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 <http://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)
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 <<
112 config IMA_DEFAULT_HASH_SM3 <<
113 bool "SM3" <<
114 depends on CRYPTO_SM3_GENERIC= <<
115 endchoice 115 endchoice
116 116
117 config IMA_DEFAULT_HASH 117 config IMA_DEFAULT_HASH
118 string 118 string
>> 119 depends on IMA
119 default "sha1" if IMA_DEFAULT_HASH_SHA 120 default "sha1" if IMA_DEFAULT_HASH_SHA1
120 default "sha256" if IMA_DEFAULT_HASH_S 121 default "sha256" if IMA_DEFAULT_HASH_SHA256
121 default "sha512" if IMA_DEFAULT_HASH_S 122 default "sha512" if IMA_DEFAULT_HASH_SHA512
122 default "wp512" if IMA_DEFAULT_HASH_WP 123 default "wp512" if IMA_DEFAULT_HASH_WP512
123 default "sm3" if IMA_DEFAULT_HASH_SM3 <<
124 124
125 config IMA_WRITE_POLICY 125 config IMA_WRITE_POLICY
126 bool "Enable multiple writes to the IM 126 bool "Enable multiple writes to the IMA policy"
>> 127 depends on IMA
127 default n 128 default n
128 help 129 help
129 IMA policy can now be updated multip 130 IMA policy can now be updated multiple times. The new rules get
130 appended to the original policy. Ha 131 appended to the original policy. Have in mind that the rules are
131 scanned in FIFO order so be careful 132 scanned in FIFO order so be careful when you design and add new ones.
132 133
133 If unsure, say N. 134 If unsure, say N.
134 135
135 config IMA_READ_POLICY 136 config IMA_READ_POLICY
136 bool "Enable reading back the current 137 bool "Enable reading back the current IMA policy"
>> 138 depends on IMA
137 default y if IMA_WRITE_POLICY 139 default y if IMA_WRITE_POLICY
138 default n if !IMA_WRITE_POLICY 140 default n if !IMA_WRITE_POLICY
139 help 141 help
140 It is often useful to be able to re 142 It is often useful to be able to read back the IMA policy. It is
141 even more important after introduci 143 even more important after introducing CONFIG_IMA_WRITE_POLICY.
142 This option allows the root user to 144 This option allows the root user to see the current policy rules.
143 145
144 config IMA_APPRAISE 146 config IMA_APPRAISE
145 bool "Appraise integrity measurements" 147 bool "Appraise integrity measurements"
>> 148 depends on IMA
146 default n 149 default n
147 help 150 help
148 This option enables local measuremen 151 This option enables local measurement integrity appraisal.
149 It requires the system to be labeled 152 It requires the system to be labeled with a security extended
150 attribute containing the file hash m 153 attribute containing the file hash measurement. To protect
151 the security extended attributes fro 154 the security extended attributes from offline attack, enable
152 and configure EVM. 155 and configure EVM.
153 156
154 For more information on integrity ap 157 For more information on integrity appraisal refer to:
155 <http://linux-ima.sourceforge.net> 158 <http://linux-ima.sourceforge.net>
156 If unsure, say N. 159 If unsure, say N.
157 160
158 config IMA_ARCH_POLICY 161 config IMA_ARCH_POLICY
159 bool "Enable loading an IMA architectu 162 bool "Enable loading an IMA architecture specific policy"
160 depends on (KEXEC_SIG && IMA) || IMA_A 163 depends on (KEXEC_SIG && IMA) || IMA_APPRAISE \
161 && INTEGRITY_ASYMMETRIC_KEY 164 && INTEGRITY_ASYMMETRIC_KEYS
162 default n 165 default n
163 help 166 help
164 This option enables loading an IMA a 167 This option enables loading an IMA architecture specific policy
165 based on run time secure boot flags. 168 based on run time secure boot flags.
166 169
167 config IMA_APPRAISE_BUILD_POLICY 170 config IMA_APPRAISE_BUILD_POLICY
168 bool "IMA build time configured policy 171 bool "IMA build time configured policy rules"
169 depends on IMA_APPRAISE && INTEGRITY_A 172 depends on IMA_APPRAISE && INTEGRITY_ASYMMETRIC_KEYS
170 default n 173 default n
171 help 174 help
172 This option defines an IMA appraisal 175 This option defines an IMA appraisal policy at build time, which
173 is enforced at run time without havi 176 is enforced at run time without having to specify a builtin
174 policy name on the boot command line 177 policy name on the boot command line. The build time appraisal
175 policy rules persist after loading a 178 policy rules persist after loading a custom policy.
176 179
177 Depending on the rules configured, t 180 Depending on the rules configured, this policy may require kernel
178 modules, firmware, the kexec kernel 181 modules, firmware, the kexec kernel image, and/or the IMA policy
179 to be signed. Unsigned files might 182 to be signed. Unsigned files might prevent the system from
180 booting or applications from working 183 booting or applications from working properly.
181 184
182 config IMA_APPRAISE_REQUIRE_FIRMWARE_SIGS 185 config IMA_APPRAISE_REQUIRE_FIRMWARE_SIGS
183 bool "Appraise firmware signatures" 186 bool "Appraise firmware signatures"
184 depends on IMA_APPRAISE_BUILD_POLICY 187 depends on IMA_APPRAISE_BUILD_POLICY
185 default n 188 default n
186 help 189 help
187 This option defines a policy requiri 190 This option defines a policy requiring all firmware to be signed,
188 including the regulatory.db. If bot 191 including the regulatory.db. If both this option and
189 CFG80211_REQUIRE_SIGNED_REGDB are en 192 CFG80211_REQUIRE_SIGNED_REGDB are enabled, then both signature
190 verification methods are necessary. 193 verification methods are necessary.
191 194
192 config IMA_APPRAISE_REQUIRE_KEXEC_SIGS 195 config IMA_APPRAISE_REQUIRE_KEXEC_SIGS
193 bool "Appraise kexec kernel image sign 196 bool "Appraise kexec kernel image signatures"
194 depends on IMA_APPRAISE_BUILD_POLICY 197 depends on IMA_APPRAISE_BUILD_POLICY
195 default n 198 default n
196 help 199 help
197 Enabling this rule will require all 200 Enabling this rule will require all kexec'ed kernel images to
198 be signed and verified by a public k 201 be signed and verified by a public key on the trusted IMA
199 keyring. 202 keyring.
200 203
201 Kernel image signatures can not be v 204 Kernel image signatures can not be verified by the original
202 kexec_load syscall. Enabling this r 205 kexec_load syscall. Enabling this rule will prevent its
203 usage. 206 usage.
204 207
205 config IMA_APPRAISE_REQUIRE_MODULE_SIGS 208 config IMA_APPRAISE_REQUIRE_MODULE_SIGS
206 bool "Appraise kernel modules signatur 209 bool "Appraise kernel modules signatures"
207 depends on IMA_APPRAISE_BUILD_POLICY 210 depends on IMA_APPRAISE_BUILD_POLICY
208 default n 211 default n
209 help 212 help
210 Enabling this rule will require all 213 Enabling this rule will require all kernel modules to be signed
211 and verified by a public key on the 214 and verified by a public key on the trusted IMA keyring.
212 215
213 Kernel module signatures can only be 216 Kernel module signatures can only be verified by IMA-appraisal,
214 via the finit_module syscall. Enabli 217 via the finit_module syscall. Enabling this rule will prevent
215 the usage of the init_module syscall 218 the usage of the init_module syscall.
216 219
217 config IMA_APPRAISE_REQUIRE_POLICY_SIGS 220 config IMA_APPRAISE_REQUIRE_POLICY_SIGS
218 bool "Appraise IMA policy signature" 221 bool "Appraise IMA policy signature"
219 depends on IMA_APPRAISE_BUILD_POLICY 222 depends on IMA_APPRAISE_BUILD_POLICY
220 default n 223 default n
221 help 224 help
222 Enabling this rule will require the 225 Enabling this rule will require the IMA policy to be signed and
223 and verified by a key on the trusted 226 and verified by a key on the trusted IMA keyring.
224 227
225 config IMA_APPRAISE_BOOTPARAM 228 config IMA_APPRAISE_BOOTPARAM
226 bool "ima_appraise boot parameter" 229 bool "ima_appraise boot parameter"
227 depends on IMA_APPRAISE !! 230 depends on IMA_APPRAISE && !IMA_ARCH_POLICY
228 default y 231 default y
229 help 232 help
230 This option enables the different "i 233 This option enables the different "ima_appraise=" modes
231 (eg. fix, log) from the boot command 234 (eg. fix, log) from the boot command line.
232 235
233 config IMA_APPRAISE_MODSIG 236 config IMA_APPRAISE_MODSIG
234 bool "Support module-style signatures 237 bool "Support module-style signatures for appraisal"
235 depends on IMA_APPRAISE 238 depends on IMA_APPRAISE
236 depends on INTEGRITY_ASYMMETRIC_KEYS 239 depends on INTEGRITY_ASYMMETRIC_KEYS
237 select PKCS7_MESSAGE_PARSER 240 select PKCS7_MESSAGE_PARSER
238 select MODULE_SIG_FORMAT 241 select MODULE_SIG_FORMAT
239 default n 242 default n
240 help 243 help
241 Adds support for signatures appende 244 Adds support for signatures appended to files. The format of the
242 appended signature is the same used 245 appended signature is the same used for signed kernel modules.
243 The modsig keyword can be used in t 246 The modsig keyword can be used in the IMA policy to allow a hook
244 to accept such signatures. 247 to accept such signatures.
245 248
>> 249 config IMA_TRUSTED_KEYRING
>> 250 bool "Require all keys on the .ima keyring be signed (deprecated)"
>> 251 depends on IMA_APPRAISE && SYSTEM_TRUSTED_KEYRING
>> 252 depends on INTEGRITY_ASYMMETRIC_KEYS
>> 253 select INTEGRITY_TRUSTED_KEYRING
>> 254 default y
>> 255 help
>> 256 This option requires that all keys added to the .ima
>> 257 keyring be signed by a key on the system trusted keyring.
>> 258
>> 259 This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
>> 260
246 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_O 261 config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY
247 bool "Permit keys validly signed by a !! 262 bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)"
248 depends on SYSTEM_TRUSTED_KEYRING 263 depends on SYSTEM_TRUSTED_KEYRING
249 depends on SECONDARY_TRUSTED_KEYRING 264 depends on SECONDARY_TRUSTED_KEYRING
250 depends on INTEGRITY_ASYMMETRIC_KEYS 265 depends on INTEGRITY_ASYMMETRIC_KEYS
251 select INTEGRITY_TRUSTED_KEYRING 266 select INTEGRITY_TRUSTED_KEYRING
252 default n 267 default n
253 help 268 help
254 Keys may be added to the IMA or IMA 269 Keys may be added to the IMA or IMA blacklist keyrings, if the
255 key is validly signed by a CA cert i !! 270 key is validly signed by a CA cert in the system built-in or
256 machine (if configured), or secondar !! 271 secondary trusted keyrings.
257 key must also have the digitalSignat <<
258 272
259 Intermediate keys between those the 273 Intermediate keys between those the kernel has compiled in and the
260 IMA keys to be added may be added to 274 IMA keys to be added may be added to the system secondary keyring,
261 provided they are validly signed by 275 provided they are validly signed by a key already resident in the
262 built-in, machine (if configured) or !! 276 built-in or secondary trusted keyrings.
263 277
264 config IMA_BLACKLIST_KEYRING 278 config IMA_BLACKLIST_KEYRING
265 bool "Create IMA machine owner blackli 279 bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)"
266 depends on SYSTEM_TRUSTED_KEYRING 280 depends on SYSTEM_TRUSTED_KEYRING
267 depends on INTEGRITY_TRUSTED_KEYRING !! 281 depends on IMA_TRUSTED_KEYRING
268 default n 282 default n
269 help 283 help
270 This option creates an IMA blacklis 284 This option creates an IMA blacklist keyring, which contains all
271 revoked IMA keys. It is consulted 285 revoked IMA keys. It is consulted before any other keyring. If
272 the search is successful the reques 286 the search is successful the requested operation is rejected and
273 an error is returned to the caller. 287 an error is returned to the caller.
274 288
275 config IMA_LOAD_X509 289 config IMA_LOAD_X509
276 bool "Load X509 certificate onto the ' 290 bool "Load X509 certificate onto the '.ima' trusted keyring"
277 depends on INTEGRITY_TRUSTED_KEYRING !! 291 depends on IMA_TRUSTED_KEYRING
278 default n 292 default n
279 help 293 help
280 File signature verification is base 294 File signature verification is based on the public keys
281 loaded on the .ima trusted keyring. 295 loaded on the .ima trusted keyring. These public keys are
282 X509 certificates signed by a trust 296 X509 certificates signed by a trusted key on the
283 .system keyring. This option enabl 297 .system keyring. This option enables X509 certificate
284 loading from the kernel onto the '. 298 loading from the kernel onto the '.ima' trusted keyring.
285 299
286 config IMA_X509_PATH 300 config IMA_X509_PATH
287 string "IMA X509 certificate path" 301 string "IMA X509 certificate path"
288 depends on IMA_LOAD_X509 302 depends on IMA_LOAD_X509
289 default "/etc/keys/x509_ima.der" 303 default "/etc/keys/x509_ima.der"
290 help 304 help
291 This option defines IMA X509 certif 305 This option defines IMA X509 certificate path.
292 306
293 config IMA_APPRAISE_SIGNED_INIT 307 config IMA_APPRAISE_SIGNED_INIT
294 bool "Require signed user-space initia 308 bool "Require signed user-space initialization"
295 depends on IMA_LOAD_X509 309 depends on IMA_LOAD_X509
296 default n 310 default n
297 help 311 help
298 This option requires user-space ini 312 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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