securityd-55199.3.tar.gz

[apple/securityd.git] / src / dbcrypto.cpp

diff --git a/src/dbcrypto.cpp b/src/dbcrypto.cpp
index 5054f85d1d6f71605795223fdda52c108599f1ac..83d4469d00e3a925726cbd88e2297f89f97cf947 100644 (file)
--- a/src/dbcrypto.cpp
+++ b/src/dbcrypto.cpp
@@ -135,6 +135,15 @@ void DatabaseCryptoCore::setup(const DbBlob *blob, CssmClient::Key master)
        mHaveMaster = true;
 }
 
        mHaveMaster = true;
 }
 

+bool DatabaseCryptoCore::get_encryption_key(CssmOwnedData &data)
+{
+    bool result = false;
+    if (isValid()) {
+        data = mEncryptionKey->keyData();
+        result = true;
+    }
+    return result;
+}

 
 //
 // Given a putative passphrase, determine whether that passphrase
 
 //
 // Given a putative passphrase, determine whether that passphrase


@@ -306,31 +315,45 @@ void DatabaseCryptoCore::importSecrets(const DatabaseCryptoCore &src)
 // Encode a key blob
 //
 KeyBlob *DatabaseCryptoCore::encodeKeyCore(const CssmKey &inKey,
 // Encode a key blob
 //
 KeyBlob *DatabaseCryptoCore::encodeKeyCore(const CssmKey &inKey,

-    const CssmData &publicAcl, const CssmData &privateAcl) const
+    const CssmData &publicAcl, const CssmData &privateAcl,
+       bool inTheClear) const

 {
 {

-    assert(isValid());         // need our database secrets
-    
-    // create new IV
-    uint8 iv[8];
-    Server::active().random(iv);
-    
-    // extract and hold some header bits the CSP does not want to see

     CssmKey key = inKey;
     CssmKey key = inKey;

+       uint8 iv[8];
+       CssmKey wrappedKey;
+
+       if(inTheClear && (privateAcl.Length != 0)) {
+               /* can't store private ACL component in the clear */
+               CssmError::throwMe(CSSMERR_DL_INVALID_ACCESS_CREDENTIALS);
+       }
+       
+    // extract and hold some header bits the CSP does not want to see

     uint32 heldAttributes = key.attributes() & managedAttributes;
     key.clearAttribute(managedAttributes);
        key.setAttribute(forcedAttributes);
     
     uint32 heldAttributes = key.attributes() & managedAttributes;
     key.clearAttribute(managedAttributes);
        key.setAttribute(forcedAttributes);
     

-    // use a CMS wrap to encrypt the key
-    WrapKey wrap(Server::csp(), CSSM_ALGID_3DES_3KEY_EDE);
-    wrap.key(mEncryptionKey);
-    wrap.mode(CSSM_ALGMODE_CBCPadIV8);
-    wrap.padding(CSSM_PADDING_PKCS1);
-    CssmData ivd(iv, sizeof(iv)); wrap.initVector(ivd);
-    wrap.add(CSSM_ATTRIBUTE_WRAPPED_KEY_FORMAT,
-        uint32(CSSM_KEYBLOB_WRAPPED_FORMAT_APPLE_CUSTOM));
-    CssmKey wrappedKey;
-    wrap(key, wrappedKey, &privateAcl);
-    
+       if(inTheClear) {
+               /* NULL wrap of public key */
+               WrapKey wrap(Server::csp(), CSSM_ALGID_NONE);
+               wrap(key, wrappedKey, NULL);
+       }
+       else {
+               assert(isValid());              // need our database secrets
+               
+               // create new IV
+               Server::active().random(iv);
+               
+          // use a CMS wrap to encrypt the key
+               WrapKey wrap(Server::csp(), CSSM_ALGID_3DES_3KEY_EDE);
+               wrap.key(mEncryptionKey);
+               wrap.mode(CSSM_ALGMODE_CBCPadIV8);
+               wrap.padding(CSSM_PADDING_PKCS1);
+               CssmData ivd(iv, sizeof(iv)); wrap.initVector(ivd);
+               wrap.add(CSSM_ATTRIBUTE_WRAPPED_KEY_FORMAT,
+                       uint32(CSSM_KEYBLOB_WRAPPED_FORMAT_APPLE_CUSTOM));
+               wrap(key, wrappedKey, &privateAcl);
+    }
+       

     // stick the held attribute bits back in
        key.clearAttribute(forcedAttributes);
     key.setAttribute(heldAttributes);
     // stick the held attribute bits back in
        key.clearAttribute(forcedAttributes);
     key.setAttribute(heldAttributes);


@@ -342,7 +365,9 @@ KeyBlob *DatabaseCryptoCore::encodeKeyCore(const CssmKey &inKey,
     // assemble the KeyBlob
     memset(blob, 0, sizeof(KeyBlob));  // fill alignment gaps
     blob->initialize();
     // assemble the KeyBlob
     memset(blob, 0, sizeof(KeyBlob));  // fill alignment gaps
     blob->initialize();

-    memcpy(blob->iv, iv, sizeof(iv));
+       if(!inTheClear) {
+               memcpy(blob->iv, iv, sizeof(iv));
+       }

     blob->header = key.header();
        h2ni(blob->header);     // endian-correct the header
     blob->wrappedHeader.blobType = wrappedKey.blobType();
     blob->header = key.header();
        h2ni(blob->header);     // endian-correct the header
     blob->wrappedHeader.blobType = wrappedKey.blobType();


@@ -354,17 +379,23 @@ KeyBlob *DatabaseCryptoCore::encodeKeyCore(const CssmKey &inKey,
     memcpy(blob->cryptoBlob(), wrappedKey.data(), wrappedKey.length());
     blob->totalLength = blob->startCryptoBlob + wrappedKey.length();
     
     memcpy(blob->cryptoBlob(), wrappedKey.data(), wrappedKey.length());
     blob->totalLength = blob->startCryptoBlob + wrappedKey.length();
     

-    // sign the blob
-    CssmData signChunk[] = {
-               CssmData(blob->data(), fieldOffsetOf(&KeyBlob::blobSignature)),
-       CssmData(blob->publicAclBlob(), blob->publicAclBlobLength() + blob->cryptoBlobLength())
-       };
-    CssmData signature(blob->blobSignature, sizeof(blob->blobSignature));
-    GenerateMac signer(Server::csp(), CSSM_ALGID_SHA1HMAC_LEGACY);     //@@@!!! CRUD
-    signer.key(mSigningKey);
-    signer.sign(signChunk, 2, signature);
-    assert(signature.length() == sizeof(blob->blobSignature));
-    
+       if(inTheClear) {
+               /* indicate that this is cleartext for decoding */
+               blob->setClearTextSignature();
+       }
+       else {
+               // sign the blob
+               CssmData signChunk[] = {
+                       CssmData(blob->data(), fieldOffsetOf(&KeyBlob::blobSignature)),
+                       CssmData(blob->publicAclBlob(), blob->publicAclBlobLength() + blob->cryptoBlobLength())
+               };
+               CssmData signature(blob->blobSignature, sizeof(blob->blobSignature));
+               GenerateMac signer(Server::csp(), CSSM_ALGID_SHA1HMAC_LEGACY);  //@@@!!! CRUD
+               signer.key(mSigningKey);
+               signer.sign(signChunk, 2, signature);
+               assert(signature.length() == sizeof(blob->blobSignature));
+    }
+       

     // all done. Clean up
     Server::csp()->allocator().free(wrappedKey);
     return blob;
     // all done. Clean up
     Server::csp()->allocator().free(wrappedKey);
     return blob;


@@ -376,9 +407,7 @@ KeyBlob *DatabaseCryptoCore::encodeKeyCore(const CssmKey &inKey,
 //
 void DatabaseCryptoCore::decodeKeyCore(KeyBlob *blob,
     CssmKey &key, void * &pubAcl, void * &privAcl) const
 //
 void DatabaseCryptoCore::decodeKeyCore(KeyBlob *blob,
     CssmKey &key, void * &pubAcl, void * &privAcl) const

-{
-    assert(isValid());         // need our database secrets
-    
+{    

     // Assemble the encrypted blob as a CSSM "wrapped key"
     CssmKey wrappedKey;
     wrappedKey.KeyHeader = blob->header;
     // Assemble the encrypted blob as a CSSM "wrapped key"
     CssmKey wrappedKey;
     wrappedKey.KeyHeader = blob->header;


@@ -389,39 +418,55 @@ void DatabaseCryptoCore::decodeKeyCore(KeyBlob *blob,
     wrappedKey.wrapMode(blob->wrappedHeader.wrapMode);
     wrappedKey.KeyData = CssmData(blob->cryptoBlob(), blob->cryptoBlobLength());
        
     wrappedKey.wrapMode(blob->wrappedHeader.wrapMode);
     wrappedKey.KeyData = CssmData(blob->cryptoBlob(), blob->cryptoBlobLength());
        

-    // verify signature (check against corruption)
-    CssmData signChunk[] = {
-       CssmData::wrap(blob, fieldOffsetOf(&KeyBlob::blobSignature)),
-       CssmData(blob->publicAclBlob(), blob->publicAclBlobLength() + blob->cryptoBlobLength())
-       };
-    CSSM_ALGORITHMS verifyAlgorithm = CSSM_ALGID_SHA1HMAC;
-#if defined(COMPAT_OSX_10_0)
-    if (blob->version() == blob->version_MacOS_10_0)
-        verifyAlgorithm = CSSM_ALGID_SHA1HMAC_LEGACY;  // BSafe bug compatibility
-#endif
-    VerifyMac verifier(Server::csp(), verifyAlgorithm);
-    verifier.key(mSigningKey);
-    CssmData signature(blob->blobSignature, sizeof(blob->blobSignature));
-    verifier.verify(signChunk, 2, signature);
-    
+       bool inTheClear = blob->isClearText();
+       if(!inTheClear) {
+               // verify signature (check against corruption)
+               assert(isValid());              // need our database secrets
+               CssmData signChunk[] = {
+                       CssmData::wrap(blob, fieldOffsetOf(&KeyBlob::blobSignature)),
+                       CssmData(blob->publicAclBlob(), blob->publicAclBlobLength() + blob->cryptoBlobLength())
+               };
+               CSSM_ALGORITHMS verifyAlgorithm = CSSM_ALGID_SHA1HMAC;
+       #if defined(COMPAT_OSX_10_0)
+               if (blob->version() == blob->version_MacOS_10_0)
+                       verifyAlgorithm = CSSM_ALGID_SHA1HMAC_LEGACY;   // BSafe bug compatibility
+       #endif
+               VerifyMac verifier(Server::csp(), verifyAlgorithm);
+               verifier.key(mSigningKey);
+               CssmData signature(blob->blobSignature, sizeof(blob->blobSignature));
+               verifier.verify(signChunk, 2, signature);
+    }
+       /* else signature indicates cleartext */
+       

     // extract and hold some header bits the CSP does not want to see
     uint32 heldAttributes = n2h(blob->header.attributes()) & managedAttributes;
    
     // extract and hold some header bits the CSP does not want to see
     uint32 heldAttributes = n2h(blob->header.attributes()) & managedAttributes;
    

-    // decrypt the key using an unwrapping operation
-    UnwrapKey unwrap(Server::csp(), CSSM_ALGID_3DES_3KEY_EDE);
-    unwrap.key(mEncryptionKey);
-    unwrap.mode(CSSM_ALGMODE_CBCPadIV8);
-    unwrap.padding(CSSM_PADDING_PKCS1);
-    CssmData ivd(blob->iv, sizeof(blob->iv)); unwrap.initVector(ivd);
-    unwrap.add(CSSM_ATTRIBUTE_WRAPPED_KEY_FORMAT,
-        uint32(CSSM_KEYBLOB_WRAPPED_FORMAT_APPLE_CUSTOM));
-    CssmData privAclData;
-    wrappedKey.clearAttribute(managedAttributes);    //@@@ shouldn't be needed(?)
-    unwrap(wrappedKey,
-        KeySpec(n2h(blob->header.usage()),
-                       (n2h(blob->header.attributes()) & ~managedAttributes) | forcedAttributes),
-        key, &privAclData);
-    
+       CssmData privAclData;
+       if(inTheClear) {
+               /* NULL unwrap */
+               UnwrapKey unwrap(Server::csp(), CSSM_ALGID_NONE);
+               wrappedKey.clearAttribute(managedAttributes);    //@@@ shouldn't be needed(?)
+               unwrap(wrappedKey,
+                       KeySpec(n2h(blob->header.usage()),
+                               (n2h(blob->header.attributes()) & ~managedAttributes) | forcedAttributes),
+                       key, &privAclData);
+       }
+       else {
+               // decrypt the key using an unwrapping operation
+               UnwrapKey unwrap(Server::csp(), CSSM_ALGID_3DES_3KEY_EDE);
+               unwrap.key(mEncryptionKey);
+               unwrap.mode(CSSM_ALGMODE_CBCPadIV8);
+               unwrap.padding(CSSM_PADDING_PKCS1);
+               CssmData ivd(blob->iv, sizeof(blob->iv)); unwrap.initVector(ivd);
+               unwrap.add(CSSM_ATTRIBUTE_WRAPPED_KEY_FORMAT,
+                       uint32(CSSM_KEYBLOB_WRAPPED_FORMAT_APPLE_CUSTOM));
+               wrappedKey.clearAttribute(managedAttributes);    //@@@ shouldn't be needed(?)
+               unwrap(wrappedKey,
+                       KeySpec(n2h(blob->header.usage()),
+                               (n2h(blob->header.attributes()) & ~managedAttributes) | forcedAttributes),
+                       key, &privAclData);
+    }
+       

     // compare retrieved key headers with blob headers (sanity check)
     // @@@ this should probably be checked over carefully
     CssmKey::Header &real = key.header();
     // compare retrieved key headers with blob headers (sanity check)
     // @@@ this should probably be checked over carefully
     CssmKey::Header &real = key.header();


@@ -437,9 +482,15 @@ void DatabaseCryptoCore::decodeKeyCore(KeyBlob *blob,
     // re-insert held bits
     key.header().KeyAttr |= heldAttributes;
     
     // re-insert held bits
     key.header().KeyAttr |= heldAttributes;
     

+       if(inTheClear && (real.keyClass() != CSSM_KEYCLASS_PUBLIC_KEY)) {
+               /* Spoof - cleartext KeyBlob passed off as private key */
+        CssmError::throwMe(CSSMERR_CSP_INVALID_KEY);
+       }
+       

     // got a valid key: return the pieces
     pubAcl = blob->publicAclBlob();            // points into blob (shared)
     // got a valid key: return the pieces
     pubAcl = blob->publicAclBlob();            // points into blob (shared)

-    privAcl = privAclData;                             // was allocated by CSP decrypt
+    privAcl = privAclData;                             // was allocated by CSP decrypt, else NULL for
+                                                                               // cleatext keys

     // key was set by unwrap operation
 }
 
     // key was set by unwrap operation
 }