From e015c9e3f74153ef069bfbb013e715766e793bf9 Mon Sep 17 00:00:00 2001 From: Giuseppe Scrivano Date: Fri, 19 Aug 2022 15:15:47 +0200 Subject: podman: add uid and gid options to keep-id add two new options to the keep-id user namespace option: - uid: allow to override the UID used inside the container. - gid: allow to override the GID used inside the container. For example, the following command will map the rootless user (that has UID=0 inside the rootless user namespace) to the UID=11 inside the container user namespace: $ podman run --userns=keep-id:uid=11 --rm -ti fedora cat /proc/self/uid_map 0 1 11 11 0 1 12 12 65525 Closes: https://github.com/containers/podman/issues/15294 Signed-off-by: Giuseppe Scrivano --- pkg/specgen/generate/namespaces.go | 11 +++++++++-- pkg/specgen/namespaces.go | 15 ++++++++++++++- 2 files changed, 23 insertions(+), 3 deletions(-) (limited to 'pkg/specgen') diff --git a/pkg/specgen/generate/namespaces.go b/pkg/specgen/generate/namespaces.go index f0d4e9153..e27a3abac 100644 --- a/pkg/specgen/generate/namespaces.go +++ b/pkg/specgen/generate/namespaces.go @@ -11,6 +11,7 @@ import ( "github.com/containers/common/pkg/config" "github.com/containers/podman/v4/libpod" "github.com/containers/podman/v4/libpod/define" + "github.com/containers/podman/v4/pkg/namespaces" "github.com/containers/podman/v4/pkg/rootless" "github.com/containers/podman/v4/pkg/specgen" "github.com/containers/podman/v4/pkg/util" @@ -198,12 +199,18 @@ func namespaceOptions(s *specgen.SpecGenerator, rt *libpod.Runtime, pod *libpod. if !rootless.IsRootless() { return nil, errors.New("keep-id is only supported in rootless mode") } - toReturn = append(toReturn, libpod.WithAddCurrentUserPasswdEntry()) + opts, err := namespaces.UsernsMode(s.UserNS.String()).GetKeepIDOptions() + if err != nil { + return nil, err + } + if opts.UID == nil && opts.GID == nil { + toReturn = append(toReturn, libpod.WithAddCurrentUserPasswdEntry()) + } // If user is not overridden, set user in the container // to user running Podman. if s.User == "" { - _, uid, gid, err := util.GetKeepIDMapping() + _, uid, gid, err := util.GetKeepIDMapping(opts) if err != nil { return nil, err } diff --git a/pkg/specgen/namespaces.go b/pkg/specgen/namespaces.go index 03a2049f6..8cc0fe6a9 100644 --- a/pkg/specgen/namespaces.go +++ b/pkg/specgen/namespaces.go @@ -11,6 +11,7 @@ import ( "github.com/containers/common/pkg/cgroups" cutil "github.com/containers/common/pkg/util" "github.com/containers/podman/v4/libpod/define" + "github.com/containers/podman/v4/pkg/namespaces" "github.com/containers/podman/v4/pkg/util" "github.com/containers/storage" spec "github.com/opencontainers/runtime-spec/specs-go" @@ -308,6 +309,14 @@ func ParseUserNamespace(ns string) (Namespace, error) { case ns == "keep-id": toReturn.NSMode = KeepID return toReturn, nil + case strings.HasPrefix(ns, "keep-id:"): + split := strings.SplitN(ns, ":", 2) + if len(split) != 2 { + return toReturn, errors.New("invalid setting for keep-id: mode") + } + toReturn.NSMode = KeepID + toReturn.Value = split[1] + return toReturn, nil case ns == "nomap": toReturn.NSMode = NoMap return toReturn, nil @@ -490,7 +499,11 @@ func SetupUserNS(idmappings *storage.IDMappingOptions, userns Namespace, g *gene return user, err } case KeepID: - mappings, uid, gid, err := util.GetKeepIDMapping() + opts, err := namespaces.UsernsMode(userns.String()).GetKeepIDOptions() + if err != nil { + return user, err + } + mappings, uid, gid, err := util.GetKeepIDMapping(opts) if err != nil { return user, err } -- cgit v1.2.3-54-g00ecf