acmecert: Removed obsolete saved code.
[utils.git] / acmecert
1 #!/usr/bin/python3
2
3 import sys, os, getopt, binascii, json, pprint, signal, time, threading
4 import urllib.request
5 import Crypto.PublicKey.RSA, Crypto.Random, Crypto.Hash.SHA256, Crypto.Signature.PKCS1_v1_5
6
7 class msgerror(Exception):
8     def report(self, out):
9         out.write("acmecert: undefined error\n")
10
11 service = "https://acme-v02.api.letsencrypt.org/directory"
12 _directory = None
13 def directory():
14     global _directory
15     if _directory is None:
16         with req(service) as resp:
17             _directory = json.loads(resp.read().decode("utf-8"))
18     return _directory
19
20 def base64url(dat):
21     return binascii.b2a_base64(dat).decode("us-ascii").translate({43: 45, 47: 95, 61: None}).strip()
22
23 def ebignum(num):
24     h = "%x" % num
25     if len(h) % 2 == 1: h = "0" + h
26     return base64url(binascii.a2b_hex(h))
27
28 def getnonce():
29     with urllib.request.urlopen(directory()["newNonce"]) as resp:
30         resp.read()
31         return resp.headers["Replay-Nonce"]
32
33 def req(url, data=None, ctype=None, headers={}, method=None, **kws):
34     if data is not None and not isinstance(data, bytes):
35         data = json.dumps(data).encode("utf-8")
36         ctype = "application/jose+json"
37     req = urllib.request.Request(url, data=data, method=method)
38     for hnam, hval in headers.items():
39         req.add_header(hnam, hval)
40     if ctype is not None:
41         req.add_header("Content-Type", ctype)
42     return urllib.request.urlopen(req)
43
44 def jreq(url, data, auth):
45     authdata = {"alg": "RS256", "url": url, "nonce": getnonce()}
46     authdata.update(auth.authdata())
47     authdata = base64url(json.dumps(authdata).encode("us-ascii"))
48     if data is None:
49         data = ""
50     else:
51         data = base64url(json.dumps(data).encode("us-ascii"))
52     seal = base64url(auth.sign(("%s.%s" % (authdata, data)).encode("us-ascii")))
53     enc = {"protected": authdata, "payload": data, "signature": seal}
54     with req(url, data=enc) as resp:
55         return json.loads(resp.read().decode("utf-8")), resp.headers
56
57 class certificate(object):
58     @property
59     def enddate(self):
60         # No X509 parser for Python?
61         import subprocess, re, calendar
62         with subprocess.Popen(["openssl", "x509", "-noout", "-enddate"], stdin=subprocess.PIPE, stdout=subprocess.PIPE) as openssl:
63             openssl.stdin.write(self.data.encode("us-ascii"))
64             openssl.stdin.close()
65             resp = openssl.stdout.read().decode("utf-8")
66             if openssl.wait() != 0:
67                 raise Exception("openssl error")
68         m = re.search(r"notAfter=(.*)$", resp)
69         if m is None: raise Exception("unexpected openssl reply: %r" % (resp,))
70         return calendar.timegm(time.strptime(m.group(1), "%b %d %H:%M:%S %Y GMT"))
71
72     def expiring(self, timespec):
73         if timespec.endswith("y"):
74             timespec = int(timespec[:-1]) * 365 * 86400
75         elif timespec.endswith("m"):
76             timespec = int(timespec[:-1]) * 30 * 86400
77         elif timespec.endswith("w"):
78             timespec = int(timespec[:-1]) * 7 * 86400
79         elif timespec.endswith("d"):
80             timespec = int(timespec[:-1]) * 86400
81         elif timespec.endswith("h"):
82             timespec = int(timespec[:-1]) * 3600
83         else:
84             timespec = int(timespec)
85         return (self.enddate - time.time()) < timespec
86
87     @classmethod
88     def read(cls, fp):
89         self = cls()
90         self.data = fp.read()
91         return self
92
93 class signreq(object):
94     def domains(self):
95         # No PCKS10 parser for Python?
96         import subprocess, re
97         with subprocess.Popen(["openssl", "req", "-noout", "-text"], stdin=subprocess.PIPE, stdout=subprocess.PIPE) as openssl:
98             openssl.stdin.write(self.data.encode("us-ascii"))
99             openssl.stdin.close()
100             resp = openssl.stdout.read().decode("utf-8")
101             if openssl.wait() != 0:
102                 raise Exception("openssl error")
103         m = re.search(r"X509v3 Subject Alternative Name:[^\n]*\n\s*((\w+:\S+,\s*)*\w+:\S+)\s*\n", resp)
104         if m is None:
105             return []
106         ret = []
107         for nm in m.group(1).split(","):
108             nm = nm.strip()
109             typ, nm = nm.split(":", 1)
110             if typ == "DNS":
111                 ret.append(nm)
112         return ret
113
114     def der(self):
115         import subprocess
116         with subprocess.Popen(["openssl", "req", "-outform", "der"], stdin=subprocess.PIPE, stdout=subprocess.PIPE) as openssl:
117             openssl.stdin.write(self.data.encode("us-ascii"))
118             openssl.stdin.close()
119             resp = openssl.stdout.read()
120             if openssl.wait() != 0:
121                 raise Exception("openssl error")
122         return resp
123
124     @classmethod
125     def read(cls, fp):
126         self = cls()
127         self.data = fp.read()
128         return self
129
130 class jwkauth(object):
131     def __init__(self, key):
132         self.key = key
133
134     def authdata(self):
135         return {"jwk": {"kty": "RSA", "e": ebignum(self.key.e), "n": ebignum(self.key.n)}}
136
137     def sign(self, data):
138         dig = Crypto.Hash.SHA256.new()
139         dig.update(data)
140         return Crypto.Signature.PKCS1_v1_5.new(self.key).sign(dig)
141
142 class account(object):
143     def __init__(self, uri, key):
144         self.uri = uri
145         self.key = key
146
147     def authdata(self):
148         return {"kid": self.uri}
149
150     def sign(self, data):
151         dig = Crypto.Hash.SHA256.new()
152         dig.update(data)
153         return Crypto.Signature.PKCS1_v1_5.new(self.key).sign(dig)
154
155     def getinfo(self):
156         data, headers = jreq(self.uri, None, self)
157         return data
158
159     def validate(self):
160         data = self.getinfo()
161         if data.get("status", "") != "valid":
162             raise Exception("account is not valid: %s" % (data.get("status", "\"\"")))
163
164     def write(self, out):
165         out.write("%s\n" % (self.uri,))
166         out.write("%s\n" % (self.key.exportKey().decode("us-ascii"),))
167
168     @classmethod
169     def read(cls, fp):
170         uri = fp.readline()
171         if uri == "":
172             raise Exception("missing account URI")
173         uri = uri.strip()
174         key = Crypto.PublicKey.RSA.importKey(fp.read())
175         return cls(uri, key)
176
177 class htconfig(object):
178     def __init__(self):
179         self.roots = {}
180
181     @classmethod
182     def read(cls, fp):
183         self = cls()
184         for ln in fp:
185             words = ln.split()
186             if len(words) < 1 or ln[0] == '#':
187                 continue
188             if words[0] == "root":
189                 self.roots[words[1]] = words[2]
190             else:
191                 sys.stderr.write("acmecert: warning: unknown htconfig directive: %s\n" % (words[0]))
192         return self
193
194 def register(keysize=4096):
195     key = Crypto.PublicKey.RSA.generate(keysize, Crypto.Random.new().read)
196     data, headers = jreq(directory()["newAccount"], {"termsOfServiceAgreed": True}, jwkauth(key))
197     return account(headers["Location"], key)
198     
199 def mkorder(acct, csr):
200     data, headers = jreq(directory()["newOrder"], {"identifiers": [{"type": "dns", "value": dn} for dn in csr.domains()]}, acct)
201     data["acmecert.location"] = headers["Location"]
202     return data
203
204 def httptoken(acct, ch):
205     jwk = {"kty": "RSA", "e": ebignum(acct.key.e), "n": ebignum(acct.key.n)}
206     dig = Crypto.Hash.SHA256.new()
207     dig.update(json.dumps(jwk, separators=(',', ':'), sort_keys=True).encode("us-ascii"))
208     khash = base64url(dig.digest())
209     return ch["token"], ("%s.%s" % (ch["token"], khash))
210
211 def authorder(acct, htconf, orderid):
212     order, headers = jreq(orderid, None, acct)
213     valid = False
214     tries = 0
215     while not valid:
216         valid = True
217         tries += 1
218         if tries > 5:
219             raise Exception("challenges refuse to become valid even after 5 retries")
220         for authuri in order["authorizations"]:
221             auth, headers = jreq(authuri, None, acct)
222             if auth["status"] == "valid":
223                 continue
224             elif auth["status"] == "pending":
225                 pass
226             else:
227                 raise Exception("unknown authorization status: %s" % (auth["status"],))
228             valid = False
229             if auth["identifier"]["type"] != "dns":
230                 raise Exception("unknown authorization type: %s" % (auth["identifier"]["type"],))
231             dn = auth["identifier"]["value"]
232             if dn not in htconf.roots:
233                 raise Exception("no configured ht-root for domain name %s" % (dn,))
234             for ch in auth["challenges"]:
235                 if ch["type"] == "http-01":
236                     break
237             else:
238                 raise Exception("no http-01 challenge for %s" % (dn,))
239             root = htconf.roots[dn]
240             tokid, tokval = httptoken(acct, ch)
241             tokpath = os.path.join(root, tokid);
242             fp = open(tokpath, "w")
243             try:
244                 with fp:
245                     fp.write(tokval)
246                 with req("http://%s/.well-known/acme-challenge/%s" % (dn, tokid)) as resp:
247                     if resp.read().decode("utf-8") != tokval:
248                         raise Exception("challenge from %s does not match written value" % (dn,))
249                 for n in range(30):
250                     resp, headers = jreq(ch["url"], {}, acct)
251                     if resp["status"] == "processing":
252                         time.sleep(2)
253                     elif resp["status"] == "pending":
254                         # I don't think this should happen, but it
255                         # does. LE bug? Anyway, just retry.
256                         if n < 5:
257                             time.sleep(2)
258                         else:
259                             break
260                     elif resp["status"] == "valid":
261                         break
262                     else:
263                         raise Exception("unexpected challenge status for %s when validating: %s" % (dn, resp["status"]))
264                 else:
265                     raise Exception("challenge processing timed out for %s" % (dn,))
266             finally:
267                 os.unlink(tokpath)
268
269 def finalize(acct, csr, orderid):
270     order, headers = jreq(orderid, None, acct)
271     if order["status"] == "valid":
272         pass
273     elif order["status"] == "ready":
274         jreq(order["finalize"], {"csr": base64url(csr.der())}, acct)
275         for n in range(30):
276             resp, headers = jreq(orderid, None, acct)
277             if resp["status"] == "processing":
278                 time.sleep(2)
279             elif resp["status"] == "valid":
280                 order = resp
281                 break
282             else:
283                 raise Exception("unexpected order status when finalizing: %s" % resp["status"])
284         else:
285             raise Exception("order finalization timed out")
286     else:
287         raise Exception("unexpected order state when finalizing: %s" % (order["status"],))
288     with req(order["certificate"]) as resp:
289         return resp.read().decode("us-ascii")
290
291 class maybeopen(object):
292     def __init__(self, name, mode):
293         if name == "-":
294             self.opened = False
295             if mode == "r":
296                 self.fp = sys.stdin
297             elif mode == "w":
298                 self.fp = sys.stdout
299             else:
300                 raise ValueError(mode)
301         else:
302             self.opened = True
303             self.fp = open(name, mode)
304
305     def __enter__(self):
306         return self.fp
307
308     def __exit__(self, *excinfo):
309         if self.opened:
310             self.fp.close()
311         return False
312
313 invdata = threading.local()
314 commands = {}
315
316 class usageerr(msgerror):
317     def __init__(self):
318         self.cmd = invdata.cmd
319
320     def report(self, out):
321         out.write("%s\n" % (self.cmd.__doc__,))
322
323 def cmd_reg(args):
324     "usage: acmecert reg [OUTPUT-FILE]"
325     acct = register()
326     os.umask(0o077)
327     with maybeopen(args[1] if len(args) > 1 else "-", "w") as fp:
328         acct.write(fp)
329 commands["reg"] = cmd_reg
330
331 def cmd_validate_acct(args):
332     "usage: acmecert validate-acct ACCOUNT-FILE"
333     if len(args) < 2: raise usageerr()
334     with maybeopen(args[1], "r") as fp:
335         account.read(fp).validate()
336 commands["validate-acct"] = cmd_validate_acct
337
338 def cmd_acct_info(args):
339     "usage: acmecert acct-info ACCOUNT-FILE"
340     if len(args) < 2: raise usageerr()
341     with maybeopen(args[1], "r") as fp:
342         pprint.pprint(account.read(fp).getinfo())
343 commands["acct-info"] = cmd_acct_info
344
345 def cmd_order(args):
346     "usage: acmecert order ACCOUNT-FILE CSR [OUTPUT-FILE]"
347     if len(args) < 3: raise usageerr()
348     with maybeopen(args[1], "r") as fp:
349         acct = account.read(fp)
350     with maybeopen(args[2], "r") as fp:
351         csr = signreq.read(fp)
352     order = mkorder(acct, csr)
353     with maybeopen(args[3] if len(args) > 3 else "-", "w") as fp:
354         fp.write("%s\n" % (order["acmecert.location"]))
355 commands["order"] = cmd_order
356
357 def cmd_http_auth(args):
358     "usage: acmecert http-auth ACCOUNT-FILE HTTP-CONFIG {ORDER-ID|ORDER-FILE}"
359     if len(args) < 4: raise usageerr()
360     with maybeopen(args[1], "r") as fp:
361         acct = account.read(fp)
362     with maybeopen(args[2], "r") as fp:
363         htconf = htconfig.read(fp)
364     if "://" in args[3]:
365         orderid = args[3]
366     else:
367         with maybeopen(args[3], "r") as fp:
368             orderid = fp.readline().strip()
369     authorder(acct, htconf, orderid)
370 commands["http-auth"] = cmd_http_auth
371
372 def cmd_get(args):
373     "usage: acmecert get ACCOUNT-FILE CSR {ORDER-ID|ORDER-FILE}"
374     if len(args) < 4: raise usageerr()
375     with maybeopen(args[1], "r") as fp:
376         acct = account.read(fp)
377     with maybeopen(args[2], "r") as fp:
378         csr = signreq.read(fp)
379     if "://" in args[3]:
380         orderid = args[3]
381     else:
382         with maybeopen(args[3], "r") as fp:
383             orderid = fp.readline().strip()
384     sys.stdout.write(finalize(acct, csr, orderid))
385 commands["get"] = cmd_get
386
387 def cmd_http_order(args):
388     "usage: acmecert http-order ACCOUNT-FILE CSR HTTP-CONFIG [OUTPUT-FILE]"
389     if len(args) < 4: raise usageerr()
390     with maybeopen(args[1], "r") as fp:
391         acct = account.read(fp)
392     with maybeopen(args[2], "r") as fp:
393         csr = signreq.read(fp)
394     with maybeopen(args[3], "r") as fp:
395         htconf = htconfig.read(fp)
396     orderid = mkorder(acct, csr)["acmecert.location"]
397     authorder(acct, htconf, orderid)
398     with maybeopen(args[4] if len(args) > 4 else "-", "w") as fp:
399         fp.write(finalize(acct, csr, orderid))
400 commands["http-order"] = cmd_http_order
401
402 def cmd_check_cert(args):
403     "usage: acmecert check-cert CERT-FILE TIME-SPEC"
404     if len(args) < 3: raise usageerr()
405     with maybeopen(args[1], "r") as fp:
406         crt = certificate.read(fp)
407     sys.exit(1 if crt.expiring(args[2]) else 0)
408 commands["check-cert"] = cmd_check_cert
409
410 def cmd_directory(args):
411     "usage: acmecert directory"
412     pprint.pprint(directory())
413 commands["directory"] = cmd_directory
414
415 def usage(out):
416     out.write("usage: acmecert [-D SERVICE] COMMAND [ARGS...]\n")
417     out.write("       acmecert -h [COMMAND]\n")
418     buf =     "       COMMAND is any of: "
419     f = True
420     for cmd in commands:
421         if len(buf) + len(cmd) > 70:
422             out.write("%s\n" % (buf,))
423             buf =     "           "
424             f = True
425         if not f:
426             buf += ", "
427         buf += cmd
428         f = False
429     if not f:
430         out.write("%s\n" % (buf,))
431
432 def main(argv):
433     global service
434     opts, args = getopt.getopt(argv[1:], "hD:")
435     for o, a in opts:
436         if o == "-h":
437             if len(args) > 0:
438                 cmd = commands.get(args[0])
439                 if cmd is None:
440                     sys.stderr.write("acmecert: unknown command: %s\n" % (args[0],))
441                     sys.exit(1)
442                 sys.stdout.write("%s\n" % (cmd.__doc__,))
443             else:
444                 usage(sys.stdout)
445             sys.exit(0)
446         elif o == "-D":
447             service = a
448     if len(args) < 1:
449         usage(sys.stderr)
450         sys.exit(1)
451     cmd = commands.get(args[0])
452     if cmd is None:
453         sys.stderr.write("acmecert: unknown command: %s\n" % (args[0],))
454         usage(sys.stderr)
455         sys.exit(1)
456     try:
457         try:
458             invdata.cmd = cmd
459             cmd(args)
460         finally:
461             invdata.cmd = None
462     except msgerror as exc:
463         exc.report(sys.stderr)
464         sys.exit(1)
465
466 if __name__ == "__main__":
467     try:
468         main(sys.argv)
469     except KeyboardInterrupt:
470         signal.signal(signal.SIGINT, signal.SIG_DFL)
471         os.kill(os.getpid(), signal.SIGINT)