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path: root/methods/http.cc
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2017-10-22Sandbox methods with seccomp-BPF; except cdrom, gpgv, rshJulian Andres Klode
This reduces the number of syscalls to about 140 from about 350 or so, significantly reducing security risks. Also change prepare-release to ignore the architecture lists in the build dependencies when generating the build-depends package for travis. We might want to clean up things a bit more and/or move it somewhere else.
2017-10-22Run Proxy-Auto-Detect script from main processJulian Andres Klode
This avoids running the Proxy-Auto-Detect script inside the untrusted (well, less trusted for now) sandbox. This will allow us to restrict the http method from fork()ing or exec()ing via seccomp.
2017-07-26allow the auth.conf to be root:root ownedDavid Kalnischkies
Opening the file before we drop privileges in the methods allows us to avoid chowning in the acquire main process which can apply to the wrong file (imagine Binary scoped settings) and surprises users as their permission setup is overridden. There are no security benefits as the file is open, so an evil method could as before read the contents of the file, but it isn't worse than before and we avoid permission problems in this setup.
2017-07-26reimplement and document auth.confDavid Kalnischkies
We have support for an netrc-like auth.conf file since 0.7.25 (closing 518473), but it was never documented in apt that it even exists and netrc seems to have fallen out of usage as a manpage for it no longer exists making the feature even more arcane. On top of that the code was a bit of a mess (as it is written in c-style) and as a result the matching of machine tokens to URIs also a bit strange by checking for less specific matches (= without path) first. We now do a single pass over the stanzas. In practice early adopters of the undocumented implementation will not really notice the differences and the 'new' behaviour is simpler to document and more usual for an apt user. Closes: #811181
2017-07-26fail early in http if server answer is too small as wellDavid Kalnischkies
Failing on too much data is good, but we can do better by checking for exact filesizes as we know with hashsums how large a file should be, so if we get a file which has a size we do not expect we can drop it directly, regardless of if the file is larger or smaller than what we expect which should catch most cases which would end up as hashsum errors later now a lot sooner.
2017-07-26fail earlier if server answers with too much dataDavid Kalnischkies
We tend to operate on rather large static files, which means we usually get Content-Length information from the server. If we combine this information with the filesize we are expecting (factoring in pipelining) we can avoid reading a bunch of data we are ending up rejecting anyhow by just closing the connection saving bandwidth and time both for the server as well as the client.
2017-07-12Reformat and sort all includes with clang-formatJulian Andres Klode
This makes it easier to see which headers includes what. The changes were done by running git grep -l '#\s*include' \ | grep -E '.(cc|h)$' \ | xargs sed -i -E 's/(^\s*)#(\s*)include/\1#\2 include/' To modify all include lines by adding a space, and then running ./git-clang-format.sh.
2017-07-03Stop bragging about old speeds in http.cc commentsJulian Andres Klode
That's just ridiculous these days. Gbp-Dch: ignore
2017-06-30http: Add support for https:// proxiesJulian Andres Klode
HTTPS proxies just require unwrapping the TLS layer at the proxy connection, that's easy, and of course sending proxy-specific headers that are sent on "http" proxies.
2017-06-30http: Add support for CONNECT proxying to HTTPS locationsJulian Andres Klode
Proxying HTTPS traffic requires the proxy providing the CONNECT method. This implements the client side of it, although it is a bit hacky. HTTP connect is a normal HTTP CONNECT request, followed by a normal HTTP response, just that the body of the response is the TCP stream of the target host. We use a special wrapper in case there are data bytes in the header packets - in that case, the bytes are stored in a buffer and the buffer will be drained first, afterwards the connection continues directly with the TCP stream (with one more vcall). Also: Do not send full URI to https destinations when proxying, as we are directly interfacing with the destination data stream.
2017-06-28support tor+https being handled by httpDavid Kalnischkies
The apt-transport-tor package operates via simple symlinks which can result in 'http' being called as 'tor+https', so it must pick up the right configuration pieces and trigger https support also in plus names.
2017-06-28methods: http: Drain pending data before selectingJulian Andres Klode
GnuTLS can already have data pending in its buffers, we need to to drain that first otherwise select() might block indefinitely. Gbp-Dch: ignore
2017-06-28methods: Add HTTPS support to http method, using GnuTLSJulian Andres Klode
The http method will eventually replace the curl-based https method, but for now, this is an opt-in experiment that can be enabled by setting Dir::Bin::Methods::https to "http". Known issues: - We do not support HTTPS proxies yet - We do not support proxying HTTPS connections yet (CONNECT) - IssuerCert and SslForceVersion are unsupported Gbp-Dch: Full
2017-06-28methods: connect: Switch from int fds to new MethodFdJulian Andres Klode
Use std::unique_ptr<MethodFd> everywhere we used an integer-based file descriptor before. This allows us to implement stuff like TLS support easily. Gbp-Dch: ignore
2016-12-31rename ServerMethod to BaseHttpMethodDavid Kalnischkies
This 'method' is the abstract base for http and https and should as such be called out like this rather using an easily confused name. Gbp-Dch: Ignore
2016-12-31separating state variables regarding server/requestDavid Kalnischkies
Having a Reset(bool) method to partially reset certain variables like the download size always were strange, so this commit splits the ServerState into an additional RequestState living on the stack for as long as we deal with this request causing an automatic "reset". There is much to do still to make this code look better, but this is a good first step which compiles cleanly and passes all tests, so keeping it as history might be beneficial and due to avoiding explicit memory allocations it ends up fixing a small memory leak in https, too. Closes: #440057
2016-11-11http: skip connection cleanup if we close it anyhowDavid Kalnischkies
Suggested in #529794
2016-11-10improve SOCKS error messages for http slightlyDavid Kalnischkies
The 0.0.0.0:0 tor reports is pretty useless by itself, but even if an IP would be reported it is better to show the user the hostname we wanted the proxy to connect to in the same error message. We improve upon it further by looking for this bind address in particular and remap error messages slightly to give users a better chance of figuring out what went wrong. Upstream Tor can't do that as it is technically wrong.
2016-08-16don't sent Range requests if we know its not acceptedDavid Kalnischkies
If the server told us in a previous request that it isn't supporting Ranges with bytes via an Accept-Ranges header missing bytes, we don't try to formulate requests using Ranges.
2016-08-16reorganize server-states resetting in http/httpsDavid Kalnischkies
We keep various information bits about the server around, some only effecting the currently handled file (like sizes) while others should be persistent (like pipeline detections). http used to reset all file-related manually, which is a bit silly if we already have a Reset() method – which does reset all through –, so extending it with a parameter for reuse and calling it from https too (as this was previously resetting by just creating a new state struct – it uses no value of the persistent state-keeping yet as it supports no pipelining). Gbp-Dch: Ignore
2016-08-11http: auto-configure for local Tor proxy if called as 'tor'David Kalnischkies
With apts http transport supporting socks5h proxies and all the work in terms of configuration of methods based on the name it is called with it becomes surprisingly easy to implement Tor support equally (and perhaps even a bit exceeding) what is available currently in apt-transport-tor. How this will turn out to be handled packaging wise we will see in https://lists.debian.org/deity/2016/08/msg00012.html , but until this is resolved we can add the needed support without actively enabling it for now, so that this can be tested better.
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
2016-08-10implement generic config fallback for methodsDavid Kalnischkies
The https method implemented for a long while now a hardcoded fallback to the same options in http, which, while it works, is rather inflexible if we want to allow the methods to use another name to change their behavior slightly, like apt-transport-tor does to https – most of the diff being s#https#tor#g which then fails to do the full circle fallthrough tor -> https -> http for https sources. With this config infrastructure this could be implemented now.
2016-08-10use the same redirection handling for http and httpsDavid Kalnischkies
cURL which backs our https implementation can handle redirects on its own, but by dealing with them on our own we gain finer control over which redirections will be performed (we don't like https → http) and by whom so that redirections to other hosts correctly spawn a new https method dealing with these instead of letting the current one deal with it.
2016-08-10detect redirection loops in acquire instead of workersDavid Kalnischkies
Having the detection handled in specific (http) workers means that a redirection loop over different hostnames isn't detected. Its also not a good idea have this implement in each method independently even if it would work
2016-08-10fail on unsupported http/https proxy settingsDavid Kalnischkies
Closes: #623443
2016-07-30prevent C++ locale number formatting in text APIs (try 2)David Kalnischkies
Followup of b58e2c7c56b1416a343e81f9f80cb1f02c128e25. Still a regression of sorts of 8b79c94af7f7cf2e5e5342294bc6e5a908cacabf. Closes: 832044
2016-07-05avoid 416 response teardown binding to null pointerDavid Kalnischkies
methods/http.cc:640:13: runtime error: reference binding to null pointer of type 'struct FileFd' This reference is never used in the cases it has a nullptr, so the practical difference is non-existent, but its a bug still. Reported-By: gcc -fsanitize=undefined
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.
2016-06-15http: don't hang on redirect with length + connection closeDavid Kalnischkies
Most servers who close the connection do not send a content-length as this is redundant information usually, but some might and while testing with our server and with 'aptwebserver::response-header::Connection' set to 'close' I noticed that http hangs after a redirect in such cases, so if we have the information, just use it instead of discarding it.
2016-05-28use std::locale::global instead of setlocaleDavid Kalnischkies
We use a wild mixture of C and C++ ways of generating output, so having a consistent world-view in both styles sounds like a good idea and should help in preventing regressions.
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
2015-09-14fix two memory leaks reported by gccDavid Kalnischkies
Reported-By: gcc -fsanitize=address -fno-sanitize=vptr Git-Dch: Ignore
2015-05-22Merge branch 'debian/sid' into debian/experimentalMichael Vogt
Conflicts: apt-pkg/pkgcache.h debian/changelog methods/https.cc methods/server.cc test/integration/test-apt-download-progress
2015-05-22Fix endless loop in apt-get update that can cause disk fillupMichael Vogt
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
2015-04-19calculate hashes while downloading in httpsDavid Kalnischkies
We do this in HTTP already to give the CPU some exercise while the disk is heavily spinning (or flashing?) to store the data avoiding the need to reread the entire file again later on to calculate the hashes – which happens outside of the eyes of progress reporting, so you might ended up with a bunch of https workers 'stuck' at 100% while they were busy calculating hashes. This is a bummer for everyone using apt as a connection speedtest as the https method works slower now (not really, it just isn't reporting done too early anymore).
2015-04-19calculate only expected hashes in methodsDavid Kalnischkies
Methods get told which hashes are expected by the acquire system, which means we can use this list to restrict what we calculate in the methods as any extra we are calculating is wasted effort as we can't compare it with anything anyway. Adding support for a new hash algorithm is therefore 'free' now and if a algorithm is no longer provided in a repository for a file, we automatically stop calculating it. In practice this results in a speed-up in Debian as we don't have SHA512 here (so far), so we practically stop calculating it.
2015-04-19handle servers closing encoded connections correctlyDavid Kalnischkies
Servers who advertise that they close the connection get the 'Closes' encoding flag, but this conflicts with servers who response with a transfer-encoding (e.g. encoding) as it is saved in the same flag. We have a better flag for the keep-alive (or not) of the connection anyway, so we check this instead of the encoding. This is in practice not much of a problem as real servers we talk to are HTTP1.1 servers (with keep-alive) and there isn't much point in doing chunked encoding if you are going to close anyway, but our simple testserver stumbles over this if pressed and its a bit cleaner, too. Git-Dch: Ignore
2015-03-16derive more of https from http methodDavid Kalnischkies
Bug #778375 uncovered that https wasn't properly integrated in the class family tree of http as it was supposed to be leading to a NULL pointer dereference. Fixing this 'properly' was deemed to much diff for practically no gain that late in the release, so commit 0c2dc43d4fe1d026650b5e2920a021557f9534a6 just fixed the synptom, while this commit here is fixing the cause plus adding a test.
2014-12-22dispose http(s) 416 error page as non-contentDavid Kalnischkies
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
2014-12-09dispose http(s) 416 error page as non-contentDavid Kalnischkies
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. Closes: 768797
2014-10-13Fix backward compatiblity of the new pkgAcquireMethod::DropPrivsOrDie()Michael Vogt
Do not drop privileges in the methods when using a older version of libapt that does not support the chown magic in partial/ yet. To do this DropPrivileges() now will ignore a empty Apt::Sandbox::User. Cleanup all hardcoded _apt along the way.
2014-10-07Send "Fail-Reason: MaximumSizeExceeded" from the methodMichael Vogt
Communicate the fail reason from the methods to the parent and Rename() failed files.
2014-10-07make expected-size a maximum-size check as this is what we want at this pointMichael Vogt
2014-10-06make http size check workMichael Vogt
2014-09-02Make Proxy-Auto-Detect check for each hostMichael Vogt
When doing Acquire::http{,s}::Proxy-Auto-Detect, run the auto-detect command for each host instead of only once. This should make using "proxy" from libproxy-tools feasible which can then be used for PAC style or other proxy configurations. Closes: #759264
2014-08-26Pass ExpectedSize to tthe backend methodMichael Vogt
This ensures that we can stop downloading if the server send too much data by accident (or by a malicious attempt)
2014-06-24methods/http.cc: use Req.str() in debug outputMichael Vogt
2014-04-26build http request in a stringstreamDavid Kalnischkies
beside reducing code a bit, it avoids oddball problems while building the string and doesn't trigger static analyse warnings.
2014-03-13follow method attribute suggestions by gccDavid Kalnischkies
Git-Dch: Ignore Reported-By: gcc -Wsuggest-attribute={pure,const,noreturn}