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Merge bzr.dev, update to use new hooks.

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bzrlib/gpg.py
1
 
# Copyright (C) 2005 Canonical Ltd
 
1
# Copyright (C) 2005, 2011 Canonical Ltd
2
2
#   Authors: Robert Collins <robert.collins@canonical.com>
3
3
#
4
4
# This program is free software; you can redistribute it and/or modify
19
19
 
20
20
import os
21
21
import sys
 
22
from StringIO import StringIO
22
23
 
23
24
from bzrlib.lazy_import import lazy_import
24
25
lazy_import(globals(), """
30
31
    trace,
31
32
    ui,
32
33
    )
 
34
from bzrlib.i18n import (
 
35
    gettext, 
 
36
    ngettext,
 
37
    )
33
38
""")
34
39
 
 
40
#verification results
 
41
SIGNATURE_VALID = 0
 
42
SIGNATURE_KEY_MISSING = 1
 
43
SIGNATURE_NOT_VALID = 2
 
44
SIGNATURE_NOT_SIGNED = 3
 
45
SIGNATURE_EXPIRED = 4
 
46
 
35
47
 
36
48
class DisabledGPGStrategy(object):
37
49
    """A GPG Strategy that makes everything fail."""
38
50
 
 
51
    @staticmethod
 
52
    def verify_signatures_available():
 
53
        return True
 
54
 
39
55
    def __init__(self, ignored):
40
56
        """Real strategies take a configuration."""
41
57
 
42
58
    def sign(self, content):
43
59
        raise errors.SigningFailed('Signing is disabled.')
44
60
 
 
61
    def verify(self, content, testament):
 
62
        raise errors.SignatureVerificationFailed('Signature verification is \
 
63
disabled.')
 
64
 
 
65
    def set_acceptable_keys(self, command_line_input):
 
66
        pass
 
67
 
45
68
 
46
69
class LoopbackGPGStrategy(object):
47
 
    """A GPG Strategy that acts like 'cat' - data is just passed through."""
 
70
    """A GPG Strategy that acts like 'cat' - data is just passed through.
 
71
    Used in tests.
 
72
    """
 
73
 
 
74
    @staticmethod
 
75
    def verify_signatures_available():
 
76
        return True
48
77
 
49
78
    def __init__(self, ignored):
50
79
        """Real strategies take a configuration."""
53
82
        return ("-----BEGIN PSEUDO-SIGNED CONTENT-----\n" + content +
54
83
                "-----END PSEUDO-SIGNED CONTENT-----\n")
55
84
 
 
85
    def verify(self, content, testament):
 
86
        return SIGNATURE_VALID, None
 
87
 
 
88
    def set_acceptable_keys(self, command_line_input):
 
89
        if command_line_input is not None:
 
90
            patterns = command_line_input.split(",")
 
91
            self.acceptable_keys = []
 
92
            for pattern in patterns:
 
93
                if pattern == "unknown":
 
94
                    pass
 
95
                else:
 
96
                    self.acceptable_keys.append(pattern)
 
97
 
 
98
    def do_verifications(self, revisions, repository):
 
99
        count = {SIGNATURE_VALID: 0,
 
100
                 SIGNATURE_KEY_MISSING: 0,
 
101
                 SIGNATURE_NOT_VALID: 0,
 
102
                 SIGNATURE_NOT_SIGNED: 0,
 
103
                 SIGNATURE_EXPIRED: 0}
 
104
        result = []
 
105
        all_verifiable = True
 
106
        for rev_id in revisions:
 
107
            verification_result, uid =\
 
108
                repository.verify_revision_signature(rev_id,self)
 
109
            result.append([rev_id, verification_result, uid])
 
110
            count[verification_result] += 1
 
111
            if verification_result != SIGNATURE_VALID:
 
112
                all_verifiable = False
 
113
        return (count, result, all_verifiable)
 
114
 
 
115
    def valid_commits_message(self, count):
 
116
        return gettext(u"{0} commits with valid signatures").format(
 
117
                                        count[SIGNATURE_VALID])            
 
118
 
 
119
    def unknown_key_message(self, count):
 
120
        return ngettext(u"{0} commit with unknown key",
 
121
                             u"{0} commits with unknown keys",
 
122
                             count[SIGNATURE_KEY_MISSING]).format(
 
123
                                        count[SIGNATURE_KEY_MISSING])
 
124
 
 
125
    def commit_not_valid_message(self, count):
 
126
        return ngettext(u"{0} commit not valid",
 
127
                             u"{0} commits not valid",
 
128
                             count[SIGNATURE_NOT_VALID]).format(
 
129
                                            count[SIGNATURE_NOT_VALID])
 
130
 
 
131
    def commit_not_signed_message(self, count):
 
132
        return ngettext(u"{0} commit not signed",
 
133
                             u"{0} commits not signed",
 
134
                             count[SIGNATURE_NOT_SIGNED]).format(
 
135
                                        count[SIGNATURE_NOT_SIGNED])
 
136
 
 
137
    def expired_commit_message(self, count):
 
138
        return ngettext(u"{0} commit with key now expired",
 
139
                        u"{0} commits with key now expired",
 
140
                        count[SIGNATURE_EXPIRED]).format(
 
141
                                        count[SIGNATURE_EXPIRED])
 
142
 
56
143
 
57
144
def _set_gpg_tty():
58
145
    tty = os.environ.get('TTY')
70
157
class GPGStrategy(object):
71
158
    """GPG Signing and checking facilities."""
72
159
 
 
160
    acceptable_keys = None
 
161
 
 
162
    @staticmethod
 
163
    def verify_signatures_available():
 
164
        """
 
165
        check if this strategy can verify signatures
 
166
 
 
167
        :return: boolean if this strategy can verify signatures
 
168
        """
 
169
        try:
 
170
            import gpgme
 
171
            return True
 
172
        except ImportError, error:
 
173
            return False
 
174
 
73
175
    def _command_line(self):
74
 
        return [self._config.gpg_signing_command(), '--clearsign']
 
176
        
 
177
        return [self._config.gpg_signing_command(), '--clearsign', '-u',
 
178
                                                self._config.gpg_signing_key()]
75
179
 
76
180
    def __init__(self, config):
77
181
        self._config = config
 
182
        try:
 
183
            import gpgme
 
184
            self.context = gpgme.Context()
 
185
        except ImportError, error:
 
186
            pass # can't use verify()
78
187
 
79
188
    def sign(self, content):
80
189
        if isinstance(content, unicode):
111
220
                raise errors.SigningFailed(self._command_line())
112
221
            else:
113
222
                raise
 
223
 
 
224
    def verify(self, content, testament):
 
225
        """Check content has a valid signature.
 
226
        
 
227
        :param content: the commit signature
 
228
        :param testament: the valid testament string for the commit
 
229
        
 
230
        :return: SIGNATURE_VALID or a failed SIGNATURE_ value, key uid if valid
 
231
        """
 
232
        try:
 
233
            import gpgme
 
234
        except ImportError, error:
 
235
            raise errors.GpgmeNotInstalled(error)
 
236
 
 
237
        signature = StringIO(content)
 
238
        plain_output = StringIO()
 
239
        
 
240
        try:
 
241
            result = self.context.verify(signature, None, plain_output)
 
242
        except gpgme.GpgmeError,error:
 
243
            raise errors.SignatureVerificationFailed(error[2])
 
244
 
 
245
        # No result if input is invalid.
 
246
        # test_verify_invalid()
 
247
        if len(result) == 0:
 
248
            return SIGNATURE_NOT_VALID, None
 
249
        # User has specified a list of acceptable keys, check our result is in it.
 
250
        # test_verify_unacceptable_key()
 
251
        fingerprint = result[0].fpr
 
252
        if self.acceptable_keys is not None:
 
253
            if not fingerprint in self.acceptable_keys:                
 
254
                return SIGNATURE_KEY_MISSING, fingerprint[-8:]
 
255
        # Check the signature actually matches the testament.
 
256
        # test_verify_bad_testament()
 
257
        if testament != plain_output.getvalue():
 
258
            return SIGNATURE_NOT_VALID, None 
 
259
        # Yay gpgme set the valid bit.
 
260
        # Can't write a test for this one as you can't set a key to be
 
261
        # trusted using gpgme.
 
262
        if result[0].summary & gpgme.SIGSUM_VALID:
 
263
            key = self.context.get_key(fingerprint)
 
264
            name = key.uids[0].name
 
265
            email = key.uids[0].email
 
266
            return SIGNATURE_VALID, name + " <" + email + ">"
 
267
        # Sigsum_red indicates a problem, unfortunatly I have not been able
 
268
        # to write any tests which actually set this.
 
269
        if result[0].summary & gpgme.SIGSUM_RED:
 
270
            return SIGNATURE_NOT_VALID, None
 
271
        # GPG does not know this key.
 
272
        # test_verify_unknown_key()
 
273
        if result[0].summary & gpgme.SIGSUM_KEY_MISSING:
 
274
            return SIGNATURE_KEY_MISSING, fingerprint[-8:]
 
275
        # Summary isn't set if sig is valid but key is untrusted
 
276
        # but if user has explicity set the key as acceptable we can validate it.
 
277
        if result[0].summary == 0 and self.acceptable_keys is not None:
 
278
            if fingerprint in self.acceptable_keys:
 
279
                # test_verify_untrusted_but_accepted()
 
280
                return SIGNATURE_VALID, None 
 
281
        # test_verify_valid_but_untrusted()
 
282
        if result[0].summary == 0 and self.acceptable_keys is None:
 
283
            return SIGNATURE_NOT_VALID, None
 
284
        if result[0].summary & gpgme.SIGSUM_KEY_EXPIRED:
 
285
            expires = self.context.get_key(result[0].fpr).subkeys[0].expires
 
286
            if expires > result[0].timestamp:
 
287
                # The expired key was not expired at time of signing.
 
288
                # test_verify_expired_but_valid()
 
289
                return SIGNATURE_EXPIRED, fingerprint[-8:]
 
290
            else:
 
291
                # I can't work out how to create a test where the signature
 
292
                # was expired at the time of signing.
 
293
                return SIGNATURE_NOT_VALID, None
 
294
        # A signature from a revoked key gets this.
 
295
        # test_verify_revoked_signature()
 
296
        if result[0].summary & gpgme.SIGSUM_SYS_ERROR:
 
297
            return SIGNATURE_NOT_VALID, None
 
298
        # Other error types such as revoked keys should (I think) be caught by
 
299
        # SIGSUM_RED so anything else means something is buggy.
 
300
        raise errors.SignatureVerificationFailed("Unknown GnuPG key "\
 
301
                                                 "verification result")
 
302
 
 
303
    def set_acceptable_keys(self, command_line_input):
 
304
        """sets the acceptable keys for verifying with this GPGStrategy
 
305
        
 
306
        :param command_line_input: comma separated list of patterns from
 
307
                                command line
 
308
        :return: nothing
 
309
        """
 
310
        key_patterns = None
 
311
        acceptable_keys_config = self._config.acceptable_keys()
 
312
        try:
 
313
            if isinstance(acceptable_keys_config, unicode):
 
314
                acceptable_keys_config = str(acceptable_keys_config)
 
315
        except UnicodeEncodeError:
 
316
            #gpg Context.keylist(pattern) does not like unicode
 
317
            raise errors.BzrCommandError(gettext('Only ASCII permitted in option names'))
 
318
 
 
319
        if acceptable_keys_config is not None:
 
320
            key_patterns = acceptable_keys_config
 
321
        if command_line_input is not None: #command line overrides config
 
322
            key_patterns = command_line_input
 
323
        if key_patterns is not None:
 
324
            patterns = key_patterns.split(",")
 
325
 
 
326
            self.acceptable_keys = []
 
327
            for pattern in patterns:
 
328
                result = self.context.keylist(pattern)
 
329
                found_key = False
 
330
                for key in result:
 
331
                    found_key = True
 
332
                    self.acceptable_keys.append(key.subkeys[0].fpr)
 
333
                    trace.mutter("Added acceptable key: " + key.subkeys[0].fpr)
 
334
                if not found_key:
 
335
                    trace.note(gettext(
 
336
                            "No GnuPG key results for pattern: {0}"
 
337
                                ).format(pattern))
 
338
 
 
339
    def do_verifications(self, revisions, repository,
 
340
                            process_events_callback=None):
 
341
        """do verifications on a set of revisions
 
342
        
 
343
        :param revisions: list of revision ids to verify
 
344
        :param repository: repository object
 
345
        :param process_events_callback: method to call for GUI frontends that
 
346
                                                want to keep their UI refreshed
 
347
        
 
348
        :return: count dictionary of results of each type,
 
349
                 result list for each revision,
 
350
                 boolean True if all results are verified successfully
 
351
        """
 
352
        count = {SIGNATURE_VALID: 0,
 
353
                 SIGNATURE_KEY_MISSING: 0,
 
354
                 SIGNATURE_NOT_VALID: 0,
 
355
                 SIGNATURE_NOT_SIGNED: 0,
 
356
                 SIGNATURE_EXPIRED: 0}
 
357
        result = []
 
358
        all_verifiable = True
 
359
        for rev_id in revisions:
 
360
            verification_result, uid =\
 
361
                repository.verify_revision_signature(rev_id, self)
 
362
            result.append([rev_id, verification_result, uid])
 
363
            count[verification_result] += 1
 
364
            if verification_result != SIGNATURE_VALID:
 
365
                all_verifiable = False
 
366
            if process_events_callback is not None:
 
367
                process_events_callback()
 
368
        return (count, result, all_verifiable)
 
369
 
 
370
    def verbose_valid_message(self, result):
 
371
        """takes a verify result and returns list of signed commits strings"""
 
372
        signers = {}
 
373
        for rev_id, validity, uid in result:
 
374
            if validity == SIGNATURE_VALID:
 
375
                signers.setdefault(uid, 0)
 
376
                signers[uid] += 1
 
377
        result = []
 
378
        for uid, number in signers.items():
 
379
             result.append( ngettext(u"{0} signed {1} commit", 
 
380
                             u"{0} signed {1} commits",
 
381
                             number).format(uid, number) )
 
382
        return result
 
383
 
 
384
 
 
385
    def verbose_not_valid_message(self, result, repo):
 
386
        """takes a verify result and returns list of not valid commit info"""
 
387
        signers = {}
 
388
        for rev_id, validity, empty in result:
 
389
            if validity == SIGNATURE_NOT_VALID:
 
390
                revision = repo.get_revision(rev_id)
 
391
                authors = ', '.join(revision.get_apparent_authors())
 
392
                signers.setdefault(authors, 0)
 
393
                signers[authors] += 1
 
394
        result = []
 
395
        for authors, number in signers.items():
 
396
            result.append( ngettext(u"{0} commit by author {1}", 
 
397
                                 u"{0} commits by author {1}",
 
398
                                 number).format(number, authors) )
 
399
        return result
 
400
 
 
401
    def verbose_not_signed_message(self, result, repo):
 
402
        """takes a verify result and returns list of not signed commit info"""
 
403
        signers = {}
 
404
        for rev_id, validity, empty in result:
 
405
            if validity == SIGNATURE_NOT_SIGNED:
 
406
                revision = repo.get_revision(rev_id)
 
407
                authors = ', '.join(revision.get_apparent_authors())
 
408
                signers.setdefault(authors, 0)
 
409
                signers[authors] += 1
 
410
        result = []
 
411
        for authors, number in signers.items():
 
412
            result.append( ngettext(u"{0} commit by author {1}", 
 
413
                                 u"{0} commits by author {1}",
 
414
                                 number).format(number, authors) )
 
415
        return result
 
416
 
 
417
    def verbose_missing_key_message(self, result):
 
418
        """takes a verify result and returns list of missing key info"""
 
419
        signers = {}
 
420
        for rev_id, validity, fingerprint in result:
 
421
            if validity == SIGNATURE_KEY_MISSING:
 
422
                signers.setdefault(fingerprint, 0)
 
423
                signers[fingerprint] += 1
 
424
        result = []
 
425
        for fingerprint, number in signers.items():
 
426
            result.append( ngettext(u"Unknown key {0} signed {1} commit", 
 
427
                                 u"Unknown key {0} signed {1} commits",
 
428
                                 number).format(fingerprint, number) )
 
429
        return result
 
430
 
 
431
    def verbose_expired_key_message(self, result, repo):
 
432
        """takes a verify result and returns list of expired key info"""
 
433
        signers = {}
 
434
        fingerprint_to_authors = {}
 
435
        for rev_id, validity, fingerprint in result:
 
436
            if validity == SIGNATURE_EXPIRED:
 
437
                revision = repo.get_revision(rev_id)
 
438
                authors = ', '.join(revision.get_apparent_authors())
 
439
                signers.setdefault(fingerprint, 0)
 
440
                signers[fingerprint] += 1
 
441
                fingerprint_to_authors[fingerprint] = authors
 
442
        result = []
 
443
        for fingerprint, number in signers.items():
 
444
            result.append(ngettext(u"{0} commit by author {1} with "\
 
445
                                    "key {2} now expired", 
 
446
                                   u"{0} commits by author {1} with key {2} now "\
 
447
                                    "expired",
 
448
                                    number).format(number,
 
449
                            fingerprint_to_authors[fingerprint], fingerprint) )
 
450
        return result
 
451
 
 
452
    def valid_commits_message(self, count):
 
453
        """returns message for number of commits"""
 
454
        return gettext(u"{0} commits with valid signatures").format(
 
455
                                        count[SIGNATURE_VALID])
 
456
 
 
457
    def unknown_key_message(self, count):
 
458
        """returns message for number of commits"""
 
459
        return ngettext(u"{0} commit with unknown key",
 
460
                        u"{0} commits with unknown keys",
 
461
                        count[SIGNATURE_KEY_MISSING]).format(
 
462
                                        count[SIGNATURE_KEY_MISSING])
 
463
 
 
464
    def commit_not_valid_message(self, count):
 
465
        """returns message for number of commits"""
 
466
        return ngettext(u"{0} commit not valid",
 
467
                        u"{0} commits not valid",
 
468
                        count[SIGNATURE_NOT_VALID]).format(
 
469
                                            count[SIGNATURE_NOT_VALID])
 
470
 
 
471
    def commit_not_signed_message(self, count):
 
472
        """returns message for number of commits"""
 
473
        return ngettext(u"{0} commit not signed",
 
474
                        u"{0} commits not signed",
 
475
                        count[SIGNATURE_NOT_SIGNED]).format(
 
476
                                        count[SIGNATURE_NOT_SIGNED])
 
477
 
 
478
    def expired_commit_message(self, count):
 
479
        """returns message for number of commits"""
 
480
        return ngettext(u"{0} commit with key now expired",
 
481
                        u"{0} commits with key now expired",
 
482
                        count[SIGNATURE_EXPIRED]).format(
 
483
                                    count[SIGNATURE_EXPIRED])