close()
if _, err := stmt.Exec(); err != nil {
return nil, err
}
}
return resp, nil
}
func (b *backend) secretCredsRevoke(
req *logical.Request, d *framework.FieldData) (*logical.Response, error) {
// Get the username from the internal data
usernameRaw, ok := req.Secret.InternalData["username"]
if !ok {
return nil, fmt.Errorf("secret is missing username internal data")
}
username, ok := usernameRaw.(string)
// Get our connection
db, err := b.DB(req.Storage)
if err != nil {
return nil, err
}
// Query for permissions; we need to revoke permissions before we can drop
// the role
// This isn't done in a transaction because even if we fail along the way,
// we want to remove as much access as possible
stmt, err := db.Prepare(fmt.Sprintf(
"SELECT DISTINCT table_schema FROM information_schema.role_column_grants WHERE grantee='%s';",
username))
if err != nil {
return nil, err
}
defer stmt.Close()
rows, err := stmt.Query()
if err != nil {
return nil, err
}
defer rows.Close()
var revocationStmts []string
for rows.Next() {
var schema string
err = rows.Scan(&schema)
if err != nil {
// keep going; remove as many permissions as possible right now
continue
}
revocationStmts = append(revocationStmts, fmt.Sprintf(
"REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA %s FROM %s;",
schema, pq.QuoteIdentifier(username)))
revocationStmts = append(revocationStmts, fmt.Sprintf(
"REVOKE USAGE ON SCHEMA %s FROM %s;",
schema, pq.QuoteIdentifier(username)))
}
// for good measure, revoke all privileges and usage on schema public
revocationStmts = append(revocationStmts, fmt.Sprintf(
"REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA public FROM %s;",
pq.QuoteIdentifier(username)))
revocationStmts = append(revocationStmts, fmt.Sprintf(
"REVOKE USAGE ON SCHEMA public FROM %s;",
pq.QuoteIdentifier(username)))
// get the current database name so we can issue a REVOKE CONNECT for
// this username
var dbname sql.NullString
if err := db.QueryRow("SELECT current_database();").Scan(&dbname); err != nil {
return nil, err
}
if dbname.Valid {
revocationStmts = append(revocationStmts, fmt.Sprintf(
"REVOKE CONNECT ON DATABASE %s FROM %s;",
dbname.String, pq.QuoteIdentifier(username)))
}
// again, here, we do not stop on error, as we want to remove as
// many permissions as possible right now
var lastStmtError error
for _, query := range revocationStmts {
stmt, err := db.Prepare(query)
if err != nil {
lastStmtError = err
continue
}
_, err = stmt.Exec()
if err != nil {
lastStmtError = err
}
}
// can't drop if not all privileges are revoked
if rows.Err() != nil {
return nil, fmt.Errorf("could not generate revocation statements for all rows: %s", rows.Err())
}
if lastStmtError != nil {
return nil, fmt.Errorf("could not perform all revocation statements: %s", lastStmtError)
}
// Drop this user
stmt, err = db.Prepare(fmt.Sprintf(
"DROP ROLE IF EXISTS %s;", pq.QuoteIdentifier(username)))
if err != nil {
return nil, err
}
defer stmt.Close()
if _, err := stmt.Exec(); err != nil {
return nil, err
}
return nil, nil
}