060ca767 |
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 |
11 | from cStringIO import StringIO |
12 | from errno import * |
13 | from stat import * |
14 | |
15 | ### Useful regular expressions |
16 | |
17 | r_comment = RX.compile(r'^\s*(#|$)') |
18 | r_keyval = RX.compile(r'^\s*([-\w]+)(?:\s+(?!=)|\s*=\s*)(|\S|\S.*\S)\s*$') |
19 | r_dollarsubst = RX.compile(r'\$\{([-\w]+)\}') |
20 | r_atsubst = RX.compile(r'@([-\w]+)@') |
21 | r_nonalpha = RX.compile(r'\W') |
22 | |
23 | ### Utility functions |
24 | |
25 | class SubprocessError (Exception): pass |
26 | class VerifyError (Exception): pass |
27 | |
28 | quis = OS.path.basename(SYS.argv[0]) |
29 | PACKAGE = "@PACKAGE@" |
30 | VERSION = "@VERSION@" |
31 | |
32 | def moan(msg): |
33 | SYS.stderr.write('%s: %s\n' % (quis, msg)) |
34 | |
35 | def die(msg, rc = 1): |
36 | moan(msg) |
37 | SYS.exit(rc) |
38 | |
39 | def subst(s, rx, map): |
40 | out = StringIO() |
41 | i = 0 |
42 | for m in rx.finditer(s): |
43 | out.write(s[i:m.start()] + map[m.group(1)]) |
44 | i = m.end() |
45 | out.write(s[i:]) |
46 | return out.getvalue() |
47 | |
48 | def rmtree(path): |
49 | try: |
50 | st = OS.stat(path) |
51 | except OSError, err: |
52 | if err.errno == ENOENT: |
53 | return |
54 | raise |
55 | if not S_ISDIR(st.st_mode): |
56 | OS.unlink(path) |
57 | else: |
58 | cwd = OS.getcwd() |
59 | try: |
60 | OS.chdir(path) |
61 | for i in OS.listdir('.'): |
62 | rmtree(i) |
63 | finally: |
64 | OS.chdir(cwd) |
65 | OS.rmdir(path) |
66 | |
67 | def zap(file): |
68 | try: |
69 | OS.unlink(file) |
70 | except OSError, err: |
71 | if err.errno == ENOENT: return |
72 | raise |
73 | |
74 | def run(args): |
75 | args = map(conf_subst, args.split()) |
76 | nargs = [] |
77 | for a in args: |
78 | if len(a) > 0 and a[0] != '!': |
79 | nargs += [a] |
80 | else: |
81 | nargs += a[1:].split() |
82 | args = nargs |
83 | print '+ %s' % ' '.join(args) |
84 | rc = OS.spawnvp(OS.P_WAIT, args[0], args) |
85 | if rc != 0: |
86 | raise SubprocessError, rc |
87 | |
88 | def hexhyphens(bytes): |
89 | out = StringIO() |
90 | for i in xrange(0, len(bytes)): |
91 | if i > 0 and i % 4 == 0: out.write('-') |
92 | out.write('%02x' % ord(bytes[i])) |
93 | return out.getvalue() |
94 | |
95 | def fingerprint(kf, ktag): |
96 | h = C.gchashes[conf['fingerprint-hash']]() |
97 | k = C.KeyFile(kf)[ktag].fingerprint(h, '-secret') |
98 | return h.done() |
99 | |
100 | ### Read configuration |
101 | |
102 | class ConfigFileError (Exception): pass |
103 | conf = {} |
104 | |
105 | def conf_subst(s): return subst(s, r_dollarsubst, conf) |
106 | |
107 | ## Read the file |
108 | def conf_read(f): |
109 | lno = 0 |
110 | for line in file(f): |
111 | lno += 1 |
112 | if r_comment.match(line): continue |
113 | if line[-1] == '\n': line = line[:-1] |
114 | match = r_keyval.match(line) |
115 | if not match: |
116 | raise ConfigFileError, "%s:%d: bad line `%s'" % (f, lno, line) |
117 | k, v = match.groups() |
118 | conf[k] = conf_subst(v) |
119 | |
120 | ## Sift the wreckage |
121 | def conf_defaults(): |
122 | for k, v in [('sig-url', '${base-url}tripe-keys.sig'), |
123 | ('repos-url', '${base-url}tripe-keys.tar.gz'), |
124 | ('sig-file', '${base-dir}tripe-keys.sig'), |
125 | ('repos-file', '${base-dir}tripe-keys.tar.gz'), |
126 | ('conf-file', '${base-dir}tripe-keys.conf'), |
127 | ('kx', 'dh'), |
128 | ('kx-param', lambda: {'dh': '-LS -b2048 -B256', |
129 | 'ec': '-Cnist-p256'}[conf['kx']]), |
130 | ('kx-expire', 'now + 1 year'), |
131 | ('cipher', 'blowfish-cbc'), |
132 | ('hash', 'sha256'), |
133 | ('mgf', '${hash}-mgf'), |
134 | ('mac', lambda: '%s-hmac/%d' % |
135 | (conf['hash'], |
136 | C.gchashes[conf['hash']].hashsz * 4)), |
137 | ('sig', lambda: {'dh': 'dsa', 'ec': 'ecdsa'}[conf['kx']]), |
138 | ('sig-fresh', 'always'), |
139 | ('sig-genalg', lambda: {'kcdsa': 'dh', |
140 | 'dsa': 'dsa', |
141 | 'rsapkcs1': 'rsa', |
142 | 'rsapss': 'rsa', |
143 | 'ecdsa': 'ec', |
144 | 'eckcdsa': 'ec'}[conf['sig']]), |
145 | ('sig-param', lambda: {'dh': '-LS -b2048 -B256', |
146 | 'dsa': '-b2048 -B256', |
147 | 'ec': '-Cnist-p256', |
148 | 'rsa': '-b2048'}[conf['sig-genalg']]), |
149 | ('sig-hash', '${hash}'), |
150 | ('sig-expire', 'forever'), |
151 | ('fingerprint-hash', '${hash}')]: |
152 | try: |
153 | if k in conf: continue |
154 | if type(v) == str: |
155 | conf[k] = conf_subst(v) |
156 | else: |
157 | conf[k] = v() |
158 | except KeyError, exc: |
159 | if len(exc.args) == 0: raise |
160 | conf[k] = '<missing-var %s>' % exc.args[0] |
161 | |
162 | ### Commands |
163 | |
164 | def version(fp = SYS.stdout): |
165 | fp.write('%s, %s version %s\n' % (quis, PACKAGE, VERSION)) |
166 | |
167 | def usage(fp): |
168 | fp.write('Usage: %s SUBCOMMAND [ARGS...]\n' % quis) |
169 | |
170 | def cmd_help(args): |
171 | if len(args) == 0: |
172 | version(SYS.stdout) |
173 | print |
174 | usage(SYS.stdout) |
175 | print """ |
176 | Key management utility for TrIPE. |
177 | |
178 | Options supported: |
179 | |
180 | -h, --help Show this help message. |
181 | -v, --version Show the version number. |
182 | -u, --usage Show pointlessly short usage string. |
183 | |
184 | Subcommands available: |
185 | """ |
186 | args = commands.keys() |
187 | args.sort() |
188 | for c in args: |
189 | func, min, max, help = commands[c] |
190 | print '%s %s' % (c, help) |
191 | |
192 | def cmd_setup(args): |
193 | OS.mkdir('repos') |
194 | |
195 | ## Generate the master key |
196 | run('''key -kmaster add |
197 | -a${sig-genalg} !${sig-param} |
198 | -e${sig-expire} -l -ttripe-keys-master ccsig |
199 | sig=${sig} hash=${sig-hash}''') |
200 | run('key -kmaster extract -f-secret repos/master.pub tripe-keys-master') |
201 | |
202 | ## Generate the parameters key |
203 | run('''key -krepos/param add |
204 | -a${kx}-param !${kx-param} |
205 | -eforever -tparam tripe-${kx}-param |
206 | cipher=${cipher} hash=${hash} mac=${mac} mgf=${mgf}''') |
207 | |
208 | ## Get fingerprints |
209 | print 'Setup OK: master key = %s' % \ |
210 | hexhyphens(fingerprint('repos/master.pub', 'tripe-keys-master')) |
211 | |
212 | def cmd_upload(args): |
213 | |
214 | ## Sanitize the repository directory |
215 | umask = OS.umask(0); OS.umask(umask) |
216 | mode = 0666 & ~umask |
217 | for f in OS.listdir('repos'): |
218 | ff = OS.path.join('repos', f) |
219 | if f.endswith('.old'): |
220 | OS.unlink(ff) |
221 | continue |
222 | OS.chmod(OS.path.join('repos', f), mode) |
223 | |
224 | ## Build the configuration file |
225 | v = {'HK-MASTER': hexhyphens(fingerprint('repos/master.pub', |
226 | 'tripe-keys-master'))} |
227 | fin = file('tripe-keys.master') |
228 | fout = file(conf_subst('${conf-file}.new'), 'w') |
229 | for line in fin: |
230 | fout.write(subst(line, r_atsubst, v)) |
231 | fin.close(); fout.close() |
232 | |
233 | ## Make and sign the repository archive |
234 | run('tar chozf ${repos-file}.new repos') |
235 | run('''catsign -kmaster sign -abdC -ktripe-keys-master |
236 | -o${sig-file}.new ${repos-file}.new''') |
237 | |
238 | ## Commit the changes |
239 | for i in ['conf-file', 'repos-file', 'sig-file']: |
240 | base = conf[i] |
241 | new = '%s.new' % base |
242 | OS.rename(new, base) |
243 | |
244 | def cmd_update(args): |
245 | cwd = OS.getcwd() |
246 | rmtree('tmp') |
247 | try: |
248 | |
249 | ## Fetch a new distribution |
250 | OS.mkdir('tmp') |
251 | OS.chdir('tmp') |
252 | run('wget -q -O tripe-keys.tar.gz ${repos-url}') |
253 | run('wget -q -O tripe-keys.sig ${sig-url}') |
254 | run('tar xfz tripe-keys.tar.gz') |
255 | |
256 | ## Verify the signature |
257 | want = C.bytes(r_nonalpha.sub('', conf['hk-master'])) |
258 | got = fingerprint('repos/master.pub', 'tripe-keys-master') |
259 | if want != got: raise VerifyError |
260 | run('''catsign -krepos/master.pub verify -avC -ktripe-keys-master |
261 | -t${sig-fresh} tripe-keys.sig tripe-keys.tar.gz''') |
262 | |
263 | ## OK: update our copy |
264 | OS.chdir(cwd) |
265 | if OS.path.exists('repos'): OS.rename('repos', 'repos.old') |
266 | OS.rename('tmp/repos', 'repos') |
267 | rmtree('repos.old') |
268 | |
269 | finally: |
270 | OS.chdir(cwd) |
271 | rmtree('tmp') |
272 | cmd_rebuild(args) |
273 | |
274 | def cmd_rebuild(args): |
275 | zap('keyring.pub') |
276 | for i in OS.listdir('repos'): |
277 | if i.startswith('peer-') and i.endswith('.pub'): |
278 | run('key -kkeyring.pub merge %s' % OS.path.join('repos', i)) |
279 | |
280 | def cmd_generate(args): |
281 | tag, = args |
282 | keyring_pub = 'peer-%s.pub' % tag |
283 | zap('keyring'); zap(keyring_pub) |
284 | run('key -kkeyring merge repos/param') |
285 | run('key -kkeyring add -a${kx} -pparam -e${kx-expire} -t%s tripe-${kx}' % |
286 | (tag,)) |
287 | run('key -kkeyring extract -f-secret %s %s' % (keyring_pub, tag)) |
288 | print 'Generated %s key = %s' % \ |
289 | (tag, |
290 | hexhyphens(fingerprint('repos/master.pub', 'tripe-keys-master'))) |
291 | |
292 | |
293 | def cmd_clean(args): |
294 | rmtree('repos') |
295 | rmtree('tmp') |
296 | for i in 'master', 'keyring.pub': |
297 | zap(i) |
298 | zap('%s.old' % i) |
299 | |
300 | ### Main driver |
301 | |
302 | class UsageError (Exception): pass |
303 | |
304 | commands = {'help': (cmd_help, 0, 1, ''), |
305 | 'setup': (cmd_setup, 0, 0, ''), |
306 | 'upload': (cmd_upload, 0, 0, ''), |
307 | 'update': (cmd_update, 0, 0, ''), |
308 | 'clean': (cmd_clean, 0, 0, ''), |
309 | 'generate': (cmd_generate, 1, 1, 'TAG'), |
310 | 'rebuild': (cmd_rebuild, 0, 0, '')} |
311 | |
312 | def init(): |
313 | for f in ['tripe-keys.master', 'tripe-keys.conf']: |
314 | if OS.path.exists(f): |
315 | conf_read(f) |
316 | break |
317 | conf_defaults() |
318 | def main(argv): |
319 | try: |
320 | opts, args = O.getopt(argv[1:], 'hvu', |
321 | ['help', 'version', 'usage']) |
322 | except O.GetoptError, exc: |
323 | moan(exc) |
324 | usage(SYS.stderr) |
325 | SYS.exit(1) |
326 | for o, v in opts: |
327 | if o in ('-h', '--help'): |
328 | cmd_help([]) |
329 | SYS.exit(0) |
330 | elif o in ('-v', '--version'): |
331 | version(SYS.stdout) |
332 | SYS.exit(0) |
333 | elif o in ('-u', '--usage'): |
334 | usage(SYS.stdout) |
335 | SYS.exit(0) |
336 | if len(argv) < 2: |
337 | cmd_help([]) |
338 | else: |
339 | c = argv[1] |
340 | func, min, max, help = commands[c] |
341 | args = argv[2:] |
342 | if len(args) < min or (max > 0 and len(args) > max): |
343 | raise UsageError, (c, help) |
344 | func(args) |
345 | |
346 | init() |
347 | main(SYS.argv) |