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79c5ac14b2
* many: remove usages of deprecated io/ioutil package Signed-off-by: Miguel Pires <miguel.pires@canonical.com> * .golangci.yml: remove errcheck ignore rule for io/ioutil Signed-off-by: Miguel Pires <miguel.pires@canonical.com> * run-checks: prevent new usages of io/ioutil Signed-off-by: Miguel Pires <miguel.pires@canonical.com> --------- Signed-off-by: Miguel Pires <miguel.pires@canonical.com>
65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
// -*- Mode: Go; indent-tabs-mode: t -*-
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/*
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* Copyright (C) 2020 Canonical Ltd
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 3 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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package randutil
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import (
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cryptorand "crypto/rand"
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"encoding/base64"
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"fmt"
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"os"
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"strings"
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)
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// CryptoTokenBytes returns a crypthographically secure token of
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// nbytes random bytes.
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func CryptoTokenBytes(nbytes int) ([]byte, error) {
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b := make([]byte, nbytes)
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_, err := cryptorand.Read(b)
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if err != nil {
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return nil, fmt.Errorf("cannot obtain %d crypto random bytes: %v", nbytes, err)
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}
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return b, nil
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}
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// CryptoToken returns a crypthographically secure token string
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// encoding nbytes random bytes.
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// The result is URL-safe.
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func CryptoToken(nbytes int) (string, error) {
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b, err := CryptoTokenBytes(nbytes)
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if err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(b), nil
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}
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// Allow mocking of the path through an exported reference.
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var kernelUUIDPath = "/proc/sys/kernel/random/uuid"
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// RandomKernelUUID will return a UUID from the kernel's procfs API at
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// /proc/sys/kernel/random/uuid. Only to be used in very specific uses, most
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// random code should use CryptoToken(Bytes) instead.
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func RandomKernelUUID() (string, error) {
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b, err := os.ReadFile(kernelUUIDPath)
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if err != nil {
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return "", fmt.Errorf("cannot read kernel generated uuid: %w", err)
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}
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return strings.TrimSpace(string(b)), nil
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}
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