apparmor: apply default profile at container initialization

Apply the default AppArmor profile at container initialization to cover
all possible code paths (i.e., podman-{start,run}) before executing the
runtime.  This allows moving most of the logic into pkg/apparmor.

Also make the loading and application of the default AppArmor profile
versio-indepenent by checking for the `libpod-default-` prefix and
over-writing the profile in the run-time spec if needed.

The intitial run-time spec of the container differs a bit from the
applied one when having started the container, which results in
displaying a potentially outdated AppArmor profile when inspecting
a container.  To fix that, load the container config from the file
system if present and use it to display the data.

Fixes: #2107
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

5 files changed, 84 insertions, 260 deletions

diff --git a/pkg/apparmor/apparmor.go b/pkg/apparmor/apparmor.go
index 8b9f99477..45c029c07 100644
--- a/pkg/apparmor/apparmor.go
+++ b/pkg/apparmor/apparmor.go
@@ -2,11 +2,16 @@ package apparmor
 
 import (
 	"errors"
+	libpodVersion "github.com/containers/libpod/version"
 )
 
 var (
+	// DefaultLipodProfilePrefix is used for version-independent presence checks.
+	DefaultLipodProfilePrefix = "libpod-default" + "-"
 	// DefaultLibpodProfile is the name of default libpod AppArmor profile.
-	DefaultLibpodProfile = "libpod-default"
+	DefaultLibpodProfile = DefaultLipodProfilePrefix + libpodVersion.Version
 	// ErrApparmorUnsupported indicates that AppArmor support is not supported.
 	ErrApparmorUnsupported = errors.New("AppArmor is not supported")
+	// ErrApparmorRootless indicates that AppArmor support is not supported in rootless mode.
+	ErrApparmorRootless = errors.New("AppArmor is not supported in rootless mode")
 )
diff --git a/pkg/apparmor/apparmor_linux.go b/pkg/apparmor/apparmor_linux.go
index b0e3ca0fd..0787b3fa5 100644
--- a/pkg/apparmor/apparmor_linux.go
+++ b/pkg/apparmor/apparmor_linux.go
@@ -13,7 +13,10 @@ import (
 	"strings"
 	"text/template"
 
+	"github.com/containers/libpod/pkg/rootless"
 	runcaa "github.com/opencontainers/runc/libcontainer/apparmor"
+	"github.com/pkg/errors"
+	"github.com/sirupsen/logrus"
 )
 
 // profileDirectory is the file store for apparmor profiles and macros.
@@ -21,6 +24,9 @@ var profileDirectory = "/etc/apparmor.d"
 
 // IsEnabled returns true if AppArmor is enabled on the host.
 func IsEnabled() bool {
+	if rootless.IsRootless() {
+		return false
+	}
 	return runcaa.IsEnabled()
 }
 
@@ -71,6 +77,10 @@ func macroExists(m string) bool {
 // InstallDefault generates a default profile and loads it into the kernel
 // using 'apparmor_parser'.
 func InstallDefault(name string) error {
+	if rootless.IsRootless() {
+		return ErrApparmorRootless
+	}
+
 	p := profileData{
 		Name: name,
 	}
@@ -97,6 +107,10 @@ func InstallDefault(name string) error {
 // IsLoaded checks if a profile with the given name has been loaded into the
 // kernel.
 func IsLoaded(name string) (bool, error) {
+	if name != "" && rootless.IsRootless() {
+		return false, errors.Wrapf(ErrApparmorRootless, "cannot load AppArmor profile %q", name)
+	}
+
 	file, err := os.Open("/sys/kernel/security/apparmor/profiles")
 	if err != nil {
 		if os.IsNotExist(err) {
@@ -188,3 +202,55 @@ func parseAAParserVersion(output string) (int, error) {
 	return numericVersion, nil
 
 }
+
+// CheckProfileAndLoadDefault checks if the specified profile is loaded and
+// loads the DefaultLibpodProfile if the specified on is prefixed by
+// DefaultLipodProfilePrefix.  This allows to always load and apply the latest
+// default AppArmor profile.  Note that AppArmor requires root.  If it's a
+// default profile, return DefaultLipodProfilePrefix, otherwise the specified
+// one.
+func CheckProfileAndLoadDefault(name string) (string, error) {
+	if name == "unconfined" {
+		return name, nil
+	}
+
+	if name != "" && rootless.IsRootless() {
+		return "", errors.Wrapf(ErrApparmorRootless, "cannot load AppArmor profile %q", name)
+	}
+
+	if name != "" && !runcaa.IsEnabled() {
+		return "", fmt.Errorf("profile %q specified but AppArmor is disabled on the host", name)
+	}
+
+	// If the specified name is not empty or is not a default libpod one,
+	// ignore it and return the name.
+	if name != "" && !strings.HasPrefix(name, DefaultLipodProfilePrefix) {
+		isLoaded, err := IsLoaded(name)
+		if err != nil {
+			return "", err
+		}
+		if !isLoaded {
+			return "", fmt.Errorf("AppArmor profile %q specified but not loaded")
+		}
+		return name, nil
+	}
+
+	name = DefaultLibpodProfile
+	// To avoid expensive redundant loads on each invocation, check
+	// if it's loaded before installing it.
+	isLoaded, err := IsLoaded(name)
+	if err != nil {
+		return "", err
+	}
+	if !isLoaded {
+		err = InstallDefault(name)
+		if err != nil {
+			return "", err
+		}
+		logrus.Infof("successfully loaded AppAmor profile %q", name)
+	} else {
+		logrus.Infof("AppAmor profile %q is already loaded", name)
+	}
+
+	return name, nil
+}
diff --git a/pkg/apparmor/apparmor_unsupported.go b/pkg/apparmor/apparmor_unsupported.go
index df1336b07..b2b4de5f5 100644
--- a/pkg/apparmor/apparmor_unsupported.go
+++ b/pkg/apparmor/apparmor_unsupported.go
@@ -2,19 +2,25 @@
 
 package apparmor
 
-// IsEnabled returns true if AppArmor is enabled on the host.
+// IsEnabled dummy.
 func IsEnabled() bool {
 	return false
 }
 
-// InstallDefault generates a default profile in a temp directory determined by
-// os.TempDir(), then loads the profile into the kernel using 'apparmor_parser'.
+// InstallDefault dummy.
 func InstallDefault(name string) error {
 	return ErrApparmorUnsupported
 }
 
-// IsLoaded checks if a profile with the given name has been loaded into the
-// kernel.
+// IsLoaded dummy.
 func IsLoaded(name string) (bool, error) {
 	return false, ErrApparmorUnsupported
 }
+
+// CheckProfileAndLoadDefault dummy.
+func CheckProfileAndLoadDefault(name string) (string, error) {
+	if name == "" {
+		return "", nil
+	}
+	return "", ErrApparmorUnsupported
+}
diff --git a/pkg/spec/spec.go b/pkg/spec/spec.go
index ffa999730..9ef0223f2 100644
--- a/pkg/spec/spec.go
+++ b/pkg/spec/spec.go
@@ -252,6 +252,7 @@ func CreateConfigToOCISpec(config *CreateConfig) (*spec.Spec, error) { //nolint
 	}
 	// SECURITY OPTS
 	g.SetProcessNoNewPrivileges(config.NoNewPrivs)
+
 	g.SetProcessApparmorProfile(config.ApparmorProfile)
 
 	blockAccessToKernelFilesystems(config, &g)
diff --git a/pkg/sysinfo/sysinfo_linux.go~ b/pkg/sysinfo/sysinfo_linux.go~
deleted file mode 100644
index 471f786a7..000000000
--- a/pkg/sysinfo/sysinfo_linux.go~
+++ /dev/null
@@ -1,254 +0,0 @@
-package sysinfo
-
-import (
-	"fmt"
-	"io/ioutil"
-	"os"
-	"path"
-	"strings"
-
-	"github.com/opencontainers/runc/libcontainer/cgroups"
-	"github.com/sirupsen/logrus"
-	"golang.org/x/sys/unix"
-)
-
-func findCgroupMountpoints() (map[string]string, error) {
-	cgMounts, err := cgroups.GetCgroupMounts(false)
-	if err != nil {
-		return nil, fmt.Errorf("Failed to parse cgroup information: %v", err)
-	}
-	mps := make(map[string]string)
-	for _, m := range cgMounts {
-		for _, ss := range m.Subsystems {
-			mps[ss] = m.Mountpoint
-		}
-	}
-	return mps, nil
-}
-
-// New returns a new SysInfo, using the filesystem to detect which features
-// the kernel supports. If `quiet` is `false` warnings are printed in logs
-// whenever an error occurs or misconfigurations are present.
-func New(quiet bool) *SysInfo {
-	sysInfo := &SysInfo{}
-	cgMounts, err := findCgroupMountpoints()
-	if err != nil {
-		logrus.Warnf("Failed to parse cgroup information: %v", err)
-	} else {
-		sysInfo.cgroupMemInfo = checkCgroupMem(cgMounts, quiet)
-		sysInfo.cgroupCPUInfo = checkCgroupCPU(cgMounts, quiet)
-		sysInfo.cgroupBlkioInfo = checkCgroupBlkioInfo(cgMounts, quiet)
-		sysInfo.cgroupCpusetInfo = checkCgroupCpusetInfo(cgMounts, quiet)
-		sysInfo.cgroupPids = checkCgroupPids(quiet)
-	}
-
-	_, ok := cgMounts["devices"]
-	sysInfo.CgroupDevicesEnabled = ok
-
-	sysInfo.IPv4ForwardingDisabled = !readProcBool("/proc/sys/net/ipv4/ip_forward")
-	sysInfo.BridgeNFCallIPTablesDisabled = !readProcBool("/proc/sys/net/bridge/bridge-nf-call-iptables")
-	sysInfo.BridgeNFCallIP6TablesDisabled = !readProcBool("/proc/sys/net/bridge/bridge-nf-call-ip6tables")
-
-	// Check if AppArmor is supported.
-	if _, err := os.Stat("/sys/kernel/security/apparmor"); !os.IsNotExist(err) {
-		sysInfo.AppArmor = true
-	}
-
-	// Check if Seccomp is supported, via CONFIG_SECCOMP.
-	if err := unix.Prctl(unix.PR_GET_SECCOMP, 0, 0, 0, 0); err != unix.EINVAL {
-		// Make sure the kernel has CONFIG_SECCOMP_FILTER.
-		if err := unix.Prctl(unix.PR_SET_SECCOMP, unix.SECCOMP_MODE_FILTER, 0, 0, 0); err != unix.EINVAL {
-			sysInfo.Seccomp = true
-		}
-	}
-
-	return sysInfo
-}
-
-// checkCgroupMem reads the memory information from the memory cgroup mount point.
-func checkCgroupMem(cgMounts map[string]string, quiet bool) cgroupMemInfo {
-	mountPoint, ok := cgMounts["memory"]
-	if !ok {
-		if !quiet {
-			logrus.Warn("Your kernel does not support cgroup memory limit")
-		}
-		return cgroupMemInfo{}
-	}
-
-	swapLimit := cgroupEnabled(mountPoint, "memory.memsw.limit_in_bytes")
-	if !quiet && !swapLimit {
-		logrus.Warn("Your kernel does not support swap memory limit")
-	}
-	memoryReservation := cgroupEnabled(mountPoint, "memory.soft_limit_in_bytes")
-	if !quiet && !memoryReservation {
-		logrus.Warn("Your kernel does not support memory reservation")
-	}
-	oomKillDisable := cgroupEnabled(mountPoint, "memory.oom_control")
-	if !quiet && !oomKillDisable {
-		logrus.Warn("Your kernel does not support oom control")
-	}
-	memorySwappiness := cgroupEnabled(mountPoint, "memory.swappiness")
-	if !quiet && !memorySwappiness {
-		logrus.Warn("Your kernel does not support memory swappiness")
-	}
-	kernelMemory := cgroupEnabled(mountPoint, "memory.kmem.limit_in_bytes")
-	if !quiet && !kernelMemory {
-		logrus.Warn("Your kernel does not support kernel memory limit")
-	}
-
-	return cgroupMemInfo{
-		MemoryLimit:       true,
-		SwapLimit:         swapLimit,
-		MemoryReservation: memoryReservation,
-		OomKillDisable:    oomKillDisable,
-		MemorySwappiness:  memorySwappiness,
-		KernelMemory:      kernelMemory,
-	}
-}
-
-// checkCgroupCPU reads the cpu information from the cpu cgroup mount point.
-func checkCgroupCPU(cgMounts map[string]string, quiet bool) cgroupCPUInfo {
-	mountPoint, ok := cgMounts["cpu"]
-	if !ok {
-		if !quiet {
-			logrus.Warn("Unable to find cpu cgroup in mounts")
-		}
-		return cgroupCPUInfo{}
-	}
-
-	cpuShares := cgroupEnabled(mountPoint, "cpu.shares")
-	if !quiet && !cpuShares {
-		logrus.Warn("Your kernel does not support cgroup cpu shares")
-	}
-
-	cpuCfsPeriod := cgroupEnabled(mountPoint, "cpu.cfs_period_us")
-	if !quiet && !cpuCfsPeriod {
-		logrus.Warn("Your kernel does not support cgroup cfs period")
-	}
-
-	cpuCfsQuota := cgroupEnabled(mountPoint, "cpu.cfs_quota_us")
-	if !quiet && !cpuCfsQuota {
-		logrus.Warn("Your kernel does not support cgroup cfs quotas")
-	}
-
-	cpuRealtimePeriod := cgroupEnabled(mountPoint, "cpu.rt_period_us")
-	if !quiet && !cpuRealtimePeriod {
-		logrus.Warn("Your kernel does not support cgroup rt period")
-	}
-
-	cpuRealtimeRuntime := cgroupEnabled(mountPoint, "cpu.rt_runtime_us")
-	if !quiet && !cpuRealtimeRuntime {
-		logrus.Warn("Your kernel does not support cgroup rt runtime")
-	}
-
-	return cgroupCPUInfo{
-		CPUShares:          cpuShares,
-		CPUCfsPeriod:       cpuCfsPeriod,
-		CPUCfsQuota:        cpuCfsQuota,
-		CPURealtimePeriod:  cpuRealtimePeriod,
-		CPURealtimeRuntime: cpuRealtimeRuntime,
-	}
-}
-
-// checkCgroupBlkioInfo reads the blkio information from the blkio cgroup mount point.
-func checkCgroupBlkioInfo(cgMounts map[string]string, quiet bool) cgroupBlkioInfo {
-	mountPoint, ok := cgMounts["blkio"]
-	if !ok {
-		if !quiet {
-			logrus.Warn("Unable to find blkio cgroup in mounts")
-		}
-		return cgroupBlkioInfo{}
-	}
-
-	weight := cgroupEnabled(mountPoint, "blkio.weight")
-	if !quiet && !weight {
-		logrus.Warn("Your kernel does not support cgroup blkio weight")
-	}
-
-	weightDevice := cgroupEnabled(mountPoint, "blkio.weight_device")
-	if !quiet && !weightDevice {
-		logrus.Warn("Your kernel does not support cgroup blkio weight_device")
-	}
-
-	readBpsDevice := cgroupEnabled(mountPoint, "blkio.throttle.read_bps_device")
-	if !quiet && !readBpsDevice {
-		logrus.Warn("Your kernel does not support cgroup blkio throttle.read_bps_device")
-	}
-
-	writeBpsDevice := cgroupEnabled(mountPoint, "blkio.throttle.write_bps_device")
-	if !quiet && !writeBpsDevice {
-		logrus.Warn("Your kernel does not support cgroup blkio throttle.write_bps_device")
-	}
-	readIOpsDevice := cgroupEnabled(mountPoint, "blkio.throttle.read_iops_device")
-	if !quiet && !readIOpsDevice {
-		logrus.Warn("Your kernel does not support cgroup blkio throttle.read_iops_device")
-	}
-
-	writeIOpsDevice := cgroupEnabled(mountPoint, "blkio.throttle.write_iops_device")
-	if !quiet && !writeIOpsDevice {
-		logrus.Warn("Your kernel does not support cgroup blkio throttle.write_iops_device")
-	}
-	return cgroupBlkioInfo{
-		BlkioWeight:          weight,
-		BlkioWeightDevice:    weightDevice,
-		BlkioReadBpsDevice:   readBpsDevice,
-		BlkioWriteBpsDevice:  writeBpsDevice,
-		BlkioReadIOpsDevice:  readIOpsDevice,
-		BlkioWriteIOpsDevice: writeIOpsDevice,
-	}
-}
-
-// checkCgroupCpusetInfo reads the cpuset information from the cpuset cgroup mount point.
-func checkCgroupCpusetInfo(cgMounts map[string]string, quiet bool) cgroupCpusetInfo {
-	mountPoint, ok := cgMounts["cpuset"]
-	if !ok {
-		if !quiet {
-			logrus.Warn("Unable to find cpuset cgroup in mounts")
-		}
-		return cgroupCpusetInfo{}
-	}
-
-	cpus, err := ioutil.ReadFile(path.Join(mountPoint, "cpuset.cpus"))
-	if err != nil {
-		return cgroupCpusetInfo{}
-	}
-
-	mems, err := ioutil.ReadFile(path.Join(mountPoint, "cpuset.mems"))
-	if err != nil {
-		return cgroupCpusetInfo{}
-	}
-
-	return cgroupCpusetInfo{
-		Cpuset: true,
-		Cpus:   strings.TrimSpace(string(cpus)),
-		Mems:   strings.TrimSpace(string(mems)),
-	}
-}
-
-// checkCgroupPids reads the pids information from the pids cgroup mount point.
-func checkCgroupPids(quiet bool) cgroupPids {
-	_, err := cgroups.FindCgroupMountpoint("pids")
-	if err != nil {
-		if !quiet {
-			logrus.Warn(err)
-		}
-		return cgroupPids{}
-	}
-
-	return cgroupPids{
-		PidsLimit: true,
-	}
-}
-
-func cgroupEnabled(mountPoint, name string) bool {
-	_, err := os.Stat(path.Join(mountPoint, name))
-	return err == nil
-}
-
-func readProcBool(path string) bool {
-	val, err := ioutil.ReadFile(path)
-	if err != nil {
-		return false
-	}
-	return strings.TrimSpace(string(val)) == "1"
-}