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This fixes a security issue that can be exploited to inject arbritrary debs
or other files into a signed repository as followed:
(1) Server sends a redirect to somewhere%0a<headers for the apt method> (where %0a is
\n encoded)
(2) apt method decodes the redirect (because the method encodes the URLs before
sending them out), writting something like
somewhere\n
<headers>
into its output
(3) apt then uses the headers injected for validation purposes.
Our test webserver does not support the necessary bits in this version that
we used in newer versions, so no testing script is provided.
Regression-Of: c34ea12ad509cb34c954ed574a301c3cbede55ec
LP: #1812353
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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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I should have tested this before pushing it to git.debian.org,
but accidentally did not.
Gbp-Dch: ignore
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Dynamically allocate KillList in order to avoid an overflow when
more than 100 elements would be written to it.
This happened while playing around with the status file from
Bug#701069 on a modern system.
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This should make things even more predictable.
Gbp-Dch: ignore
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Git-Dch: ignore
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Git-Dch: ignore
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This avoid the large diff we have that is mostly caused by the
line numbers changing in the po/pot files.
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This could allow an attacker to mark a package as installed in a
remote package index, as long as the package was not listed in
the dpkg status file.
This way, an attacker could force the installation of a package
during a dist-upgrade, by providing two packages in an index,
an older marked as installed, and a newer - apt would "upgrade"
to the newer version.
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In 50ef3344c3afaaf9943142906b2f976a0337d264 (and similar for other
branches), while 'fixing' the edgecase of a package being in multiple
sections (e.g. moved from libs to oldlibs in newer releases) I
accidently broke the feature itself completely by operating on the
package itself and no longer on its dependencies…
The behaviour isn't ideal in multiple ways, which we are hopefully able
to fix with new ideas as mentioned in the buglog, but until then the
functionality of this "hack" should be restored.
Reported-By: Raphaël Hertzog <hertzog@debian.org>
Tested-By: Adam Conrad <adconrad@ubuntu.com>
Closes: 793360
LP: 1479207
Thanks: Raphaël Hertzog and Adam Conrad for detailed reports and initial patches
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The siblings of this message are all guarded as debug messages, just this
one had it missing and subsequently causes display issues if triggered,
which, given that clog is an alias for cerr, end up on stderr and
therefore are reported as problems by tools only showing the stderr
like our own cron script.
[Backport of f4c7a238f4c29ac9b1e1172f103ab7dec5c5807d]
Closes: 793444
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Add a regression test that reproduced the hang of apt when a
partial file is present.
Git-Dch: ignore
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The apt http code parses Content-Length and Content-Range. For
both requests the variable "Size" is used and the semantic for
this Size is the total file size. However Content-Length is not
the entire file size for partital file requests. For servers that
send the Content-Range header first and then the Content-Length
header this can lead to globbing of Size so that its less than
the real file size. This may lead to a subsequent passing of a
negative number into the CircleBuf which leads to a endless
loop that writes data.
Thanks to Anton Blanchard for the analysis and initial patch.
LP: #1445239
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The fix for #777760 causes packages of foreign (and the native)
architectures, to be created correctly, but invalidates (like the
previously existing, but policy-forbidden architecture-less packages
we had to support for some upgrade scenarios) the assumption that the
first (and only) package in the cache for a single architecture system
must be the package for the native architecture (as, where should the
other architectures come from, right? Wrong.).
Depending on the order of parsing sources more or less packages can be
effected by this. The effects are strange (for apt it mostly effects
simulation/debug output, but also apt-mark on these specific packages),
which complicates debugging, but relatively harmless if understood as
most actions do not need direct named access to packages.
The problem is fixed by removing the single-arch special casing in the
paths who had them (Cache.FindPkg), so they use the same code as
multi-arch systems, which use them as a wrapper for Grp.FindPkg.
Note that single-arch system code was using Grp.FindPkg before as well
if a Grp structure was handily available, so we don't introduce new
untested code here: We remove more brittle special cases which are less
tested instead (this was planed to be done for Stretch anyhow).
Note further that the method with the assumption itself isn't fixed. As
it is a private method I opted for declaring it deprecated instead and
remove all its call positions. As it is private no-one can call this
method legally (thanks to how c++ works by default its still an exported
symbol through) and fixing it basically means reimplementing code we
already have in Grp.FindPkg.
Removing rather than fixing seems hence like a good solution.
Closes: 782777
Thanks: Axel Beckert for testing
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On single-arch the parsing was creating groupnames like 'apt:amd64' even
through it should be 'apt' and a package in it belonging to architecture
amd64. The result for foreign architectures was as expected: The
dependency isn't satisfiable, but for native architecture it means the
wrong package (ala apt:amd64:amd64) is linked so this is also not
satisfiable, which is very much not expected.
No longer excluding single-arch from this codepath allows the generation
of the correct links, which still link to non-exisiting packages for
foreign dependencies, but natives link to the expected native package
just as if no architecture was given.
For negative arch-specific dependencies ala Conflicts this matter was
worse as apt will believe there isn't a Conflict to resolve, tricking it
into calculating a solution dpkg will refuse.
Architecture specific positive dependencies are rare in jessie – the
only one in amd64 main is foreign –, negative dependencies do not even
exist. Neither class has a native specimen, so no package in jessie is
effected by this bug, but it might be interesting for stretch upgrades.
This also means the regression potential is very low.
Closes: 777760
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gnupg is case-insensitive about keyids, so back then apt-key called it
directly any keyid was accepted, but now that we work more with the
keyid ourself we regressed to require uppercase keyids by accident.
This is also inconsistent with other apt-key commands which still use
gnupg directly. A single case-insensitive grep and we are fine again.
Closes: 781696
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g++-5 generates a slightly broken libapt which doesn't split
architecture configurations correctly resulting in e.g. Packages files
requested for the bogus architecture 'amd64,i386' instead of for amd64
and i386.
The reason is an incorrectly applied attribute marking the function as
const, while functions with pointer arguments are not allowed to be
declared as such (note that char& is a char* in disguise). Demoting the
attribute to pure fixes this issue – better would be dropping the & from
char but that is an API change…
Neither earlier g++ versions nor clang use this attribute to generate
broken code, so we don't need a rebuild of dependencies or anything and
g++-5 isn't even included in jessie, but the effect is so strange and
apt popular enough to consider avoiding this problem anyhow.
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libapt can be configured to write various bits of information to a file
creating a report via apport. This is disabled by default in Debian and
apport residing only in /experimental so far, but Ubuntu and other
derivatives have this (in some versions) enabled by default and there is
no regression potentially here.
The crash is caused by a mismatch of operations vs. strings for
operations, so adding the missing strings for these operations solves
the problem.
[commit message by David Kalnischkies]
LP: #1436626
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In /experimental this is resolved by deprecating Mode and moving to a
new std::string, but that breaks ABI of course, so that was out of
question. We can't change to a malloc/free style c-string either as
Mode is public and hence a library user could be setting this as well.
std::string implementors actually helped us out here with copy-on-write
which means that while the variable "obviously" runs out of scope here,
in reality you get the correct result as the string we work with here
comes from the configuration in which it is still valid. Such a
dependency on magic is bad of course, but its still interesting that
only python3 seems to have an issue with it…
With some silly explicit if-else assigning we can sidestep this issue
while retaining the same output for 99.99% of all users (= noone
actually configures additional compression algorithms which are also
provided by repositories…), but even for these 0.01% its just a small
change in the display as Mode can not be used for anything else.
Example: apt/aptitude uses it in its 'update' implementations in the
one-line progress at the bottom for specific items.
Closes: 781858
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The worker expects that the methods tell him when they start or finish
downloading a file. Various information pieces are passed along in this report
including the (expected) filesize. https is using a "global" struct for
reporting which made it 'reuse' incorrect values in some cases like a
non-existent InRelease fallbacking to Release{,.gpg} resulting in an incorrect
size-mismatch warning scaring and desensitizing users as well as being subject
to a race between the write_data and progress callbacks generating incorrect
progress reporting and potentially the same error message.
Other branches as well as the bugreports contain 'better' fixes making the
struct local and other sensible changes, but are larger as a result, so in
this version we opted for short diff with minimal effect above else instead.
Closes: 777565, 781509
Thanks: Robert Edmonds and Anders Kaseorg for initial patchs
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You would think one instance of this is enough, but
80e8d923ebc8d5f3f84eb3f922b28ca309c25026 wasn't as
globally applied as the commit message suggested…
LP: #1399037
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Do not crash in ServerState::HeaderLine if there is no Owner.
Closes: #778375
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Commit 9ec748ff103840c4c65471ca00d3b72984131ce4 from Feb 23 last year
adds a version check after 8daf68e366fa9fa2794ae667f51562663856237c
added 8 days earlier negative points for breaks/conflicts with the
intended that only dependencies which are satisfied propagate points
(aka: old conflicts do not).
The implementation was needlessly complex and flawed through preventing
positive dependencies from gaining points like they did before these
commits making library transitions harder instead of simpler. It worked
out anyhow most of the time out of pure 'luck' (and other ways of
gaining points) or got miss attributed to being a temporary hick-up.
Closes: 774924
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Your mileage may vary, but don't worry: There is more than one way to
do it, but our one size fits all is not a bigger hammer, but an entire
roundhouse kick! So brace yourself for the tl;dr: The limit is gone.*
Beware: This fixes also the problem that a double newline is
unconditionally added 'later' which is an overcommitment in case
the dsc filesize is limit-2 <= x <= limit.
* limited to numbers fitting into an unsigned long long.
Closes: 774893
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The issue was that https.cc never called URIStart(), one way to
detect this is that no download progress is generated without
this call. The test now checks for this and as a side-effect will
also ensure that we do not break download progress reporting and
Acquire::{http,https}::Dl-Limit accidently.
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Add a explicit ReceivedData to HttpsMethod that indicates when
we got data from the connection so that we can send URISTart()
to the parent.
This is needed because URIStart got moved in f9b4f12d from
the progress_callback to write_data() and it only checks for
Res.Size. In the old code if progress_callback is called by
libcurl (and sets Res.Size) before write_data is called then
URIStart() is never send. Making this a explicit ReceivedData
variable fixes this issue.
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The current filtering matches the names of the image metapackages on the
i386 architecture:
$ dpkg-query -l | awk '/^ii[ ]+(linux|kfreebsd|gnumach)-image-[0-9]/ && $2 !~ /-dbg$/ { print $2 }'
linux-image-3.16.0-4-586
linux-image-586
This results in an extra image package being removed from
APT::NeverAutoRemove, losing the intended effect of keeping the {current,
previous, latest} set of images installed.
Requiring a “.” in the package name tightens the matched package names
to those that are installing a specific version of the image, thus
eliding the meta-packages.
Closes: 772732
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Commit 299aea924ccef428219ed6f1a026c122678429e6 fixes the problem of
not logging terminal in case stdin & stdout are not a terminal. The
problem is that we are then trying to pass-through stdin content by
reading from the apt-process stdin and writing it to the stdin of the
child (dpkg), which works great for users who can control themselves,
but pipes and co are a bit less forgiving causing us to pass everything
to the first child process, which if the sending part of the pipe is
e.g. 'yes' we will never see the end of it (as the pipe is full at some
point and further writing blocks).
There is a simple solution for that of course: If stdin isn't a terminal,
we us the apt-process stdin as stdin for the child directly (We don't do
this if it is a terminal to be able to save the typed input in the log).
Closes: 773061
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dpkg checks now for dependencies before running triggers, so that
packages can now end up in trigger states (especially those we are not
touching at all with our calls) after apt is done running.
The solution to this is trivial: Just tell dpkg to configure everything
after we have (supposely) configured everything already. In the worst
case this means dpkg will have to run a bunch of triggers, usually it
will just do nothing though.
The code to make this happen was already available, so we just flip a
config option here to cause it to be run. This way we can keep
pretending that triggers are an implementation detail of dpkg.
--triggers-only would supposely work as well, but --configure is more
robust in regards to future changes to dpkg and something we will
hopefully make use of in future versions anyway (as it was planed at the
time this and related options were implemented).
Note that dpkg currently has a workaround implemented to allow upgrades
to jessie to be clean, so that the test works before and after. Also
note that test (compared to the one in the bug) drops the await test as
its is considered a loop by dpkg now.
Closes: 769609
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If we have no controlling terminal opening a terminal will make this
terminal our controller, which is a serious problem if this happens to
be the pseudo terminal we created to run dpkg in as we will close this
terminal at the end hanging ourself up in the process…
The offending open is the one we do to have at least one slave fd open
all the time, but for good measure, we apply the flag also to the slave
fd opening in the child process as we set the controlling terminal
explicitely here.
This is a regression from 150bdc9ca5d656f9fba94d37c5f4f183b02bd746 with
the slight twist that this usecase was silently broken before in that it
wasn't logging the output in term.log (as a pseudo terminal wasn't
created).
Closes: 772641
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Real webservers (like apache) actually send an error page with a 416
response, but our client didn't expect it leaving the page on the socket
to be parsed as response for the next request (http) or as file content
(https), which isn't what we want at all… Symptom is a "Bad header line"
as html usually doesn't parse that well to an http-header.
This manifests itself e.g. if we have a complete file (or larger) in
partial/ which isn't discarded by If-Range as the server doesn't support
it (or it is just newer, think: mirror rotation).
It is a sort-of regression of 78c72d0ce22e00b194251445aae306df357d5c1a,
which removed the filesize - 1 trick, but this had its own problems…
To properly test this our webserver gains the ability to reply with
transfer-encoding: chunked as most real webservers will use it to send
the dynamically generated error pages.
(The tests and their binary helpers had to be slightly modified to
apply, but the patch to fix the issue itself is unchanged.)
Closes: 768797
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Closes: 772913
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Closes: 772678
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Closes: 771982
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Closes: 771967
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Closes: 771815
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apt-key given a long keyid reports just "OK" all the time, but doesn't
delete the mentioned key as it doesn't find the key.
Note: In debian/experimental this was closed with
29f1b977100aeb6d6ebd38923eeb7a623e264ffe which just added the testcase
as the rewrite of apt-key had fixed this as well.
Closes: 754436
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