53 lines
1.1 KiB
Go
53 lines
1.1 KiB
Go
// +build linux
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package keys
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import (
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"fmt"
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"strconv"
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"strings"
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"github.com/pkg/errors"
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"golang.org/x/sys/unix"
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)
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type KeySerial uint32
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func JoinSessionKeyring(name string) (KeySerial, error) {
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sessKeyId, err := unix.KeyctlJoinSessionKeyring(name)
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if err != nil {
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return 0, errors.Wrap(err, "create session key")
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}
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return KeySerial(sessKeyId), nil
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}
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// ModKeyringPerm modifies permissions on a keyring by reading the current permissions,
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// anding the bits with the given mask (clearing permissions) and setting
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// additional permission bits
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func ModKeyringPerm(ringId KeySerial, mask, setbits uint32) error {
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dest, err := unix.KeyctlString(unix.KEYCTL_DESCRIBE, int(ringId))
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if err != nil {
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return err
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}
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res := strings.Split(dest, ";")
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if len(res) < 5 {
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return fmt.Errorf("Destination buffer for key description is too small")
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}
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// parse permissions
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perm64, err := strconv.ParseUint(res[3], 16, 32)
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if err != nil {
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return err
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}
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perm := (uint32(perm64) & mask) | setbits
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if err := unix.KeyctlSetperm(int(ringId), perm); err != nil {
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return err
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}
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return nil
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}
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