Added a convertor for OpenSSH keys.

securesystemslib/convert/ssh.py

@@ -0,0 +1,48 @@
+import re
+import typing
+
+from cryptography.hazmat.primitives.serialization.ssh import (
+    load_ssh_private_key,
+    load_ssh_public_key,
+)
+
+from .hazmat import import_hazmat_key
+
+openssh_text_format_marker_re = re.compile(
+    b"^-{2,}BEGIN OPENSSH PRIVATE KEY-{2,}$"
+)
+
+
+def import_ssh_key(
+    key: typing.Union[str, bytes], password: typing.Optional[bytes] = None
+):
+    """
+    <Purpose>
+      Imports either a public or a private key in OpenSSH format
+
+    <Arguments>
+      key:
+        A string in OpenSSH format, usually Base64-encoded.
+
+    <Exceptions>
+      securesystemslib.exceptions.FormatError, if the arguments are improperly
+      formatted.
+
+      securesystemslib.exceptions.UnsupportedAlgorithmError, if 'pem' specifies
+      an unsupported key type.
+
+    <Side Effects>
+      None.
+
+    <Returns>
+      A dictionary containing the keys, conforming to 'securesystemslib.formats.KEY_SCHEMA'.
+    """
+
+    if isinstance(key, str):
+        key = key.encode("utf-8")
+
+    firstLine, _ = key.split(b"\n", 1)
+    if openssh_text_format_marker_re.match(firstLine):
+        return import_hazmat_key(load_ssh_private_key(key, None))
+    else:
+        return import_hazmat_key(load_ssh_public_key(key))

tests/data/ssh/ecdsa

@@ -0,0 +1,9 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAaAAAABNlY2RzYS
+1zaGEyLW5pc3RwMjU2AAAACG5pc3RwMjU2AAAAQQRIz8F5gDezWgzdlRn5Upj7B1NoK43R
+wP1d/oiCtNKSYDdql9ds3d+5zzEhnhWvdjGOn1sKwAFlbkz+aueExAkvAAAAqGkmJORpJi
+TkAAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEjPwXmAN7NaDN2V
+GflSmPsHU2grjdHA/V3+iIK00pJgN2qX12zd37nPMSGeFa92MY6fWwrAAWVuTP5q54TECS
+8AAAAhAMfqco7t7Cdz3rXsPcUwOINw4CKTqyTpOCFTzjULEB6AAAAACWVjZHNhIGtleQEC
+AwQFBg==
+-----END OPENSSH PRIVATE KEY-----

tests/data/ssh/ecdsa.pub

@@ -0,0 +1 @@
+ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBEjPwXmAN7NaDN2VGflSmPsHU2grjdHA/V3+iIK00pJgN2qX12zd37nPMSGeFa92MY6fWwrAAWVuTP5q54TECS8= ecdsa key

tests/data/ssh/ed25519

@@ -0,0 +1,7 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACAUMmZQY7F/6Pvhj+LQn6HLke1TI0L1qvVImeBCxKjFuAAAAJAh8wZwIfMG
+cAAAAAtzc2gtZWQyNTUxOQAAACAUMmZQY7F/6Pvhj+LQn6HLke1TI0L1qvVImeBCxKjFuA
+AAAED6uVRyKJZMvslMIFpm4nbqMcRlzza7VwJobiRcbLNwSBQyZlBjsX/o++GP4tCfocuR
+7VMjQvWq9UiZ4ELEqMW4AAAAC2VkMjU1MTkga2V5AQI=
+-----END OPENSSH PRIVATE KEY-----

tests/data/ssh/ed25519.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBQyZlBjsX/o++GP4tCfocuR7VMjQvWq9UiZ4ELEqMW4 ed25519 key

tests/data/ssh/generate.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+types="ecdsa ed25519 rsa"  # dsa
+
+for t in $types; do
+    yes | ssh-keygen -t $t -C "$t key" -N "" -f ./$t;
+done

tests/data/ssh/rsa

@@ -0,0 +1,38 @@
+-----BEGIN OPENSSH PRIVATE KEY-----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+-----END OPENSSH PRIVATE KEY-----

tests/data/ssh/rsa.pub

@@ -0,0 +1 @@
+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABgQCzzjkzJGZjENWuFFpjhhK7y+YpMMST18lCK28dlG3QbqbpVJggC+3DcpD4GfFVHTEUpJWplatF4nlpHrzQTc/8RhJzVg+FY3hZXRdxX5J5zJ5vW1aTQdduj0AGMQ0RRaFQo3o5fGMQdrthDUW1/9ybGF0sv4DlTH0rtR8yCvXpl0LmaCIn0MireG8SqsaxdYDb8KdbOHL8Ezo2UmqZg0+svwkphEFoFzqQYVNAhgG4+/5Yotl2PBxZrSUWEUApqvWSS5BeyT/cTnf/8XDGV64H2Qmw9nZhRTIan6GgTgzPOhaX3yUxXS4ZI5rnWRQJuOk/J6FVKsJFNVA+/BAsxjcbUpms+PUtrXe+mHMLcb9FvQAiR9oteNMWUM3X1H8hVRZ20ETTzZVXM44mbSJ+ZvBEcpsGo9RmaMnvsc+4QI9ak/wEojPGN1msNXh/R8RWnhG+sCkbM9Btf2wf1RUyxtpkpYksbcDVyQEl+Rr6x2M+sJH9KZCzS9OFL8hZHKsCAks= rsa key

tests/test_openssh.py

@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+"""
+<Program Name>
+  test_openssh.py
+
+<Author>
+  KOLANICH
+
+<Started>
+  Nov 15, 2017
+
+<Copyright>
+  See LICENSE for licensing information.
+
+<Purpose>
+  Test OpenSSH-related functions.
+
+"""
+
+import sys
+import unittest
+from pathlib import Path
+
+this_dir = Path(__file__).resolve().absolute().parent
+keys_dir = this_dir / "data" / "ssh"
+
+# pylint: disable=wrong-import-position
+from securesystemslib.convert.ssh import import_ssh_key
+from securesystemslib.keys import create_signature, verify_signature
+
+TEST_DATA = b"test"
+
+
+class TestOpenSSH(unittest.TestCase):
+    def test_openssh_import_and_sign_and_verify(self):
+        files = sorted(set(keys_dir.glob("*.pub")))
+        for pub_f in files:
+            sec_f = pub_f.parent / pub_f.stem
+            with self.subTest(pub_f=pub_f, sec_f=sec_f):
+                pub = import_ssh_key(pub_f.read_text(), None)
+                sec = import_ssh_key(sec_f.read_text(), None)
+                signature = create_signature(sec, TEST_DATA)
+                self.assertTrue(verify_signature(pub, signature, TEST_DATA))
+
+
+if __name__ == "__main__":
+    unittest.main()