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Add a config option (IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY) that, when enabled, allows keys to be added to the IMA keyrings by userspace - with the restriction that each must be signed by a key in the system trusted keyrings. EPERM will be returned if this option is disabled, ENOKEY will be returned if no authoritative key can be found and EKEYREJECTED will be returned if the signature doesn't match. Other errors such as ENOPKG may also be returned. If this new option is enabled, the builtin system keyring is searched, as is the secondary system keyring if that is also enabled. Intermediate keys between the builtin system keyring and the key being added can be added to the secondary keyring (which replaces .ima_mok) to form a trust chain - provided they are also validly signed by a key in one of the trusted keyrings. The .ima_mok keyring is then removed and the IMA blacklist keyring gets its own config option (IMA_BLACKLIST_KEYRING). Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
210 lines
6.4 KiB
Plaintext
210 lines
6.4 KiB
Plaintext
# IBM Integrity Measurement Architecture
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#
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config IMA
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bool "Integrity Measurement Architecture(IMA)"
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select SECURITYFS
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select CRYPTO
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select CRYPTO_HMAC
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select CRYPTO_MD5
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select CRYPTO_SHA1
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select CRYPTO_HASH_INFO
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select TCG_TPM if HAS_IOMEM && !UML
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select TCG_TIS if TCG_TPM && X86
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select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
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help
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The Trusted Computing Group(TCG) runtime Integrity
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Measurement Architecture(IMA) maintains a list of hash
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values of executables and other sensitive system files,
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as they are read or executed. If an attacker manages
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to change the contents of an important system file
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being measured, we can tell.
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If your system has a TPM chip, then IMA also maintains
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an aggregate integrity value over this list inside the
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TPM hardware, so that the TPM can prove to a third party
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whether or not critical system files have been modified.
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Read <http://www.usenix.org/events/sec04/tech/sailer.html>
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to learn more about IMA.
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If unsure, say N.
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config IMA_MEASURE_PCR_IDX
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int
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depends on IMA
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range 8 14
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default 10
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help
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IMA_MEASURE_PCR_IDX determines the TPM PCR register index
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that IMA uses to maintain the integrity aggregate of the
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measurement list. If unsure, use the default 10.
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config IMA_LSM_RULES
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bool
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depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
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default y
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help
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Disabling this option will disregard LSM based policy rules.
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choice
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prompt "Default template"
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default IMA_NG_TEMPLATE
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depends on IMA
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help
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Select the default IMA measurement template.
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The original 'ima' measurement list template contains a
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hash, defined as 20 bytes, and a null terminated pathname,
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limited to 255 characters. The 'ima-ng' measurement list
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template permits both larger hash digests and longer
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pathnames.
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config IMA_TEMPLATE
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bool "ima"
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config IMA_NG_TEMPLATE
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bool "ima-ng (default)"
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config IMA_SIG_TEMPLATE
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bool "ima-sig"
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endchoice
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config IMA_DEFAULT_TEMPLATE
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string
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depends on IMA
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default "ima" if IMA_TEMPLATE
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default "ima-ng" if IMA_NG_TEMPLATE
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default "ima-sig" if IMA_SIG_TEMPLATE
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choice
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prompt "Default integrity hash algorithm"
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default IMA_DEFAULT_HASH_SHA1
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depends on IMA
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help
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Select the default hash algorithm used for the measurement
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list, integrity appraisal and audit log. The compiled default
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hash algorithm can be overwritten using the kernel command
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line 'ima_hash=' option.
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config IMA_DEFAULT_HASH_SHA1
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bool "SHA1 (default)"
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depends on CRYPTO_SHA1
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config IMA_DEFAULT_HASH_SHA256
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bool "SHA256"
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depends on CRYPTO_SHA256 && !IMA_TEMPLATE
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config IMA_DEFAULT_HASH_SHA512
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bool "SHA512"
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depends on CRYPTO_SHA512 && !IMA_TEMPLATE
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config IMA_DEFAULT_HASH_WP512
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bool "WP512"
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depends on CRYPTO_WP512 && !IMA_TEMPLATE
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endchoice
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config IMA_DEFAULT_HASH
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string
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depends on IMA
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default "sha1" if IMA_DEFAULT_HASH_SHA1
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default "sha256" if IMA_DEFAULT_HASH_SHA256
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default "sha512" if IMA_DEFAULT_HASH_SHA512
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default "wp512" if IMA_DEFAULT_HASH_WP512
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config IMA_WRITE_POLICY
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bool "Enable multiple writes to the IMA policy"
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depends on IMA
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default n
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help
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IMA policy can now be updated multiple times. The new rules get
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appended to the original policy. Have in mind that the rules are
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scanned in FIFO order so be careful when you design and add new ones.
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If unsure, say N.
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config IMA_READ_POLICY
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bool "Enable reading back the current IMA policy"
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depends on IMA
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default y if IMA_WRITE_POLICY
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default n if !IMA_WRITE_POLICY
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help
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It is often useful to be able to read back the IMA policy. It is
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even more important after introducing CONFIG_IMA_WRITE_POLICY.
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This option allows the root user to see the current policy rules.
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config IMA_APPRAISE
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bool "Appraise integrity measurements"
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depends on IMA
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default n
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help
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This option enables local measurement integrity appraisal.
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It requires the system to be labeled with a security extended
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attribute containing the file hash measurement. To protect
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the security extended attributes from offline attack, enable
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and configure EVM.
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For more information on integrity appraisal refer to:
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<http://linux-ima.sourceforge.net>
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If unsure, say N.
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config IMA_TRUSTED_KEYRING
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bool "Require all keys on the .ima keyring be signed (deprecated)"
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depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
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depends on INTEGRITY_ASYMMETRIC_KEYS
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select INTEGRITY_TRUSTED_KEYRING
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default y
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help
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This option requires that all keys added to the .ima
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keyring be signed by a key on the system trusted keyring.
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This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
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config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
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bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
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depends on SYSTEM_TRUSTED_KEYRING
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depends on SECONDARY_TRUSTED_KEYRING
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depends on INTEGRITY_ASYMMETRIC_KEYS
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select INTEGRITY_TRUSTED_KEYRING
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default n
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help
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Keys may be added to the IMA or IMA blacklist keyrings, if the
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key is validly signed by a CA cert in the system built-in or
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secondary trusted keyrings.
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Intermediate keys between those the kernel has compiled in and the
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IMA keys to be added may be added to the system secondary keyring,
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provided they are validly signed by a key already resident in the
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built-in or secondary trusted keyrings.
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config IMA_BLACKLIST_KEYRING
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bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
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depends on SYSTEM_TRUSTED_KEYRING
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depends on IMA_TRUSTED_KEYRING
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default n
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help
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This option creates an IMA blacklist keyring, which contains all
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revoked IMA keys. It is consulted before any other keyring. If
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the search is successful the requested operation is rejected and
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an error is returned to the caller.
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config IMA_LOAD_X509
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bool "Load X509 certificate onto the '.ima' trusted keyring"
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depends on IMA_TRUSTED_KEYRING
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default n
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help
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File signature verification is based on the public keys
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loaded on the .ima trusted keyring. These public keys are
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X509 certificates signed by a trusted key on the
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.system keyring. This option enables X509 certificate
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loading from the kernel onto the '.ima' trusted keyring.
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config IMA_X509_PATH
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string "IMA X509 certificate path"
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depends on IMA_LOAD_X509
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default "/etc/keys/x509_ima.der"
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help
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This option defines IMA X509 certificate path.
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config IMA_APPRAISE_SIGNED_INIT
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bool "Require signed user-space initialization"
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depends on IMA_LOAD_X509
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default n
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help
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This option requires user-space init to be signed.
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