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When accessing repository protected by TLS mutual auth, apt may receive
a "re-handshake" request from the server, which must be handled
in order for download to proceed.
This situation arises when the server requests a client certificate
based on the resource path provided in the GET request, after the inital
handshake in UnwrapTLS() has already occurred, and a secure connection
has been established.
This issue has been observed with Artifactory-backed Debian repository.
To address the issue, split TLS handshake code out into its own method
in TlsFd, and call it when GNUTLS_E_REHANDSHAKE error is received.
Signed-off-by: Michael Zhivich <mzhivich@akamai.com>
(merged from Debian/apt#93)
LP: #1829861
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Correctly register timed out IP addresses from a timed out
select() call as a bad address so we do not try it again.
LP: #1766542
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Closes: #898886
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Prompted-by: Jakub Wilk <jwilk@debian.org>
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Commit 47c0bdc310c8cd62374ca6e6bb456dd183bdfc07 ("report transient
errors as transient error") accidentally changed some connection
failures to become non-transient, because the result of the error
checks where being ignored and then fatal error was returned if an
error was pending - even if that error was trivial.
After the merge of pu/happy-eyeballs2a this becomes a lot clearer,
and easy to fix.
Gbp-Dch: ignore
Regression-Of: 47c0bdc310c8cd62374ca6e6bb456dd183bdfc07
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Try establishing connections in alternating address families in
rapid intervals of 250 ms, adding more connections to the wait
list until one succeeds (RFC 8305, happy eyeballs 2).
It is important that WaitAndCheckErrors() waits until it has
a successful connection, a time out, or all connections failed
- otherwise the timing between tries might be wrong, and the
final long wait might exit early because one connection failed
without trying the others. Timing wise, this only works correctly
on Linux, as select() counts down there. But we rely on that in
some other places too, so this is not the time to fix that.
Timeouts are only reported in the final long wait - the short
inner waits are expected to time out more often, and multiple
times, we do not want to report them.
Closes: #668948
LP: #1308200
Gbp-Dch: paragraph
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Extracting the error checking method allows us to reuse it
in different places, so we can move the waiting and checking
out of DoConnect() eventually.
Gbp-Dch: ignore
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There's no real point in storing the IP address while resolving
it - failure messages include the IP address in any case. Do this
when picking the connection for actual use instead.
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This struct holds information about a connection attempt, like
the addrinfo, the resolved address, the fd for the connection,
and so on.
Gbp-Dch: ignore
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As a first step to implementing Happy Eyeballs version 2, we
need to order the list of hosts getaddrinfo() gave us so it
alternates between preferred and other address families.
RFC: https://tools.ietf.org/html/rfc8305
Gbp-Dch: ignore
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The Fail method for acquire methods has a boolean parameter indicating
the transient-nature of a reported error. The problem with this is that
Fail is called very late at a point where it is no longer easily
identifiable if an error is indeed transient or not, so some calls were
and some weren't and the acquire system would later mostly ignore the
transient flag and guess by using the FailReason instead.
Introducing a tri-state enum we can pass the information about fatal or
transient errors through the callstack to generate the correct fails.
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APT connects just fine to any .onion address given, only if the connect
fails somehow it will perform checks on the sanity of which in this case
is checking the length as they are well defined and as the strings are
arbitrary a user typing them easily mistypes which apt should can be
slightly more helpful in figuring out by saying the onion hasn't the
required length.
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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.
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It is kinda unlikely that apt will ever encounter a certificate for an
IP and a user actually using it, but the API documentation for
gnutls_server_name_set explicitly says that "IPv4 or IPv6 addresses are
not permitted to be set by this function.", so we should follow it.
[jak@d.o: Slightly rebased]
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This makes more sense. If the handshake failed midway, we still
should run the gnutls bye stuff. The thinking here is to only
set the fd after the session setup, as we do not modify it
before, so if it fails in session setup, you retain a usable
file descriptor.
Gbp-Dch: ignore
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This probably makes more sense if Verify-Peer is set to off.
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This should make it easier to figure out what was
going on.
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We can actually just pass null as a hostname, so let's just
do that when Verify-Host is set to false.
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Silently ignoring the options might be a security issue,
so produce an error instead.
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If gnutls_session_bye() exited with an error, we never closed
the underlying file descriptor, causing the method to think the
connection was still open. This caused problems especially in
test-partial-file-support where we checked that a "complete"
file and an incomplete file work. The first GET returns a 416
with Connection: close, and the next GET request then accidentally
reads the body of the 416 as the header for its own request.
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This is especially needed if we use an HTTPS proxy to CONNECT
to an HTTPS URI, as we run TLS-inside-TLS then.
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When APT was trying multiple addresses, any later error
somewhere else would be reported with ConnectionRefused
or ConnectionTimedOut as the FailReason because that
was set by early connect attempts. This causes APT to
handle the failures differently, leading to some weirdly
breaking test cases (like the changed one).
Add debugging to the previously failing test case so
we can find out when something goes wrong there again.
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This fixes a regression from ~alpha2.
Closes: #866559
Gbp-Dch: Full
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It turns out that curl only sets the system trust store if
the CaInfo option is not set, so let's do the same here.
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Tell the user to install ca-certificates.
Closes: #866377
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An SRV record includes a portnumber to use with the host given, but apt
was ignoring the portnumber and instead used either the port given by
the user for the initial host or the default port for the service.
In practice the service usually runs on another host on the default
port, so it tends to work as intended and even if not and apt can't get
a connection there it will gracefully fallback to contacting the initial
host with the right port, so its a user invisible bug most of the time.
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As requested by Henrique de Moraes Holschuh, here comes
an option to disable TLS support. If the option is set
to false, the internal TLS layer is disabled.
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GnuTLS can already have data pending in its buffers, we need
to to drain that first otherwise select() might block
indefinitely.
Gbp-Dch: ignore
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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
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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
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This will allow us to access ConfigFind() and stuff which makes
it possible for us to implement TLS support.
Gbp-Dch: ignore
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Commit 3af3ac2f5ec007badeded46a94be2bd06b9917a2 (released in 1.3~pre1)
implements proper fallback for SRV, but that works actually too good
as the RFC defines that such an SRV record should indicate that the
server doesn't provide this service and apt should respect this.
The solution is hence to fail again as requested even if that isn't what
the user (and perhaps even the server admins) wanted. At least we will
print a message now explicitly mentioning SRV to point people in the
right direction.
Reported-In: https://bugs.kali.org/view.php?id=3525
Reported-By: Raphaël Hertzog
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Gbp-Dch: ignore
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Doing a direct connect to an .onion address (if you don't happen to use
it as a local domain, which you shouldn't) is bound to fail and does
leak the information that you do use Tor and which hidden service you
wanted to connect to to a DNS server. Worse, if the DNS is poisoned and
actually resolves tricking a user into believing the setup would work
correctly…
This does block also the usage of wrappers like torsocks with apt, but
with native support available and advertised in the error message this
shouldn't really be an issue.
Inspired-by: https://bugzilla.mozilla.org/show_bug.cgi?id=1228457
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Instead of only trying the first host we get via SRV, we try them all as
we are supposed to and if that isn't working we try to connect to the
host itself as if we hadn't seen any SRV records. This was already the
intend of the old code, but it failed to hide earlier problems for the
next call, which would unconditionally fail then resulting in an all
around failure to connect. With proper stacking we can also keep the
error messages of each call around (and in the order tried) so if the
entire connection fails we can report all the things we have tried while
we discard the entire stack if something works out in the end.
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The PopFromSrvRecs() already removed the entry from the active
list, so the extra SrvRecords.erase() was incorrect.
Git-Dch: ignore
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AI_IDN is a glibc extension, but we can worry about this at the time
actually anyone is seriously trying apt on non-glibc systems.
Closes: 763437
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This flags is generally handy to avoid having to deal with ipv6 results on an
ipv4-only system, but it prevents e.g. the testcases from working if the
testsystem has no configured address at the moment (expect loopback), so
allow it to be sidestepped and let the testcases sidestep it.
Git-Dch: Ignore
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Reported-By: gcc
Git-Dch: Ignore
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Thanks: Julian Andres Klode
Git-Dch: ignore
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Also add "Debug::Acquire::SrvRecs" debug option and the option
"Acquire::EnableSrvRecods" to allow disabling this lookup.
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Beside being a bit cleaner it hopefully also resolves oddball problems
I have with high levels of parallel jobs.
Git-Dch: Ignore
Reported-By: iwyu (include-what-you-use)
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The most "visible" change is from utime to utimensat/futimens
as the first one isn't part of POSIX anymore.
Reported-By: cppcheck
Git-Dch: Ignore
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- use Errno() instead of strerror(), thanks to David Kalnischk
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"Acquire::ForceIPv6" to allow focing one or the other
(closes: #611891)
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