1tpm2_policycommandcode(1) General Commands Manual tpm2_policycommandcode(1)
2
6 tpm2_policycommandcode(1) - Restrict TPM object authorization to spe‐
7 cific TPM commands.
8
10 tpm2_policycommandcode [OPTIONS] [ARGUMENT]
11
13 tpm2_policycommandcode(1) - Restricts TPM object authorization to spe‐
14 cific TPM commands. Useful when you want to allow only specific com‐
15 mands to interact with the TPM object.
16 As an argument it takes the command as an integer or friendly string
18 value. Friendly string to COMMAND CODE mapping can be found in section
19 COMMAND CODE MAPPINGS.
20
22 · -S, --session=FILE:
23 A session file from tpm2_startauthsession(1)'s -S option.
25 · -L, --policy=FILE:
27 File to save the policy digest.
29 · ARGUMENT the command line argument specifies TPM2 command code.
31 References
34 This collection of options are common to many programs and provide in‐
35 formation that many users may expect.
36 · -h, --help=[man|no-man]: Display the tools manpage. By default, it
38 attempts to invoke the manpager for the tool, however, on failure
39 will output a short tool summary. This is the same behavior if the
40 "man" option argument is specified, however if explicit "man" is re‐
41 quested, the tool will provide errors from man on stderr. If the
42 "no-man" option if specified, or the manpager fails, the short op‐
43 tions will be output to stdout.
44 To successfully use the manpages feature requires the manpages to be
46 installed or on MANPATH, See man(1) for more details.
47 · -v, --version: Display version information for this tool, supported
49 tctis and exit.
50 · -V, --verbose: Increase the information that the tool prints to the
52 console during its execution. When using this option the file and
53 line number are printed.
54 · -Q, --quiet: Silence normal tool output to stdout.
56 · -Z, --enable-errata: Enable the application of errata fixups. Useful
58 if an errata fixup needs to be applied to commands sent to the TPM.
59 Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. in‐
60 formation many users may expect.
61
63 The TCTI or "Transmission Interface" is the communication mechanism
64 with the TPM. TCTIs can be changed for communication with TPMs across
65 different mediums.
66 To control the TCTI, the tools respect:
68 1. The command line option -T or --tcti
70 2. The environment variable: TPM2TOOLS_TCTI.
72 Note: The command line option always overrides the environment vari‐
74 able.
75 The current known TCTIs are:
77 · tabrmd - The resource manager, called tabrmd
79 (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and
80 abrmd as a tcti name are synonymous.
81 · mssim - Typically used for communicating to the TPM software simula‐
83 tor.
84 · device - Used when talking directly to a TPM device file.
86 · none - Do not initalize a connection with the TPM. Some tools allow
88 for off-tpm options and thus support not using a TCTI. Tools that do
89 not support it will error when attempted to be used without a TCTI
90 connection. Does not support ANY options and MUST BE presented as
91 the exact text of "none".
92 The arguments to either the command line option or the environment
94 variable are in the form:
95 <tcti-name>:<tcti-option-config>
97 Specifying an empty string for either the <tcti-name> or <tcti-op‐
99 tion-config> results in the default being used for that portion respec‐
100 tively.
101 TCTI Defaults
103 When a TCTI is not specified, the default TCTI is searched for using
104 dlopen(3) semantics. The tools will search for tabrmd, device and
105 mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query
106 what TCTI will be chosen as the default by using the -v option to print
107 the version information. The "default-tcti" key-value pair will indi‐
108 cate which of the aforementioned TCTIs is the default.
109 Custom TCTIs
111 Any TCTI that implements the dynamic TCTI interface can be loaded. The
112 tools internally use dlopen(3), and the raw tcti-name value is used for
113 the lookup. Thus, this could be a path to the shared library, or a li‐
114 brary name as understood by dlopen(3) semantics.
115
117 This collection of options are used to configure the various known TCTI
118 modules available:
119 · device: For the device TCTI, the TPM character device file for use by
121 the device TCTI can be specified. The default is /dev/tpm0.
122 Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI="de‐
124 vice:/dev/tpm0"
125 · mssim: For the mssim TCTI, the domain name or IP address and port
127 number used by the simulator can be specified. The default are
128 127.0.0.1 and 2321.
129 Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TC‐
131 TI="mssim:host=localhost,port=2321"
132 · abrmd: For the abrmd TCTI, the configuration string format is a se‐
134 ries of simple key value pairs separated by a ',' character. Each
135 key and value string are separated by a '=' character.
136 · TCTI abrmd supports two keys:
138 1. 'bus_name' : The name of the tabrmd service on the bus (a
140 string).
141 2. 'bus_type' : The type of the dbus instance (a string) limited to
143 'session' and 'system'.
144 Specify the tabrmd tcti name and a config string of bus_name=com.ex‐
146 ample.FooBar:
147 \--tcti=tabrmd:bus_name=com.example.FooBar
149 Specify the default (abrmd) tcti and a config string of bus_type=ses‐
151 sion:
152 \--tcti:bus_type=session
154 NOTE: abrmd and tabrmd are synonymous. the various known TCTI mod‐
156 ules.
157
159 The friendly strings below can be used en lieu of the raw integer val‐
160 ues.
161 -TPM2_CC_AC_GetCapability: 0x194 -TPM2_CC_AC_Send: 0x195 -TPM2_CC_Acti‐
163 vateCredential: 0x147 -TPM2_CC_Certify: 0x148 -TPM2_CC_CertifyCreation:
164 0x14a -TPM2_CC_ChangeEPS: 0x124 -TPM2_CC_ChangePPS: 0x125
165 -TPM2_CC_Clear: 0x126 -TPM2_CC_ClearControl: 0x127 -TPM2_CC_Clock‐
166 RateAdjust: 0x130 -TPM2_CC_ClockSet: 0x128 -TPM2_CC_Commit: 0x18b
167 -TPM2_CC_ContextLoad: 0x161 -TPM2_CC_ContextSave: 0x162 -TPM2_CC_Cre‐
168 ate: 0x153 -TPM2_CC_CreateLoaded: 0x191 -TPM2_CC_CreatePrimary: 0x131
169 -TPM2_CC_DictionaryAttackLockReset: 0x139 -TPM2_CC_DictionaryAttackPa‐
170 rameters: 0x13a -TPM2_CC_Duplicate: 0x14b -TPM2_CC_ECC_Parameters:
171 0x178 -TPM2_CC_ECDH_KeyGen: 0x163 -TPM2_CC_ECDH_ZGen: 0x154
172 -TPM2_CC_EC_Ephemeral: 0x18e -TPM2_CC_EncryptDecrypt: 0x164
173 -TPM2_CC_EncryptDecrypt2: 0x193 -TPM2_CC_EventSequenceComplete: 0x185
174 -TPM2_CC_EvictControl: 0x120 -TPM2_CC_FieldUpgradeData: 0x141
175 -TPM2_CC_FieldUpgradeStart: 0x12f -TPM2_CC_FirmwareRead: 0x179
176 -TPM2_CC_FlushContext: 0x165 -TPM2_CC_GetCapability: 0x17a
177 -TPM2_CC_GetCommandAuditDigest: 0x133 -TPM2_CC_GetRandom: 0x17b
178 -TPM2_CC_GetSessionAuditDigest: 0x14d -TPM2_CC_GetTestResult: 0x17c
179 -TPM2_CC_GetTime: 0x14c -TPM2_CC_Hash: 0x17d -TPM2_CC_HashSequenceS‐
180 tart: 0x186 -TPM2_CC_HierarchyChangeAuth: 0x129 -TPM2_CC_HierarchyCon‐
181 trol: 0x121 -TPM2_CC_HMAC: 0x155 -TPM2_CC_HMAC_Start: 0x15b
182 -TPM2_CC_Import: 0x156 -TPM2_CC_IncrementalSelfTest: 0x142
183 -TPM2_CC_Load: 0x157 -TPM2_CC_LoadExternal: 0x167 -TPM2_CC_MakeCreden‐
184 tial: 0x168 -TPM2_CC_NV_Certify: 0x184 -TPM2_CC_NV_ChangeAuth: 0x13b
185 -TPM2_CC_NV_DefineSpace: 0x12a -TPM2_CC_NV_Extend: 0x136
186 -TPM2_CC_NV_GlobalWriteLock: 0x132 -TPM2_CC_NV_Increment: 0x134
187 -TPM2_CC_NV_Read: 0x14e -TPM2_CC_NV_ReadLock: 0x14f -TPM2_CC_NV_Read‐
188 Public: 0x169 -TPM2_CC_NV_SetBits: 0x135 -TPM2_CC_NV_UndefineSpace:
189 0x122 -TPM2_CC_NV_UndefineSpaceSpecial: 0x11f -TPM2_CC_NV_Write: 0x137
190 -TPM2_CC_NV_WriteLock: 0x138 -TPM2_CC_ObjectChangeAuth: 0x150
191 -TPM2_CC_PCR_Allocate: 0x12b -TPM2_CC_PCR_Event: 0x13c -TPM2_CC_PCR_Ex‐
192 tend: 0x182 -TPM2_CC_PCR_Read: 0x17e -TPM2_CC_PCR_Reset: 0x13d
193 -TPM2_CC_PCR_SetAuthPolicy: 0x12c -TPM2_CC_PCR_SetAuthValue: 0x183
194 -TPM2_CC_Policy_AC_SendSelect: 0x196 -TPM2_CC_PolicyAuthorize: 0x16a
195 -TPM2_CC_PolicyAuthorizeNV: 0x192 -TPM2_CC_PolicyAuthValue: 0x16b
196 -TPM2_CC_PolicyCommandCode: 0x16c -TPM2_CC_PolicyCounterTimer: 0x16d
197 -TPM2_CC_PolicyCpHash: 0x16e -TPM2_CC_PolicyDuplicationSelect: 0x188
198 -TPM2_CC_PolicyGetDigest: 0x189 -TPM2_CC_PolicyLocality: 0x16f
199 -TPM2_CC_PolicyNameHash: 0x170 -TPM2_CC_PolicyNV: 0x149 -TPM2_CC_Poli‐
200 cyNvWritten: 0x18f -TPM2_CC_PolicyOR: 0x171 -TPM2_CC_PolicyPassword:
201 0x18c -TPM2_CC_PolicyPCR: 0x17f -TPM2_CC_PolicyPhysicalPresence: 0x187
202 -TPM2_CC_PolicyRestart: 0x180 -TPM2_CC_PolicySecret: 0x151
203 -TPM2_CC_PolicySigned: 0x160 -TPM2_CC_PolicyTemplate: 0x190
204 -TPM2_CC_PolicyTicket: 0x172 -TPM2_CC_PP_Commands: 0x12d
205 -TPM2_CC_Quote: 0x158 -TPM2_CC_ReadClock: 0x181 -TPM2_CC_ReadPublic:
206 0x173 -TPM2_CC_Rewrap: 0x152 -TPM2_CC_RSA_Decrypt: 0x159
207 -TPM2_CC_RSA_Encrypt: 0x174 -TPM2_CC_SelfTest: 0x143 -TPM2_CC_Sequence‐
208 Complete: 0x13e -TPM2_CC_SequenceUpdate: 0x15c -TPM2_CC_SetAlgorithm‐
209 Set: 0x13f -TPM2_CC_SetCommandCodeAuditStatus: 0x140 -TPM2_CC_SetPrima‐
210 ryPolicy: 0x12e -TPM2_CC_Shutdown: 0x145 -TPM2_CC_Sign: 0x15d
211 -TPM2_CC_StartAuthSession: 0x176 -TPM2_CC_Startup: 0x144 -TPM2_CC_Stir‐
212 Random: 0x146 -TPM2_CC_TestParms: 0x18a -TPM2_CC_Unseal: 0x15e
213 -TPM2_CC_Vendor_TCG_Test: 0x20000000 -TPM2_CC_VerifySignature: 0x177
214 -TPM2_CC_ZGen_2Phase: 0x18d
215
217 Start a policy session and extend it with a specific command like un‐
218 seal. Attempts to perform other operations would fail.
219 Create an unseal-only policy
221 tpm2_startauthsession -S session.dat
222 tpm2_policycommandcode -S session.dat -L policy.dat TPM2_CC_Unseal
224 tpm2_flushcontext session.dat
226 Create the object with unseal-only auth policy
228 tpm2_createprimary -C o -c prim.ctx
229 tpm2_create -C prim.ctx -u sealkey.pub -r sealkey.priv -L policy.dat \
231 -i- <<< "SEALED-SECRET"
232 Try unseal operation
234 tpm2_load -C prim.ctx -u sealkey.pub -r sealkey.priv -n sealkey.name \
235 -c sealkey.ctx
236 tpm2_startauthsession --policy-session -S session.dat
238 tpm2_policycommandcode -S session.dat -L policy.dat TPM2_CC_Unseal
240 tpm2_unseal -p session:session.dat -c sealkey.ctx
242 SEALED-SECRET
243 tpm2_flushcontext session.dat
245 Try any other operation
247 echo "Encrypt Me" > plain.txt
248 tpm2_encryptdecrypt plain.txt -o enc.txt -c sealkey.ctx plain.txt
250 ERROR: Esys_EncryptDecrypt2(0x12F) - tpm:error(2.0): authValue or authPolicy is
251 not available for selected entity
252
254 Tools can return any of the following codes:
255 · 0 - Success.
257 · 1 - General non-specific error.
259 · 2 - Options handling error.
261 · 3 - Authentication error.
263 · 4 - TCTI related error.
265 · 5 - Non supported scheme. Applicable to tpm2_testparams.
267
269 It expects a session to be already established via tpm2_startauthses‐
270 sion(1) and requires one of the following:
271 · direct device access
273 · extended session support with tpm2-abrmd.
275 Without it, most resource managers will not save session state between
277 command invocations.
278
280 Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
281
283 See the Mailing List (https://lists.01.org/mailman/listinfo/tpm2)
284tpm2-tools tpm2_policycommandcode(1)