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tpm: add TPM2_HierarchyChangeAuth command support

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Add support for the TPM2_HierarchyChangeAuth command.

Change the command file and the help accordingly.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Miquel Raynal
2018-05-15 11:57:19 +02:00
committed by Tom Rini
parent da9c3392e6
commit dc26e913a8
3 changed files with 105 additions and 12 deletions
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44
lib/tpm-v2.c
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@@ -273,3 +273,47 @@ u32 tpm2_dam_parameters(const char *pw, const ssize_t pw_sz,
return tpm_sendrecv_command(command_v2, NULL, NULL);
}
int tpm2_change_auth(u32 handle, const char *newpw, const ssize_t newpw_sz,
const char *oldpw, const ssize_t oldpw_sz)
{
unsigned int offset = 27;
u8 command_v2[COMMAND_BUFFER_SIZE] = {
tpm_u16(TPM2_ST_SESSIONS), /* TAG */
tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
/* HANDLE */
tpm_u32(handle), /* TPM resource handle */
/* AUTH_SESSION */
tpm_u32(9 + oldpw_sz), /* Authorization size */
tpm_u32(TPM2_RS_PW), /* Session handle */
tpm_u16(0), /* Size of <nonce> */
/* <nonce> (if any) */
0, /* Attributes: Cont/Excl/Rst */
tpm_u16(oldpw_sz) /* Size of <hmac/password> */
/* STRING(oldpw) <hmac/password> (if any) */
/* TPM2B_AUTH (TPM2B_DIGEST) */
/* tpm_u16(newpw_sz) Digest size, new pw length */
/* STRING(newpw) Digest buffer, new pw */
};
int ret;
/*
* Fill the command structure starting from the first buffer:
* - the old password (if any)
* - size of the new password
* - new password
*/
ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
offset, oldpw, oldpw_sz,
offset + oldpw_sz, newpw_sz,
offset + oldpw_sz + 2, newpw, newpw_sz);
offset += oldpw_sz + 2 + newpw_sz;
if (ret)
return TPM_LIB_ERROR;
return tpm_sendrecv_command(command_v2, NULL, NULL);
}