From 90bd73177964246a0e1a5d6c5e4255dcc8ec700d Mon Sep 17 00:00:00 2001
From: Magnus Ahltorp <map@kth.se>
Date: Fri, 27 Feb 2015 13:53:32 +0100
Subject: Require authentication for merge calls

---
 tools/merge.py | 42 ++++++++++++++++++++++++++++++++----------
 1 file changed, 32 insertions(+), 10 deletions(-)

(limited to 'tools/merge.py')

diff --git a/tools/merge.py b/tools/merge.py
index f4a007d..6becf7e 100755
--- a/tools/merge.py
+++ b/tools/merge.py
@@ -11,6 +11,9 @@ import urllib
 import urllib2
 import sys
 import time
+import ecdsa
+import hashlib
+import urlparse
 from certtools import build_merkle_tree, create_sth_signature, check_sth_signature, get_eckey_from_file, timing_point
 
 parser = argparse.ArgumentParser(description="")
@@ -19,6 +22,8 @@ parser.add_argument("--frontend", action="append", metavar="url", help="Base URL
 parser.add_argument("--storage", action="append", metavar="url", help="Base URL for storage server", required=True)
 parser.add_argument("--mergedb", metavar="dir", help="Merge database directory", required=True)
 parser.add_argument("--keyfile", metavar="keyfile", help="File containing log key", required=True)
+parser.add_argument("--own-keyname", metavar="keyname", help="The key name of the merge node", required=True)
+parser.add_argument("--own-keyfile", metavar="keyfile", help="The file containing the private key of the merge node", required=True)
 parser.add_argument("--nomerge", action='store_true', help="Don't actually do merge")
 args = parser.parse_args()
 
@@ -52,9 +57,26 @@ def add_to_logorder(key):
     f.write(base64.b16encode(key) + "\n")
     f.close()
 
+def http_request(url, data=None):
+    req = urllib2.Request(url, data)
+    keyname = args.own_keyname
+    privatekey = get_eckey_from_file(args.own_keyfile)
+    sk = ecdsa.SigningKey.from_der(privatekey)
+    parsed_url = urlparse.urlparse(url)
+    if data == None:
+        data = parsed_url.query
+        method = "GET"
+    else:
+        method = "POST"
+    signature = sk.sign("%s\0%s\0%s" % (method, parsed_url.path, data), hashfunc=hashlib.sha256,
+                        sigencode=ecdsa.util.sigencode_der)
+    req.add_header('X-Catlfish-Auth', base64.b64encode(signature) + ";key=" + keyname)
+    result = urllib2.urlopen(req).read()
+    return result
+
 def get_new_entries(baseurl):
     try:
-        result = urllib2.urlopen(baseurl + "ct/storage/fetchnewentries").read()
+        result = http_request(baseurl + "ct/storage/fetchnewentries")
         parsed_result = json.loads(result)
         if parsed_result.get(u"result") == u"ok":
             return [base64.b64decode(entry) for entry in parsed_result[u"entries"]]
@@ -67,7 +89,7 @@ def get_new_entries(baseurl):
 def get_entries(baseurl, hashes):
     try:
         params = urllib.urlencode({"hash":[base64.b64encode(hash) for hash in hashes]}, doseq=True)
-        result = urllib2.urlopen(baseurl + "ct/storage/getentry?" + params).read()
+        result = http_request(baseurl + "ct/storage/getentry?" + params)
         parsed_result = json.loads(result)
         if parsed_result.get(u"result") == u"ok":
             entries = dict([(base64.b64decode(entry["hash"]), base64.b64decode(entry["entry"])) for entry in parsed_result[u"entries"]])
@@ -82,7 +104,7 @@ def get_entries(baseurl, hashes):
 
 def get_curpos(baseurl):
     try:
-        result = urllib2.urlopen(baseurl + "ct/frontend/currentposition").read()
+        result = http_request(baseurl + "ct/frontend/currentposition")
         parsed_result = json.loads(result)
         if parsed_result.get(u"result") == u"ok":
             return parsed_result[u"position"]
@@ -94,8 +116,8 @@ def get_curpos(baseurl):
 
 def sendlog(baseurl, submission):
     try:
-        result = urllib2.urlopen(baseurl + "ct/frontend/sendlog",
-            json.dumps(submission)).read()
+        result = http_request(baseurl + "ct/frontend/sendlog",
+            json.dumps(submission))
         return json.loads(result)
     except urllib2.HTTPError, e:
         print "ERROR: sendlog", e.read()
@@ -110,8 +132,8 @@ def sendlog(baseurl, submission):
 
 def sendentry(baseurl, entry, hash):
     try:
-        result = urllib2.urlopen(baseurl + "ct/frontend/sendentry",
-            json.dumps({"entry":base64.b64encode(entry), "treeleafhash":base64.b64encode(hash)})).read()
+        result = http_request(baseurl + "ct/frontend/sendentry",
+            json.dumps({"entry":base64.b64encode(entry), "treeleafhash":base64.b64encode(hash)}))
         return json.loads(result)
     except urllib2.HTTPError, e:
         print "ERROR: sendentry", e.read()
@@ -126,8 +148,8 @@ def sendentry(baseurl, entry, hash):
 
 def sendsth(baseurl, submission):
     try:
-        result = urllib2.urlopen(baseurl + "ct/frontend/sendsth",
-            json.dumps(submission)).read()
+        result = http_request(baseurl + "ct/frontend/sendsth",
+            json.dumps(submission))
         return json.loads(result)
     except urllib2.HTTPError, e:
         print "ERROR: sendsth", e.read()
@@ -142,7 +164,7 @@ def sendsth(baseurl, submission):
 
 def get_missingentries(baseurl):
     try:
-        result = urllib2.urlopen(baseurl + "ct/frontend/missingentries").read()
+        result = http_request(baseurl + "ct/frontend/missingentries")
         parsed_result = json.loads(result)
         if parsed_result.get(u"result") == u"ok":
             return parsed_result[u"entries"]
-- 
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