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From: Markus Frank <m.frank@proxmox.com>
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Subject: [pmg-devel] [PATCH pmg-api v7 3/12] config: add plugin system for
authentication realms
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To differentiate between usernames, the realm is also stored in the
user.conf file. Old config file syntax can be read, but will be
overwritten after a change.
This is a carryover from PVE. Previously there was no realm for a
username. Now the realm is also stored after an @ sign in user.conf.
Utils generates a list of valid realm names, including any newly added
realms, to ensure proper validation of a specified realm name.
Signed-off-by: Markus Frank <m.frank@proxmox.com>
---
v7:
* removed tfa related code
* save realms after the username like in v5: username@realm
src/Makefile | 3 +
src/PMG/API2/Users.pm | 1 +
src/PMG/AccessControl.pm | 38 +++++++
src/PMG/Auth/PAM.pm | 21 ++++
src/PMG/Auth/PMG.pm | 37 +++++++
src/PMG/Auth/Plugin.pm | 202 +++++++++++++++++++++++++++++++++++++
src/PMG/RESTEnvironment.pm | 14 +++
src/PMG/UserConfig.pm | 25 +++--
src/PMG/Utils.pm | 29 ++++--
9 files changed, 354 insertions(+), 16 deletions(-)
create mode 100755 src/PMG/Auth/PAM.pm
create mode 100755 src/PMG/Auth/PMG.pm
create mode 100755 src/PMG/Auth/Plugin.pm
diff --git a/src/Makefile b/src/Makefile
index 1232880..659a666 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -166,6 +166,9 @@ LIBSOURCES = \
PMG/API2/ACMEPlugin.pm \
PMG/API2/NodeConfig.pm \
PMG/API2.pm \
+ PMG/Auth/Plugin.pm \
+ PMG/Auth/PAM.pm \
+ PMG/Auth/PMG.pm \
SOURCES = ${LIBSOURCES} ${CLI_BINARIES} ${TEMPLATES_FILES} ${CONF_MANS} ${CLI_MANS} ${SERVICE_MANS} ${SERVICE_UNITS} ${TIMER_UNITS} pmg-sources.list pmg-initramfs.conf
diff --git a/src/PMG/API2/Users.pm b/src/PMG/API2/Users.pm
index 99af38d..42c82b7 100644
--- a/src/PMG/API2/Users.pm
+++ b/src/PMG/API2/Users.pm
@@ -124,6 +124,7 @@ __PACKAGE__->register_method ({
$entry->{enable} //= 0;
$entry->{expire} //= 0;
$entry->{role} //= 'audit';
+ $entry->{realm} //= 'pmg';
$cfg->{$param->{userid}} = $entry;
diff --git a/src/PMG/AccessControl.pm b/src/PMG/AccessControl.pm
index e12d7cf..78105c0 100644
--- a/src/PMG/AccessControl.pm
+++ b/src/PMG/AccessControl.pm
@@ -5,6 +5,7 @@ use warnings;
use Authen::PAM;
use PVE::Tools;
+use PVE::INotify;
use PVE::JSONSchema qw(get_standard_option);
use PVE::Exception qw(raise raise_perm_exc);
@@ -13,6 +14,14 @@ use PMG::LDAPConfig;
use PMG::LDAPSet;
use PMG::TFAConfig;
+use PMG::Auth::Plugin;
+use PMG::Auth::PAM;
+use PMG::Auth::PMG;
+
+PMG::Auth::PAM->register();
+PMG::Auth::PMG->register();
+PMG::Auth::Plugin->init();
+
sub normalize_path {
my $path = shift;
@@ -38,6 +47,7 @@ sub authenticate_user : prototype($$$) {
($username, $ruid, $realm) = PMG::Utils::verify_username($username);
+ my $realm_regex = PMG::Utils::valid_pmg_realm_regex();
if ($realm eq 'pam') {
die "invalid pam user (only root allowed)\n" if $ruid ne 'root';
authenticate_pam_user($ruid, $password);
@@ -53,6 +63,11 @@ sub authenticate_user : prototype($$$) {
return ($pmail . '@quarantine', undef);
}
die "ldap login failed\n";
+ } elsif ($realm =~ m!(${realm_regex})!) {
+ my $realm_cfg = PVE::INotify::read_file(PMG::Auth::Plugin->realm_cfg_id());
+ my $cfg = $realm_cfg->{ids}->{$realm};
+ my $plugin = PMG::Auth::Plugin->lookup($cfg->{type});
+ $plugin->authenticate_user($cfg, $realm, $ruid, $password);
} else {
die "no such realm '$realm'\n";
}
@@ -79,6 +94,7 @@ sub set_user_password {
($username, $ruid, $realm) = PMG::Utils::verify_username($username);
+ my $realm_regex = PMG::Utils::valid_pmg_realm_regex();
if ($realm eq 'pam') {
die "invalid pam user (only root allowed)\n" if $ruid ne 'root';
@@ -92,6 +108,11 @@ sub set_user_password {
} elsif ($realm eq 'pmg') {
PMG::UserConfig->set_user_password($username, $password);
+ } elsif ($realm =~ m!(${realm_regex})!) {
+ my $realm_cfg = PVE::INotify::read_file(PMG::Auth::Plugin->realm_cfg_id());
+ my $cfg = $realm_cfg->{ids}->{$realm};
+ my $plugin = PMG::Auth::Plugin->lookup($cfg->{type});
+ $plugin->store_password($cfg, $realm, $username, $password);
} else {
die "no such realm '$realm'\n";
}
@@ -106,6 +127,7 @@ sub check_user_enabled {
($username, $ruid, $realm) = PMG::Utils::verify_username($username, 1);
+ my $realm_regex = PMG::Utils::valid_pmg_realm_regex();
if ($realm && $ruid) {
if ($realm eq 'pam') {
return 'root' if $ruid eq 'root';
@@ -115,6 +137,10 @@ sub check_user_enabled {
return $data->{role} if $data && $data->{enable};
} elsif ($realm eq 'quarantine') {
return 'quser';
+ } elsif ($realm =~ m!(${realm_regex})!) {
+ my $usercfg = PMG::UserConfig->new();
+ my $data = $usercfg->lookup_user_data($username, $noerr);
+ return $data->{role} if $data && $data->{enable};
}
}
@@ -123,6 +149,18 @@ sub check_user_enabled {
return undef;
}
+sub check_user_exist {
+ my ($usercfg, $username, $noerr) = @_;
+
+ $username = PMG::Utils::verify_username($username, $noerr);
+ return undef if !$username;
+ return $usercfg->{$username} if $usercfg && $usercfg->{$username};
+
+ die "no such user ('$username')\n" if !$noerr;
+
+ return undef;
+}
+
sub authenticate_pam_user {
my ($username, $password) = @_;
diff --git a/src/PMG/Auth/PAM.pm b/src/PMG/Auth/PAM.pm
new file mode 100755
index 0000000..002c8e1
--- /dev/null
+++ b/src/PMG/Auth/PAM.pm
@@ -0,0 +1,21 @@
+package PMG::Auth::PAM;
+
+use strict;
+use warnings;
+
+use PMG::Auth::Plugin;
+
+use base qw(PMG::Auth::Plugin);
+
+sub type {
+ return 'pam';
+}
+
+sub options {
+ return {
+ default => { optional => 1 },
+ comment => { optional => 1 },
+ };
+}
+
+1;
diff --git a/src/PMG/Auth/PMG.pm b/src/PMG/Auth/PMG.pm
new file mode 100755
index 0000000..0706c97
--- /dev/null
+++ b/src/PMG/Auth/PMG.pm
@@ -0,0 +1,37 @@
+package PMG::Auth::PMG;
+
+use strict;
+use warnings;
+
+use PMG::Auth::Plugin;
+
+use base qw(PMG::Auth::Plugin);
+
+sub type {
+ return 'pmg';
+}
+
+sub properties {
+ return {
+ default => {
+ description => "Use this as default realm",
+ type => 'boolean',
+ optional => 1,
+ },
+ comment => {
+ description => "Description.",
+ type => 'string',
+ optional => 1,
+ maxLength => 4096,
+ },
+ };
+}
+
+sub options {
+ return {
+ default => { optional => 1 },
+ comment => { optional => 1 },
+ };
+}
+
+1;
diff --git a/src/PMG/Auth/Plugin.pm b/src/PMG/Auth/Plugin.pm
new file mode 100755
index 0000000..beb8fc4
--- /dev/null
+++ b/src/PMG/Auth/Plugin.pm
@@ -0,0 +1,202 @@
+package PMG::Auth::Plugin;
+
+use strict;
+use warnings;
+
+use Digest::SHA;
+use Encode;
+
+use PMG::Utils;
+use PVE::INotify;
+use PVE::JSONSchema qw(get_standard_option);
+use PVE::SectionConfig;
+use PVE::Tools;
+
+use base qw(PVE::SectionConfig);
+
+my $realm_cfg_id = "realms.cfg";
+my $lockfile = "/var/lock/pmg-realms.lck";
+
+sub realm_cfg_id {
+ return $realm_cfg_id;
+}
+
+sub read_realms_conf {
+ my ($filename, $fh) = @_;
+
+ my $raw;
+ $raw = do { local $/ = undef; <$fh> } if defined($fh);
+
+ return PMG::Auth::Plugin->parse_config($filename, $raw);
+}
+
+sub write_realms_conf {
+ my ($filename, $fh, $cfg) = @_;
+
+ my $raw = PMG::Auth::Plugin->write_config($filename, $cfg);
+
+ PVE::Tools::safe_print($filename, $fh, $raw);
+}
+
+PVE::INotify::register_file(
+ $realm_cfg_id,
+ "/etc/pmg/realms.cfg",
+ \&read_realms_conf,
+ \&write_realms_conf,
+ undef,
+ always_call_parser => 1,
+);
+
+sub lock_realm_config {
+ my ($code, $errmsg) = @_;
+
+ PVE::Tools::lock_file($lockfile, undef, $code);
+ if (my $err = $@) {
+ $errmsg ? die "$errmsg: $err" : die $err;
+ }
+}
+
+my $realm_regex = qr/[A-Za-z][A-Za-z0-9\.\-_]+/;
+
+sub pmg_verify_realm {
+ my ($realm, $noerr) = @_;
+
+ if ($realm !~ m/^${realm_regex}$/) {
+ return undef if $noerr;
+ die "value does not look like a valid realm\n";
+ }
+ return $realm;
+}
+
+my $defaultData = {
+ propertyList => {
+ type => { description => "Realm type." },
+ realm => get_standard_option('realm'),
+ },
+};
+
+sub private {
+ return $defaultData;
+}
+
+sub parse_section_header {
+ my ($class, $line) = @_;
+
+ if ($line =~ m/^(\S+):\s*(\S+)\s*$/) {
+ my ($type, $realm) = (lc($1), $2);
+ my $errmsg = undef; # set if you want to skip whole section
+ eval { pmg_verify_realm($realm); };
+ $errmsg = $@ if $@;
+ my $config = {}; # to return additional attributes
+ return ($type, $realm, $errmsg, $config);
+ }
+ return undef;
+}
+
+sub parse_config {
+ my ($class, $filename, $raw) = @_;
+
+ my $cfg = $class->SUPER::parse_config($filename, $raw);
+
+ my $default;
+ foreach my $realm (keys %{$cfg->{ids}}) {
+ my $data = $cfg->{ids}->{$realm};
+ # make sure there is only one default marker
+ if ($data->{default}) {
+ if ($default) {
+ delete $data->{default};
+ } else {
+ $default = $realm;
+ }
+ }
+
+ if ($data->{comment}) {
+ $data->{comment} = PVE::Tools::decode_text($data->{comment});
+ }
+
+ }
+
+ # add default realms
+ $cfg->{ids}->{pmg}->{type} = 'pmg'; # force type
+ $cfg->{ids}->{pmg}->{comment} = "Proxmox Mail Gateway authentication server"
+ if !$cfg->{ids}->{pmg}->{comment};
+ $cfg->{ids}->{pmg}->{default} = 1
+ if !$cfg->{ids}->{pmg}->{default};
+
+ $cfg->{ids}->{pam}->{type} = 'pam'; # force type
+ $cfg->{ids}->{pam}->{comment} = "Linux PAM standard authentication"
+ if !$cfg->{ids}->{pam}->{comment};
+
+ return $cfg;
+};
+
+sub write_config {
+ my ($class, $filename, $cfg) = @_;
+
+ foreach my $realm (keys %{$cfg->{ids}}) {
+ my $data = $cfg->{ids}->{$realm};
+ if ($data->{comment}) {
+ $data->{comment} = PVE::Tools::encode_text($data->{comment});
+ }
+ }
+
+ $class->SUPER::write_config($filename, $cfg);
+}
+
+sub authenticate_user {
+ my ($class, $config, $realm, $username, $password) = @_;
+
+ die "overwrite me";
+}
+
+sub store_password {
+ my ($class, $config, $realm, $username, $password) = @_;
+
+ my $type = $class->type();
+
+ die "can't set password on auth type '$type'\n";
+}
+
+sub delete_user {
+ my ($class, $config, $realm, $username) = @_;
+
+ # do nothing by default
+}
+
+# called during addition of realm (before the new realm config got written)
+# `password` is moved to %param to avoid writing it out to the config
+# die to abort addition if there are (grave) problems
+# NOTE: runs in a realm config *locked* context
+sub on_add_hook {
+ my ($class, $realm, $config, %param) = @_;
+ # do nothing by default
+}
+
+# called during realm configuration update (before the updated realm config got
+# written). `password` is moved to %param to avoid writing it out to the config
+# die to abort the update if there are (grave) problems
+# NOTE: runs in a realm config *locked* context
+sub on_update_hook {
+ my ($class, $realm, $config, %param) = @_;
+ # do nothing by default
+}
+
+# called during deletion of realms (before the new realm config got written)
+# and if the activate check on addition fails, to cleanup all storage traces
+# which on_add_hook may have created.
+# die to abort deletion if there are (very grave) problems
+# NOTE: runs in a realm config *locked* context
+sub on_delete_hook {
+ my ($class, $realm, $config) = @_;
+ # do nothing by default
+}
+
+# called during addition and updates of realms (before the new realm config gets written)
+# die to abort addition/update in case the connection/bind fails
+# NOTE: runs in a realm config *locked* context
+sub check_connection {
+ my ($class, $realm, $config, %param) = @_;
+ # do nothing by default
+}
+
+1;
diff --git a/src/PMG/RESTEnvironment.pm b/src/PMG/RESTEnvironment.pm
index 3875720..f6ff449 100644
--- a/src/PMG/RESTEnvironment.pm
+++ b/src/PMG/RESTEnvironment.pm
@@ -88,6 +88,20 @@ sub get_role {
return $self->{role};
}
+sub check_user_enabled {
+ my ($self, $user, $noerr) = @_;
+
+ my $cfg = $self->{usercfg};
+ return PMG::AccessControl::check_user_enabled($cfg, $user, $noerr);
+}
+
+sub check_user_exist {
+ my ($self, $user, $noerr) = @_;
+
+ my $cfg = $self->{usercfg};
+ return PMG::AccessControl::check_user_exist($cfg, $user, $noerr);
+}
+
sub check_node_is_master {
my ($self, $noerr);
diff --git a/src/PMG/UserConfig.pm b/src/PMG/UserConfig.pm
index b9a83a7..fe6d2c8 100644
--- a/src/PMG/UserConfig.pm
+++ b/src/PMG/UserConfig.pm
@@ -80,7 +80,7 @@ my $schema = {
realm => {
description => "Authentication realm.",
type => 'string',
- enum => ['pam', 'pmg'],
+ format => 'pmg-realm',
default => 'pmg',
optional => 1,
},
@@ -219,10 +219,13 @@ sub read_user_conf {
(?<keys>(?:[^:]*)) :
$/x
) {
+ my @username_parts = split('@', $+{userid});
+ my $username = $username_parts[0];
+ my $realm = defined($username_parts[1]) ? $username_parts[1] : "pmg";
my $d = {
- username => $+{userid},
- userid => $+{userid} . '@pmg',
- realm => 'pmg',
+ username => $username,
+ userid => $username . '@' . $realm,
+ realm => $realm,
enable => $+{enable} || 0,
expire => $+{expire} || 0,
role => $+{role},
@@ -235,8 +238,9 @@ sub read_user_conf {
eval {
$verify_entry->($d);
$cfg->{$d->{userid}} = $d;
- die "role 'root' is reserved\n"
- if $d->{role} eq 'root' && $d->{userid} ne 'root@pmg';
+ if ($d->{role} eq 'root' && $d->{userid} !~ /^root@(pmg|pam)$/) {
+ die "role 'root' is reserved\n";
+ }
};
if (my $err = $@) {
warn "$filename: $err";
@@ -274,22 +278,23 @@ sub write_user_conf {
$verify_entry->($d);
$cfg->{$d->{userid}} = $d;
+ my $realm_regex = PMG::Utils::valid_pmg_realm_regex();
if ($d->{userid} ne 'root@pam') {
die "role 'root' is reserved\n" if $d->{role} eq 'root';
die "unable to add users for realm '$d->{realm}'\n"
- if $d->{realm} && $d->{realm} ne 'pmg';
+ if $d->{realm} && $d->{realm} !~ m!(${realm_regex})!;
}
my $line;
if ($userid eq 'root@pam') {
- $line = 'root:';
+ $line = 'root@pam:';
$d->{crypt_pass} = '',
$d->{expire} = '0',
$d->{role} = 'root';
} else {
- next if $userid !~ m/^(?<username>.+)\@pmg$/;
- $line = "$+{username}:";
+ next if $userid !~ m/^(?<username>.+)\@(${realm_regex})$/;
+ $line = "$d->{userid}:";
}
for my $k (qw(enable expire crypt_pass role email firstname lastname keys)) {
diff --git a/src/PMG/Utils.pm b/src/PMG/Utils.pm
index 0b8945f..04a3a2e 100644
--- a/src/PMG/Utils.pm
+++ b/src/PMG/Utils.pm
@@ -49,12 +49,30 @@ postgres_admin_cmd
try_decode_utf8
);
-my $valid_pmg_realms = ['pam', 'pmg', 'quarantine'];
+my $user_regex = qr![^\s:/]+!;
+
+sub valid_pmg_realm_regex {
+ my $cfg = PVE::INotify::read_file('realms.cfg');
+ my $ids = $cfg->{ids};
+ my $realms = ['pam', 'quarantine', sort keys $cfg->{ids}->%* ];
+ return join('|', @$realms);
+}
+
+sub is_valid_realm {
+ my ($realm) = @_;
+ return 0 if !$realm;
+ return 1 if $realm eq 'pam' || $realm eq 'quarantine'; # built-in ones
+
+ my $cfg = PVE::INotify::read_file('realms.cfg');
+ return exists($cfg->{ids}->{$realm}) ? 1 : 0;
+}
+
+PVE::JSONSchema::register_format('pmg-realm', \&is_valid_realm);
PVE::JSONSchema::register_standard_option('realm', {
description => "Authentication domain ID",
type => 'string',
- enum => $valid_pmg_realms,
+ format => 'pmg-realm',
maxLength => 32,
});
@@ -82,16 +100,15 @@ sub verify_username {
die "user name '$username' is too short\n" if !$noerr;
return undef;
}
- if ($len > 64) {
- die "user name '$username' is too long ($len > 64)\n" if !$noerr;
+ if ($len > 128) {
+ die "user name '$username' is too long ($len > 128)\n" if !$noerr;
return undef;
}
# we only allow a limited set of characters. Colons aren't allowed, because we store usernames
# with colon separated lists! slashes aren't allowed because it is used as pve API delimiter
# also see "man useradd"
- my $realm_list = join('|', @$valid_pmg_realms);
- if ($username =~ m!^([^\s:/]+)\@(${realm_list})$!) {
+ if ($username =~ m!^(${user_regex})\@([A-Za-z][A-Za-z0-9\.\-_]+)$!) {
return wantarray ? ($username, $1, $2) : $username;
}
--
2.39.5
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