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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_MEASURE_PCR_IDX
 31         int
 32         depends on IMA
 33         range 8 14
 34         default 10
 35         help
 36           IMA_MEASURE_PCR_IDX determines the TPM PCR register index
 37           that IMA uses to maintain the integrity aggregate of the
 38           measurement list.  If unsure, use the default 10.
 39 
 40 config IMA_LSM_RULES
 41         bool
 42         depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK)
 43         default y
 44         help
 45           Disabling this option will disregard LSM based policy rules.
 46 
 47 choice
 48         prompt "Default template"
 49         default IMA_NG_TEMPLATE
 50         depends on IMA
 51         help
 52           Select the default IMA measurement template.
 53 
 54           The original 'ima' measurement list template contains a
 55           hash, defined as 20 bytes, and a null terminated pathname,
 56           limited to 255 characters.  The 'ima-ng' measurement list
 57           template permits both larger hash digests and longer
 58           pathnames.
 59 
 60         config IMA_TEMPLATE
 61                 bool "ima"
 62         config IMA_NG_TEMPLATE
 63                 bool "ima-ng (default)"
 64         config IMA_SIG_TEMPLATE
 65                 bool "ima-sig"
 66 endchoice
 67 
 68 config IMA_DEFAULT_TEMPLATE
 69         string
 70         depends on IMA
 71         default "ima" if IMA_TEMPLATE
 72         default "ima-ng" if IMA_NG_TEMPLATE
 73         default "ima-sig" if IMA_SIG_TEMPLATE
 74 
 75 choice
 76         prompt "Default integrity hash algorithm"
 77         default IMA_DEFAULT_HASH_SHA1
 78         depends on IMA
 79         help
 80            Select the default hash algorithm used for the measurement
 81            list, integrity appraisal and audit log.  The compiled default
 82            hash algorithm can be overwritten using the kernel command
 83            line 'ima_hash=' option.
 84 
 85         config IMA_DEFAULT_HASH_SHA1
 86                 bool "SHA1 (default)"
 87                 depends on CRYPTO_SHA1
 88 
 89         config IMA_DEFAULT_HASH_SHA256
 90                 bool "SHA256"
 91                 depends on CRYPTO_SHA256 && !IMA_TEMPLATE
 92 
 93         config IMA_DEFAULT_HASH_SHA512
 94                 bool "SHA512"
 95                 depends on CRYPTO_SHA512 && !IMA_TEMPLATE
 96 
 97         config IMA_DEFAULT_HASH_WP512
 98                 bool "WP512"
 99                 depends on CRYPTO_WP512 && !IMA_TEMPLATE
100 endchoice
101 
102 config IMA_DEFAULT_HASH
103         string
104         depends on IMA
105         default "sha1" if IMA_DEFAULT_HASH_SHA1
106         default "sha256" if IMA_DEFAULT_HASH_SHA256
107         default "sha512" if IMA_DEFAULT_HASH_SHA512
108         default "wp512" if IMA_DEFAULT_HASH_WP512
109 
110 config IMA_WRITE_POLICY
111         bool "Enable multiple writes to the IMA policy"
112         depends on IMA
113         default n
114         help
115           IMA policy can now be updated multiple times.  The new rules get
116           appended to the original policy.  Have in mind that the rules are
117           scanned in FIFO order so be careful when you design and add new ones.
118 
119           If unsure, say N.
120 
121 config IMA_READ_POLICY
122         bool "Enable reading back the current IMA policy"
123         depends on IMA
124         default y if IMA_WRITE_POLICY
125         default n if !IMA_WRITE_POLICY
126         help
127            It is often useful to be able to read back the IMA policy.  It is
128            even more important after introducing CONFIG_IMA_WRITE_POLICY.
129            This option allows the root user to see the current policy rules.
130 
131 config IMA_APPRAISE
132         bool "Appraise integrity measurements"
133         depends on IMA
134         default n
135         help
136           This option enables local measurement integrity appraisal.
137           It requires the system to be labeled with a security extended
138           attribute containing the file hash measurement.  To protect
139           the security extended attributes from offline attack, enable
140           and configure EVM.
141 
142           For more information on integrity appraisal refer to:
143           <http://linux-ima.sourceforge.net>
144           If unsure, say N.
145 
146 config IMA_TRUSTED_KEYRING
147         bool "Require all keys on the .ima keyring be signed (deprecated)"
148         depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
149         depends on INTEGRITY_ASYMMETRIC_KEYS
150         select INTEGRITY_TRUSTED_KEYRING
151         default y
152         help
153            This option requires that all keys added to the .ima
154            keyring be signed by a key on the system trusted keyring.
155 
156            This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
157 
158 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
159         bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
160         depends on SYSTEM_TRUSTED_KEYRING
161         depends on SECONDARY_TRUSTED_KEYRING
162         depends on INTEGRITY_ASYMMETRIC_KEYS
163         select INTEGRITY_TRUSTED_KEYRING
164         default n
165         help
166           Keys may be added to the IMA or IMA blacklist keyrings, if the
167           key is validly signed by a CA cert in the system built-in or
168           secondary trusted keyrings.
169 
170           Intermediate keys between those the kernel has compiled in and the
171           IMA keys to be added may be added to the system secondary keyring,
172           provided they are validly signed by a key already resident in the
173           built-in or secondary trusted keyrings.
174 
175 config IMA_BLACKLIST_KEYRING
176         bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
177         depends on SYSTEM_TRUSTED_KEYRING
178         depends on IMA_TRUSTED_KEYRING
179         default n
180         help
181            This option creates an IMA blacklist keyring, which contains all
182            revoked IMA keys.  It is consulted before any other keyring.  If
183            the search is successful the requested operation is rejected and
184            an error is returned to the caller.
185 
186 config IMA_LOAD_X509
187         bool "Load X509 certificate onto the '.ima' trusted keyring"
188         depends on IMA_TRUSTED_KEYRING
189         default n
190         help
191            File signature verification is based on the public keys
192            loaded on the .ima trusted keyring. These public keys are
193            X509 certificates signed by a trusted key on the
194            .system keyring.  This option enables X509 certificate
195            loading from the kernel onto the '.ima' trusted keyring.
196 
197 config IMA_X509_PATH
198         string "IMA X509 certificate path"
199         depends on IMA_LOAD_X509
200         default "/etc/keys/x509_ima.der"
201         help
202            This option defines IMA X509 certificate path.
203 
204 config IMA_APPRAISE_SIGNED_INIT
205         bool "Require signed user-space initialization"
206         depends on IMA_LOAD_X509
207         default n
208         help
209            This option requires user-space init to be signed.

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