From 943613a194ee76be9a73eedcb82c0036bb37b3f0 Mon Sep 17 00:00:00 2001
From: Nic West <nic@letolab.com>
Date: Tue, 21 Apr 2015 17:05:52 +0100
Subject: [PATCH] add thing for when known hosts have changed

---
 tests/rules/test_ssh_known_host.py | 74 ++++++++++++++++++++++++++++++
 thefuck/rules/ssh_known_hosts.py   | 38 +++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 tests/rules/test_ssh_known_host.py
 create mode 100644 thefuck/rules/ssh_known_hosts.py

diff --git a/tests/rules/test_ssh_known_host.py b/tests/rules/test_ssh_known_host.py
new file mode 100644
index 00000000..74a81469
--- /dev/null
+++ b/tests/rules/test_ssh_known_host.py
@@ -0,0 +1,74 @@
+import os
+import pytest
+from thefuck.main import Command
+from thefuck.rules.ssh_known_hosts import match, get_new_command, remove_offending_keys
+
+
+@pytest.fixture
+def ssh_error(tmpdir):
+    path = os.path.join(str(tmpdir), 'known_hosts')
+
+    def reset(path):
+        with open(path, 'w') as fh:
+            lines = [
+                '123.234.567.890 asdjkasjdakjsd\n'
+                '98.765.432.321 ejioweojwejrosj\n'
+                '111.222.333.444 qwepoiwqepoiss\n'
+            ]
+            fh.writelines(lines)
+
+    def known_hosts(path):
+        with open(path, 'r') as fh:
+            return fh.readlines()
+
+    reset(path)
+
+    errormsg = u"""@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
+@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
+IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
+Someone could be eavesdropping on you right now (man-in-the-middle attack)!
+It is also possible that a host key has just been changed.
+The fingerprint for the RSA key sent by the remote host is
+b6:cb:07:34:c0:a0:94:d3:0d:69:83:31:f4:c5:20:9b.
+Please contact your system administrator.
+Add correct host key in {0} to get rid of this message.
+Offending RSA key in {0}:2
+RSA host key for {1} has changed and you have requested strict checking.
+Host key verification failed.""".format(path, '98.765.432.321')
+
+    return errormsg, path, reset, known_hosts
+
+
+def test_match(ssh_error):
+    errormsg, _, _, _ = ssh_error    
+    assert match(Command('ssh', '', errormsg), None)
+    assert match(Command('ssh', '', errormsg), None)
+    assert match(Command('scp something something', '', errormsg), None)
+    assert match(Command('scp something something', '', errormsg), None)
+    assert not match(Command('', '', errormsg), None)
+    assert not match(Command('notssh', '', errormsg), None)
+    assert not match(Command('ssh', '', ''), None)
+
+
+def test_remove_offending_keys(ssh_error):
+    errormsg, path, reset, known_hosts = ssh_error
+    command = Command('ssh user@host', '', errormsg)
+    remove_offending_keys(command, None)
+    expected =['123.234.567.890 asdjkasjdakjsd\n', '111.222.333.444 qwepoiwqepoiss\n']
+    assert known_hosts(path) == expected
+
+
+def test_get_new_command(ssh_error, monkeypatch):
+    errormsg, _, _, _ = ssh_error
+
+    class Mock:
+        was_called = False
+
+        def __call__(self, *args, **kwargs):
+            self.was_called = True
+
+    method = Mock()
+    monkeypatch.setattr('thefuck.rules.ssh_known_hosts.remove_offending_keys', method)
+    assert get_new_command(Command('ssh user@host', '', errormsg), None) == 'ssh user@host'
+    assert method.was_called
diff --git a/thefuck/rules/ssh_known_hosts.py b/thefuck/rules/ssh_known_hosts.py
new file mode 100644
index 00000000..2f425bfe
--- /dev/null
+++ b/thefuck/rules/ssh_known_hosts.py
@@ -0,0 +1,38 @@
+import re
+patterns = [
+    r'WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!',
+    r'WARNING: POSSIBLE DNS SPOOFING DETECTED!',
+    r"Warning: the \S+ host key for '([^']+)' differs from the key for the IP address '([^']+)'",
+]
+offending_pattern = re.compile(
+    r'(?:Offending (?:key for IP|\S+ key)|Matching host key) in ([^:]+):(\d+)',
+    re.MULTILINE)
+
+commands = ['ssh', 'scp']
+
+
+def match(command, settings):
+    if not command.script:
+        return False
+    if not command.script.split()[0] in commands:
+        return False
+    if not any([re.findall(pattern, command.stderr) for pattern in patterns]):
+        return False
+    return True
+
+
+def remove_offending_keys(command, settings):
+    offending = offending_pattern.findall(command.stderr)
+    print offending
+    for filepath, lineno in offending:
+        with open(filepath, 'r') as fh:
+            lines = fh.readlines()
+            del lines[int(lineno) - 1]
+            print lines
+        with open(filepath, 'w') as fh:
+            fh.writelines(lines)
+
+
+def get_new_command(command, settings):
+    remove_offending_keys(command, settings)
+    return command.script