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This allows third-party package managers like snap or flatpak
to hook in and suggest alternatives if packages could not be
found, for example.
This is still highly experimental and the protocol might change
in future versions.
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We just enabled https on changelogs.ubuntu.com, let's use it.
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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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The testpackages hardly need debhelper at all, so any version would do,
and they build without root rights by definition, but declaring it
explicitly can't hurt and in the case of debhelper it would be sad if
our testcases break one day because the old compat level is removed.
Gbp-Dch: Ignore
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This fixes a test failure on autopkgtest.
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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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Gbp-Dch: Ignore
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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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For the failure propagation testing we try to connect to a port which
isn't open – you would think that this has a rather limited set of
failure modes but it turns out that there are various ways this can
fail, so instead of trying to guess all error message we just accept
any.
Reported-By: travis-ci
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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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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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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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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We did not strip away profiling messages when we were diffing
from stdin (-). Just always write temporary files and strip from
them.
We also had a problem when stripping ...profiling: from a line
and the next line starts with profiling. Split the sed into two
calls so we first remove complete profiling: lines before fixing
the ...profiling: cases.
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apt usually gets the width of the window from the terminal or failing
that has a default value, but especially for testing it can be handy
to control the size as you can't be sure that variable sized content
will always be linebreaked as expected in the testcases.
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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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Installed-Size for linux-image-4.13.0-1-amd64-dbg and friends
are larger than 4 GB, but read as a signed integer - that's
fine so far, as the value is in KB, but it's multiplied with
1024 which overflows. So let's read it as unsigned long long
instead.
While we're at it, also use unsigned long long for Size, in
case that is bigger than 2 GB.
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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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A va_copy call needs to be closed in all branches with va_end, so these
functions would need to be reworked slightly, but we don't actually need
to copy the va_list as we don't work on it, we just push it forward, so
dropping the copy and everyone is happy.
Reported-By: cppcheck
Gbp-Dch: Ignore
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gpg2 generates keyboxes by default and users end up putting either those
or armored files into the trusted.gpg.d directory which apt tools
neither expect nor can really work with without fortifying backward
compatibility (at least under the ".gpg" extension).
A (short) discussion about how to deal with keyboxes happened in
https://lists.debian.org/deity/2017/07/msg00083.html
As the last message in that thread is this changeset lets go ahead
with it and see how it turns out.
The idea is here simply that we check the first octal of a gpg file to
have one of three accepted values. Testing on my machines has always
produced just one of these, but running into those values on invalid
files is reasonabily unlikely to not worry too much.
Closes: #876508
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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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APT connects just fine to any .onion address given, only if the connect
fails somehow it will perform checks on the sanity of which in this case
is checking the length as they are well defined and as the strings are
arbitrary a user typing them easily mistypes which apt should can be
slightly more helpful in figuring out by saying the onion hasn't the
required length.
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This automatically removes any old apt-transport-https, as
apt now Breaks it unversioned.
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When writing a Sources files hashes that were already present
in the .dsc were always copied through (or modified), even if
disabled. Remove them instead when they are disabled, otherwise
we end up with hashes for tarballs and stuff but not for dsc
files (as the dsc obviously does not hash itself).
Also adjust the tests: test-compressed-indexes relied on Files
being present in showsrc, and test-apt-update-weak-hashes expected
the tarball to be downloaded when an archive only has MD5 and we
are requiring SHA256 because that used to work because the tarball
was always included.
Closes: #872963
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Commit e250a8d8d8ef2f8f8c5e2041f7645c49fba7aa36 implemented the fix and
should have included already this testcase for it.
Gbp-Dch: Ignore
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gpgv: WARNING: This key is not suitable for signing in --compliance=gnupg mode
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It was broken because apt.conf.d was not readable, but that's
where the architecture is defined...
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This caused a build failure in the test suite.
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If 'apt-ftparchive packages /path/to/files/' (or sources) is used the
files to include in the generated index (on stdout) were included in the
order in which they were discovered, which isn't a very stable order
which could lead to indexes changing without actually changing content
causing needless changes in the repository changing hashsums, pdiffs,
rsyncs, downloads, ….
This does not effect apt-ftparchive calls which already have an order
defined via a filelist (like generate) which will still print in the
order given by the filelist.
Note that a similar effect can be achieved by post-processing index
files with apt-sortpkgs.
Closes: 869557
Thanks: Chris Lamb for initial patch & Stefan Lippers-Hollmann for testing
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The feature exists for a long while even if we get around to document
it properly only now, so we should push for its adoption a bit to avoid
the problems its supposed to solve like avoiding usage of non-world
readable configuration files as they can cause strange behaviour for the
unsuspecting user (like different solutions as root and non-root).
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We detect the effected sources by matching Release info – that has
potential by-catch of repositories which have incorrect field values,
but those are better fixed now anyhow. The bigger incorrectness is that
this message will not only be printed for the Debian services itself but
also for all mirrors not under Debian control but serving Debian like more
local/private mirrors which will not (directly) shutdown. It is likely
through that many of them will follow suite with less visible
announcements or break downright if their upstream source disappears, so
having false-positives here seems benefitial for the user in the end.
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On HTTP Connect we since recently look into the auth.conf file for login
information, so we should really look for all proxies into the file as
the argument is the same as for sources entries and it is easier to
document (especially as the manpage already mentions it as supported).
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We have support for an netrc-like auth.conf file since 0.7.25 (closing
518473), but it was never documented in apt that it even exists and
netrc seems to have fallen out of usage as a manpage for it no longer
exists making the feature even more arcane.
On top of that the code was a bit of a mess (as it is written in c-style)
and as a result the matching of machine tokens to URIs also a bit
strange by checking for less specific matches (= without path) first.
We now do a single pass over the stanzas.
In practice early adopters of the undocumented implementation will not
really notice the differences and the 'new' behaviour is simpler to
document and more usual for an apt user.
Closes: #811181
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We used to fail on unreadable config/preferences/sources files, but at
least for sources we didn't in the past and it seems harsh to refuse to
work because of a single file, especially as the error messages are
inconsistent and end up being silly (like suggesting to run apt update
to fix the problem…).
LP: #1701852
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Using different ways of opening files means we have different behaviour
and error messages for them, so by the same for all we can have more
uniformity for users and apt developers alike.
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Failing on too much data is good, but we can do better by checking for
exact filesizes as we know with hashsums how large a file should be, so
if we get a file which has a size we do not expect we can drop it
directly, regardless of if the file is larger or smaller than what we
expect which should catch most cases which would end up as hashsum
errors later now a lot sooner.
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We tend to operate on rather large static files, which means we usually
get Content-Length information from the server. If we combine this
information with the filesize we are expecting (factoring in pipelining)
we can avoid reading a bunch of data we are ending up rejecting anyhow
by just closing the connection saving bandwidth and time both for the
server as well as the client.
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It is highly unlikely to encounter fields which start with HTTP in
practice, but we should really be a bit more restrictive here.
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The comment says this is intended, but looking at the history reveals
that the comment comes from a different era. Nowadays we don't really
need it anymore (and even back then it was disputeable) as we haven't
used that file for our update in the end and nothing really needs this
file after the update.
Triggered is this by 188f297a2af4c15cb1d502360d1e478644b5b810 which
moves various error conditions forward including this code expecting the
file to exist – but it doesn't need to as download could have failed.
We could fix that by simple checking if the file exists and only stage
it if it does, but instead we don't stage it and instead even rename it
out of the way with our conventional FAILED name (if it exists).
That restores support for partial mirrors (= in this case mirrors which
don't ship pdiff files). Note that apt heals itself even if only such a
mirror is used as the update is successful even if that error is shown.
Closes: 869425
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This makes the code easier to read.
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