It is normal for DHCP leases not to have DNR options. We need to be less
verbose and more forgiving in these cases. Also, if either DHCP does not
have DNR options, make sure to still consider any DHCPv6/RA options.
Fixes: c7c9e3c7c0 (network: adjust log message about DNR)
This new setting allows unsharing the pid namespace in a unit. Because
you have to fork to get a process into a pid namespace, we fork in
systemd-executor to get into the new pid namespace. The parent then
sends the pid of the child process back to the manager and exits while
the child process continues on with the rest of exec_invoke() and then
executes the actual payload.
Communicating the child pid is done via a new pidref socket pair that is
set up on manager startup.
We unshare the PID namespace right before the mount namespace so we
mount procfs correctly. Note PrivatePIDs=yes always implies MountAPIVFS=yes
to mount procfs.
When running unprivileged in a user session, user namespace is set up first
to allow for PID namespace to be unshared. However, when running in
privileged mode, we unshare the user namespace last to ensure the user
namespace does not own the PID namespace and cannot break out of the sandbox.
Note we disallow Type=forking services from using PrivatePIDs=yes since the
init proess inside the PID namespace must not exit for other processes in
the namespace to exist.
Note Daan De Meyer did the original work for this commit with Ryan Wilson
addressing follow-ups.
Co-authored-by: Daan De Meyer <daan.j.demeyer@gmail.com>
In https://bugzilla.redhat.com/show_bug.cgi?id=2322937 we're getting
an error message:
Okt 29 22:21:03 fedora systemd-resolved[29311]: Could not create manager: Cannot allocate memory
I expect that this actually comes from dnstls_manager_init(), the
openssl version. But without real logs it's hard to know for sure.
Use EIO instead of ENOMEM, because the problem is unlikely to be actually
related to memory.
We need a sensible limit on the number of Encrypted DNS options allowed
so that the set of resolvers per link does not grow without bound.
Fixes: 0c90d1d2f2 ("ndisc: Parse RFC9463 encrypted DNS (DNR) option")
This allows a single tmpfiles snippet with lines to symlink directories
from /usr/share/factory to be shared across many different configurations
while making sure symlinks only get created if the source actually exists.
We enumerate interfaces at first, then enumerate other configurations
like addresses and so on. If we are running on a container, previously
we started to configure the enumerated interfaces before enumerating other
configurations.
Let's configure interfaces after all configurations are enumerated.
The previous commit removed the UINT_MAX check for the fd array. Let's
now re-add one, but at a better place, and with a more useful limit. As
it turns out the kernel does not allow passing more than 253 fds at the
same time, hence use that as limit. And do so immediately before
calculating the control buffer size, so that we catch multiplication
overflows.
Let's move the helper from nss-resolve.c to generic code, as it's going
to be useful in #34640.
Also, let's tighten the rules, and refuse negative ifindexes, because
they are invalid.
We fucked that up in the original sd_listen() calls, and then we fixed
that on the newer flavours. But pour internal common implementation
should of course use the full range size_t, as it should be.
This then allows us to drop a redundant range check.
This cleans up the handling of the "unset_environment" parameter to
sd_listen() and related calls: the man pages claim we operate on it on
error too. Hence, actually do so in strictly all error paths. Previously
we'd miss out on some, because wrapper functions mishandled them.
This was addressed before in 362dcfc5db
but some codepaths were missed. Complete the work now.
This establishes a common pattern: a function to unset the relevant env
vars, that is called from a goto section at the botom on both success
and failure.
Some kernel SAS drivers (e.g. smartpqi) expose ports with num_phys = 0. udev
shouldn't treat these ports as wide ports. SAS wide ports always have
num_phys > 1. See comments for sas_port_add_phy() in the kernel sources.
Sample data from a smartpqi system to illustrate the issue below.
Here the phy device is attached to port 0:0, which has no end devices attached
and the SAS end device (where sda is attached) is associated with SAS
port 0:1, which has no associated phy device. Thus num_phys for port-0:1 is 0.
This is arguably wrong, but it's how smartpqi has always set up its devices in
sysfs.
/sys/class/sas_phy/phy-0:0 -> ../../devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/phy-0:0/sas_phy/phy-0:0
/sys/devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/port-0:0/phy-0:0 -> ../phy-0:0
/sys/devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/phy-0:0/port -> ../port-0:0
/sys/class/sas_device/end_device-0:1 -> ../../devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/port-0:1/end_device-0:1/sas_device/end_device-0:1
/sys/class/block/sda -> ../../devices/pci0000:46/0000:46:02.0/0000:47:00.0/host0/scsi_host/host0/port-0:1/end_device-0:1/target0:0:0/0:0:0:0/block/sda
Signed-off-by: Martin Wilck <mwilck@suse.com>
In mkosi, we want to support signing via a hardware token. We already
support this in systemd-repart and systemd-measure. However, if the
hardware token is protected by a pin, the pin is asked as many as 20
times when building an image as the pin is not cached and thus requested
again for every operation.
Let's introduce a custom openssl ui when we use engines and providers
and plug systemd-ask-password into the process. With systemd-ask-password,
the pin can be cached in the kernel keyring, allowing us to reuse it without
querying the user again every time to enter the pin.
We use the private key URI as the keyring identifier so that the cached pin
can be shared across multiple tools.
Note that if the private key is pin protected, openssl will prompt both when
loading the private key using the pkcs11 engine and when actually signing the
roothash. To make sure our custom UI is used when signing the roothash, we have
to also configure it with ENGINE_ctrl() which takes a non-owning pointer to
the UI_METHOD object and its userdata object which we have to keep alive so we
introduce a new AskPasswordUserInterface struct which we use to keep both objects
alive together with the EVP_PKEY object.
Because the AskPasswordRequest struct stores non-owning pointers to its fields,
we change repart to store the private key URI as a global variable again instead
of the EVP_PKEY object so that we can use the private key argument as the keyring
field of the AskPasswordRequest instance without running into lifetime issues.
No functional change, at least now. Preparation for later commits.
But we are planning to extend KeepConfiguration= and also keep
addresses and so on assigned by other dynamic configuration protocol
like DHCPv6 or NDisc.
However, when link_free_engines() is called here, acquired addresses so
on by NDisc will be removed, even if link_stop_engines() handles
restarting networkd or KeepConfiguration= gracefully.
So, let's not free engines here, but free them later in link_free().
It is not necessary to be called here anyway.
The names of these conflict with macros from efi.h that we'll move
to efi-fundamental.h in a later commit. Let's avoid the conflict by
getting rid of these helpers. Arguably this also improves readability
by clearly indicating we're passing arbitrary strings and not constants
to the macros when we invoke them.
Currently ask_password_auto() will always try to store the password into
the user keyring. Let's make this configurable so that we can configure
ask_password_auto() into the session keyring. This is required when working
with user namespaces, as the user keyring is namespaced by user namespaces
which makes it impossible to share cached keys across user namespaces by using
the user namespace while this is possible with the session keyring.
Currently, bind-mounted directories within a user/mount namespace get
the uid/gid stored on their files. If the host creates a file in the
source directory, it will still show as root in the namespace.
Id-mapping is a filesystem feature that allows a mount namespace to show
a different uid than what is actually stored on a file. Add support for
id-mappings to exec directories, so that the files within the mount
namespace are owned by the unprivileged uid/gid.
Example:
Using unit:
```
[Unit]
Description=Sample service
[Service]
MountAPIVFS=yes
DynamicUser=yes
PrivateUsers=yes
TemporaryFileSystem=/run /var/opt /var/lib /vol
UMask=0000
ExecStart=/bin/bash -c 'while true; do echo "ping"; sleep 5; done'
StateDirectory=andresstatedir:sampleservice
[Install]
WantedBy=multi-user.target
```
In the host namespace, creating a file "test":
```
root@abeltran-test:/var/lib/andresstatedir# ls -lah
total 8.0K
drwxr-xr-x 2 root root 4.0K Aug 21 23:48 .
drwx------ 3 root root 4.0K Aug 21 23:47 ..
-rw-r--r-- 1 root root 0 Aug 21 23:48 test
```
Within the unit namespace:
```
root@abeltran-test:/var/lib/sampleservice# ls -lah
total 4.0K
drwxr-xr-x 2 63750 63750 4.0K Aug 21 23:48 .
drwxr-xr-x 3 root root 60 Aug 21 23:47 ..
-rw-r--r-- 1 63750 63750 0 Aug 21 23:48 test
```
```
root@abeltran-test:/# mount | grep and
/dev/sda1 on /var/lib/private/andresstatedir type ext4 (rw,nosuid,noexec,relatime,idmapped,discard,errors=remount-ro,commit=30)
```
Ronan Pigott
Zbigniew Jędrzejewski-Szmek
Luca Boccassi
Lennart Poettering
Daan De Meyer
Luca Boccassi
Yu Watanabe
Franck Bui
Colin Foster
Martin Wilck