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Thomas Gleixnerec8f24b2019-05-19 13:07:45 +01001# SPDX-License-Identifier: GPL-2.0-only
Mimi Zohar3323eec2009-02-04 09:06:58 -05002# IBM Integrity Measurement Architecture
3#
4config IMA
5 bool "Integrity Measurement Architecture(IMA)"
Mimi Zohar3323eec2009-02-04 09:06:58 -05006 select SECURITYFS
7 select CRYPTO
8 select CRYPTO_HMAC
Mimi Zohar3323eec2009-02-04 09:06:58 -05009 select CRYPTO_SHA1
Dmitry Kasatkinc7c8bb22013-04-25 10:43:56 +030010 select CRYPTO_HASH_INFO
Randy Dunlap644f1742023-02-23 19:27:03 -080011 select TCG_TPM if HAS_IOMEM
Randy Dunlapa69f1582012-02-24 11:28:05 -080012 select TCG_TIS if TCG_TPM && X86
Jiandi Anfac37c622018-03-06 23:26:26 -060013 select TCG_CRB if TCG_TPM && ACPI
Michael Ellerman63a0eb72014-12-03 17:04:50 +110014 select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
Stefan Berger2afd020a2018-06-04 16:54:54 -040015 select INTEGRITY_AUDIT if AUDIT
Mimi Zohar3323eec2009-02-04 09:06:58 -050016 help
17 The Trusted Computing Group(TCG) runtime Integrity
18 Measurement Architecture(IMA) maintains a list of hash
19 values of executables and other sensitive system files,
20 as they are read or executed. If an attacker manages
21 to change the contents of an important system file
22 being measured, we can tell.
23
24 If your system has a TPM chip, then IMA also maintains
25 an aggregate integrity value over this list inside the
26 TPM hardware, so that the TPM can prove to a third party
27 whether or not critical system files have been modified.
Alexander A. Klimovc9fecf52020-07-05 23:45:12 +020028 Read <https://www.usenix.org/events/sec04/tech/sailer.html>
Mimi Zohar3323eec2009-02-04 09:06:58 -050029 to learn more about IMA.
30 If unsure, say N.
31
Mimi Zohard1588472016-12-19 16:22:42 -080032config IMA_KEXEC
33 bool "Enable carrying the IMA measurement list across a soft boot"
34 depends on IMA && TCG_TPM && HAVE_IMA_KEXEC
35 default n
36 help
37 TPM PCRs are only reset on a hard reboot. In order to validate
38 a TPM's quote after a soft boot, the IMA measurement list of the
39 running kernel must be saved and restored on boot.
40
41 Depending on the IMA policy, the measurement list can grow to
42 be very large.
43
Mimi Zohar3323eec2009-02-04 09:06:58 -050044config IMA_MEASURE_PCR_IDX
45 int
46 depends on IMA
47 range 8 14
48 default 10
49 help
50 IMA_MEASURE_PCR_IDX determines the TPM PCR register index
51 that IMA uses to maintain the integrity aggregate of the
52 measurement list. If unsure, use the default 10.
53
Mimi Zohar4af46622009-02-04 09:07:00 -050054config IMA_LSM_RULES
55 bool
Tyler Hicks17682152020-06-23 18:38:23 -050056 depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK || SECURITY_APPARMOR)
Mimi Zohar4af46622009-02-04 09:07:00 -050057 default y
58 help
Randy Dunlapb53fab92009-02-12 09:54:14 -080059 Disabling this option will disregard LSM based policy rules.
Mimi Zohar2fe5d6d2012-02-13 10:15:05 -050060
Mimi Zohar42865872013-06-07 12:16:34 +020061choice
62 prompt "Default template"
63 default IMA_NG_TEMPLATE
64 depends on IMA
65 help
66 Select the default IMA measurement template.
67
68 The original 'ima' measurement list template contains a
69 hash, defined as 20 bytes, and a null terminated pathname,
70 limited to 255 characters. The 'ima-ng' measurement list
71 template permits both larger hash digests and longer
GUO Zihua891163a2022-04-07 10:16:19 +080072 pathnames. The configured default template can be replaced
73 by specifying "ima_template=" on the boot command line.
Mimi Zohar42865872013-06-07 12:16:34 +020074
Mimi Zohar42865872013-06-07 12:16:34 +020075 config IMA_NG_TEMPLATE
76 bool "ima-ng (default)"
Mimi Zoharbcbc9b0c2013-07-23 11:15:00 -040077 config IMA_SIG_TEMPLATE
78 bool "ima-sig"
Mimi Zohar42865872013-06-07 12:16:34 +020079endchoice
80
81config IMA_DEFAULT_TEMPLATE
82 string
83 depends on IMA
Mimi Zohar42865872013-06-07 12:16:34 +020084 default "ima-ng" if IMA_NG_TEMPLATE
Mimi Zoharbcbc9b0c2013-07-23 11:15:00 -040085 default "ima-sig" if IMA_SIG_TEMPLATE
Mimi Zohar42865872013-06-07 12:16:34 +020086
Mimi Zohare7a2ad72013-06-07 12:16:37 +020087choice
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)"
Ben Hutchings38d19262017-05-02 19:27:00 +010099 depends on CRYPTO_SHA1=y
Mimi Zohare7a2ad72013-06-07 12:16:37 +0200100
101 config IMA_DEFAULT_HASH_SHA256
102 bool "SHA256"
GUO Zihua891163a2022-04-07 10:16:19 +0800103 depends on CRYPTO_SHA256=y
Mimi Zohare7a2ad72013-06-07 12:16:37 +0200104
105 config IMA_DEFAULT_HASH_SHA512
106 bool "SHA512"
GUO Zihua891163a2022-04-07 10:16:19 +0800107 depends on CRYPTO_SHA512=y
Mimi Zohare7a2ad72013-06-07 12:16:37 +0200108
109 config IMA_DEFAULT_HASH_WP512
110 bool "WP512"
GUO Zihua891163a2022-04-07 10:16:19 +0800111 depends on CRYPTO_WP512=y
Tianjia Zhang5780b9a2020-02-10 20:44:40 +0800112
113 config IMA_DEFAULT_HASH_SM3
114 bool "SM3"
Tianjia Zhangb6018af2022-11-25 20:18:40 +0800115 depends on CRYPTO_SM3_GENERIC=y
Mimi Zohare7a2ad72013-06-07 12:16:37 +0200116endchoice
117
118config IMA_DEFAULT_HASH
119 string
120 depends on IMA
121 default "sha1" if IMA_DEFAULT_HASH_SHA1
122 default "sha256" if IMA_DEFAULT_HASH_SHA256
123 default "sha512" if IMA_DEFAULT_HASH_SHA512
124 default "wp512" if IMA_DEFAULT_HASH_WP512
Tianjia Zhang5780b9a2020-02-10 20:44:40 +0800125 default "sm3" if IMA_DEFAULT_HASH_SM3
Mimi Zohare7a2ad72013-06-07 12:16:37 +0200126
Petko Manolov38d859f2015-12-02 17:47:54 +0200127config IMA_WRITE_POLICY
128 bool "Enable multiple writes to the IMA policy"
129 depends on IMA
130 default n
131 help
132 IMA policy can now be updated multiple times. The new rules get
133 appended to the original policy. Have in mind that the rules are
134 scanned in FIFO order so be careful when you design and add new ones.
135
136 If unsure, say N.
137
Petko Manolov80eae202015-12-02 17:47:56 +0200138config IMA_READ_POLICY
139 bool "Enable reading back the current IMA policy"
140 depends on IMA
141 default y if IMA_WRITE_POLICY
142 default n if !IMA_WRITE_POLICY
143 help
144 It is often useful to be able to read back the IMA policy. It is
145 even more important after introducing CONFIG_IMA_WRITE_POLICY.
146 This option allows the root user to see the current policy rules.
147
Mimi Zohar2fe5d6d2012-02-13 10:15:05 -0500148config IMA_APPRAISE
149 bool "Appraise integrity measurements"
150 depends on IMA
151 default n
152 help
153 This option enables local measurement integrity appraisal.
154 It requires the system to be labeled with a security extended
155 attribute containing the file hash measurement. To protect
156 the security extended attributes from offline attack, enable
157 and configure EVM.
158
159 For more information on integrity appraisal refer to:
160 <http://linux-ima.sourceforge.net>
161 If unsure, say N.
Mimi Zohar7d2ce232013-08-13 08:47:43 -0400162
Eric Richterd9580832018-10-09 23:00:37 +0530163config IMA_ARCH_POLICY
164 bool "Enable loading an IMA architecture specific policy"
Linus Torvaldsaefcf2f2019-09-28 08:14:15 -0700165 depends on (KEXEC_SIG && IMA) || IMA_APPRAISE \
Nayna Jain9e1e5d42019-06-07 15:12:06 -0400166 && INTEGRITY_ASYMMETRIC_KEYS
Eric Richterd9580832018-10-09 23:00:37 +0530167 default n
168 help
169 This option enables loading an IMA architecture specific policy
170 based on run time secure boot flags.
171
Mimi Zoharef968372018-07-13 14:06:01 -0400172config IMA_APPRAISE_BUILD_POLICY
173 bool "IMA build time configured policy rules"
174 depends on IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS
175 default n
176 help
177 This option defines an IMA appraisal policy at build time, which
178 is enforced at run time without having to specify a builtin
179 policy name on the boot command line. The build time appraisal
180 policy rules persist after loading a custom policy.
181
182 Depending on the rules configured, this policy may require kernel
183 modules, firmware, the kexec kernel image, and/or the IMA policy
184 to be signed. Unsigned files might prevent the system from
185 booting or applications from working properly.
186
187config IMA_APPRAISE_REQUIRE_FIRMWARE_SIGS
188 bool "Appraise firmware signatures"
189 depends on IMA_APPRAISE_BUILD_POLICY
190 default n
191 help
192 This option defines a policy requiring all firmware to be signed,
193 including the regulatory.db. If both this option and
194 CFG80211_REQUIRE_SIGNED_REGDB are enabled, then both signature
195 verification methods are necessary.
196
197config IMA_APPRAISE_REQUIRE_KEXEC_SIGS
198 bool "Appraise kexec kernel image signatures"
199 depends on IMA_APPRAISE_BUILD_POLICY
200 default n
201 help
202 Enabling this rule will require all kexec'ed kernel images to
203 be signed and verified by a public key on the trusted IMA
204 keyring.
205
206 Kernel image signatures can not be verified by the original
207 kexec_load syscall. Enabling this rule will prevent its
208 usage.
209
210config IMA_APPRAISE_REQUIRE_MODULE_SIGS
211 bool "Appraise kernel modules signatures"
212 depends on IMA_APPRAISE_BUILD_POLICY
213 default n
214 help
215 Enabling this rule will require all kernel modules to be signed
216 and verified by a public key on the trusted IMA keyring.
217
218 Kernel module signatures can only be verified by IMA-appraisal,
219 via the finit_module syscall. Enabling this rule will prevent
220 the usage of the init_module syscall.
221
222config IMA_APPRAISE_REQUIRE_POLICY_SIGS
223 bool "Appraise IMA policy signature"
224 depends on IMA_APPRAISE_BUILD_POLICY
225 default n
226 help
227 Enabling this rule will require the IMA policy to be signed and
228 and verified by a key on the trusted IMA keyring.
229
Mimi Zohare1f5e012017-04-24 22:06:49 -0400230config IMA_APPRAISE_BOOTPARAM
231 bool "ima_appraise boot parameter"
Bruno Meneguele311aa6a2020-07-13 13:48:30 -0300232 depends on IMA_APPRAISE
Mimi Zohare1f5e012017-04-24 22:06:49 -0400233 default y
234 help
235 This option enables the different "ima_appraise=" modes
236 (eg. fix, log) from the boot command line.
237
Thiago Jung Bauermann9044d622019-06-27 23:19:28 -0300238config IMA_APPRAISE_MODSIG
239 bool "Support module-style signatures for appraisal"
240 depends on IMA_APPRAISE
Thiago Jung Bauermann39b07092019-06-27 23:19:30 -0300241 depends on INTEGRITY_ASYMMETRIC_KEYS
242 select PKCS7_MESSAGE_PARSER
243 select MODULE_SIG_FORMAT
Thiago Jung Bauermann9044d622019-06-27 23:19:28 -0300244 default n
245 help
246 Adds support for signatures appended to files. The format of the
247 appended signature is the same used for signed kernel modules.
248 The modsig keyword can be used in the IMA policy to allow a hook
249 to accept such signatures.
250
David Howells56104cf2016-04-07 09:45:23 +0100251config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
252 bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
253 depends on SYSTEM_TRUSTED_KEYRING
254 depends on SECONDARY_TRUSTED_KEYRING
255 depends on INTEGRITY_ASYMMETRIC_KEYS
256 select INTEGRITY_TRUSTED_KEYRING
257 default n
258 help
259 Keys may be added to the IMA or IMA blacklist keyrings, if the
260 key is validly signed by a CA cert in the system built-in or
Eric Snowberg90f6f692023-05-22 19:09:43 -0400261 secondary trusted keyrings. The key must also have the
262 digitalSignature usage set.
David Howells56104cf2016-04-07 09:45:23 +0100263
264 Intermediate keys between those the kernel has compiled in and the
265 IMA keys to be added may be added to the system secondary keyring,
266 provided they are validly signed by a key already resident in the
267 built-in or secondary trusted keyrings.
268
269config IMA_BLACKLIST_KEYRING
270 bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
Petko Manolov41c89b62015-12-02 17:47:55 +0200271 depends on SYSTEM_TRUSTED_KEYRING
272 depends on IMA_TRUSTED_KEYRING
273 default n
274 help
David Howells56104cf2016-04-07 09:45:23 +0100275 This option creates an IMA blacklist keyring, which contains all
276 revoked IMA keys. It is consulted before any other keyring. If
277 the search is successful the requested operation is rejected and
278 an error is returned to the caller.
Petko Manolov41c89b62015-12-02 17:47:55 +0200279
Dmitry Kasatkinfd5f4e902014-11-05 17:01:14 +0200280config IMA_LOAD_X509
281 bool "Load X509 certificate onto the '.ima' trusted keyring"
282 depends on IMA_TRUSTED_KEYRING
283 default n
284 help
285 File signature verification is based on the public keys
286 loaded on the .ima trusted keyring. These public keys are
287 X509 certificates signed by a trusted key on the
288 .system keyring. This option enables X509 certificate
289 loading from the kernel onto the '.ima' trusted keyring.
290
291config IMA_X509_PATH
292 string "IMA X509 certificate path"
293 depends on IMA_LOAD_X509
294 default "/etc/keys/x509_ima.der"
295 help
296 This option defines IMA X509 certificate path.
Dmitry Kasatkinc57782c2014-11-05 17:01:16 +0200297
298config IMA_APPRAISE_SIGNED_INIT
299 bool "Require signed user-space initialization"
300 depends on IMA_LOAD_X509
301 default n
302 help
303 This option requires user-space init to be signed.
Lakshmi Ramasubramanianea789792020-01-08 08:05:08 -0800304
305config IMA_MEASURE_ASYMMETRIC_KEYS
306 bool
307 depends on IMA
308 depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE=y
309 default y
Lakshmi Ramasubramanian9f81a2e2020-01-22 17:32:04 -0800310
311config IMA_QUEUE_EARLY_BOOT_KEYS
312 bool
313 depends on IMA_MEASURE_ASYMMETRIC_KEYS
314 depends on SYSTEM_TRUSTED_KEYRING
315 default y
Nayna Jain9e2b4be2020-03-08 20:57:51 -0400316
317config IMA_SECURE_AND_OR_TRUSTED_BOOT
318 bool
319 depends on IMA_ARCH_POLICY
320 help
321 This option is selected by architectures to enable secure and/or
322 trusted boot based on IMA runtime policies.
Tushar Sugandhi52c20832021-05-10 12:09:39 -0700323
324config IMA_DISABLE_HTABLE
325 bool "Disable htable to allow measurement of duplicate records"
326 depends on IMA
327 default n
328 help
329 This option disables htable to allow measurement of duplicate records.