login: T4751: 2FA OTP key generator in VyOS CLI

2 files changed, 167 insertions, 0 deletions

diff --git a/op-mode-definitions/generate-system-login-user.xml.in b/op-mode-definitions/generate-system-login-user.xml.in
new file mode 100755
index 000000000..d0519b6bd
--- /dev/null
+++ b/op-mode-definitions/generate-system-login-user.xml.in
@@ -0,0 +1,90 @@
+<?xml version="1.0"?>

+<interfaceDefinition>

+  <node name="generate">

+    <children>

+      <node name="system">

+        <properties>

+          <help>Generate system related parameters</help>

+        </properties>

+        <children>

+          <node name="login">

+            <properties>

+              <help>Generate system login related parameters</help>

+            </properties>

+            <children>

+              <tagNode name="username">

+                <properties>

+                  <help>Username used for authentication</help>

+                  <completionHelp>

+                    <list>&lt;username&gt;</list>

+                  </completionHelp>

+                </properties>

+                <children>

+                  <node name="otp-key">

+                    <properties>

+                      <help>Generate OpenConnect OTP token</help>

+                    </properties>

+                    <children>

+                      <node name="hotp-time">

+                        <properties>

+                          <help>HOTP time-based token</help>

+                        </properties>

+                        <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5"</command>

+                        <children>

+                          <tagNode name="rate-limit">

+                            <properties>

+                              <help>Duration of single time interval</help>

+                            </properties>

+                            <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5" --rate_limit "$9"</command>

+                            <children>

+                              <tagNode name="rate-time">

+                                <properties>

+                                  <help>The number of digits in the one-time password</help>

+                                </properties>

+                                <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5" --rate_limit "$9" --rate_time "${11}" </command>

+                                <children>

+                                  <tagNode name="window-size">

+                                    <properties>

+                                      <help>The number of digits in the one-time password</help>

+                                    </properties>

+                                    <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5" --rate_limit "$9" --rate_time "${11}" --window_size "${13}"</command>

+                                  </tagNode>

+                                </children>

+                              </tagNode>

+                            </children>

+                          </tagNode>

+                          <tagNode name="window-size">

+                            <properties>

+                              <help>The number of digits in the one-time password</help>

+                            </properties>

+                            <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5" --window_size "${9}"</command>

+                            <children>

+                              <tagNode name="rate-limit">

+                                <properties>

+                                  <help>Duration of single time interval</help>

+                                </properties>

+                                <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5" --rate_limit "${11}" --window_size "${9}"</command>

+                                <children>

+                                  <tagNode name="rate-time">

+                                    <properties>

+                                      <help>Duration of single time interval</help>

+                                    </properties>

+                                    <command>sudo ${vyos_op_scripts_dir}/generate_system_login_user.py --username "$5" --rate_limit "${11}" --rate_time "${13}" --window_size "${9}"</command>

+                                  </tagNode>

+                                </children>

+                              </tagNode>

+                            </children>

+                          </tagNode>

+                        </children>

+                      </node>

+                    </children>

+                  </node>

+                </children>

+              </tagNode>

+            </children>

+          </node>

+        </children>

+      </node>

+    </children>

+  </node>

+</interfaceDefinition>

diff --git a/src/op_mode/generate_system_login_user.py b/src/op_mode/generate_system_login_user.py
new file mode 100755
index 000000000..8f8827b1b
--- /dev/null
+++ b/src/op_mode/generate_system_login_user.py
@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+#
+# Copyright (C) 2022 VyOS maintainers and contributors
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 or later as
+# published by the Free Software Foundation.
+#
+# This program 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 General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import argparse
+import os
+
+from vyos.util import popen
+from secrets import token_hex
+from base64 import b32encode
+
+if os.geteuid() != 0:
+    exit("You need to have root privileges to run this script.\nPlease try again, this time using 'sudo'. Exiting.")
+
+if __name__ == '__main__':
+    parser = argparse.ArgumentParser()
+    parser.add_argument("-u", "--username", type=str, help='Username used for authentication', required=True)
+    parser.add_argument("-l", "--rate_limit", type=str, help='Limit number of logins (rate-limit) per rate-time (default: 3)',  default="3", required=False)
+    parser.add_argument("-t", "--rate_time", type=str, help='Limit number of logins (rate-limit) per rate-time (default: 30)', default="30", required=False)
+    parser.add_argument("-w", "--window_size", type=str, help='Set window of concurrently valid codes (default: 3)', default="3", required=False)
+    parser.add_argument("-i", "--interval", type=str, help='Duration of single time interval',  default="30", required=False)
+    parser.add_argument("-d", "--digits", type=str, help='The number of digits in the one-time password', default="6", required=False)
+    args = parser.parse_args()
+
+    hostname = os.uname()[1]
+    username = args.username
+    rate_limit = args.rate_limit
+    rate_time = args.rate_time
+    window_size = args.window_size
+    digits = args.digits
+    period = args.interval
+
+    # check variables:
+    if int(rate_limit) < 1 or int(rate_limit) > 10:
+        print("")
+        quit("Number of logins (rate-limit) must be between '1' and '10'")
+
+    if int(rate_time) < 15 or int(rate_time) > 600:
+        print("")
+        quit("The rate-time must be between '15' and '600' seconds")
+
+    if int(window_size) < 1 or int(window_size) > 21:
+        print("")
+        quit("Window of concurrently valid codes must be between '1' and '21' seconds")
+
+    # generate OTP key, URL & QR:
+    key_hex = token_hex(20)
+    key_base32 = b32encode(bytes.fromhex(key_hex)).decode()
+
+    otp_url=''.join(["otpauth://totp/",username,"@",hostname,"?secret=",key_base32,"&digits=",digits,"&period=",period])
+    qrcode,err = popen('qrencode -t ansiutf8', input=otp_url)
+
+    print("# You can share it with the user, he just needs to scan the QR in his OTP app")
+    print("# username: ", username)
+    print("# OTP KEY: ", key_base32)
+    print("# OTP URL: ", otp_url)
+    print(qrcode)
+    print('# To add this OTP key to configuration, run the following commands:')
+    print(f"set system login user {username} authentication otp key '{key_base32}'")
+    if rate_limit != "3":
+        print(f"set system login user {username} authentication otp rate-limit '{rate_limit}'")
+    if rate_time != "30":
+        print(f"set system login user {username} authentication otp rate-time '{rate_time}'")
+    if window_size != "3":
+        print(f"set system login user {username} authentication otp window-size '{window_size}'")