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Daniel Kahn Gillmor highlights in the bugreport that security isn't
improving by having the user import additional keys – especially as
importing keys securely is hard.
The bugreport was initially about dropping the warning to a notice, but
in given the previously mentioned observation and the fact that we
weren't printing a warning (or a notice) for expired or revoked keys
providing a signature we drop it completely as the code to display a
message if this was the only key is in another path – and is considered
critical.
Closes: 618445
(Backported from commit fb7b11ebb852fa255053ecab605bc9cfe9de0603)
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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.
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Our own gpgv method can declare a digest algorithm as untrusted and
handles these as worthless signatures. If gpgv comes with inbuilt
untrusted (which is called weak in official terminology) which it e.g.
does for MD5 in recent versions we should handle it in the same way.
To check this we use the most uncommon still fully trusted hash as a
configureable one via a hidden config option to toggle through all of
the three states a hash can be in.
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Using erase(pos) is invalid in our case here as pos must be a valid and
derefenceable iterator, which isn't the case for an end-iterator (like
if we had no good signature).
The problem runs deeper still through as VALIDSIG is a keyid while
GOODSIG is just a longid so comparing them will always fail.
Closes: 818910
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There was a complaint that, in the previous message,
the key fingerprint could be mistaken for a SHA1 digest
due to the (SHA1) after it.
Gbp-Dch: ignore
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This should be easy to extend in the future and allow us to simplify
the error handling cases somewhat.
Thanks: Ron Lee for wording suggestions
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We will drop support for those in the future.
Also adjust the std::array to be a std::vector, as that's easier to
maintain.
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We added weak signatures to BadSigners, meaning that a Release file
signed by both a weak signature and a strong signature would be
rejected; preventing people from migrating from DSA to RSA keys
in a sane way.
Instead of using BadSigners, treat weak signatures like expired
keys: They are no good signatures, and they are worthless.
Gbp-Dch: ignore
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This keeps a list of weak digest algorithms. For now, only MD5
is disabled, as SHA1 breaks to many repos.
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This reverts commit 76a71a1237d22c1990efbc19ce0e02aacf572576.
That commit broke the test suite.
Gbp-Dch: ignore
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ERRSIG is created whenever a key uses an unknown/weak digest
algorithm, for example. This allows us to report a more useful
error than just "unknown apt-key error.":
The following signatures were invalid: ERRSIG 13B00F1FD2C19886 1 2 01 1457609403 5
While still not being the best reportable error message, it's
better than unknown apt-key error and hopefully redirects users
to complain to their repository owners.
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Allows users who know what they are getting themselves into with this
trick to e.g. disable privilege dropping for e.g. file:// until they can
fix up the permissions on those repositories. It helps also the test
framework and people with a similar setup (= me) to run in less modified
environments.
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C++11 adds the 'override' specifier to mark that a method is overriding
a base class method and error out if not. We hide it in the APT_OVERRIDE
macro to ensure that we keep compiling in pre-c++11 standards.
Reported-By: clang-modernize -add-override -override-macros
Git-Dch: Ignore
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The previous commit returns to the possibility of using just gpgv for
verification proposes. There is one problem through: We can't enforce a
specific keyid without using gpg, but our acquire method can as it
parses gpgv output anyway, so it can deal with good signatures from not
expected signatures and treats them as unknown keys instead.
Git-Dch: Ignore
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Limits which key(s) can be used to sign a repository. Not immensely useful
from a security perspective all by itself, but if the user has
additional measures in place to confine a repository (like pinning) an
attacker who gets the key for such a repository is limited to its
potential and can't use the key to sign its attacks for an other (maybe
less limited) repository… (yes, this is as weak as it sounds, but having
the capability might come in handy for implementing other stuff later).
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We use it in other places already as well even though it is farly new
addition to the POSIX family with 2008, but rolling our own here is
really something which should be avoided in such a important method.
Git-Dch: Ignore
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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.
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feature/acq-trans
Conflicts:
apt-pkg/acquire-item.cc
apt-pkg/acquire-item.h
methods/gpgv.cc
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Git-Dch: Ignore
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feature/acq-trans
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Add a new "Debian-apt" user that owns the /var/lib/apt/lists
and /var/cache/apt/archive directories. The methods
http, https, ftp, gpgv, gzip switch to this user when they
start.
Thanks to Julian and "ioerror" and tors "switch_id()" code.
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The old way of handling this was that pkgAcqMetaIndex was responsible
to check/move both Release and Release.gpg in place. This breaks
the assumption of the transaction that each pkgAcquire::Item has
a single File that its responsible for.
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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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Reported-By: cppcheck
Git-Dch: Ignore
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With the selfgrown splitting we got the problem of not recovering
from networks which just reply with invalid data like those sending
us login pages to authenticate with the network (e.g. hotels) back.
The good thing about the InRelease file is that we know that it must
be clearsigned (a Release file might or might not have a detached sig)
so if we get a file but are unable to split it something is seriously
wrong, so there is not much point in trying further.
The Acquire system already looks out for a NODATA error from gpgv,
so this adds a new error message sent to the acquire system in case
the splitting we do now ourselves failed including this magic word.
Closes: #712486
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- ExecGPGV is a method which should never return, so mark it as such
and fix the inconsistency of returning in error cases
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- rename RunGPGV to ExecGPGV and move it to apt-pkg/contrib/gpgv.cc
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done on the mirco-optimazation level, so lets fix them:
(performance) Possible inefficient checking for emptiness.
(performance) Prefer prefix ++/-- operators for non-primitive types.
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code (LP: #784473)
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- set the default values for dir::etc::trusted options correctly
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the call completely
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- move the gpg codecopy to a new method and use it also in methods/gpgv.cc
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- remove the keyrings count limit by using vector magic
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* spot & fix various typos in all manpages
* German manpage translation update
* cmdline/apt-cache.cc:
- remove translatable marker from the "%4i %s\n" string
* buildlib/po4a_manpage.mak:
- instruct debiandoc to build files with utf-8 encoding
* buildlib/tools.m4:
- fix some warning from the buildtools
* apt-pkg/acquire-item.cc:
- add configuration PDiffs::Limit-options to not download
too many or too big patches (Closes: #554349)
* debian/control:
- let all packages depend on ${misc:Depends}
* share/*-archive.gpg:
- remove the horrible outdated files. We already depend on
the keyring so we don't need to ship our own version
* cmdline/apt-key:
- errors out if wget is not installed (Closes: #545754)
- add --keyring option as we have now possibly many
* methods/gpgv.cc:
- pass all keyrings (TrustedParts) to gpgv instead of
using only one trusted.gpg keyring (Closes: #304846)
* methods/https.cc:
- finally merge the rest of the patchset from Arnaud Ebalard
with the CRL and Issuers options, thanks! (Closes: #485963)
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- properly check for expired and revoked keys (closes: #433091)
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- fix compiler warning
* cmdline/apt-get.cc:
- fix "apt-get source pkg=ver" if binary name != source name
and show a message (LP: #202219)
* apt-pkg/deb/debsystem.cc:
- make strings i18n able
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message when gpgv isn't installed, closes: #452640.
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apt-get to ignore time conflicts, closes: #451328.
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- remove cruft code that caused timestamp/I-M-S issues
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- deal with gpgs NODATA message
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