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authorDenis Kenzior <denkenz@gmail.com>2018-10-09 17:48:41 +0100
committerJames Morris <james.morris@microsoft.com>2018-10-26 09:30:47 +0100
commite1ea9f86023e7668604cc6456a818e5e4d0361c9 (patch)
tree7aef92cdad4fcf870507bf42b66a1da0ae9c05e5 /security
parentad4b1eb5fb3350c979a4f86eacfe7aac0595f335 (diff)
downloadlinux-stericsson-e1ea9f86023e7668604cc6456a818e5e4d0361c9.tar.gz
KEYS: trusted: Expose common functionality [ver #2]
This patch exposes some common functionality needed to send TPM commands. Several functions from keys/trusted.c are exposed for use by the new tpm key subtype and a module dependency is introduced. In the future, common functionality between the trusted key type and the asym_tpm subtype should be factored out into a common utility library. Signed-off-by: Denis Kenzior <denkenz@gmail.com> Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marcel Holtmann <marcel@holtmann.org> Reviewed-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: James Morris <james.morris@microsoft.com>
Diffstat (limited to 'security')
-rw-r--r--security/keys/trusted.c12
-rw-r--r--security/keys/trusted.h14
2 files changed, 21 insertions, 5 deletions
diff --git a/security/keys/trusted.c b/security/keys/trusted.c
index b69d3b1777c2..1c025fdfe0e0 100644
--- a/security/keys/trusted.c
+++ b/security/keys/trusted.c
@@ -121,7 +121,7 @@ out:
/*
* calculate authorization info fields to send to TPM
*/
-static int TSS_authhmac(unsigned char *digest, const unsigned char *key,
+int TSS_authhmac(unsigned char *digest, const unsigned char *key,
unsigned int keylen, unsigned char *h1,
unsigned char *h2, unsigned char h3, ...)
{
@@ -168,11 +168,12 @@ out:
kzfree(sdesc);
return ret;
}
+EXPORT_SYMBOL_GPL(TSS_authhmac);
/*
* verify the AUTH1_COMMAND (Seal) result from TPM
*/
-static int TSS_checkhmac1(unsigned char *buffer,
+int TSS_checkhmac1(unsigned char *buffer,
const uint32_t command,
const unsigned char *ononce,
const unsigned char *key,
@@ -249,6 +250,7 @@ out:
kzfree(sdesc);
return ret;
}
+EXPORT_SYMBOL_GPL(TSS_checkhmac1);
/*
* verify the AUTH2_COMMAND (unseal) result from TPM
@@ -355,7 +357,7 @@ out:
* For key specific tpm requests, we will generate and send our
* own TPM command packets using the drivers send function.
*/
-static int trusted_tpm_send(unsigned char *cmd, size_t buflen)
+int trusted_tpm_send(unsigned char *cmd, size_t buflen)
{
int rc;
@@ -367,6 +369,7 @@ static int trusted_tpm_send(unsigned char *cmd, size_t buflen)
rc = -EPERM;
return rc;
}
+EXPORT_SYMBOL_GPL(trusted_tpm_send);
/*
* Lock a trusted key, by extending a selected PCR.
@@ -425,7 +428,7 @@ static int osap(struct tpm_buf *tb, struct osapsess *s,
/*
* Create an object independent authorisation protocol (oiap) session
*/
-static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
+int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
{
int ret;
@@ -442,6 +445,7 @@ static int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce)
TPM_NONCE_SIZE);
return 0;
}
+EXPORT_SYMBOL_GPL(oiap);
struct tpm_digests {
unsigned char encauth[SHA1_DIGEST_SIZE];
diff --git a/security/keys/trusted.h b/security/keys/trusted.h
index 8d5fe9eafb22..adbcb6817826 100644
--- a/security/keys/trusted.h
+++ b/security/keys/trusted.h
@@ -3,7 +3,7 @@
#define __TRUSTED_KEY_H
/* implementation specific TPM constants */
-#define MAX_BUF_SIZE 512
+#define MAX_BUF_SIZE 1024
#define TPM_GETRANDOM_SIZE 14
#define TPM_OSAP_SIZE 36
#define TPM_OIAP_SIZE 10
@@ -36,6 +36,18 @@ enum {
SRK_keytype = 4
};
+int TSS_authhmac(unsigned char *digest, const unsigned char *key,
+ unsigned int keylen, unsigned char *h1,
+ unsigned char *h2, unsigned char h3, ...);
+int TSS_checkhmac1(unsigned char *buffer,
+ const uint32_t command,
+ const unsigned char *ononce,
+ const unsigned char *key,
+ unsigned int keylen, ...);
+
+int trusted_tpm_send(unsigned char *cmd, size_t buflen);
+int oiap(struct tpm_buf *tb, uint32_t *handle, unsigned char *nonce);
+
#define TPM_DEBUG 0
#if TPM_DEBUG