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1 /*
2 * Copyright (c) 2015 Apple Inc. All Rights Reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23
24 #include "CSPDLTransaction.h"
25 #include <Security/SecBasePriv.h>
26 #include <syslog.h>
27
28 #if TARGET_OS_OSX
29
30 DLTransaction::DLTransaction(CSSM_DL_DB_HANDLE dldbh)
31 : mDldbh(dldbh), mSuccess(false), mFinalized(false), mAutoCommit(CSSM_TRUE) {
32 initialize();
33 }
34
35 DLTransaction::DLTransaction()
36 : mSuccess(false), mFinalized(false), mAutoCommit(CSSM_TRUE) {
37 }
38
39 void DLTransaction::initialize() {
40 // Turn off autocommit on the underlying DL and remember the old state.
41 Security::CssmClient::ObjectImpl::check(CSSM_DL_PassThrough(mDldbh,
42 CSSM_APPLEFILEDL_TOGGLE_AUTOCOMMIT,
43 NULL, reinterpret_cast<void **>(&mAutoCommit)));
44 }
45
46 DLTransaction::~DLTransaction() {
47 finalize();
48 }
49
50 void DLTransaction::commit() {
51 // Commit the transaction, and throw if it fails
52
53 // If autocommit wasn't on on the database when we started, don't
54 // actually commit. There might be something else going on...
55 if(mAutoCommit) {
56 Security::CssmClient::ObjectImpl::check(CSSM_DL_PassThrough(mDldbh, CSSM_APPLEFILEDL_COMMIT, NULL, NULL));
57 CSSM_DL_PassThrough(mDldbh, CSSM_APPLEFILEDL_TOGGLE_AUTOCOMMIT, reinterpret_cast<const void *>(mAutoCommit), NULL);
58 }
59
60 // Throwing above means this wasn't a success and we're not finalized. On exit, we'll roll back the transaction.
61 mSuccess = true;
62 mFinalized = true;
63 }
64
65 void DLTransaction::rollback() {
66 // If autocommit wasn't on on the database when we started, don't
67 // actually roll back. There might be something else going on...
68 if(mAutoCommit) {
69 CSSM_DL_PassThrough(mDldbh, CSSM_APPLEFILEDL_ROLLBACK, NULL, NULL);
70 CSSM_DL_PassThrough(mDldbh, CSSM_APPLEFILEDL_TOGGLE_AUTOCOMMIT,
71 reinterpret_cast<const void *>(mAutoCommit), NULL);
72 }
73 }
74
75 void DLTransaction::finalize() {
76 if(mFinalized) {
77 return;
78 }
79
80 // if this transaction was not a success, roll back.
81 if(!mSuccess) {
82 // Note that we're likely (but not necessarily) unwinding the stack for an exception right now.
83 // (If this transaction succeeded, we wouldn't be here. So, it failed, and this code likes to fail with exceptions.)
84 // If this throws an exception, we might crash the whole process.
85 // Swallow exceptions whole, but log them aggressively.
86 try {
87 rollback();
88 } catch(CssmError cssme) {
89 const char* errStr = cssmErrorString(cssme.error);
90 secnotice("integrity", "caught CssmError during transaction rollback: %d %s", (int) cssme.error, errStr);
91 syslog(LOG_ERR, "ERROR: failed to rollback keychain transaction: %d %s", (int) cssme.error, errStr);
92 }
93 }
94 mFinalized = true;
95 }
96
97
98 CSPDLTransaction::CSPDLTransaction(Security::CssmClient::Db& db)
99 : DLTransaction(), mDb(db) {
100 // Get the handle of the DL underlying this CSPDL.
101 mDb->passThrough(CSSM_APPLECSPDL_DB_GET_HANDLE, NULL,
102 reinterpret_cast<void **>(&mDldbh));
103
104 initialize();
105 }
106
107 CSPDLTransaction::~CSPDLTransaction() {
108 }
109
110 #endif //TARGET_OS_OSX