Mercurial > templog
annotate web/secure.py @ 224:01bbb8b93f77
title
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 29 Jan 2015 22:52:26 +0800 |
| parents | 59379b2bd056 |
| children | da769023bf08 |
| rev | line source |
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key fingerprints are case- and whitespace-insensitive.
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parents:
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1 import re |
| 185 | 2 import os |
| 3 import time | |
| 4 import fcntl | |
| 5 import hmac | |
| 6 import binascii | |
| 7 import sys | |
| 189 | 8 import hashlib |
| 9 | |
| 10 import bottle | |
| 185 | 11 |
| 12 import config | |
| 13 | |
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14 __all__ = ["get_csrf_blob", "check_csrf_blob", "setup_csrf", "get_user_hash", |
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15 "check_user_hash"] |
| 189 | 16 |
| 17 HASH=hashlib.sha1 | |
| 185 | 18 |
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19 CLEAN_RE = re.compile('[^a-z0-9A-Z]') |
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20 |
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21 def clean_hash(h): |
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22 return CLEAN_RE.sub('', h.lower()) |
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23 |
| 185 | 24 def get_user_hash(): |
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25 """ |
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26 Uses the following apache config. |
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27 Needs a separate port or IP to no-certificate SSL, SNI isn't good enough. |
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28 |
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29 <location /~matt/templog/set> |
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30 Require all granted |
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31 SSLVerifyClient optional_no_ca |
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32 SSLVerifyDepth 1 |
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33 SSLOptions +StdEnvVars +ExportCertData +OptRenegotiate |
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34 </location> |
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35 """ |
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36 |
| 191 | 37 verify = bottle.request.environ.get('SSL_CLIENT_VERIFY', '') |
| 38 if not (verify == 'GENEROUS' or verify == 'SUCCESS'): | |
| 189 | 39 return 'FAILVERIFY' |
| 40 blob = bottle.request.environ.get('SSL_CLIENT_CERT') | |
| 41 if not blob: | |
| 42 return 'NOCERT' | |
| 43 | |
| 44 b64 = ''.join(l for l in blob.split('\n') | |
| 45 if not l.startswith('-')) | |
| 46 | |
| 47 return HASH(binascii.a2b_base64(b64)).hexdigest() | |
| 185 | 48 |
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49 def check_user_hash(allowed_users): |
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50 current_hash = clean_hash(get_user_hash()) |
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51 for a in allowed_users: |
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52 if current_hash == clean_hash(a): |
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53 return True |
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54 return False |
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55 |
| 185 | 56 def setup_csrf(): |
| 57 NONCE_SIZE=16 | |
| 58 global _csrf_fd, _csrf_key | |
| 59 _csrf_fd = open('%s/csrf.dat' % config.DATA_PATH, 'r+') | |
| 60 | |
| 61 try: | |
| 62 fcntl.lockf(_csrf_fd, fcntl.LOCK_EX | fcntl.LOCK_NB) | |
| 63 os.fchmod(_csrf_fd.fileno(), 0600) | |
| 64 _csrf_fd.write("%d-%s" % (os.getpid(), binascii.hexlify(os.urandom(NONCE_SIZE)))) | |
| 65 _csrf_fd.flush() | |
| 66 _csrf_fd.seek(0) | |
| 67 except IOError: | |
| 68 pass | |
| 69 fcntl.lockf(_csrf_fd, fcntl.LOCK_SH) | |
| 70 _csrf_key = _csrf_fd.read() | |
| 71 # keep the lock open until we go away | |
| 72 | |
| 73 | |
| 74 def get_csrf_blob(): | |
| 75 expiry = int(config.CSRF_TIMEOUT + time.time()) | |
| 76 content = '%s-%s' % (get_user_hash(), expiry) | |
| 77 mac = hmac.new(_csrf_key, content).hexdigest() | |
| 78 return "%s-%s" % (content, mac) | |
| 79 | |
| 80 def check_csrf_blob(blob): | |
| 81 toks = blob.split('-') | |
| 82 if len(toks) != 3: | |
| 194 | 83 print>>sys.stderr, "wrong toks" |
| 185 | 84 return False |
| 85 | |
| 86 user, expiry, mac = toks | |
| 87 if user != get_user_hash(): | |
| 194 | 88 print>>sys.stderr, "wrong user" |
| 185 | 89 return False |
| 90 | |
| 91 try: | |
| 92 exp = int(expiry) | |
| 93 except ValueError: | |
| 194 | 94 print>>sys.stderr, "failed exp" |
| 185 | 95 return False |
| 96 | |
| 97 if exp < 1000000000: | |
| 98 return False | |
| 99 | |
| 194 | 100 if exp < time.time(): |
| 101 print>>sys.stderr, "expired %d %d" % (exp, time.time()) | |
| 185 | 102 return False |
| 103 | |
| 104 check_content = "%s-%s" % (user, expiry) | |
| 194 | 105 check_mac = hmac.new(_csrf_key, check_content).hexdigest() |
| 185 | 106 if mac == check_mac: |
| 194 | 107 print>>sys.stderr, "good hmac" |
| 185 | 108 return True |
| 109 | |
| 194 | 110 print>>sys.stderr, "fail" |
| 185 | 111 return False |
| 112 |