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* [PATCH v5 00/27] LSM: Module stacking for AppArmor
@ 2019-07-26 23:38 Casey Schaufler
  2019-07-26 23:38 ` [PATCH 01/27] LSM: Infrastructure management of the sock security Casey Schaufler
                   ` (26 more replies)
  0 siblings, 27 replies; 35+ messages in thread
From: Casey Schaufler @ 2019-07-26 23:38 UTC (permalink / raw)
  To: casey.schaufler, jmorris, linux-security-module, selinux
  Cc: casey, keescook, john.johansen, penguin-kernel, paul, sds

This patchset provides the changes required for
the AppArmor security module to stack safely with any other.

v6: Incorporate feedback from v5
    - Add subj_<lsm>= and obj_<lsm>= fields to audit records
    - Add /proc/.../attr/context to get the full context in
      lsmname\0value\0... format as suggested by Simon McVittie
    - Add SO_PEERCONTEXT for getsockopt() to get the full context
      in the same format, also suggested by Simon McVittie.
    - Add /sys/kernel/security/lsm_display_default to provide
      the display default value.
v5: Incorporate feedback from v4
    - Initialize the lsmcontext in security_secid_to_secctx()
    - Clear the lsmcontext in all security_release_secctx() cases
    - Don't use the "display" on strictly internal context
      interfaces.
    - The SELinux binder hooks check for cases where the context
      "display" isn't compatible with SELinux.

v4: Incorporate feedback from v3
    - Mark new lsm_<blob>_alloc functions static
    - Replace the lsm and slot fields of the security_hook_list
      with a pointer to a LSM allocated lsm_id structure. The
      LSM identifies if it needs a slot explicitly. Use the
      lsm_id rather than make security_add_hooks return the
      slot value.
    - Validate slot values used in security.c
    - Reworked the "display" process attribute handling so that
      it works right and doesn't use goofy list processing.
    - fix display value check in dentry_init_security
    - Replace audit_log of secids with '?' instead of deleting
      the audit log

v3: Incorporate feedback from v2
    - Make lsmblob parameter and variable names more
      meaningful, changing "le" and "l" to "blob".
    - Improve consistency of constant naming.
    - Do more sanity checking during LSM initialization.
    - Be a bit clearer about what is temporary scaffolding.
    - Rather than clutter security_getpeersec_dgram with
      otherwise unnecessary checks remove the apparmor
      stub, which does nothing useful.

Patches 0001-0003 complete the process of moving management
of security blobs that might be shared from the individual
modules to the infrastructure.

Patches 0004-0014 replace system use of a "secid" with
a structure "lsmblob" containing information from the
security modules to be held and reused later. At this
point lsmblob contains an array of u32 secids, one "slot"
for each of the security modules compiled into the
kernel that used secids. A "slot" is allocated when
a security module requests one.
The infrastructure is changed to use the slot number
to pass the correct secid to or from the security module
hooks.

It is important that the lsmblob be a fixed size entity
that does not have to be allocated. Several of the places
where it is used would have performance and/or locking
issues with dynamic allocation.

Patch 0015 provides a mechanism for a process to
identify which security module's hooks should be used
when displaying or converting a security context string.
A new interface /proc/.../attr/display contains the name
of the security module to show. Reading from this file
will present the name of the module, while writing to
it will set the value. Only names of active security
modules are accepted. Internally, the name is translated
to the appropriate "slot" number for the module which
is then stored in the task security blob.

Patch 0016 Starts the process of changing how a security
context is represented. Since it is possible for a
security context to have been generated by more than one
security module it is now necessary to note which module
created a security context so that the correct "release"
hook can be called. There are several places where the
module that created a security context cannot be inferred.

This is achieved by introducing a "lsmcontext" structure
which contains the context string, its length and the
"slot" number of the security module that created it.
The security_release_secctx() interface is changed,
replacing the (string,len) pointer pair with a lsmcontext
pointer.

Patches 0017-0019 convert the security interfaces from
(string,len) pointer pairs to a lsmcontext pointer.
The slot number identifying the creating module is
added by the infrastructure. Where the security context
is stored for extended periods the data type is changed.

The Netlabel code is converted to save lsmblob structures
instead of secids in Patch 0020.

Patch 0021 adds checks to the SELinux binder hooks
which verify that if either "display" used is SELinux
both are.

Patches 0022-23 add addition data to the audit records
to identify the LSM specific data for all active
modules.

Patches 0024-0026 add new interfaces for getting the
compound security contexts.

Finally, with all interference on the AppArmor hooks
removed, Patch 0027 removes the exclusive bit from
AppArmor. An unnecessary stub hook was also removed.

The Ubuntu project is using an earlier version of
this patchset in their distribution to enable stacking
for containers.

Performance measurements to date have the change
within the "noise". Better benchmarks are in the
works.

https://github.com/cschaufler/lsm-stacking.git#stack-5.2-v6-apparmor

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 drivers/android/binder.c                |  24 +-
 fs/kernfs/dir.c                         |   5 +-
 fs/kernfs/inode.c                       |  35 +--
 fs/kernfs/kernfs-internal.h             |   3 +-
 fs/nfs/nfs4proc.c                       |  22 +-
 fs/nfsd/nfs4xdr.c                       |  20 +-
 fs/proc/base.c                          |   1 +
 include/linux/cred.h                    |   3 +-
 include/linux/lsm_hooks.h               |  28 +-
 include/linux/security.h                | 169 +++++++++---
 include/net/af_unix.h                   |   2 +-
 include/net/netlabel.h                  |   8 +-
 include/net/scm.h                       |  14 +-
 kernel/audit.c                          |  34 +--
 kernel/audit.h                          |   5 +-
 kernel/auditfilter.c                    |   9 +-
 kernel/auditsc.c                        |  83 +++---
 kernel/cred.c                           |  12 +-
 net/ipv4/cipso_ipv4.c                   |   6 +-
 net/ipv4/ip_sockglue.c                  |  12 +-
 net/netfilter/nf_conntrack_netlink.c    |  20 +-
 net/netfilter/nf_conntrack_standalone.c |  11 +-
 net/netfilter/nfnetlink_queue.c         |  26 +-
 net/netfilter/nft_meta.c                |  13 +-
 net/netfilter/xt_SECMARK.c              |   5 +-
 net/netlabel/netlabel_kapi.c            |   6 +-
 net/netlabel/netlabel_unlabeled.c       |  95 ++++---
 net/netlabel/netlabel_unlabeled.h       |   2 +-
 net/netlabel/netlabel_user.c            |  13 +-
 net/netlabel/netlabel_user.h            |   6 +-
 net/unix/af_unix.c                      |   6 +-
 security/apparmor/include/net.h         |   6 +-
 security/apparmor/lsm.c                 |  65 ++---
 security/commoncap.c                    |   7 +-
 security/integrity/ima/ima.h            |  14 +-
 security/integrity/ima/ima_api.c        |   9 +-
 security/integrity/ima/ima_appraise.c   |   6 +-
 security/integrity/ima/ima_main.c       |  36 +--
 security/integrity/ima/ima_policy.c     |  19 +-
 security/loadpin/loadpin.c              |   8 +-
 security/safesetid/lsm.c                |   8 +-
 security/security.c                     | 445 ++++++++++++++++++++++++++++----
 security/selinux/hooks.c                | 201 ++++++++-------
 security/selinux/include/objsec.h       |  18 ++
 security/selinux/include/security.h     |   1 +
 security/selinux/netlabel.c             |  25 +-
 security/selinux/ss/services.c          |   7 +-
 security/smack/smack.h                  |  19 ++
 security/smack/smack_lsm.c              | 156 ++++++-----
 security/smack/smack_netfilter.c        |   8 +-
 security/smack/smackfs.c                |  10 +-
 security/tomoyo/tomoyo.c                |   8 +-
 security/yama/yama_lsm.c                |   7 +-
 53 files changed, 1167 insertions(+), 614 deletions(-)

^ permalink raw reply	[flat|nested] 35+ messages in thread

end of thread, other threads:[~2019-07-29 21:40 UTC | newest]

Thread overview: 35+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-07-26 23:38 [PATCH v5 00/27] LSM: Module stacking for AppArmor Casey Schaufler
2019-07-26 23:38 ` [PATCH 01/27] LSM: Infrastructure management of the sock security Casey Schaufler
2019-07-26 23:38 ` [PATCH 02/27] LSM: Infrastructure management of the key blob Casey Schaufler
2019-07-26 23:38 ` [PATCH 03/27] LSM: Create and manage the lsmblob data structure Casey Schaufler
2019-07-26 23:39 ` [PATCH 04/27] LSM: Use lsmblob in security_audit_rule_match Casey Schaufler
2019-07-26 23:39 ` [PATCH 05/27] LSM: Use lsmblob in security_kernel_act_as Casey Schaufler
2019-07-26 23:39 ` [PATCH 06/27] net: Prepare UDS for security module stacking Casey Schaufler
2019-07-26 23:39 ` [PATCH 07/27] LSM: Use lsmblob in security_secctx_to_secid Casey Schaufler
2019-07-26 23:39 ` [PATCH 08/27] LSM: Use lsmblob in security_secid_to_secctx Casey Schaufler
2019-07-26 23:39 ` [PATCH 09/27] LSM: Use lsmblob in security_ipc_getsecid Casey Schaufler
2019-07-26 23:39 ` [PATCH 10/27] LSM: Use lsmblob in security_task_getsecid Casey Schaufler
2019-07-26 23:39 ` [PATCH 11/27] LSM: Use lsmblob in security_inode_getsecid Casey Schaufler
2019-07-26 23:39 ` [PATCH 12/27] LSM: Use lsmblob in security_cred_getsecid Casey Schaufler
2019-07-26 23:39 ` [PATCH 13/27] IMA: Change internal interfaces to use lsmblobs Casey Schaufler
2019-07-26 23:39 ` [PATCH 14/27] LSM: Specify which LSM to display Casey Schaufler
2019-07-29 17:05   ` Kees Cook
2019-07-26 23:39 ` [PATCH 15/27] LSM: Ensure the correct LSM context releaser Casey Schaufler
2019-07-26 23:39 ` [PATCH 16/27] LSM: Use lsmcontext in security_secid_to_secctx Casey Schaufler
2019-07-26 23:39 ` [PATCH 17/27] LSM: Use lsmcontext in security_dentry_init_security Casey Schaufler
2019-07-26 23:39 ` [PATCH 18/27] LSM: Use lsmcontext in security_inode_getsecctx Casey Schaufler
2019-07-26 23:39 ` [PATCH 19/27] LSM: security_secid_to_secctx in netlink netfilter Casey Schaufler
2019-07-26 23:39 ` [PATCH 20/27] NET: Store LSM netlabel data in a lsmblob Casey Schaufler
2019-07-26 23:39 ` [PATCH 21/27] SELinux: Verify LSM display sanity in binder Casey Schaufler
2019-07-26 23:39 ` [PATCH 22/27] Audit: Add subj_LSM fields when necessary Casey Schaufler
2019-07-26 23:39 ` [PATCH 23/27] Audit: Include object data for all security modules Casey Schaufler
2019-07-26 23:39 ` [PATCH 24/27] LSM: Provide an user space interface for the default display Casey Schaufler
2019-07-29 17:15   ` Kees Cook
2019-07-26 23:39 ` [PATCH 25/27] NET: Add SO_PEERCONTEXT for multiple LSMs Casey Schaufler
2019-07-29 13:00   ` Simon McVittie
2019-07-29 15:04     ` Casey Schaufler
2019-07-26 23:39 ` [PATCH 26/27] LSM: Add /proc attr entry for full LSM context Casey Schaufler
2019-07-29 17:19   ` Kees Cook
2019-07-29 19:22     ` Casey Schaufler
2019-07-29 21:40       ` Kees Cook
2019-07-26 23:39 ` [PATCH 27/27] AppArmor: Remove the exclusive flag Casey Schaufler

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