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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
2019-02-01Drop buffered writing from clearsigned message extractionDavid Kalnischkies
It is dropped in the merged code, but the extraction of the clearsigned message code was the only one who had it previously, so the short-desc explains the change from a before-after merge of the branch PoV. It would make sense to enable it, but as we aren't in a time critical paths here we can delay this for after buster to avoid problems. References: 73e3459689c05cd62f15c29d2faddb0fc215ef5e Suggested-By: Julian Andres Klode
2019-02-01Avoid boolean flags by splitting writeTo functionsDavid Kalnischkies
Suggested-By: Julian Andres Klode Gbp-Dch: Ignore
2019-01-31Merge branch 'pu/verify-method-messages-2' into 'master'Julian Andres Klode
Verify data being sent by methods in SendMessage() See merge request apt-team/apt!48
2019-01-31Disable deprecated methods (ftp, rsh, ssh) by defaultJulian Andres Klode
These methods are not supposed to be used anymore, they are not actively maintained and may hence contain odd bugs. Fixes !49
2019-01-30Verify data being sent by methods in SendMessage()Julian Andres Klode
As a follow-up for CVE-2019-3462, add checks similar to those for redirect to the central SendMessage() function. The checks are a bit more relaxed for values - they may include newlines and unicode characters (newlines get rewritten, so are safe). For keys and the message header, the checks are far more strict: They may only contain alphanumerical characters, the hyphen-minus, and the horizontal space. In case the method tries to send anything else, we construct a legal 400 URI Failed response, and send that. We specifically do not include the item URI, in case it has been compromised (that would cause infinite recursion).
2019-01-29Reuse APT::StringView more in LineBufferDavid Kalnischkies
No effective change in behaviour, just simplifying and reusing code. Suggested-By: Julian Andres Klode Gbp-Dch: Ignore
2019-01-29Rework ifs to use not instead of == false/trueDavid Kalnischkies
No change in the logic itself, just dropping "== true", replacing "== false" with not and moving lines around to make branches more obvious. Suggested-By: Julian Andres Klode Gbp-Dch: Ignore
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.
2019-01-28Use more abstraction to handle the current line bufferDavid Kalnischkies
This is C++, so we can use a bit more abstraction to let the code look a tiny bit nicer hopefully improving readability a bit. Gbp-Dch: Ignore
2019-01-28Explicitly remove the whitespaces defined by RFCDavid Kalnischkies
RFC 4880 section 7.1 "Dash-Escaped Text" at the end defines that only space and tab are allowed, so we should remove only these even if due to use complaining (or now failing) you can't really make use of it. Note that strrstrip was removing '\r\n\t ', not other whitespaces like \v or \f and another big reason to do it explicitly here now is to avoid that a future change adding those could have unintended consequences.
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.
2019-01-22Remove `register` keywordKhem Raj
In C++17 `register` keyword was removed. Current gcc 8.1.0 produces following warning if `-std=c++17` flag is used: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister] GCC almost completely ignores `register` keyword, with rare exception of `-O0` when additional copy from/to stack may be generated. For simplicity of the codebase it is better to just remove this problematic keyword where it is not strictly required. See: http://en.cppreference.com/w/cpp/language/storage_duration Signed-off-by: Khem Raj <raj.khem@gmail.com>
2019-01-05hash32: Tighten to multiversion to x86-64 ELF and use uint32_tJulian Andres Klode
2018-12-26debListParser: Avoid native arch lookup in ParseDependsJulian Andres Klode
We called low-level ParseDepends without an architecture each time, which means each call looked up the native architecture. Store the native architecture in the class and use that when calling low-level ParseDepends from the high-level ParseDepends(). This improves performance for a cache build from 2.7 to 2.5 seconds for me. Also avoid a call when stripping multiarch, as the native architecture is passed in.
2018-12-26configuration: Compare size first during lookupJulian Andres Klode
2018-12-26cache hash: Use sse4.2 CRC32c on x86-64 where availableJulian Andres Klode
This is more than twice as fast as adler32, but could be made another 50% faster by calculating crcs for 8 byte blocks in "parallel" (without data dependency) and then combining them. But that's complicated code. Reference measurements for hashing the cache 100 times: adler32=2.46s xxhash64=0.64 xxhash32=1.12 crc32c(this)=1.10 crc32c(opt)=0.44s
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.
2018-12-04Override FileFd copy constructor to prevent copyingJulian Andres Klode
FileFd could be copied using the default copy constructor, which does not work, and then causes code to crash.
2018-12-04Merge branch 'bugfix/spaceinconfig' into 'master'Julian Andres Klode
Use quoted tagnames in config dumps See merge request apt-team/apt!32
2018-12-04Merge branch 'remove_old_derivatives' into 'master'Julian Andres Klode
Remove old derivatives See merge request apt-team/apt!31
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
2018-10-30Fix typos encountered while updating de translationChris Leick
2018-10-26Remove "Tanglu" config for Acquire::Changelogs and as vendorManuel A. Fernandez Montecelo
This is an inactive derivative according to the census, and all the URLs which are part of tanglu.org are dead.
2018-10-26Remove "Ultimedia" config for Acquire::ChangelogsManuel A. Fernandez Montecelo
This is an inactive derivative according to the census, and all the URLs which are part of .ultimediaos.com are dead.
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
2018-09-24pkgCacheFile: 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.
2018-09-11Support 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.
2018-09-11Process 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.