security/keys/trusted.h

   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
  20 struct tpm_buf {
  21         int len;
  22         unsigned char data[MAX_BUF_SIZE];
  23 };
  24
  25 #define INIT_BUF(tb) (tb->len = 0)
  26
  27 struct 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 */
  34 enum {
  35         SEAL_keytype = 1,
  36         SRK_keytype = 4
  37 };
  38
  39 struct 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
  52 static 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
  62 static 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
  73 static 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
  85 static 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
  94 static inline void dump_options(struct trusted_key_options *o)
  95 {
  96 }
  97
  98 static inline void dump_payload(struct trusted_key_payload *p)
  99 {
 100 }
 101
 102 static inline void dump_sess(struct osapsess *s)
 103 {
 104 }
 105
 106 static inline void dump_tpm_buf(unsigned char *buf)
 107 {
 108 }
 109 #endif
 110
 111 static inline void store8(struct tpm_buf *buf, const unsigned char value)
 112 {
 113         buf->data[buf->len++] = value;
 114 }
 115
 116 static 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
 122 static 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
 128 static 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