lib: tpm: Add command to list resources

It is sometimes convenient to know how many and/or which resources are
currently loaded into a TPG, e.g. to test is a flush operation succeeded.

Hence, we add a command that lists the resources of a given type currently
loaded into the TPM.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
Reviewed-by: Simon Glass <sjg@chromium.org>

diff --git a/cmd/tpm.c b/cmd/tpm.c
index e3d26b7..0c4bc73 100644 (file)
--- a/cmd/tpm.c
+++ b/cmd/tpm.c
@@ -752,6 +752,68 @@ static int do_tpm_flush(cmd_tbl_t *cmdtp, int flag, int argc,
 }
 #endif /* CONFIG_TPM_FLUSH_RESOURCES */
 
+#ifdef CONFIG_TPM_LIST_RESOURCES
+static int do_tpm_list(cmd_tbl_t *cmdtp, int flag, int argc,
+                      char * const argv[])
+{
+       int type = 0;
+       uint16_t res_count;
+       uint8_t buf[288];
+       uint8_t *ptr;
+       int err;
+       uint i;
+
+       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 (!type) {
+               printf("Resource type %s unknown.\n", argv[1]);
+               return -1;
+       }
+
+       /* fetch list of already loaded resources in the TPM */
+       err = tpm_get_capability(TPM_CAP_HANDLE, type, buf,
+                                sizeof(buf));
+       if (err) {
+               printf("tpm_get_capability returned error %d.\n", err);
+               return -1;
+       }
+       res_count = get_unaligned_be16(buf);
+       ptr = buf + 2;
+
+       printf("Resources of type %s (%02x):\n", argv[1], type);
+       if (!res_count) {
+               puts("None\n");
+       } else {
+               for (i = 0; i < res_count; ++i, ptr += 4)
+                       printf("Index %d: %08x\n", i, get_unaligned_be32(ptr));
+       }
+
+       return 0;
+}
+#endif /* CONFIG_TPM_LIST_RESOURCES */
+
 #define MAKE_TPM_CMD_ENTRY(cmd) \
        U_BOOT_CMD_MKENT(cmd, 0, 1, do_tpm_ ## cmd, "", "")
 
@@ -815,6 +877,10 @@ static cmd_tbl_t tpm_commands[] = {
        U_BOOT_CMD_MKENT(flush, 0, 1,
                         do_tpm_flush, "", ""),
 #endif /* CONFIG_TPM_FLUSH_RESOURCES */
+#ifdef CONFIG_TPM_LIST_RESOURCES
+       U_BOOT_CMD_MKENT(list, 0, 1,
+                        do_tpm_list, "", ""),
+#endif /* CONFIG_TPM_LIST_RESOURCES */
 };
 
 static int do_tpm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
@@ -864,14 +930,22 @@ U_BOOT_CMD(tpm, CONFIG_SYS_MAXARGS, 1, do_tpm,
 "  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
+#if defined(CONFIG_TPM_FLUSH_RESOURCES) || defined(CONFIG_TPM_LIST_RESOURCES)
 "Resource management functions\n"
+#endif
+#ifdef CONFIG_TPM_FLUSH_RESOURCES
 "  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_LIST_RESOURCES
+"  list resource_type\n"
+"    - lists resources of type <resource_type> (may be one of key, auth,\n"
+"      hash, trans, context, counter, delegate, daa_tpm, daa_v0, daa_v1),\n"
+"      contained in the TPM.\n"
+#endif /* CONFIG_TPM_LIST_RESOURCES */
 #ifdef CONFIG_TPM_AUTH_SESSIONS
 "Storage functions\n"
 "  loadkey2_oiap parent_handle key_addr key_len usage_auth\n"

diff --git a/drivers/tpm/Kconfig b/drivers/tpm/Kconfig
index a54b6a9..2a64bc4 100644 (file)
--- a/drivers/tpm/Kconfig
+++ b/drivers/tpm/Kconfig
@@ -96,4 +96,11 @@ config TPM_LOAD_KEY_BY_SHA1
          Enable support to load keys into the TPM by identifying
          their parent via the public key's SHA1 hash.
          The functionality is available via the 'tpm' command as well.
+
+config TPM_LIST_RESOURCES
+       bool "Enable TPM resource listing support"
+       depends on TPM
+       help
+         Enable support to list specific resources (e.g. keys) within the TPM.
+         The functionality is available via the 'tpm' command as well.
 endmenu