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2020-05-12SECURITY UPDATE: Fix out of bounds read in .ar and .tar implementation ↵Julian Andres Klode
(CVE-2020-3810) When normalizing ar member names by removing trailing whitespace and slashes, an out-out-bound read can be caused if the ar member name consists only of such characters, because the code did not stop at 0, but would wrap around and continue reading from the stack, without any limit. Add a check to abort if we reached the first character in the name, effectively rejecting the use of names consisting just of slashes and spaces. Furthermore, certain error cases in arfile.cc and extracttar.cc have included member names in the output that were not checked at all and might hence not be nul terminated, leading to further out of bound reads. Fixes Debian/apt#111 LP: #1878177
2019-04-02Add test case for local-only packages pinned to neverJulian Andres Klode
Test from the fix for the regression in trusty for LP #1821308.
2019-03-03Add explicit message for unsupported binary signatureDavid Kalnischkies
Verifying the content of Release.gpg made us fail on binary signatures which were never officially supported (apt-secure manpage only documents only the generation of ASCII armored), but silently accepted by gpgv as we passed it on unchecked before. The binary format is complex and is itself split into old and new formats so adding support for this would not only add lots of code but also a good opportunity for bugs and dubious benefit. Reporting this issue explicitly should help repository creators figure out the problem faster than the default NODATA message hinting at captive portals. Given that the binary format has no file magic or any other clear and simple indication that this is a detached signature we guess based on the first two bits only – and by that only supporting the "old" binary format which seems to be the only one generated by gnupg in this case. References: e2965b0b6bdd68ffcad0e06d11755412a7e16e50 Closes: #921685
2019-02-10Fix various typos in the documentationJakub Wilk
2019-02-04Merge branch 'pu/dead-pin' into 'master'Julian Andres Klode
A pin of -32768 overrides any other, disables repo See merge request apt-team/apt!40
2019-02-01Add 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.
2019-02-01Introduce 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.
2019-02-01Merge branch 'pu/refuseunsignedlines' into 'master'Julian Andres Klode
Fail if InRelease or Release.gpg contain unsigned lines See merge request apt-team/apt!45
2019-02-01Step over empty sections in TagFiles with commentsDavid Kalnischkies
Implementing a parser with recursion isn't the best idea, but in practice we should get away with it for the time being to avoid needless codechurn. Closes: #920317 #921037
2019-01-28Refuse files with lines unexpectedly starting with a dashDavid Kalnischkies
We support dash-encoding even if we don't really work with files who would need it as implementations are free to encode every line, but otherwise a line starting with a dash must either be a header we parse explicitly or the file is refused. This is against the RFC which says clients should warn on such files, but given that we aren't expecting any files with dash-started lines to begin with this looks a lot like a we should not continue to touch the file as it smells like an attempt to confuse different parsers by "hiding" headers in-between others. The other slightly more reasonable explanation would be an armor header key starting with a dash, but no existing key does that and it seems unlikely that this could ever happen. Also, it is recommended that clients warn about unknown keys, so new appearance is limited.
2019-01-24Merge and reuse tmp file handling across the boardDavid Kalnischkies
Having many rather similar implementations especially if one is exported while others aren't (and the rest of it not factored out at all) seems suboptimal.
2019-01-23Fail on non-signature lines in Release.gpgDavid Kalnischkies
The exploit for CVE-2019-3462 uses the fact that a Release.gpg file can contain additional content beside the expected detached signature(s). We were passing the file unchecked to gpgv which ignores these extras without complains, so we reuse the same line-reading implementation we use for InRelease splitting to detect if a Release.gpg file contains unexpected data and fail in this case given that we in the previous commit we established that we fail in the similar InRelease case now.
2019-01-23Fail instead of warn for unsigned lines in InReleaseDavid Kalnischkies
The warnings were introduced 2 years ago without any reports from the wild about them actually appearing for anyone, so now seems to be an as good time as any to switch them to errors. This allows rewritting the code by failing earlier instead of trying to keep going which makes the diff a bit hard to follow but should help simplifying reasoning about it. References: 6376dfb8dfb99b9d182c2fb13aa34b2ac89805e3
2019-01-22Merge branch 'pu/gpgvsignedby' into 'master'Julian Andres Klode
Report keys used to sign file from gpgv method to acquire system See merge request apt-team/apt!44
2019-01-22SECURITY 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
2019-01-22Communicate back which key(s) were used for signingDavid Kalnischkies
Telling the acquire system which keys caused the gpgv method to succeed allows us for now just a casual check if the gpgv method really executed catching bugs like CVE-2018-0501, but we will make use of the information for better features in the following commits.
2019-01-22Refactor internal Signers information storage in gpgvDavid Kalnischkies
Having a method take a bunch of string vectors is bad style, so we change this to a wrapping struct and adapt the rest of the code brushing it up slightly in the process, which results even in a slightly "better" debug output, no practical change otherwise. Gbp-Dch: Ignore
2018-12-10Merge branch 'pu/dpkg-path' into 'master'Julian Andres Klode
Set PATH=/usr/sbin:/usr/bin:/sbin:/bin when running dpkg See merge request apt-team/apt!38
2018-12-10Set PATH=/usr/sbin:/usr/bin:/sbin:/bin when running dpkgJulian Andres Klode
This avoids a lot of problems from local installations of scripting languages and other stuff in /usr/local for which maintainer scripts are not prepared. [v3: Inherit PATH during tests, check overrides work] [v2: Add testing]
2018-12-04Add 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.
2018-12-04Merge branch 'bugfix/spaceinconfig' into 'master'Julian Andres Klode
Use quoted tagnames in config dumps See merge request apt-team/apt!32
2018-12-03Provide a "autopurge" shortcutJulian Andres Klode
This adds a new "autopurge" command that will is a shortcut for "autoremove --purge" Thanks: Michael Vogt for the initial work
2018-12-03test-pdiff-usage: make transaction failure test case more robustJulian Andres Klode
Try 10 times in a row
2018-11-29Use quoted tagnames in config dumpsDavid Kalnischkies
Tagnames in configuration can include spaces (and other nasties) e.g. in repository-specific configuration options due to Origin/Label potentially containing a space. The configuration file format supports parsing quoted as well as encoded spaces, but the output generated by apt-config and other places which might be feedback into apt via parsing (e.g. before calling apt-key in our gpgv method) do not quote and hence produce invalid configuration files. Changing the default to be an encoded tagname ensures that the output of dump can be used as a config file, but other users might not expect this so that is technically a backward-breaking change.
2018-11-25Fix typo reported by codespell in code commentsDavid Kalnischkies
No user visible change expect for some years old changelog entries, so we don't really need to add a new one for this… Reported-By: codespell Gbp-Dch: Ignore
2018-11-25Allow to override the directory of a request in aptwebserverDavid Kalnischkies
The filename can be overridden, but sometimes it is useful to do it only for the directory-part of the filename – e.g. if you want to let a flat archive directory (like /var/cache/apt/archives) serve a pool-based request like /pool/a/apt_version.deb. Gbp-Dch: Ignore
2018-11-25aptwebserver: Prevent XSS in debug and file listingDavid Kalnischkies
We sometimes autogenerate HTML pages e.g. for listing files in a directory or for various error codes. If this would be a serious webserver this would be a security problem (althrough a bit hard to exploit), but as it is not shipped and intended to be used by our testcases only the world hasn't ended &amp; we can ignore it for changelog and fix it for brownie points. Gbp-Dch: Ignore
2018-11-25aptwebserver: Guess Content-Type from filename extensionDavid Kalnischkies
Browsing pages served via aptwebserver is working better if we tell the browser the Content-Type which for this simple usecase we can just do by guessing based on the file extension – and because hardcoding a list would be boring we just reuse the mime.types data from mime-support if available and allow it to be overridden by files and config. Gbp-Dch: Ignore
2018-11-21Print useful error on "apt changelog" without argumentsJulian Andres Klode
Fixes Debian/apt#77
2018-10-14Merge branch 'feature/subkeys' into 'master'Julian Andres Klode
Support subkeys and multiple keyrings in Signed-By options See merge request apt-team/apt!27
2018-10-13Default to https: scheme for fetching Debian changelogsBen Hutchings
Closes: #910941
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
2018-09-20Deal with descriptions embedded in displayed record correctlyDavid Kalnischkies
The implementation of "apt-cache show" (not "apt show") incorrectly resets the currently used parser if the record itself and the description to show come from the same file (as it is the case if no Translation-* files are available e.g. after debootstrap). The code is more complex than you would hope to support some rather unusual setups involving Descriptions and their translations as tested for by ./test-bug-712435-missing-descriptions as otherwise this could be a one-line change. Regression-Of: bf53f39c9a0221b670ffff74053ed36fc502d5a0 Closes: #909155
2018-09-18Merge branch 'bugfix/statusfd' into 'master'Julian Andres Klode
Process all of --status-fd and don't expect duplicate status msg See merge request apt-team/apt!26
2018-09-15Show all architectures in 'apt list' outputDavid Kalnischkies
The uniqueness in std::set containers is ensured by the ordering operator we provide, but it was not considering that different versions can have the same description like the different architectures for a version of a package. Closes: #908218
2018-09-11Support multiple keyrings in sources.list Signed-ByDavid Kalnischkies
A user can specify multiple fingerprints for a while now, so its seems counter-intuitive to support only one keyring, especially if this isn't really checked or enforced and while unlikely mixtures of both should work properly, too, instead of a kinda random behaviour.
2018-09-11Support subkeys properly in Signed-By optionsDavid Kalnischkies
If we limit a file to be signed by a certain key it should usually accept also being signed by any of this keys subkeys instead of requiring each subkey to be listed explicitly. If the later is really wanted we support now also the same syntax as gpg does with appending an exclamation mark at the end of the fingerprint to force no mapping.
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.
2018-09-11Unset more environment variables in test frameworkDavid Kalnischkies
It is an uphill battle to "reset" the environment to a clean state without making it needlessly hard to use 'good' environment variables, so we just try a little harder here without really trying for completeness. Gbp-Dch: Ignore
2018-09-10Don't use gpg directly in apt-key testDavid Kalnischkies
Reported-By: Guillem Jover <guillem@debian.org> Gbp-Dch: Ignore
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
2018-08-19Report (soon) worthless keys if gpg uses fpr for GOODSIGDavid Kalnischkies
gpgs DETAILS documentation file declares that GOODSIG could report keyid or fingerprint since gpg2, but for the time being it is still keyid only. Who knows if that will ever change as that feels like an interface break with dangerous security implications, but lets be better safe than sorry especially as the code dealing with signed-by keyids is prepared for this already. This code is rewritten still to have them all use the same code for this type of problem.
2018-08-19test: Supports records larger than 32kb in 'apt show'David Kalnischkies
The 1.7 series rework of show started in bf53f39c9a0221b670ffff74053ed36fc502d5a0 resolved the issue already, but its always a good idea to at least bring the tests along so that we hopeful do not regress in the future with another rewrite. Tests: #905527 Gbp-Dch: Ignore
2018-08-19aptwebserver: Prefetch compressors to avoid thread crashesDavid Kalnischkies
If multiple threads act on requests (like if connection comes from a webbrowser) a thread might request the supported compressors while another thread is still working on creating the list to be stored in the static cache variable. As the price to pay for atomic and co seems to high for the fringe usecase of manual usage of aptwebserver the patch just makes a call to generate the list while still single threaded. Gbp-Dch: Ignore
2018-08-14CMake: Use ${PROJECT_NAME} instead of hardcoding aptDavid Kalnischkies
Completely pointless as it makes no difference for apt, but copying the file to other projects becomes a lot easier. Gbp-Dch: Ignore
2018-06-27Handle JSON hooks that just close the file/exit and fix some other errorsJulian Andres Klode
JSON hooks might disappear and the common idiom to work around hooks disappearing is to check for the hook in the shell snippet that is in the apt.conf file and if it does not exist, do nothing. This caused APT to fail however, expecting it to acknowledge the handshake. Ignoring ECONNRESET on handshakes solves the problem. The error case, and the other error cases also did not stop execution of the hook, causing more errors to pile up. Fix this by directly going to the closing part of the code. LP: #1776218
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