bypass invalid SSL certificate in net core

Question

I am working on a project that needs to connect to an https site  Every time I connect  my code throws exception because the certificate of that site comes from untrusted site   Is there a way to bypass certificate check in  net core http   I saw this code from previous version of  NET  I guess I just need something like this    ServicePointManager ServerCertificateValidationCallback     sender  cert  chain  sslPolicyErrors    gt  true

User · Answer

I solve with this   Startup cs  public void ConfigureServices IServiceCollection services                services AddHttpClient  HttpClientWithSSLUntrusted   ConfigurePrimaryHttpMessageHandler      gt  new HttpClientHandler                       ClientCertificateOptions   ClientCertificateOption Manual              ServerCertificateCustomValidationCallback                httpRequestMessage  cert  cetChain  policyErrors    gt                                return true                              YourService cs  public UserService IHttpClientFactory clientFactory  IOptions lt AppSettings gt  appSettings                 appSettings   appSettings Value           clientFactory   clientFactory         var request   new HttpRequestMessage      var client    clientFactory CreateClient  HttpClientWithSSLUntrusted     HttpResponseMessage response   await client SendAsync request

User · Answer

In  NetCore  you can add the following code snippet at services configure method   I added a check to make sure only that we by pass the SSL certificate in development environment only   services AddHttpClient  HttpClientName   client   gt       code to configure headers etc      ConfigurePrimaryHttpMessageHandler      gt                      var handler   new HttpClientHandler                      if  hostingEnvironment IsDevelopment                                              handler ServerCertificateCustomValidationCallback    message  cert  chain  errors    gt    return true                                           return handler

User · Answer

I faced off the same problem when working with self-signed certs and client cert auth on  NET Core 2 2 and Docker Linux containers  Everything worked fine on my dev Windows machine  but in Docker I got such error      System Security Authentication AuthenticationException  The remote certificate is invalid according to the validation procedure   Fortunately  the certificate was generated using a chain  Of course  you can always ignore this solution and use the above solutions   So here is my solution    I saved the certificate using Chrome on my computer in P7B format   Convert certificate to PEM format using this command  openssl pkcs7 -inform DER -outform PEM -in  lt cert gt  p7b -print certs  gt  ca bundle crt Open the ca bundle crt file and delete all Subject recordings  leaving a clean file  Example below        -----BEGIN CERTIFICATE-----      BASE64 DATA      -----END CERTIFICATE-----     -----BEGIN CERTIFICATE-----      BASE64 DATA      -----END CERTIFICATE-----     -----BEGIN CERTIFICATE-----      BASE64 DATA      -----END CERTIFICATE-----    Put these lines to the Dockerfile  in the final steps           Update system and install curl and ca-certificates     RUN apt-get update  amp  amp  apt-get install -y curl  amp  amp  apt-get install -y ca-certificates       Copy your bundle file to the system trusted storage     COPY   ca bundle crt  usr local share ca-certificates ca bundle crt       During docker build  after this line you will get such output  1 added  0 removed  done      RUN update-ca-certificates    In the app        var address   new EndpointAddress  https   serviceUrl                        var binding   new BasicHttpsBinding               CloseTimeout   new TimeSpan 0  1  0           OpenTimeout   new TimeSpan 0  1  0           ReceiveTimeout   new TimeSpan 0  1  0           SendTimeout   new TimeSpan 0  1  0           MaxBufferPoolSize   524288          MaxBufferSize   65536          MaxReceivedMessageSize   65536          TextEncoding   Encoding UTF8          TransferMode   TransferMode Buffered          UseDefaultWebProxy   true          AllowCookies   false          BypassProxyOnLocal   false          ReaderQuotas   XmlDictionaryReaderQuotas Max          Security                         Mode   BasicHttpsSecurityMode Transport              Transport   new HttpTransportSecurity                               ClientCredentialType   HttpClientCredentialType Certificate                  ProxyCredentialType   HttpProxyCredentialType None                                    var client   new MyWSClient binding  address       client ClientCredentials ClientCertificate Certificate   GetClientCertificate  clientCert pfx    passwordForClientCert           Client certs must be installed     client ClientCredentials ServiceCertificate SslCertificateAuthentication   new X509ServiceCertificateAuthentication               CertificateValidationMode   X509CertificateValidationMode ChainTrust          TrustedStoreLocation   StoreLocation LocalMachine          RevocationMode   X509RevocationMode NoCheck          GetClientCertificate method   private static X509Certificate2 GetClientCertificate string clientCertName  string password          Create X509Certificate2 object from  pfx file     byte   rawData   null      using  var f   new FileStream Path Combine AppContext BaseDirectory  clientCertName   FileMode Open  FileAccess Read                 var size    int f Length          var rawData   new byte size           f Read rawData  0  size           f Close              return new X509Certificate2 rawData  password

User · Answer

Allowing all certificates is very powerful but it could also be dangerous  If you would like to only allow valid certificates plus some certain certificates it could be done like this   using  var httpClientHandler   new HttpClientHandler          httpClientHandler ServerCertificateCustomValidationCallback    message  cert  chain  sslPolicyErrors    gt            if  sslPolicyErrors    SslPolicyErrors None                        return true      Is valid                    if  cert GetCertHashString       99E92D8447AEF30483B1D7527812C9B7B3A915A7                         return true                    return false             using  var httpClient   new HttpClient httpClientHandler                 var httpResponse   httpClient GetAsync  https   example com   Result            Original source   https   stackoverflow com a 44140506 3850405

User · Answer

Firstly  DO NOT USE IT IN PRODUCTION  If you are using AddHttpClient middleware this will be usefull  I think it is needed for development purpose not production  Until you create a valid certificate you could use this Func   Func lt HttpMessageHandler gt  configureHandler        gt                        var bypassCertValidation   Configuration GetValue lt bool gt   BypassRemoteCertificateValidation                var handler   new HttpClientHandler                   DO NOT DO IT IN PRODUCTION   GO AND CREATE VALID CERTIFICATE              if  bypassCertValidation                                handler ServerCertificateCustomValidationCallback    httpRequestMessage  x509Certificate2  x509Chain  sslPolicyErrors    gt                                        return true                                               return handler               and apply it like  services AddHttpClient lt IMyClient  MyClient gt  x   gt    x BaseAddress   new Uri  https   localhost 5005                ConfigurePrimaryHttpMessageHandler configureHandler

User · Answer

ServicePointManager ServerCertificateValidationCallback isn t supported in  Net Core   Current situation is that it will be a  a new ServerCertificateCustomValidationCallback  method for the upcoming 4 1   System Net Http contract  HttpClient    NET Core team are finalizing the 4 1 contract now  You can read about this in here on github  You can try out the pre-release version of System Net Http 4 1 by using the sources directly here in CoreFx or on the MYGET feed  https   dotnet myget org gallery dotnet-core  Current WinHttpHandler ServerCertificateCustomValidationCallback definition on Github

User · Answer

Came here looking for an answer to the same problem  but I m using WCF for NET Core  If you re in the same boat  use   client ClientCredentials ServiceCertificate SslCertificateAuthentication        new X509ServiceCertificateAuthentication                 CertificateValidationMode   X509CertificateValidationMode None          RevocationMode   X509RevocationMode NoCheck

User · Answer

Update   As mentioned below  not all implementations support this callback  i e  platforms like iOS   In this case  as the docs say  you can set the validator explicitly    handler ServerCertificateCustomValidationCallback   HttpClientHandler DangerousAcceptAnyServerCertificateValidator    This works too for  NET Core 2 2  3 0 and 3 1  Old answer  with more control but may throw PlatformNotSupportedException   You can override SSL cert check on a HTTP call with the a anonymous callback function like this  using  var httpClientHandler   new HttpClientHandler         httpClientHandler ServerCertificateCustomValidationCallback    message  cert  chain  errors    gt    return true        using  var client   new HttpClient httpClientHandler                  Make your request             Additionally  I suggest to use a factory pattern for HttpClient because it is a shared object that might no be disposed immediately and therefore connections will stay open

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