From 64034d4e269ad42ed8e76de02a6fd67571be1044 Mon Sep 17 00:00:00 2001
From: Jason Heard <jasonpheard@gmail.com>
Date: Sun, 15 Nov 2015 15:34:26 -0700
Subject: Add file-based challenge hosting

---
 sign_csr.py | 57 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 40 insertions(+), 17 deletions(-)

diff --git a/sign_csr.py b/sign_csr.py
index 815c4ea..ff9332b 100644
--- a/sign_csr.py
+++ b/sign_csr.py
@@ -2,7 +2,43 @@
 import argparse, subprocess, json, os, urllib2, sys, base64, binascii, time, \
     hashlib, tempfile, re, copy, textwrap
 
-def sign_csr(pubkey, csr, email=None):
+
+def host_token(domain, token, response_payload, user_step_number, file_based):
+    if file_based:
+        response_url = 'http://{}.well-known/acme-challenge/{}'.format(domain, token)
+
+        # tell the user where to put a file
+        sys.stderr.write("""\
+STEP {}: You need to place a file on your webserver so that the URL {} will
+resolve to a file with the contents:
+
+--------------
+{}
+--------------
+
+""".format(user_step_number, response_url, response_payload))
+    else:
+        sys.stderr.write("""\
+STEP {}: You need to run this command on {} (don't stop the python command until the next step).
+
+openssl req -new -x509 -keyout server.pem -out server.pem -days 365 -nodes
+sudo python -c "import BaseHTTPServer; \\
+    import ssl; \\
+    h = BaseHTTPServer.BaseHTTPRequestHandler; \\
+    h.do_GET = lambda r: r.send_response(200) or r.end_headers() or r.wfile.write('{}'); \\
+    s = BaseHTTPServer.HTTPServer(('0.0.0.0', 443), h); \\
+    s.socket = ssl.wrap_socket(s.socket, certfile='server.pem', server_side=True); \\
+    s.serve_forever()"
+
+""".format(user_step_number, domain, response_payload.replace('"', '\\"')))
+
+    stdout = sys.stdout
+    sys.stdout = sys.stderr
+    raw_input("Press Enter when you've got the python command running on your server...")
+    sys.stdout = stdout
+
+
+def sign_csr(pubkey, csr, email=None, file_based=False):
     """Use the ACME protocol to get an ssl certificate signed by a
     certificate authority.
 
@@ -287,21 +323,7 @@ STEP 3: You need to sign some more files (replace 'user.key' with your user priv
 
     # Step 11: Ask the user to host the token on their server
     for n, i in enumerate(ids):
-        sys.stderr.write("""\
-STEP {}: You need to run this command on {} (don't stop the python command until the next step).
-
-sudo python -c "import BaseHTTPServer; \\
-    h = BaseHTTPServer.BaseHTTPRequestHandler; \\
-    h.do_GET = lambda r: r.send_response(200) or r.end_headers() or r.wfile.write('{}'); \\
-    s = BaseHTTPServer.HTTPServer(('0.0.0.0', 80), h); \\
-    s.serve_forever()"
-
-""".format(n+4, i['domain'], responses[n]['data']))
-
-        stdout = sys.stdout
-        sys.stdout = sys.stderr
-        raw_input("Press Enter when you've got the python command running on your server...")
-        sys.stdout = stdout
+        host_token(i['domain'], challenge['token'], responses[n]['data'], n + 4, file_based)
 
         # Step 12: Let the CA know you're ready for the challenge
         sys.stderr.write("Requesting verification for {}...\n".format(i['domain']))
@@ -409,9 +431,10 @@ $ python sign_csr.py --public-key user.pub domain.csr > signed.crt
 """)
     parser.add_argument("-p", "--public-key", required=True, help="path to your account public key")
     parser.add_argument("-e", "--email", default=None, help="contact email, default is webmaster@<shortest_domain>")
+    parser.add_argument("-f", "--file-based", action='store_true', help="if set, a file-based response is used")
     parser.add_argument("csr_path", help="path to your certificate signing request")
 
     args = parser.parse_args()
-    signed_crt = sign_csr(args.public_key, args.csr_path, email=args.email)
+    signed_crt = sign_csr(args.public_key, args.csr_path, email=args.email, file_based=args.file_based)
     sys.stdout.write(signed_crt)
 
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