tests: add test for signal and ptrace OBJ_PID records

See: linux-audit#81

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

tests/Makefile

@@ -25,6 +25,7 @@ TESTS := \
 	login_tty \
 	lost_reset \
 	netfilter_pkt \
+	signal \
 	syscalls_file \
 	syscall_module \
 	syscall_socketcall \

tests/signal/Makefile

@@ -0,0 +1,8 @@
+TARGETS=$(patsubst %.c,%,$(wildcard *.c))
+
+LDLIBS += -lpthread
+
+all: $(TARGETS)
+clean:
+	rm -f $(TARGETS)
+

tests/signal/test

@@ -0,0 +1,148 @@
+#!/usr/bin/perl
+
+use strict;
+use File::Temp qw/ tempdir tempfile /;
+use Test;
+BEGIN { plan tests => 8 }
+
+###
+# functions
+
+sub key_gen {
+    my @chars = ( "A" .. "Z", "a" .. "z" );
+    my $key   = "testsuite-" . time . "-";
+    $key .= $chars[ rand @chars ] for 1 .. 8;
+    return $key;
+}
+
+###
+# setup
+
+my ( $sec, $min, $hour, $mday, $mon, $year, $wday, $yday, $isdst ) =
+  localtime(time);
+$year += 1900;
+$mon  += 1;
+my $startdate = "$year-$mon-$mday";
+my $starttime = "$hour:$min:$sec";
+
+# create stdout/stderr sinks
+( my $fh_out, my $stdout ) = tempfile(
+    TEMPLATE => '/tmp/audit-testsuite-out-XXXX',
+    UNLINK   => 1
+);
+( my $fh_err, my $stderr ) = tempfile(
+    TEMPLATE => '/tmp/audit-testsuite-err-XXXX',
+    UNLINK   => 1
+);
+
+# clear all rules, turn on auditing
+system("auditctl -D >/dev/null 2>&1");
+system("auditctl -e 1 >/dev/null 2>&1");
+
+# Generate a unique test key
+my $key = key_gen();
+my $result;
+
+###
+# tests
+# Test signals
+# Add rule to catch signals generated by self
+$result =
+  system(
+"auditctl -a exit,always -F arch=b$ENV{MODE} -S kill -F pid=$$ -F key=$key >/dev/null 2>&1"
+  );
+ok( $result, 0 );    # Was the rule accepted?
+
+# Test signal to process group
+my $task1_pid = fork();
+if ( not $task1_pid ) {
+    setpgrp || die;
+
+    # create 2 child processes
+    fork || sleep 10;
+    fork || sleep 10;
+    sleep 10;
+}
+sleep 1;
+
+# generate signal
+my $count = kill 'SIGTERM', -$task1_pid;
+ok( $count, 1 );         # Was the signal delivered?
+ok( $task1_pid > 0 );    # Did taskself start ok?
+
+# Delete audit rule
+system(
+"auditctl -d exit,always -F arch=b$ENV{MODE} -S kill -F pid=$$ -F key=$key >/dev/null 2>&1"
+);
+
+# Test ptrace
+# Add rule to catch ptrace
+$result =
+  system(
+"auditctl -a exit,always -F arch=b$ENV{MODE} -S ptrace -F key=$key >/dev/null 2>&1"
+  );
+ok( $result, 0 );    # Was the rule accepted?
+
+# Create task to which to attach
+seek( $fh_out, 0, 0 );
+system("sleep .1 >/dev/null 2>&1 & echo \$! >$stdout");
+my $task2_pid = <$fh_out>;
+chomp($task2_pid);
+
+# Generate a ptrace event
+$result = system("strace -p $task2_pid >/dev/null 2>&1");
+ok( $result, 0 );    # Was the ptrace command successful?
+
+# Delete audit rule
+$result =
+  system(
+"auditctl -d exit,always -F arch=b$ENV{MODE} -S ptrace -F key=$key >/dev/null 2>&1"
+  );
+
+# make sure the records had a chance to bubble through to the logs
+system("auditctl -m syncmarker-$key");
+for ( my $i = 0 ; $i < 10 ; $i++ ) {
+    if ( system("ausearch -m USER | grep -q syncmarker-$key") eq 0 ) {
+        last;
+    }
+    sleep(0.2);
+}
+
+# find the events
+seek( $fh_out, 0, 0 );
+seek( $fh_err, 0, 0 );
+$result = system(
+"LC_TIME=\"en_DK.utf8\" ausearch --start $startdate $starttime -i -k $key >$stdout 2>$stderr"
+);
+ok( $result, 0 );    # Was an event found?
+
+# test if we generate the OBJ_PID records correctly
+my $line;
+my $found_signal = 0;
+my $found_ptrace = 0;
+while ( $line = <$fh_out> ) {
+    if ( $line =~ /^type=OBJ_PID / ) {
+        if ( $line =~ / opid=([0-9]+) / ) {
+            if ( $1 == $task1_pid ) {
+                $found_signal = 1;
+            }
+            elsif ( $1 == $task2_pid ) {
+                $found_ptrace = 1;
+            }
+        }
+    }
+}
+ok( $found_signal, 1 );    # Was the first signal found?
+ok( $found_ptrace, 1 );    # Was the ptrace found?
+
+if ( defined $ENV{ATS_DEBUG} && $ENV{ATS_DEBUG} == 1 ) {
+    if ( !$found_signal || !$found_ptrace ) {
+        print "pid=$!\n";
+        print "pid=$task1_pid found_signal=$found_signal\n";
+        print "pid=$task2_pid found_ptrace=$found_ptrace\n";
+    }
+}
+
+###
+# cleanup
+system("service auditd restart 2>/dev/null");