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From e3f34eb2e0edc9cefe92e58e2ad4c98bcccf2090 Mon Sep 17 00:00:00 2001
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From: Lukas Nykryn <lnykryn@redhat.com>
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Date: Thu, 27 Aug 2015 10:33:15 +0200
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Subject: [PATCH] selinux: fix check for transient units
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SELinux does not have a path to check for a snapshot service creation.
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This ends up giving us a bogus check.
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On snapshot creation we should check if the remote process type, has the
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ability to start a service with the type that systemd is running with.
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Based on patch from Vaclav Pavlin and Dan Walsh
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http://lists.freedesktop.org/archives/systemd-devel/2013-November/014021.html
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RHEL only
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Resolves: #1255129
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---
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src/core/dbus-manager.c | 4 ++--
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src/core/selinux-access.c | 11 ++++++-----
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src/core/selinux-access.h | 9 ++++++---
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3 files changed, 14 insertions(+), 10 deletions(-)
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diff --git a/src/core/dbus-manager.c b/src/core/dbus-manager.c
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index 2bc37ba60..1ec350e03 100644
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--- a/src/core/dbus-manager.c
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+++ b/src/core/dbus-manager.c
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@@ -734,7 +734,7 @@ static int method_start_transient_unit(sd_bus *bus, sd_bus_message *message, voi
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if (mode < 0)
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return sd_bus_error_setf(error, SD_BUS_ERROR_INVALID_ARGS, "Job mode %s is invalid.", smode);
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- r = mac_selinux_access_check(message, "start", error);
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+ r = mac_selinux_runtime_unit_access_check(message, "start", error);
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if (r < 0)
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return r;
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@@ -1092,7 +1092,7 @@ static int method_create_snapshot(sd_bus *bus, sd_bus_message *message, void *us
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assert(message);
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assert(m);
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- r = mac_selinux_access_check(message, "start", error);
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+ r = mac_selinux_runtime_unit_access_check(message, "start", error);
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if (r < 0)
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return r;
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diff --git a/src/core/selinux-access.c b/src/core/selinux-access.c
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index ce4f39459..91460b8af 100644
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--- a/src/core/selinux-access.c
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+++ b/src/core/selinux-access.c
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@@ -175,6 +175,7 @@ void mac_selinux_access_free(void) {
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*/
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int mac_selinux_generic_access_check(
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sd_bus_message *message,
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+ bool system,
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const char *path,
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const char *permission,
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sd_bus_error *error) {
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@@ -213,7 +214,9 @@ int mac_selinux_generic_access_check(
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if (r < 0)
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goto finish;
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- if (path) {
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+ tclass = "service";
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+
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+ if (path && !system) {
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/* Get the file context of the unit file */
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r = getfilecon(path, &fcon);
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@@ -221,16 +224,14 @@ int mac_selinux_generic_access_check(
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r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to get file context on %s.", path);
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goto finish;
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}
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-
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- tclass = "service";
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} else {
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r = getcon(&fcon);
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if (r < 0) {
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r = sd_bus_error_setf(error, SD_BUS_ERROR_ACCESS_DENIED, "Failed to get current context.");
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goto finish;
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}
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-
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- tclass = "system";
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+ if (system)
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+ tclass = "system";
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}
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sd_bus_creds_get_cmdline(creds, &cmdline);
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diff --git a/src/core/selinux-access.h b/src/core/selinux-access.h
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index dd1e8bb9d..7dc271b35 100644
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--- a/src/core/selinux-access.h
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+++ b/src/core/selinux-access.h
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@@ -28,21 +28,24 @@
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void mac_selinux_access_free(void);
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-int mac_selinux_generic_access_check(sd_bus_message *message, const char *path, const char *permission, sd_bus_error *error);
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+int mac_selinux_generic_access_check(sd_bus_message *message, bool system, const char *path, const char *permission, sd_bus_error *error);
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int mac_selinux_unit_access_check_strv(char **units, sd_bus_message *message, Manager *m, const char *permission, sd_bus_error *error);
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#ifdef HAVE_SELINUX
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#define mac_selinux_access_check(message, permission, error) \
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- mac_selinux_generic_access_check((message), NULL, (permission), (error))
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+ mac_selinux_generic_access_check((message), true, NULL, (permission), (error))
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#define mac_selinux_unit_access_check(unit, message, permission, error) \
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({ \
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Unit *_unit = (unit); \
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- mac_selinux_generic_access_check((message), _unit->source_path ?: _unit->fragment_path, (permission), (error)); \
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+ mac_selinux_generic_access_check((message), false, _unit->source_path ?: _unit->fragment_path, (permission), (error)); \
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})
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+#define mac_selinux_runtime_unit_access_check(message, permission, error) \
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+ mac_selinux_generic_access_check((message), false, NULL, (permission), (error))
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+
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#else
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#define mac_selinux_access_check(message, permission, error) 0
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