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authorStephen Smalley <sds@tycho.nsa.gov>2016-04-08 13:52:00 -0400
committerPaul Moore <paul@paul-moore.com>2016-04-26 15:41:43 -0400
commit8e4ff6f228e4722cac74db716e308d1da33d744f (patch)
treedb853a9321a0a656a7cb232b5328b17689ccf18e
parent1ac42476263eec99fb2d3c31ee946cb44e80ddd5 (diff)
selinux: distinguish non-init user namespace capability checks
Distinguish capability checks against a target associated with the init user namespace versus capability checks against a target associated with a non-init user namespace by defining and using separate security classes for the latter. This is needed to support e.g. Chrome usage of user namespaces for the Chrome sandbox without needing to allow Chrome to also exercise capabilities on targets in the init user namespace. Suggested-by: Dan Walsh <dwalsh@redhat.com> Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <paul@paul-moore.com>
-rw-r--r--security/selinux/hooks.c14
-rw-r--r--security/selinux/include/classmap.h28
2 files changed, 25 insertions, 17 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 474011c46bbd..bbff80c6d3f2 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -1631,7 +1631,7 @@ static int current_has_perm(const struct task_struct *tsk,
/* Check whether a task is allowed to use a capability. */
static int cred_has_capability(const struct cred *cred,
- int cap, int audit)
+ int cap, int audit, bool initns)
{
struct common_audit_data ad;
struct av_decision avd;
@@ -1645,10 +1645,10 @@ static int cred_has_capability(const struct cred *cred,
switch (CAP_TO_INDEX(cap)) {
case 0:
- sclass = SECCLASS_CAPABILITY;
+ sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
break;
case 1:
- sclass = SECCLASS_CAPABILITY2;
+ sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
break;
default:
printk(KERN_ERR
@@ -2152,7 +2152,7 @@ static int selinux_capset(struct cred *new, const struct cred *old,
static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
int cap, int audit)
{
- return cred_has_capability(cred, cap, audit);
+ return cred_has_capability(cred, cap, audit, ns == &init_user_ns);
}
static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
@@ -2230,7 +2230,7 @@ static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
int rc, cap_sys_admin = 0;
rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN,
- SECURITY_CAP_NOAUDIT);
+ SECURITY_CAP_NOAUDIT, true);
if (rc == 0)
cap_sys_admin = 1;
@@ -3213,7 +3213,7 @@ static int selinux_inode_getsecurity(struct inode *inode, const char *name, void
SECURITY_CAP_NOAUDIT);
if (!error)
error = cred_has_capability(current_cred(), CAP_MAC_ADMIN,
- SECURITY_CAP_NOAUDIT);
+ SECURITY_CAP_NOAUDIT, true);
isec = inode_security(inode);
if (!error)
error = security_sid_to_context_force(isec->sid, &context,
@@ -3390,7 +3390,7 @@ static int selinux_file_ioctl(struct file *file, unsigned int cmd,
case KDSKBENT:
case KDSKBSENT:
error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
- SECURITY_CAP_AUDIT);
+ SECURITY_CAP_AUDIT, true);
break;
/* default case assumes that the command will go
diff --git a/security/selinux/include/classmap.h b/security/selinux/include/classmap.h
index 8fbd1383d75e..1f1f4b2f6018 100644
--- a/security/selinux/include/classmap.h
+++ b/security/selinux/include/classmap.h
@@ -12,6 +12,18 @@
#define COMMON_IPC_PERMS "create", "destroy", "getattr", "setattr", "read", \
"write", "associate", "unix_read", "unix_write"
+#define COMMON_CAP_PERMS "chown", "dac_override", "dac_read_search", \
+ "fowner", "fsetid", "kill", "setgid", "setuid", "setpcap", \
+ "linux_immutable", "net_bind_service", "net_broadcast", \
+ "net_admin", "net_raw", "ipc_lock", "ipc_owner", "sys_module", \
+ "sys_rawio", "sys_chroot", "sys_ptrace", "sys_pacct", "sys_admin", \
+ "sys_boot", "sys_nice", "sys_resource", "sys_time", \
+ "sys_tty_config", "mknod", "lease", "audit_write", \
+ "audit_control", "setfcap"
+
+#define COMMON_CAP2_PERMS "mac_override", "mac_admin", "syslog", \
+ "wake_alarm", "block_suspend", "audit_read"
+
/*
* Note: The name for any socket class should be suffixed by "socket",
* and doesn't contain more than one substr of "socket".
@@ -34,14 +46,7 @@ struct security_class_mapping secclass_map[] = {
{ "ipc_info", "syslog_read", "syslog_mod",
"syslog_console", "module_request", "module_load", NULL } },
{ "capability",
- { "chown", "dac_override", "dac_read_search",
- "fowner", "fsetid", "kill", "setgid", "setuid", "setpcap",
- "linux_immutable", "net_bind_service", "net_broadcast",
- "net_admin", "net_raw", "ipc_lock", "ipc_owner", "sys_module",
- "sys_rawio", "sys_chroot", "sys_ptrace", "sys_pacct", "sys_admin",
- "sys_boot", "sys_nice", "sys_resource", "sys_time",
- "sys_tty_config", "mknod", "lease", "audit_write",
- "audit_control", "setfcap", NULL } },
+ { COMMON_CAP_PERMS, NULL } },
{ "filesystem",
{ "mount", "remount", "unmount", "getattr",
"relabelfrom", "relabelto", "associate", "quotamod",
@@ -150,12 +155,15 @@ struct security_class_mapping secclass_map[] = {
{ "memprotect", { "mmap_zero", NULL } },
{ "peer", { "recv", NULL } },
{ "capability2",
- { "mac_override", "mac_admin", "syslog", "wake_alarm", "block_suspend",
- "audit_read", NULL } },
+ { COMMON_CAP2_PERMS, NULL } },
{ "kernel_service", { "use_as_override", "create_files_as", NULL } },
{ "tun_socket",
{ COMMON_SOCK_PERMS, "attach_queue", NULL } },
{ "binder", { "impersonate", "call", "set_context_mgr", "transfer",
NULL } },
+ { "cap_userns",
+ { COMMON_CAP_PERMS, NULL } },
+ { "cap2_userns",
+ { COMMON_CAP2_PERMS, NULL } },
{ NULL }
};