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![Miquel Raynal](/assets/img/avatar_default.png)
The recv variable in sandbox_tpm2_fill_buf() is a pointer on a pointer of a char array. It means accessing *recv is the char array pointer itself while **recv is the first character of that array. There is no need for such indirection here, so simplify the code. Simplifying things will make the last assignment right: "*recv = NULL" is now correct. The issue has been found by the following Coverity Scan report: CID 183371: Incorrect expression (UNUSED_VALUE) Assigning value "4UL" to "*recv" here, but that stored value is overwritten before it can be used. 232 *recv += sizeof(rc); 233 234 /* Add trailing \0 */ 235 *recv = NULL; While at simplifying things, use '\0' instead of NULL when adding an empty char at the end of the buffer. Reported-by: Tom Rini <trini@konsulko.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Reviewed-by: Simon Glass <sjg@chromium.org>
629 lines
14 KiB
C
629 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2018, Bootlin
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* Author: Miquel Raynal <miquel.raynal@bootlin.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <tpm-v2.h>
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#include <asm/state.h>
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#include <asm/unaligned.h>
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#include <linux/crc8.h>
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/* Hierarchies */
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enum tpm2_hierarchy {
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TPM2_HIERARCHY_LOCKOUT = 0,
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TPM2_HIERARCHY_ENDORSEMENT,
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TPM2_HIERARCHY_PLATFORM,
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TPM2_HIERARCHY_NB,
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};
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/* Subset of supported capabilities */
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enum tpm2_capability {
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TPM_CAP_TPM_PROPERTIES = 0x6,
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};
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/* Subset of supported properties */
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#define TPM2_PROPERTIES_OFFSET 0x0000020E
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enum tpm2_cap_tpm_property {
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TPM2_FAIL_COUNTER = 0,
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TPM2_PROP_MAX_TRIES,
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TPM2_RECOVERY_TIME,
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TPM2_LOCKOUT_RECOVERY,
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TPM2_PROPERTY_NB,
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};
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#define SANDBOX_TPM_PCR_NB 1
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static const u8 sandbox_extended_once_pcr[] = {
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0xf5, 0xa5, 0xfd, 0x42, 0xd1, 0x6a, 0x20, 0x30,
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0x27, 0x98, 0xef, 0x6e, 0xd3, 0x09, 0x97, 0x9b,
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0x43, 0x00, 0x3d, 0x23, 0x20, 0xd9, 0xf0, 0xe8,
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0xea, 0x98, 0x31, 0xa9, 0x27, 0x59, 0xfb, 0x4b,
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};
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struct sandbox_tpm2 {
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/* TPM internal states */
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bool init_done;
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bool startup_done;
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bool tests_done;
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/* TPM password per hierarchy */
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char pw[TPM2_HIERARCHY_NB][TPM2_DIGEST_LEN + 1];
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int pw_sz[TPM2_HIERARCHY_NB];
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/* TPM properties */
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u32 properties[TPM2_PROPERTY_NB];
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/* TPM PCRs */
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u8 pcr[SANDBOX_TPM_PCR_NB][TPM2_DIGEST_LEN];
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/* TPM PCR extensions */
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u32 pcr_extensions[SANDBOX_TPM_PCR_NB];
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};
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/*
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* Check the tag validity depending on the command (authentication required or
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* not). If authentication is required, check it is valid. Update the auth
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* pointer to point to the next chunk of data to process if needed.
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*/
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static int sandbox_tpm2_check_session(struct udevice *dev, u32 command, u16 tag,
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const u8 **auth,
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enum tpm2_hierarchy *hierarchy)
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{
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struct sandbox_tpm2 *tpm = dev_get_priv(dev);
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u32 handle, auth_sz, session_handle;
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u16 nonce_sz, pw_sz;
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const char *pw;
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switch (command) {
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case TPM2_CC_STARTUP:
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case TPM2_CC_SELF_TEST:
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case TPM2_CC_GET_CAPABILITY:
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case TPM2_CC_PCR_READ:
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if (tag != TPM2_ST_NO_SESSIONS) {
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printf("No session required for command 0x%x\n",
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command);
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return TPM2_RC_BAD_TAG;
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}
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return 0;
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case TPM2_CC_CLEAR:
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case TPM2_CC_HIERCHANGEAUTH:
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case TPM2_CC_DAM_RESET:
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case TPM2_CC_DAM_PARAMETERS:
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case TPM2_CC_PCR_EXTEND:
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if (tag != TPM2_ST_SESSIONS) {
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printf("Session required for command 0x%x\n", command);
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return TPM2_RC_AUTH_CONTEXT;
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}
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handle = get_unaligned_be32(*auth);
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*auth += sizeof(handle);
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/*
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* PCR_Extend had a different protection mechanism and does not
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* use the same standards as other commands.
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*/
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if (command == TPM2_CC_PCR_EXTEND)
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break;
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switch (handle) {
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case TPM2_RH_LOCKOUT:
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*hierarchy = TPM2_HIERARCHY_LOCKOUT;
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break;
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case TPM2_RH_ENDORSEMENT:
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if (command == TPM2_CC_CLEAR) {
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printf("Endorsement hierarchy unsupported\n");
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return TPM2_RC_AUTH_MISSING;
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}
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*hierarchy = TPM2_HIERARCHY_ENDORSEMENT;
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break;
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case TPM2_RH_PLATFORM:
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*hierarchy = TPM2_HIERARCHY_PLATFORM;
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break;
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default:
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printf("Wrong handle 0x%x\n", handle);
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return TPM2_RC_VALUE;
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}
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break;
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default:
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printf("Command code not recognized: 0x%x\n", command);
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return TPM2_RC_COMMAND_CODE;
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}
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auth_sz = get_unaligned_be32(*auth);
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*auth += sizeof(auth_sz);
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session_handle = get_unaligned_be32(*auth);
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*auth += sizeof(session_handle);
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if (session_handle != TPM2_RS_PW) {
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printf("Wrong session handle 0x%x\n", session_handle);
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return TPM2_RC_VALUE;
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}
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nonce_sz = get_unaligned_be16(*auth);
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*auth += sizeof(nonce_sz);
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if (nonce_sz) {
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printf("Nonces not supported in Sandbox, aborting\n");
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return TPM2_RC_HANDLE;
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}
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/* Ignore attributes */
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*auth += sizeof(u8);
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pw_sz = get_unaligned_be16(*auth);
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*auth += sizeof(pw_sz);
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if (auth_sz != (9 + nonce_sz + pw_sz)) {
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printf("Authentication size (%d) do not match %d\n",
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auth_sz, 9 + nonce_sz + pw_sz);
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return TPM2_RC_SIZE;
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}
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/* No passwork is acceptable */
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if (!pw_sz && !tpm->pw_sz[*hierarchy])
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return TPM2_RC_SUCCESS;
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/* Password is too long */
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if (pw_sz > TPM2_DIGEST_LEN) {
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printf("Password should not be more than %dB\n",
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TPM2_DIGEST_LEN);
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return TPM2_RC_AUTHSIZE;
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}
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pw = (const char *)*auth;
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*auth += pw_sz;
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/* Password is wrong */
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if (pw_sz != tpm->pw_sz[*hierarchy] ||
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strncmp(pw, tpm->pw[*hierarchy], tpm->pw_sz[*hierarchy])) {
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printf("Authentication failed: wrong password.\n");
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return TPM2_RC_BAD_AUTH;
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}
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return TPM2_RC_SUCCESS;
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}
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static int sandbox_tpm2_check_readyness(struct udevice *dev, int command)
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{
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struct sandbox_tpm2 *tpm = dev_get_priv(dev);
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switch (command) {
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case TPM2_CC_STARTUP:
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if (!tpm->init_done || tpm->startup_done)
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return TPM2_RC_INITIALIZE;
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break;
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case TPM2_CC_GET_CAPABILITY:
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if (!tpm->init_done || !tpm->startup_done)
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return TPM2_RC_INITIALIZE;
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break;
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case TPM2_CC_SELF_TEST:
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if (!tpm->startup_done)
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return TPM2_RC_INITIALIZE;
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break;
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default:
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if (!tpm->tests_done)
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return TPM2_RC_NEEDS_TEST;
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break;
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}
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return 0;
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}
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static int sandbox_tpm2_fill_buf(u8 *recv, size_t *recv_len, u16 tag, u32 rc)
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{
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*recv_len = sizeof(tag) + sizeof(u32) + sizeof(rc);
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/* Write tag */
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put_unaligned_be16(tag, recv);
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recv += sizeof(tag);
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/* Write length */
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put_unaligned_be32(*recv_len, recv);
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recv += sizeof(u32);
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/* Write return code */
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put_unaligned_be32(rc, recv);
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recv += sizeof(rc);
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/* Add trailing \0 */
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*recv = '\0';
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return 0;
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}
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static int sandbox_tpm2_extend(struct udevice *dev, int pcr_index,
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const u8 *extension)
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{
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struct sandbox_tpm2 *tpm = dev_get_priv(dev);
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int i;
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/* Only simulate the first extensions from all '0' with only '0' */
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for (i = 0; i < TPM2_DIGEST_LEN; i++)
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if (tpm->pcr[pcr_index][i] || extension[i])
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return TPM2_RC_FAILURE;
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memcpy(tpm->pcr[pcr_index], sandbox_extended_once_pcr,
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TPM2_DIGEST_LEN);
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tpm->pcr_extensions[pcr_index]++;
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return 0;
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};
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static int sandbox_tpm2_xfer(struct udevice *dev, const u8 *sendbuf,
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size_t send_size, u8 *recvbuf,
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size_t *recv_len)
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{
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struct sandbox_tpm2 *tpm = dev_get_priv(dev);
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enum tpm2_hierarchy hierarchy = 0;
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const u8 *sent = sendbuf;
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u8 *recv = recvbuf;
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u32 length, command, rc = 0;
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u16 tag, mode, new_pw_sz;
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u8 yes_no;
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int i, j;
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/* TPM2_GetProperty */
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u32 capability, property, property_count;
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/* TPM2_PCR_Read/Extend variables */
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int pcr_index = 0;
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u64 pcr_map = 0;
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u32 selections, pcr_nb;
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u16 alg;
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u8 pcr_array_sz;
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tag = get_unaligned_be16(sent);
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sent += sizeof(tag);
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length = get_unaligned_be32(sent);
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sent += sizeof(length);
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if (length != send_size) {
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printf("TPM2: Unmatching length, received: %ld, expected: %d\n",
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send_size, length);
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rc = TPM2_RC_SIZE;
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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return 0;
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}
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command = get_unaligned_be32(sent);
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sent += sizeof(command);
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rc = sandbox_tpm2_check_readyness(dev, command);
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if (rc) {
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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return 0;
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}
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rc = sandbox_tpm2_check_session(dev, command, tag, &sent, &hierarchy);
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if (rc) {
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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return 0;
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}
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switch (command) {
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case TPM2_CC_STARTUP:
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mode = get_unaligned_be16(sent);
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sent += sizeof(mode);
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switch (mode) {
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case TPM2_SU_CLEAR:
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case TPM2_SU_STATE:
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break;
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default:
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rc = TPM2_RC_VALUE;
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}
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tpm->startup_done = true;
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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break;
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case TPM2_CC_SELF_TEST:
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yes_no = *sent;
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sent += sizeof(yes_no);
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switch (yes_no) {
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case TPMI_YES:
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case TPMI_NO:
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break;
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default:
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rc = TPM2_RC_VALUE;
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}
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tpm->tests_done = true;
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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break;
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case TPM2_CC_CLEAR:
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/* Reset this hierarchy password */
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tpm->pw_sz[hierarchy] = 0;
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/* Reset all password if thisis the PLATFORM hierarchy */
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if (hierarchy == TPM2_HIERARCHY_PLATFORM)
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for (i = 0; i < TPM2_HIERARCHY_NB; i++)
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tpm->pw_sz[i] = 0;
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/* Reset the properties */
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for (i = 0; i < TPM2_PROPERTY_NB; i++)
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tpm->properties[i] = 0;
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/* Reset the PCRs and their number of extensions */
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for (i = 0; i < SANDBOX_TPM_PCR_NB; i++) {
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tpm->pcr_extensions[i] = 0;
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for (j = 0; j < TPM2_DIGEST_LEN; j++)
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tpm->pcr[i][j] = 0;
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}
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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break;
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case TPM2_CC_HIERCHANGEAUTH:
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new_pw_sz = get_unaligned_be16(sent);
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sent += sizeof(new_pw_sz);
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if (new_pw_sz > TPM2_DIGEST_LEN) {
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rc = TPM2_RC_SIZE;
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} else if (new_pw_sz) {
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tpm->pw_sz[hierarchy] = new_pw_sz;
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memcpy(tpm->pw[hierarchy], sent, new_pw_sz);
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sent += new_pw_sz;
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}
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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break;
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case TPM2_CC_GET_CAPABILITY:
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capability = get_unaligned_be32(sent);
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sent += sizeof(capability);
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if (capability != TPM_CAP_TPM_PROPERTIES) {
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printf("Sandbox TPM only support TPM_CAPABILITIES\n");
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return TPM2_RC_HANDLE;
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}
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property = get_unaligned_be32(sent);
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sent += sizeof(property);
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property -= TPM2_PROPERTIES_OFFSET;
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property_count = get_unaligned_be32(sent);
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sent += sizeof(property_count);
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if (!property_count ||
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property + property_count > TPM2_PROPERTY_NB) {
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rc = TPM2_RC_HANDLE;
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return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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}
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/* Write tag */
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put_unaligned_be16(tag, recv);
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recv += sizeof(tag);
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/* Ignore length for now */
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recv += sizeof(u32);
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/* Write return code */
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put_unaligned_be32(rc, recv);
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recv += sizeof(rc);
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/* Tell there is more data to read */
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*recv = TPMI_YES;
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recv += sizeof(yes_no);
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/* Repeat the capability */
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put_unaligned_be32(capability, recv);
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recv += sizeof(capability);
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/* Give the number of properties that follow */
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put_unaligned_be32(property_count, recv);
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recv += sizeof(property_count);
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/* Fill with the properties */
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for (i = 0; i < property_count; i++) {
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put_unaligned_be32(TPM2_PROPERTIES_OFFSET + property +
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i, recv);
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recv += sizeof(property);
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put_unaligned_be32(tpm->properties[property + i],
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recv);
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recv += sizeof(property);
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}
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/* Add trailing \0 */
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*recv = '\0';
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/* Write response length */
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*recv_len = recv - recvbuf;
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put_unaligned_be32(*recv_len, recvbuf + sizeof(tag));
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break;
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case TPM2_CC_DAM_PARAMETERS:
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tpm->properties[TPM2_PROP_MAX_TRIES] = get_unaligned_be32(sent);
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sent += sizeof(*tpm->properties);
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tpm->properties[TPM2_RECOVERY_TIME] = get_unaligned_be32(sent);
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sent += sizeof(*tpm->properties);
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tpm->properties[TPM2_LOCKOUT_RECOVERY] = get_unaligned_be32(sent);
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sent += sizeof(*tpm->properties);
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sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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break;
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case TPM2_CC_PCR_READ:
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selections = get_unaligned_be32(sent);
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sent += sizeof(selections);
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if (selections != 1) {
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printf("Sandbox cannot handle more than one PCR\n");
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rc = TPM2_RC_VALUE;
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return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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}
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alg = get_unaligned_be16(sent);
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sent += sizeof(alg);
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if (alg != TPM2_ALG_SHA256) {
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printf("Sandbox TPM only handle SHA256 algorithm\n");
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rc = TPM2_RC_VALUE;
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return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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}
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pcr_array_sz = *sent;
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sent += sizeof(pcr_array_sz);
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if (!pcr_array_sz || pcr_array_sz > 8) {
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printf("Sandbox TPM cannot handle so much PCRs\n");
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rc = TPM2_RC_VALUE;
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return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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}
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for (i = 0; i < pcr_array_sz; i++)
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pcr_map += (u64)sent[i] << (i * 8);
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if (pcr_map >> SANDBOX_TPM_PCR_NB) {
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printf("Sandbox TPM handles up to %d PCR(s)\n",
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SANDBOX_TPM_PCR_NB);
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rc = TPM2_RC_VALUE;
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return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
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}
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|
|
if (!pcr_map) {
|
|
printf("Empty PCR map.\n");
|
|
rc = TPM2_RC_VALUE;
|
|
return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
|
|
}
|
|
|
|
for (i = 0; i < SANDBOX_TPM_PCR_NB; i++)
|
|
if (pcr_map & BIT(i))
|
|
pcr_index = i;
|
|
|
|
/* Write tag */
|
|
put_unaligned_be16(tag, recv);
|
|
recv += sizeof(tag);
|
|
|
|
/* Ignore length for now */
|
|
recv += sizeof(u32);
|
|
|
|
/* Write return code */
|
|
put_unaligned_be32(rc, recv);
|
|
recv += sizeof(rc);
|
|
|
|
/* Number of extensions */
|
|
put_unaligned_be32(tpm->pcr_extensions[pcr_index], recv);
|
|
recv += sizeof(u32);
|
|
|
|
/* Copy the PCR */
|
|
memcpy(recv, tpm->pcr[pcr_index], TPM2_DIGEST_LEN);
|
|
recv += TPM2_DIGEST_LEN;
|
|
|
|
/* Add trailing \0 */
|
|
*recv = '\0';
|
|
|
|
/* Write response length */
|
|
*recv_len = recv - recvbuf;
|
|
put_unaligned_be32(*recv_len, recvbuf + sizeof(tag));
|
|
|
|
break;
|
|
|
|
case TPM2_CC_PCR_EXTEND:
|
|
/* Get the PCR index */
|
|
pcr_index = get_unaligned_be32(sendbuf + sizeof(tag) +
|
|
sizeof(length) +
|
|
sizeof(command));
|
|
if (pcr_index > SANDBOX_TPM_PCR_NB) {
|
|
printf("Sandbox TPM handles up to %d PCR(s)\n",
|
|
SANDBOX_TPM_PCR_NB);
|
|
rc = TPM2_RC_VALUE;
|
|
}
|
|
|
|
/* Check the number of hashes */
|
|
pcr_nb = get_unaligned_be32(sent);
|
|
sent += sizeof(pcr_nb);
|
|
if (pcr_nb != 1) {
|
|
printf("Sandbox cannot handle more than one PCR\n");
|
|
rc = TPM2_RC_VALUE;
|
|
return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
|
|
}
|
|
|
|
/* Check the hash algorithm */
|
|
alg = get_unaligned_be16(sent);
|
|
sent += sizeof(alg);
|
|
if (alg != TPM2_ALG_SHA256) {
|
|
printf("Sandbox TPM only handle SHA256 algorithm\n");
|
|
rc = TPM2_RC_VALUE;
|
|
return sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
|
|
}
|
|
|
|
/* Extend the PCR */
|
|
rc = sandbox_tpm2_extend(dev, pcr_index, sent);
|
|
|
|
sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
|
|
break;
|
|
|
|
default:
|
|
printf("TPM2 command %02x unknown in Sandbox\n", command);
|
|
rc = TPM2_RC_COMMAND_CODE;
|
|
sandbox_tpm2_fill_buf(recv, recv_len, tag, rc);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_tpm2_get_desc(struct udevice *dev, char *buf, int size)
|
|
{
|
|
if (size < 15)
|
|
return -ENOSPC;
|
|
|
|
return snprintf(buf, size, "Sandbox TPM2.x");
|
|
}
|
|
|
|
static int sandbox_tpm2_open(struct udevice *dev)
|
|
{
|
|
struct sandbox_tpm2 *tpm = dev_get_priv(dev);
|
|
|
|
if (tpm->init_done)
|
|
return -EIO;
|
|
|
|
tpm->init_done = true;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_tpm2_probe(struct udevice *dev)
|
|
{
|
|
struct sandbox_tpm2 *tpm = dev_get_priv(dev);
|
|
struct tpm_chip_priv *priv = dev_get_uclass_priv(dev);
|
|
|
|
/* Use the TPM v2 stack */
|
|
priv->version = TPM_V2;
|
|
|
|
memset(tpm, 0, sizeof(*tpm));
|
|
|
|
priv->pcr_count = 32;
|
|
priv->pcr_select_min = 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sandbox_tpm2_close(struct udevice *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static const struct tpm_ops sandbox_tpm2_ops = {
|
|
.open = sandbox_tpm2_open,
|
|
.close = sandbox_tpm2_close,
|
|
.get_desc = sandbox_tpm2_get_desc,
|
|
.xfer = sandbox_tpm2_xfer,
|
|
};
|
|
|
|
static const struct udevice_id sandbox_tpm2_ids[] = {
|
|
{ .compatible = "sandbox,tpm2" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(sandbox_tpm2) = {
|
|
.name = "sandbox_tpm2",
|
|
.id = UCLASS_TPM,
|
|
.of_match = sandbox_tpm2_ids,
|
|
.ops = &sandbox_tpm2_ops,
|
|
.probe = sandbox_tpm2_probe,
|
|
.priv_auto_alloc_size = sizeof(struct sandbox_tpm2),
|
|
};
|