Commit Graph

456841 Commits

Author SHA1 Message Date
Dmitry Kasatkin
272a6e90ff ima: no need to allocate entry for comment
If a rule is a comment, there is no need to allocate an entry.
Move the checking for comments before allocating the entry.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-10-11 23:28:07 -04:00
Dmitry Kasatkin
78bb5d0b4f ima: report policy load status
Audit messages are rate limited, often causing the policy update
info to not be visible.  Report policy loading status also using
pr_info.

Changes in v2:
* reporting moved to ima_release_policy to notice parsing errors
* reporting both completed and failed status

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-10-11 23:25:25 -04:00
Dmitry Kasatkin
456f5fd3f6 ima: use path names cache
__getname() uses slab allocation which is faster than kmalloc.
Make use of it.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-10-07 14:32:54 -04:00
Dmitry Kasatkin
c2baec7ffa evm: skip replacing EVM signature with HMAC on read-only filesystem
If filesystem is mounted read-only or file is immutable, updating
xattr will fail. This is a usual case during early boot until
filesystem is remount read-write. This patch verifies conditions
to skip unnecessary attempt to calculate HMAC and set xattr.

Changes in v2:
* indention changed according to Lindent (requested by Mimi)

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-10-07 14:32:53 -04:00
Dmitry Kasatkin
d16a8585d3 integrity: add missing '__init' keyword for integrity_init_keyring()
integrity_init_keyring() is used only from kernel '__init'
functions. Add it there as well.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-10-07 14:32:53 -04:00
Dmitry Kasatkin
0f34a0060a ima: check ima_policy_flag in the ima_file_free() hook
This patch completes the switching to the 'ima_policy_flag' variable
in the checks at the beginning of IMA functions, starting with the
commit a756024e.

Checking 'iint_initialized' is completely unnecessary, because
S_IMA flag is unset if iint was not allocated. At the same time
the integrity cache is allocated with SLAB_PANIC and the kernel will
panic if the allocation fails during kernel initialization. So on
a running system iint_initialized is always true and can be removed.

Changes in v3:
* not limiting test to IMA_APPRAISE (spotted by Roberto Sassu)

Changes in v2:
* 'iint_initialized' removal patch merged to this patch (requested
   by Mimi)

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Acked-by: Roberto Sassu <roberto.sassu@polito.it>
2014-10-07 14:32:52 -04:00
Dmitry Kasatkin
594081ee71 integrity: do zero padding of the key id
Latest KEYS code return error if hexadecimal string length id odd.
Fix it.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-06 17:33:27 +01:00
Dmitry Kasatkin
d401658985 KEYS: output last portion of fingerprint in /proc/keys
Previous version of KEYS used to output last 4 bytes of fingerprint.
Now it outputs 8 last bytes of raw subject, which does not make any
visual meaning at all. This patch restores old behavior.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-06 17:33:27 +01:00
Dmitry Kasatkin
7a224e783a KEYS: strip 'id:' from ca_keyid
The 'id:' prefix must be stripped for asymmetric_key_hex_to_key_id() to be
able to process ca_keyid.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-06 17:33:27 +01:00
Dmitry Kasatkin
8dd609805b KEYS: use swapped SKID for performing partial matching
Earlier KEYS code used pure subject key identifiers (fingerprint)
for searching keys. Latest merged code removed that and broke
compatibility with integrity subsytem signatures and original
format of module signatures.

This patch returns back partial matching on SKID.

Reported-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-06 16:56:08 +01:00
Dmitry Kasatkin
f1b731dbc2 KEYS: Restore partial ID matching functionality for asymmetric keys
Bring back the functionality whereby an asymmetric key can be matched with a
partial match on one of its IDs.

Whilst we're at it, allow for the possibility of having an increased number of
IDs.

Reported-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-06 15:21:05 +01:00
David Howells
dd2f6c4481 X.509: If available, use the raw subjKeyId to form the key description
Module signing matches keys by comparing against the key description exactly.
However, the way the key description gets constructed got changed to be
composed of the subject name plus the certificate serial number instead of the
subject name and the subjectKeyId.  I changed this to avoid problems with
certificates that don't *have* a subjectKeyId.

Instead, if available, use the raw subjectKeyId to form the key description
and only use the serial number if the subjectKeyId doesn't exist.

Reported-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-03 16:17:02 +01:00
Dmitry Kasatkin
40b50e80c5 KEYS: handle error code encoded in pointer
If hexlen is odd then function returns an error.
Use IS_ERR to check for error, otherwise invalid pointer
is used and kernel gives oops:

[  132.816522] BUG: unable to handle kernel paging request at
ffffffffffffffea
[  132.819902] IP: [<ffffffff812bfc20>] asymmetric_key_id_same+0x14/0x36
[  132.820302] PGD 1a12067 PUD 1a14067 PMD 0
[  132.820302] Oops: 0000 [#1] SMP
[  132.820302] Modules linked in: bridge(E) stp(E) llc(E) evdev(E)
serio_raw(E) i2c_piix4(E) button(E) fuse(E)
[  132.820302] CPU: 0 PID: 2993 Comm: cat Tainted: G            E
3.16.0-kds+ #2847
[  132.820302] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  132.820302] task: ffff88004249a430 ti: ffff880056640000 task.ti:
ffff880056640000
[  132.820302] RIP: 0010:[<ffffffff812bfc20>]  [<ffffffff812bfc20>]
asymmetric_key_id_same+0x14/0x36
[  132.820302] RSP: 0018:ffff880056643930  EFLAGS: 00010246
[  132.820302] RAX: 0000000000000000 RBX: ffffffffffffffea RCX:
ffff880056643ae0
[  132.820302] RDX: 000000000000005e RSI: ffffffffffffffea RDI:
ffff88005bac9300
[  132.820302] RBP: ffff880056643948 R08: 0000000000000003 R09:
00000007504aa01a
[  132.820302] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff88005d68ca40
[  132.820302] R13: 0000000000000101 R14: 0000000000000000 R15:
ffff88005bac5280
[  132.820302] FS:  00007f67a153c740(0000) GS:ffff88005da00000(0000)
knlGS:0000000000000000
[  132.820302] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[  132.820302] CR2: ffffffffffffffea CR3: 000000002e663000 CR4:
00000000000006f0
[  132.820302] Stack:
[  132.820302]  ffffffff812bfc66 ffff880056643ae0 ffff88005bac5280
ffff880056643958
[  132.820302]  ffffffff812bfc9d ffff880056643980 ffffffff812971d9
ffff88005ce930c1
[  132.820302]  ffff88005ce930c0 0000000000000000 ffff8800566439c8
ffffffff812fb753
[  132.820302] Call Trace:
[  132.820302]  [<ffffffff812bfc66>] ? asymmetric_match_key_ids+0x24/0x42
[  132.820302]  [<ffffffff812bfc9d>] asymmetric_key_cmp+0x19/0x1b
[  132.820302]  [<ffffffff812971d9>] keyring_search_iterator+0x74/0xd7
[  132.820302]  [<ffffffff812fb753>] assoc_array_subtree_iterate+0x67/0xd2
[  132.820302]  [<ffffffff81297165>] ? key_default_cmp+0x20/0x20
[  132.820302]  [<ffffffff812fbaa1>] assoc_array_iterate+0x19/0x1e
[  132.820302]  [<ffffffff81297332>] search_nested_keyrings+0xf6/0x2b6
[  132.820302]  [<ffffffff810728da>] ? sched_clock_cpu+0x91/0xa2
[  132.820302]  [<ffffffff810860d2>] ? mark_held_locks+0x58/0x6e
[  132.820302]  [<ffffffff810a137d>] ? current_kernel_time+0x77/0xb8
[  132.820302]  [<ffffffff81297871>] keyring_search_aux+0xe1/0x14c
[  132.820302]  [<ffffffff812977fc>] ? keyring_search_aux+0x6c/0x14c
[  132.820302]  [<ffffffff8129796b>] keyring_search+0x8f/0xb6
[  132.820302]  [<ffffffff812bfc84>] ? asymmetric_match_key_ids+0x42/0x42
[  132.820302]  [<ffffffff81297165>] ? key_default_cmp+0x20/0x20
[  132.820302]  [<ffffffff812ab9e3>] asymmetric_verify+0xa4/0x214
[  132.820302]  [<ffffffff812ab90e>] integrity_digsig_verify+0xb1/0xe2
[  132.820302]  [<ffffffff812abe41>] ? evm_verifyxattr+0x6a/0x7a
[  132.820302]  [<ffffffff812b0390>] ima_appraise_measurement+0x160/0x370
[  132.820302]  [<ffffffff81161db2>] ? d_absolute_path+0x5b/0x7a
[  132.820302]  [<ffffffff812ada30>] process_measurement+0x322/0x404

Reported-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: David Howells <dhowells@redhat.com>
2014-10-03 13:41:51 +01:00
James Morris
c867d07e3c Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity into next 2014-10-02 19:47:23 +10:00
James Morris
858f61c429 Merge branch 'next' of git://git.infradead.org/users/pcmoore/selinux into next 2014-10-01 00:45:26 +10:00
James Morris
6c8ff877cd Merge commit 'v3.16' into next 2014-10-01 00:44:04 +10:00
Richard Guy Briggs
4093a84439 selinux: normalize audit log formatting
Restructure to keyword=value pairs without spaces.  Drop superfluous words in
text.  Make invalid_context a keyword.  Change result= keyword to seresult=.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
[Minor rewrite to the patch subject line]
Signed-off-by: Paul Moore <pmoore@redhat.com>
2014-09-22 17:02:10 -04:00
Richard Guy Briggs
e173fb2646 selinux: cleanup error reporting in selinux_nlmsg_perm()
Convert audit_log() call to WARN_ONCE().

Rename "type=" to nlmsg_type=" to avoid confusion with the audit record
type.

Added "protocol=" to help track down which protocol (NETLINK_AUDIT?) was used
within the netlink protocol family.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
[Rewrote the patch subject line]
Signed-off-by: Paul Moore <pmoore@redhat.com>
2014-09-22 15:50:08 -04:00
James Morris
35e1efd25a Merge tag 'keys-next-20140922' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into next 2014-09-22 22:54:56 +10:00
David Howells
d1ac554045 KEYS: Check hex2bin()'s return when generating an asymmetric key ID
As it stands, the code to generate an asymmetric key ID prechecks the hex
string it is given whilst determining the length, before it allocates the
buffer for hex2bin() to translate into - which mean that checking the result of
hex2bin() is redundant.

Unfortunately, hex2bin() is marked as __must_check, which means that the
following warning may be generated if the return value isn't checked:

	crypto/asymmetric_keys/asymmetric_type.c: In function
	asymmetric_key_hex_to_key_id:
	crypto/asymmetric_keys/asymmetric_type.c:110: warning: ignoring return
	value of hex2bin, declared with attribute warn_unused_result

The warning can't be avoided by casting the result to void.

Instead, use strlen() to check the length of the string and ignore the fact
that the string might not be entirely valid hex until after the allocation has
been done - in which case we can use the result of hex2bin() for this.

Signed-off-by: David Howells <dhowells@redhat.com>
2014-09-22 00:02:01 +01:00
Roberto Sassu
1b68bdf9cd ima: detect violations for mmaped files
This patch fixes the detection of the 'open_writers' violation for mmaped
files.

before) an 'open_writers' violation is detected if the policy contains
        a rule with the criteria: func=FILE_CHECK mask=MAY_READ

after) an 'open_writers' violation is detected if the current event
       matches one of the policy rules.

With the old behaviour, the 'open_writers' violation is not detected
in the following case:

policy:
measure func=FILE_MMAP mask=MAY_EXEC

steps:
1) open a shared library for writing
2) execute a binary that links that shared library
3) during the binary execution, modify the shared library and save
   the change

result:
the 'open_writers' violation measurement is not present in the IMA list.

Only binaries executed are protected from writes. For libraries mapped
in memory there is the flag MAP_DENYWRITE for this purpose, but according
to the output of 'man mmap', the mmap flag is ignored.

Since ima_rdwr_violation_check() is now called by process_measurement()
the information about if the inode must be measured is already provided
by ima_get_action(). Thus the unnecessary function ima_must_measure()
has been removed.

Changes in v3 (Dmitry Kasatkin):
- Violation for MMAP_CHECK function are verified since this patch
- Changed patch description a bit

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-18 10:04:12 -04:00
Roberto Sassu
f7a859ff73 ima: fix race condition on ima_rdwr_violation_check and process_measurement
This patch fixes a race condition between two functions that try to access
the same inode. Since the i_mutex lock is held and released separately
in the two functions, there may be the possibility that a violation is
not correctly detected.

Suppose there are two processes, A (reader) and B (writer), if the
following sequence happens:

A: ima_rdwr_violation_check()
B: ima_rdwr_violation_check()
B: process_measurement()
B: starts writing the inode
A: process_measurement()

the ToMToU violation (a reader may be accessing a content different from
that measured, due to a concurrent modification by a writer) will not be
detected. To avoid this issue, the violation check and the measurement
must be done atomically.

This patch fixes the problem by moving the violation check inside
process_measurement() when the i_mutex lock is held. Differently from
the old code, the violation check is executed also for the MMAP_CHECK
hook (other than for FILE_CHECK). This allows to detect ToMToU violations
that are possible because shared libraries can be opened for writing
while they are in use (according to the output of 'man mmap', the mmap()
flag MAP_DENYWRITE is ignored).

Changes in v5 (Roberto Sassu):
* get iint if action is not zero
* exit process_measurement() after the violation check if action is zero
* reverse order process_measurement() exit cleanup (Mimi)

Changes in v4 (Dmitry Kasatkin):
* iint allocation is done before calling ima_rdrw_violation_check()
  (Suggested-by Mimi)
* do not check for violations if the policy does not contain 'measure'
  rules (done by Roberto Sassu)

Changes in v3 (Dmitry Kasatkin):
* no violation checking for MMAP_CHECK function in this patch
* remove use of filename from violation
* removes checking if ima is enabled from ima_rdrw_violation_check
* slight style change

Suggested-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-18 10:03:55 -04:00
James Morris
6f98e89288 Merge branch 'smack-for-3.18' of git://git.gitorious.org/smack-next/kernel into next 2014-09-18 23:52:46 +10:00
Roberto Sassu
a756024efe ima: added ima_policy_flag variable
This patch introduces the new variable 'ima_policy_flag', whose bits
are set depending on the action of the current policy rules. Only the
flags IMA_MEASURE, IMA_APPRAISE and IMA_AUDIT are set.

The new variable will be used to improve performance by skipping the
unnecessary execution of IMA code if the policy does not contain rules
with the above actions.

Changes in v6 (Roberto Sassu)
* do not check 'ima_initialized' before calling ima_update_policy_flag()
  in ima_update_policy() (suggested by Dmitry)
* calling ima_update_policy_flag() moved to init_ima to co-locate with
  ima_initialized (Dmitry)
* add/revise comments (Mimi)

Changes in v5 (Roberto Sassu)
* reset IMA_APPRAISE flag in 'ima_policy_flag' if 'ima_appraise' is set
  to zero (reported by Dmitry)
* update 'ima_policy_flag' only if IMA initialization is successful
  (suggested by Mimi and Dmitry)
* check 'ima_policy_flag' instead of 'ima_initialized'
  (suggested by Mimi and Dmitry)

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-17 16:39:36 -04:00
Roberto Sassu
be39ffc2fe ima: return an error code from ima_add_boot_aggregate()
This patch modifies ima_add_boot_aggregate() to return an error code.
This way we can determine if all the initialization procedures have
been executed successfully.

Signed-off-by: Roberto Sassu <roberto.sassu@polito.it>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-17 16:15:42 -04:00
Dmitry Kasatkin
2faa6ef3b2 ima: provide 'ima_appraise=log' kernel option
The kernel boot parameter "ima_appraise" currently defines 'off',
'enforce' and 'fix' modes.  When designing a policy and labeling
the system, access to files are either blocked in the default
'enforce' mode or automatically fixed in the 'fix' mode.  It is
beneficial to be able to run the system in a logging only mode,
without fixing it, in order to properly analyze the system. This
patch adds a 'log' mode to run the system in a permissive mode and
log the appraisal results.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-17 16:14:23 -04:00
Dmitry Kasatkin
31b70f6632 ima: move keyring initialization to ima_init()
ima_init() is used as a single place for all initializations.
Experimental keyring patches used the 'late_initcall' which was
co-located with the late_initcall(init_ima). When the late_initcall
for the keyring initialization was abandoned, initialization moved
to init_ima, though it would be more logical to move it to ima_init,
where the rest of the initialization is done. This patch moves the
keyring initialization to ima_init() as a preparatory step for
loading the keys which will be added to ima_init() in following
patches.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-17 16:10:59 -04:00
David Howells
d3e4f41973 PKCS#7 changes for next
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIVAwUAVBhnNxOxKuMESys7AQIlzA/6Ai9tUQQweoKvbVMyByF5AxsCvLeLZK+h
 uoi0vs5Lwq29Eb+ldvwgOlEveqy0+V3pdIiBbRflqLrPx08IP+0JbD6yn9rfXbmz
 eyCSb/DGBPoA6Mo2lvcLzvFyFbScCW2vQkX/el+1cOR4aYMryAWCHY8w+IkR2e27
 aKCSv5mpL2fA/zCGKZnsVRx0izukCPn7p6xvFQz5CQLh67zVNkFLsCzDdkmL4ml7
 FmZyrWFJhGtoEyyqO/oiz2La5iiMQjJQPdrgjq+E11BVxc4auPvpxrk/ZbJR/O4J
 KQ409l9EtbM4hS9CU2F3ZkAlhCDUJruS9vLD/FKiSUYkgHIHlUIk/38Ke+KPGFp0
 NpnCiYSU529PYvSoOuLNPxH6CvEF/PVsOuPr1ryiPpf7VdTJWvNYmJ999cdl4fIp
 GLIkoKchlCIf7SlonvFpevJf3v29bXfbiQEbxDEZgdtqkN9ZIA1W90CmnZyHvJUf
 5Acs1pDjZEpZIKrlDpi3N1usAX2vduDHxaGSY/FRevSshu9NELyo9dzwjGIenrAQ
 TU0q8NzVrikkJJjP0XUuJpDAz+gdwWfTc+Dxoi4KdgV0cazeRj79Hdl4a3i5jnp6
 8Ck351gh1Wfaz5IaFM0hT9V1XYTZ5kAE6WwTZy39/VtAPl3XiGK/ll1qRHRIvX0n
 tv8fhxJpfNo=
 =Pvcv
 -----END PGP SIGNATURE-----

Merge tag 'keys-pkcs7-20140916' into keys-next

Changes for next to improve the matching of asymmetric keys and to improve the
handling of PKCS#7 certificates:

 (1) Provide a method to preparse the data supplied for matching a key.  This
     permits they key type to extract out the bits it needs for matching once
     only.

     Further, the type of search (direct lookup or iterative) can be set and
     the function used to actually check the match can be set by preparse
     rather than being hard coded for the type.

 (2) Improves asymmetric keys identification.

     Keys derived from X.509 certs now get labelled with IDs derived from their
     issuer and certificate number (required to match PKCS#7) and from their
     SKID and subject (required to match X.509).

     IDs are now binary and match criterion preparsing is provided so that
     criteria can be turned into binary blobs to make matching faster.

 (3) Improves PKCS#7 message handling to permit PKCS#7 messages without X.509
     cert lists to be matched to trusted keys, thereby allowing minimally sized
     PKCS#7 certs to be used.

 (4) Improves PKCS#7 message handling to better handle certificate chains that
     are broken due to unsupported crypto that can otherwise by used to
     intersect a trust keyring.

These must go on top of the PKCS#7 parser cleanup fixes.

Signed-off-by: David Howells <dhowells@redhat.com>
2014-09-16 17:38:07 +01:00
David Howells
757932e6da PKCS#7: Handle PKCS#7 messages that contain no X.509 certs
The X.509 certificate list in a PKCS#7 message is optional.  To save space, we
can omit the inclusion of any X.509 certificates if we are sure that we can
look the relevant public key up by the serial number and issuer given in a
signed info block.

This also supports use of a signed info block for which we can't find a
matching X.509 cert in the certificate list, though it be populated.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:17 +01:00
David Howells
4155942000 PKCS#7: Better handling of unsupported crypto
Provide better handling of unsupported crypto when verifying a PKCS#7 message.
If we can't bridge the gap between a pair of X.509 certs or between a signed
info block and an X.509 cert because it involves some crypto we don't support,
that's not necessarily the end of the world as there may be other ways points
at which we can intersect with a ring of trusted keys.

Instead, only produce ENOPKG immediately if all the signed info blocks in a
PKCS#7 message require unsupported crypto to bridge to the first X.509 cert.
Otherwise, we defer the generation of ENOPKG until we get ENOKEY during trust
validation.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:15 +01:00
David Howells
46963b774d KEYS: Overhaul key identification when searching for asymmetric keys
Make use of the new match string preparsing to overhaul key identification
when searching for asymmetric keys.  The following changes are made:

 (1) Use the previously created asymmetric_key_id struct to hold the following
     key IDs derived from the X.509 certificate or PKCS#7 message:

	id: serial number + issuer
	skid: subjKeyId + subject
	authority: authKeyId + issuer

 (2) Replace the hex fingerprint attached to key->type_data[1] with an
     asymmetric_key_ids struct containing the id and the skid (if present).

 (3) Make the asymmetric_type match data preparse select one of two searches:

     (a) An iterative search for the key ID given if prefixed with "id:".  The
     	 prefix is expected to be followed by a hex string giving the ID to
     	 search for.  The criterion key ID is checked against all key IDs
     	 recorded on the key.

     (b) A direct search if the key ID is not prefixed with "id:".  This will
     	 look for an exact match on the key description.

 (4) Make x509_request_asymmetric_key() take a key ID.  This is then converted
     into "id:<hex>" and passed into keyring_search() where match preparsing
     will turn it back into a binary ID.

 (5) X.509 certificate verification then takes the authority key ID and looks
     up a key that matches it to find the public key for the certificate
     signature.

 (6) PKCS#7 certificate verification then takes the id key ID and looks up a
     key that matches it to find the public key for the signed information
     block signature.

Additional changes:

 (1) Multiple subjKeyId and authKeyId values on an X.509 certificate cause the
     cert to be rejected with -EBADMSG.

 (2) The 'fingerprint' ID is gone.  This was primarily intended to convey PGP
     public key fingerprints.  If PGP is supported in future, this should
     generate a key ID that carries the fingerprint.

 (3) Th ca_keyid= kernel command line option is now converted to a key ID and
     used to match the authority key ID.  Possibly this should only match the
     actual authKeyId part and not the issuer as well.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:13 +01:00
David Howells
7901c1a8ef KEYS: Implement binary asymmetric key ID handling
Implement the first step in using binary key IDs for asymmetric keys rather
than hex string keys.

The previously added match data preparsing will be able to convert hex
criterion strings into binary which can then be compared more rapidly.

Further, we actually want more then one ID string per public key.  The problem
is that X.509 certs refer to other X.509 certs by matching Issuer + AuthKeyId
to Subject + SubjKeyId, but PKCS#7 messages match against X.509 Issuer +
SerialNumber.

This patch just provides facilities for a later patch to make use of.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:11 +01:00
David Howells
f93b3cc7b1 KEYS: Update the keyrings documentation for match changes
Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:09 +01:00
David Howells
0c903ab64f KEYS: Make the key matching functions return bool
Make the key matching functions pointed to by key_match_data::cmp return bool
rather than int.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:08 +01:00
David Howells
c06cfb08b8 KEYS: Remove key_type::match in favour of overriding default by match_preparse
A previous patch added a ->match_preparse() method to the key type.  This is
allowed to override the function called by the iteration algorithm.
Therefore, we can just set a default that simply checks for an exact match of
the key description with the original criterion data and allow match_preparse
to override it as needed.

The key_type::match op is then redundant and can be removed, as can the
user_match() function.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:06 +01:00
David Howells
614d8c3901 KEYS: Remove key_type::def_lookup_type
Remove key_type::def_lookup_type as it's no longer used.  The information now
defaults to KEYRING_SEARCH_LOOKUP_DIRECT but may be overridden by
type->match_preparse().

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:04 +01:00
David Howells
462919591a KEYS: Preparse match data
Preparse the match data.  This provides several advantages:

 (1) The preparser can reject invalid criteria up front.

 (2) The preparser can convert the criteria to binary data if necessary (the
     asymmetric key type really wants to do binary comparison of the key IDs).

 (3) The preparser can set the type of search to be performed.  This means
     that it's not then a one-off setting in the key type.

 (4) The preparser can set an appropriate comparator function.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:02 +01:00
David Howells
53d91c5ce0 Provide a binary to hex conversion function
Provide a function to convert a buffer of binary data into an unterminated
ascii hex string representation of that data.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:36:01 +01:00
David Howells
1c9c115ccc Keyrings fixes for next
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIVAwUAVBhgQROxKuMESys7AQJv8w/+O61++U9OT5rL/X2pam3h4+tQmM7+2rU6
 rml9ZADkqKJVU1h3tT/WaFcmwR6J56buIWDZ7M7fPPRyvQPhfeBEHcakey+4iCd3
 SyFmP9ElkRvdOyoXRvImNIawsmnyme4CWSIQihSteyzyuV76odOI5HiJxMj6x8RV
 T4bjTsOMYugleWmuJzYPSniAs0my7Gxii7GK4WnLd+Jhxs8xJxiB3DNT4Kecxjuc
 MTldJIx32+Kj2JKp4ygbHM/WOI7jbdpseCedxbL4DNepgdXvVvV42pwPSCc2ydO/
 2b9kF+YnhsGbOv3Qd6GPPE5x0cMLKcmGf3DvJQcfCFSLjqpginGr0V/ylkVSf79S
 mQJLc2R7Z0ST7eFCyvClAeM9ZI6y+APWqo2wvVRNMww3NQhHyj43P2HPXiQEAryg
 UO6ZQehGHgxcx8uN/nB1gi4+S7+sZS6SzwvrTu04h5lYfCRrKSZGWDGpG/n7qtwo
 EKcWiAjupYbJtlDryL5Nz1xxkD6rpLKWbVfkO5FbJ8yAamz5XDl7FiQyJTu32LGj
 jbVma9sEIkJ5IB4mCAdF2tHi4o7QvQQbwWAPLu0B4hxp4JRslV5XhVVAH3CrvIFK
 l8A5nit0NwHms7d8+VLAyieknUForFHlmRheYXCSMvJDMfFToZrCNmTNHxZtyuuj
 voCrpkQYxGU=
 =9AZW
 -----END PGP SIGNATURE-----

Merge tag 'keys-next-fixes-20140916' into keys-next

Merge in keyrings fixes for next:

 (1) Insert some missing 'static' annotations.

Signed-off-by: David Howells <dhowells@redhat.com>
2014-09-16 17:32:55 +01:00
David Howells
68c45c7fea Keyrings fixes
-----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iQIVAwUAVBhlXROxKuMESys7AQIQghAAmxHRD9kD7AJrlcL187gTXl5dRyxQNhX0
 myT9A1/01jHJh6mPPKS5jt5ooenwfcbvBkdUARLNLq6j7urIzFk+UtSmfcN1OMXw
 3y15nuJKbSCZRzPMR94Z0Ik23YED9dmc4ubxW7E+psoWWIZUvFt4GaGw7ei77O39
 8Pbt/n7nIx2+s8aiXte2Om/zqzyMEmcLd3Mzlqxe4GX1jo/ThNQZ348EL+ECxJEl
 3OKe7i7oRfa48+SybmhW5Bx/2f/aQMcIQX04+akOFMIC505rUg6CTzphcrTyV5/s
 6FdQexRquf8/Ei/6DMAYPhnumRfWJ5x9txiNSEY4i11AIjo6Bt65vaLPuNniYRNI
 b6Wn8SSE8Ucrq5RrmNlSmoJCs7r1NE+JdOaEPO0MDVkOouaja8daISmveV2AfZfF
 bITOQgEw3QRpyL2FYdwa39/NXCONBILfL5HvNyXEfPEHBhI8igTgEyXYRwNHV9jT
 dsVFTc9ZIrjksLt3CDh4Z8xdyZbyojYdRCfH/wna9aAkZpwwGfSYCcR3dE6SK26y
 IjkqEVJoCFHEnvLUQkAQrc/2qWX2D1qHrcjVLwzwbM5G66YIPeLcJlZK2FbiY0Ay
 Yc/kUJY0hU5W+TfFb1hhjO5G2DTTw8Ou6MGcxSTE3HwzqICjDhE7BwFZdVikHRP0
 xMtjfJnMwuM=
 =v+dv
 -----END PGP SIGNATURE-----

Merge tag 'keys-fixes-20140916' into keys-next

Merge in keyrings fixes, at least some of which later patches depend on:

 (1) Reinstate the production of EPERM for key types beginning with '.' in
     requests from userspace.

 (2) Tidy up the cleanup of PKCS#7 message signed information blocks and fix a
     bug this made more obvious.

Signed-off-by: David Howells <dhowells@redhat.coM>
2014-09-16 17:32:16 +01:00
David Howells
cecf5d2e12 PKCS#7: Fix the parser cleanup to drain parsed out X.509 certs
Fix the parser cleanup code to drain parsed out X.509 certs in the case that
the decode fails and we jump to error_decode.

The function is rearranged so that the same cleanup code is used in the success
case as the error case - just that the message descriptor under construction is
only released if it is still pointed to by the context struct at that point.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:29:03 +01:00
David Howells
3cd0920cde PKCS#7: Provide a single place to do signed info block freeing
The code to free a signed info block is repeated several times, so move the
code to do it into a function of its own.  This gives us a place to add clean
ups for stuff that gets added to pkcs7_signed_info.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:29:03 +01:00
David Howells
54e2c2c1a9 KEYS: Reinstate EPERM for a key type name beginning with a '.'
Reinstate the generation of EPERM for a key type name beginning with a '.' in
a userspace call.  Types whose name begins with a '.' are internal only.

The test was removed by:

	commit a4e3b8d79a
	Author: Mimi Zohar <zohar@linux.vnet.ibm.com>
	Date:   Thu May 22 14:02:23 2014 -0400
	Subject: KEYS: special dot prefixed keyring name bug fix

I think we want to keep the restriction on type name so that userspace can't
add keys of a special internal type.

Note that removal of the test causes several of the tests in the keyutils
testsuite to fail.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-16 17:29:03 +01:00
David Howells
15155b9a45 PKCS#7: Add a missing static
Add a missing static (found by checker).

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:07:07 +01:00
David Howells
8da79b6439 KEYS: Fix missing statics
Fix missing statics (found by checker).

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Vivek Goyal <vgoyal@redhat.com>
2014-09-16 17:07:07 +01:00
James Morris
ac60ab4b49 Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity into next 2014-09-12 22:40:22 +10:00
Paul Moore
cbe0d6e879 selinux: make the netif cache namespace aware
While SELinux largely ignores namespaces, for good reason, there are
some places where it needs to at least be aware of namespaces in order
to function correctly.  Network namespaces are one example.  Basic
awareness of network namespaces are necessary in order to match a
network interface's index number to an actual network device.

This patch corrects a problem with network interfaces added to a
non-init namespace, and can be reproduced with the following commands:

 [NOTE: the NetLabel configuration is here only to active the dynamic
        networking controls ]

 # netlabelctl unlbl add default address:0.0.0.0/0 \
   label:system_u:object_r:unlabeled_t:s0
 # netlabelctl unlbl add default address:::/0 \
   label:system_u:object_r:unlabeled_t:s0
 # netlabelctl cipsov4 add pass doi:100 tags:1
 # netlabelctl map add domain:lspp_test_netlabel_t \
   protocol:cipsov4,100

 # ip link add type veth
 # ip netns add myns
 # ip link set veth1 netns myns
 # ip a add dev veth0 10.250.13.100/24
 # ip netns exec myns ip a add dev veth1 10.250.13.101/24
 # ip l set veth0 up
 # ip netns exec myns ip l set veth1 up

 # ping -c 1 10.250.13.101
 # ip netns exec myns ping -c 1 10.250.13.100

Reported-by: Jiri Jaburek <jjaburek@redhat.com>
Signed-off-by: Paul Moore <pmoore@redhat.com>
2014-09-10 17:09:57 -04:00
Dmitry Kasatkin
a2d61ed525 integrity: make integrity files as 'integrity' module
The kernel print macros use the KBUILD_MODNAME, which is initialized
to the module name. The current integrity/Makefile makes every file
as its own module, so pr_xxx messages are prefixed with the file name
instead of the module.  Similar to the evm/Makefile and ima/Makefile,
this patch fixes the integrity/Makefile to use the single name
'integrity'.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-09 10:28:58 -04:00
Dmitry Kasatkin
7ef84e65ec integrity: base integrity subsystem kconfig options on integrity
The integrity subsystem has lots of options and takes more than
half of the security menu.  This patch consolidates the options
under "integrity", which are hidden if not enabled.  This change
does not affect existing configurations.  Re-configuration is not
needed.

Changes v4:
- no need to change "integrity subsystem" to menuconfig as
options are hidden, when not enabled. (Mimi)
- add INTEGRITY Kconfig help description

Changes v3:
- dependency to INTEGRITY removed when behind 'if INTEGRITY'

Changes v2:
- previous patch moved integrity out of the 'security' menu.
  This version keeps integrity as a security option (Mimi).

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-09 10:28:56 -04:00
Dmitry Kasatkin
1ae8f41c23 integrity: move asymmetric keys config option
For better visual appearance it is better to co-locate
asymmetric key options together with signature support.

Signed-off-by: Dmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
2014-09-09 10:28:55 -04:00