[pmg-devel] [PATCH v2 api 2/8] add PMG::CertHelpers module

[Wolfgang Bumiller <w.bumiller@proxmox.com>]

Contains helpers to update certificates and provide locking
for certificates and when accessing acme accounts.

Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
Changes since v1:
* die in both lock helpers on error

 src/Makefile           |   1 +
 src/PMG/CertHelpers.pm | 182 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 183 insertions(+)
 create mode 100644 src/PMG/CertHelpers.pm

diff --git a/src/Makefile b/src/Makefile
index 8891a3c..c1d4812 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -55,6 +55,7 @@ LIBSOURCES =				\
 	PMG/HTMLMail.pm			\
 	PMG/ModGroup.pm			\
 	PMG/SMTPPrinter.pm		\
+	PMG/CertHelpers.pm		\
 	PMG/Config.pm			\
 	PMG/Cluster.pm			\
 	PMG/ClusterConfig.pm		\
diff --git a/src/PMG/CertHelpers.pm b/src/PMG/CertHelpers.pm
new file mode 100644
index 0000000..56b25f7
--- /dev/null
+++ b/src/PMG/CertHelpers.pm
@@ -0,0 +1,182 @@
+package PMG::CertHelpers;
+
+use strict;
+use warnings;
+
+use PVE::Certificate;
+use PVE::JSONSchema;
+use PVE::Tools;
+
+use constant {
+    API_CERT => '/etc/pmg/pmg-api.pem',
+    SMTP_CERT => '/etc/pmg/pmg-tls.pem',
+};
+
+my $account_prefix = '/etc/pmg/acme';
+
+# TODO: Move `pve-acme-account-name` to common and reuse instead of this.
+PVE::JSONSchema::register_standard_option('pmg-acme-account-name', {
+    description => 'ACME account config file name.',
+    type => 'string',
+    format => 'pve-configid',
+    format_description => 'name',
+    optional => 1,
+    default => 'default',
+});
+
+PVE::JSONSchema::register_standard_option('pmg-acme-account-contact', {
+    type => 'string',
+    format => 'email-list',
+    description => 'Contact email addresses.',
+});
+
+PVE::JSONSchema::register_standard_option('pmg-acme-directory-url', {
+    type => 'string',
+    description => 'URL of ACME CA directory endpoint.',
+    pattern => '^https?://.*',
+});
+
+PVE::JSONSchema::register_format('pmg-certificate-type', sub {
+    my ($type, $noerr) = @_;
+
+    if ($type =~ /^(?: api | smtp )$/x) {
+	return $type;
+    }
+    return undef if $noerr;
+    die "value '$type' does not look like a valid certificate type\n";
+});
+
+PVE::JSONSchema::register_standard_option('pmg-certificate-type', {
+    type => 'string',
+    description => 'The TLS certificate type (API or SMTP certificate).',
+    enum => ['api', 'smtp'],
+});
+
+PVE::JSONSchema::register_format('pmg-acme-domain', sub {
+    my ($domain, $noerr) = @_;
+
+    my $label = qr/[a-z0-9][a-z0-9_-]*/i;
+
+    return $domain if $domain =~ /^$label(?:\.$label)+$/;
+    return undef if $noerr;
+    die "value '$domain' does not look like a valid domain name!\n";
+});
+
+PVE::JSONSchema::register_format('pmg-acme-alias', sub {
+    my ($alias, $noerr) = @_;
+
+    my $label = qr/[a-z0-9_][a-z0-9_-]*/i;
+
+    return $alias if $alias =~ /^$label(?:\.$label)+$/;
+    return undef if $noerr;
+    die "value '$alias' does not look like a valid alias name!\n";
+});
+
+my $local_cert_lock = '/var/lock/pmg-certs.lock';
+my $local_acme_lock = '/var/lock/pmg-acme.lock';
+
+sub cert_path : prototype($) {
+    my ($type) = @_;
+    if ($type eq 'api') {
+	return API_CERT;
+    } elsif ($type eq 'smtp') {
+	return SMTP_CERT;
+    } else {
+	die "unknown certificate type '$type'\n";
+    }
+}
+
+sub cert_lock {
+    my ($timeout, $code, @param) = @_;
+
+    my $res = PVE::Tools::lock_file($local_cert_lock, $timeout, $code, @param);
+    die $@ if $@;
+    return $res;
+}
+
+sub set_cert_file {
+    my ($cert, $cert_path, $force) = @_;
+
+    my ($old_cert, $info);
+
+    my $cert_path_old = "${cert_path}.old";
+
+    die "Custom certificate file exists but force flag is not set.\n"
+	if !$force && -e $cert_path;
+
+    PVE::Tools::file_copy($cert_path, $cert_path_old) if -e $cert_path;
+
+    eval {
+	my $gid = undef;
+	if ($cert_path eq &API_CERT) {
+	    $gid = getgrnam('www-data') ||
+		die "user www-data not in group file\n";
+	}
+
+	if (defined($gid)) {
+	    my $cert_path_tmp = "${cert_path}.tmp";
+	    PVE::Tools::file_set_contents($cert_path_tmp, $cert, 0640);
+	    if (!chown(-1, $gid, $cert_path_tmp)) {
+		my $msg =
+		    "failed to change group ownership of '$cert_path_tmp' to www-data ($gid): $!\n";
+		unlink($cert_path_tmp);
+		die $msg;
+	    }
+	    if (!rename($cert_path_tmp, $cert_path)) {
+		my $msg =
+		    "failed to rename '$cert_path_tmp' to '$cert_path': $!\n";
+		unlink($cert_path_tmp);
+		die $msg;
+	    }
+	} else {
+	    PVE::Tools::file_set_contents($cert_path, $cert, 0600);
+	}
+
+	$info = PVE::Certificate::get_certificate_info($cert_path);
+    };
+    my $err = $@;
+
+    if ($err) {
+	if (-e $cert_path_old) {
+	    eval {
+		warn "Attempting to restore old certificate file..\n";
+		PVE::Tools::file_copy($cert_path_old, $cert_path);
+	    };
+	    warn "$@\n" if $@;
+	}
+	die "Setting certificate files failed - $err\n"
+    }
+
+    unlink $cert_path_old;
+
+    return $info;
+}
+
+sub lock_acme {
+    my ($account_name, $timeout, $code, @param) = @_;
+
+    my $file = "$local_acme_lock.$account_name";
+
+    my $res = PVE::Tools::lock_file($file, $timeout, $code, @param);
+    die $@ if $@;
+    return $res;
+}
+
+sub acme_account_dir {
+    return $account_prefix;
+}
+
+sub list_acme_accounts {
+    my $accounts = [];
+
+    return $accounts if ! -d $account_prefix;
+
+    PVE::Tools::dir_glob_foreach($account_prefix, qr/[^.]+.*/, sub {
+	my ($name) = @_;
+
+	push @$accounts, $name
+	    if PVE::JSONSchema::pve_verify_configid($name, 1);
+    });
+
+    return $accounts;
+}
-- 
2.20.1