Merge pull request #2369 from JeffWDH/current

T5661: Add show show ssh dynamic-protection attacker and show log ssh…

1 files changed, 100 insertions, 0 deletions

diff --git a/src/op_mode/ssh.py b/src/op_mode/ssh.py
new file mode 100755
index 000000000..c09b2166f
--- /dev/null
+++ b/src/op_mode/ssh.py
@@ -0,0 +1,100 @@
+#!/usr/bin/env python3
+#
+# Copyright 2017-2023 VyOS maintainers and contributors <maintainers@vyos.io>
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library.  If not, see <http://www.gnu.org/licenses/>.
+
+import json
+import sys
+import glob
+import vyos.opmode
+from vyos.utils.process import cmd
+from vyos.configquery import ConfigTreeQuery
+from tabulate import tabulate
+
+def show_fingerprints(raw: bool, ascii: bool):
+    config = ConfigTreeQuery()
+    if not config.exists("service ssh"):
+        raise vyos.opmode.UnconfiguredSubsystem("SSH server is not enabled.")
+
+    publickeys = glob.glob("/etc/ssh/*.pub")
+
+    if publickeys:
+        keys = []
+        for keyfile in publickeys:
+            try:
+                if ascii:
+                    keydata = cmd("ssh-keygen -l -v -E sha256 -f " + keyfile).splitlines()
+                else:
+                    keydata = cmd("ssh-keygen -l -E sha256 -f " + keyfile).splitlines()
+                type = keydata[0].split(None)[-1].strip("()")
+                key_size = keydata[0].split(None)[0]
+                fingerprint = keydata[0].split(None)[1]
+                comment = keydata[0].split(None)[2:-1][0]
+                if ascii:
+                    ascii_art = "\n".join(keydata[1:])
+                    keys.append({"type": type, "key_size": key_size, "fingerprint": fingerprint, "comment": comment, "ascii_art": ascii_art})
+                else:
+                    keys.append({"type": type, "key_size": key_size, "fingerprint": fingerprint, "comment": comment})
+            except:
+                # Ignore invalid public keys
+                pass
+        if raw:
+            return keys
+        else:
+            headers = {"type": "Type", "key_size": "Key Size", "fingerprint": "Fingerprint", "comment": "Comment", "ascii_art": "ASCII Art"}
+            output = "SSH server public key fingerprints:\n\n" + tabulate(keys, headers=headers, tablefmt="simple")
+            return output
+    else:
+        if raw:
+            return []
+        else:
+            return "No SSH server public keys are found."
+
+def show_dynamic_protection(raw: bool):
+    config = ConfigTreeQuery()
+    if not config.exists("service ssh dynamic-protection"):
+        raise vyos.opmode.UnconfiguredSubsystem("SSH server dynamic-protection is not enabled.")
+
+    attackers = []
+    try:
+        # IPv4
+        attackers = attackers + json.loads(cmd("sudo nft -j list set ip sshguard attackers"))["nftables"][1]["set"]["elem"]
+    except:
+        pass
+    try:
+        # IPv6
+        attackers = attackers + json.loads(cmd("sudo nft -j list set ip6 sshguard attackers"))["nftables"][1]["set"]["elem"]
+    except:
+        pass
+    if attackers:
+        if raw:
+            return attackers
+        else:
+            output = "Blocked attackers:\n" + "\n".join(attackers)
+            return output
+    else:
+        if raw:
+            return []
+        else:
+            return "No blocked attackers."
+
+if __name__ == '__main__':
+    try:
+        res = vyos.opmode.run(sys.modules[__name__])
+        if res:
+            print(res)
+    except (ValueError, vyos.opmode.Error) as e:
+        print(e)
+        sys.exit(1)