Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

5 files changed, 311 insertions, 0 deletions

diff --git a/server/apparmor/aaparser.go b/server/apparmor/aaparser.go
new file mode 100644
index 000000000..7f0f02ac5
--- /dev/null
+++ b/server/apparmor/aaparser.go
@@ -0,0 +1,89 @@
+// +build apparmor
+
+package apparmor
+
+import (
+	"fmt"
+	"os/exec"
+	"strconv"
+	"strings"
+)
+
+const (
+	binary = "apparmor_parser"
+)
+
+// GetVersion returns the major and minor version of apparmor_parser.
+func GetVersion() (int, error) {
+	output, err := cmd("", "--version")
+	if err != nil {
+		return -1, err
+	}
+
+	return parseVersion(output)
+}
+
+// LoadProfile runs `apparmor_parser -r` on a specified apparmor profile to
+// replace the profile.
+func LoadProfile(profilePath string) error {
+	_, err := cmd("", "-r", profilePath)
+	return err
+}
+
+// cmd runs `apparmor_parser` with the passed arguments.
+func cmd(dir string, arg ...string) (string, error) {
+	c := exec.Command(binary, arg...)
+	c.Dir = dir
+
+	output, err := c.CombinedOutput()
+	if err != nil {
+		return "", fmt.Errorf("running `%s %s` failed with output: %s\nerror: %v", c.Path, strings.Join(c.Args, " "), output, err)
+	}
+
+	return string(output), nil
+}
+
+// parseVersion takes the output from `apparmor_parser --version` and returns
+// a representation of the {major, minor, patch} version as a single number of
+// the form MMmmPPP {major, minor, patch}.
+func parseVersion(output string) (int, error) {
+	// output is in the form of the following:
+	// AppArmor parser version 2.9.1
+	// Copyright (C) 1999-2008 Novell Inc.
+	// Copyright 2009-2012 Canonical Ltd.
+
+	lines := strings.SplitN(output, "\n", 2)
+	words := strings.Split(lines[0], " ")
+	version := words[len(words)-1]
+
+	// split by major minor version
+	v := strings.Split(version, ".")
+	if len(v) == 0 || len(v) > 3 {
+		return -1, fmt.Errorf("parsing version failed for output: `%s`", output)
+	}
+
+	// Default the versions to 0.
+	var majorVersion, minorVersion, patchLevel int
+
+	majorVersion, err := strconv.Atoi(v[0])
+	if err != nil {
+		return -1, err
+	}
+
+	if len(v) > 1 {
+		minorVersion, err = strconv.Atoi(v[1])
+		if err != nil {
+			return -1, err
+		}
+	}
+	if len(v) > 2 {
+		patchLevel, err = strconv.Atoi(v[2])
+		if err != nil {
+			return -1, err
+		}
+	}
+
+	// major*10^5 + minor*10^3 + patch*10^0
+	numericVersion := majorVersion*1e5 + minorVersion*1e3 + patchLevel
+	return numericVersion, nil
+}
diff --git a/server/apparmor/apparmor_common.go b/server/apparmor/apparmor_common.go
new file mode 100644
index 000000000..6366a66e6
--- /dev/null
+++ b/server/apparmor/apparmor_common.go
@@ -0,0 +1,14 @@
+package apparmor
+
+const (
+	// DefaultApparmorProfile is the name of default apparmor profile name.
+	DefaultApparmorProfile = "crio-default"
+
+	// ContainerAnnotationKeyPrefix is the prefix to an annotation key specifying a container profile.
+	ContainerAnnotationKeyPrefix = "container.apparmor.security.beta.kubernetes.io/"
+
+	// ProfileRuntimeDefault is he profile specifying the runtime default.
+	ProfileRuntimeDefault = "runtime/default"
+	// ProfileNamePrefix is the prefix for specifying profiles loaded on the node.
+	ProfileNamePrefix = "localhost/"
+)
diff --git a/server/apparmor/apparmor_supported.go b/server/apparmor/apparmor_supported.go
new file mode 100644
index 000000000..d765c9de9
--- /dev/null
+++ b/server/apparmor/apparmor_supported.go
@@ -0,0 +1,145 @@
+// +build apparmor
+
+package apparmor
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"os"
+	"path"
+	"strings"
+
+	"github.com/docker/docker/utils/templates"
+	"github.com/opencontainers/runc/libcontainer/apparmor"
+)
+
+const (
+	// profileDirectory is the file store for apparmor profiles and macros.
+	profileDirectory = "/etc/apparmor.d"
+)
+
+// profileData holds information about the given profile for generation.
+type profileData struct {
+	// Name is profile name.
+	Name string
+	// Imports defines the apparmor functions to import, before defining the profile.
+	Imports []string
+	// InnerImports defines the apparmor functions to import in the profile.
+	InnerImports []string
+	// Version is the {major, minor, patch} version of apparmor_parser as a single number.
+	Version int
+}
+
+// EnsureDefaultApparmorProfile loads default apparmor profile, if it is not loaded.
+func EnsureDefaultApparmorProfile() error {
+	if apparmor.IsEnabled() {
+		loaded, err := IsLoaded(DefaultApparmorProfile)
+		if err != nil {
+			return fmt.Errorf("Could not check if %s AppArmor profile was loaded: %s", DefaultApparmorProfile, err)
+		}
+
+		// Nothing to do.
+		if loaded {
+			return nil
+		}
+
+		// Load the profile.
+		if err := InstallDefault(DefaultApparmorProfile); err != nil {
+			return fmt.Errorf("AppArmor enabled on system but the %s profile could not be loaded.", DefaultApparmorProfile)
+		}
+	}
+
+	return nil
+}
+
+// IsEnabled returns true if apparmor is enabled for the host.
+func IsEnabled() bool {
+	return apparmor.IsEnabled()
+}
+
+// GetProfileNameFromPodAnnotations gets the name of the profile to use with container from
+// pod annotations
+func GetProfileNameFromPodAnnotations(annotations map[string]string, containerName string) string {
+	return annotations[ContainerAnnotationKeyPrefix+containerName]
+}
+
+// InstallDefault generates a default profile in a temp directory determined by
+// os.TempDir(), then loads the profile into the kernel using 'apparmor_parser'.
+func InstallDefault(name string) error {
+	p := profileData{
+		Name: name,
+	}
+
+	// Install to a temporary directory.
+	f, err := ioutil.TempFile("", name)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+
+	if err := p.generateDefault(f); err != nil {
+		return err
+	}
+
+	return LoadProfile(f.Name())
+}
+
+// IsLoaded checks if a profile with the given name has been loaded into the
+// kernel.
+func IsLoaded(name string) (bool, error) {
+	file, err := os.Open("/sys/kernel/security/apparmor/profiles")
+	if err != nil {
+		return false, err
+	}
+	defer file.Close()
+
+	r := bufio.NewReader(file)
+	for {
+		p, err := r.ReadString('\n')
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return false, err
+		}
+		if strings.HasPrefix(p, name+" ") {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
+
+// generateDefault creates an apparmor profile from ProfileData.
+func (p *profileData) generateDefault(out io.Writer) error {
+	compiled, err := templates.NewParse("apparmor_profile", baseTemplate)
+	if err != nil {
+		return err
+	}
+
+	if macroExists("tunables/global") {
+		p.Imports = append(p.Imports, "#include <tunables/global>")
+	} else {
+		p.Imports = append(p.Imports, "@{PROC}=/proc/")
+	}
+
+	if macroExists("abstractions/base") {
+		p.InnerImports = append(p.InnerImports, "#include <abstractions/base>")
+	}
+
+	ver, err := GetVersion()
+	if err != nil {
+		return err
+	}
+	p.Version = ver
+
+	return compiled.Execute(out, p)
+}
+
+// macrosExists checks if the passed macro exists.
+func macroExists(m string) bool {
+	_, err := os.Stat(path.Join(profileDirectory, m))
+	return err == nil
+}
diff --git a/server/apparmor/apparmor_unsupported.go b/server/apparmor/apparmor_unsupported.go
new file mode 100644
index 000000000..fbd1d87a0
--- /dev/null
+++ b/server/apparmor/apparmor_unsupported.go
@@ -0,0 +1,18 @@
+// +build !apparmor
+
+package apparmor
+
+// IsEnabled returns false, when build without apparmor build tag.
+func IsEnabled() bool {
+	return false
+}
+
+// EnsureDefaultApparmorProfile dose nothing, when build without apparmor build tag.
+func EnsureDefaultApparmorProfile() error {
+	return nil
+}
+
+// GetProfileNameFromPodAnnotations dose nothing, when build without apparmor build tag.
+func GetProfileNameFromPodAnnotations(annotations map[string]string, containerName string) string {
+	return ""
+}
diff --git a/server/apparmor/template.go b/server/apparmor/template.go
new file mode 100644
index 000000000..6656ff61c
--- /dev/null
+++ b/server/apparmor/template.go
@@ -0,0 +1,45 @@
+// +build apparmor
+
+package apparmor
+
+// baseTemplate defines the default apparmor profile for containers.
+const baseTemplate = `
+{{range $value := .Imports}}
+{{$value}}
+{{end}}
+
+profile {{.Name}} flags=(attach_disconnected,mediate_deleted) {
+{{range $value := .InnerImports}}
+  {{$value}}
+{{end}}
+
+  network,
+  capability,
+  file,
+  umount,
+
+  deny @{PROC}/* w,   # deny write for all files directly in /proc (not in a subdir)
+  # deny write to files not in /proc/<number>/** or /proc/sys/**
+  deny @{PROC}/{[^1-9],[^1-9][^0-9],[^1-9s][^0-9y][^0-9s],[^1-9][^0-9][^0-9][^0-9]*}/** w,
+  deny @{PROC}/sys/[^k]** w,  # deny /proc/sys except /proc/sys/k* (effectively /proc/sys/kernel)
+  deny @{PROC}/sys/kernel/{?,??,[^s][^h][^m]**} w,  # deny everything except shm* in /proc/sys/kernel/
+  deny @{PROC}/sysrq-trigger rwklx,
+  deny @{PROC}/mem rwklx,
+  deny @{PROC}/kmem rwklx,
+  deny @{PROC}/kcore rwklx,
+
+  deny mount,
+
+  deny /sys/[^f]*/** wklx,
+  deny /sys/f[^s]*/** wklx,
+  deny /sys/fs/[^c]*/** wklx,
+  deny /sys/fs/c[^g]*/** wklx,
+  deny /sys/fs/cg[^r]*/** wklx,
+  deny /sys/firmware/** rwklx,
+  deny /sys/kernel/security/** rwklx,
+
+{{if ge .Version 208095}}
+  ptrace (trace,read) peer={{.Name}},
+{{end}}
+}
+`