92 lines
1.9 KiB
Go
92 lines
1.9 KiB
Go
package auth
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import (
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"bytes"
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"context"
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"crypto/rand"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"log/slog"
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"os"
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"path/filepath"
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"strings"
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"golang.org/x/crypto/ssh"
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)
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const defaultPrivateKey = "id_ed25519"
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func keyPath() (string, error) {
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home, err := os.UserHomeDir()
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if err != nil {
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return "", err
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}
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return filepath.Join(home, ".ollama", defaultPrivateKey), nil
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}
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func GetPublicKey() (string, error) {
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keyPath, err := keyPath()
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if err != nil {
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return "", err
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}
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privateKeyFile, err := os.ReadFile(keyPath)
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if err != nil {
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slog.Info(fmt.Sprintf("Failed to load private key: %v", err))
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return "", err
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}
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privateKey, err := ssh.ParsePrivateKey(privateKeyFile)
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if err != nil {
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return "", err
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}
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publicKey := ssh.MarshalAuthorizedKey(privateKey.PublicKey())
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return strings.TrimSpace(string(publicKey)), nil
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}
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func NewNonce(r io.Reader, length int) (string, error) {
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nonce := make([]byte, length)
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if _, err := io.ReadFull(r, nonce); err != nil {
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return "", err
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}
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return base64.RawURLEncoding.EncodeToString(nonce), nil
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}
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func Sign(ctx context.Context, bts []byte) (string, error) {
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keyPath, err := keyPath()
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if err != nil {
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return "", err
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}
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privateKeyFile, err := os.ReadFile(keyPath)
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if err != nil {
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slog.Info(fmt.Sprintf("Failed to load private key: %v", err))
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return "", err
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}
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privateKey, err := ssh.ParsePrivateKey(privateKeyFile)
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if err != nil {
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return "", err
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}
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// get the pubkey, but remove the type
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publicKey := ssh.MarshalAuthorizedKey(privateKey.PublicKey())
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parts := bytes.Split(publicKey, []byte(" "))
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if len(parts) < 2 {
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return "", errors.New("malformed public key")
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}
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signedData, err := privateKey.Sign(rand.Reader, bts)
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if err != nil {
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return "", err
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}
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// signature is <pubkey>:<signature>
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return fmt.Sprintf("%s:%s", bytes.TrimSpace(parts[1]), base64.StdEncoding.EncodeToString(signedData.Blob)), nil
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}
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