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2019-02-05Add a Packages-Require-Authorization Release file fieldJulian Andres Klode
This new field allows a repository to declare that access to packages requires authorization. The current implementation will set the pin to -32768 if no authorization has been provided in the auth.conf(.d) files. This implementation is suboptimal in two aspects: (1) A repository should behave more like NotSource repositories (2) We only have the host name for the repository, we cannot use paths yet. - We can fix those after an ABI break. The code also adds a check to acquire-item.cc to not use the specified repository as a download source, mimicking NotSource. (cherry picked from commit c2b9b0489538fed4770515bd8853a960b13a2618) LP: #1814727
2019-02-05Introduce experimental 'never' pinning for sourcesJulian Andres Klode
This allows disabling a repository by pinning it to 'never', which is internally translated to a value of -32768 (or whatever the minimum of short is). This overrides any other pin for that repository. It can be used to make sure certain sources are never used; for example, in unattended-upgrades. To prevent semantic changes to existing files, we substitute min + 1 for every pin-priority: <min>. This is a temporary solution, as we are waiting for an ABI break. To add pins with that value, the special Pin-Priority "never" may be used for now. It's unclear if that will persist, or if the interface will change eventually. (cherry picked from commit 8bb2a91a070170d7d8e71206d1c66a26809bdbc3) LP: #1814727
2019-01-25SECURITY UPDATE: content injection in http method (CVE-2019-3462)Julian Andres Klode
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. Regression-Of: c34ea12ad509cb34c954ed574a301c3cbede55ec LP: #1812353
2019-01-14Add support for /etc/apt/auth.conf.d/*.conf (netrcparts)Julian Andres Klode
This allows us to install matching auth files for sources.list.d files, for example; very useful. This converts aptmethod's authfd from one FileFd to a vector of pointers to FileFd, as FileFd cannot be copied, and move operators are hard. (cherry picked from commit bbfcc05c1978decd28df9681fd73e2a7d9a8c2a5) LP: #1811120
2018-10-05Set DPKG_FRONTEND_LOCKED when running {pre,post}-invoke scriptsJulian Andres Klode
Some post-invoke scripts install packages, which fails because the environment variable is not set. This sets the variable for all three kinds of scripts {pre,post-}invoke and pre-install-pkgs, but we will only allow post-invoke at a later time. Gbp-Dch: full
2018-09-24pkgCacheFile: Only unlock in destructor if locked beforeJulian Andres Klode
pkgCacheFile's destructor unlocks the system, which is confusing if you did not open the cachefile with WithLock set. Create a private data instance that holds the value of WithLock. This regression was introduced in commit b2e465d6d32d2dc884f58b94acb7e35f671a87fe: Join with aliencode Author: jgg Date: 2001-02-20 07:03:16 GMT Join with aliencode by replacing a "Lock" member that was only initialized when the lock was taken by calls to Lock, UnLock; with the latter also taking place if the former did not occur. Regression-Of: b2e465d6d32d2dc884f58b94acb7e35f671a87fe LP: #1794053
2018-09-24Fix calculation of elapsed usec in downloadsJulian Andres Klode
A recent change to use chronos inadvertently replaced the difference of new usec - old usec with new sec - old usec, which is obviously wrong.
2018-09-11Reorder progress report messagesDavid Kalnischkies
We are seeing 'processing' messages from dpkg first, so it makes sense to translate them to "Preparing" messages instead of using "Installing" and co to override these shortly after with the "Preparing" messages. The difference isn't all to visible as later messages tend to linger far longer in the display than the ealier ones, but at least in a listing it seems more logical.
2018-09-11Don't expect duplicated dpkg status-fd messagesDavid Kalnischkies
The progress reporting relies on parsing the status reports of dpkg which used to repeat being in the same state multiple times in the same run, but by fixing #365921 it will stop doing so. The problem is in theory just with 'config-files' in case we do purge as this (can) do remove + purge in one step, but we remove this also for the unpack + configure combination althrough we handle these currently in two independent dpkg calls.
2018-09-11Process status-fd completely before finishing dpkg callDavid Kalnischkies
Exiting the processing loop as soon as the dpkg process finishes might leave status-fd lines unprocessed which wasn't much of a problem in the past as the progress would just be slightly off, but now that we us the information also for skipping already done tasks and generate warnings if we didn't see all expected messages we should make sure we seem them all. We still need to exit "early" if dpkg exited unsuccessfully/crashed through as the (remaining) status lines we get could be incomplete.
2018-08-29Fix typos reported by codespell & spellintianDavid Kalnischkies
No user-visible change as it effects mostly code comments and not a single error message, manpage or similar. Reported-By: codespell & spellintian Gbp-Dch: Ignore
2018-08-29Don't use invalid iterator in Fallback-Of handlingDavid Kalnischkies
cppcheck reports: (error) Iterator 't' used after element has been erased. The loop is actually fashioned to deal with this (not in the most efficient way, but in simplest and speed isn't really a concern here) IF this codepath had a "break" at the end… so I added one. Note that the tests aren't failing before (and hopefully after) the change as the undefined behavior we encounter is too stable. Thanks: David Binderman for reporting
2018-08-20clear alternative URIs for mirror:// between steps (CVE-2018-0501)David Kalnischkies
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
2018-08-08Set DPKG_FRONTEND_LOCKED as needed when doing selection changesJulian Andres Klode
We forgot to set the variable for the selection changes. Let's set it for that and some other dpkg calls. Regression-Of: c2c8b4787b0882234ba2772ec7513afbf97b563a
2018-08-07Add support for dpkg frontend lockJulian Andres Klode
The dpkg frontend lock is a lock dpkg tries to acquire except if the frontend already acquires it. This fixes a race condition in the install command where the dpkg lock is not held for a short period of time between different dpkg invocations. For this reason we also define an environment variable DPKG_FRONTEND_LOCKED for dpkg invocations so dpkg knows not to try to acquire the frontend lock because it's held by a parent process. We can set DPKG_FRONTEND_LOCKED only if the frontend lock really is held; that is, if our lock count is greater than 0 - otherwise an apt client not using the LockInner family of functions would run dpkg without the frontend lock set, but with DPKG_FRONTEND_LOCKED set. Such a process has a weaker guarantee: Because dpkg would not lock the frontend lock either, the process is prone to the existing races, and, more importantly, so is a new style process. Closes: #869546 [fixups: fix error messages, add public IsLocked() method, and make {Un,}LockInner return an error on !debSystem]
2018-07-06Use cheaper entropy source for randomizing items to fetchJulian Andres Klode
The random_device fails if not enough entropy is available. We do not need high-quality entropy here, though, so let's switch to a seed based on the current time in nanoseconds, XORed with the PID.
2018-06-13Fix lock counting in debSystemJulian Andres Klode
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.
2018-05-28Use a steady clock source for progress reportingDavid Kalnischkies
Clock changes while apt is running can result in strange reports confusing (and amusing) users. Sadly, to keep the ABI for now the code is a bit more ugly than it would need to be.
2018-05-28Don't show acquire warning for "hidden" componentsDavid Kalnischkies
Commit d7c92411dc1f4c6be098d1425f9c1c075e0c2154 introduced a warning for non-existent files from components not mentioned in Components to hint users at a mispelling or the disappearance of a component. The debian-installer subcomponent isn't actively advertised in the Release file through, so if apt ends up in acquiring a file which doesn't exist for this component (like Translation files) apt would produce a warning: W: Skipping acquire of configured file 'main/debian-installer/i18n/Translation-en' as repository 'http://deb.debian.org/debian buster InRelease' doesn't have the component 'main/debian-installer' (component misspelt in sources.list?) We prevent this in the future by checking if any file exists from this component which results in the warning to be produced still for the intended cases and silence it on the d-i case. This could potentially cause the warning not to be produced in cases it should be if some marginal file remains, but as this message is just a hint and the setup a bit pathological lets ignore it for now. There is also the possibility of having no file present as they would all be 0-length files and being a "hidden" component, but that would be easy to workaround from the repository side and isn't really actively used at the moment in the wild. Closes: #879591
2018-05-24Merge branch 'feature/morevolatilesupport' into 'master'Julian Andres Klode
more volatile: build-dep foo.deb/release & show foo.deb See merge request apt-team/apt!14
2018-05-24Merge branch 'feature/byhashviaalturl' into 'master'Julian Andres Klode
Don't force the same mirror for by-hash URIs See merge request apt-team/apt!15
2018-05-21Increase debug verbosity in `apt-get autoremove`Filipe Brandenburger
When running with Debug::pkgAutoRemove=yes, explain why certain packages are being marked, either because they're marked essential/important or because they match the blacklist from APT::NeverAutoRemove. This should help troubleshoot cases where autoremove is not proposing removal of packages expected to be up for removal. Tested manually with `apt-get autoremove -o Debug::pkgAutoRemove=yes`.
2018-05-11Don't force the same mirror for by-hash URIsDavid Kalnischkies
Downloading from the same mirror we got a Release file from makes sense for non-unique URIs as their content changes between mirror states, but if we ask for an index via by-hash we can be sure that we either get the file we wanted or a 404 for which we can perform a fallback for which allows us to pull indexes from different mirror in parallel.
2018-05-11Handle by-hash URI construction more centrallyDavid Kalnischkies
Individual items shouldn't concern themselves with these alternative locations, we can deal with this more efficiently within the infrastructure created for other alternative URIs now avoiding the need to implement this in each item.
2018-05-11Drop alternative URIs we got a hash-based fail fromDavid Kalnischkies
If we got a file but it produced a hash error, mismatched size or similar we shouldn't fallback to alternative URIs as they likely result in the same error. If we can we should instead use another mirror. We used to be a lot stricter by stopping all trys for this file if we got a non-404 (or a hash-based) failure, but that is too hard as we really want to try other mirrors (if we have them) in the hope that they have the expected and correct files.
2018-05-11Deprectate buggy/incorrect Rls/PkgFile::IsOk methodsDavid Kalnischkies
With the advent of compressed files and especially with in-memory post-processed files the simple assumptions made in IsOk are no longer true. Worse, they are at best duplicates of checks performed by the cache generation (and validation) earlier and isn't used in too many places. It is hence best to simply get right of these calls instead of trying to fix them.
2018-05-11Start pkg records for deb files with dpkg outputDavid Kalnischkies
It is easier to prepend our fields, but that results in confusion for things working on the so generated records as they don't start with the usual "Package" – that shouldn't be a problem in theory, but in practice e.g. "apt-cache show" shows these records directly to the user who will probably be more confused by it than tools.
2018-05-11don't try SRV requests based on IP addressesDavid Kalnischkies
IP addresses are by definition not a domain so in the best case the requests will just fail; we can do better than that on our own.
2018-05-07Remove obsolete RCS keywordsGuillem Jover
Prompted-by: Jakub Wilk <jwilk@debian.org>
2018-05-05Fix various typos reported by spellcheckersDavid Kalnischkies
Reported-By: codespell & spellintian Gbp-Dch: Ignore
2018-05-05Avoid implicitly promotion of float to doubleDavid Kalnischkies
Reported-By: gcc -Wdouble-promotion Gbp-Dch: Ignore
2018-04-20CMake: Fix builds without zstdJulian Andres Klode
Only use zstd defined variables if zstd was found.
2018-04-15Merge branch 'pu/zstd' into 'master'Julian Andres Klode
pu/zstd See merge request apt-team/apt!8
2018-04-13zstd: Implement support for multi-frame filesJulian Andres Klode
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.
2018-04-13Implement compression level handling for zstdJulian Andres Klode
This is a simplified variant of the code for xz, adapted to support multiple digit integers.
2018-04-07fix communication typo in https manpageDavid Kalnischkies
Reported-By: lintian spelling-error-in-manpage
2018-03-19Bump cache major version to allow different 1.5 and 1.6 updatesJulian Andres Klode
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.
2018-03-15Use https for Ubuntu changelogsJulian Andres Klode
We just enabled https on changelogs.ubuntu.com, let's use it.
2018-03-12apt-pkg: Add support for zstdJulian Andres Klode
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.
2018-02-19Merge branch 'pu/not-valid-before' into 'master'Julian Andres Klode
Check that Date of Release file is not in the future See merge request apt-team/apt!3
2018-02-19Check that Date of Release file is not in the futureJulian Andres Klode
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.
2018-02-19ensure correct file permissions for auxfilesDavid Kalnischkies
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
2018-02-19indexcopy: Copy uncompressed indices from cdrom againJulian Andres Klode
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
2018-01-19allow the apt/lists/auxfiles/ directory to be missingDavid Kalnischkies
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
2018-01-17Introduce inrelease-path option for sources.listJulian Andres Klode
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
2018-01-05dpkg status parsing: check if name is valid before useDavid Kalnischkies
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.
2018-01-04simplify translating "lists directory missing" msgDavid Kalnischkies
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
2018-01-03require methods to request AuxRequest capability at startupDavid Kalnischkies
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.
2018-01-03reimplement and simplify mirror:// methodDavid Kalnischkies
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.
2018-01-03allow a method to request auxiliary filesDavid Kalnischkies
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.]