ios - 替换 iOS 15 中已弃用的 `SecTrustGetCertificateAtIndex`？

Question

我在 iOS 15 中收到弃用警告SDK，但建议的替换不是一对一的替换。这是我用于评估 SSL 信任链的内容:

func valid(_ trust: SecTrust, forHost host: String) -> Bool {
    guard valid(trust, for: [SecPolicyCreateSSL(true, nil)]),
        valid(trust, for: [SecPolicyCreateSSL(true, host as CFString)]) else {
            return false
    }

    let serverCertificatesData = Set(
        (0..<SecTrustGetCertificateCount(trust))
            .compactMap { SecTrustGetCertificateAtIndex(trust, $0) }
            .map { SecCertificateCopyData($0) as Data }
    )

    let pinnedCertificatesData = Set(
        certificates.map { SecCertificateCopyData($0) as Data }
    )

    return !serverCertificatesData.isDisjoint(with: pinnedCertificatesData)
}

我在 Xcode 13 beta 中收到的警告是:

'SecTrustGetCertificateAtIndex' was deprecated in iOS 15.0: renamed to 'SecTrustCopyCertificateChain(_:)'. 
Use 'SecTrustCopyCertificateChain(_:)' instead.

然而， SecTrustGetCertificateAtIndex ( docs ) 返回 SecCertificate哪里 SecTrustCopyCertificateChain ( docs ) 返回 CFArray .如何在我提供的用法中正确更新？

Answer 1

iOS 14.5 => iOS 15 SDK Diff表示唯一的添加是这些( 自 Xcode 13 Beta 1 )

SecBase.h
Added errSecInvalidCRLAuthority
Added errSecInvalidTupleCredentials
Added errSecCertificateDuplicateExtension

SecTrust.h
Added SecTrustCopyCertificateChain()

他们没有向 SecCertificate 添加任何新的兄弟类型.正如您已经注意到的，它返回一个 CFArray .

func SecTrustCopyCertificateChain(_ trust: SecTrust) -> CFArray?

所以对于这部分代码 -

let serverCertificatesData = Set(
    (0..<SecTrustGetCertificateCount(trust))
        .compactMap { SecTrustGetCertificateAtIndex(trust, $0) }
        .map { SecCertificateCopyData($0) as Data }
)

看来值得一试 SecTrustCopyCertificateChain可能会返回 CFArray的 SecCertificate实例？不幸的是，我现在无法调试它。
也许尝试这样的事情 -

if let certificates = SecTrustCopyCertificateChain(trust) as? [SecCertificate] {
    let serverCertificatesData = Set(
        certificates.map { SecCertificateCopyData($0) as Data }
    )
}