c—使用SecItemImport导入PKCS12

Question

苹果的OS X文档谈到使用SecItemImport来获得SecKeyRef。函数签名如下所示:

OSStatus SecItemImport (
   CFDataRef importedData,
   CFStringRef fileNameOrExtension,
   SecExternalFormat *inputFormat,
   SecExternalItemType *itemType,
   SecItemImportExportFlags flags,
   const SecItemImportExportKeyParameters *keyParams,
   SecKeychainRef importKeychain,
   CFArrayRef *outItems
);

下面的代码将尝试加载包含单个RSA密钥的PKCS12字节数组:

#include <Security/Security.h>
#include <Security/SecKey.h>
#include <CoreFoundation/CoreFoundation.h>
int main(void) {
    CFArrayRef array = NULL;
    SecItemImportExportKeyParameters params;
    SecExternalItemType itemType = kSecItemTypeUnknown;
    SecExternalFormat format = kSecFormatUnknown;
    params.flags = kSecKeyNoAccessControl;
    UInt8 bytes[] = {
        0x30, 0x82, 0x2, 0x1e, 0x2, 0x1, 0x3, 0x30, 0x82, 0x1, 0xe8, 0x6, 0x9, 0x2a, 0x86, 0x48, 0x86, 0xf7,
        0xd, 0x1, 0x7, 0x1, 0xa0, 0x82, 0x1, 0xd9, 0x4, 0x82, 0x1, 0xd5, 0x30, 0x82, 0x1, 0xd1, 0x30, 0x82,
        0x1, 0xcd, 0x6, 0x9, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0xd, 0x1, 0x7, 0x1, 0xa0, 0x82, 0x1, 0xbe, 0x4,
        0x82, 0x1, 0xba, 0x30, 0x82, 0x1, 0xb6, 0x30, 0x82, 0x1, 0xb2, 0x6, 0xb, 0x2a, 0x86, 0x48, 0x86,
        0xf7, 0xd, 0x1, 0xc, 0xa, 0x1, 0x2, 0xa0, 0x82, 0x1, 0x86, 0x30, 0x82, 0x1, 0x82, 0x30, 0x1c, 0x6,
        0xa, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0xd, 0x1, 0xc, 0x1, 0x3, 0x30, 0xe, 0x4, 0x8, 0x8f, 0x14, 0x15,
        0x85, 0x8e, 0x1c, 0x64, 0x6c, 0x2, 0x2, 0x8, 0x0, 0x4, 0x82, 0x1, 0x60, 0x86, 0x44, 0x55, 0x7e, 0xa3,
        0xce, 0x63, 0xb0, 0x83, 0xf6, 0x34, 0xb8, 0x88, 0xe3, 0x6e, 0xbf, 0x7e, 0xcb, 0xe7, 0x4f, 0x57, 0xde,
        0xaa, 0x4f, 0x28, 0xaa, 0x38, 0x6f, 0xc0, 0xd2, 0xcc, 0xc9, 0x95, 0x1b, 0x69, 0x2c, 0x7b, 0x78, 0xdf,
        0x77, 0xd7, 0xb3, 0x30, 0xe6, 0x3f, 0x6f, 0xaa, 0xe2, 0x68, 0x2e, 0x50, 0x28, 0x97, 0x16, 0x1d, 0xb8,
        0x7a, 0x26, 0x80, 0x57, 0x15, 0xf5, 0xe5, 0xce, 0x45, 0xed, 0x99, 0x68, 0x4f, 0x87, 0x97, 0x7c, 0xa0,
        0x19, 0xaf, 0x41, 0xf4, 0xcb, 0xdb, 0x2b, 0xd5, 0x42, 0xac, 0x9c, 0x50, 0x63, 0xd5, 0x1f, 0x5c, 0x1b,
        0x32, 0x1d, 0x3a, 0x77, 0x14, 0x78, 0x97, 0xe4, 0x38, 0xc2, 0x18, 0x9b, 0x5f, 0xa4, 0xf1, 0xec, 0xe0,
        0xd3, 0xc4, 0x7d, 0xcb, 0x25, 0x7, 0xd4, 0x68, 0x8b, 0x6d, 0x1d, 0x68, 0xa6, 0x8d, 0xf7, 0xf3, 0x63,
        0xf6, 0x6f, 0x5c, 0x8e, 0xed, 0x13, 0xdd, 0x11, 0xd7, 0x9, 0xe8, 0x6b, 0xda, 0x12, 0x44, 0x75, 0x15,
        0x82, 0xfa, 0xf6, 0xa1, 0x92, 0x54, 0x81, 0x9a, 0xa8, 0x4b, 0x21, 0x69, 0x8c, 0xc7, 0xba, 0x3e, 0x59,
        0xb6, 0x5b, 0x3, 0x50, 0xad, 0xd5, 0x6e, 0x9e, 0x11, 0x85, 0x12, 0x28, 0x6b, 0xf6, 0x4e, 0xbe, 0xaf,
        0xac, 0x9b, 0xee, 0x41, 0xf1, 0x3c, 0x36, 0xd9, 0xed, 0x4b, 0x68, 0x5e, 0x17, 0x88, 0xe5, 0xc2, 0x51,
        0x25, 0x19, 0xa4, 0xda, 0x1b, 0xb8, 0xec, 0xe2, 0x16, 0x42, 0xb1, 0x43, 0x32, 0x83, 0x89, 0x7a, 0xf3,
        0x3e, 0xee, 0x45, 0x18, 0x98, 0xb7, 0xe0, 0x23, 0xe4, 0x59, 0x58, 0x89, 0xa7, 0xf3, 0x50, 0x43, 0x3e,
        0xa7, 0xf9, 0xf, 0x89, 0x6c, 0xd1, 0xb3, 0xd7, 0xc7, 0x61, 0xa9, 0x75, 0x72, 0x52, 0x8a, 0xc0, 0x17,
        0x60, 0xbc, 0x26, 0x51, 0xec, 0x0, 0x46, 0xdb, 0x98, 0x41, 0xa0, 0x18, 0x7b, 0x2f, 0x11, 0xde, 0xb5,
        0xdc, 0xa4, 0x63, 0xbc, 0x93, 0x93, 0xcc, 0x98, 0x90, 0x74, 0xcb, 0xf6, 0xa, 0xe5, 0x99, 0x66, 0xd6,
        0x40, 0x81, 0x3, 0x7a, 0x40, 0x8, 0xa9, 0x42, 0x6, 0x53, 0xbe, 0x2c, 0x3a, 0x82, 0xe2, 0x9a, 0x62, 0x5a,
        0x1b, 0xb6, 0x3f, 0xd7, 0x10, 0x7f, 0x57, 0x0, 0xdb, 0x29, 0x8d, 0x4d, 0xe8, 0x9c, 0x70, 0x86, 0x66,
        0x78, 0x7b, 0x96, 0xba, 0xef, 0xb4, 0x4c, 0x30, 0x20, 0x97, 0x25, 0x5d, 0xf6, 0xff, 0x9d, 0x97, 0x60,
        0x34, 0x58, 0x2e, 0x6a, 0xf7, 0x12, 0x9f, 0x3b, 0x77, 0x2e, 0x3e, 0x43, 0x75, 0x97, 0x73, 0xf6, 0x53,
        0x0, 0x9b, 0x74, 0x34, 0xf4, 0xec, 0x31, 0x19, 0x30, 0x17, 0x6, 0x9, 0x2a, 0x86, 0x48, 0x86, 0xf7,
        0xd, 0x1, 0x9, 0x14, 0x31, 0xa, 0x1e, 0x8, 0x0, 0x6e, 0x0, 0x61, 0x0, 0x6d, 0x0, 0x65, 0x30, 0x2d,
        0x30, 0x21, 0x30, 0x9, 0x6, 0x5, 0x2b, 0xe, 0x3, 0x2, 0x1a, 0x5, 0x0, 0x4, 0x14, 0x95, 0x9, 0x91,
        0xf7, 0x6c, 0x7f, 0x35, 0x99, 0x64, 0xfc, 0x3e, 0x5e, 0xcf, 0xb6, 0x24, 0x8a, 0xc, 0x54, 0x44, 0xc6,
        0x4, 0x8, 0xfe, 0xe0, 0xe7, 0xbb, 0x72, 0xe1, 0xc9, 0x97
    };
    FILE* file = fopen( "test.p12", "wb" );
    fwrite( bytes, sizeof(UInt8), sizeof(bytes)/sizeof(UInt8), file );
    params.passphrase = CFStringCreateWithCString(kCFAllocatorDefault, "pass", kCFStringEncodingASCII);
    CFDataRef dataref = CFDataCreate(kCFAllocatorDefault, bytes, sizeof(bytes)/sizeof(bytes[0]));
    OSStatus res = SecItemImport(dataref, CFSTR(".p12"), &format, &itemType, 0, &params, NULL, &array);
    printf("response: %dn", res);
    printf("format: %dn", format);
    printf("itemType: %dn", itemType);
    printf("count: %ldn", CFArrayGetCount(array));
}

要编译上面的代码，可以使用clang filename.c -framework Security -framework CoreFoundation。

此代码没有返回错误(OSStatus 0)，但无法用解析的SecKeyRef填充数组。我已经尝试了相当多的不同的标志，但还没有能够让它返回所需的数据。有人知道我哪里做错了吗?

Answer 1

这看起来真的像一个Keychain漏洞。这并不令人震惊;Keychain有很多没有处理好的小角落案例。我会打开雷达(bugreport.apple.com)。一些附加说明:

PKCS12通常用于存储证书和私钥。您只是导入了一个裸私钥。我敢打赌它没有经过很好的测试，尽管它声称支持:

注意:当导入PKCS12 blob时，通常在outitem中返回一个SecIdentityRef对象和零个或多个额外的SecCertificateRef对象。除非在传入的blob中找到一个没有匹配证书的密钥，否则不会返回任何SecKeyRef对象。

我很好奇，如果有一个证书，这是否会工作。

我已经尝试了这个代码与一个钥匙链(创建与SecKeychainCreate)。生成的keychain可以被keychain Access读取，并且包含私钥，因此导入是有效的。

我尝试使用所有相同的代码作为SecPKCS12Import，但它返回相同的结果。例如，我确保memset()的参数结构，你的代码应该，但没有。

作为一个无关紧要的点，你泄露了密码短语。您应该在这里使用CFSTR()来传递常量字符串