在Mac OS X上列出密钥链中的条目

Question

最近几天我一直在使用Cocoa，我想知道如何列出我创建的钥匙链的所有名称/帐户对？Mac附带的小钥匙链访问应用程序就能做到这一点，所以我猜这肯定是可能的？我要找的是SecItemCopyMatching吗？但是，我如何指定要搜索的密钥链呢？在这种情况下，什么是服务名称？

...am I是唯一一个认为Cocoa中的Keychain API绝对可怕的人？在过去的几个小时左右，我一直在上下地阅读文档，但我仍然一无所获:-/

Answer 1

您可以使用SecItemCopyMatching遍历密钥串中的项，并使用SecKeychainFindInternetPassword或SecKeychainFindGenericPassword访问密码。

在密钥链上迭代

// iterates over keychain and pass every item found by the query to PrintAccount.
static void IterateOverKeychain() {
    // create query
    CFMutableDictionaryRef query = CFDictionaryCreateMutable(kCFAllocatorDefault, 3, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
    CFDictionaryAddValue(query, kSecReturnAttributes, kCFBooleanTrue);
    CFDictionaryAddValue(query, kSecMatchLimit, kSecMatchLimitAll);
    CFDictionaryAddValue(query, kSecClass, kSecClassInternetPassword);

    // get search results
    CFArrayRef result = nil;
    OSStatus status = SecItemCopyMatching(query, (CFTypeRef*)&result);
    assert(status == 0);

    // do something with the result
    CFRange range = CFRangeMake(0, CFArrayGetCount(result));
    CFArrayApplyFunction(result, range, PrintAccount, nil);
}

// prints the password for a item from the keychain.
static void PrintAccount(const void *value, void *context) {
    CFDictionaryRef dict = value;
    CFStringRef acct = CFDictionaryGetValue(dict, kSecAttrAccount);
    NSLog(@"%@", acct);
}

打印密码

static void PrintPassword() {
    const char *acct = "foo.bar@googlemail.com";
    UInt32 acctLen = (UInt32)strlen(acct);

    const char *srvr = "calendar.google.com";
    UInt32 srvrLen = (UInt32)strlen(srvr);

    UInt32 pwLen = 0;
    void *pw = 0;

    SecKeychainFindInternetPassword(nil, srvrLen, srvr, 0, nil, acctLen, acct, 0, nil, 0, kSecProtocolTypeAny, kSecAuthenticationTypeAny, &pwLen, &pw, nil);

    CFStringRef pwString = CFStringCreateWithBytes(kCFAllocatorDefault, pw, pwLen, kCFStringEncodingUTF8, NO);
    NSLog(@"%s %@", acct, pwString);
}

Answer 2

好吧，我设法枚举了密钥链条目，但是密码字段是空的。我想如果需要授权，程序会像往常一样自动要求提供密钥链密码吗？

NSDictionary *query = [NSDictionary dictionaryWithObjectsAndKeys:
                       (id)kSecClassInternetPassword, kSecClass,
                       (id)kCFBooleanTrue, kSecReturnData,
                       (id)kCFBooleanTrue, kSecReturnAttributes,
                       kSecMatchLimitAll, kSecMatchLimit,
                       nil];

NSArray *itemDicts = nil;
OSStatus status = SecItemCopyMatching((CFDictionaryRef)query, (CFTypeRef *)&itemDicts);
if (status)
    [MessageBox Show:(NSString*)SecCopyErrorMessageString(status, NULL)];

NSMutableArray *arr = [[NSMutableArray alloc] init];

for (NSDictionary *itemDict in itemDicts) {
    NSData *data    = [itemDict objectForKey:(id)kSecValueData];
    NSString *pwd   = [[[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding] autorelease];
    NSString *acc   = [itemDict objectForKey:(id)kSecAttrAccount];
    NSString *name  = [itemDict objectForKey:(id)kSecAttrLabel];

    if(acc != nil) {
        NSArray *values = [NSArray arrayWithObjects: (id)name, (id)acc, (id)pwd, nil];

        [arr addObject:(id)values];
    }
}
[itemDicts release];

NSInteger c     = arr.count;
NSString *cnt   = [NSString stringWithFormat:@"%d", c]; 
[MessageBox Show: [arr objectAtIndex:10]];