linux/security/keys/trusted.h
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   1#ifndef __TRUSTED_KEY_H
   2#define __TRUSTED_KEY_H
   3
   4/* implementation specific TPM constants */
   5#define MAX_PCRINFO_SIZE                64
   6#define MAX_BUF_SIZE                    512
   7#define TPM_GETRANDOM_SIZE              14
   8#define TPM_OSAP_SIZE                   36
   9#define TPM_OIAP_SIZE                   10
  10#define TPM_SEAL_SIZE                   87
  11#define TPM_UNSEAL_SIZE                 104
  12#define TPM_SIZE_OFFSET                 2
  13#define TPM_RETURN_OFFSET               6
  14#define TPM_DATA_OFFSET                 10
  15
  16#define LOAD32(buffer, offset)  (ntohl(*(uint32_t *)&buffer[offset]))
  17#define LOAD32N(buffer, offset) (*(uint32_t *)&buffer[offset])
  18#define LOAD16(buffer, offset)  (ntohs(*(uint16_t *)&buffer[offset]))
  19
  20struct tpm_buf {
  21        int len;
  22        unsigned char data[MAX_BUF_SIZE];
  23};
  24
  25#define INIT_BUF(tb) (tb->len = 0)
  26
  27struct osapsess {
  28        uint32_t handle;
  29        unsigned char secret[SHA1_DIGEST_SIZE];
  30        unsigned char enonce[TPM_NONCE_SIZE];
  31};
  32
  33/* discrete values, but have to store in uint16_t for TPM use */
  34enum {
  35        SEAL_keytype = 1,
  36        SRK_keytype = 4
  37};
  38
  39struct trusted_key_options {
  40        uint16_t keytype;
  41        uint32_t keyhandle;
  42        unsigned char keyauth[SHA1_DIGEST_SIZE];
  43        unsigned char blobauth[SHA1_DIGEST_SIZE];
  44        uint32_t pcrinfo_len;
  45        unsigned char pcrinfo[MAX_PCRINFO_SIZE];
  46        int pcrlock;
  47};
  48
  49#define TPM_DEBUG 0
  50
  51#if TPM_DEBUG
  52static inline void dump_options(struct trusted_key_options *o)
  53{
  54        pr_info("trusted_key: sealing key type %d\n", o->keytype);
  55        pr_info("trusted_key: sealing key handle %0X\n", o->keyhandle);
  56        pr_info("trusted_key: pcrlock %d\n", o->pcrlock);
  57        pr_info("trusted_key: pcrinfo %d\n", o->pcrinfo_len);
  58        print_hex_dump(KERN_INFO, "pcrinfo ", DUMP_PREFIX_NONE,
  59                       16, 1, o->pcrinfo, o->pcrinfo_len, 0);
  60}
  61
  62static inline void dump_payload(struct trusted_key_payload *p)
  63{
  64        pr_info("trusted_key: key_len %d\n", p->key_len);
  65        print_hex_dump(KERN_INFO, "key ", DUMP_PREFIX_NONE,
  66                       16, 1, p->key, p->key_len, 0);
  67        pr_info("trusted_key: bloblen %d\n", p->blob_len);
  68        print_hex_dump(KERN_INFO, "blob ", DUMP_PREFIX_NONE,
  69                       16, 1, p->blob, p->blob_len, 0);
  70        pr_info("trusted_key: migratable %d\n", p->migratable);
  71}
  72
  73static inline void dump_sess(struct osapsess *s)
  74{
  75        print_hex_dump(KERN_INFO, "trusted-key: handle ", DUMP_PREFIX_NONE,
  76                       16, 1, &s->handle, 4, 0);
  77        pr_info("trusted-key: secret:\n");
  78        print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
  79                       16, 1, &s->secret, SHA1_DIGEST_SIZE, 0);
  80        pr_info("trusted-key: enonce:\n");
  81        print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE,
  82                       16, 1, &s->enonce, SHA1_DIGEST_SIZE, 0);
  83}
  84
  85static inline void dump_tpm_buf(unsigned char *buf)
  86{
  87        int len;
  88
  89        pr_info("\ntrusted-key: tpm buffer\n");
  90        len = LOAD32(buf, TPM_SIZE_OFFSET);
  91        print_hex_dump(KERN_INFO, "", DUMP_PREFIX_NONE, 16, 1, buf, len, 0);
  92}
  93#else
  94static inline void dump_options(struct trusted_key_options *o)
  95{
  96}
  97
  98static inline void dump_payload(struct trusted_key_payload *p)
  99{
 100}
 101
 102static inline void dump_sess(struct osapsess *s)
 103{
 104}
 105
 106static inline void dump_tpm_buf(unsigned char *buf)
 107{
 108}
 109#endif
 110
 111static inline void store8(struct tpm_buf *buf, const unsigned char value)
 112{
 113        buf->data[buf->len++] = value;
 114}
 115
 116static inline void store16(struct tpm_buf *buf, const uint16_t value)
 117{
 118        *(uint16_t *) & buf->data[buf->len] = htons(value);
 119        buf->len += sizeof value;
 120}
 121
 122static inline void store32(struct tpm_buf *buf, const uint32_t value)
 123{
 124        *(uint32_t *) & buf->data[buf->len] = htonl(value);
 125        buf->len += sizeof value;
 126}
 127
 128static inline void storebytes(struct tpm_buf *buf, const unsigned char *in,
 129                              const int len)
 130{
 131        memcpy(buf->data + buf->len, in, len);
 132        buf->len += len;
 133}
 134#endif
 135
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