trusted.h

Go to the documentation of this file.

#ifndef __TRUSTED_KEY_H
#define __TRUSTED_KEY_H

/* implementation specific TPM constants */
#define MAX_PCRINFO_SIZE        64
#define MAX_BUF_SIZE            512
#define TPM_GETRANDOM_SIZE      14
#define TPM_OSAP_SIZE           36
#define TPM_OIAP_SIZE           10
#define TPM_SEAL_SIZE           87
#define TPM_UNSEAL_SIZE         104
#define TPM_SIZE_OFFSET         2
#define TPM_RETURN_OFFSET       6
#define TPM_DATA_OFFSET         10

#define LOAD32(buffer, offset)  (ntohl(*(uint32_t *)&buffer[offset]))
#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
#define LOAD16(buffer, offset)  (ntohs(*(uint16_t *)&buffer[offset]))

struct tpm_buf {
    int len;
    unsigned char data[MAX_BUF_SIZE];
};

#define INIT_BUF(tb) (tb->len = 0)

struct osapsess {
    uint32_t handle;
    unsigned char secret[SHA1_DIGEST_SIZE];
    unsigned char enonce[TPM_NONCE_SIZE];
};

/* discrete values, but have to store in uint16_t for TPM use */
enum {
    SEAL_keytype = 1,
    SRK_keytype = 4
};

struct trusted_key_options {
    uint16_t keytype;
    uint32_t keyhandle;
    unsigned char keyauth[SHA1_DIGEST_SIZE];
    unsigned char blobauth[SHA1_DIGEST_SIZE];
    uint32_t pcrinfo_len;
    unsigned char pcrinfo[MAX_PCRINFO_SIZE];
    int pcrlock;
};

#define TPM_DEBUG 0

#if TPM_DEBUG
static inline void dump_options(struct trusted_key_options *o)
{
    pr_info("trusted_key: sealing key type %d\n", o->keytype);
    pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle);
    pr_info("trusted_key: pcrlock %d\n", o->pcrlock);
    pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len);
    print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
               16, 1, o->pcrinfo, o->pcrinfo_len, 0);
}

static inline void dump_payload(struct trusted_key_payload *p)
{
    pr_info("trusted_key: key_len %d\n", p->key_len);
    print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
               16, 1, p->key, p->key_len, 0);
    pr_info("trusted_key: bloblen %d\n", p->blob_len);
    print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
               16, 1, p->blob, p->blob_len, 0);
    pr_info("trusted_key: migratable %d\n", p->migratable);
}

static inline void dump_sess(struct osapsess *s)
{
    print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
               16, 1, &s->handle, 4, 0);
    pr_info("trusted-key: secret:\n");
    print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
               16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
    pr_info("trusted-key: enonce:\n");
    print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
               16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
}

static inline void dump_tpm_buf(unsigned char *buf)
{
    int len;

    pr_info("\ntrusted-key: tpm buffer\n");
    len = LOAD32(buf, TPM_SIZE_OFFSET);
    print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
}
#else
static inline void dump_options(struct trusted_key_options *o)
{
}

static inline void dump_payload(struct trusted_key_payload *p)
{
}

static inline void dump_sess(struct osapsess *s)
{
}

static inline void dump_tpm_buf(unsigned char *buf)
{
}
#endif

static inline void store8(struct tpm_buf *buf, const unsigned char value)
{
    buf->data[buf->len++] = value;
}

static inline void store16(struct tpm_buf *buf, const uint16_t value)
{
    *(uint16_t *) & buf->data[buf->len] = htons(value);
    buf->len += sizeof value;
}

static inline void store32(struct tpm_buf *buf, const uint32_t value)
{
    *(uint32_t *) & buf->data[buf->len] = htonl(value);
    buf->len += sizeof value;
}

static inline void storebytes(struct tpm_buf *buf, const unsigned char *in,
                  const int len)
{
    memcpy(buf->data + buf->len, in, len);
    buf->len += len;
}
#endif