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APT in 1.6 saw me rewriting the mirror:// transport method, which works
comparable to the decommissioned httpredir.d.o "just" that apt requests
a mirror list and performs all the redirections internally with all the
bells like parallel download and automatic fallback (more details in the
apt-transport-mirror manpage included in the 1.6 release).
The automatic fallback is the problem here: The intend is that if a file
fails to be downloaded (e.g. because the mirror is offline, broken,
out-of-sync, …) instead of erroring out the next mirror in the list is
contacted for a retry of the download.
Internally the acquire process of an InRelease file (works with the
Release/Release.gpg pair, too) happens in steps: 1) download file and 2)
verify file, both handled as URL requests passed around. Due to an
oversight the fallbacks for the first step are still active for the
second step, so that the successful download from another mirror stands
in for the failed verification… *facepalm*
Note that the attacker can not judge by the request arriving for the
InRelease file if the user is using the mirror method or not. If entire
traffic is observed Eve might be able to observe the request for
a mirror list, but that might or might not be telling if following
requests for InRelease files will be based on that list or for another
sources.list entry not using mirror (Users have also the option to have
the mirror list locally (via e.g. mirror+file://) instead of on a remote
host). If the user isn't using mirror:// for this InRelease file apt
will fail very visibly as intended.
(The mirror list needs to include at least two mirrors and to work
reliably the attacker needs to be able to MITM all mirrors in the list.
For remotely accessed mirror lists this is no limitation as the attacker
is in full control of the file in that case)
Fixed by clearing the alternatives after a step completes (and moving a pimpl
class further to the top to make that valid compilable code). mirror://
is at the moment the only method using this code infrastructure (for all
others this set is already empty) and the only method-independent user
so far is the download of deb files, but those are downloaded and
verified in a single step; so there shouldn't be much opportunity for
regression here even through a central code area is changed.
Upgrade instructions: Given all apt-based frontends are affected, even
additional restrictions like signed-by are bypassed and the attack in
progress is hardly visible in the progress reporting of an update
operation (the InRelease file is marked "Ign", but no fallback to
"Release/Release.gpg" is happening) and leaves no trace (expect files
downloaded from the attackers repository of course) the best course of
action might be to change the sources.list to not use the mirror family
of transports ({tor+,…}mirror{,+{http{,s},file,…}}) until a fixed
version of the src:apt packages are installed.
Regression-Of: 355e1aceac1dd05c4c7daf3420b09bd860fd169d,
57fa854e4cdb060e87ca265abd5a83364f9fa681
LP: #1787752
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debSystem uses a reference counted lock, so you can acquire it
multiple times in your applications, possibly nested. Nesting
locks causes a fd leak, though, as we only increment the lock
count when we already have locked twice, rather than once, and
hence when we call lock the second time, instead of increasing
the lock count, we open another lock fd.
This fixes the code to check if we have locked at all (> 0).
There is no practical problem here aside from the fd leak, as
closing the new fd releases the lock on the old one due to the
weird semantics of fcntl locks.
(cherry picked from commit 79f012bd09ae99d4c9d63dc0ac960376b5338b32)
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Only use zstd defined variables if zstd was found.
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pu/zstd
See merge request apt-team/apt!8
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This implements support for multi frame files while keeping
error checking for unexpected EOF working correctly. Files
with multiple frames are generated by pzstd, for example.
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This is a simplified variant of the code for xz, adapted to support
multiple digit integers.
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Reported-By: lintian spelling-error-in-manpage
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Shipping 1.6 with major 12 would not allow us to update 1.5.y
in a different way than 1.6.y if we have to without resorting
to minor version hacks. Let's just bump the major instead.
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We just enabled https on changelogs.ubuntu.com, let's use it.
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zstd is a compression algorithm developed by facebook. At level 19,
it is about 6% worse in size than xz -6, but decompression is multiple
times faster, saving about 40% install time, especially with eatmydata
on cloud instances.
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Check that Date of Release file is not in the future
See merge request apt-team/apt!3
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By restricting the Date field to be in the past, an attacker cannot
just create a repository from the future that would be accepted as
a valid update for a repository.
This check can be disabled by Acquire::Check-Date set to false. This
will also disable Check-Valid-Until and any future date related checking,
if any - the option means: "my computers date cannot be trusted."
Modify the tests to allow repositories to be up to 10 hours in the
future, so we can keep using hours there to simulate time changes.
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The interesting takeaway here is perhaps that 'chmod +w' is effected by
the umask – obvious in hindsight of course. The usual setup helps with
hiding that applying that recursively on all directories (and files)
isn't correct. Ensuring files will not be stored with the wrong
permissions even if in strange umask contexts is trivial in comparison.
Fixing the test also highlighted that it wasn't bulletproof as apt will
automatically fix the permissions of the directories it works with, so
for this test we actually need to introduce a shortcut in the code.
Reported-By: Ubuntu autopkgtest CI
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This was broken by a refactoring in 1adcf56bec7d2127d83aa423916639740fe8e586
which iterated over getCompressorExtensions() instead of the compressors and
using their extension field. getCompressorExtensions() does not contain the
empty extension for uncompressed files, though, and hence this was broken.
LP: #1746807
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apt 1.6~alpha6 introduced aux requests to revamp the implementation of
a-t-mirror. This already included the potential of running as non-root,
but the detection wasn't complete resulting in errors or could produce
spurious warnings along the way if the directory didn't exist yet.
References: ef9677831f62a1554a888ebc7b162517d7881116
Closes: 887624
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Allow specifying an alternative path to the InRelease file, so
you can have multiple versions of a repository, for example.
Enabling this option disables fallback to Release and Release.gpg,
so setting it to InRelease can be used to ensure that only that
will be tried.
We add two test cases: One for checking that it works, and another
for checking that the fallback does not happen.
Closes: #886745
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The summary line sounds a bit much: what we end up doing is just adding
two more guards before using results which should always be valid™.
That these values aren't valid is likely a bug in itself somewhere, but
that is no reason for crashing.
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The appended "partial" should not be translated, but some translations
got this wrong and now that there is also "auxfiles" we can just fix
that problem by hiding these untranslatables from the translators.
Gbp-Dch: Ignore
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Allowing a method to request work from other methods is a powerful
capability which could be misused or exploited, so to slightly limited
the surface let method opt-in into this capability on startup.
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Embedding an entire acquire stack and HTTP logic in the mirror method
made it rather heavy weight and fragile. This reimplement goes the other
way by doing only the bare minimum in the method itself and instead
redirect the actual download of files to their proper methods.
The reimplementation drops the (in the real world) unused query-string
feature as it isn't really implementable in the new architecture.
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If a method needs a file to operate like e.g. mirror needs to get a list
of mirrors before it can redirect the the actual requests to them. That
could easily be solved by moving the logic into libapt directly, but by
allowing a method to request other methods to do something we can keep
this logic contained in the method and allow e.g. also methods which
perform binary patching or similar things.
Previously they would need to implement their own acquire system inside
the existing one which in all likelyhood will not support the same
features and methods nor operate with similar security compared to what
we have already running 'above' the requesting method. That said, to
avoid methods producing conflicts with "proper" files we are downloading
a new directory is introduced to keep the auxiliary files in.
[The message magic number 351 is a tribute to the german Grundgesetz
article 35 paragraph 1 which defines that all authorities of the
state(s) help each other on request.]
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The format isn't too hard to get right, but it gets funny with multiline
fields (which we don't really have yet) and its just easier to deal with
it once and for all which can be reused for more messages later.
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Commit 89c4c588b275 ("fix from David Kalnischkies for the InRelease gpg
verification code (LP: #784473)") amended verification of cleartext
signatures by a check whether the file to be verified actually starts
with "-----BEGIN PGP SIGNATURE-----\n".
However cleartext signed InRelease files have been found in the wild
which use \r\n as line ending for this armor header line, presumably
generated by a Windows PGP client. Such files are incorrectly deemed
unsigned and result in the following (misleading) error:
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
RFC 4880 specifies in 6.2 Forming ASCII Armor:
That is to say, there is always a line ending preceding the
starting five dashes, and following the ending five dashes. The
header lines, therefore, MUST start at the beginning of a line, and
MUST NOT have text other than whitespace following them on the same
line.
RFC 4880 does not seem to specify whether LF or CRLF is used as line
ending for armor headers, but CR is generally considered whitespace
(e.g. "man perlrecharclass"), hence using CRLF is legal even under
the assumption that LF must be used.
SplitClearSignedFile() is stripping whitespace (including CR) on lineend
already before matching the string, so StartsWithGPGClearTextSignature() is
adapted to use the same ignoring. As the earlier method is responsible
for what apt will end up actually parsing nowadays as signed/unsigned this
change has no implications for security.
Thanks: Lukas Wunner for detailed report & initial patch!
References: 89c4c588b275d098af33f36eeddea6fd75068342
Closes: 884922
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If the cache needs to grow to make room to insert volatile files like
deb files into the cache we were remapping null-pointers making them
non-null-pointers in the process causing trouble later on.
Only the current Releasefile pointer can currently legally be a
nullpointer as volatile files have no release file they belong to, but
for safety the pointer to the current Packages file is equally guarded.
The option APT::Cache-Start can be used to workaround this problem.
Reported-By: Mattia Rizzolo on IRC
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Earlier gcc versions used to complain that you should add them althrough
there isn't a lot of point to it if you think about it, but now gcc (>= 8)
complains about the attribute being present.
warning: ‘pure’ attribute on function returning ‘void’ [-Wattributes]
Reported-By: gcc -Wattributes
Gbp-Dch: Ignore
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For deb files we always supported falling back from one server to the
other if one failed to download the deb, but that was hardwired in the
handling of this specific item. Moving this alongside the retry
infrastructure we can implement it for all items and allow methods to
use this as well by providing additional URIs in a redirect.
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We have quite a bit of metadata available for the files we acquire, but
the methods weren't told about it and got just the URI. That is indeed
fine for most, but to avoid methods trying to parse the metadata out of
the provided URIs (and fail horribly in edgecases) we can just as well
be nice and tell them stuff directly.
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Moving the Retry-implementation from individual items to the worker
implementation not only gives every file retry capability instead of
just a selected few but also avoids needing to implement it in each item
(incorrectly).
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LookupTag is a little helper to deal with rfc822-style strings we use in
apt e.g. to pass acquire messages around for cases in which our usual
rfc822 parser is too heavy. All the fields it had to deal with so far
were single line, but if they aren't it should really produce the right
output and not just return the first line. Error messages are a prime
candidate for becoming multiline as at the moment they are stripped of
potential newlines due to the previous insufficiency of LookupTag.
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We have no speed problem with handling floats/doubles in our progress
handling, but that shouldn't prevent us from cleaning up the handling
slightly to avoid unclean casting to ints.
Reported-By: gcc -Wdouble-promotion -Wold-style-cast
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The casts are useless, but the reports show some where we can actually
improve the code by replacing them with better alternatives like
converting whatever int type into a string instead of casting to a
specific one which might in the future be too small.
Reported-By: gcc -Wuseless-cast
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gcc was warning about ignored type qualifiers for all of them due to the
last 'const', so dropping that and converting to static_cast in the
process removes the here harmless warning to avoid hidden real issues in
them later on.
Reported-By: gcc
Gbp-Dch: Ignore
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gcc has problems understanding this construct and additionally thinks it
would produce multiple lines and stuff, so to keep using it isn't really
worth it for the few instances we have: We can just write the long form
there which works better.
Reported-By: gcc
Gbp-Dch: Ignore
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Mostly harmless as it just means that apt thinks that the dpkg
commandline it is building is slightly longer than it actually is and we
have various ways of avoiding generating very long lines nowadays, but
calculating the right value can't hurt.
Reported-By: gcc -Wmultistatement-macros
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Reported-By: gcc -Wsign-promo
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If we perform candidate switching in requests like "apt install foo/bar"
we should first check if the dependencies of foo from release bar are
already satisfied by what is already installed before checking if the
candidate (or switched candidate) would.
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If a InRelease file fails to download with a non-404 error
we assumed there is some general problem with repository like
a webportal or your are blocked from access (wrong auth, Tor, …).
Turns out some server like S3 return 403 if a file doesn't exist.
Allowing this in general seems like a step backwards as 403 is a
reasonable response if auth failed, so failing here seems better
than letting those users run into problems.
What we can do is show our insecure warnings through and allow the
failures for insecure repos: If the repo is signed it is easy to add
an InRelease file and if not you are setup for trouble anyhow.
References: cbbf185c3c55effe47f218a07e7b1f324973a8a6
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The documentation said "spaces", but there is no real reason to be so
strict and only allow spaces to separate values as that only leads to
very long lines if e.g. multiple URIs are specified which are again hard
to deal with from a user PoV which the deb822 format is supposed to
avoid. It also deals with multiple consecutive spaces and strange things
like tabs users will surely end up using in the real world.
The old behviour on encountering folded lines is the generation of URIs
which end up containing all these whitespace characters which tends to
mess really bad with output and further processing.
Closes: 881875
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Regression-Of: cc1f94c95373670fdfdb8e2d6cf9125181f7df0c
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We would like to issue a warning about seccomp support in
Configuration(), but since the queue is empty, there is no
current item to show the URL for and we get a segfault. Show
the protocol instead.
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The previous change moved running the proxy detection program from the
method to the main process, so it runs as root and not as _apt. This
brings it back into the sandbox.
Gbp-Dch: ignore
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This avoids running the Proxy-Auto-Detect script inside the
untrusted (well, less trusted for now) sandbox. This will allow
us to restrict the http method from fork()ing or exec()ing via
seccomp.
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tagfile-order.c: Add missing fields from dpkg 1.19
For binary packages, this is Build-Essential; for source packages,
it is Description.
test-bug-718329-...: Ignore control.tar.*, changes in dpkg 1.19
test-apt-extracttemplates: Fix for dpkg 1.19
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This isn't really used by the acquire system at all at the moment and
the only method potentially sending this information is file://, but
that used to be working correctly before broken in 2013, so better fix
it now and worry about maybe using the data some day later.
Regression-Of: b3501edb7091ca3aa6c2d6d96dc667b8161dd2b9
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Using hardcoded array-indexes in the build-dependency parsing is
efficient, but less discoverable and easier to break. We can avoid
this by making it even more efficient (not that it would be noticeable)
allowing us to do explicitly named comparisons instead.
Gbp-Dch: Ignore
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APT used to parse only wellformed files produced by repository creation
tools which removed empty files as pointless before apt would see them.
Now that apt can be told to parse e.g. debian/control files directly, it
needs to be a little more accepting through: We had this with comments
already, now let it deal with the far more trivial empty fields.
Closes: #875363
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In commit Do not warn about duplicate "legacy" targets, we
we added an if, that changed the .po files...
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When udev is not available, the variables for libraries and
include paths are set to NOTFOUND rather than an empty string
and CMake exits with an error. Use a generator expression to
only use these variables when UDEV_FOUND is true.
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We previously dlopen()ed it, but it seems painful to do that
without any real gain, except for possibly not having libudev
in the address space and not having code #ifdefed for Linux.
The latter means that we are a bit more likely to break stuff
for non-Linux systems now if we play with udev, but at least
we don't end up with it silently breaking because of a libudev
ABI break.
The existing function pointers in the struct were renamed and
kept for compat purposes.
Fixes Debian/apt#48
Also adjust prepare-release to strip [linux-any] from build-depends
for travis.
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This fails if no Files field exists anymore, for example, because
the Sources index only contains SHA256 hashes. Instead check all
hashes.
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