275 lines
6.8 KiB
Go
275 lines
6.8 KiB
Go
package postgresql
|
|
|
|
import (
|
|
"database/sql"
|
|
"fmt"
|
|
"strings"
|
|
|
|
"github.com/hashicorp/vault/helper/strutil"
|
|
"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)
|
|
if !ok {
|
|
return nil, fmt.Errorf("usernameRaw is not a 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)
|
|
if !ok {
|
|
return nil, fmt.Errorf("usernameRaw is not a string")
|
|
}
|
|
var revocationSQL string
|
|
var resp *logical.Response
|
|
|
|
roleNameRaw, ok := req.Secret.InternalData["role"]
|
|
if ok {
|
|
role, err := b.Role(req.Storage, roleNameRaw.(string))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if role == nil {
|
|
if resp == nil {
|
|
resp = &logical.Response{}
|
|
}
|
|
resp.AddWarning(fmt.Sprintf("Role %q cannot be found. Using default revocation SQL.", roleNameRaw.(string)))
|
|
} else {
|
|
revocationSQL = role.RevocationSQL
|
|
}
|
|
}
|
|
|
|
// Get our connection
|
|
db, err := b.DB(req.Storage)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
switch revocationSQL {
|
|
|
|
// This is the default revocation logic. If revocation SQL is provided it
|
|
// is simply executed as-is.
|
|
case "":
|
|
// Check if the role exists
|
|
var exists bool
|
|
err = db.QueryRow("SELECT exists (SELECT rolname FROM pg_roles WHERE rolname=$1);", username).Scan(&exists)
|
|
if err != nil && err != sql.ErrNoRows {
|
|
return nil, err
|
|
}
|
|
|
|
if exists == false {
|
|
return resp, nil
|
|
}
|
|
|
|
// 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("SELECT DISTINCT table_schema FROM information_schema.role_column_grants WHERE grantee=$1;")
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer stmt.Close()
|
|
|
|
rows, err := stmt.Query(username)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer rows.Close()
|
|
|
|
const initialNumRevocations = 16
|
|
revocationStmts := make([]string, 0, initialNumRevocations)
|
|
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;`,
|
|
pq.QuoteIdentifier(schema),
|
|
pq.QuoteIdentifier(username)))
|
|
|
|
revocationStmts = append(revocationStmts, fmt.Sprintf(
|
|
`REVOKE USAGE ON SCHEMA %s FROM %s;`,
|
|
pq.QuoteIdentifier(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 ALL PRIVILEGES ON ALL SEQUENCES 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;`,
|
|
pq.QuoteIdentifier(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
|
|
}
|
|
defer stmt.Close()
|
|
_, 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
|
|
}
|
|
|
|
// We have revocation SQL, execute directly, within a transaction
|
|
default:
|
|
tx, err := db.Begin()
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer func() {
|
|
tx.Rollback()
|
|
}()
|
|
|
|
for _, query := range strutil.ParseArbitraryStringSlice(revocationSQL, ";") {
|
|
query = strings.TrimSpace(query)
|
|
if len(query) == 0 {
|
|
continue
|
|
}
|
|
|
|
stmt, err := tx.Prepare(Query(query, map[string]string{
|
|
"name": username,
|
|
}))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
defer stmt.Close()
|
|
|
|
if _, err := stmt.Exec(); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
if err := tx.Commit(); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
return resp, nil
|
|
}
|