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package dbcrypt
import (
"context"
"database/sql"
"golang.org/x/xerrors"
"cdr.dev/slog"
"github.com/coder/coder/v2/coderd/database"
)
// Rotate rotates the database encryption keys by re-encrypting all user tokens
// with the first cipher and revoking all other ciphers.
func Rotate(ctx context.Context, log slog.Logger, sqlDB *sql.DB, ciphers []Cipher) error {
db := database.New(sqlDB)
cryptDB, err := New(ctx, db, ciphers...)
if err != nil {
return xerrors.Errorf("create cryptdb: %w", err)
}
userIDs, err := db.AllUserIDs(ctx)
if err != nil {
return xerrors.Errorf("get users: %w", err)
}
log.Info(ctx, "encrypting user tokens", slog.F("user_count", len(userIDs)))
for idx, uid := range userIDs {
err := cryptDB.InTx(func(cryptTx database.Store) error {
userLinks, err := cryptTx.GetUserLinksByUserID(ctx, uid)
if err != nil {
return xerrors.Errorf("get user links for user: %w", err)
}
for _, userLink := range userLinks {
if userLink.OAuthAccessTokenKeyID.String == ciphers[0].HexDigest() && userLink.OAuthRefreshTokenKeyID.String == ciphers[0].HexDigest() {
log.Debug(ctx, "skipping user link", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
continue
}
if _, err := cryptTx.UpdateUserLink(ctx, database.UpdateUserLinkParams{
OAuthAccessToken: userLink.OAuthAccessToken,
OAuthAccessTokenKeyID: sql.NullString{}, // dbcrypt will update as required
OAuthRefreshToken: userLink.OAuthRefreshToken,
OAuthRefreshTokenKeyID: sql.NullString{}, // dbcrypt will update as required
OAuthExpiry: userLink.OAuthExpiry,
UserID: uid,
LoginType: userLink.LoginType,
}); err != nil {
return xerrors.Errorf("update user link user_id=%s linked_id=%s: %w", userLink.UserID, userLink.LinkedID, err)
}
}
externalAuthLinks, err := cryptTx.GetExternalAuthLinksByUserID(ctx, uid)
if err != nil {
return xerrors.Errorf("get git auth links for user: %w", err)
}
for _, externalAuthLink := range externalAuthLinks {
if externalAuthLink.OAuthAccessTokenKeyID.String == ciphers[0].HexDigest() && externalAuthLink.OAuthRefreshTokenKeyID.String == ciphers[0].HexDigest() {
log.Debug(ctx, "skipping external auth link", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
continue
}
if _, err := cryptTx.UpdateExternalAuthLink(ctx, database.UpdateExternalAuthLinkParams{
ProviderID: externalAuthLink.ProviderID,
UserID: uid,
UpdatedAt: externalAuthLink.UpdatedAt,
OAuthAccessToken: externalAuthLink.OAuthAccessToken,
OAuthAccessTokenKeyID: sql.NullString{}, // dbcrypt will update as required
OAuthRefreshToken: externalAuthLink.OAuthRefreshToken,
OAuthRefreshTokenKeyID: sql.NullString{}, // dbcrypt will update as required
OAuthExpiry: externalAuthLink.OAuthExpiry,
OAuthExtra: externalAuthLink.OAuthExtra,
}); err != nil {
return xerrors.Errorf("update external auth link user_id=%s provider_id=%s: %w", externalAuthLink.UserID, externalAuthLink.ProviderID, err)
}
}
return nil
}, &sql.TxOptions{
Isolation: sql.LevelRepeatableRead,
})
if err != nil {
return xerrors.Errorf("update user links: %w", err)
}
log.Debug(ctx, "encrypted user tokens", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
}
// Revoke old keys
for _, c := range ciphers[1:] {
if err := db.RevokeDBCryptKey(ctx, c.HexDigest()); err != nil {
return xerrors.Errorf("revoke key: %w", err)
}
log.Info(ctx, "revoked unused key", slog.F("digest", c.HexDigest()))
}
return nil
}
// Decrypt decrypts all user tokens and revokes all ciphers.
func Decrypt(ctx context.Context, log slog.Logger, sqlDB *sql.DB, ciphers []Cipher) error {
db := database.New(sqlDB)
cdb, err := New(ctx, db, ciphers...)
if err != nil {
return xerrors.Errorf("create cryptdb: %w", err)
}
// HACK: instead of adding logic to configure the primary cipher, we just
// set it to the empty string so that it will not encrypt anything.
cryptDB, ok := cdb.(*dbCrypt)
if !ok {
return xerrors.Errorf("developer error: dbcrypt.New did not return *dbCrypt")
}
cryptDB.primaryCipherDigest = ""
userIDs, err := db.AllUserIDs(ctx)
if err != nil {
return xerrors.Errorf("get users: %w", err)
}
log.Info(ctx, "decrypting user tokens", slog.F("user_count", len(userIDs)))
for idx, uid := range userIDs {
err := cryptDB.InTx(func(tx database.Store) error {
userLinks, err := tx.GetUserLinksByUserID(ctx, uid)
if err != nil {
return xerrors.Errorf("get user links for user: %w", err)
}
for _, userLink := range userLinks {
if !userLink.OAuthAccessTokenKeyID.Valid && !userLink.OAuthRefreshTokenKeyID.Valid {
log.Debug(ctx, "skipping user link", slog.F("user_id", uid), slog.F("current", idx+1))
continue
}
if _, err := tx.UpdateUserLink(ctx, database.UpdateUserLinkParams{
OAuthAccessToken: userLink.OAuthAccessToken,
OAuthAccessTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
OAuthRefreshToken: userLink.OAuthRefreshToken,
OAuthRefreshTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
OAuthExpiry: userLink.OAuthExpiry,
UserID: uid,
LoginType: userLink.LoginType,
}); err != nil {
return xerrors.Errorf("update user link user_id=%s linked_id=%s: %w", userLink.UserID, userLink.LinkedID, err)
}
}
externalAuthLinks, err := tx.GetExternalAuthLinksByUserID(ctx, uid)
if err != nil {
return xerrors.Errorf("get git auth links for user: %w", err)
}
for _, externalAuthLink := range externalAuthLinks {
if !externalAuthLink.OAuthAccessTokenKeyID.Valid && !externalAuthLink.OAuthRefreshTokenKeyID.Valid {
log.Debug(ctx, "skipping external auth link", slog.F("user_id", uid), slog.F("current", idx+1))
continue
}
if _, err := tx.UpdateExternalAuthLink(ctx, database.UpdateExternalAuthLinkParams{
ProviderID: externalAuthLink.ProviderID,
UserID: uid,
UpdatedAt: externalAuthLink.UpdatedAt,
OAuthAccessToken: externalAuthLink.OAuthAccessToken,
OAuthAccessTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
OAuthRefreshToken: externalAuthLink.OAuthRefreshToken,
OAuthRefreshTokenKeyID: sql.NullString{}, // we explicitly want to clear the key id
OAuthExpiry: externalAuthLink.OAuthExpiry,
OAuthExtra: externalAuthLink.OAuthExtra,
}); err != nil {
return xerrors.Errorf("update external auth link user_id=%s provider_id=%s: %w", externalAuthLink.UserID, externalAuthLink.ProviderID, err)
}
}
return nil
}, &sql.TxOptions{
Isolation: sql.LevelRepeatableRead,
})
if err != nil {
return xerrors.Errorf("update user links: %w", err)
}
log.Debug(ctx, "decrypted user tokens", slog.F("user_id", uid), slog.F("current", idx+1), slog.F("cipher", ciphers[0].HexDigest()))
}
// Revoke _all_ keys
for _, c := range ciphers {
if err := db.RevokeDBCryptKey(ctx, c.HexDigest()); err != nil {
return xerrors.Errorf("revoke key: %w", err)
}
log.Info(ctx, "revoked unused key", slog.F("digest", c.HexDigest()))
}
return nil
}
// nolint: gosec
const sqlDeleteEncryptedUserTokens = `
BEGIN;
DELETE FROM user_links
WHERE oauth_access_token_key_id IS NOT NULL
OR oauth_refresh_token_key_id IS NOT NULL;
DELETE FROM external_auth_links
WHERE oauth_access_token_key_id IS NOT NULL
OR oauth_refresh_token_key_id IS NOT NULL;
COMMIT;
`
// Delete deletes all user tokens and revokes all ciphers.
// This is a destructive operation and should only be used
// as a last resort, for example, if the database encryption key has been
// lost.
func Delete(ctx context.Context, log slog.Logger, sqlDB *sql.DB) error {
store := database.New(sqlDB)
_, err := sqlDB.ExecContext(ctx, sqlDeleteEncryptedUserTokens)
if err != nil {
return xerrors.Errorf("delete user links: %w", err)
}
log.Info(ctx, "deleted encrypted user tokens")
log.Info(ctx, "revoking all active keys")
keys, err := store.GetDBCryptKeys(ctx)
if err != nil {
return xerrors.Errorf("get db crypt keys: %w", err)
}
for _, k := range keys {
if !k.ActiveKeyDigest.Valid {
continue
}
if err := store.RevokeDBCryptKey(ctx, k.ActiveKeyDigest.String); err != nil {
return xerrors.Errorf("revoke key: %w", err)
}
log.Info(ctx, "revoked unused key", slog.F("digest", k.ActiveKeyDigest.String))
}
return nil
}