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Add support for ExchangeOnline OAuth2 #123

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Add support for ExchangeOnline OAuth2 #123

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86 changes: 75 additions & 11 deletions dmarcts-report-parser.pl
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Original file line number Diff line number Diff line change
Expand Up @@ -57,24 +57,30 @@
use warnings;

# Use these modules
#use Data::Dumper;
use DBI;
use File::Basename ();
use File::MimeInfo;
use File::Slurper 'read_text';
use File::stat;
use Getopt::Long;
use IO::Compress::Gzip qw(gzip $GzipError);
#use Data::Dumper;
use IO::Socket::SSL;
#use IO::Socket::SSL 'debug3';
use JSON;
use LWP::UserAgent ();
use Mail::IMAPClient;
use Mail::Mbox::MessageParser;
use MIME::Base64 qw(encode_base64);
use MIME::Words qw(decode_mimewords);
use MIME::Parser;
use MIME::Parser::Filer;
use XML::Simple;
use DBI;
use PerlIO::gzip;
use Socket;
use Socket6;
use PerlIO::gzip;
use File::Basename ();
use File::MimeInfo;
use IO::Socket::SSL;
#use IO::Socket::SSL 'debug3';
use Switch;
use utf8;
use XML::Simple;



Expand Down Expand Up @@ -120,6 +126,7 @@ sub show_usage {
our ($debug, $delete_reports, $delete_failed, $reports_replace, $maxsize_xml, $compress_xml,
$dbtype, $dbname, $dbuser, $dbpass, $dbhost, $dbport, $db_tx_support,
$imapserver, $imapport, $imapuser, $imappass, $imapignoreerror, $imapssl, $imaptls, $imapmovefolder,
$imapoauth, $imapoauth_variant, $entra_tenant_id, $entra_client_id, $entra_client_secret,
$imapmovefoldererr, $imapreadfolder, $imapopt, $tlsverify, $processInfo);

# defaults
Expand Down Expand Up @@ -314,9 +321,22 @@ sub show_usage {
or die "$scriptname: IMAP Failure: $@";

# This connection is finished this way because of the tradgedy of exchange...
$imap->User($imapuser);
$imap->Password($imappass);
$imap->connect() or die "$scriptname: Could not connect: $@";
if ($imapoauth == 1) {
my $oauth_token;

switch($imapoauth_variant) {
case "O365" {
$oauth_token = getO365Token($entra_tenant_id, $entra_client_id, $entra_client_secret);
}
}

my $oauth_sign = encode_base64("user=". $imapuser ."\x01auth=Bearer ". $oauth_token ."\x01\x01", '');
$imap->authenticate('XOAUTH2', sub { return $oauth_sign }) or die "$scriptname: Auth error: ". $imap->LastError;
} else {
$imap->User($imapuser);
$imap->Password($imappass);
$imap->connect() or die "$scriptname: Could not connect: $@";
}

# Ignore Size Errors if we're using Exchange
$imap->Ignoresizeerrors($imapignoreerror);
Expand Down Expand Up @@ -1160,3 +1180,47 @@ sub db_column_info {
}
return %columns;
}

sub getO365Token {
my $entra_tenant_id = $_[0];
my $entra_client_id = $_[1];
my $entra_client_secret = $_[2];
my $filename = "/tmp/exchange365token";

if (-e $filename) {
my $mod = stat($filename)->mtime;
my $val = JSON->new->utf8->decode(read_text($filename));

# Tokens are valid for one hour, after that it needs to be refreshed
if ($mod + int($val->{expires_in}) > time()) {
return $val->{access_token};
}
}

my $ua = LWP::UserAgent->new(timeout => 10);
$ua->env_proxy;

my $response = $ua->post(
"https://login.microsoftonline.com/" . $entra_tenant_id . "/oauth2/v2.0/token",
{
"grant_type" => "client_credentials",
"client_id" => $entra_client_id,
"client_secret" => $entra_client_secret,
"scope" => "https://outlook.office365.com/.default"
}
);

my $token = "";
if($response->is_success) {
my $body = $response->decoded_content;
$token = JSON->new->utf8->decode($body)->{access_token};

if ($token ne "") {
open (my $fh, '>', $filename) or return $token;
print $fh $body;
close $fh;
}
}

return $token;
}