| Commit message (Collapse) | Author | Age | Files | Lines |
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Move certificate handling out of the kernel/ directory and into a certs/
directory to get all the weird stuff in one place and move the generated
signing keys into this directory.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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into next
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The changes for mounting binary filesystems was allied
improperly, with the list of tokens being in an ifdef that
it shouldn't have been. Fix that, and a couple style issues
that were bothering me.
Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into next
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Fix the following warning:
scripts/sign-file.c: In function ‘main’:
scripts/sign-file.c:188: warning: value computed is not used
whereby the result of BIO_ctrl() is cast inside of BIO_reset() to an
integer of a different size - which we're not checking but probably should.
Reported-by: James Morris <jmorris@namei.org>
Signed-off-by: David Howells <dhowells@redhat.com>
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Add a MODULE_LICENSE() line to the PKCS#7 test key module to fix this
warning:
WARNING: modpost: missing MODULE_LICENSE() in
crypto/asymmetric_keys/pkcs7_test_key.o
Whilst we're at it, also add a module description.
Reported-by: James Morris <jmorris@namei.org>
Signed-off-by: David Howells <dhowells@redhat.com>
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The revised sign-file program is no longer a script that wraps the openssl
program, but now rather a program that makes use of OpenSSL's crypto
library. This means that to build the sign-file program, the kernel build
process now has a dependency on the OpenSSL development packages in
addition to OpenSSL itself.
Document this in Kconfig and in module-signing.txt.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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A PKCS#7 or CMS message can have per-signature authenticated attributes
that are digested as a lump and signed by the authorising key for that
signature. If such attributes exist, the content digest isn't itself
signed, but rather it is included in a special authattr which then
contributes to the signature.
Further, we already require the master message content type to be
pkcs7_signedData - but there's also a separate content type for the data
itself within the SignedData object and this must be repeated inside the
authattrs for each signer [RFC2315 9.2, RFC5652 11.1].
We should really validate the authattrs if they exist or forbid them
entirely as appropriate. To this end:
(1) Alter the PKCS#7 parser to reject any message that has more than one
signature where at least one signature has authattrs and at least one
that does not.
(2) Validate authattrs if they are present and strongly restrict them.
Only the following authattrs are permitted and all others are
rejected:
(a) contentType. This is checked to be an OID that matches the
content type in the SignedData object.
(b) messageDigest. This must match the crypto digest of the data.
(c) signingTime. If present, we check that this is a valid, parseable
UTCTime or GeneralTime and that the date it encodes fits within
the validity window of the matching X.509 cert.
(d) S/MIME capabilities. We don't check the contents.
(e) Authenticode SP Opus Info. We don't check the contents.
(f) Authenticode Statement Type. We don't check the contents.
The message is rejected if (a) or (b) are missing. If the message is
an Authenticode type, the message is rejected if (e) is missing; if
not Authenticode, the message is rejected if (d) - (f) are present.
The S/MIME capabilities authattr (d) unfortunately has to be allowed
to support kernels already signed by the pesign program. This only
affects kexec. sign-file suppresses them (CMS_NOSMIMECAP).
The message is also rejected if an authattr is given more than once or
if it contains more than one element in its set of values.
(3) Add a parameter to pkcs7_verify() to select one of the following
restrictions and pass in the appropriate option from the callers:
(*) VERIFYING_MODULE_SIGNATURE
This requires that the SignedData content type be pkcs7-data and
forbids authattrs. sign-file sets CMS_NOATTR. We could be more
flexible and permit authattrs optionally, but only permit minimal
content.
(*) VERIFYING_FIRMWARE_SIGNATURE
This requires that the SignedData content type be pkcs7-data and
requires authattrs. In future, this will require an attribute
holding the target firmware name in addition to the minimal set.
(*) VERIFYING_UNSPECIFIED_SIGNATURE
This requires that the SignedData content type be pkcs7-data but
allows either no authattrs or only permits the minimal set.
(*) VERIFYING_KEXEC_PE_SIGNATURE
This only supports the Authenticode SPC_INDIRECT_DATA content type
and requires at least an SpcSpOpusInfo authattr in addition to the
minimal set. It also permits an SPC_STATEMENT_TYPE authattr (and
an S/MIME capabilities authattr because the pesign program doesn't
remove these).
(*) VERIFYING_KEY_SIGNATURE
(*) VERIFYING_KEY_SELF_SIGNATURE
These are invalid in this context but are included for later use
when limiting the use of X.509 certs.
(4) The pkcs7_test key type is given a module parameter to select between
the above options for testing purposes. For example:
echo 1 >/sys/module/pkcs7_test_key/parameters/usage
keyctl padd pkcs7_test foo @s </tmp/stuff.pkcs7
will attempt to check the signature on stuff.pkcs7 as if it contains a
firmware blob (1 being VERIFYING_FIRMWARE_SIGNATURE).
Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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Add a name for PKEY_ID_PKCS7 into the pkey_id_type_name array.
Signed-off-by: David Howells <dhowells@redhat.com>
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Make the X.509 ASN.1 time object decoder fill in a time64_t rather than a
struct tm to make comparison easier (unfortunately, this makes readable
display less easy) and export it so that it can be used by the PKCS#7 code
too.
Further, tighten up its parsing to reject invalid dates (eg. weird
characters, non-existent hour numbers) and unsupported dates (eg. timezones
other than 'Z' or dates earlier than 1970).
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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Fix up the dependencies somewhat too, while we're at it.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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This is not required for the module signing key, although it doesn't do any
harm — it just means that any additional certs in the PEM file are also
trusted by the kernel.
But it does allow us to use the extract-cert tool for processing the extra
certs from CONFIG_SYSTEM_TRUSTED_KEYS, instead of that horrid awk|base64
hack.
Also cope with being invoked with no input file, creating an empty output
file as a result.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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Make sign-file use the OpenSSL CMS routines to generate a message to be
used as the signature blob instead of the PKCS#7 routines. This allows us
to change how the matching X.509 certificate is selected. With PKCS#7 the
only option is to match on the serial number and issuer fields of an X.509
certificate; with CMS, we also have the option of matching by subjectKeyId
extension. The new behaviour is selected with the "-k" flag.
Without the -k flag specified, the output is pretty much identical to the
PKCS#7 output.
Whilst we're at it, don't include the S/MIME capability list in the message
as it's irrelevant to us.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-By: David Woodhouse <David.Woodhouse@intel.com
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Since CMS is an evolution of PKCS#7, with much of the ASN.1 being
compatible, add support for CMS signed-data messages also [RFC5652 sec 5].
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-By: David Woodhouse <David.Woodhouse@intel.com>
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The key identifiers fabricated from an X.509 certificate are currently:
(A) Concatenation of serial number and issuer
(B) Concatenation of subject and subjectKeyID (SKID)
When verifying one X.509 certificate with another, the AKID in the target
can be used to match the authoritative certificate. The AKID can specify
the match in one or both of two ways:
(1) Compare authorityCertSerialNumber and authorityCertIssuer from the AKID
to identifier (A) above.
(2) Compare keyIdentifier from the AKID plus the issuer from the target
certificate to identifier (B) above.
When verifying a PKCS#7 message, the only available comparison is between
the IssuerAndSerialNumber field and identifier (A) above.
However, a subsequent patch adds CMS support. Whilst CMS still supports a
match on IssuerAndSerialNumber as for PKCS#7, it also supports an
alternative - which is the SubjectKeyIdentifier field. This is used to
match to an X.509 certificate on the SKID alone. No subject information is
available to be used.
To this end change the fabrication of (B) above to be from the X.509 SKID
alone. The AKID in keyIdentifier form then only matches on that and does
not include the issuer.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-By: David Woodhouse <David.Woodhouse@intel.com>
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We only support PKCS#7 signed-data [RFC2315 sec 9] content at the top level,
so reject anything else. Further, check that the version numbers in
SignedData and SignerInfo are 1 in both cases.
Note that we don't restrict the inner content type. In the PKCS#7 code we
don't parse the data attached there, but merely verify the signature over
it.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-By: David Woodhouse <David.Woodhouse@intel.com>
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Let the user explicitly provide a file containing trusted keys, instead of
just automatically finding files matching *.x509 in the build tree and
trusting whatever we find. This really ought to be an *explicit*
configuration, and the build rules for dealing with the files were
fairly painful too.
Fix applied from James Morris that removes an '=' from a macro definition
in kernel/Makefile as this is a feature that only exists from GNU make 3.82
onwards.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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The current rule for generating signing_key.priv and signing_key.x509 is
a classic example of a bad rule which has a tendency to break parallel
make. When invoked to create *either* target, it generates the other
target as a side-effect that make didn't predict.
So let's switch to using a single file signing_key.pem which contains
both key and certificate. That matches what we do in the case of an
external key specified by CONFIG_MODULE_SIG_KEY anyway, so it's also
slightly cleaner.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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Where an external PEM file or PKCS#11 URI is given, we can get the cert
from it for ourselves instead of making the user drop signing_key.x509
in place for us.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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This is only the key; the corresponding *cert* still needs to be in
$(topdir)/signing_key.x509. And there's no way to actually use this
from the build system yet.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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We don't want this in the Kconfig since it might then get exposed in
/proc/config.gz. So make it a parameter to Kbuild instead. This also
means we don't have to jump through hoops to strip quotes from it, as
we would if it was a config option.
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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Extract the function that drives the PKCS#7 signature verification given a
data blob and a PKCS#7 blob out from the module signing code and lump it with
the system keyring code as it's generic. This makes it independent of module
config options and opens it to use by the firmware loader.
Signed-off-by: David Howells <dhowells@redhat.com>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Kyle McMartin <kyle@kernel.org>
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system_keyring.c doesn't need to #include module-internal.h as it doesn't use
the one thing that exports. Remove the inclusion.
Signed-off-by: David Howells <dhowells@redhat.com>
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Make the -d option (which currently isn't actually wired to anything) write
out the PKCS#7 message as per the -p option and then exit without either
modifying the source or writing out a compound file of the source, signature
and metadata.
This will be useful when firmware signature support is added
upstream as firmware will be left intact, and we'll only require
the signature file. The descriptor is implicit by file extension
and the file's own size.
Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com>
Signed-off-by: David Howells <dhowells@redhat.com>
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Move to using PKCS#7 messages as module signatures because:
(1) We have to be able to support the use of X.509 certificates that don't
have a subjKeyId set. We're currently relying on this to look up the
X.509 certificate in the trusted keyring list.
(2) PKCS#7 message signed information blocks have a field that supplies the
data required to match with the X.509 certificate that signed it.
(3) The PKCS#7 certificate carries fields that specify the digest algorithm
used to generate the signature in a standardised way and the X.509
certificates specify the public key algorithm in a standardised way - so
we don't need our own methods of specifying these.
(4) We now have PKCS#7 message support in the kernel for signed kexec purposes
and we can make use of this.
To make this work, the old sign-file script has been replaced with a program
that needs compiling in a previous patch. The rules to build it are added
here.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
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Provide a utility that:
(1) Digests a module using the specified hash algorithm (typically sha256).
[The digest can be dumped into a file by passing the '-d' flag]
(2) Generates a PKCS#7 message that:
(a) Has detached data (ie. the module content).
(b) Is signed with the specified private key.
(c) Refers to the specified X.509 certificate.
(d) Has an empty X.509 certificate list.
[The PKCS#7 message can be dumped into a file by passing the '-p' flag]
(3) Generates a signed module by concatenating the old module, the PKCS#7
message, a descriptor and a magic string. The descriptor contains the
size of the PKCS#7 message and indicates the id_type as PKEY_ID_PKCS7.
(4) Either writes the signed module to the specified destination or renames
it over the source module.
This allows module signing to reuse the PKCS#7 handling code that was added
for PE file parsing for signed kexec.
Note that the utility is written in C and must be linked against the OpenSSL
crypto library.
Note further that I have temporarily dropped support for handling externally
created signatures until we can work out the best way to do those. Hopefully,
whoever creates the signature can give me a PKCS#7 certificate.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
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It is possible for a PKCS#7 message to have detached data. However, to verify
the signatures on a PKCS#7 message, we have to be able to digest the data.
Provide a function to supply that data. An error is given if the PKCS#7
message included embedded data.
This is used in a subsequent patch to supply the data to module signing where
the signature is in the form of a PKCS#7 message with detached data, whereby
the detached data is the module content that is signed.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
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If an X.509 certificate has an AuthorityKeyIdentifier extension that provides
an issuer and serialNumber, then make it so that these are used in preference
to the keyIdentifier field also held therein for searching for the signing
certificate.
If both the issuer+serialNumber and the keyIdentifier are supplied, then the
certificate is looked up by the former but the latter is checked as well. If
the latter doesn't match the subjectKeyIdentifier of the parent certificate,
EKEYREJECTED is returned.
This makes it possible to chain X.509 certificates based on the issuer and
serialNumber fields rather than on subjectKeyIdentifier. This is necessary as
we are having to deal with keys that are represented by X.509 certificates
that lack a subjectKeyIdentifier.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
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Extract both parts of the AuthorityKeyIdentifier, not just the keyIdentifier,
as the second part can be used to match X.509 certificates by issuer and
serialNumber.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Vivek Goyal <vgoyal@redhat.com>
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Copy string names to tokens in ASN.1 compiler rather than storing a pointer
into the source text. This means we don't have to use "%*.*s" all over the
place.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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Add an ASN.1 compiler option to dump the element tree to stdout.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-By: David Woodhouse <David.Woodhouse@intel.com>
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The keyrings mailing list has moved to keyrings@vger.kernel.org
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
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Adds an ignore case for kernel tasks,
so that they can access all resources.
Since kernel worker threads are spawned with
floor label, they are severely restricted by
Smack policy. It is not an issue without onlycap,
as these processes also run with root,
so CAP_MAC_OVERRIDE kicks in. But with onlycap
turned on, there is no way to change the label
for these processes.
Signed-off-by: Roman Kubiak <r.kubiak@samsung.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
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The kbuild test robot reported a couple of these,
and the third showed up by inspection. Making the
symbols static is proper.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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IPv6 appears to be (finally) coming of age with the
influx of autonomous devices. In support of this, add
the ability to associate a Smack label with IPv6 addresses.
This patch also cleans up some of the conditional
compilation associated with the introduction of
secmark processing. It's now more obvious which bit
of code goes with which feature.
Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
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security/smack/smackfs.c:2251:1-4: WARNING: end returns can be
simpified and declaration on line 2250 can be dropped
Simplify a trivial if-return sequence. Possibly combine with a
preceding function call.
Generated by: scripts/coccinelle/misc/simple_return.cocci
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
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Add support for setting smack mount labels(using smackfsdef, smackfsroot,
smackfshat, smackfsfloor, smackfstransmute) for filesystems with binary
mount data like NFS.
To achieve this, implement sb_parse_opts_str and sb_set_mnt_opts security
operations in smack LSM similar to SELinux.
Signed-off-by: Vivek Trivedi <t.vivek@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into next
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An ANY object in an ASN.1 grammar that is marked OPTIONAL should be skipped
if there is no more data to be had.
This can be tested by editing X.509 certificates or PKCS#7 messages to
remove the NULL from subobjects that look like the following:
SEQUENCE {
OBJECT(2a864886f70d01010b);
NULL();
}
This is an algorithm identifier plus an optional parameter.
The modified DER can be passed to one of:
keyctl padd asymmetric "" @s </tmp/modified.x509
keyctl padd pkcs7_test foo @s </tmp/modified.pkcs7
It should work okay with the patch and produce EBADMSG without.
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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If the ASN.1 decoder is asked to parse a sequence of objects, non-optional
matches get skipped if there's no more data to be had rather than a
data-overrun error being reported.
This is due to the code segment that decides whether to skip optional
matches (ie. matches that could get ignored because an element is marked
OPTIONAL in the grammar) due to a lack of data also skips non-optional
elements if the data pointer has reached the end of the buffer.
This can be tested with the data decoder for the new RSA akcipher algorithm
that takes three non-optional integers. Currently, it skips the last
integer if there is insufficient data.
Without the fix, #defining DEBUG in asn1_decoder.c will show something
like:
next_op: pc=0/13 dp=0/270 C=0 J=0
- match? 30 30 00
- TAG: 30 266 CONS
next_op: pc=2/13 dp=4/270 C=1 J=0
- match? 02 02 00
- TAG: 02 257
- LEAF: 257
next_op: pc=5/13 dp=265/270 C=1 J=0
- match? 02 02 00
- TAG: 02 3
- LEAF: 3
next_op: pc=8/13 dp=270/270 C=1 J=0
next_op: pc=11/13 dp=270/270 C=1 J=0
- end cons t=4 dp=270 l=270/270
The next_op line for pc=8/13 should be followed by a match line.
This is not exploitable for X.509 certificates by means of shortening the
message and fixing up the ASN.1 CONS tags because:
(1) The relevant records being built up are cleared before use.
(2) If the message is shortened sufficiently to remove the public key, the
ASN.1 parse of the RSA key will fail quickly due to a lack of data.
(3) Extracted signature data is either turned into MPIs (which cope with a
0 length) or is simpler integers specifying algoritms and suchlike
(which can validly be 0); and
(4) The AKID and SKID extensions are optional and their removal is handled
without risking passing a NULL to asymmetric_key_generate_id().
(5) If the certificate is truncated sufficiently to remove the subject,
issuer or serialNumber then the ASN.1 decoder will fail with a 'Cons
stack underflow' return.
This is not exploitable for PKCS#7 messages by means of removal of elements
from such a message from the tail end of a sequence:
(1) Any shortened X.509 certs embedded in the PKCS#7 message are survivable
as detailed above.
(2) The message digest content isn't used if it shows a NULL pointer,
similarly, the authattrs aren't used if that shows a NULL pointer.
(3) A missing signature results in a NULL MPI - which the MPI routines deal
with.
(4) If data is NULL, it is expected that the message has detached content and
that is handled appropriately.
(5) If the serialNumber is excised, the unconditional action associated
with it will pick up the containing SEQUENCE instead, so no NULL
pointer will be seen here.
If both the issuer and the serialNumber are excised, the ASN.1 decode
will fail with an 'Unexpected tag' return.
In either case, there's no way to get to asymmetric_key_generate_id()
with a NULL pointer.
(6) Other fields are decoded to simple integers. Shortening the message
to omit an algorithm ID field will cause checks on this to fail early
in the verification process.
This can also be tested by snipping objects off of the end of the ASN.1 stream
such that mandatory tags are removed - or even from the end of internal
SEQUENCEs. If any mandatory tag is missing, the error EBADMSG *should* be
produced. Without this patch ERANGE or ENOPKG might be produced or the parse
may apparently succeed, perhaps with ENOKEY or EKEYREJECTED being produced
later, depending on what gets snipped.
Just snipping off the final BIT_STRING or OCTET_STRING from either sample
should be a start since both are mandatory and neither will cause an EBADMSG
without the patches
Reported-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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In an ASN.1 description where there is a CHOICE construct that contains
elements with IMPLICIT tags that refer to constructed types, actions to be
taken on those elements should be conditional on the corresponding element
actually being matched. Currently, however, such actions are performed
unconditionally in the middle of processing the CHOICE.
For example, look at elements 'b' and 'e' here:
A ::= SEQUENCE {
CHOICE {
b [0] IMPLICIT B ({ do_XXXXXXXXXXXX_b }),
c [1] EXPLICIT C ({ do_XXXXXXXXXXXX_c }),
d [2] EXPLICIT B ({ do_XXXXXXXXXXXX_d }),
e [3] IMPLICIT C ({ do_XXXXXXXXXXXX_e }),
f [4] IMPLICIT INTEGER ({ do_XXXXXXXXXXXX_f })
}
} ({ do_XXXXXXXXXXXX_A })
B ::= SET OF OBJECT IDENTIFIER ({ do_XXXXXXXXXXXX_oid })
C ::= SET OF INTEGER ({ do_XXXXXXXXXXXX_int })
They each have an action (do_XXXXXXXXXXXX_b and do_XXXXXXXXXXXX_e) that
should only be processed if that element is matched.
The problem is that there's no easy place to hang the action off in the
subclause (type B for element 'b' and type C for element 'e') because
subclause opcode sequences can be shared.
To fix this, introduce a conditional action opcode(ASN1_OP_MAYBE_ACT) that
the decoder only processes if the preceding match was successful. This can
be seen in an excerpt from the output of the fixed ASN.1 compiler for the
above ASN.1 description:
[ 13] = ASN1_OP_COND_MATCH_JUMP_OR_SKIP, // e
[ 14] = _tagn(CONT, CONS, 3),
[ 15] = _jump_target(45), // --> C
[ 16] = ASN1_OP_MAYBE_ACT,
[ 17] = _action(ACT_do_XXXXXXXXXXXX_e),
In this, if the op at [13] is matched (ie. element 'e' above) then the
action at [16] will be performed. However, if the op at [13] doesn't match
or is skipped because it is conditional and some previous op matched, then
the action at [16] will be ignored.
Note that to make this work in the decoder, the ASN1_OP_RETURN op must set
the flag to indicate that a match happened. This is necessary because the
_jump_target() seen above introduces a subclause (in this case an object of
type 'C') which is likely to alter the flag. Setting the flag here is okay
because to process a subclause, a match must have happened and caused a
jump.
This cannot be tested with the code as it stands, but rather affects future
code.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: David Woodhouse <David.Woodhouse@intel.com>
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Fix the handling of CHOICE types in the ASN.1 compiler to make SEQUENCE and
SET elements in a CHOICE be correctly rendered as skippable and conditional
as appropriate.
For example, in the following ASN.1:
Foo ::= SEQUENCE { w1 INTEGER, w2 Bar, w3 OBJECT IDENTIFIER }
Bar ::= CHOICE {
x1 Seq1,
x2 [0] IMPLICIT OCTET STRING,
x3 Seq2,
x4 SET OF INTEGER
}
Seq1 ::= SEQUENCE { y1 INTEGER, y2 INTEGER, y3 INTEGER }
Seq2 ::= SEQUENCE { z1 BOOLEAN, z2 BOOLEAN, z3 BOOLEAN }
the output in foo.c generated by:
./scripts/asn1_compiler foo.asn1 foo.c foo.h
included:
// Bar
// Seq1
[ 4] = ASN1_OP_MATCH,
[ 5] = _tag(UNIV, CONS, SEQ),
...
[ 13] = ASN1_OP_COND_MATCH_OR_SKIP, // x2
[ 14] = _tagn(CONT, PRIM, 0),
// Seq2
[ 15] = ASN1_OP_MATCH,
[ 16] = _tag(UNIV, CONS, SEQ),
...
[ 24] = ASN1_OP_COND_MATCH_JUMP_OR_SKIP, // x4
[ 25] = _tag(UNIV, CONS, SET),
...
[ 27] = ASN1_OP_COND_FAIL,
as a result of the CHOICE - but this is wrong on lines 4 and 15 because
both of these should be skippable (one and only one of the four can be
picked) and the one on line 15 should also be conditional so that it is
ignored if anything before it matches.
After the patch, it looks like:
// Bar
// Seq1
[ 4] = ASN1_OP_MATCH_JUMP_OR_SKIP, // x1
[ 5] = _tag(UNIV, CONS, SEQ),
...
[ 7] = ASN1_OP_COND_MATCH_OR_SKIP, // x2
[ 8] = _tagn(CONT, PRIM, 0),
// Seq2
[ 9] = ASN1_OP_COND_MATCH_JUMP_OR_SKIP, // x3
[ 10] = _tag(UNIV, CONS, SEQ),
...
[ 12] = ASN1_OP_COND_MATCH_JUMP_OR_SKIP, // x4
[ 13] = _tag(UNIV, CONS, SET),
...
[ 15] = ASN1_OP_COND_FAIL,
where all four options are skippable and the second, third and fourth are
all conditional, as is the backstop at the end.
This hasn't been a problem so far because in the ASN.1 specs we have are
either using primitives or are using SET OF and SEQUENCE OF which are
handled correctly.
Whilst we're at it, also make sure that element labels get included in
comments in the output for elements that have complex types.
This cannot be tested with the code as it stands, but rather affects future
code.
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-By: David Woodhouse <David.Woodhouse@intel.com>
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Now that minor LSMs can cleanly stack with major LSMs, remove the unneeded
config for Yama to be made to explicitly stack. Just selecting the main
Yama CONFIG will allow it to work, regardless of the major LSM. Since
distros using Yama are already forcing it to stack, this is effectively
a no-op change.
Additionally add MAINTAINERS entry.
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.l.morris@oracle.com>
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git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux into next
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For clarity, if CONFIG_SECCOMP isn't defined, seccomp_mode() is returning
"disabled". This makes that more clear, along with another 0-use, and
results in no operational change.
Signed-off-by: Kees Cook <keescook@chromium.org>
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This patch is the first step in enabling checkpoint/restore of processes
with seccomp enabled.
One of the things CRIU does while dumping tasks is inject code into them
via ptrace to collect information that is only available to the process
itself. However, if we are in a seccomp mode where these processes are
prohibited from making these syscalls, then what CRIU does kills the task.
This patch adds a new ptrace option, PTRACE_O_SUSPEND_SECCOMP, that enables
a task from the init user namespace which has CAP_SYS_ADMIN and no seccomp
filters to disable (and re-enable) seccomp filters for another task so that
they can be successfully dumped (and restored). We restrict the set of
processes that can disable seccomp through ptrace because although today
ptrace can be used to bypass seccomp, there is some discussion of closing
this loophole in the future and we would like this patch to not depend on
that behavior and be future proofed for when it is removed.
Note that seccomp can be suspended before any filters are actually
installed; this behavior is useful on criu restore, so that we can suspend
seccomp, restore the filters, unmap our restore code from the restored
process' address space, and then resume the task by detaching and have the
filters resumed as well.
v2 changes:
* require that the tracer have no seccomp filters installed
* drop TIF_NOTSC manipulation from the patch
* change from ptrace command to a ptrace option and use this ptrace option
as the flag to check. This means that as soon as the tracer
detaches/dies, seccomp is re-enabled and as a corrollary that one can not
disable seccomp across PTRACE_ATTACHs.
v3 changes:
* get rid of various #ifdefs everywhere
* report more sensible errors when PTRACE_O_SUSPEND_SECCOMP is incorrectly
used
v4 changes:
* get rid of may_suspend_seccomp() in favor of a capable() check in ptrace
directly
v5 changes:
* check that seccomp is not enabled (or suspended) on the tracer
Signed-off-by: Tycho Andersen <tycho.andersen@canonical.com>
CC: Will Drewry <wad@chromium.org>
CC: Roland McGrath <roland@hack.frob.com>
CC: Pavel Emelyanov <xemul@parallels.com>
CC: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Acked-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
[kees: access seccomp.mode through seccomp_mode() instead]
Signed-off-by: Kees Cook <keescook@chromium.org>
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Recently lockless_dereference() was added which can be used in place of
hard-coding smp_read_barrier_depends(). The following PATCH makes the change.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
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