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This fixes a security issue where signatures of the
InRelease files could be circumvented in a man-in-the-middle
attack, giving attackers the ability to serve any packages
they want to a system, in turn giving them root access.
It turns out that getline() may not only return EINVAL
as stated in the documentation - it might also return
in case of an error when allocating memory.
This fix not only adds a check that reading worked
correctly, it also implicitly checks that all writes
worked by reporting any other error that occurred inside
the loop and was logged by apt.
Affected: >= 0.9.8
Reported-By: Jann Horn <jannh@google.com>
Thanks: Jann Horn, Google Project Zero for reporting the issue
LP: #1647467
(cherry picked from commit 51be550c5c38a2e1ddfc2af50a9fab73ccf78026)
(cherry picked from commit 4ef9e0837ce139b398299431ae2294882f531d8e)
(cherry picked from commit 0bbbabb1b961b3b6541e7fdc8061fe6f282eafad)
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Beside being a bit cleaner it hopefully also resolves oddball problems
I have with high levels of parallel jobs.
Git-Dch: Ignore
Reported-By: iwyu (include-what-you-use)
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The most "visible" change is from utime to utimensat/futimens
as the first one isn't part of POSIX anymore.
Reported-By: cppcheck
Git-Dch: Ignore
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No visible functional changes, just code moved around and additional
checks to eliminate impossible branches
Reported-By: scan-build
Git-Dch: Ignore
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if the directory given by $TMPDIR is not available, use /tmp as fallback.
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With the selfgrown splitting we got the problem of not recovering
from networks which just reply with invalid data like those sending
us login pages to authenticate with the network (e.g. hotels) back.
The good thing about the InRelease file is that we know that it must
be clearsigned (a Release file might or might not have a detached sig)
so if we get a file but are unable to split it something is seriously
wrong, so there is not much point in trying further.
The Acquire system already looks out for a NODATA error from gpgv,
so this adds a new error message sent to the acquire system in case
the splitting we do now ourselves failed including this magic word.
Closes: #712486
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free to escape all lines (we have no lines in our files which need
to be escaped as these would be invalid fieldnames) and while ExecGPGV
would detect dash-escaped text as invalid (as its not expected in
messages with detached signatures) it would be possible to "comment"
lines in (signed) dsc files which are only parsed but not verified
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apt-pkg/deb/deblistparser.cc:
- use OpenMaybeClearSignedFile to be free from detecting and
skipping clearsigning metadata in dsc and Release files
We can't write a "clean" file to disk as not all acquire methods copy
Release files before checking them (e.g. cdrom), so this reverts recombining,
but uses the method we use for dsc files also in the two places we
deal with Release files
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* ftparchive/writer.cc:
- use OpenMaybeClearSignedFile to be free from detecting and
skipping clearsigning metadata in dsc files
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into data and signatures, pass it to gpgv for verification and
recombines it after that in a known-good way without unsigned blocks
and whitespaces resulting usually in more or less the same file as
before, but later code can be sure about the format
* apt-pkg/deb/debmetaindex.cc:
- reenable InRelease by default
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- ExecGPGV is a method which should never return, so mark it as such
and fix the inconsistency of returning in error cases
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- rename RunGPGV to ExecGPGV and move it to apt-pkg/contrib/gpgv.cc
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