lib: tpm: Add command to flush resources
This patch adds a function to the TPM library, which allows U-Boot to
flush resources, e.g. keys, from the TPM.
Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Stefan Roese <sr@denx.de>
diff --git a/cmd/tpm.c b/cmd/tpm.c
index 312503f..625fc43 100644
--- a/cmd/tpm.c
+++ b/cmd/tpm.c
@@ -646,6 +646,64 @@
#endif /* CONFIG_TPM_AUTH_SESSIONS */
+#ifdef CONFIG_TPM_FLUSH_RESOURCES
+static int do_tpm_flush(cmd_tbl_t *cmdtp, int flag, int argc,
+ char * const argv[])
+{
+ int type = 0;
+
+ if (argc != 2)
+ return CMD_RET_USAGE;
+
+ if (strcasecmp(argv[1], "key"))
+ type = TPM_RT_KEY;
+ else if (strcasecmp(argv[1], "auth"))
+ type = TPM_RT_AUTH;
+ else if (strcasecmp(argv[1], "hash"))
+ type = TPM_RT_HASH;
+ else if (strcasecmp(argv[1], "trans"))
+ type = TPM_RT_TRANS;
+ else if (strcasecmp(argv[1], "context"))
+ type = TPM_RT_CONTEXT;
+ else if (strcasecmp(argv[1], "counter"))
+ type = TPM_RT_COUNTER;
+ else if (strcasecmp(argv[1], "delegate"))
+ type = TPM_RT_DELEGATE;
+ else if (strcasecmp(argv[1], "daa_tpm"))
+ type = TPM_RT_DAA_TPM;
+ else if (strcasecmp(argv[1], "daa_v0"))
+ type = TPM_RT_DAA_V0;
+ else if (strcasecmp(argv[1], "daa_v1"))
+ type = TPM_RT_DAA_V1;
+
+ if (strcasecmp(argv[2], "all")) {
+ uint16_t res_count;
+ uint8_t buf[288];
+ uint8_t *ptr;
+ int err;
+ uint i;
+
+ /* fetch list of already loaded resources in the TPM */
+ err = tpm_get_capability(TPM_CAP_HANDLE, type, buf,
+ sizeof(buf));
+ if (err)
+ return -1;
+ res_count = get_unaligned_be16(buf);
+ ptr = buf + 2;
+ for (i = 0; i < res_count; ++i, ptr += 4)
+ tpm_flush_specific(get_unaligned_be32(ptr), type);
+ } else {
+ uint32_t handle = simple_strtoul(argv[2], NULL, 0);
+
+ if (!handle)
+ return -1;
+ tpm_flush_specific(cpu_to_be32(handle), type);
+ }
+
+ return 0;
+}
+#endif /* CONFIG_TPM_FLUSH_RESOURCES */
+
#define MAKE_TPM_CMD_ENTRY(cmd) \
U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
@@ -701,6 +759,10 @@
U_BOOT_CMD_MKENT(get_pub_key_oiap, 0, 1,
do_tpm_get_pub_key_oiap, "", ""),
#endif /* CONFIG_TPM_AUTH_SESSIONS */
+#ifdef CONFIG_TPM_FLUSH_RESOURCES
+ U_BOOT_CMD_MKENT(flush, 0, 1,
+ do_tpm_flush, "", ""),
+#endif /* CONFIG_TPM_FLUSH_RESOURCES */
};
static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
@@ -750,6 +812,14 @@
" get_capability cap_area sub_cap addr count\n"
" - Read <count> bytes of TPM capability indexed by <cap_area> and\n"
" <sub_cap> to memory address <addr>.\n"
+#ifdef CONFIG_TPM_FLUSH_RESOURCES
+"Resource management functions\n"
+" flush resource_type id\n"
+" - flushes a resource of type <resource_type> (may be one of key, auth,\n"
+" hash, trans, context, counter, delegate, daa_tpm, daa_v0, daa_v1),\n"
+" and id <id> from the TPM. Use an <id> of \"all\" to flush all\n"
+" resources of that type.\n"
+#endif /* CONFIG_TPM_FLUSH_RESOURCES */
#ifdef CONFIG_TPM_AUTH_SESSIONS
"Storage functions\n"
" loadkey2_oiap parent_handle key_addr key_len usage_auth\n"