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-rw-r--r--libpod/container_api.go8
-rw-r--r--libpod/container_internal.go56
-rw-r--r--libpod/container_internal_linux.go44
-rw-r--r--pkg/lookup/lookup.go156
4 files changed, 201 insertions, 63 deletions
diff --git a/libpod/container_api.go b/libpod/container_api.go
index 41a131ea2..83f93cf9e 100644
--- a/libpod/container_api.go
+++ b/libpod/container_api.go
@@ -10,8 +10,8 @@ import (
"time"
"github.com/containers/libpod/libpod/driver"
- "github.com/containers/libpod/pkg/chrootuser"
"github.com/containers/libpod/pkg/inspect"
+ "github.com/containers/libpod/pkg/lookup"
"github.com/containers/storage/pkg/stringid"
"github.com/docker/docker/daemon/caps"
"github.com/pkg/errors"
@@ -292,13 +292,13 @@ func (c *Container) Exec(tty, privileged bool, env, cmd []string, user string) e
// the host
hostUser := ""
if user != "" {
- uid, gid, err := chrootuser.GetUser(c.state.Mountpoint, user)
+ execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, user, nil)
if err != nil {
- return errors.Wrapf(err, "error getting user to launch exec session as")
+ return err
}
// runc expects user formatted as uid:gid
- hostUser = fmt.Sprintf("%d:%d", uid, gid)
+ hostUser = fmt.Sprintf("%d:%d", execUser.Uid, execUser.Gid)
}
// Generate exec session ID
diff --git a/libpod/container_internal.go b/libpod/container_internal.go
index 2af216358..d928c4aed 100644
--- a/libpod/container_internal.go
+++ b/libpod/container_internal.go
@@ -5,6 +5,7 @@ import (
"context"
"encoding/json"
"fmt"
+ "github.com/opencontainers/runc/libcontainer/user"
"io"
"io/ioutil"
"os"
@@ -14,9 +15,9 @@ import (
"syscall"
"github.com/containers/buildah/imagebuildah"
- "github.com/containers/libpod/pkg/chrootuser"
"github.com/containers/libpod/pkg/hooks"
"github.com/containers/libpod/pkg/hooks/exec"
+ "github.com/containers/libpod/pkg/lookup"
"github.com/containers/libpod/pkg/resolvconf"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/libpod/pkg/secrets"
@@ -1029,7 +1030,8 @@ func (c *Container) writeStringToRundir(destFile, output string) (string, error)
func (c *Container) generatePasswd() (string, error) {
var (
groupspec string
- gid uint32
+ group *user.Group
+ gid int
)
if c.config.User == "" {
return "", nil
@@ -1044,21 +1046,27 @@ func (c *Container) generatePasswd() (string, error) {
if err != nil {
return "", nil
}
- // if UID exists inside of container rootfs /etc/passwd then
- // don't generate passwd
- if _, _, err := chrootuser.LookupUIDInContainer(c.state.Mountpoint, uid); err == nil {
+ // Lookup the user to see if it exists in the container image
+ _, err = lookup.GetUser(c.state.Mountpoint, userspec)
+ if err != nil && err != user.ErrNoPasswdEntries {
+ return "", err
+ }
+ if err == nil {
return "", nil
}
- if err == nil && groupspec != "" {
+ if groupspec != "" {
if !c.state.Mounted {
return "", errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate group field for passwd record", c.ID())
}
- gid, err = chrootuser.GetGroup(c.state.Mountpoint, groupspec)
+ group, err = lookup.GetGroup(c.state.Mountpoint, groupspec)
if err != nil {
- return "", errors.Wrapf(err, "unable to get gid from %s formporary passwd file")
+ if err == user.ErrNoGroupEntries {
+ return "", errors.Wrapf(err, "unable to get gid %s from group file", groupspec)
+ }
+ return "", err
}
+ gid = group.Gid
}
-
originPasswdFile := filepath.Join(c.state.Mountpoint, "/etc/passwd")
orig, err := ioutil.ReadFile(originPasswdFile)
if err != nil {
@@ -1153,6 +1161,7 @@ func (c *Container) generateHosts() (string, error) {
}
func (c *Container) addLocalVolumes(ctx context.Context, g *generate.Generator) error {
+ var uid, gid int
mountPoint := c.state.Mountpoint
if !c.state.Mounted {
return errors.Wrapf(ErrInternal, "container is not mounted")
@@ -1176,6 +1185,18 @@ func (c *Container) addLocalVolumes(ctx context.Context, g *generate.Generator)
}
}
+ if c.config.User != "" {
+ if !c.state.Mounted {
+ return errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate User field", c.ID())
+ }
+ execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, c.config.User, nil)
+ if err != nil {
+ return err
+ }
+ uid = execUser.Uid
+ gid = execUser.Gid
+ }
+
for k := range imageData.ContainerConfig.Volumes {
mount := spec.Mount{
Destination: k,
@@ -1186,19 +1207,6 @@ func (c *Container) addLocalVolumes(ctx context.Context, g *generate.Generator)
continue
}
volumePath := filepath.Join(c.config.StaticDir, "volumes", k)
- var (
- uid uint32
- gid uint32
- )
- if c.config.User != "" {
- if !c.state.Mounted {
- return errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate User field", c.ID())
- }
- uid, gid, err = chrootuser.GetUser(c.state.Mountpoint, c.config.User)
- if err != nil {
- return err
- }
- }
// Ensure the symlinks are resolved
resolvedSymlink, err := imagebuildah.ResolveSymLink(mountPoint, k)
@@ -1218,7 +1226,7 @@ func (c *Container) addLocalVolumes(ctx context.Context, g *generate.Generator)
return errors.Wrapf(err, "error creating directory %q for volume %q in container %q", volumePath, k, c.ID())
}
- if err = os.Chown(srcPath, int(uid), int(gid)); err != nil {
+ if err = os.Chown(srcPath, uid, gid); err != nil {
return errors.Wrapf(err, "error chowning directory %q for volume %q in container %q", srcPath, k, c.ID())
}
}
@@ -1228,7 +1236,7 @@ func (c *Container) addLocalVolumes(ctx context.Context, g *generate.Generator)
return errors.Wrapf(err, "error creating directory %q for volume %q in container %q", volumePath, k, c.ID())
}
- if err = os.Chown(volumePath, int(uid), int(gid)); err != nil {
+ if err = os.Chown(volumePath, uid, gid); err != nil {
return errors.Wrapf(err, "error chowning directory %q for volume %q in container %q", volumePath, k, c.ID())
}
diff --git a/libpod/container_internal_linux.go b/libpod/container_internal_linux.go
index 0a1784ba7..7bf2c71ca 100644
--- a/libpod/container_internal_linux.go
+++ b/libpod/container_internal_linux.go
@@ -19,12 +19,10 @@ import (
cnitypes "github.com/containernetworking/cni/pkg/types/current"
"github.com/containernetworking/plugins/pkg/ns"
crioAnnotations "github.com/containers/libpod/pkg/annotations"
- "github.com/containers/libpod/pkg/chrootuser"
"github.com/containers/libpod/pkg/criu"
+ "github.com/containers/libpod/pkg/lookup"
"github.com/containers/libpod/pkg/rootless"
"github.com/containers/storage/pkg/idtools"
- "github.com/cyphar/filepath-securejoin"
- "github.com/opencontainers/runc/libcontainer/user"
spec "github.com/opencontainers/runtime-spec/specs-go"
"github.com/opencontainers/runtime-tools/generate"
"github.com/opencontainers/selinux/go-selinux/label"
@@ -135,6 +133,10 @@ func (c *Container) cleanupNetwork() error {
// Generate spec for a container
// Accepts a map of the container's dependencies
func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
+ execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, c.config.User, nil)
+ if err != nil {
+ return nil, err
+ }
g := generate.NewFromSpec(c.config.Spec)
// If network namespace was requested, add it now
@@ -188,7 +190,6 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
}
}
- var err error
if !rootless.IsRootless() {
if c.state.ExtensionStageHooks, err = c.setupOCIHooks(ctx, g.Config); err != nil {
return nil, errors.Wrapf(err, "error setting up OCI Hooks")
@@ -206,13 +207,9 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
if !c.state.Mounted {
return nil, errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate User field", c.ID())
}
- uid, gid, err := chrootuser.GetUser(c.state.Mountpoint, c.config.User)
- if err != nil {
- return nil, err
- }
// User and Group must go together
- g.SetProcessUID(uid)
- g.SetProcessGID(gid)
+ g.SetProcessUID(uint32(execUser.Uid))
+ g.SetProcessGID(uint32(execUser.Gid))
}
// Add addition groups if c.config.GroupAdd is not empty
@@ -220,11 +217,8 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
if !c.state.Mounted {
return nil, errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to add additional groups", c.ID())
}
- for _, group := range c.config.Groups {
- gid, err := chrootuser.GetGroup(c.state.Mountpoint, group)
- if err != nil {
- return nil, err
- }
+ gids, _ := lookup.GetContainerGroups(c.config.Groups, c.state.Mountpoint, nil)
+ for _, gid := range gids {
g.AddProcessAdditionalGid(gid)
}
}
@@ -237,26 +231,6 @@ func (c *Container) generateSpec(ctx context.Context) (*spec.Spec, error) {
// Look up and add groups the user belongs to, if a group wasn't directly specified
if !rootless.IsRootless() && !strings.Contains(c.config.User, ":") {
- var groupDest, passwdDest string
- defaultExecUser := user.ExecUser{
- Uid: 0,
- Gid: 0,
- Home: "/",
- }
-
- // Make sure the /etc/group and /etc/passwd destinations are not a symlink to something naughty
- if groupDest, err = securejoin.SecureJoin(c.state.Mountpoint, "/etc/group"); err != nil {
- logrus.Debug(err)
- return nil, err
- }
- if passwdDest, err = securejoin.SecureJoin(c.state.Mountpoint, "/etc/passwd"); err != nil {
- logrus.Debug(err)
- return nil, err
- }
- execUser, err := user.GetExecUserPath(c.config.User, &defaultExecUser, passwdDest, groupDest)
- if err != nil {
- return nil, err
- }
for _, gid := range execUser.Sgids {
g.AddProcessAdditionalGid(uint32(gid))
}
diff --git a/pkg/lookup/lookup.go b/pkg/lookup/lookup.go
new file mode 100644
index 000000000..b27e2a724
--- /dev/null
+++ b/pkg/lookup/lookup.go
@@ -0,0 +1,156 @@
+package lookup
+
+import (
+ "github.com/cyphar/filepath-securejoin"
+ "github.com/opencontainers/runc/libcontainer/user"
+ "github.com/sirupsen/logrus"
+ "strconv"
+)
+
+const (
+ etcpasswd = "/etc/passwd"
+ etcgroup = "/etc/group"
+)
+
+// Overrides allows you to override defaults in GetUserGroupInfo
+type Overrides struct {
+ DefaultUser *user.ExecUser
+ ContainerEtcPasswdPath string
+ ContainerEtcGroupPath string
+}
+
+// GetUserGroupInfo takes string forms of the the container's mount path and the container user and
+// returns a ExecUser with uid, gid, sgids, and home. And override can be provided for defaults.
+func GetUserGroupInfo(containerMount, containerUser string, override *Overrides) (*user.ExecUser, error) {
+ var (
+ passwdDest, groupDest string
+ defaultExecUser *user.ExecUser
+ err error
+ )
+ passwdPath := etcpasswd
+ groupPath := etcgroup
+
+ if override != nil {
+ // Check for an override /etc/passwd path
+ if override.ContainerEtcPasswdPath != "" {
+ passwdPath = override.ContainerEtcPasswdPath
+ }
+ // Check for an override for /etc/group path
+ if override.ContainerEtcGroupPath != "" {
+ groupPath = override.ContainerEtcGroupPath
+ }
+ }
+
+ // Check for an override default user
+ if override != nil && override.DefaultUser != nil {
+ defaultExecUser = override.DefaultUser
+ } else {
+ // Define a default container user
+ //defaultExecUser = &user.ExecUser{
+ // Uid: 0,
+ // Gid: 0,
+ // Home: "/",
+ defaultExecUser = nil
+
+ }
+
+ // Make sure the /etc/group and /etc/passwd destinations are not a symlink to something naughty
+ if passwdDest, err = securejoin.SecureJoin(containerMount, passwdPath); err != nil {
+ logrus.Debug(err)
+ return nil, err
+ }
+ if groupDest, err = securejoin.SecureJoin(containerMount, groupPath); err != nil {
+ logrus.Debug(err)
+ return nil, err
+ }
+ return user.GetExecUserPath(containerUser, defaultExecUser, passwdDest, groupDest)
+}
+
+// GetContainerGroups uses securejoin to get a list of numerical groupids from a container. Per the runc
+// function it calls: If a group name cannot be found, an error will be returned. If a group id cannot be found,
+// or the given group data is nil, the id will be returned as-is provided it is in the legal range.
+func GetContainerGroups(groups []string, containerMount string, override *Overrides) ([]uint32, error) {
+ var (
+ groupDest string
+ err error
+ uintgids []uint32
+ )
+
+ groupPath := etcgroup
+ if override != nil && override.ContainerEtcGroupPath != "" {
+ groupPath = override.ContainerEtcGroupPath
+ }
+
+ if groupDest, err = securejoin.SecureJoin(containerMount, groupPath); err != nil {
+ logrus.Debug(err)
+ return nil, err
+ }
+
+ gids, err := user.GetAdditionalGroupsPath(groups, groupDest)
+ if err != nil {
+ return nil, err
+ }
+ // For libpod, we want []uint32s
+ for _, gid := range gids {
+ uintgids = append(uintgids, uint32(gid))
+ }
+ return uintgids, nil
+}
+
+// GetUser takes a containermount path and user name or id and returns
+// a matching User structure from /etc/passwd. If it cannot locate a user
+// with the provided information, an ErrNoPasswdEntries is returned.
+func GetUser(containerMount, userIDorName string) (*user.User, error) {
+ var inputIsName bool
+ uid, err := strconv.Atoi(userIDorName)
+ if err != nil {
+ inputIsName = true
+ }
+ passwdDest, err := securejoin.SecureJoin(containerMount, etcpasswd)
+ if err != nil {
+ return nil, err
+ }
+ users, err := user.ParsePasswdFileFilter(passwdDest, func(u user.User) bool {
+ if inputIsName {
+ return u.Name == userIDorName
+ }
+ return u.Uid == uid
+ })
+ if err != nil {
+ return nil, err
+ }
+ if len(users) > 0 {
+ return &users[0], nil
+ }
+ return nil, user.ErrNoPasswdEntries
+}
+
+// GetGroup takes ac ontainermount path and a group name or id and returns
+// a match Group struct from /etc/group. if it cannot locate a group,
+// an ErrNoGroupEntries error is returned.
+func GetGroup(containerMount, groupIDorName string) (*user.Group, error) {
+ var inputIsName bool
+ gid, err := strconv.Atoi(groupIDorName)
+ if err != nil {
+ inputIsName = true
+ }
+
+ groupDest, err := securejoin.SecureJoin(containerMount, etcgroup)
+ if err != nil {
+ return nil, err
+ }
+
+ groups, err := user.ParseGroupFileFilter(groupDest, func(g user.Group) bool {
+ if inputIsName {
+ return g.Name == groupIDorName
+ }
+ return g.Gid == gid
+ })
+ if err != nil {
+ return nil, err
+ }
+ if len(groups) > 0 {
+ return &groups[0], nil
+ }
+ return nil, user.ErrNoGroupEntries
+}
generated by cgit v1.2.3-54-g00ecf (git 2.39.0) at 2024-09-27 09:23:45 +0000