[U-Boot] [PATCH 11/18] tpm: add TPM2_Clear command support
Miquel Raynal
miquel.raynal at bootlin.com
Thu Mar 8 15:40:14 UTC 2018
Add support for the TPM2_Clear command.
Change the command file and the help accordingly.
Signed-off-by: Miquel Raynal <miquel.raynal at bootlin.com>
---
cmd/tpm.c | 29 ++++++++++++++++++++++++++---
cmd/tpm_test.c | 6 +++---
include/tpm.h | 21 +++++++++++++++++----
lib/tpm.c | 42 ++++++++++++++++++++++++++++++++++++++----
4 files changed, 84 insertions(+), 14 deletions(-)
diff --git a/cmd/tpm.c b/cmd/tpm.c
index fc9ef9d4a3..32921e1a70 100644
--- a/cmd/tpm.c
+++ b/cmd/tpm.c
@@ -454,6 +454,29 @@ static int do_tpm_init(cmd_tbl_t *cmdtp, int flag,
return report_return_code(tpm_init());
}
+static int do_tpm_force_clear(cmd_tbl_t *cmdtp, int flag,
+ int argc, char * const argv[])
+{
+ u32 handle = 0;
+ const char *pw = (argc < 3) ? NULL : argv[2];
+ const ssize_t pw_sz = pw ? strlen(pw) : 0;
+
+ if (argc < 2 || argc > 3)
+ return CMD_RET_USAGE;
+
+ if (pw_sz > TPM2_DIGEST_LENGTH)
+ return -EINVAL;
+
+ if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1]))
+ handle = TPM2_RH_LOCKOUT;
+ else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1]))
+ handle = TPM2_RH_PLATFORM;
+ else
+ return CMD_RET_USAGE;
+
+ return report_return_code(tpm_force_clear(handle, pw, pw_sz));
+}
+
#define TPM_COMMAND_NO_ARG(cmd) \
static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \
int argc, char * const argv[]) \
@@ -465,7 +488,6 @@ static int do_##cmd(cmd_tbl_t *cmdtp, int flag, \
TPM_COMMAND_NO_ARG(tpm_self_test_full)
TPM_COMMAND_NO_ARG(tpm_continue_self_test)
-TPM_COMMAND_NO_ARG(tpm_force_clear)
TPM_COMMAND_NO_ARG(tpm_physical_enable)
TPM_COMMAND_NO_ARG(tpm_physical_disable)
@@ -951,8 +973,9 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
" physical_set_deactivated 0|1\n"
" - Set deactivated flag.\n"
"Admin Ownership Commands:\n"
-" force_clear\n"
-" - Issue TPM_ForceClear command.\n"
+" force_clear [<type>]\n"
+" - Issue TPM_[Force]Clear command, with <type> one of (TPMv2 only):\n"
+" * TPM2_RH_LOCKOUT, TPM2_RH_PLATFORM.\n"
" tsc_physical_presence flags\n"
" - Set TPM device's Physical Presence flags to <flags>.\n"
"The Capability Commands:\n"
diff --git a/cmd/tpm_test.c b/cmd/tpm_test.c
index 37ad2ff33d..da40dbc423 100644
--- a/cmd/tpm_test.c
+++ b/cmd/tpm_test.c
@@ -176,7 +176,7 @@ static int test_fast_enable(void)
TPM_CHECK(tpm_get_flags(&disable, &deactivated, NULL));
printf("\tdisable is %d, deactivated is %d\n", disable, deactivated);
for (i = 0; i < 2; i++) {
- TPM_CHECK(tpm_force_clear());
+ TPM_CHECK(tpm_force_clear(0, NULL, 0));
TPM_CHECK(tpm_get_flags(&disable, &deactivated, NULL));
printf("\tdisable is %d, deactivated is %d\n", disable,
deactivated);
@@ -458,7 +458,7 @@ static int test_write_limit(void)
TPM_CHECK(TlclStartupIfNeeded());
TPM_CHECK(tpm_self_test_full());
TPM_CHECK(tpm_tsc_physical_presence(PRESENCE));
- TPM_CHECK(tpm_force_clear());
+ TPM_CHECK(tpm_force_clear(0, NULL, 0));
TPM_CHECK(tpm_physical_enable());
TPM_CHECK(tpm_physical_set_deactivated(0));
@@ -477,7 +477,7 @@ static int test_write_limit(void)
}
/* Reset write count */
- TPM_CHECK(tpm_force_clear());
+ TPM_CHECK(tpm_force_clear(0, NULL, 0));
TPM_CHECK(tpm_physical_enable());
TPM_CHECK(tpm_physical_set_deactivated(0));
diff --git a/include/tpm.h b/include/tpm.h
index 38d7cb899d..2f17166662 100644
--- a/include/tpm.h
+++ b/include/tpm.h
@@ -43,13 +43,23 @@ enum tpm_startup_type {
};
enum tpm2_startup_types {
- TPM2_SU_CLEAR = 0x0000,
- TPM2_SU_STATE = 0x0001,
+ TPM2_SU_CLEAR = 0x0000,
+ TPM2_SU_STATE = 0x0001,
+};
+
+enum tpm2_handles {
+ TPM2_RH_OWNER = 0x40000001,
+ TPM2_RS_PW = 0x40000009,
+ TPM2_RH_LOCKOUT = 0x4000000A,
+ TPM2_RH_ENDORSEMENT = 0x4000000B,
+ TPM2_RH_PLATFORM = 0x4000000C,
};
enum tpm2_command_codes {
TPM2_CC_STARTUP = 0x0144,
TPM2_CC_SELF_TEST = 0x0143,
+ TPM2_CC_CLEAR = 0x0126,
+ TPM2_CC_CLEARCONTROL = 0x0127,
TPM2_CC_GET_CAPABILITY = 0x017A,
TPM2_CC_PCR_READ = 0x017E,
TPM2_CC_PCR_EXTEND = 0x0182,
@@ -567,11 +577,14 @@ uint32_t tpm_tsc_physical_presence(uint16_t presence);
uint32_t tpm_read_pubek(void *data, size_t count);
/**
- * Issue a TPM_ForceClear command.
+ * Issue a TPM_ForceClear or a TPM2_Clear command.
*
+ * @param handle Handle
+ * @param pw Password
+ * @param pw_sz Length of the password
* @return return code of the operation
*/
-uint32_t tpm_force_clear(void);
+int tpm_force_clear(u32 handle, const char *pw, const ssize_t pw_sz);
/**
* Issue a TPM_PhysicalEnable command.
diff --git a/lib/tpm.c b/lib/tpm.c
index 7b379b99aa..e5fb18308c 100644
--- a/lib/tpm.c
+++ b/lib/tpm.c
@@ -608,13 +608,47 @@ uint32_t tpm_read_pubek(void *data, size_t count)
return 0;
}
-uint32_t tpm_force_clear(void)
+int tpm_force_clear(u32 handle, const char *pw, const ssize_t pw_sz)
{
- const uint8_t command[10] = {
- 0x0, 0xc1, 0x0, 0x0, 0x0, 0xa, 0x0, 0x0, 0x0, 0x5d,
+ const u8 command_v1[10] = {
+ STRINGIFY16(0xc1),
+ STRINGIFY32(10),
+ STRINGIFY32(0x5d),
};
+ u8 command_v2[COMMAND_BUFFER_SIZE] = {
+ STRINGIFY16(TPM2_ST_SESSIONS), /* TAG */
+ STRINGIFY32(27 + pw_sz), /* Command size */
+ STRINGIFY32(TPM2_CC_CLEAR), /* Command code */
- return tpm_sendrecv_command(command, NULL, NULL);
+ /* HANDLE */
+ STRINGIFY32(handle), /* TPM resource handle */
+
+ /* AUTH_SESSION */
+ STRINGIFY32(9 + pw_sz), /* Authorization size */
+ STRINGIFY32(TPM2_RS_PW), /* Session handle */
+ STRINGIFY16(0), /* Size of <nonce> */
+ /* <nonce> (if any) */
+ 0, /* Attributes: Cont/Excl/Rst */
+ STRINGIFY16(pw_sz), /* Size of <hmac/password> */
+ /* STRING(pw) <hmac/password> (if any) */
+ };
+ unsigned int offset = 27;
+ int ret;
+
+ if (!is_tpmv2)
+ tpm_sendrecv_command(command_v1, NULL, NULL);
+
+ /*
+ * Fill the command structure starting from the first buffer:
+ * - the password (if any)
+ */
+ ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
+ offset, pw, pw_sz);
+ offset += pw_sz;
+ if (ret)
+ return TPM_LIB_ERROR;
+
+ return tpm_sendrecv_command(command_v2, NULL, NULL);
}
uint32_t tpm_physical_enable(void)
--
2.14.1
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