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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Move some useful cryptographic enveloping code into their own
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 9f9984af7f4092dd60cd064a6bc74cfc7f5af46b
# Parent b57c6fca4cefd906ef91b9088050b5f3a4908aa1
Move some useful cryptographic enveloping code into their own
functions so they can be used by other parts of the VTPM code.
Signed-off-by: Vinnie Scarlata <vincent.r.scarlata@xxxxxxxxx>
diff -r b57c6fca4cef -r 9f9984af7f40 tools/vtpm_manager/manager/securestorage.c
--- a/tools/vtpm_manager/manager/securestorage.c Fri Dec 16 11:51:06 2005
+++ b/tools/vtpm_manager/manager/securestorage.c Fri Dec 16 17:54:57 2005
@@ -54,48 +54,138 @@
#include "buffer.h"
#include "log.h"
+TPM_RESULT envelope_encrypt(const buffer_t *inbuf,
+ CRYPTO_INFO *asymkey,
+ buffer_t *sealed_data) {
+ TPM_RESULT status = TPM_SUCCESS;
+ symkey_t symkey;
+ buffer_t data_cipher = NULL_BUF,
+ symkey_cipher = NULL_BUF;
+
+ UINT32 i;
+ struct pack_constbuf_t symkey_cipher32, data_cipher32;
+
+ vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Enveloping[%d]: 0x", buffer_len(inbuf));
+ for (i=0; i< buffer_len(inbuf); i++)
+ vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", inbuf->bytes[i]);
+ vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
+
+ // Generate a sym key and encrypt state with it
+ TPMTRY(TPM_ENCRYPT_ERROR, Crypto_symcrypto_genkey (&symkey) );
+ TPMTRY(TPM_ENCRYPT_ERROR, Crypto_symcrypto_encrypt (&symkey, inbuf,
&data_cipher) );
+
+ // Encrypt symmetric key
+ TPMTRYRETURN( VTSP_Bind( asymkey,
+ &symkey.key,
+ &symkey_cipher) );
+
+ // Create output blob: symkey_size + symkey_cipher + state_cipher_size +
state_cipher
+
+ symkey_cipher32.size = buffer_len(&symkey_cipher);
+ symkey_cipher32.data = symkey_cipher.bytes;
+
+ data_cipher32.size = buffer_len(&data_cipher);
+ data_cipher32.data = data_cipher.bytes;
+
+ TPMTRYRETURN( buffer_init(sealed_data, 2 * sizeof(UINT32) +
symkey_cipher32.size + data_cipher32.size, NULL));
+
+ BSG_PackList(sealed_data->bytes, 2,
+ BSG_TPM_SIZE32_DATA, &symkey_cipher32,
+ BSG_TPM_SIZE32_DATA, &data_cipher32);
+
+ vtpmloginfo(VTPM_LOG_VTPM, "Saved %d bytes of E(symkey) + %d bytes of
E(data)\n", buffer_len(&symkey_cipher), buffer_len(&data_cipher));
+ goto egress;
+
+ abort_egress:
+ vtpmlogerror(VTPM_LOG_VTPM, "Failed to envelope encrypt\n.");
+
+ egress:
+
+ buffer_free ( &data_cipher);
+ buffer_free ( &symkey_cipher);
+ Crypto_symcrypto_freekey (&symkey);
+
+ return status;
+}
+
+TPM_RESULT envelope_decrypt(const long cipher_size,
+ const BYTE *cipher,
+ TCS_CONTEXT_HANDLE TCSContext,
+ TPM_HANDLE keyHandle,
+ const TPM_AUTHDATA *key_usage_auth,
+ buffer_t *unsealed_data) {
+
+ TPM_RESULT status = TPM_SUCCESS;
+ symkey_t symkey;
+ buffer_t data_cipher = NULL_BUF,
+ symkey_clear = NULL_BUF,
+ symkey_cipher = NULL_BUF;
+ struct pack_buf_t symkey_cipher32, data_cipher32;
+ int i;
+
+ memset(&symkey, 0, sizeof(symkey_t));
+
+ vtpmloginfo(VTPM_LOG_VTPM_DEEP, "envelope decrypting[%ld]: 0x", cipher_size);
+ for (i=0; i< cipher_size; i++)
+ vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", cipher[i]);
+ vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
+
+ BSG_UnpackList(cipher, 2,
+ BSG_TPM_SIZE32_DATA, &symkey_cipher32,
+ BSG_TPM_SIZE32_DATA, &data_cipher32);
+
+ TPMTRYRETURN( buffer_init_convert (&symkey_cipher,
+ symkey_cipher32.size,
+ symkey_cipher32.data) );
+
+ TPMTRYRETURN( buffer_init_convert (&data_cipher,
+ data_cipher32.size,
+ data_cipher32.data) );
+
+ // Decrypt Symmetric Key
+ TPMTRYRETURN( VTSP_Unbind( TCSContext,
+ keyHandle,
+ &symkey_cipher,
+ key_usage_auth,
+ &symkey_clear,
+ &(vtpm_globals->keyAuth) ) );
+
+ // create symmetric key using saved bits
+ Crypto_symcrypto_initkey (&symkey, &symkey_clear);
+
+ // Decrypt State
+ TPMTRY(TPM_DECRYPT_ERROR, Crypto_symcrypto_decrypt (&symkey, &data_cipher,
unsealed_data) );
+
+ goto egress;
+
+ abort_egress:
+ vtpmlogerror(VTPM_LOG_VTPM, "Failed to envelope decrypt data\n.");
+
+ egress:
+ buffer_free ( &data_cipher);
+ buffer_free ( &symkey_clear);
+ buffer_free ( &symkey_cipher);
+ Crypto_symcrypto_freekey (&symkey);
+
+ return status;
+}
+
TPM_RESULT VTPM_Handle_Save_NVM(VTPM_DMI_RESOURCE *myDMI,
const buffer_t *inbuf,
buffer_t *outbuf) {
TPM_RESULT status = TPM_SUCCESS;
- symkey_t symkey;
- buffer_t state_cipher = NULL_BUF,
- symkey_cipher = NULL_BUF;
int fh;
long bytes_written;
- BYTE *sealed_NVM=NULL;
- UINT32 sealed_NVM_size, i;
- struct pack_constbuf_t symkey_cipher32, state_cipher32;
-
- vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Save_NVMing[%d]: 0x", buffer_len(inbuf));
- for (i=0; i< buffer_len(inbuf); i++)
- vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", inbuf->bytes[i]);
- vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
-
- // Generate a sym key and encrypt state with it
- TPMTRY(TPM_ENCRYPT_ERROR, Crypto_symcrypto_genkey (&symkey) );
- TPMTRY(TPM_ENCRYPT_ERROR, Crypto_symcrypto_encrypt (&symkey, inbuf,
&state_cipher) );
-
- // Encrypt symmetric key
- TPMTRYRETURN( VTSP_Bind( &vtpm_globals->storageKey,
- &symkey.key,
- &symkey_cipher) );
-
- // Create output blob: symkey_size + symkey_cipher + state_cipher_size +
state_cipher
-
- symkey_cipher32.size = buffer_len(&symkey_cipher);
- symkey_cipher32.data = symkey_cipher.bytes;
-
- state_cipher32.size = buffer_len(&state_cipher);
- state_cipher32.data = state_cipher.bytes;
-
- sealed_NVM = (BYTE *) malloc( 2 * sizeof(UINT32) + symkey_cipher32.size +
state_cipher32.size);
-
- sealed_NVM_size = BSG_PackList(sealed_NVM, 2,
- BSG_TPM_SIZE32_DATA, &symkey_cipher32,
- BSG_TPM_SIZE32_DATA, &state_cipher32);
-
+ buffer_t sealed_NVM;
+
+
+ vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Save_NVMing[%d]: 0x\n", buffer_len(inbuf));
+
+ TPMTRYRETURN( envelope_encrypt(inbuf,
+ &vtpm_globals->storageKey,
+ &sealed_NVM) );
+
// Mark DMI Table so new save state info will get pushed to disk on return.
vtpm_globals->DMI_table_dirty = TRUE;
@@ -104,28 +194,22 @@
// after writing the file? We can't get the old one back.
// TODO: Backup old file and try and recover that way.
fh = open(myDMI->NVMLocation, O_WRONLY | O_CREAT, S_IREAD | S_IWRITE);
- if ( (bytes_written = write(fh, sealed_NVM, sealed_NVM_size) ) != (long)
sealed_NVM_size) {
- vtpmlogerror(VTPM_LOG_VTPM, "We just overwrote a DMI_NVM and failed to
finish. %ld/%ld bytes.\n", bytes_written, (long)sealed_NVM_size);
+ if ( (bytes_written = write(fh, sealed_NVM.bytes, buffer_len(&sealed_NVM) )
!= (long) buffer_len(&sealed_NVM))) {
+ vtpmlogerror(VTPM_LOG_VTPM, "We just overwrote a DMI_NVM and failed to
finish. %ld/%ld bytes.\n", bytes_written, (long)buffer_len(&sealed_NVM));
status = TPM_IOERROR;
goto abort_egress;
}
close(fh);
- Crypto_SHA1Full (sealed_NVM, sealed_NVM_size, (BYTE *)
&myDMI->NVM_measurement);
-
- vtpmloginfo(VTPM_LOG_VTPM, "Saved %d bytes of E(symkey) + %d bytes of
E(NVM)\n", buffer_len(&symkey_cipher), buffer_len(&state_cipher));
- goto egress;
-
- abort_egress:
- vtpmlogerror(VTPM_LOG_VTPM, "Failed to load NVM\n.");
-
- egress:
-
- buffer_free ( &state_cipher);
- buffer_free ( &symkey_cipher);
- free(sealed_NVM);
- Crypto_symcrypto_freekey (&symkey);
-
+ Crypto_SHA1Full (sealed_NVM.bytes, buffer_len(&sealed_NVM), (BYTE *)
&myDMI->NVM_measurement);
+
+ goto egress;
+
+ abort_egress:
+ vtpmlogerror(VTPM_LOG_VTPM, "Failed to save NVM\n.");
+
+ egress:
+ buffer_free(&sealed_NVM);
return status;
}
@@ -136,11 +220,7 @@
buffer_t *outbuf) {
TPM_RESULT status = TPM_SUCCESS;
- symkey_t symkey;
- buffer_t state_cipher = NULL_BUF,
- symkey_clear = NULL_BUF,
- symkey_cipher = NULL_BUF;
- struct pack_buf_t symkey_cipher32, state_cipher32;
+
UINT32 sealed_NVM_size;
BYTE *sealed_NVM = NULL;
@@ -148,9 +228,7 @@
int fh, stat_ret, i;
struct stat file_stat;
TPM_DIGEST sealedNVMHash;
-
- memset(&symkey, 0, sizeof(symkey_t));
-
+
if (myDMI->NVMLocation == NULL) {
vtpmlogerror(VTPM_LOG_VTPM, "Unable to load NVM because the file name
NULL.\n");
status = TPM_AUTHFAIL;
@@ -168,28 +246,14 @@
}
sealed_NVM = (BYTE *) malloc(fh_size);
+ sealed_NVM_size = (UINT32) fh_size;
if (read(fh, sealed_NVM, fh_size) != fh_size) {
status = TPM_IOERROR;
goto abort_egress;
}
close(fh);
- vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Load_NVMing[%ld]: 0x", fh_size);
- for (i=0; i< fh_size; i++)
- vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "%x ", sealed_NVM[i]);
- vtpmloginfomore(VTPM_LOG_VTPM_DEEP, "\n");
-
- sealed_NVM_size = BSG_UnpackList(sealed_NVM, 2,
- BSG_TPM_SIZE32_DATA, &symkey_cipher32,
- BSG_TPM_SIZE32_DATA, &state_cipher32);
-
- TPMTRYRETURN( buffer_init_convert (&symkey_cipher,
- symkey_cipher32.size,
- symkey_cipher32.data) );
-
- TPMTRYRETURN( buffer_init_convert (&state_cipher,
- state_cipher32.size,
- state_cipher32.data) );
+ vtpmloginfo(VTPM_LOG_VTPM_DEEP, "Load_NVMing[%ld],\n", fh_size);
Crypto_SHA1Full(sealed_NVM, sealed_NVM_size, (BYTE *) &sealedNVMHash);
@@ -210,32 +274,19 @@
goto abort_egress;
}
- // Decrypt Symmetric Key
- TPMTRYRETURN( VTSP_Unbind( myDMI->TCSContext,
- vtpm_globals->storageKeyHandle,
- &symkey_cipher,
- (const
TPM_AUTHDATA*)&vtpm_globals->storage_key_usage_auth,
- &symkey_clear,
- &(vtpm_globals->keyAuth) ) );
-
- // create symmetric key using saved bits
- Crypto_symcrypto_initkey (&symkey, &symkey_clear);
-
- // Decrypt State
- TPMTRY(TPM_DECRYPT_ERROR, Crypto_symcrypto_decrypt (&symkey, &state_cipher,
outbuf) );
-
+ TPMTRYRETURN( envelope_decrypt(fh_size,
+ sealed_NVM,
+ myDMI->TCSContext,
+ vtpm_globals->storageKeyHandle,
+ (const
TPM_AUTHDATA*)&vtpm_globals->storage_key_usage_auth,
+ outbuf) );
goto egress;
abort_egress:
vtpmlogerror(VTPM_LOG_VTPM, "Failed to load NVM\n.");
egress:
-
- buffer_free ( &state_cipher);
- buffer_free ( &symkey_clear);
- buffer_free ( &symkey_cipher);
free( sealed_NVM );
- Crypto_symcrypto_freekey (&symkey);
return status;
}
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