| 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) |