1 # SPDX-License-Identifier: GPL-2.0-only 1 # SPDX-License-Identifier: GPL-2.0-only
2 # IBM Integrity Measurement Architecture 2 # IBM Integrity Measurement Architecture
3 # 3 #
4 config IMA 4 config IMA
5 bool "Integrity Measurement Architectu 5 bool "Integrity Measurement Architecture(IMA)"
6 select SECURITYFS 6 select SECURITYFS
7 select CRYPTO 7 select CRYPTO
8 select CRYPTO_HMAC 8 select CRYPTO_HMAC
>> 9 select CRYPTO_MD5
9 select CRYPTO_SHA1 10 select CRYPTO_SHA1
10 select CRYPTO_HASH_INFO 11 select CRYPTO_HASH_INFO
11 select SECURITY_PATH !! 12 select TCG_TPM if HAS_IOMEM && !UML
12 select TCG_TPM if HAS_IOMEM <<
13 select TCG_TIS if TCG_TPM && X86 13 select TCG_TIS if TCG_TPM && X86
14 select TCG_CRB if TCG_TPM && ACPI 14 select TCG_CRB if TCG_TPM && ACPI
15 select TCG_IBMVTPM if TCG_TPM && PPC_P 15 select TCG_IBMVTPM if TCG_TPM && PPC_PSERIES
16 select INTEGRITY_AUDIT if AUDIT 16 select INTEGRITY_AUDIT if AUDIT
17 help 17 help
18 The Trusted Computing Group(TCG) run 18 The Trusted Computing Group(TCG) runtime Integrity
19 Measurement Architecture(IMA) mainta 19 Measurement Architecture(IMA) maintains a list of hash
20 values of executables and other sens 20 values of executables and other sensitive system files,
21 as they are read or executed. If an 21 as they are read or executed. If an attacker manages
22 to change the contents of an importa 22 to change the contents of an important system file
23 being measured, we can tell. 23 being measured, we can tell.
24 24
25 If your system has a TPM chip, then 25 If your system has a TPM chip, then IMA also maintains
26 an aggregate integrity value over th 26 an aggregate integrity value over this list inside the
27 TPM hardware, so that the TPM can pr 27 TPM hardware, so that the TPM can prove to a third party
28 whether or not critical system files 28 whether or not critical system files have been modified.
29 Read <https://www.usenix.org/events/ 29 Read <https://www.usenix.org/events/sec04/tech/sailer.html>
30 to learn more about IMA. 30 to learn more about IMA.
31 If unsure, say N. 31 If unsure, say N.
32 32
33 if IMA <<
34 <<
35 config IMA_KEXEC 33 config IMA_KEXEC
36 bool "Enable carrying the IMA measurem 34 bool "Enable carrying the IMA measurement list across a soft boot"
37 depends on TCG_TPM && HAVE_IMA_KEXEC !! 35 depends on IMA && TCG_TPM && HAVE_IMA_KEXEC
38 default n 36 default n
39 help 37 help
40 TPM PCRs are only reset on a hard r 38 TPM PCRs are only reset on a hard reboot. In order to validate
41 a TPM's quote after a soft boot, th 39 a TPM's quote after a soft boot, the IMA measurement list of the
42 running kernel must be saved and re 40 running kernel must be saved and restored on boot.
43 41
44 Depending on the IMA policy, the me 42 Depending on the IMA policy, the measurement list can grow to
45 be very large. 43 be very large.
46 44
47 config IMA_MEASURE_PCR_IDX 45 config IMA_MEASURE_PCR_IDX
48 int 46 int
>> 47 depends on IMA
49 range 8 14 48 range 8 14
50 default 10 49 default 10
51 help 50 help
52 IMA_MEASURE_PCR_IDX determines the T 51 IMA_MEASURE_PCR_IDX determines the TPM PCR register index
53 that IMA uses to maintain the integr 52 that IMA uses to maintain the integrity aggregate of the
54 measurement list. If unsure, use th 53 measurement list. If unsure, use the default 10.
55 54
56 config IMA_LSM_RULES 55 config IMA_LSM_RULES
57 bool 56 bool
58 depends on AUDIT && (SECURITY_SELINUX !! 57 depends on IMA && AUDIT && (SECURITY_SELINUX || SECURITY_SMACK || SECURITY_APPARMOR)
59 default y 58 default y
60 help 59 help
61 Disabling this option will disregard 60 Disabling this option will disregard LSM based policy rules.
62 61
63 choice 62 choice
64 prompt "Default template" 63 prompt "Default template"
65 default IMA_NG_TEMPLATE 64 default IMA_NG_TEMPLATE
>> 65 depends on IMA
66 help 66 help
67 Select the default IMA measurement t 67 Select the default IMA measurement template.
68 68
69 The original 'ima' measurement list 69 The original 'ima' measurement list template contains a
70 hash, defined as 20 bytes, and a nul 70 hash, defined as 20 bytes, and a null terminated pathname,
71 limited to 255 characters. The 'ima 71 limited to 255 characters. The 'ima-ng' measurement list
72 template permits both larger hash di 72 template permits both larger hash digests and longer
73 pathnames. The configured default te !! 73 pathnames.
74 by specifying "ima_template=" on the <<
75 74
>> 75 config IMA_TEMPLATE
>> 76 bool "ima"
76 config IMA_NG_TEMPLATE 77 config IMA_NG_TEMPLATE
77 bool "ima-ng (default)" 78 bool "ima-ng (default)"
78 config IMA_SIG_TEMPLATE 79 config IMA_SIG_TEMPLATE
79 bool "ima-sig" 80 bool "ima-sig"
80 endchoice 81 endchoice
81 82
82 config IMA_DEFAULT_TEMPLATE 83 config IMA_DEFAULT_TEMPLATE
83 string 84 string
>> 85 depends on IMA
>> 86 default "ima" if IMA_TEMPLATE
84 default "ima-ng" if IMA_NG_TEMPLATE 87 default "ima-ng" if IMA_NG_TEMPLATE
85 default "ima-sig" if IMA_SIG_TEMPLATE 88 default "ima-sig" if IMA_SIG_TEMPLATE
86 89
87 choice 90 choice
88 prompt "Default integrity hash algorit 91 prompt "Default integrity hash algorithm"
89 default IMA_DEFAULT_HASH_SHA1 92 default IMA_DEFAULT_HASH_SHA1
>> 93 depends on IMA
90 help 94 help
91 Select the default hash algorithm u 95 Select the default hash algorithm used for the measurement
92 list, integrity appraisal and audit 96 list, integrity appraisal and audit log. The compiled default
93 hash algorithm can be overwritten u 97 hash algorithm can be overwritten using the kernel command
94 line 'ima_hash=' option. 98 line 'ima_hash=' option.
95 99
96 config IMA_DEFAULT_HASH_SHA1 100 config IMA_DEFAULT_HASH_SHA1
97 bool "SHA1 (default)" 101 bool "SHA1 (default)"
98 depends on CRYPTO_SHA1=y 102 depends on CRYPTO_SHA1=y
99 103
100 config IMA_DEFAULT_HASH_SHA256 104 config IMA_DEFAULT_HASH_SHA256
101 bool "SHA256" 105 bool "SHA256"
102 depends on CRYPTO_SHA256=y !! 106 depends on CRYPTO_SHA256=y && !IMA_TEMPLATE
103 107
104 config IMA_DEFAULT_HASH_SHA512 108 config IMA_DEFAULT_HASH_SHA512
105 bool "SHA512" 109 bool "SHA512"
106 depends on CRYPTO_SHA512=y !! 110 depends on CRYPTO_SHA512=y && !IMA_TEMPLATE
107 111
108 config IMA_DEFAULT_HASH_WP512 112 config IMA_DEFAULT_HASH_WP512
109 bool "WP512" 113 bool "WP512"
110 depends on CRYPTO_WP512=y !! 114 depends on CRYPTO_WP512=y && !IMA_TEMPLATE
111 115
112 config IMA_DEFAULT_HASH_SM3 116 config IMA_DEFAULT_HASH_SM3
113 bool "SM3" 117 bool "SM3"
114 depends on CRYPTO_SM3_GENERIC= !! 118 depends on CRYPTO_SM3=y && !IMA_TEMPLATE
115 endchoice 119 endchoice
116 120
117 config IMA_DEFAULT_HASH 121 config IMA_DEFAULT_HASH
118 string 122 string
>> 123 depends on IMA
119 default "sha1" if IMA_DEFAULT_HASH_SHA 124 default "sha1" if IMA_DEFAULT_HASH_SHA1
120 default "sha256" if IMA_DEFAULT_HASH_S 125 default "sha256" if IMA_DEFAULT_HASH_SHA256
121 default "sha512" if IMA_DEFAULT_HASH_S 126 default "sha512" if IMA_DEFAULT_HASH_SHA512
122 default "wp512" if IMA_DEFAULT_HASH_WP 127 default "wp512" if IMA_DEFAULT_HASH_WP512
123 default "sm3" if IMA_DEFAULT_HASH_SM3 128 default "sm3" if IMA_DEFAULT_HASH_SM3
124 129
125 config IMA_WRITE_POLICY 130 config IMA_WRITE_POLICY
126 bool "Enable multiple writes to the IM 131 bool "Enable multiple writes to the IMA policy"
>> 132 depends on IMA
127 default n 133 default n
128 help 134 help
129 IMA policy can now be updated multip 135 IMA policy can now be updated multiple times. The new rules get
130 appended to the original policy. Ha 136 appended to the original policy. Have in mind that the rules are
131 scanned in FIFO order so be careful 137 scanned in FIFO order so be careful when you design and add new ones.
132 138
133 If unsure, say N. 139 If unsure, say N.
134 140
135 config IMA_READ_POLICY 141 config IMA_READ_POLICY
136 bool "Enable reading back the current 142 bool "Enable reading back the current IMA policy"
>> 143 depends on IMA
137 default y if IMA_WRITE_POLICY 144 default y if IMA_WRITE_POLICY
138 default n if !IMA_WRITE_POLICY 145 default n if !IMA_WRITE_POLICY
139 help 146 help
140 It is often useful to be able to re 147 It is often useful to be able to read back the IMA policy. It is
141 even more important after introduci 148 even more important after introducing CONFIG_IMA_WRITE_POLICY.
142 This option allows the root user to 149 This option allows the root user to see the current policy rules.
143 150
144 config IMA_APPRAISE 151 config IMA_APPRAISE
145 bool "Appraise integrity measurements" 152 bool "Appraise integrity measurements"
>> 153 depends on IMA
146 default n 154 default n
147 help 155 help
148 This option enables local measuremen 156 This option enables local measurement integrity appraisal.
149 It requires the system to be labeled 157 It requires the system to be labeled with a security extended
150 attribute containing the file hash m 158 attribute containing the file hash measurement. To protect
151 the security extended attributes fro 159 the security extended attributes from offline attack, enable
152 and configure EVM. 160 and configure EVM.
153 161
154 For more information on integrity ap 162 For more information on integrity appraisal refer to:
155 <http://linux-ima.sourceforge.net> 163 <http://linux-ima.sourceforge.net>
156 If unsure, say N. 164 If unsure, say N.
157 165
158 config IMA_ARCH_POLICY 166 config IMA_ARCH_POLICY
159 bool "Enable loading an IMA architectu 167 bool "Enable loading an IMA architecture specific policy"
160 depends on (KEXEC_SIG && IMA) || IMA_A 168 depends on (KEXEC_SIG && IMA) || IMA_APPRAISE \
161 && INTEGRITY_ASYMMETRIC_KEY 169 && INTEGRITY_ASYMMETRIC_KEYS
162 default n 170 default n
163 help 171 help
164 This option enables loading an IMA a 172 This option enables loading an IMA architecture specific policy
165 based on run time secure boot flags. 173 based on run time secure boot flags.
166 174
167 config IMA_APPRAISE_BUILD_POLICY 175 config IMA_APPRAISE_BUILD_POLICY
168 bool "IMA build time configured policy 176 bool "IMA build time configured policy rules"
169 depends on IMA_APPRAISE && INTEGRITY_A 177 depends on IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS
170 default n 178 default n
171 help 179 help
172 This option defines an IMA appraisal 180 This option defines an IMA appraisal policy at build time, which
173 is enforced at run time without havi 181 is enforced at run time without having to specify a builtin
174 policy name on the boot command line 182 policy name on the boot command line. The build time appraisal
175 policy rules persist after loading a 183 policy rules persist after loading a custom policy.
176 184
177 Depending on the rules configured, t 185 Depending on the rules configured, this policy may require kernel
178 modules, firmware, the kexec kernel 186 modules, firmware, the kexec kernel image, and/or the IMA policy
179 to be signed. Unsigned files might 187 to be signed. Unsigned files might prevent the system from
180 booting or applications from working 188 booting or applications from working properly.
181 189
182 config IMA_APPRAISE_REQUIRE_FIRMWARE_SIGS 190 config IMA_APPRAISE_REQUIRE_FIRMWARE_SIGS
183 bool "Appraise firmware signatures" 191 bool "Appraise firmware signatures"
184 depends on IMA_APPRAISE_BUILD_POLICY 192 depends on IMA_APPRAISE_BUILD_POLICY
185 default n 193 default n
186 help 194 help
187 This option defines a policy requiri 195 This option defines a policy requiring all firmware to be signed,
188 including the regulatory.db. If bot 196 including the regulatory.db. If both this option and
189 CFG80211_REQUIRE_SIGNED_REGDB are en 197 CFG80211_REQUIRE_SIGNED_REGDB are enabled, then both signature
190 verification methods are necessary. 198 verification methods are necessary.
191 199
192 config IMA_APPRAISE_REQUIRE_KEXEC_SIGS 200 config IMA_APPRAISE_REQUIRE_KEXEC_SIGS
193 bool "Appraise kexec kernel image sign 201 bool "Appraise kexec kernel image signatures"
194 depends on IMA_APPRAISE_BUILD_POLICY 202 depends on IMA_APPRAISE_BUILD_POLICY
195 default n 203 default n
196 help 204 help
197 Enabling this rule will require all 205 Enabling this rule will require all kexec'ed kernel images to
198 be signed and verified by a public k 206 be signed and verified by a public key on the trusted IMA
199 keyring. 207 keyring.
200 208
201 Kernel image signatures can not be v 209 Kernel image signatures can not be verified by the original
202 kexec_load syscall. Enabling this r 210 kexec_load syscall. Enabling this rule will prevent its
203 usage. 211 usage.
204 212
205 config IMA_APPRAISE_REQUIRE_MODULE_SIGS 213 config IMA_APPRAISE_REQUIRE_MODULE_SIGS
206 bool "Appraise kernel modules signatur 214 bool "Appraise kernel modules signatures"
207 depends on IMA_APPRAISE_BUILD_POLICY 215 depends on IMA_APPRAISE_BUILD_POLICY
208 default n 216 default n
209 help 217 help
210 Enabling this rule will require all 218 Enabling this rule will require all kernel modules to be signed
211 and verified by a public key on the 219 and verified by a public key on the trusted IMA keyring.
212 220
213 Kernel module signatures can only be 221 Kernel module signatures can only be verified by IMA-appraisal,
214 via the finit_module syscall. Enabli 222 via the finit_module syscall. Enabling this rule will prevent
215 the usage of the init_module syscall 223 the usage of the init_module syscall.
216 224
217 config IMA_APPRAISE_REQUIRE_POLICY_SIGS 225 config IMA_APPRAISE_REQUIRE_POLICY_SIGS
218 bool "Appraise IMA policy signature" 226 bool "Appraise IMA policy signature"
219 depends on IMA_APPRAISE_BUILD_POLICY 227 depends on IMA_APPRAISE_BUILD_POLICY
220 default n 228 default n
221 help 229 help
222 Enabling this rule will require the 230 Enabling this rule will require the IMA policy to be signed and
223 and verified by a key on the trusted 231 and verified by a key on the trusted IMA keyring.
224 232
225 config IMA_APPRAISE_BOOTPARAM 233 config IMA_APPRAISE_BOOTPARAM
226 bool "ima_appraise boot parameter" 234 bool "ima_appraise boot parameter"
227 depends on IMA_APPRAISE 235 depends on IMA_APPRAISE
228 default y 236 default y
229 help 237 help
230 This option enables the different "i 238 This option enables the different "ima_appraise=" modes
231 (eg. fix, log) from the boot command 239 (eg. fix, log) from the boot command line.
232 240
233 config IMA_APPRAISE_MODSIG 241 config IMA_APPRAISE_MODSIG
234 bool "Support module-style signatures 242 bool "Support module-style signatures for appraisal"
235 depends on IMA_APPRAISE 243 depends on IMA_APPRAISE
236 depends on INTEGRITY_ASYMMETRIC_KEYS 244 depends on INTEGRITY_ASYMMETRIC_KEYS
237 select PKCS7_MESSAGE_PARSER 245 select PKCS7_MESSAGE_PARSER
238 select MODULE_SIG_FORMAT 246 select MODULE_SIG_FORMAT
239 default n 247 default n
240 help 248 help
241 Adds support for signatures appende 249 Adds support for signatures appended to files. The format of the
242 appended signature is the same used 250 appended signature is the same used for signed kernel modules.
243 The modsig keyword can be used in t 251 The modsig keyword can be used in the IMA policy to allow a hook
244 to accept such signatures. 252 to accept such signatures.
245 253
>> 254 config IMA_TRUSTED_KEYRING
>> 255 bool "Require all keys on the .ima keyring be signed (deprecated)"
>> 256 depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
>> 257 depends on INTEGRITY_ASYMMETRIC_KEYS
>> 258 select INTEGRITY_TRUSTED_KEYRING
>> 259 default y
>> 260 help
>> 261 This option requires that all keys added to the .ima
>> 262 keyring be signed by a key on the system trusted keyring.
>> 263
>> 264 This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
>> 265
246 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_O 266 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
247 bool "Permit keys validly signed by a !! 267 bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
248 depends on SYSTEM_TRUSTED_KEYRING 268 depends on SYSTEM_TRUSTED_KEYRING
249 depends on SECONDARY_TRUSTED_KEYRING 269 depends on SECONDARY_TRUSTED_KEYRING
250 depends on INTEGRITY_ASYMMETRIC_KEYS 270 depends on INTEGRITY_ASYMMETRIC_KEYS
251 select INTEGRITY_TRUSTED_KEYRING 271 select INTEGRITY_TRUSTED_KEYRING
252 default n 272 default n
253 help 273 help
254 Keys may be added to the IMA or IMA 274 Keys may be added to the IMA or IMA blacklist keyrings, if the
255 key is validly signed by a CA cert i !! 275 key is validly signed by a CA cert in the system built-in or
256 machine (if configured), or secondar !! 276 secondary trusted keyrings.
257 key must also have the digitalSignat <<
258 277
259 Intermediate keys between those the 278 Intermediate keys between those the kernel has compiled in and the
260 IMA keys to be added may be added to 279 IMA keys to be added may be added to the system secondary keyring,
261 provided they are validly signed by 280 provided they are validly signed by a key already resident in the
262 built-in, machine (if configured) or !! 281 built-in or secondary trusted keyrings.
263 282
264 config IMA_BLACKLIST_KEYRING 283 config IMA_BLACKLIST_KEYRING
265 bool "Create IMA machine owner blackli 284 bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
266 depends on SYSTEM_TRUSTED_KEYRING 285 depends on SYSTEM_TRUSTED_KEYRING
267 depends on INTEGRITY_TRUSTED_KEYRING !! 286 depends on IMA_TRUSTED_KEYRING
268 default n 287 default n
269 help 288 help
270 This option creates an IMA blacklis 289 This option creates an IMA blacklist keyring, which contains all
271 revoked IMA keys. It is consulted 290 revoked IMA keys. It is consulted before any other keyring. If
272 the search is successful the reques 291 the search is successful the requested operation is rejected and
273 an error is returned to the caller. 292 an error is returned to the caller.
274 293
275 config IMA_LOAD_X509 294 config IMA_LOAD_X509
276 bool "Load X509 certificate onto the ' 295 bool "Load X509 certificate onto the '.ima' trusted keyring"
277 depends on INTEGRITY_TRUSTED_KEYRING !! 296 depends on IMA_TRUSTED_KEYRING
278 default n 297 default n
279 help 298 help
280 File signature verification is base 299 File signature verification is based on the public keys
281 loaded on the .ima trusted keyring. 300 loaded on the .ima trusted keyring. These public keys are
282 X509 certificates signed by a trust 301 X509 certificates signed by a trusted key on the
283 .system keyring. This option enabl 302 .system keyring. This option enables X509 certificate
284 loading from the kernel onto the '. 303 loading from the kernel onto the '.ima' trusted keyring.
285 304
286 config IMA_X509_PATH 305 config IMA_X509_PATH
287 string "IMA X509 certificate path" 306 string "IMA X509 certificate path"
288 depends on IMA_LOAD_X509 307 depends on IMA_LOAD_X509
289 default "/etc/keys/x509_ima.der" 308 default "/etc/keys/x509_ima.der"
290 help 309 help
291 This option defines IMA X509 certif 310 This option defines IMA X509 certificate path.
292 311
293 config IMA_APPRAISE_SIGNED_INIT 312 config IMA_APPRAISE_SIGNED_INIT
294 bool "Require signed user-space initia 313 bool "Require signed user-space initialization"
295 depends on IMA_LOAD_X509 314 depends on IMA_LOAD_X509
296 default n 315 default n
297 help 316 help
298 This option requires user-space ini 317 This option requires user-space init to be signed.
299 318
300 config IMA_MEASURE_ASYMMETRIC_KEYS 319 config IMA_MEASURE_ASYMMETRIC_KEYS
301 bool 320 bool
>> 321 depends on IMA
302 depends on ASYMMETRIC_PUBLIC_KEY_SUBTY 322 depends on ASYMMETRIC_PUBLIC_KEY_SUBTYPE=y
303 default y 323 default y
304 324
305 config IMA_QUEUE_EARLY_BOOT_KEYS 325 config IMA_QUEUE_EARLY_BOOT_KEYS
306 bool 326 bool
307 depends on IMA_MEASURE_ASYMMETRIC_KEYS 327 depends on IMA_MEASURE_ASYMMETRIC_KEYS
308 depends on SYSTEM_TRUSTED_KEYRING 328 depends on SYSTEM_TRUSTED_KEYRING
309 default y 329 default y
310 330
311 config IMA_SECURE_AND_OR_TRUSTED_BOOT 331 config IMA_SECURE_AND_OR_TRUSTED_BOOT
312 bool 332 bool
313 depends on IMA_ARCH_POLICY 333 depends on IMA_ARCH_POLICY
314 help 334 help
315 This option is selected by architect 335 This option is selected by architectures to enable secure and/or
316 trusted boot based on IMA runtime po 336 trusted boot based on IMA runtime policies.
317 <<
318 config IMA_DISABLE_HTABLE <<
319 bool "Disable htable to allow measurem <<
320 default n <<
321 help <<
322 This option disables htable to allo <<
323 <<
324 endif <<
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