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Linux/security/integrity/ima/Kconfig

  1 # IBM Integrity Measurement Architecture
  2 #
  3 config IMA
  4         bool "Integrity Measurement Architecture(IMA)"
  5         select SECURITYFS
  6         select CRYPTO
  7         select CRYPTO_HMAC
  8         select CRYPTO_MD5
  9         select CRYPTO_SHA1
 10         select CRYPTO_HASH_INFO
 11         select TCG_TPM if HAS_IOMEM && !UML
 12         select TCG_TIS if TCG_TPM && X86
 13         select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
 14         help
 15           The Trusted Computing Group(TCG) runtime Integrity
 16           Measurement Architecture(IMA) maintains a list of hash
 17           values of executables and other sensitive system files,
 18           as they are read or executed. If an attacker manages
 19           to change the contents of an important system file
 20           being measured, we can tell.
 21 
 22           If your system has a TPM chip, then IMA also maintains
 23           an aggregate integrity value over this list inside the
 24           TPM hardware, so that the TPM can prove to a third party
 25           whether or not critical system files have been modified.
 26           Read <http://www.usenix.org/events/sec04/tech/sailer.html>
 27           to learn more about IMA.
 28           If unsure, say N.
 29 
 30 config IMA_KEXEC
 31         bool "Enable carrying the IMA measurement list across a soft boot"
 32         depends on IMA && TCG_TPM && HAVE_IMA_KEXEC
 33         default n
 34         help
 35            TPM PCRs are only reset on a hard reboot.  In order to validate
 36            a TPM's quote after a soft boot, the IMA measurement list of the
 37            running kernel must be saved and restored on boot.
 38 
 39            Depending on the IMA policy, the measurement list can grow to
 40            be very large.
 41 
 42 config IMA_MEASURE_PCR_IDX
 43         int
 44         depends on IMA
 45         range 8 14
 46         default 10
 47         help
 48           IMA_MEASURE_PCR_IDX determines the TPM PCR register index
 49           that IMA uses to maintain the integrity aggregate of the
 50           measurement list.  If unsure, use the default 10.
 51 
 52 config IMA_LSM_RULES
 53         bool
 54         depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
 55         default y
 56         help
 57           Disabling this option will disregard LSM based policy rules.
 58 
 59 choice
 60         prompt "Default template"
 61         default IMA_NG_TEMPLATE
 62         depends on IMA
 63         help
 64           Select the default IMA measurement template.
 65 
 66           The original 'ima' measurement list template contains a
 67           hash, defined as 20 bytes, and a null terminated pathname,
 68           limited to 255 characters.  The 'ima-ng' measurement list
 69           template permits both larger hash digests and longer
 70           pathnames.
 71 
 72         config IMA_TEMPLATE
 73                 bool "ima"
 74         config IMA_NG_TEMPLATE
 75                 bool "ima-ng (default)"
 76         config IMA_SIG_TEMPLATE
 77                 bool "ima-sig"
 78 endchoice
 79 
 80 config IMA_DEFAULT_TEMPLATE
 81         string
 82         depends on IMA
 83         default "ima" if IMA_TEMPLATE
 84         default "ima-ng" if IMA_NG_TEMPLATE
 85         default "ima-sig" if IMA_SIG_TEMPLATE
 86 
 87 choice
 88         prompt "Default integrity hash algorithm"
 89         default IMA_DEFAULT_HASH_SHA1
 90         depends on IMA
 91         help
 92            Select the default hash algorithm used for the measurement
 93            list, integrity appraisal and audit log.  The compiled default
 94            hash algorithm can be overwritten using the kernel command
 95            line 'ima_hash=' option.
 96 
 97         config IMA_DEFAULT_HASH_SHA1
 98                 bool "SHA1 (default)"
 99                 depends on CRYPTO_SHA1
100 
101         config IMA_DEFAULT_HASH_SHA256
102                 bool "SHA256"
103                 depends on CRYPTO_SHA256 && !IMA_TEMPLATE
104 
105         config IMA_DEFAULT_HASH_SHA512
106                 bool "SHA512"
107                 depends on CRYPTO_SHA512 && !IMA_TEMPLATE
108 
109         config IMA_DEFAULT_HASH_WP512
110                 bool "WP512"
111                 depends on CRYPTO_WP512 && !IMA_TEMPLATE
112 endchoice
113 
114 config IMA_DEFAULT_HASH
115         string
116         depends on IMA
117         default "sha1" if IMA_DEFAULT_HASH_SHA1
118         default "sha256" if IMA_DEFAULT_HASH_SHA256
119         default "sha512" if IMA_DEFAULT_HASH_SHA512
120         default "wp512" if IMA_DEFAULT_HASH_WP512
121 
122 config IMA_WRITE_POLICY
123         bool "Enable multiple writes to the IMA policy"
124         depends on IMA
125         default n
126         help
127           IMA policy can now be updated multiple times.  The new rules get
128           appended to the original policy.  Have in mind that the rules are
129           scanned in FIFO order so be careful when you design and add new ones.
130 
131           If unsure, say N.
132 
133 config IMA_READ_POLICY
134         bool "Enable reading back the current IMA policy"
135         depends on IMA
136         default y if IMA_WRITE_POLICY
137         default n if !IMA_WRITE_POLICY
138         help
139            It is often useful to be able to read back the IMA policy.  It is
140            even more important after introducing CONFIG_IMA_WRITE_POLICY.
141            This option allows the root user to see the current policy rules.
142 
143 config IMA_APPRAISE
144         bool "Appraise integrity measurements"
145         depends on IMA
146         default n
147         help
148           This option enables local measurement integrity appraisal.
149           It requires the system to be labeled with a security extended
150           attribute containing the file hash measurement.  To protect
151           the security extended attributes from offline attack, enable
152           and configure EVM.
153 
154           For more information on integrity appraisal refer to:
155           <http://linux-ima.sourceforge.net>
156           If unsure, say N.
157 
158 config IMA_TRUSTED_KEYRING
159         bool "Require all keys on the .ima keyring be signed (deprecated)"
160         depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
161         depends on INTEGRITY_ASYMMETRIC_KEYS
162         select INTEGRITY_TRUSTED_KEYRING
163         default y
164         help
165            This option requires that all keys added to the .ima
166            keyring be signed by a key on the system trusted keyring.
167 
168            This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
169 
170 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
171         bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
172         depends on SYSTEM_TRUSTED_KEYRING
173         depends on SECONDARY_TRUSTED_KEYRING
174         depends on INTEGRITY_ASYMMETRIC_KEYS
175         select INTEGRITY_TRUSTED_KEYRING
176         default n
177         help
178           Keys may be added to the IMA or IMA blacklist keyrings, if the
179           key is validly signed by a CA cert in the system built-in or
180           secondary trusted keyrings.
181 
182           Intermediate keys between those the kernel has compiled in and the
183           IMA keys to be added may be added to the system secondary keyring,
184           provided they are validly signed by a key already resident in the
185           built-in or secondary trusted keyrings.
186 
187 config IMA_BLACKLIST_KEYRING
188         bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
189         depends on SYSTEM_TRUSTED_KEYRING
190         depends on IMA_TRUSTED_KEYRING
191         default n
192         help
193            This option creates an IMA blacklist keyring, which contains all
194            revoked IMA keys.  It is consulted before any other keyring.  If
195            the search is successful the requested operation is rejected and
196            an error is returned to the caller.
197 
198 config IMA_LOAD_X509
199         bool "Load X509 certificate onto the '.ima' trusted keyring"
200         depends on IMA_TRUSTED_KEYRING
201         default n
202         help
203            File signature verification is based on the public keys
204            loaded on the .ima trusted keyring. These public keys are
205            X509 certificates signed by a trusted key on the
206            .system keyring.  This option enables X509 certificate
207            loading from the kernel onto the '.ima' trusted keyring.
208 
209 config IMA_X509_PATH
210         string "IMA X509 certificate path"
211         depends on IMA_LOAD_X509
212         default "/etc/keys/x509_ima.der"
213         help
214            This option defines IMA X509 certificate path.
215 
216 config IMA_APPRAISE_SIGNED_INIT
217         bool "Require signed user-space initialization"
218         depends on IMA_LOAD_X509
219         default n
220         help
221            This option requires user-space init to be signed.

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