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1 | #! @PYTHON@ |
2 | # -*-python-*- |
3 | |
4 | ### External dependencies |
5 | |
6 | import catacomb as C |
7 | import os as OS |
8 | import sys as SYS |
9 | import sre as RX |
10 | import getopt as O |
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11 | import shutil as SH |
12 | import filecmp as FC |
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13 | from cStringIO import StringIO |
14 | from errno import * |
15 | from stat import * |
16 | |
17 | ### Useful regular expressions |
18 | |
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19 | rx_comment = RX.compile(r'^\s*(#|$)') |
20 | rx_keyval = RX.compile(r'^\s*([-\w]+)(?:\s+(?!=)|\s*=\s*)(|\S|\S.*\S)\s*$') |
21 | rx_dollarsubst = RX.compile(r'\$\{([-\w]+)\}') |
22 | rx_atsubst = RX.compile(r'@([-\w]+)@') |
23 | rx_nonalpha = RX.compile(r'\W') |
24 | rx_seq = RX.compile(r'\<SEQ\>') |
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25 | |
26 | ### Utility functions |
27 | |
28 | class SubprocessError (Exception): pass |
29 | class VerifyError (Exception): pass |
30 | |
31 | quis = OS.path.basename(SYS.argv[0]) |
32 | PACKAGE = "@PACKAGE@" |
33 | VERSION = "@VERSION@" |
34 | |
35 | def moan(msg): |
36 | SYS.stderr.write('%s: %s\n' % (quis, msg)) |
37 | |
38 | def die(msg, rc = 1): |
39 | moan(msg) |
40 | SYS.exit(rc) |
41 | |
42 | def subst(s, rx, map): |
43 | out = StringIO() |
44 | i = 0 |
45 | for m in rx.finditer(s): |
46 | out.write(s[i:m.start()] + map[m.group(1)]) |
47 | i = m.end() |
48 | out.write(s[i:]) |
49 | return out.getvalue() |
50 | |
51 | def rmtree(path): |
52 | try: |
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53 | st = OS.lstat(path) |
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54 | except OSError, err: |
55 | if err.errno == ENOENT: |
56 | return |
57 | raise |
58 | if not S_ISDIR(st.st_mode): |
59 | OS.unlink(path) |
60 | else: |
61 | cwd = OS.getcwd() |
62 | try: |
63 | OS.chdir(path) |
64 | for i in OS.listdir('.'): |
65 | rmtree(i) |
66 | finally: |
67 | OS.chdir(cwd) |
68 | OS.rmdir(path) |
69 | |
70 | def zap(file): |
71 | try: |
72 | OS.unlink(file) |
73 | except OSError, err: |
74 | if err.errno == ENOENT: return |
75 | raise |
76 | |
77 | def run(args): |
78 | args = map(conf_subst, args.split()) |
79 | nargs = [] |
80 | for a in args: |
81 | if len(a) > 0 and a[0] != '!': |
82 | nargs += [a] |
83 | else: |
84 | nargs += a[1:].split() |
85 | args = nargs |
86 | print '+ %s' % ' '.join(args) |
87 | rc = OS.spawnvp(OS.P_WAIT, args[0], args) |
88 | if rc != 0: |
89 | raise SubprocessError, rc |
90 | |
91 | def hexhyphens(bytes): |
92 | out = StringIO() |
93 | for i in xrange(0, len(bytes)): |
94 | if i > 0 and i % 4 == 0: out.write('-') |
95 | out.write('%02x' % ord(bytes[i])) |
96 | return out.getvalue() |
97 | |
98 | def fingerprint(kf, ktag): |
99 | h = C.gchashes[conf['fingerprint-hash']]() |
100 | k = C.KeyFile(kf)[ktag].fingerprint(h, '-secret') |
101 | return h.done() |
102 | |
103 | ### Read configuration |
104 | |
105 | class ConfigFileError (Exception): pass |
106 | conf = {} |
107 | |
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108 | def conf_subst(s): return subst(s, rx_dollarsubst, conf) |
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109 | |
110 | ## Read the file |
111 | def conf_read(f): |
112 | lno = 0 |
113 | for line in file(f): |
114 | lno += 1 |
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115 | if rx_comment.match(line): continue |
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116 | if line[-1] == '\n': line = line[:-1] |
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117 | match = rx_keyval.match(line) |
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118 | if not match: |
119 | raise ConfigFileError, "%s:%d: bad line `%s'" % (f, lno, line) |
120 | k, v = match.groups() |
121 | conf[k] = conf_subst(v) |
122 | |
123 | ## Sift the wreckage |
124 | def conf_defaults(): |
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125 | for k, v in [('repos-base', 'tripe-keys.tar.gz'), |
126 | ('sig-base', 'tripe-keys.sig-<SEQ>'), |
127 | ('repos-url', '${base-url}${repos-base}'), |
128 | ('sig-url', '${base-url}${sig-base}'), |
129 | ('sig-file', '${base-dir}${sig-base}'), |
130 | ('repos-file', '${base-dir}${repos-base}'), |
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131 | ('conf-file', '${base-dir}tripe-keys.conf'), |
132 | ('kx', 'dh'), |
133 | ('kx-param', lambda: {'dh': '-LS -b2048 -B256', |
134 | 'ec': '-Cnist-p256'}[conf['kx']]), |
135 | ('kx-expire', 'now + 1 year'), |
136 | ('cipher', 'blowfish-cbc'), |
137 | ('hash', 'sha256'), |
138 | ('mgf', '${hash}-mgf'), |
139 | ('mac', lambda: '%s-hmac/%d' % |
140 | (conf['hash'], |
141 | C.gchashes[conf['hash']].hashsz * 4)), |
142 | ('sig', lambda: {'dh': 'dsa', 'ec': 'ecdsa'}[conf['kx']]), |
143 | ('sig-fresh', 'always'), |
144 | ('sig-genalg', lambda: {'kcdsa': 'dh', |
145 | 'dsa': 'dsa', |
146 | 'rsapkcs1': 'rsa', |
147 | 'rsapss': 'rsa', |
148 | 'ecdsa': 'ec', |
149 | 'eckcdsa': 'ec'}[conf['sig']]), |
150 | ('sig-param', lambda: {'dh': '-LS -b2048 -B256', |
151 | 'dsa': '-b2048 -B256', |
152 | 'ec': '-Cnist-p256', |
153 | 'rsa': '-b2048'}[conf['sig-genalg']]), |
154 | ('sig-hash', '${hash}'), |
155 | ('sig-expire', 'forever'), |
156 | ('fingerprint-hash', '${hash}')]: |
157 | try: |
158 | if k in conf: continue |
159 | if type(v) == str: |
160 | conf[k] = conf_subst(v) |
161 | else: |
162 | conf[k] = v() |
163 | except KeyError, exc: |
164 | if len(exc.args) == 0: raise |
165 | conf[k] = '<missing-var %s>' % exc.args[0] |
166 | |
167 | ### Commands |
168 | |
169 | def version(fp = SYS.stdout): |
170 | fp.write('%s, %s version %s\n' % (quis, PACKAGE, VERSION)) |
171 | |
172 | def usage(fp): |
173 | fp.write('Usage: %s SUBCOMMAND [ARGS...]\n' % quis) |
174 | |
175 | def cmd_help(args): |
176 | if len(args) == 0: |
177 | version(SYS.stdout) |
178 | print |
179 | usage(SYS.stdout) |
180 | print """ |
181 | Key management utility for TrIPE. |
182 | |
183 | Options supported: |
184 | |
185 | -h, --help Show this help message. |
186 | -v, --version Show the version number. |
187 | -u, --usage Show pointlessly short usage string. |
188 | |
189 | Subcommands available: |
190 | """ |
191 | args = commands.keys() |
192 | args.sort() |
193 | for c in args: |
194 | func, min, max, help = commands[c] |
195 | print '%s %s' % (c, help) |
196 | |
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197 | def master_keys(): |
198 | if not OS.path.exists('master'): |
199 | return |
200 | for k in C.KeyFile('master'): |
201 | if (k.type != 'tripe-keys-master' or |
202 | k.expiredp or |
203 | not k.tag.startswith('master-')): |
204 | continue #?? |
205 | yield k |
206 | def master_sequence(k): |
207 | return int(k.tag[7:]) |
208 | def max_master_sequence(): |
209 | seq = -1 |
210 | for k in master_keys(): |
211 | q = master_sequence(k) |
212 | if q > seq: seq = q |
213 | return seq |
214 | def seqsubst(x, q): |
215 | return rx_seq.sub(str(q), conf[x]) |
216 | |
217 | def cmd_newmaster(args): |
218 | seq = max_master_sequence() + 1 |
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219 | run('''key -kmaster add |
220 | -a${sig-genalg} !${sig-param} |
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221 | -e${sig-expire} -l -tmaster-%d tripe-keys-master |
222 | sig=${sig} hash=${sig-hash}''' % seq) |
223 | run('key -kmaster extract -f-secret repos/master.pub') |
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224 | |
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225 | def cmd_setup(args): |
226 | OS.mkdir('repos') |
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227 | run('''key -krepos/param add |
228 | -a${kx}-param !${kx-param} |
229 | -eforever -tparam tripe-${kx}-param |
230 | cipher=${cipher} hash=${hash} mac=${mac} mgf=${mgf}''') |
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231 | cmd_newmaster(args) |
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232 | |
233 | def cmd_upload(args): |
234 | |
235 | ## Sanitize the repository directory |
236 | umask = OS.umask(0); OS.umask(umask) |
237 | mode = 0666 & ~umask |
238 | for f in OS.listdir('repos'): |
239 | ff = OS.path.join('repos', f) |
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240 | if (f.startswith('master') or f.startswith('peer-')) \ |
241 | and f.endswith('.old'): |
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242 | OS.unlink(ff) |
243 | continue |
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244 | OS.chmod(ff, mode) |
245 | |
246 | rmtree('tmp') |
247 | OS.mkdir('tmp') |
248 | OS.symlink('../repos', 'tmp/repos') |
249 | cwd = OS.getcwd() |
250 | try: |
251 | |
252 | ## Build the configuration file |
253 | seq = max_master_sequence() |
254 | v = {'MASTER-SEQUENCE': str(seq), |
255 | 'HK-MASTER': hexhyphens(fingerprint('repos/master.pub', |
256 | 'master-%d' % seq))} |
257 | fin = file('tripe-keys.master') |
258 | fout = file('tmp/tripe-keys.conf', 'w') |
259 | for line in fin: |
260 | fout.write(subst(line, rx_atsubst, v)) |
261 | fin.close(); fout.close() |
262 | SH.copyfile('tmp/tripe-keys.conf', conf_subst('${conf-file}.new')) |
263 | commit = [conf['repos-file'], conf['conf-file']] |
264 | |
265 | ## Make and sign the repository archive |
266 | OS.chdir('tmp') |
267 | run('tar chozf ${repos-file}.new .') |
268 | OS.chdir(cwd) |
269 | for k in master_keys(): |
270 | seq = master_sequence(k) |
271 | sigfile = seqsubst('sig-file', seq) |
272 | run('''catsign -kmaster sign -abdC -kmaster-%d |
273 | -o%s.new ${repos-file}.new''' % (seq, sigfile)) |
274 | commit.append(sigfile) |
275 | |
276 | ## Commit the changes |
277 | for base in commit: |
278 | new = '%s.new' % base |
279 | OS.rename(new, base) |
280 | finally: |
281 | OS.chdir(cwd) |
282 | rmtree('tmp') |
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283 | |
284 | def cmd_update(args): |
285 | cwd = OS.getcwd() |
286 | rmtree('tmp') |
287 | try: |
288 | |
289 | ## Fetch a new distribution |
290 | OS.mkdir('tmp') |
291 | OS.chdir('tmp') |
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292 | seq = int(conf['master-sequence']) |
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293 | run('wget -q -O tripe-keys.tar.gz ${repos-url}') |
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294 | run('wget -q -O tripe-keys.sig %s' % seqsubst('sig-url', seq)) |
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295 | run('tar xfz tripe-keys.tar.gz') |
296 | |
297 | ## Verify the signature |
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298 | want = C.bytes(rx_nonalpha.sub('', conf['hk-master'])) |
299 | got = fingerprint('repos/master.pub', 'master-%d' % seq) |
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300 | if want != got: raise VerifyError |
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301 | run('''catsign -krepos/master.pub verify -avC -kmaster-%d |
302 | -t${sig-fresh} tripe-keys.sig tripe-keys.tar.gz''' % seq) |
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303 | |
304 | ## OK: update our copy |
305 | OS.chdir(cwd) |
306 | if OS.path.exists('repos'): OS.rename('repos', 'repos.old') |
307 | OS.rename('tmp/repos', 'repos') |
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308 | if not FC.cmp('tmp/tripe-keys.conf', 'tripe-keys.conf'): |
309 | moan('configuration file changed: recommend running another update') |
310 | OS.rename('tmp/tripe-keys.conf', 'tripe-keys.conf') |
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311 | rmtree('repos.old') |
312 | |
313 | finally: |
314 | OS.chdir(cwd) |
315 | rmtree('tmp') |
316 | cmd_rebuild(args) |
317 | |
318 | def cmd_rebuild(args): |
319 | zap('keyring.pub') |
320 | for i in OS.listdir('repos'): |
321 | if i.startswith('peer-') and i.endswith('.pub'): |
322 | run('key -kkeyring.pub merge %s' % OS.path.join('repos', i)) |
323 | |
324 | def cmd_generate(args): |
325 | tag, = args |
326 | keyring_pub = 'peer-%s.pub' % tag |
327 | zap('keyring'); zap(keyring_pub) |
328 | run('key -kkeyring merge repos/param') |
329 | run('key -kkeyring add -a${kx} -pparam -e${kx-expire} -t%s tripe-${kx}' % |
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330 | tag) |
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331 | run('key -kkeyring extract -f-secret %s %s' % (keyring_pub, tag)) |
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332 | |
333 | def cmd_clean(args): |
334 | rmtree('repos') |
335 | rmtree('tmp') |
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336 | for i in OS.listdir('.'): |
337 | r = i |
338 | if r.endswith('.old'): r = r[:-4] |
339 | if (r == 'master' or r == 'param' or |
340 | r == 'keyring' or r == 'keyring.pub' or r.startswith('peer-')): |
341 | zap(i) |
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342 | |
343 | ### Main driver |
344 | |
345 | class UsageError (Exception): pass |
346 | |
347 | commands = {'help': (cmd_help, 0, 1, ''), |
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348 | 'newmaster': (cmd_newmaster, 0, 0, ''), |
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349 | 'setup': (cmd_setup, 0, 0, ''), |
350 | 'upload': (cmd_upload, 0, 0, ''), |
351 | 'update': (cmd_update, 0, 0, ''), |
352 | 'clean': (cmd_clean, 0, 0, ''), |
353 | 'generate': (cmd_generate, 1, 1, 'TAG'), |
354 | 'rebuild': (cmd_rebuild, 0, 0, '')} |
355 | |
356 | def init(): |
357 | for f in ['tripe-keys.master', 'tripe-keys.conf']: |
358 | if OS.path.exists(f): |
359 | conf_read(f) |
360 | break |
361 | conf_defaults() |
362 | def main(argv): |
363 | try: |
364 | opts, args = O.getopt(argv[1:], 'hvu', |
365 | ['help', 'version', 'usage']) |
366 | except O.GetoptError, exc: |
367 | moan(exc) |
368 | usage(SYS.stderr) |
369 | SYS.exit(1) |
370 | for o, v in opts: |
371 | if o in ('-h', '--help'): |
372 | cmd_help([]) |
373 | SYS.exit(0) |
374 | elif o in ('-v', '--version'): |
375 | version(SYS.stdout) |
376 | SYS.exit(0) |
377 | elif o in ('-u', '--usage'): |
378 | usage(SYS.stdout) |
379 | SYS.exit(0) |
380 | if len(argv) < 2: |
381 | cmd_help([]) |
382 | else: |
383 | c = argv[1] |
384 | func, min, max, help = commands[c] |
385 | args = argv[2:] |
386 | if len(args) < min or (max > 0 and len(args) > max): |
387 | raise UsageError, (c, help) |
388 | func(args) |
389 | |
390 | init() |
391 | main(SYS.argv) |