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Author SHA1 Message Date
Lennart Poettering 0dabc79dd3
Merge 28a591e192 into d99198819c 2024-11-22 04:33:17 +01:00
Lennart Poettering 28a591e192 pam-systemd: talk to logind via varlink
This makes sure we now use Varlink per default as transport for
allocating sessions.

This reduces the time it takes to do one run0 cycle by roughly ~10% on my
completely synthetic test setup (assuming the target user's service
manager is already started)

The D-Bus codepaths are kept in place for two reasons:
* To make upgrades easy
* If the user actually sets resource properties on the PAM session we
  fall back to the D-Bus codepaths, as we currently have no way to
  encode the scope properties in JSON, this is only supported for D-Bus
  serialization.

The latter should be revisited once it is possible to allocate a scope
unit from PID1 via varlink.
2024-11-21 15:24:24 +01:00
Lennart Poettering cbbf4f1bc0 logind: add basic Varlink API
For now this only covers CreateSession() and ReleaseSession(), i.e. the
two operations pam_systemd cares about.
2024-11-21 12:06:56 +01:00
Lennart Poettering f402bf0249 logind: split create session reply handling in two
This prepares ground so that later on we can reply with either D-Bus or
Varlink depending on the client's request.
2024-11-21 12:06:53 +01:00
Lennart Poettering 5820a3110a logind: also potentially GC the session if we cannot send reply 2024-11-21 12:06:50 +01:00
Lennart Poettering 57980e639e logind: indicate that 'error' parameter is input by making it const 2024-11-21 12:06:46 +01:00
Lennart Poettering 349ed71b02 logind: rework session creation logic, to be more reusable for varlink codepaths
This separates the preparatory checks that generate D-Bus errors from
the code that actually allocates the session. This make the logic easier
to follow and prepares ground so that we can reuse the 2nd part later
when exposing session creation via Varlink.
2024-11-21 12:06:43 +01:00
Lennart Poettering fa98d06a59 logind: split out logic that finds free session ID into helper call
Just some refactoring to make an overly large function a bit smaller.
2024-11-21 12:06:39 +01:00
Lennart Poettering 4dc2a994bd logind: normalize parameter to create_session()
We can pass a properly typed Manager object here, no reason to pass it
as void*.
2024-11-21 12:06:36 +01:00
Lennart Poettering b6c3118315 sd-varlink: fix bug when enqueuing messages with fds asynchronously
When determining the poll events to wait for we need to take the queue
of pending messages that carry fds into account. Otherwise we might end
up not waking up if such an fd-carrying message is enqueued
asynchronously (i.e. not from a dispatch callback).
2024-11-21 12:06:33 +01:00
Lennart Poettering a3ab6ede95 sd-varlink: add flag for sd_varlink_server for creating connections with fd passing enabled
Let's add a simple flag that enables fd passing for all connections of a
server. It's much easier to use this than to install a connect handler
which manually enables this for each connection.
2024-11-21 12:06:26 +01:00
Lennart Poettering af748aba2f terminal-util: modernize vtnr_from_tty() a bit 2024-11-21 12:06:19 +01:00
Lennart Poettering 482bbb932f sd-login: make use of getpeerpidref() and cg_pidref_get_*() 2024-11-21 12:06:16 +01:00
Lennart Poettering 8808bcf68b socket-util: introduce getpeerpidref()
This combines getpeercred() and getpeerpidfd() and returns a PidRef
2024-11-21 12:06:02 +01:00
Lennart Poettering 894fb2b1b4 cgroup-util: add pidref counterparts for cg_pid_get_session() + cg_pid_get_owner_uid() 2024-11-21 12:05:45 +01:00
Lennart Poettering a088ebfcf5 tree-wide: use pidref_is_self() at more places 2024-11-21 12:05:42 +01:00
Lennart Poettering dc997664b6 sd-json: add json_dispatch_const_path() helper
The new json_dispatch_const_path() is to json_dispatch_path() what
sd_json_dispatch_const_string() is to sd_json_dispatch_ string(), i.e.
doesn't implicitly strdup() the string, but gives you the pointer into
the JSON structure, and thus requires you to keep it pinned.
2024-11-21 12:05:28 +01:00
Lennart Poettering 8baa1059ba pam_systemd: introduce pam_get_data_many() helper and make use of it
This is to pam_get_data() what pam_get_item() is to pam_get_item_many().
2024-11-21 12:05:13 +01:00
Lennart Poettering 5a140b38f6 pam_systemd: fix error code confusion when prepping D-Bus message
We got confused by the error codes here, and sometimes return PAM errors
where the caller propagated them unconverted as negative errno errors. Fix that.
2024-11-21 12:05:10 +01:00
Lennart Poettering 0a9ab33875 pam_systemd: split pam_sm_open_session() into more digestable blocks
Let's separate four different parts of pam_sm_open_session():

1. Acquiring of our various parameters from pam env, pam data, pam items
2. Mangling of that data to clean it up
3. Registering of the service with logind
4. Importing shell credentials into environment variables
5. Enforcement of user record data

This makes the code a lot more readable, and gets rid of an ugly got
label.

It also corrects things: if step 3 doesnt work because logind is not
around, we'll now still do step 4, which we previously erroneously
skipped.

Besodes that no real code changes.
2024-11-21 12:05:07 +01:00
Lennart Poettering 174829c534 pam_systemd: split out setting of shell env vars from credentials and move it later
Let's shorten the code of pam_sm_open_session() a bit, and also make
sure the importing of the env vars from the creds also happens if the
session registration with logind is skipped.
2024-11-21 12:05:03 +01:00
Lennart Poettering a047e131df pam_systemd: drop "uid" field from SessionContext
Let's instead just pass over the UserRecord, it's a much more useful
object with lots more information we'll sooner or later need
(preparation for later commits).
2024-11-21 12:05:00 +01:00
Lennart Poettering 422c880e22 pam_systemd: drop "pid" field from SessionContext
We never use the field and this is not going to change...

This addresses a weird asymmetry, as create_session_message() always
went to the process' own PID when doing pidfds but otherwise (i.e.
without pidfds) would honour the PID specified as function parameter.
2024-11-21 12:04:56 +01:00
Lennart Poettering f79c8a3e34 pam-systemd: normalize parsing of XDG_VTNR
Let's make it more like the parsing of the "incomplete" boolean env var,
to streamline things.
2024-11-21 12:04:34 +01:00
5 changed files with 35 additions and 69 deletions

View File

@ -265,11 +265,32 @@
</refsect1> </refsect1>
<refsect1> <refsect1>
<title>Unlocking</title> <title>Options</title>
<para>The following options are understood that may be used to unlock the device in preparation of the enrollment operations:</para> <para>The following options are understood:</para>
<variablelist> <variablelist>
<varlistentry>
<term><option>--password</option></term>
<listitem><para>Enroll a regular password/passphrase. This command is mostly equivalent to
<command>cryptsetup luksAddKey</command>, however may be combined with
<option>--wipe-slot=</option> in one call, see below.</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
</varlistentry>
<varlistentry>
<term><option>--recovery-key</option></term>
<listitem><para>Enroll a recovery key. Recovery keys are mostly identical to passphrases, but are
computer-generated instead of being chosen by a human, and thus have a guaranteed high entropy. The
key uses a character set that is easy to type in, and may be scanned off screen via a QR code.
</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
</varlistentry>
<varlistentry> <varlistentry>
<term><option>--unlock-key-file=<replaceable>PATH</replaceable></option></term> <term><option>--unlock-key-file=<replaceable>PATH</replaceable></option></term>
@ -307,45 +328,7 @@
<xi:include href="version-info.xml" xpointer="v256"/></listitem> <xi:include href="version-info.xml" xpointer="v256"/></listitem>
</varlistentry> </varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Simple Enrollment</title>
<para>The following options are understood that may be used to enroll simple user input based
unlocking:</para>
<variablelist>
<varlistentry>
<term><option>--password</option></term>
<listitem><para>Enroll a regular password/passphrase. This command is mostly equivalent to
<command>cryptsetup luksAddKey</command>, however may be combined with
<option>--wipe-slot=</option> in one call, see below.</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
</varlistentry>
<varlistentry>
<term><option>--recovery-key</option></term>
<listitem><para>Enroll a recovery key. Recovery keys are mostly identical to passphrases, but are
computer-generated instead of being chosen by a human, and thus have a guaranteed high entropy. The
key uses a character set that is easy to type in, and may be scanned off screen via a QR code.
</para>
<xi:include href="version-info.xml" xpointer="v248"/></listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>PKCS#11 Enrollment</title>
<para>The following option is understood that may be used to enroll PKCS#11 tokens:</para>
<variablelist>
<varlistentry> <varlistentry>
<term><option>--pkcs11-token-uri=<replaceable>URI</replaceable></option></term> <term><option>--pkcs11-token-uri=<replaceable>URI</replaceable></option></term>
@ -378,15 +361,7 @@
<xi:include href="version-info.xml" xpointer="v248"/></listitem> <xi:include href="version-info.xml" xpointer="v248"/></listitem>
</varlistentry> </varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>FIDO2 Enrollment</title>
<para>The following options are understood that may be used to enroll PKCS#11 tokens:</para>
<variablelist>
<varlistentry> <varlistentry>
<term><option>--fido2-credential-algorithm=<replaceable>STRING</replaceable></option></term> <term><option>--fido2-credential-algorithm=<replaceable>STRING</replaceable></option></term>
<listitem><para>Specify COSE algorithm used in credential generation. The default value is <listitem><para>Specify COSE algorithm used in credential generation. The default value is
@ -486,15 +461,7 @@
<xi:include href="version-info.xml" xpointer="v249"/></listitem> <xi:include href="version-info.xml" xpointer="v249"/></listitem>
</varlistentry> </varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>TPM2 Enrollment</title>
<para>The following options are understood that may be used to enroll TPM2 devices:</para>
<variablelist>
<varlistentry> <varlistentry>
<term><option>--tpm2-device=<replaceable>PATH</replaceable></option></term> <term><option>--tpm2-device=<replaceable>PATH</replaceable></option></term>
@ -669,15 +636,7 @@
<xi:include href="version-info.xml" xpointer="v255"/></listitem> <xi:include href="version-info.xml" xpointer="v255"/></listitem>
</varlistentry> </varlistentry>
</variablelist>
</refsect1>
<refsect1>
<title>Other Options</title>
<para>The following additional options are understood:</para>
<variablelist>
<varlistentry> <varlistentry>
<term><option>--wipe-slot=<replaceable>SLOT<optional>,SLOT...</optional></replaceable></option></term> <term><option>--wipe-slot=<replaceable>SLOT<optional>,SLOT...</optional></replaceable></option></term>

View File

@ -38,12 +38,19 @@ __get_tpm2_devices() {
done done
} }
__get_block_devices() {
local i
for i in /dev/*; do
[ -b "$i" ] && printf '%s\n' "$i"
done
}
_systemd_cryptenroll() { _systemd_cryptenroll() {
local comps local comps
local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} words cword local cur=${COMP_WORDS[COMP_CWORD]} prev=${COMP_WORDS[COMP_CWORD-1]} words cword
local -A OPTS=( local -A OPTS=(
[STANDALONE]='-h --help --version [STANDALONE]='-h --help --version
--password --recovery-key --list-devices' --password --recovery-key'
[ARG]='--unlock-key-file [ARG]='--unlock-key-file
--unlock-fido2-device --unlock-fido2-device
--unlock-tpm2-device --unlock-tpm2-device
@ -109,7 +116,7 @@ _systemd_cryptenroll() {
return 0 return 0
fi fi
comps=$(systemd-cryptenroll --list-devices) comps=$(__get_block_devices)
COMPREPLY=( $(compgen -W '$comps' -- "$cur") ) COMPREPLY=( $(compgen -W '$comps' -- "$cur") )
return 0 return 0
} }

View File

@ -983,7 +983,7 @@ int getpeerpidref(int fd, PidRef *ret) {
int pidfd = getpeerpidfd(fd); int pidfd = getpeerpidfd(fd);
if (pidfd < 0) { if (pidfd < 0) {
if (!ERRNO_IS_NEG_NOT_SUPPORTED(pidfd) && pidfd != -EINVAL) if (!ERRNO_IS_NEG_NOT_SUPPORTED(pidfd))
return pidfd; return pidfd;
struct ucred ucred; struct ucred ucred;

View File

@ -193,7 +193,7 @@ static int help(void) {
"\n%3$sSimple Enrollment:%4$s\n" "\n%3$sSimple Enrollment:%4$s\n"
" --password Enroll a user-supplied password\n" " --password Enroll a user-supplied password\n"
" --recovery-key Enroll a recovery key\n" " --recovery-key Enroll a recovery key\n"
"\n%3$sPKCS#11 Enrollment:%4$s\n" "\n%3$sPKCS11 Enrollment:%4$s\n"
" --pkcs11-token-uri=URI\n" " --pkcs11-token-uri=URI\n"
" Specify PKCS#11 security token URI\n" " Specify PKCS#11 security token URI\n"
"\n%3$sFIDO2 Enrollment:%4$s\n" "\n%3$sFIDO2 Enrollment:%4$s\n"

View File

@ -16,7 +16,7 @@ int varlink_get_peer_pidref(sd_varlink *v, PidRef *ret) {
int pidfd = sd_varlink_get_peer_pidfd(v); int pidfd = sd_varlink_get_peer_pidfd(v);
if (pidfd < 0) { if (pidfd < 0) {
if (!ERRNO_IS_NEG_NOT_SUPPORTED(pidfd) && pidfd != -EINVAL) if (!ERRNO_IS_NEG_NOT_SUPPORTED(pidfd))
return pidfd; return pidfd;
pid_t pid; pid_t pid;