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