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