[issue24430] ZipFile.read() cannot decrypt multiple members from Windows 7zFM

[Serhiy Storchaka]

Change by Serhiy Storchaka :


--
resolution:  -> not a bug
stage:  -> resolved
status: open -> closed

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[issue24430] ZipFile.read() cannot decrypt multiple members from Windows 7zFM

[era]

era added the comment:

The call to .setpassword() doesn't seem to make any difference.  I was hoping 
it would offer a workaround, but it didn't.

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[issue24430] ZipFile.read() cannot decrypt multiple members from Windows 7zfm

[era]

New submission from era:

The attached archive from the Windows version of the 7z file manager (7zFM 
version 9.20) cannot be decrypted into memory.  The first file succeeds, but 
the second one fails.

The following small program is able to unzip other encrypted zip archives 
(tried one created by Linux 7z version 9.04 on Debian from the package 
p7zip-full, and one from plain zip 3.0-3 which comes from the InfoZip 
distribution, as well as a number of archives of unknown provenance) but fails 
on the attached one.

from zipfile import ZipFile
from sys import argv

container = ZipFile(argv[1])
for member in container.namelist():
print(member %s % member)
try:
extracted = container.read(member)
print(extracted %s % repr(extracted)[0:64])
except RuntimeError, err:
extracted = container.read(member, 'hello')
container.setpassword('hello')
print(extracted with password 'hello': %s % repr(extracted)[0:64])

Here is the output and backtrace:

member hello/
extracted ''
member hello/goodbye.txt
Traceback (most recent call last):
  File ./nst.py, line 13, in module
extracted = container.read(member, 'hello')
  File /usr/lib/python2.6/zipfile.py, line 834, in read
return self.open(name, r, pwd).read()
  File /usr/lib/python2.6/zipfile.py, line 901, in open
raise RuntimeError(Bad password for file, name)
RuntimeError: ('Bad password for file', 'hello/goodbye.txt')

The 7z command is able to extract it just fine:

$ 7z -phello x /tmp/hello.zip

7-Zip 9.04 beta  Copyright (c) 1999-2009 Igor Pavlov  2009-05-30
p7zip Version 9.04 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,1 CPU)

Processing archive: /tmp/hello.zip

Extracting  hello
Extracting  hello/goodbye.txt
Extracting  hello/hello.txt

Everything is Ok

Folders: 1
Files: 2
Size:   15
Compressed: 560

--
files: hello.zip
messages: 245165
nosy: era
priority: normal
severity: normal
status: open
title: ZipFile.read() cannot decrypt multiple members from Windows 7zfm
Added file: http://bugs.python.org/file39680/hello.zip

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[issue24430] ZipFile.read() cannot decrypt multiple members from Windows 7zFM

[era]

Changes by era era+pyt...@iki.fi:


--
components: +Library (Lib)
title: ZipFile.read() cannot decrypt multiple members from Windows 7zfm - 
ZipFile.read() cannot decrypt multiple members from Windows 7zFM
type:  - behavior

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