Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  closed
Component:  HTTP handling  |  Version:  master
 Severity:  Normal |   Resolution:  fixed
 Keywords: | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+
Changes (by Claude Paroz ):

 * status:  new => closed
 * resolution:   => fixed


Comment:

 In [changeset:"e1424b237003723c12400b5e1cfd95c87650e62b"]:
 {{{
 #!CommitTicketReference repository=""
 revision="e1424b237003723c12400b5e1cfd95c87650e62b"
 Fixed #23397 -- Stripped whitespace from base64 during chunking

 This insures the actual base64 content has a length a multiple of 4.
 Also added a test case for the failure.
 }}}

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Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  master
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+

Comment (by jhobbs):

 I hit this working on MAAS - http://launchpad.net/maas - which uses Django
 for its web interface and API. We recently added an API call for uploading
 large files, which is where I ran into this.

 MAAS's cli uses python stdlib's Email.generator to build multipart
 requests (http://bazaar.launchpad.net/~maas-
 maintainers/maas/trunk/view/head:/src/apiclient/multipart.py).

 Here's the original bug on launchpad:
 https://bugs.launchpad.net/maas/+bug/1363348

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Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  master
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+
Changes (by timgraham):

 * needs_docs:  1 => 0


Comment:

 This looks like more of a bug fix than a "feature" so the release notes
 probably aren't required. Could you give some background how you
 encountered this issue so I can better understand it?

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Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  master
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+
Changes (by jhobbs):

 * needs_better_patch:  1 => 0


Comment:

 I've fixed the python3 test failures and added documentation to the
 release note.

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Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  master
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Accepted
Has patch:  1  |  Needs documentation:  1
  Needs tests:  0  |  Patch needs improvement:  1
Easy pickings:  0  |UI/UX:  0
---+
Changes (by bmispelon):

 * needs_better_patch:  0 => 1
 * stage:  Unreviewed => Accepted
 * version:  1.6 => master
 * needs_docs:  0 => 1


Comment:

 Hi,

 Indeed, there seem to be a bug here.

 I can't say whether your fix is the right approach, but it does seem to
 fix the issue and the testcase you added currently fails which is a good
 sign.
 The testcase fails on python3 however, and the PR is missing some
 documentation (a mention in the release notes for 1.8).

 I'm checking `patch needs improvement`. Please uncheck it when you've
 fixed the two points above.

 Thanks

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Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+--
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  1.6
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Unreviewed
Has patch:  1  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--
Changes (by jhobbs):

 * has_patch:  0 => 1


Old description:

> Large files are files larger than the chunk size in
> MultiPartParser.parse().
>
> parse() tries to process base64 encoded files in chunks with lengths a
> multiple of 4. The base64 encoded string can contain newline characters,
> which aren't significant in base64 and should be ignored, but are counted
> toward's a chunk's length in parse(). This means when whitespace is
> stripped from the string, the count of base64 encoded characters may not
> be a multiple of 4, leading to an "Incorrect padding" error.
>
> Here's a testcase for creating this failure:
>
> https://github.com/jhobbs/django/commit/98347e396133990b82b596310e4490369ba676d5
>
> Stacktrace:
> {{{
> Traceback (most recent call last):
>   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
> line 109, in test_big_base64_newlines_upload
> "Big data" * 68000, encode=base64.encodestring)
>   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
> line 96, in _test_base64_upload
> response = self.client.request(**r)
>   File "/home/jason/canonical/code/django/django/test/client.py", line
> 443, in request
> six.reraise(*exc_info)
>   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
> line 121, in get_response
> response = wrapped_callback(request, *callback_args,
> **callback_kwargs)
>   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
> line 103, in file_upload_echo_content
> r = dict((k, f.read().decode('utf-8')) for k, f in
> request.FILES.items())
>   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
> line 152, in _get_files
> self._load_post_and_files()
>   File "/home/jason/canonical/code/django/django/http/request.py", line
> 249, in _load_post_and_files
> self._post, self._files = self.parse_file_upload(self.META, data)
>   File "/home/jason/canonical/code/django/django/http/request.py", line
> 214, in parse_file_upload
> return parser.parse()
>   File
> "/home/jason/canonical/code/django/django/http/multipartparser.py", line
> 220, in parse
> six.reraise(MultiPartParserError, MultiPartParserError(msg),
> sys.exc_info()[2])
>   File
> "/home/jason/canonical/code/django/django/http/multipartparser.py", line
> 216, in parse
> chunk = base64.b64decode(chunk)
>   File "/usr/lib/python2.7/base64.py", line 76, in b64decode
> raise TypeError(msg)
> MultiPartParserError: Could not decode base64 data:
> TypeError(Error('Incorrect padding',),)
> }}}

New description:

 Large files are files larger than the chunk size in
 MultiPartParser.parse().

 parse() tries to process base64 encoded files in chunks with lengths a
 multiple of 4. The base64 encoded string can contain newline characters,
 which aren't significant in base64 and should be ignored, but are counted
 toward's a chunk's length in parse(). This means when whitespace is
 stripped from the string, the count of base64 encoded characters may not
 be a multiple of 4, leading to an "Incorrect padding" error.

 This pull request has a testcase for producing the failure and a proposed
 patch to fix the issue.

 https://github.com/django/django/pull/3151/files

 Stacktrace:
 {{{
 Traceback (most recent call last):
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 109, in test_big_base64_newlines_upload
 "Big data" * 68000, encode=base64.encodestring)
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 96, in _test_base64_upload
 response = self.client.request(**r)
   File "/home/jason/canonical/code/django/django/test/client.py", line
 443, in request
 six.reraise(*exc_info)
   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
 line 121, in get_response
 response = wrapped_callback(request, *callback_args,
 **callback_kwargs)
   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
 line 103, in file_upload_echo_content
 r = dict((k, f.read().decode('utf-8')) for k, f in
 request.FILES.items())
   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
 line 152, in _get_files
 self._load_post_and_files()
   File "/

Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+--
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  1.6
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--
Description changed by jhobbs:

Old description:

> Large files are files larger than the chunk size in
> MultiPartParser.parse().
>
> Parse tries to process base64 encoded files in chunks with lengths a
> multiple of 4. The base64 encoded string can contain newline characters,
> which aren't significant in base64 and should be ignored, but are counted
> toward's a chunk's length in parse(). This means when whitespace is
> stripped from the string, the count of base64 encoded characters may not
> be a multiple of 4, leading to an "Incorrect padding" error.
>
> Here's a testcase for creating this failure:
>
> https://github.com/jhobbs/django/commit/98347e396133990b82b596310e4490369ba676d5
>
> Stacktrace:
> {{{
> Traceback (most recent call last):
>   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
> line 109, in test_big_base64_newlines_upload
> "Big data" * 68000, encode=base64.encodestring)
>   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
> line 96, in _test_base64_upload
> response = self.client.request(**r)
>   File "/home/jason/canonical/code/django/django/test/client.py", line
> 443, in request
> six.reraise(*exc_info)
>   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
> line 121, in get_response
> response = wrapped_callback(request, *callback_args,
> **callback_kwargs)
>   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
> line 103, in file_upload_echo_content
> r = dict((k, f.read().decode('utf-8')) for k, f in
> request.FILES.items())
>   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
> line 152, in _get_files
> self._load_post_and_files()
>   File "/home/jason/canonical/code/django/django/http/request.py", line
> 249, in _load_post_and_files
> self._post, self._files = self.parse_file_upload(self.META, data)
>   File "/home/jason/canonical/code/django/django/http/request.py", line
> 214, in parse_file_upload
> return parser.parse()
>   File
> "/home/jason/canonical/code/django/django/http/multipartparser.py", line
> 220, in parse
> six.reraise(MultiPartParserError, MultiPartParserError(msg),
> sys.exc_info()[2])
>   File
> "/home/jason/canonical/code/django/django/http/multipartparser.py", line
> 216, in parse
> chunk = base64.b64decode(chunk)
>   File "/usr/lib/python2.7/base64.py", line 76, in b64decode
> raise TypeError(msg)
> MultiPartParserError: Could not decode base64 data:
> TypeError(Error('Incorrect padding',),)
> }}}

New description:

 Large files are files larger than the chunk size in
 MultiPartParser.parse().

 parse() tries to process base64 encoded files in chunks with lengths a
 multiple of 4. The base64 encoded string can contain newline characters,
 which aren't significant in base64 and should be ignored, but are counted
 toward's a chunk's length in parse(). This means when whitespace is
 stripped from the string, the count of base64 encoded characters may not
 be a multiple of 4, leading to an "Incorrect padding" error.

 Here's a testcase for creating this failure:

 
https://github.com/jhobbs/django/commit/98347e396133990b82b596310e4490369ba676d5

 Stacktrace:
 {{{
 Traceback (most recent call last):
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 109, in test_big_base64_newlines_upload
 "Big data" * 68000, encode=base64.encodestring)
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 96, in _test_base64_upload
 response = self.client.request(**r)
   File "/home/jason/canonical/code/django/django/test/client.py", line
 443, in request
 six.reraise(*exc_info)
   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
 line 121, in get_response
 response = wrapped_callback(request, *callback_args,
 **callback_kwargs)
   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
 line 103, in file_upload_echo_content
 r = dict((k, f.read().decode('utf-8')) for k, f in
 request.FILES.items())
   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
 line 152, in _get_files
 self._load_post_and_files()
   File "/home/jason/canonical/code/django/djan

Re: [Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+--
 Reporter:  jhobbs |Owner:  nobody
 Type:  Bug|   Status:  new
Component:  HTTP handling  |  Version:  1.6
 Severity:  Normal |   Resolution:
 Keywords: | Triage Stage:  Unreviewed
Has patch:  0  |  Needs documentation:  0
  Needs tests:  0  |  Patch needs improvement:  0
Easy pickings:  0  |UI/UX:  0
---+--
Changes (by jhobbs):

 * needs_better_patch:   => 0
 * needs_tests:   => 0
 * needs_docs:   => 0


Old description:

> Large files are files larger than the chunk size in
> MultiPartParser.parse().
>
> Parse tries to process base64 encoded files in chunks with lengths a
> multiple of 4. The base64 encoded string can contain newline characters,
> which aren't significant in base64 and should be ignored, but are counted
> toward's a chunk's length in parse(). This means when whitespace is
> stripped from the string, the count of base64 encoded characters may not
> be a multiple of 4, leading to an "Incorrect padding" error.
>
> Stacktrace:
> {{{
> Traceback (most recent call last):
>   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
> line 109, in test_big_base64_newlines_upload
> "Big data" * 68000, encode=base64.encodestring)
>   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
> line 96, in _test_base64_upload
> response = self.client.request(**r)
>   File "/home/jason/canonical/code/django/django/test/client.py", line
> 443, in request
> six.reraise(*exc_info)
>   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
> line 121, in get_response
> response = wrapped_callback(request, *callback_args,
> **callback_kwargs)
>   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
> line 103, in file_upload_echo_content
> r = dict((k, f.read().decode('utf-8')) for k, f in
> request.FILES.items())
>   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
> line 152, in _get_files
> self._load_post_and_files()
>   File "/home/jason/canonical/code/django/django/http/request.py", line
> 249, in _load_post_and_files
> self._post, self._files = self.parse_file_upload(self.META, data)
>   File "/home/jason/canonical/code/django/django/http/request.py", line
> 214, in parse_file_upload
> return parser.parse()
>   File
> "/home/jason/canonical/code/django/django/http/multipartparser.py", line
> 220, in parse
> six.reraise(MultiPartParserError, MultiPartParserError(msg),
> sys.exc_info()[2])
>   File
> "/home/jason/canonical/code/django/django/http/multipartparser.py", line
> 216, in parse
> chunk = base64.b64decode(chunk)
>   File "/usr/lib/python2.7/base64.py", line 76, in b64decode
> raise TypeError(msg)
> MultiPartParserError: Could not decode base64 data:
> TypeError(Error('Incorrect padding',),)
> }}}

New description:

 Large files are files larger than the chunk size in
 MultiPartParser.parse().

 Parse tries to process base64 encoded files in chunks with lengths a
 multiple of 4. The base64 encoded string can contain newline characters,
 which aren't significant in base64 and should be ignored, but are counted
 toward's a chunk's length in parse(). This means when whitespace is
 stripped from the string, the count of base64 encoded characters may not
 be a multiple of 4, leading to an "Incorrect padding" error.

 Here's a testcase for creating this failure:

 
https://github.com/jhobbs/django/commit/98347e396133990b82b596310e4490369ba676d5

 Stacktrace:
 {{{
 Traceback (most recent call last):
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 109, in test_big_base64_newlines_upload
 "Big data" * 68000, encode=base64.encodestring)
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 96, in _test_base64_upload
 response = self.client.request(**r)
   File "/home/jason/canonical/code/django/django/test/client.py", line
 443, in request
 six.reraise(*exc_info)
   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
 line 121, in get_response
 response = wrapped_callback(request, *callback_args,
 **callback_kwargs)
   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
 line 103, in file_upload_echo_content
 r = dict((k, f.read().decode('utf-8')) for k, f in
 request.FILES.items())
   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
 line 152, in _get_files
 self._load_post_and_files()
   File "/home/jason/canonical/code/django/django/http/request.py", line
 249, in _load_post_and_files
 self._po

[Django] #23397: Multipart base64 file decoding of fails with large files when the encoded string contains newlines.

[Django]

#23397: Multipart base64 file decoding of fails with large files when the 
encoded
string contains newlines.
---+
 Reporter:  jhobbs |  Owner:  nobody
 Type:  Bug| Status:  new
Component:  HTTP handling  |Version:  1.6
 Severity:  Normal |   Keywords:
 Triage Stage:  Unreviewed |  Has patch:  0
Easy pickings:  0  |  UI/UX:  0
---+
 Large files are files larger than the chunk size in
 MultiPartParser.parse().

 Parse tries to process base64 encoded files in chunks with lengths a
 multiple of 4. The base64 encoded string can contain newline characters,
 which aren't significant in base64 and should be ignored, but are counted
 toward's a chunk's length in parse(). This means when whitespace is
 stripped from the string, the count of base64 encoded characters may not
 be a multiple of 4, leading to an "Incorrect padding" error.

 Stacktrace:
 {{{
 Traceback (most recent call last):
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 109, in test_big_base64_newlines_upload
 "Big data" * 68000, encode=base64.encodestring)
   File "/home/jason/canonical/code/django/tests/file_uploads/tests.py",
 line 96, in _test_base64_upload
 response = self.client.request(**r)
   File "/home/jason/canonical/code/django/django/test/client.py", line
 443, in request
 six.reraise(*exc_info)
   File "/home/jason/canonical/code/django/django/core/handlers/base.py",
 line 121, in get_response
 response = wrapped_callback(request, *callback_args,
 **callback_kwargs)
   File "/home/jason/canonical/code/django/tests/file_uploads/views.py",
 line 103, in file_upload_echo_content
 r = dict((k, f.read().decode('utf-8')) for k, f in
 request.FILES.items())
   File "/home/jason/canonical/code/django/django/core/handlers/wsgi.py",
 line 152, in _get_files
 self._load_post_and_files()
   File "/home/jason/canonical/code/django/django/http/request.py", line
 249, in _load_post_and_files
 self._post, self._files = self.parse_file_upload(self.META, data)
   File "/home/jason/canonical/code/django/django/http/request.py", line
 214, in parse_file_upload
 return parser.parse()
   File "/home/jason/canonical/code/django/django/http/multipartparser.py",
 line 220, in parse
 six.reraise(MultiPartParserError, MultiPartParserError(msg),
 sys.exc_info()[2])
   File "/home/jason/canonical/code/django/django/http/multipartparser.py",
 line 216, in parse
 chunk = base64.b64decode(chunk)
   File "/usr/lib/python2.7/base64.py", line 76, in b64decode
 raise TypeError(msg)
 MultiPartParserError: Could not decode base64 data:
 TypeError(Error('Incorrect padding',),)
 }}}

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Ticket URL: 
Django 
The Web framework for perfectionists with deadlines.

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