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Merge pull request #95294 from aanderse/postgresql-rootless

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nixos/postgresql: run ExecStartPost as an unprivileged user
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Aaron Andersen 2020-08-20 19:16:23 -04:00 committed by GitHub
commit b87b6abd17
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2 changed files with 43 additions and 39 deletions
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10
nixos/doc/manual/release-notes/rl-2009.xml
View file

@ -676,11 +676,19 @@ services.dokuwiki."mywiki" = {
<listitem>
<para>
The <xref linkend="opt-services.postgresql.dataDir"/> option is now set to <literal>"/var/lib/postgresql/${cfg.package.psqlSchema}"</literal> regardless of your
<xref linkend="opt-system.stateVersion"/>. Users with an existing postgresql install that have a <xref linkend="opt-system.stateVersion"/> of <literal>17.09</literal> or below
<xref linkend="opt-system.stateVersion"/>. Users with an existing postgresql install that have a <xref linkend="opt-system.stateVersion"/> of <literal>17.03</literal> or below
should double check what the value of their <xref linkend="opt-services.postgresql.dataDir"/> option is (<literal>/var/db/postgresql</literal>) and then explicitly
set this value to maintain compatibility:
<programlisting>
services.postgresql.dataDir = "/var/db/postgresql";
</programlisting>
</para>
<para>
The postgresql module now expects there to be a database super user account called <literal>postgres</literal> regardless of your <xref linkend="opt-system.stateVersion"/>. Users
with an existing postgresql install that have a <xref linkend="opt-system.stateVersion"/> of <literal>17.03</literal> or below should run the following SQL statements as a
database super admin user before upgrading:
<programlisting>
CREATE ROLE postgres LOGIN SUPERUSER;
</programlisting>
</para>
</listitem>

72
nixos/modules/services/databases/postgresql.nix
View file

@ -225,14 +225,15 @@ in
Contents of the <filename>recovery.conf</filename> file.
'';
};
superUser = mkOption {
type = types.str;
default= if versionAtLeast config.system.stateVersion "17.09" then "postgres" else "root";
default = "postgres";
internal = true;
readOnly = true;
description = ''
NixOS traditionally used 'root' as superuser, most other distros use 'postgres'.
From 17.09 we also try to follow this standard. Internal since changing this value
would lead to breakage while setting up databases.
PostgreSQL superuser account to use for various operations. Internal since changing
this value would lead to breakage while setting up databases.
'';
};
};
@ -310,6 +311,35 @@ in
''}
'';
# Wait for PostgreSQL to be ready to accept connections.
postStart =
''
PSQL="psql --port=${toString cfg.port}"
while ! $PSQL -d postgres -c "" 2> /dev/null; do
if ! kill -0 "$MAINPID"; then exit 1; fi
sleep 0.1
done
if test -e "${cfg.dataDir}/.first_startup"; then
${optionalString (cfg.initialScript != null) ''
$PSQL -f "${cfg.initialScript}" -d postgres
''}
rm -f "${cfg.dataDir}/.first_startup"
fi
'' + optionalString (cfg.ensureDatabases != []) ''
${concatMapStrings (database: ''
$PSQL -tAc "SELECT 1 FROM pg_database WHERE datname = '${database}'" | grep -q 1 || $PSQL -tAc 'CREATE DATABASE "${database}"'
'') cfg.ensureDatabases}
'' + ''
${concatMapStrings (user: ''
$PSQL -tAc "SELECT 1 FROM pg_roles WHERE rolname='${user.name}'" | grep -q 1 || $PSQL -tAc 'CREATE USER "${user.name}"'
${concatStringsSep "\n" (mapAttrsToList (database: permission: ''
$PSQL -tAc 'GRANT ${permission} ON ${database} TO "${user.name}"'
'') user.ensurePermissions)}
'') cfg.ensureUsers}
'';
serviceConfig = mkMerge [
{ ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
User = "postgres";
@ -329,40 +359,6 @@ in
TimeoutSec = 120;
ExecStart = "${postgresql}/bin/postgres";
# Wait for PostgreSQL to be ready to accept connections.
ExecStartPost =
let
setupScript = pkgs.writeScript "postgresql-setup" (''
#!${pkgs.runtimeShell} -e
PSQL="${pkgs.utillinux}/bin/runuser -u ${cfg.superUser} -- psql --port=${toString cfg.port}"
while ! $PSQL -d postgres -c "" 2> /dev/null; do
if ! kill -0 "$MAINPID"; then exit 1; fi
sleep 0.1
done
if test -e "${cfg.dataDir}/.first_startup"; then
${optionalString (cfg.initialScript != null) ''
$PSQL -f "${cfg.initialScript}" -d postgres
''}
rm -f "${cfg.dataDir}/.first_startup"
fi
'' + optionalString (cfg.ensureDatabases != []) ''
${concatMapStrings (database: ''
$PSQL -tAc "SELECT 1 FROM pg_database WHERE datname = '${database}'" | grep -q 1 || $PSQL -tAc 'CREATE DATABASE "${database}"'
'') cfg.ensureDatabases}
'' + ''
${concatMapStrings (user: ''
$PSQL -tAc "SELECT 1 FROM pg_roles WHERE rolname='${user.name}'" | grep -q 1 || $PSQL -tAc 'CREATE USER "${user.name}"'
${concatStringsSep "\n" (mapAttrsToList (database: permission: ''
$PSQL -tAc 'GRANT ${permission} ON ${database} TO "${user.name}"'
'') user.ensurePermissions)}
'') cfg.ensureUsers}
'');
in
"+${setupScript}";
}
(mkIf (cfg.dataDir == "/var/lib/postgresql/${cfg.package.psqlSchema}") {
StateDirectory = "postgresql postgresql/${cfg.package.psqlSchema}";