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2017-02-22add TMP/TEMP/TEMPDIR to the TMPDIR DropPrivileges danceDavid Kalnischkies
apt tools do not really support these other variables, but tools apt calls might, so lets play save and clean those up as needed. Reported-By: Paul Wise (pabs) on IRC (cherry picked from commit e2c8c825a5470e33c25d00e07de188d0e03922c8)
2017-02-22reset HOME, USER(NAME), TMPDIR & SHELL in DropPrivilegesDavid Kalnischkies
We can't cleanup the environment like e.g. sudo would do as you usually want the environment to "leak" into these helpers, but some variables like HOME should really not have still the value of the root user – it could confuse the helpers (USER) and HOME isn't accessible anyhow. Closes: 842877 (cherry picked from commit 34b491e735ad47c4805e63f3b83a659b8d10262b)
2016-12-08gpgv: Flush the files before checking for errorsJulian Andres Klode
This is a follow up to the previous issue where we did not check if getline() returned -1 due to an end of file or due to an error like memory allocation, treating both as end of file. Here we ensure that we also handle buffered writes correctly by flushing the files before checking for any errors in our error stack. Buffered writes themselves were introduced in 1.1.9, but the function was never called with a buffered file from inside apt until commit 46c4043d741cb2c1d54e7f5bfaa234f1b7580f6c which was first released with apt 1.2.10. The function is public, though, so fixing this is a good idea anyway. Affected: >= 1.1.9 (cherry picked from commit 6212ee84a517ed68217429022bd45c108ecf9f85)
2016-12-08SECURITY UPDATE: gpgv: Check for errors when splitting files (CVE-2016-1252)Julian Andres Klode
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)
2016-10-04Do not read stderr from proxy autodetection scriptsJulian Andres Klode
This fixes a regression introduced in commit 8f858d560e3b7b475c623c4e242d1edce246025a don't leak FD in AutoProxyDetect command return parsing which accidentally made the proxy autodetection code also read the scripts output on stderr, not only on stdout when it switched the code from popen() to Popen(). Reported-By: Tim Small <tim@seoss.co.uk>
2016-09-01try not to call memcpy with length 0 in hash calculationsDavid Kalnischkies
memcpy is marked as nonnull for its input, but ignores the input anyhow if the declared length is zero. Our SHA2 implementations do this as well, it was "just" MD5 and SHA1 missing, so we add the length check here as well as along the callstack as it is really pointless to do all these method calls for "nothing". Reported-By: gcc -fsanitize=undefined
2016-08-31Base256ToNum: Fix uninitialized valueJulian Andres Klode
If the inner Base256ToNum() returned false, it did not set Num to a new value, causing it to be uninitialized, and thus might have caused the function to exit despite a good result. Also document why the Res = Num, if (Res != Num) magic is done. Reported-By: valgrind
2016-08-26Make directory paths configurableJulian Andres Klode
This allows other vendors to use different paths, or to build your own APT in /opt for testing. Note that this uses + 1 in some places, as the paths we receive are absolute, but we need to strip of the initial /.
2016-08-26Use C locale instead of C.UTF-8 for protocol stringsJulian Andres Klode
The C.UTF-8 locale is not portable, so we need to use C, otherwise we crash on other systems. We can use std::locale::classic() for that, which might also be a bit cheaper than using locale("C").
2016-08-26Add missing includes and external definitionsJulian Andres Klode
Several modules use std::array without including the array header. Bad modules. Some modules use STDOUT_FILENO and friends, or close() without including unistd.h, where they are defined. One module also uses WIFEXITED() without including sys/wait.h. Finally, environ is not specified to be defined in unistd.h. We are required to define it ourselves according to POSIX, so let's do that.
2016-08-12drop incorrect const attribute from DirectoryExistsDavid Kalnischkies
Since its existence in 2010 DirectoryExists was always marked with this attribute, but for no real reason. Arguably a check for the existence of the file is not modifying global state, so theoretically this shouldn't be a problem. It is wrong from a logical point of view through as between two calls the directory could be created so the promise we made to the compiler that it could remove the second call would be wrong, so API wise it is wrong. It's a bit mysterious that this is only observeable on ppc64el and can be fixed by reordering code ever so slightly, but in the end its more our fault for adding this attribute than the compilers fault for doing something silly based on the attribute. LP: 1473674
2016-08-12fileutl: empty file support: Avoid fstat() on -1 fd and check resultJulian Andres Klode
When checking if a file is empty, we forget to check that fstat() actually worked.
2016-08-12ensure a good clock() value for usage and testsDavid Kalnischkies
We use clock() as a very cheap way of getting a "random" value, but the manpage warns that this could return -1, so we should be dealing with this. Additionally, e.g. on hurd-i386 the value increases only slowly – to slow for our fast running tests for randomness hence producing the same range in both samples, so we introduce a simple busy-wait loop (as clock is counting processor time used by the program) in the test which delays the second sample just enough making our randomness a bit more predictable.
2016-08-11Merge branch 'feature/methods'David Kalnischkies
2016-08-10allow user@host (aka: no password) in URI parsingDavid Kalnischkies
If the URI had no password the username was ignored
2016-08-10implement socks5h proxy support for http methodDavid Kalnischkies
Socks support is a requested feature in sofar that the internet is actually believing Acquire::socks::Proxy would exist. It doesn't and this commit isn't adding it as that isn't how our configuration works, but it allows Acquire::http::Proxy="socks5h://…". The HTTPS method was changed already to support socks proxies (all versions) via curl. This commit implements only SOCKS5 (RFC1928) with no auth or pass&user auth (RFC1929), but not GSSAPI which is required by the RFC. The 'h' in the protocol name further indicates that DNS resolution is delegated to the socks proxy rather than performed locally. The implementation works and was tested with Tor as socks proxy for which implementing socks5h only can actually be considered a feature. Closes: 744934
2016-08-03ExecGPGV: Pass current config state to apt-key via temp fileJulian Andres Klode
Create a temporary configuration file with a dump of our configuration and pass that to apt-key. LP: #1607283
2016-08-03ExecGPGV: Fork in all casesJulian Andres Klode
2016-08-03ExecGPGV: Rework file removal on exit()Julian Andres Klode
Create a local exiter object which cleans up files on exit.
2016-08-03gpgv: Unlink the correct temp file in error caseJulian Andres Klode
Previously, when data could be created and sig not, we would unlink sig, not data (and vice versa).
2016-07-29if the FileFd failed already following calls should fail, tooDavid Kalnischkies
There is no point in trying to perform Write/Read on a FileFd which already failed as they aren't going to work as expected, so we should make sure that they fail early on and hard.
2016-07-27(error) va_list 'args' was opened but not closed by va_end()David Kalnischkies
Reported-By: cppcheck Gbp-Dch: Ignore
2016-07-23call flush on the wrapped writebuffered FileFdDavid Kalnischkies
The flush call is a no-op in most FileFd implementations so this isn't as critical as it might sound as the only non-trivial implementation is in the buffered writer, which tends not be used to buffer another buffer…
2016-07-19ensure Cnf::FindFile doesn't return files below /dev/nullDavid Kalnischkies
Very unlikely, but if the parent is /dev/null, the child empty and the grandchild a value we returned /dev/null/value which doesn't exist, so hardly a problem, but for best operability we should be consistent in our work and return /dev/null always.
2016-07-06don't change owner/perms/times through file:// symlinksDavid Kalnischkies
If we have files in partial/ from a previous invocation or similar such those could be symlinks created by file:// sources. The code is expecting only real files through and happily changes owner, modification times and permission on the file the symlink points to which tend to be files we have no business in touching in this way. Permissions of symlinks shouldn't be changed, changing owner is usually pointless to, but just to be sure we pick the easy way out and use lchown, check for symlinks before chmod/utimes. Reported-By: Mattia Rizzolo on IRC
2016-07-05give a descriptive error for pipe tries with 'false'David Kalnischkies
If libapt has builtin support for a compression type it will create a dummy compressor struct with the Binary set to 'false' as it will catch these before using the generic pipe implementation which uses the Binary. The catching happens based on configured Names through, so you can actually force apt to use the external binaries even if it would usually use the builtin support. That logic fails through if you don't happen to have these external binaries installed as it will fallback to calling 'false', which will end in confusing 'Write error's. So, this is again something you only encounter in constructed testing. Gbp-Dch: Ignore
2016-07-02use +0000 instead of UTC by default as timezone in outputDavid Kalnischkies
All apt versions support numeric as well as 3-character timezones just fine and its actually hard to write code which doesn't "accidently" accepts it. So why change? Documenting the Date/Valid-Until fields in the Release file is easy to do in terms of referencing the datetime format used e.g. in the Debian changelogs (policy §4.4). This format specifies only the numeric timezones through, not the nowadays obsolete 3-character ones, so in the interest of least surprise we should use the same format even through it carries a small risk of regression in other clients (which encounter repositories created with apt-ftparchive). In case it is really regressing in practice, the hidden option -o APT::FTPArchive::Release::NumericTimezone=0 can be used to go back to good old UTC as timezone. The EDSP and EIPP protocols use this 'new' format, the text interface used to communicate with the acquire methods does not for compatibility reasons even if none of our methods would be effected and I doubt any other would (in these instances the timezone is 'GMT' as that is what HTTP/1.1 requires). Note that this is only true for apt talking to methods, (libapt-based) methods talking to apt will respond with the 'new' format. It is therefore strongly adviced to support both also in method input.
2016-06-29don't do atomic overrides with failed filesDavid Kalnischkies
We deploy atomic renames for some files, but these renames also happen if something about the file failed which isn't really the point of the exercise… Closes: 828908
2016-06-29Revert "travis: use gcc-5 instead of gcc(-4.8)"David Kalnischkies
This reverts commit 2b8221d66a8284042fc53c7bbb14bb9750e9137f. Avoiding the use of GCC >= 5 stuff lets use go back to 4.8 simplifying the travis setup again as well as reducing the backport requirements in general. This is possible because the std::get_time use requiring GCC >= 5 in 9febc2b238e1e322dce1f94ecbed46d595893b52 was replaced by handrolling it in 1d742e01470bba27715a8191c50adde4b39c2f19, so the remaining uses are just small conviniences we can do without. Gbp-Dch: Ignore
2016-06-25imbue datetime parsing with C.UTF-8 localeDavid Kalnischkies
Rewritten in 9febc2b238e1e322dce1f94ecbed46d595893b52 for c++ locales usage and rewritten again in 1d742e01470bba27715a8191c50adde4b39c2f19 to avoid a currently present stdlibc++6 bug in the std::get_time implementation. The later implementation uses still stringstreams for parsing, but forgot to explicitly reset the locale to something sane (for parsing english dates that is), so date and especially the parsing of a number is depending on the locale. Turns out, the French (among others) format their numbers with space as thousand separator so for some reason the stdlibc++6 thinks its a good idea to interpret the entire datetime string as a single number instead of realizing that in "25 Jun …" the later parts can't reasonably be part of that number even through there are spaces there… Workaround is hence: LC_NUMERIC=C.UTF-8 Closes: 828011
2016-06-20implement and document DIRECT for auto-detect-proxyDavid Kalnischkies
There is a subtile difference between an empty setting and "DIRECT" in the configuration as the later overrides the generic settings while the earlier does not. Also, non-zero exitcodes should really be reported as an error rather than silently discarded.
2016-06-20do not error if auto-detect-proxy cmd has no outputDavid Kalnischkies
Regression introduced in 8f858d560e3b7b475c623c4e242d1edce246025a. Commands are probably better of always having output through as the fall through to the generic proxy settings is likely not intended. As documenting and implementing this more consistently is kind of a regression through, it is split off into the next commit. Closes: 827713
2016-06-17avoid std::get_time usage to sidestep libstdc++6 bugDavid Kalnischkies
As reported upstream in https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71556 the implementation of std::get_time is currently not as accepting as strptime is, especially in how hours should be formatted. Just reverting 9febc2b238e1e322dce1f94ecbed46d595893b52 would be possible, but then we would reopen the problems fixed by it, so instead I opted here for a rewrite of the parsing logic which makes this method a lot longer, but at least it provides the same benefits as the rewrite in std::get_time was intended to give us and decouples us from the fix of the issue in the standard library implementation of GCC. LP: 1593583
2016-06-14don't use FindFile for external Dir::Bin commandsDavid Kalnischkies
We usually use absolute paths to specific the location of dpkg, apt-key and the like, but there is nothing wrong with using just the command name and instead let exec(3) make the lookup in PATH. We had a wild mixture before, so opting for the more accepting option out of the two seems about right especially as it makes no difference in the default case as apt uses absolute paths.
2016-06-10don't leak FD in AutoProxyDetect command return parsingDavid Kalnischkies
Just closing the fd would be enough, but while we are at it we can also use the Popen interface to have an easier time with this.
2016-06-10don't leak an FD in lz4 (de)compressionDavid Kalnischkies
Seen first in #826783, but as this buglog also shows leaked uncompressed files as well we don't close it just yet.
2016-06-10do not hang on piped input in PipedFileFdPrivateDavid Kalnischkies
This effects only compressors configured on the fly (rather then the inbuilt ones as they use a library).
2016-05-28use de-localed std::put_time instead rolling our ownDavid Kalnischkies
2016-05-28accept only the expected UTC timezones in date parsingDavid Kalnischkies
HTTP/1.1 hardcodes GMT (RFC 7231 §7.1.1.1) and what is good enough for the internet must be good enough for us™ as we reuse the implementation internally to parse (most) dates we encounter in various places like the Release files with their Date and Valid-Until header fields. Implementing a fully timezone aware parser just feels too hard for no effective benefit as it would take 5+ years (= until LTS's are out of fashion) until a repository could use non-UTC dates and expect it to work. Not counting non-apt implementations which might or might not only want to encounter UTC here as well. As a bonus, this eliminates the use of an instance of setlocale in libapt. Closes: 819697
2016-05-27prevent C++ locale number formatting in text APIsDavid Kalnischkies
Setting the C++ locale via std::locale::global(std::locale("")); which would otherwise default to the default C locale (aka: unaffected by setlocale) effects the formatting of numeric types in IO streams, which for output for humans is perfectly sensible, but breaks our many text interfaces used and parsed by us and others without expecting the numbers to be formatted. Closes: #825396
2016-05-20edsp: try harder to not generate unneeded error messagesDavid Kalnischkies
The &= introduced in the EDSP-FileFd conversion isn't working to full satisfaction for multiple && clauses as the && has a higher binding than &= has, so that the methods were called even through they shouldn't have because of previous errors. Using variadic functions we can solve this in a slightly cleaner way bringing down the amount of 'broken pipe' errors for the error case of the dump resolver substantially. Git-Dch: Ignore
2016-05-20convert EDSP to be based on FileFd instead of FILE*David Kalnischkies
I doubt there is any non-src:apt usage of these interfaces.
2016-05-10Merge pull request julian-klode/apt#3 from adrian17/masterJulian Andres Klode
Improve GetLocalitySortedVersionSet, speeds up apt search by 30%
2016-05-03remove 100-levels config nesting limitDavid Kalnischkies
The actual reason for this commit isn't the limit – there isn't much point in using that much nesting – its in shutting up gcc mostly: apt/apt-pkg/contrib/configuration.cc: In function ‘bool ReadConfigFile(Configuration&, const string&, const bool&, const unsigned int&)’: apt/apt-pkg/contrib/configuration.cc:686:20: warning: cannot optimize loop, the loop counter may overflow [-Wunsafe-loop-optimizations] string Stack[100]; ^ by replacing this with C++s handy std::stack container (adapter). Also cleans some whitespace noise from the file in the process.
2016-05-01Don't copy strings in Startswith, EndswithAdrian Wielgosik
2016-04-28FileFd: avoid further writing if file failedDavid Kalnischkies
If the file is in a failed state there is no point in trying to flush out the buffers as the file is to be discarded anyhow & its likely all this flushing is producing is additional error messages. Git-Dch: Ignore
2016-04-25properly format multiline error messagesDavid Kalnischkies
2016-04-03use buffered writing for InRelease splittingDavid Kalnischkies
Hardly noticeable, but given that we have the option to easily enable it, lets enable it as every newline in the message is written individually by the code.
2016-04-03consistently add APT_OVERRIDE as method markerDavid Kalnischkies
Some methods had it missing, some used the keyword directly, which isn't a problem as it is a cc file, but for consistency lets stick to our macro for now. Git-Dch: Ignore
2016-03-28Allow lowering trust level of a hash via configJulian Andres Klode
Introduces APT::Hashes::<NAME> with entries Untrusted and Weak which can be set to true to cause the hash to be treated as untrusted and/or weak.