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| author | Richard Weinberger | 2013-06-18 10:35:44 +0200 |
|---|---|---|
| committer | Karel Zak | 2013-06-18 10:35:44 +0200 |
| commit | 6b9e5bf670c70690d44b8ce4055e1997fb0b6496 (patch) | |
| tree | 68c2dbf9136349b6eba1dfb659cf73c3c399e7ea /sys-utils/nsenter.c | |
| parent | cal: fix -y output for UTF8 (diff) | |
| download | kernel-qcow2-util-linux-6b9e5bf670c70690d44b8ce4055e1997fb0b6496.tar.gz kernel-qcow2-util-linux-6b9e5bf670c70690d44b8ce4055e1997fb0b6496.tar.xz kernel-qcow2-util-linux-6b9e5bf670c70690d44b8ce4055e1997fb0b6496.zip | |
nsenter: Allow selecting the uid and gid to be used in the entered userns
Using -S (--setuid) and -G (--setgid) one can select the uid/gid which
will be used in the entered user namespace.
[kzak@redhat.com: - use setuid/gid unconditionally (always),
- update man page]
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/nsenter.c')
| -rw-r--r-- | sys-utils/nsenter.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/sys-utils/nsenter.c b/sys-utils/nsenter.c index 106349c7e..3d9ae2fb0 100644 --- a/sys-utils/nsenter.c +++ b/sys-utils/nsenter.c @@ -72,6 +72,8 @@ static void usage(int status) fputs(_(" -n, --net [=<file>] enter network namespace\n"), out); fputs(_(" -p, --pid [=<file>] enter pid namespace\n"), out); fputs(_(" -U, --user [=<file>] enter user namespace\n"), out); + fputs(_(" -S, --setuid <uid> set uid in user namespace\n"), out); + fputs(_(" -G, --setgid <gid> set gid in user namespace\n"), out); fputs(_(" -r, --root [=<dir>] set the root directory\n"), out); fputs(_(" -w, --wd [=<dir>] set the working directory\n"), out); fputs(_(" -F, --no-fork do not fork before exec'ing <program>\n"), out); @@ -169,6 +171,8 @@ int main(int argc, char *argv[]) { "net", optional_argument, NULL, 'n' }, { "pid", optional_argument, NULL, 'p' }, { "user", optional_argument, NULL, 'U' }, + { "setuid", required_argument, NULL, 'S' }, + { "setgid", required_argument, NULL, 'G' }, { "root", optional_argument, NULL, 'r' }, { "wd", optional_argument, NULL, 'w' }, { "no-fork", no_argument, NULL, 'F' }, @@ -179,6 +183,8 @@ int main(int argc, char *argv[]) int c, namespaces = 0; bool do_rd = false, do_wd = false; int do_fork = -1; /* unknown yet */ + uid_t uid = 0; + gid_t gid = 0; setlocale(LC_MESSAGES, ""); bindtextdomain(PACKAGE, LOCALEDIR); @@ -186,7 +192,7 @@ int main(int argc, char *argv[]) atexit(close_stdout); while ((c = - getopt_long(argc, argv, "hVt:m::u::i::n::p::U::r::w::F", + getopt_long(argc, argv, "hVt:m::u::i::n::p::U::S:G:r::w::F", longopts, NULL)) != -1) { switch (c) { case 'h': @@ -234,6 +240,12 @@ int main(int argc, char *argv[]) else namespaces |= CLONE_NEWUSER; break; + case 'S': + uid = strtoul_or_err(optarg, _("failed to parse uid")); + break; + case 'G': + gid = strtoul_or_err(optarg, _("failed to parse gid")); + break; case 'F': do_fork = 0; break; @@ -315,6 +327,13 @@ int main(int argc, char *argv[]) if (do_fork == 1) continue_as_child(); + if (namespaces & CLONE_NEWUSER) { + if (setuid(uid) < 0) + err(EXIT_FAILURE, _("setuid failed")); + if (setgid(gid) < 0) + err(EXIT_FAILURE, _("setgid failed")); + } + if (optind < argc) { execvp(argv[optind], argv + optind); err(EXIT_FAILURE, _("failed to execute %s"), argv[optind]); |