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SHA1 is reasonable in HMAC constructs, but it's desirable to be able to
use stronger hashes in digital signatures. Modify the EVM crypto code so
the hash type is imported from the digital signature and passed down to
the hash calculation code, and return the digest size to higher layers
for validation.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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When EVM attempts to appraise a file signed with a crypto algorithm the
kernel doesn't have support for, it will cause the kernel to trigger a
module load. If the EVM policy includes appraisal of kernel modules this
will in turn call back into EVM - since EVM is holding a lock until the
crypto initialisation is complete, this triggers a deadlock. Add a
CRYPTO_NOLOAD flag and skip module loading if it's set, and add that flag
in the EVM case in order to fail gracefully with an error message
instead of deadlocking.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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When CONFIG_SECURITYFS is not enabled, securityfs_create_dir returns
-ENODEV which throws the following error:
"Unable to create integrity sysfs dir: -19"
However, if the feature is disabled, it can't be warning and hence
we need to silence the error. This patch checks for the error -ENODEV
which is returned when CONFIG_SECURITYFS is disabled to stop the error
being thrown.
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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The AUDIT_INTEGRITY_RULE is used for auditing IMA policy rules and
the IMA "audit" policy action. This patch defines
AUDIT_INTEGRITY_POLICY_RULE to reflect the IMA policy rules.
Since we defined a new message type we can now also pass the
audit_context and get an associated SYSCALL record. This now produces
the following records when parsing IMA policy's rules:
type=UNKNOWN[1807] msg=audit(1527888965.738:320): action=audit \
func=MMAP_CHECK mask=MAY_EXEC res=1
type=UNKNOWN[1807] msg=audit(1527888965.738:320): action=audit \
func=FILE_CHECK mask=MAY_READ res=1
type=SYSCALL msg=audit(1527888965.738:320): arch=c000003e syscall=1 \
success=yes exit=17 a0=1 a1=55bcfcca9030 a2=11 a3=7fcc1b55fb38 \
items=0 ppid=1567 pid=1601 auid=0 uid=0 gid=0 euid=0 suid=0 \
fsuid=0 egid=0 sgid=0 fsgid=0 tty=tty2 ses=2 comm="echo" \
exe="/usr/bin/echo" \
subj=unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023 key=(null)
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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If Integrity is not auditing, IMA shouldn't audit, either.
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Remove the usage of audit_log_string() and replace it with
audit_log_format().
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Suggested-by: Steve Grubb <sgrubb@redhat.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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The parameters passed to this logging function are all provided by
a privileged user and therefore we can call audit_log_string()
rather than audit_log_untrustedstring().
Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
Suggested-by: Steve Grubb <sgrubb@redhat.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Some systems are memory constrained but they need to load very large
firmwares. The firmware subsystem allows drivers to request this
firmware be loaded from the filesystem, but this requires that the
entire firmware be loaded into kernel memory first before it's provided
to the driver. This can lead to a situation where we map the firmware
twice, once to load the firmware into kernel memory and once to copy the
firmware into the final resting place.
To resolve this problem, commit a098ecd2fa7d ("firmware: support loading
into a pre-allocated buffer") introduced request_firmware_into_buf() API
that allows drivers to request firmware be loaded directly into a
pre-allocated buffer.
Do devices using pre-allocated memory run the risk of the firmware being
accessible to the device prior to the completion of IMA's signature
verification any more than when using two buffers? (Refer to mailing list
discussion[1]).
Only on systems with an IOMMU can the access be prevented. As long as
the signature verification completes prior to the DMA map is performed,
the device can not access the buffer. This implies that the same buffer
can not be re-used. Can we ensure the buffer has not been DMA mapped
before using the pre-allocated buffer?
[1] https://lkml.org/lkml/2018/7/10/56
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
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Both the init_module and finit_module syscalls call either directly
or indirectly the security_kernel_read_file LSM hook. This patch
replaces the direct call in init_module with a call to the new
security_kernel_load_data hook and makes the corresponding changes
in SELinux, LoadPin, and IMA.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Jeff Vander Stoep <jeffv@google.com>
Cc: Casey Schaufler <casey@schaufler-ca.com>
Cc: Kees Cook <keescook@chromium.org>
Acked-by: Jessica Yu <jeyu@kernel.org>
Acked-by: Paul Moore <paul@paul-moore.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
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IMA by default does not measure, appraise or audit files, but can be
enabled at runtime by specifying a builtin policy on the boot command line
or by loading a custom policy.
This patch defines a build time policy, which verifies kernel modules,
firmware, kexec image, and/or the IMA policy signatures. This build time
policy is automatically enabled at runtime and persists after loading a
custom policy.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
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With an IMA policy requiring signed firmware, this patch prevents
the sysfs fallback method of loading firmware.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Matthew Garrett <mjg59@google.com>
Signed-off-by: James Morris <james.morris@microsoft.com>
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The original kexec_load syscall can not verify file signatures, nor can
the kexec image be measured. Based on policy, deny the kexec_load
syscall.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Kees Cook <keescook@chromium.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: James Morris <james.morris@microsoft.com>
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just check ->f_mode in ima_appraise_measurement()
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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Pull integrity updates from James Morris:
"From Mimi:
- add run time support for specifying additional security xattrs
included in the security.evm HMAC/signature
- some code clean up and bug fixes"
* 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
EVM: unlock on error path in evm_read_xattrs()
EVM: prevent array underflow in evm_write_xattrs()
EVM: Fix null dereference on xattr when xattr fails to allocate
EVM: fix memory leak of temporary buffer 'temp'
IMA: use list_splice_tail_init_rcu() instead of its open coded variant
ima: use match_string() helper
ima: fix updating the ima_appraise flag
ima: based on policy verify firmware signatures (pre-allocated buffer)
ima: define a new policy condition based on the filesystem name
EVM: Allow runtime modification of the set of verified xattrs
EVM: turn evm_config_xattrnames into a list
integrity: Add an integrity directory in securityfs
ima: Remove unused variable ima_initialized
ima: Unify logging
ima: Reflect correct permissions for policy
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Pull audit updates from Paul Moore:
"Another reasonable chunk of audit changes for v4.18, thirteen patches
in total.
The thirteen patches can mostly be broken down into one of four
categories: general bug fixes, accessor functions for audit state
stored in the task_struct, negative filter matches on executable
names, and extending the (relatively) new seccomp logging knobs to the
audit subsystem.
The main driver for the accessor functions from Richard are the
changes we're working on to associate audit events with containers,
but I think they have some standalone value too so I figured it would
be good to get them in now.
The seccomp/audit patches from Tyler apply the seccomp logging
improvements from a few releases ago to audit's seccomp logging;
starting with this patchset the changes in
/proc/sys/kernel/seccomp/actions_logged should apply to both the
standard kernel logging and audit.
As usual, everything passes the audit-testsuite and it happens to
merge cleanly with your tree"
[ Heh, except it had trivial merge conflicts with the SELinux tree that
also came in from Paul - Linus ]
* tag 'audit-pr-20180605' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit:
audit: Fix wrong task in comparison of session ID
audit: use existing session info function
audit: normalize loginuid read access
audit: use new audit_context access funciton for seccomp_actions_logged
audit: use inline function to set audit context
audit: use inline function to get audit context
audit: convert sessionid unset to a macro
seccomp: Don't special case audited processes when logging
seccomp: Audit attempts to modify the actions_logged sysctl
seccomp: Configurable separator for the actions_logged string
seccomp: Separate read and write code for actions_logged sysctl
audit: allow not equal op for audit by executable
audit: add syscall information to FEATURE_CHANGE records
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We need to unlock before returning on this error path.
Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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If the user sets xattr->name[0] to NUL then we would read one character
before the start of the array. This bug seems harmless as far as I can
see but perhaps it would trigger a warning in KASAN.
Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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In the case where the allocation of xattr fails and xattr is NULL, the
error exit return path via label 'out' will dereference xattr when
kfree'ing xattr-name. Fix this by only kfree'ing xattr->name and xattr
when xattr is non-null.
Detected by CoverityScan, CID#1469366 ("Dereference after null check")
Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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The allocation of 'temp' is not kfree'd and hence there is a memory
leak on each call of evm_read_xattrs. Fix this by kfree'ing it
after copying data from it back to the user space buffer 'buf'.
Detected by CoverityScan, CID#1469386 ("Resource Leak")
Fixes: fa516b66a1bf ("EVM: Allow runtime modification of the set of verified xattrs")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Use list_splice_tail_init_rcu() to extend the existing custom IMA policy
with additional IMA policy rules.
Signed-off-by: Petko Manolov <petko.manolov@konsulko.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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match_string() returns the index of an array for a matching string,
which can be used intead of open coded variant.
Signed-off-by: Yisheng Xie <xieyisheng1@huawei.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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As IMA policy rules are added, a mask of the type of rule (eg. kernel
modules, firmware, IMA policy) is updated. Unlike custom IMA policy
rules, which replace the original builtin policy rules and update the
mask, the builtin "secure_boot" policy rules were loaded, but did not
update the mask.
This patch refactors the code to load custom policies, defining a new
function named ima_appraise_flag(). The new function is called either
when loading the builtin "secure_boot" or custom policies.
Fixes: 503ceaef8e2e ("ima: define a set of appraisal rules requiring file signatures")
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Don't differentiate, for now, between kernel_read_file_id READING_FIRMWARE
and READING_FIRMWARE_PREALLOC_BUFFER enumerations.
Fixes: a098ecd firmware: support loading into a pre-allocated buffer (since 4.8)
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Serge E. Hallyn <serge@hallyn.com>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
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If/when file data signatures are distributed with the file data, this
patch will not be needed. In the current environment where only some
files are signed, the ability to differentiate between file systems is
needed. Some file systems consider the file system magic number
internal to the file system.
This patch defines a new IMA policy condition named "fsname", based on
the superblock's file_system_type (sb->s_type) name. This allows policy
rules to be expressed in terms of the filesystem name.
The following sample rules require file signatures on rootfs files
executed or mmap'ed.
appraise func=BPRM_CHECK fsname=rootfs appraise_type=imasig
appraise func=FILE_MMAP fsname=rootfs appraise_type=imasig
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Theodore Ts'o <tytso@mit.edu>
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Sites may wish to provide additional metadata alongside files in order
to make more fine-grained security decisions[1]. The security of this is
enhanced if this metadata is protected, something that EVM makes
possible. However, the kernel cannot know about the set of extended
attributes that local admins may wish to protect, and hardcoding this
policy in the kernel makes it difficult to change over time and less
convenient for distributions to enable.
This patch adds a new /sys/kernel/security/integrity/evm/evm_xattrs node,
which can be read to obtain the current set of EVM-protected extended
attributes or written to in order to add new entries. Extending this list
will not change the validity of any existing signatures provided that the
file in question does not have any of the additional extended attributes -
missing xattrs are skipped when calculating the EVM hash.
[1] For instance, a package manager could install information about the
package uploader in an additional extended attribute. Local LSM policy
could then be associated with that extended attribute in order to
restrict the privileges available to packages from less trusted
uploaders.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Use a list of xattrs rather than an array - this makes it easier to
extend the list at runtime.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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We want to add additional evm control nodes, and it'd be preferable not
to clutter up the securityfs root directory any further. Create a new
integrity directory, move the ima directory into it, create an evm
directory for the evm attribute and add compatibility symlinks.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Commit a756024 ("ima: added ima_policy_flag variable") replaced
ima_initialized with ima_policy_flag, but didn't remove ima_initialized.
This patch removes it.
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: James Morris <james.morris@microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Define pr_fmt everywhere.
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> (powerpc build error)
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Changelog:
Previous pr_fmt definition was too late and caused problems in powerpc
allyesconfg build.
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Kernel configured as CONFIG_IMA_READ_POLICY=y && CONFIG_IMA_WRITE_POLICY=n
keeps 0600 mode after loading policy. Remove write permission to state
that policy file no longer be written.
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Recognizing that the audit context is an internal audit value, use an
access function to retrieve the audit context pointer for the task
rather than reaching directly into the task struct to get it.
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
[PM: merge fuzz in auditsc.c and selinuxfs.c, checkpatch.pl fixes]
Signed-off-by: Paul Moore <paul@paul-moore.com>
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The kernel should not calculate new hmacs for mounts done by
non-root users. Update evm_calc_hmac_or_hash() to refuse to
calculate new hmacs for mounts for non-init user namespaces.
Cc: linux-integrity@vger.kernel.org
Cc: linux-security-module@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: James Morris <james.l.morris@oracle.com>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: Dongsu Park <dongsu@kinvolk.io>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
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IMA requires having it's hash algorithm be compiled-in due to it's
early use. The default IMA algorithm is protected by Kconfig to be
compiled-in.
The ima_hash kernel parameter allows to choose the hash algorithm. When
the specified algorithm is not available or available as a module, IMA
initialization fails, which leads to a kernel panic (mknodat syscall calls
ima_post_path_mknod()). Therefore as fallback we force IMA to use
the default builtin Kconfig hash algorithm.
Fixed crash:
$ grep CONFIG_CRYPTO_MD4 .config
CONFIG_CRYPTO_MD4=m
[ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-4.12.14-2.3-default root=UUID=74ae8202-9ca7-4e39-813b-22287ec52f7a video=1024x768-16 plymouth.ignore-serial-consoles console=ttyS0 console=tty resume=/dev/disk/by-path/pci-0000:00:07.0-part3 splash=silent showopts ima_hash=md4
...
[ 1.545190] ima: Can not allocate md4 (reason: -2)
...
[ 2.610120] BUG: unable to handle kernel NULL pointer dereference at (null)
[ 2.611903] IP: ima_match_policy+0x23/0x390
[ 2.612967] PGD 0 P4D 0
[ 2.613080] Oops: 0000 [#1] SMP
[ 2.613080] Modules linked in: autofs4
[ 2.613080] Supported: Yes
[ 2.613080] CPU: 0 PID: 1 Comm: systemd Not tainted 4.12.14-2.3-default #1
[ 2.613080] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.0.0-prebuilt.qemu-project.org 04/01/2014
[ 2.613080] task: ffff88003e2d0040 task.stack: ffffc90000190000
[ 2.613080] RIP: 0010:ima_match_policy+0x23/0x390
[ 2.613080] RSP: 0018:ffffc90000193e88 EFLAGS: 00010296
[ 2.613080] RAX: 0000000000000000 RBX: 000000000000000c RCX: 0000000000000004
[ 2.613080] RDX: 0000000000000010 RSI: 0000000000000001 RDI: ffff880037071728
[ 2.613080] RBP: 0000000000008000 R08: 0000000000000000 R09: 0000000000000000
[ 2.613080] R10: 0000000000000008 R11: 61c8864680b583eb R12: 00005580ff10086f
[ 2.613080] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000008000
[ 2.613080] FS: 00007f5c1da08940(0000) GS:ffff88003fc00000(0000) knlGS:0000000000000000
[ 2.613080] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2.613080] CR2: 0000000000000000 CR3: 0000000037002000 CR4: 00000000003406f0
[ 2.613080] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 2.613080] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 2.613080] Call Trace:
[ 2.613080] ? shmem_mknod+0xbf/0xd0
[ 2.613080] ima_post_path_mknod+0x1c/0x40
[ 2.613080] SyS_mknod+0x210/0x220
[ 2.613080] entry_SYSCALL_64_fastpath+0x1a/0xa5
[ 2.613080] RIP: 0033:0x7f5c1bfde570
[ 2.613080] RSP: 002b:00007ffde1c90dc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
[ 2.613080] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f5c1bfde570
[ 2.613080] RDX: 0000000000000000 RSI: 0000000000008000 RDI: 00005580ff10086f
[ 2.613080] RBP: 00007ffde1c91040 R08: 00005580ff10086f R09: 0000000000000000
[ 2.613080] R10: 0000000000104000 R11: 0000000000000246 R12: 00005580ffb99660
[ 2.613080] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000002
[ 2.613080] Code: 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 57 41 56 44 8d 14 09 41 55 41 54 55 53 44 89 d3 09 cb 48 83 ec 38 48 8b 05 c5 03 29 01 <4c> 8b 20 4c 39 e0 0f 84 d7 01 00 00 4c 89 44 24 08 89 54 24 20
[ 2.613080] RIP: ima_match_policy+0x23/0x390 RSP: ffffc90000193e88
[ 2.613080] CR2: 0000000000000000
[ 2.613080] ---[ end trace 9a9f0a8a73079f6a ]---
[ 2.673052] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
[ 2.673052]
[ 2.675337] Kernel Offset: disabled
[ 2.676405] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000009
Signed-off-by: Petr Vorel <pvorel@suse.cz>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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This is required to use SMACK and IMA/EVM together. Add it to the
default nomeasure/noappraise list like other pseudo filesystems.
Signed-off-by: Martin Townsend <mtownsend1973@gmail.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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EVM might update the evm xattr while the VFS performs a remount to
readonly mode. This is not properly checked for, additionally check
the s_readonly_remount superblock flag before writing.
The bug can for example be observed with UBIFS. UBIFS checks the free
space on the device before and after a remount. With EVM enabled the
free space sometimes differs between both checks.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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Replace nested ifs in the EVM xattr verification logic with a switch
statement, making the code easier to understand.
Also, add comments to the if statements in the out section and constify the
cause variable.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
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The "goto out" statement doesn't have any purpose since there's no cleanup
to be done when returning early, so remove it. This also makes the rc
variable unnecessary so remove it as well.
Also, the xattr_len and fmt variables are redundant so remove them as well.
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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This macro isn't used anymore since commit 0d73a55208e9 ("ima: re-introduce
own integrity cache lock"), so remove it.
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Acked-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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In keeping with the directive to get rid of VLAs [1], let's drop the VLA
from ima_audit_measurement(). We need to adjust the return type of
ima_audit_measurement, because now this function can fail if an allocation
fails.
[1]: https://lkml.org/lkml/2018/3/7/621
v2: just use audit_log_format instead of doing a second allocation
v3: ignore failures in ima_audit_measurement()
Signed-off-by: Tycho Andersen <tycho@tycho.ws>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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TPM_CRB driver provides TPM CRB 2.0 support. If it is built as a
module, the TPM chip is registered after IMA init. tpm_pcr_read() in
IMA fails and displays the following message even though eventually
there is a TPM chip on the system.
ima: No TPM chip found, activating TPM-bypass! (rc=-19)
Fix IMA Kconfig to select TPM_CRB so TPM_CRB driver is built in the kernel
and initializes before IMA.
Signed-off-by: Jiandi An <anjiandi@codeaurora.org>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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There is no gain from doing this except for some self-documenting.
Signed-off-by: Hernán Gonzalez <hernan@vanguardiasur.com.ar>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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These variables are not used where they are was defined. There is no
point in declaring them there as extern. Move and constify them, saving
2 bytes.
Function old new delta
init_desc 273 271 -2
Total: Before=2112094, After=2112092, chg -0.00%
Signed-off-by: Hernán Gonzalez <hernan@vanguardiasur.com.ar>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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This patch addresses the fuse privileged mounted filesystems in
environments which are unwilling to accept the risk of trusting the
signature verification and want to always fail safe, but are for example
using a pre-built kernel.
This patch defines a new builtin policy named "fail_securely", which can
be specified on the boot command line as an argument to "ima_policy=".
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Dongsu Park <dongsu@kinvolk.io>
Cc: Alban Crequy <alban@kinvolk.io>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
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The IMA_APPRAISE and IMA_HASH policies overlap. Clear IMA_HASH properly.
Fixes: da1b0029f527 ("ima: support new "hash" and "dont_hash" policy actions")
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
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This patch addresses the fuse privileged mounted filesystems in a "secure"
environment, with a correctly enforced security policy, which is willing
to assume the inherent risk of specific fuse filesystems that are well
defined and properly implemented.
As there is no way for the kernel to detect file changes, the kernel
ignores the cached file integrity results and re-measures, re-appraises,
and re-audits the file.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Dongsu Park <dongsu@kinvolk.io>
Cc: Alban Crequy <alban@kinvolk.io>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
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FUSE can be mounted by unprivileged users either today with fusermount
installed with setuid, or soon with the upcoming patches to allow FUSE
mounts in a non-init user namespace.
This patch addresses the new unprivileged non-init mounted filesystems,
which are untrusted, by failing the signature verification.
This patch defines two new flags SB_I_IMA_UNVERIFIABLE_SIGNATURE and
SB_I_UNTRUSTED_MOUNTER.
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Seth Forshee <seth.forshee@canonical.com>
Cc: Dongsu Park <dongsu@kinvolk.io>
Cc: Alban Crequy <alban@kinvolk.io>
Acked-by: Serge Hallyn <serge@hallyn.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
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The existing BPRM_CHECK functionality in IMA validates against the
credentials of the existing process, not any new credentials that the
child process may transition to. Add an additional CREDS_CHECK target
and refactor IMA to pass the appropriate creds structure. In
ima_bprm_check(), check with both the existing process credentials and
the credentials that will be committed when the new process is started.
This will not change behaviour unless the system policy is extended to
include CREDS_CHECK targets - BPRM_CHECK will continue to check the same
credentials that it did previously.
After this patch, an IMA policy rule along the lines of:
measure func=CREDS_CHECK subj_type=unconfined_t
will trigger if a process is executed and runs as unconfined_t, ignoring
the context of the parent process. This is in contrast to:
measure func=BPRM_CHECK subj_type=unconfined_t
which will trigger if the process that calls exec() is already executing
in unconfined_t, ignoring the context that the child process executes
into.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Changelog:
- initialize ima_creds_status
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security/integrity/digsig.c has build errors on some $ARCH due to a
missing header file, so add it.
security/integrity/digsig.c:146:2: error: implicit declaration of function 'vfree' [-Werror=implicit-function-declaration]
Reported-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Mimi Zohar <zohar@linux.vnet.ibm.com>
Cc: linux-integrity@vger.kernel.org
Link: http://kisskb.ellerman.id.au/kisskb/head/13396/
Signed-off-by: James Morris <james.morris@microsoft.com>
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Pull inode->i_version cleanup from Jeff Layton:
"Goffredo went ahead and sent a patch to rename this function, and
reverse its sense, as we discussed last week.
The patch is very straightforward and I figure it's probably best to
go ahead and merge this to get the API as settled as possible"
* tag 'iversion-v4.16-2' of git://git.kernel.org/pub/scm/linux/kernel/git/jlayton/linux:
iversion: Rename make inode_cmp_iversion{+raw} to inode_eq_iversion{+raw}
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Intermittently security.ima is not being written for new files. This
patch re-initializes the new slab iint->atomic_flags field before
freeing it.
Fixes: commit 0d73a55208e9 ("ima: re-introduce own integrity cache lock")
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
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Matthew Garrett
Sudeep Holla
Stefan Berger
Mimi Zohar
Al Viro
Linus Torvalds
Dan Carpenter
Colin Ian King
Petko Manolov
Yisheng Xie
Petr Vorel
Richard Guy Briggs
Seth Forshee
Martin Townsend
Sascha Hauer
Thiago Jung Bauermann
Tycho Andersen
Jiandi An
Hernán Gonzalez
Randy Dunlap