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service is running
This adds a new boolean setting DynamicUser= to service files. If set, a new
user will be allocated dynamically when the unit is started, and released when
it is stopped. The user ID is allocated from the range 61184..65519. The user
will not be added to /etc/passwd (but an NSS module to be added later should
make it show up in getent passwd).
For now, care should be taken that the service writes no files to disk, since
this might result in files owned by UIDs that might get assigned dynamically to
a different service later on. Later patches will tighten sandboxing in order to
ensure that this cannot happen, except for a few selected directories.
A simple way to test this is:
systemd-run -p DynamicUser=1 /bin/sleep 99999
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It's a bit easier to read because shorter. Also, most likely a tiny bit faster.
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The loop on bus_match_run should break and return immediately if
bus->match_callbacks_modified is true. Otherwise the loop may access
free'd data.
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the pager (#3550)
If "systemctl -H" is used, let's make sure we first terminate the bus
connection, and only then close the pager. If done in this order ssh will get
an EOF on stdin (as we speak D-Bus through ssh's stdin/stdout), and then
terminate. This makes sure the standard error we were invoked on is released by
ssh, and only that makes sure we don't deadlock on the pager which waits for
all clients closing its input pipe.
(Similar fixes for the various other xyzctl tools that support both pagers and
-H)
Fixes: #3543
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This is now the recommended way to do monitoring by upstream D-Bus.
It's also allowed in the default policy, whereas eavesdrop is not
anymore, which effectively broke busctl on many systems.
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That function doesn't draw anything on it's own, just returns a string, which
sometimes is more than one character. Also remove "DRAW_" prefix from character
names, TREE_* and ARROW and BLACK_CIRCLE are unambigous on their own, don't
draw anything, and are always used as an argument to special_glyph().
Rename "DASH" to "MDASH", as there's more than one type of dash.
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The macro determines the right length of a AF_UNIX "struct sockaddr_un" to pass to
connect() or bind(). It automatically figures out if the socket refers to an
abstract namespace socket, or a socket in the file system, and properly handles
the full length of the path field.
This macro is not only safer, but also simpler to use, than the usual
offsetof() + strlen() logic.
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If the SD_BUS_CREDS_SUPPLEMENTARY_GIDS value is requested, the pid is
queried to find out the supplementary gids value from /proc/pid/status.
Otherwise sd_bus_creds_get_supplementary_gids() won't work unless some
other value in mask triggered fetching the pid information.
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be enabled
We don't allow using config symlinks to enable units, but the error message we
printed was awful. Fix that, and generate a more readable error.
Fixes #3010.
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Let's be precise when the user tries to invoke an "enable" operation on a
generated unit file.
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tree-wide: merge pager_open_if_enabled() to the pager_open()
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Many subsystems define own pager_open_if_enabled() function which
checks '--no-pager' command line argument and open pager depends
on its value. All implementations of pager_open_if_enabled() are
the same. Let's merger this function with pager_open() from the
shared/pager.c and remove pager_open_if_enabled() from all subsytems
to prevent code duplication.
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Throughout the tree there's spurious use of spaces separating ++ and --
operators from their respective operands. Make ++ and -- operator
consistent with the majority of existing uses; discard the spaces.
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remove bus-proxyd
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Previously we'd miss a necessary whitespace at the end of arrays, if more data
was following.
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Better support of OPENPGPKEY, CAA, TLSA packets and tests
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As kdbus won't land in the anticipated way, the bus-proxy is not needed in
its current form. It can be resurrected at any time thanks to the history,
but for now, let's remove it from the sources. If we'll have a similar tool
in the future, it will look quite differently anyway.
Note that stdio-bridge is still available. It was restored from a version
prior to f252ff17, and refactored to make use of the current APIs.
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This feature will not be used anytime soon, so remove a bit of cruft.
The BusPolicy= config directive will stay around as compat noop.
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ISO/IEC 9899:1999 §7.21.1/2 says:
Where an argument declared as size_t n specifies the length of the array
for a function, n can have the value zero on a call to that
function. Unless explicitly stated otherwise in the description of a
particular function in this subclause, pointer arguments on such a call
shall still have valid values, as described in 7.1.4.
In base64_append_width memcpy was called as memcpy(x, NULL, 0). GCC 4.9
started making use of this and assumes This worked fine under -O0, but
does something strange under -O3.
This patch fixes a bug in base64_append_width(), fixes a possible bug in
journal_file_append_entry_internal(), and makes use of the new function
to simplify the code in other places.
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This should be handled fine now by .dir-locals.el, so need to carry that
stuff in every file.
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This commit changes the mapping of the BUS_ERROR_UNIT_MASKED error to ESHUTDOWN. This error is used whenever the
transaction engine is asked to operate on a masked unit. ESHUTDOWN is what is used for the similar case when the unit
file enable/disable logic hits a masked unit file, hence is a natural candidate to be used here too.
Background: before this patch both "job type not applicable" and "unit masked" where mapped to EBADR, which
transaction_add_job_and_dependencies() then checked for. It actually wanted to check exclusively for the former error
condition, not the latter but due to the same mapping this failed to work.
This patch semi-undoes an accidental change made in caffa4ef700fdd0eadd6c0b2ef9925611672a1bc, however restores the
error number to ESHUTDOWN instead of the original ENOSYS (for the reasons indicated above).
To make this easier to grok for the future, I added comments to explaining which error conditions are checked for.
Fixes: #2315
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the network is down
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This is useful for alternative network management solutions (such as NetworkManager) to push DNS configuration data
into resolved.
The calls will fail should networkd already have taken possesion of a link, so that the bus API is only available if
we don't get the data from networkd.
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These were previously forgotten, add them now.
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Setting of dst_id was based on interplay of two booleans,
making the logic hard to follow (for humans and compilers alike).
gcc was confused and emmitted a warning about an uninitialized
variable. Rework the code to make it obvious that dst_id is
set properly.
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Go over the entries in the map and check that they make sense.
Tests are added. In the future we might want to do additional
checks, e.g. verifying that the error names are in the expected
format.
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errno_from_name used an unusual return convention where 0 meant
"not found". This tripped up config_parse_syscall_errno(),
which would treat that as success. Return -EINVAL instead,
and adjust bus_error_name_to_errno() for the new convention.
Also remove a goto which was used as a simple if and clean
up surroudning code a bit.
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Also add a coccinelle receipt to help with such transitions.
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supporting them
If we already degraded the feature level below DO don't bother with sending requests for DS, DNSKEY, RRSIG, NSEC, NSEC3
or NSEC3PARAM RRs. After all, we cannot do DNSSEC validation then anyway, and we better not press a legacy server like
this with such modern concepts.
This also has the benefit that when we try to validate a response we received using DNSSEC, and we detect a limited
server support level while doing so, all further auxiliary DNSSEC queries will fail right-away.
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Fixes:
$ make valgrind-tests TESTS=test-bus-cleanup
==6363== 9 bytes in 1 blocks are possibly lost in loss record 1 of 28
==6363== at 0x4C2BBCF: malloc (vg_replace_malloc.c:299)
==6363== by 0x197D12: hexmem (hexdecoct.c:79)
==6363== by 0x183083: bus_socket_start_auth_client (bus-socket.c:639)
==6363== by 0x1832A0: bus_socket_start_auth (bus-socket.c:678)
==6363== by 0x183438: bus_socket_connect (bus-socket.c:705)
==6363== by 0x14B0F2: bus_start_address (sd-bus.c:1053)
==6363== by 0x14B592: sd_bus_start (sd-bus.c:1134)
==6363== by 0x14B95E: sd_bus_open_system (sd-bus.c:1235)
==6363== by 0x1127E2: test_bus_open (test-bus-cleanup.c:42)
==6363== by 0x112AAE: main (test-bus-cleanup.c:87)
==6363==
...
$ ./libtool --mode=execute valgrind ./test-bus-cleanup
==6584== LEAK SUMMARY:
...
==6584== possibly lost: 10,566 bytes in 27 blocks
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Since we honour RFC5011 revoked keys it might happen we end up with an
empty trust anchor, or one where there's no entry for the root left.
With this patch the logic is changed what to do in this case.
Before this patch we'd end up requesting the root DS, which returns with
NODATA but a signed NSEC we cannot verify, since the trust anchor is
empty after all. Thus we'd return a DNSSEC result of "missing-key", as
we lack a verified version of the key.
With this patch in place, look-ups for the root DS are explicitly
recognized, and not passed on to the DNS servers. Instead, if
downgrade-ok mode is on an unsigned NODATA response is synthesized, so
that the validator code continues under the assumption the root zone was
unsigned. If downgrade-ok mode is off a new transaction failure is
generated, that makes this case recognizable.
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Ninth DNSSEC patch set
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This was missing when the error type was added in
ac720200b7e5b80cc4985087e38f3452e5b3b080.
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EIO is really too generic, and indicates transmission problems.
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Fixes:
```
$ ./configure ... --enable-dbus
$ make
$ make valgrind-tests TESTS=test-bus-marshal
...
==25301== 51 bytes in 1 blocks are definitely lost in loss record 7 of 18
==25301== at 0x4C2DD9F: realloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==25301== by 0x5496B8C: ??? (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x54973E3: _dbus_string_append_printf_valist (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x547E5C2: _dbus_set_error_valist (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x547E73E: dbus_set_error (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x548969A: dbus_message_demarshal (in /lib/x86_64-linux-gnu/libdbus-1.so.3.14.3)
==25301== by 0x115C1A: main (test-bus-marshal.c:244)
==25301==
```
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via TCP
Previously, if we couldn't reach a server via UDP we'd generate an
MAX_ATTEMPTS transaction result, but if we couldn't reach it via TCP
we'd generate a RESOURCES transaction result. While it is OK to generate
two different errors I think, "RESOURCES" is certainly a misnomer.
Introduce a new transaction result "CONNECTION_FAILURE" instead.
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We need to check the same thing in multiple tests. Use a shared
macro to make it easier to update the list of errnos.
Change the errno code for "unitialized cgroup fs" for ENOMEDIUM.
Exec format error looks like something more serious.
This fixes test-execute invocation in mock.
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Let's distuingish the cases where our code takes an active role in
selinux management, or just passively reports whatever selinux
properties are set.
mac_selinux_have() now checks whether selinux is around for the passive
stuff, and mac_selinux_use() for the active stuff. The latter checks the
former, plus also checks UID == 0, under the assumption that only when
we run priviliged selinux management really makes sense.
Fixes: #1941
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GLIB has recently started to officially support the gcc cleanup
attribute in its public API, hence let's do the same for our APIs.
With this patch we'll define an xyz_unrefp() call for each public
xyz_unref() call, to make it easy to use inside a
__attribute__((cleanup())) expression. Then, all code is ported over to
make use of this.
The new calls are also documented in the man pages, with examples how to
use them (well, I only added docs where the _unref() call itself already
had docs, and the examples, only cover sd_bus_unrefp() and
sd_event_unrefp()).
This also renames sd_lldp_free() to sd_lldp_unref(), since that's how we
tend to call our destructors these days.
Note that this defines no public macro that wraps gcc's attribute and
makes it easier to use. While I think it's our duty in the library to
make our stuff easy to use, I figure it's not our duty to make gcc's own
features easy to use on its own. Most likely, client code which wants to
make use of this should define its own:
#define _cleanup_(function) __attribute__((cleanup(function)))
Or similar, to make the gcc feature easier to use.
Making this logic public has the benefit that we can remove three header
files whose only purpose was to define these functions internally.
See #2008.
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This is a continuation of the previous include sort patch, which
only sorted for .c files.
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siphash24: let siphash24_finalize() and siphash24() return the result…
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