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fa1aa143ac
Add extended permissions logic to selinux. Extended permissions provides additional permissions in 256 bit increments. Extend the generic ioctl permission check to use the extended permissions for per-command filtering. Source/target/class sets including the ioctl permission may additionally include a set of commands. Example: allowxperm <source> <target>:<class> ioctl unpriv_app_socket_cmds auditallowxperm <source> <target>:<class> ioctl priv_gpu_cmds Where unpriv_app_socket_cmds and priv_gpu_cmds are macros representing commonly granted sets of ioctl commands. When ioctl commands are omitted only the permissions are checked. This feature is intended to provide finer granularity for the ioctl permission that may be too imprecise. For example, the same driver may use ioctls to provide important and benign functionality such as driver version or socket type as well as dangerous capabilities such as debugging features, read/write/execute to physical memory or access to sensitive data. Per-command filtering provides a mechanism to reduce the attack surface of the kernel, and limit applications to the subset of commands required. The format of the policy binary has been modified to include ioctl commands, and the policy version number has been incremented to POLICYDB_VERSION_XPERMS_IOCTL=30 to account for the format change. The extended permissions logic is deliberately generic to allow components to be reused e.g. netlink filters Signed-off-by: Jeff Vander Stoep <jeffv@google.com> Acked-by: Nick Kralevich <nnk@google.com> Signed-off-by: Paul Moore <pmoore@redhat.com>
267 lines
7.8 KiB
C
267 lines
7.8 KiB
C
/*
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* Security server interface.
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*
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* Author : Stephen Smalley, <sds@epoch.ncsc.mil>
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*
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*/
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#ifndef _SELINUX_SECURITY_H_
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#define _SELINUX_SECURITY_H_
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#include <linux/compiler.h>
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#include <linux/dcache.h>
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#include <linux/magic.h>
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#include <linux/types.h>
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#include "flask.h"
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#define SECSID_NULL 0x00000000 /* unspecified SID */
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#define SECSID_WILD 0xffffffff /* wildcard SID */
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#define SECCLASS_NULL 0x0000 /* no class */
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/* Identify specific policy version changes */
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#define POLICYDB_VERSION_BASE 15
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#define POLICYDB_VERSION_BOOL 16
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#define POLICYDB_VERSION_IPV6 17
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#define POLICYDB_VERSION_NLCLASS 18
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#define POLICYDB_VERSION_VALIDATETRANS 19
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#define POLICYDB_VERSION_MLS 19
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#define POLICYDB_VERSION_AVTAB 20
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#define POLICYDB_VERSION_RANGETRANS 21
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#define POLICYDB_VERSION_POLCAP 22
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#define POLICYDB_VERSION_PERMISSIVE 23
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#define POLICYDB_VERSION_BOUNDARY 24
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#define POLICYDB_VERSION_FILENAME_TRANS 25
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#define POLICYDB_VERSION_ROLETRANS 26
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#define POLICYDB_VERSION_NEW_OBJECT_DEFAULTS 27
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#define POLICYDB_VERSION_DEFAULT_TYPE 28
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#define POLICYDB_VERSION_CONSTRAINT_NAMES 29
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#define POLICYDB_VERSION_XPERMS_IOCTL 30
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/* Range of policy versions we understand*/
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#define POLICYDB_VERSION_MIN POLICYDB_VERSION_BASE
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#ifdef CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX
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#define POLICYDB_VERSION_MAX CONFIG_SECURITY_SELINUX_POLICYDB_VERSION_MAX_VALUE
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#else
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#define POLICYDB_VERSION_MAX POLICYDB_VERSION_XPERMS_IOCTL
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#endif
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/* Mask for just the mount related flags */
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#define SE_MNTMASK 0x0f
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/* Super block security struct flags for mount options */
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/* BE CAREFUL, these need to be the low order bits for selinux_get_mnt_opts */
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#define CONTEXT_MNT 0x01
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#define FSCONTEXT_MNT 0x02
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#define ROOTCONTEXT_MNT 0x04
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#define DEFCONTEXT_MNT 0x08
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#define SBLABEL_MNT 0x10
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/* Non-mount related flags */
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#define SE_SBINITIALIZED 0x0100
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#define SE_SBPROC 0x0200
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#define SE_SBGENFS 0x0400
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#define CONTEXT_STR "context="
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#define FSCONTEXT_STR "fscontext="
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#define ROOTCONTEXT_STR "rootcontext="
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#define DEFCONTEXT_STR "defcontext="
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#define LABELSUPP_STR "seclabel"
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struct netlbl_lsm_secattr;
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extern int selinux_enabled;
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/* Policy capabilities */
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enum {
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POLICYDB_CAPABILITY_NETPEER,
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POLICYDB_CAPABILITY_OPENPERM,
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POLICYDB_CAPABILITY_REDHAT1,
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POLICYDB_CAPABILITY_ALWAYSNETWORK,
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__POLICYDB_CAPABILITY_MAX
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};
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#define POLICYDB_CAPABILITY_MAX (__POLICYDB_CAPABILITY_MAX - 1)
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extern int selinux_policycap_netpeer;
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extern int selinux_policycap_openperm;
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extern int selinux_policycap_alwaysnetwork;
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/*
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* type_datum properties
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* available at the kernel policy version >= POLICYDB_VERSION_BOUNDARY
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*/
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#define TYPEDATUM_PROPERTY_PRIMARY 0x0001
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#define TYPEDATUM_PROPERTY_ATTRIBUTE 0x0002
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/* limitation of boundary depth */
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#define POLICYDB_BOUNDS_MAXDEPTH 4
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int security_mls_enabled(void);
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int security_load_policy(void *data, size_t len);
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int security_read_policy(void **data, size_t *len);
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size_t security_policydb_len(void);
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int security_policycap_supported(unsigned int req_cap);
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#define SEL_VEC_MAX 32
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struct av_decision {
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u32 allowed;
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u32 auditallow;
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u32 auditdeny;
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u32 seqno;
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u32 flags;
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};
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#define XPERMS_ALLOWED 1
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#define XPERMS_AUDITALLOW 2
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#define XPERMS_DONTAUDIT 4
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#define security_xperm_set(perms, x) (perms[x >> 5] |= 1 << (x & 0x1f))
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#define security_xperm_test(perms, x) (1 & (perms[x >> 5] >> (x & 0x1f)))
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struct extended_perms_data {
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u32 p[8];
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};
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struct extended_perms_decision {
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u8 used;
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u8 driver;
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struct extended_perms_data *allowed;
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struct extended_perms_data *auditallow;
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struct extended_perms_data *dontaudit;
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};
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struct extended_perms {
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u16 len; /* length associated decision chain */
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struct extended_perms_data drivers; /* flag drivers that are used */
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};
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/* definitions of av_decision.flags */
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#define AVD_FLAGS_PERMISSIVE 0x0001
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void security_compute_av(u32 ssid, u32 tsid,
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u16 tclass, struct av_decision *avd,
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struct extended_perms *xperms);
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void security_compute_xperms_decision(u32 ssid, u32 tsid, u16 tclass,
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u8 driver, struct extended_perms_decision *xpermd);
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void security_compute_av_user(u32 ssid, u32 tsid,
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u16 tclass, struct av_decision *avd);
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int security_transition_sid(u32 ssid, u32 tsid, u16 tclass,
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const struct qstr *qstr, u32 *out_sid);
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int security_transition_sid_user(u32 ssid, u32 tsid, u16 tclass,
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const char *objname, u32 *out_sid);
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int security_member_sid(u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_change_sid(u32 ssid, u32 tsid,
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u16 tclass, u32 *out_sid);
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int security_sid_to_context(u32 sid, char **scontext,
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u32 *scontext_len);
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int security_sid_to_context_force(u32 sid, char **scontext, u32 *scontext_len);
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int security_context_to_sid(const char *scontext, u32 scontext_len,
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u32 *out_sid, gfp_t gfp);
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int security_context_to_sid_default(const char *scontext, u32 scontext_len,
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u32 *out_sid, u32 def_sid, gfp_t gfp_flags);
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int security_context_to_sid_force(const char *scontext, u32 scontext_len,
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u32 *sid);
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int security_get_user_sids(u32 callsid, char *username,
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u32 **sids, u32 *nel);
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int security_port_sid(u8 protocol, u16 port, u32 *out_sid);
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int security_netif_sid(char *name, u32 *if_sid);
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int security_node_sid(u16 domain, void *addr, u32 addrlen,
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u32 *out_sid);
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int security_validate_transition(u32 oldsid, u32 newsid, u32 tasksid,
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u16 tclass);
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int security_bounded_transition(u32 oldsid, u32 newsid);
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int security_sid_mls_copy(u32 sid, u32 mls_sid, u32 *new_sid);
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int security_net_peersid_resolve(u32 nlbl_sid, u32 nlbl_type,
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u32 xfrm_sid,
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u32 *peer_sid);
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int security_get_classes(char ***classes, int *nclasses);
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int security_get_permissions(char *class, char ***perms, int *nperms);
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int security_get_reject_unknown(void);
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int security_get_allow_unknown(void);
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#define SECURITY_FS_USE_XATTR 1 /* use xattr */
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#define SECURITY_FS_USE_TRANS 2 /* use transition SIDs, e.g. devpts/tmpfs */
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#define SECURITY_FS_USE_TASK 3 /* use task SIDs, e.g. pipefs/sockfs */
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#define SECURITY_FS_USE_GENFS 4 /* use the genfs support */
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#define SECURITY_FS_USE_NONE 5 /* no labeling support */
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#define SECURITY_FS_USE_MNTPOINT 6 /* use mountpoint labeling */
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#define SECURITY_FS_USE_NATIVE 7 /* use native label support */
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#define SECURITY_FS_USE_MAX 7 /* Highest SECURITY_FS_USE_XXX */
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int security_fs_use(struct super_block *sb);
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int security_genfs_sid(const char *fstype, char *name, u16 sclass,
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u32 *sid);
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#ifdef CONFIG_NETLABEL
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int security_netlbl_secattr_to_sid(struct netlbl_lsm_secattr *secattr,
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u32 *sid);
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int security_netlbl_sid_to_secattr(u32 sid,
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struct netlbl_lsm_secattr *secattr);
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#else
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static inline int security_netlbl_secattr_to_sid(
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struct netlbl_lsm_secattr *secattr,
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u32 *sid)
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{
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return -EIDRM;
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}
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static inline int security_netlbl_sid_to_secattr(u32 sid,
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struct netlbl_lsm_secattr *secattr)
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{
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return -ENOENT;
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}
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#endif /* CONFIG_NETLABEL */
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const char *security_get_initial_sid_context(u32 sid);
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/*
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* status notifier using mmap interface
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*/
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extern struct page *selinux_kernel_status_page(void);
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#define SELINUX_KERNEL_STATUS_VERSION 1
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struct selinux_kernel_status {
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u32 version; /* version number of thie structure */
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u32 sequence; /* sequence number of seqlock logic */
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u32 enforcing; /* current setting of enforcing mode */
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u32 policyload; /* times of policy reloaded */
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u32 deny_unknown; /* current setting of deny_unknown */
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/*
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* The version > 0 supports above members.
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*/
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} __packed;
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extern void selinux_status_update_setenforce(int enforcing);
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extern void selinux_status_update_policyload(int seqno);
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extern void selinux_complete_init(void);
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extern int selinux_disable(void);
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extern void exit_sel_fs(void);
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extern struct path selinux_null;
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extern struct vfsmount *selinuxfs_mount;
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extern void selnl_notify_setenforce(int val);
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extern void selnl_notify_policyload(u32 seqno);
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extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
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#endif /* _SELINUX_SECURITY_H_ */
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