检查网站的TLS版本 有时候需要知道某个网站支持的TLS的版本。现在SSL 2.0和SSL 3.0都
已经被淘汰了。其中TLS 1.0，TLS 1.1，
有时候需要知道某个网站支持的TLS的版本。现在SSL 2.0和SSL 3.0都已经被淘汰了。其中TLS 1.0，TLS 1.1，TLS 1.2是目前的的主流，相对也是安全的。主要看加密的算法。TLS 1.3是目前最新的协议版本，也是相对最安全的版本了。
openssl s_client -connect www.baidu.com:443 -tls1_2
openssl s_client -connect www.baidu.com:443 -tls1_1
openssl s_client -connect www.baidu.com:443 -tls1
以上分别检查了tls1.2,tls1.1和 tls1。如果握手失败的话，那么就是不支持了。
依赖于 nmap
nmap --script ssl-enum-ciphers -p 443 baidu.com
结果如下：
Starting Nmap 7.91 ( https://nmap.org ) at 2020-11-29 09:51 CST
Nmap scan report for baidu.com (39.156.69.79)
Host is up (0.0068s latency).
Other addresses for baidu.com (not scanned): 220.181.38.148
PORT STATE SERVICE
443/tcp open https
| ssl-enum-ciphers:
| SSLv3:
| ciphers:
| TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - C
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - C
| compressors:
| NULL
| cipher preference: server
| warnings:
| Broken cipher RC4 is deprecated by RFC 7465
| CBC-mode cipher in SSLv3 (CVE-2014-3566)
| TLSv1.0:
| ciphers:
| TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - C
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - C
| compressors:
| NULL
| cipher preference: server
| warnings:
| Broken cipher RC4 is deprecated by RFC 7465
| TLSv1.1:
| ciphers:
| TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - C
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - C
| compressors:
| NULL
| cipher preference: server
| warnings:
| Broken cipher RC4 is deprecated by RFC 7465
| TLSv1.2:
| ciphers:
| TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_RC4_128_SHA (secp256r1) - C
| TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (secp256r1) - A
| TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (secp256r1) - A
| TLS_RSA_WITH_AES_128_GCM_SHA256 (rsa 2048) - A
| TLS_RSA_WITH_AES_256_GCM_SHA384 (rsa 2048) - A
| TLS_RSA_WITH_AES_128_CBC_SHA256 (rsa 2048) - A
| TLS_RSA_WITH_AES_128_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA256 (rsa 2048) - A
| TLS_RSA_WITH_AES_256_CBC_SHA (rsa 2048) - A
| TLS_RSA_WITH_RC4_128_SHA (rsa 2048) - C
| compressors:
| NULL
| cipher preference: server
| warnings:
| Broken cipher RC4 is deprecated by RFC 7465
|_ least strength: C
Nmap done: 1 IP address (1 host up) scanned in 3.22 seconds
可以用如下的函数，来源：Test web server SSL/TLS protocol support with PowerShell - PKI Extensions
function Test-ServerSSLSupport {
[CmdletBinding()]
param(
[Parameter(Mandatory = $true, ValueFromPipeline = $true)]
[ValidateNotNullOrEmpty()]
[string]$HostName,
[UInt16]$Port = 443
)
process {
$RetValue = New-Object psobject -Property @{
Host = $HostName
Port = $Port
SSLv2 = $false
SSLv3 = $false
TLSv1_0 = $false
TLSv1_1 = $false
TLSv1_2 = $false
KeyExhange = $null
HashAlgorithm = $null
}
"ssl2", "ssl3", "tls", "tls11", "tls12" | %{
$TcpClient = New-Object Net.Sockets.TcpClient
$TcpClient.Connect($RetValue.Host, $RetValue.Port)
$SslStream = New-Object Net.Security.SslStream $TcpClient.GetStream(),
$true,
([System.Net.Security.RemoteCertificateValidationCallback]{ $true })
$SslStream.ReadTimeout = 15000
$SslStream.WriteTimeout = 15000
try {
$SslStream.AuthenticateAsClient($RetValue.Host,$null,$_,$false)
$RetValue.KeyExhange = $SslStream.KeyExchangeAlgorithm
$RetValue.HashAlgorithm = $SslStream.HashAlgorithm
$status = $true
} catch {
$status = $false
}
switch ($_) {
"ssl2" {$RetValue.SSLv2 = $status}
"ssl3" {$RetValue.SSLv3 = $status}
"tls" {$RetValue.TLSv1_0 = $status}
"tls11" {$RetValue.TLSv1_1 = $status}
"tls12" {$RetValue.TLSv1_2 = $status}
}
# dispose objects to prevent memory leaks
$TcpClient.Dispose()
$SslStream.Dispose()
}
$RetValue
}
}
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