| 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 | import shutil as SH |
| 12 | import filecmp as FC |
| 13 | from cStringIO import StringIO |
| 14 | from errno import * |
| 15 | from stat import * |
| 16 | |
| 17 | ### Useful regular expressions |
| 18 | |
| 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\>') |
| 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: |
| 53 | st = OS.lstat(path) |
| 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 | |
| 108 | def conf_subst(s): return subst(s, rx_dollarsubst, conf) |
| 109 | |
| 110 | ## Read the file |
| 111 | def conf_read(f): |
| 112 | lno = 0 |
| 113 | for line in file(f): |
| 114 | lno += 1 |
| 115 | if rx_comment.match(line): continue |
| 116 | if line[-1] == '\n': line = line[:-1] |
| 117 | match = rx_keyval.match(line) |
| 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(): |
| 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}'), |
| 131 | ('conf-file', '${base-dir}tripe-keys.conf'), |
| 132 | ('upload-hook', ': run upload hook'), |
| 133 | ('kx', 'dh'), |
| 134 | ('kx-param', lambda: {'dh': '-LS -b2048 -B256', |
| 135 | 'ec': '-Cnist-p256'}[conf['kx']]), |
| 136 | ('kx-expire', 'now + 1 year'), |
| 137 | ('cipher', 'blowfish-cbc'), |
| 138 | ('hash', 'sha256'), |
| 139 | ('master-keygen-flags', '-l'), |
| 140 | ('mgf', '${hash}-mgf'), |
| 141 | ('mac', lambda: '%s-hmac/%d' % |
| 142 | (conf['hash'], |
| 143 | C.gchashes[conf['hash']].hashsz * 4)), |
| 144 | ('sig', lambda: {'dh': 'dsa', 'ec': 'ecdsa'}[conf['kx']]), |
| 145 | ('sig-fresh', 'always'), |
| 146 | ('sig-genalg', lambda: {'kcdsa': 'dh', |
| 147 | 'dsa': 'dsa', |
| 148 | 'rsapkcs1': 'rsa', |
| 149 | 'rsapss': 'rsa', |
| 150 | 'ecdsa': 'ec', |
| 151 | 'eckcdsa': 'ec'}[conf['sig']]), |
| 152 | ('sig-param', lambda: {'dh': '-LS -b2048 -B256', |
| 153 | 'dsa': '-b2048 -B256', |
| 154 | 'ec': '-Cnist-p256', |
| 155 | 'rsa': '-b2048'}[conf['sig-genalg']]), |
| 156 | ('sig-hash', '${hash}'), |
| 157 | ('sig-expire', 'forever'), |
| 158 | ('fingerprint-hash', '${hash}')]: |
| 159 | try: |
| 160 | if k in conf: continue |
| 161 | if type(v) == str: |
| 162 | conf[k] = conf_subst(v) |
| 163 | else: |
| 164 | conf[k] = v() |
| 165 | except KeyError, exc: |
| 166 | if len(exc.args) == 0: raise |
| 167 | conf[k] = '<missing-var %s>' % exc.args[0] |
| 168 | |
| 169 | ### Commands |
| 170 | |
| 171 | def version(fp = SYS.stdout): |
| 172 | fp.write('%s, %s version %s\n' % (quis, PACKAGE, VERSION)) |
| 173 | |
| 174 | def usage(fp): |
| 175 | fp.write('Usage: %s SUBCOMMAND [ARGS...]\n' % quis) |
| 176 | |
| 177 | def cmd_help(args): |
| 178 | if len(args) == 0: |
| 179 | version(SYS.stdout) |
| 180 | print |
| 181 | usage(SYS.stdout) |
| 182 | print """ |
| 183 | Key management utility for TrIPE. |
| 184 | |
| 185 | Options supported: |
| 186 | |
| 187 | -h, --help Show this help message. |
| 188 | -v, --version Show the version number. |
| 189 | -u, --usage Show pointlessly short usage string. |
| 190 | |
| 191 | Subcommands available: |
| 192 | """ |
| 193 | args = commands.keys() |
| 194 | args.sort() |
| 195 | for c in args: |
| 196 | func, min, max, help = commands[c] |
| 197 | print '%s %s' % (c, help) |
| 198 | |
| 199 | def master_keys(): |
| 200 | if not OS.path.exists('master'): |
| 201 | return |
| 202 | for k in C.KeyFile('master').itervalues(): |
| 203 | if (k.type != 'tripe-keys-master' or |
| 204 | k.expiredp or |
| 205 | not k.tag.startswith('master-')): |
| 206 | continue #?? |
| 207 | yield k |
| 208 | def master_sequence(k): |
| 209 | return int(k.tag[7:]) |
| 210 | def max_master_sequence(): |
| 211 | seq = -1 |
| 212 | for k in master_keys(): |
| 213 | q = master_sequence(k) |
| 214 | if q > seq: seq = q |
| 215 | return seq |
| 216 | def seqsubst(x, q): |
| 217 | return rx_seq.sub(str(q), conf[x]) |
| 218 | |
| 219 | def cmd_newmaster(args): |
| 220 | seq = max_master_sequence() + 1 |
| 221 | run('''key -kmaster add |
| 222 | -a${sig-genalg} !${sig-param} |
| 223 | -e${sig-expire} !${master-keygen-flags} -tmaster-%d tripe-keys-master |
| 224 | sig=${sig} hash=${sig-hash}''' % seq) |
| 225 | run('key -kmaster extract -f-secret repos/master.pub') |
| 226 | |
| 227 | def cmd_setup(args): |
| 228 | OS.mkdir('repos') |
| 229 | run('''key -krepos/param add |
| 230 | -a${kx}-param !${kx-param} |
| 231 | -eforever -tparam tripe-${kx}-param |
| 232 | cipher=${cipher} hash=${hash} mac=${mac} mgf=${mgf}''') |
| 233 | cmd_newmaster(args) |
| 234 | |
| 235 | def cmd_upload(args): |
| 236 | |
| 237 | ## Sanitize the repository directory |
| 238 | umask = OS.umask(0); OS.umask(umask) |
| 239 | mode = 0666 & ~umask |
| 240 | for f in OS.listdir('repos'): |
| 241 | ff = OS.path.join('repos', f) |
| 242 | if (f.startswith('master') or f.startswith('peer-')) \ |
| 243 | and f.endswith('.old'): |
| 244 | OS.unlink(ff) |
| 245 | continue |
| 246 | OS.chmod(ff, mode) |
| 247 | |
| 248 | rmtree('tmp') |
| 249 | OS.mkdir('tmp') |
| 250 | OS.symlink('../repos', 'tmp/repos') |
| 251 | cwd = OS.getcwd() |
| 252 | try: |
| 253 | |
| 254 | ## Build the configuration file |
| 255 | seq = max_master_sequence() |
| 256 | v = {'MASTER-SEQUENCE': str(seq), |
| 257 | 'HK-MASTER': hexhyphens(fingerprint('repos/master.pub', |
| 258 | 'master-%d' % seq))} |
| 259 | fin = file('tripe-keys.master') |
| 260 | fout = file('tmp/tripe-keys.conf', 'w') |
| 261 | for line in fin: |
| 262 | fout.write(subst(line, rx_atsubst, v)) |
| 263 | fin.close(); fout.close() |
| 264 | SH.copyfile('tmp/tripe-keys.conf', conf_subst('${conf-file}.new')) |
| 265 | commit = [conf['repos-file'], conf['conf-file']] |
| 266 | |
| 267 | ## Make and sign the repository archive |
| 268 | OS.chdir('tmp') |
| 269 | run('tar chozf ${repos-file}.new .') |
| 270 | OS.chdir(cwd) |
| 271 | for k in master_keys(): |
| 272 | seq = master_sequence(k) |
| 273 | sigfile = seqsubst('sig-file', seq) |
| 274 | run('''catsign -kmaster sign -abdC -kmaster-%d |
| 275 | -o%s.new ${repos-file}.new''' % (seq, sigfile)) |
| 276 | commit.append(sigfile) |
| 277 | |
| 278 | ## Commit the changes |
| 279 | for base in commit: |
| 280 | new = '%s.new' % base |
| 281 | OS.rename(new, base) |
| 282 | finally: |
| 283 | OS.chdir(cwd) |
| 284 | rmtree('tmp') |
| 285 | run('sh -c ${upload-hook}') |
| 286 | |
| 287 | def cmd_update(args): |
| 288 | cwd = OS.getcwd() |
| 289 | rmtree('tmp') |
| 290 | try: |
| 291 | |
| 292 | ## Fetch a new distribution |
| 293 | OS.mkdir('tmp') |
| 294 | OS.chdir('tmp') |
| 295 | seq = int(conf['master-sequence']) |
| 296 | run('curl -s -o tripe-keys.tar.gz ${repos-url}') |
| 297 | run('curl -s -o tripe-keys.sig %s' % seqsubst('sig-url', seq)) |
| 298 | run('tar xfz tripe-keys.tar.gz') |
| 299 | |
| 300 | ## Verify the signature |
| 301 | want = C.bytes(rx_nonalpha.sub('', conf['hk-master'])) |
| 302 | got = fingerprint('repos/master.pub', 'master-%d' % seq) |
| 303 | if want != got: raise VerifyError |
| 304 | run('''catsign -krepos/master.pub verify -avC -kmaster-%d |
| 305 | -t${sig-fresh} tripe-keys.sig tripe-keys.tar.gz''' % seq) |
| 306 | |
| 307 | ## OK: update our copy |
| 308 | OS.chdir(cwd) |
| 309 | if OS.path.exists('repos'): OS.rename('repos', 'repos.old') |
| 310 | OS.rename('tmp/repos', 'repos') |
| 311 | if not FC.cmp('tmp/tripe-keys.conf', 'tripe-keys.conf'): |
| 312 | moan('configuration file changed: recommend running another update') |
| 313 | OS.rename('tmp/tripe-keys.conf', 'tripe-keys.conf') |
| 314 | rmtree('repos.old') |
| 315 | |
| 316 | finally: |
| 317 | OS.chdir(cwd) |
| 318 | rmtree('tmp') |
| 319 | cmd_rebuild(args) |
| 320 | |
| 321 | def cmd_rebuild(args): |
| 322 | zap('keyring.pub') |
| 323 | for i in OS.listdir('repos'): |
| 324 | if i.startswith('peer-') and i.endswith('.pub'): |
| 325 | run('key -kkeyring.pub merge %s' % OS.path.join('repos', i)) |
| 326 | |
| 327 | def cmd_generate(args): |
| 328 | tag, = args |
| 329 | keyring_pub = 'peer-%s.pub' % tag |
| 330 | zap('keyring'); zap(keyring_pub) |
| 331 | run('key -kkeyring merge repos/param') |
| 332 | run('key -kkeyring add -a${kx} -pparam -e${kx-expire} -t%s tripe-${kx}' % |
| 333 | tag) |
| 334 | run('key -kkeyring extract -f-secret %s %s' % (keyring_pub, tag)) |
| 335 | |
| 336 | def cmd_clean(args): |
| 337 | rmtree('repos') |
| 338 | rmtree('tmp') |
| 339 | for i in OS.listdir('.'): |
| 340 | r = i |
| 341 | if r.endswith('.old'): r = r[:-4] |
| 342 | if (r == 'master' or r == 'param' or |
| 343 | r == 'keyring' or r == 'keyring.pub' or r.startswith('peer-')): |
| 344 | zap(i) |
| 345 | |
| 346 | ### Main driver |
| 347 | |
| 348 | class UsageError (Exception): pass |
| 349 | |
| 350 | commands = {'help': (cmd_help, 0, 1, ''), |
| 351 | 'newmaster': (cmd_newmaster, 0, 0, ''), |
| 352 | 'setup': (cmd_setup, 0, 0, ''), |
| 353 | 'upload': (cmd_upload, 0, 0, ''), |
| 354 | 'update': (cmd_update, 0, 0, ''), |
| 355 | 'clean': (cmd_clean, 0, 0, ''), |
| 356 | 'generate': (cmd_generate, 1, 1, 'TAG'), |
| 357 | 'rebuild': (cmd_rebuild, 0, 0, '')} |
| 358 | |
| 359 | def init(): |
| 360 | for f in ['tripe-keys.master', 'tripe-keys.conf']: |
| 361 | if OS.path.exists(f): |
| 362 | conf_read(f) |
| 363 | break |
| 364 | conf_defaults() |
| 365 | def main(argv): |
| 366 | try: |
| 367 | opts, args = O.getopt(argv[1:], 'hvu', |
| 368 | ['help', 'version', 'usage']) |
| 369 | except O.GetoptError, exc: |
| 370 | moan(exc) |
| 371 | usage(SYS.stderr) |
| 372 | SYS.exit(1) |
| 373 | for o, v in opts: |
| 374 | if o in ('-h', '--help'): |
| 375 | cmd_help([]) |
| 376 | SYS.exit(0) |
| 377 | elif o in ('-v', '--version'): |
| 378 | version(SYS.stdout) |
| 379 | SYS.exit(0) |
| 380 | elif o in ('-u', '--usage'): |
| 381 | usage(SYS.stdout) |
| 382 | SYS.exit(0) |
| 383 | if len(argv) < 2: |
| 384 | cmd_help([]) |
| 385 | else: |
| 386 | c = argv[1] |
| 387 | func, min, max, help = commands[c] |
| 388 | args = argv[2:] |
| 389 | if len(args) < min or (max > 0 and len(args) > max): |
| 390 | raise UsageError, (c, help) |
| 391 | func(args) |
| 392 | |
| 393 | init() |
| 394 | main(SYS.argv) |