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TPM2B buffers, or sized buffers, have a two byte header, which contains the length of the payload as a 16-bit big-endian number, without counting in the space taken by the header. This differs from encoding in the TPM header where the length includes also the bytes taken by the header. Unbound the length of a tpm_buf from the value stored to the TPM command header. A separate encoding and decoding step so that different buffer types can be supported, with variant header format and length encoding. Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com> Reviewed-by: Stefan Berger <stefanb@linux.ibm.com> Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org> Tested-by: Jarkko Sakkinen <jarkko@kernel.org> Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __TRUSTED_TPM_H
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#define __TRUSTED_TPM_H
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#include <keys/trusted-type.h>
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#include <linux/tpm_command.h>
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/* implementation specific TPM constants */
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#define TPM_SIZE_OFFSET 2
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#define TPM_RETURN_OFFSET 6
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#define TPM_DATA_OFFSET 10
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#define LOAD32(buffer, offset) (ntohl(*(uint32_t *)&buffer[offset]))
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#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
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#define LOAD16(buffer, offset) (ntohs(*(uint16_t *)&buffer[offset]))
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extern struct trusted_key_ops trusted_key_tpm_ops;
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struct osapsess {
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uint32_t handle;
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unsigned char secret[SHA1_DIGEST_SIZE];
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unsigned char enonce[TPM_NONCE_SIZE];
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};
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/* discrete values, but have to store in uint16_t for TPM use */
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enum {
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SEAL_keytype = 1,
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SRK_keytype = 4
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};
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int TSS_authhmac(unsigned char *digest, const unsigned char *key,
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unsigned int keylen, unsigned char *h1,
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unsigned char *h2, unsigned int h3, ...);
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int TSS_checkhmac1(unsigned char *buffer,
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const uint32_t command,
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const unsigned char *ononce,
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const unsigned char *key,
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unsigned int keylen, ...);
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int trusted_tpm_send(unsigned char *cmd, size_t buflen);
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int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
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int tpm2_seal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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int tpm2_unseal_trusted(struct tpm_chip *chip,
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struct trusted_key_payload *payload,
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struct trusted_key_options *options);
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#define TPM_DEBUG 0
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#if TPM_DEBUG
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static inline void dump_options(struct trusted_key_options *o)
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{
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pr_info("sealing key type %d\n", o->keytype);
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pr_info("sealing key handle %0X\n", o->keyhandle);
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pr_info("pcrlock %d\n", o->pcrlock);
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pr_info("pcrinfo %d\n", o->pcrinfo_len);
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print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
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16, 1, o->pcrinfo, o->pcrinfo_len, 0);
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}
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static inline void dump_sess(struct osapsess *s)
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{
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print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
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16, 1, &s->handle, 4, 0);
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pr_info("secret:\n");
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
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16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
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pr_info("trusted-key: enonce:\n");
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
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16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
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}
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static inline void dump_tpm_buf(unsigned char *buf)
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{
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int len;
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pr_info("\ntpm buffer\n");
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len = LOAD32(buf, TPM_SIZE_OFFSET);
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print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
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}
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#else
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static inline void dump_options(struct trusted_key_options *o)
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{
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}
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static inline void dump_sess(struct osapsess *s)
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{
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}
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static inline void dump_tpm_buf(unsigned char *buf)
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{
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}
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#endif
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#endif
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