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(DataFlex) Get TLS Server's SPKI FingerprintGets the SPKI fingerprint of a TLS server. Pinning is the process of associating a host with their expected X509 certificate or public key. Once a certificate or public key is known or seen for a host, the certificate or public key is associated or 'pinned' to the host. If more than one certificate or public key is acceptable, then the program holds a pinset. In this case, the advertised identity must match one of the elements in the pinset. A host or service's certificate or public key can be added to an application at development time, or it can be added upon first encountering the certificate or public key. The former - adding at development time - is preferred since preloading the certificate or public key out of band usually means the attacker cannot taint the pin. .. Beginning in Chilkat v9.5.0.55, TLS public key pinning is implemented by (1) making it possible to easily get the SPKI fingerprint of a certificate, and (2) adding the TlsPinSet property to classes that can establish TLS connections.
Use ChilkatAx-win32.pkg Procedure Test Handle hoTlsSock Boolean iBConnectUsingTls Integer iMaxWaitMs Boolean iSuccess Variant vCert Handle hoCert String sTemp1 Boolean bTemp1 // This example requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. Get Create (RefClass(cComChilkatSocket)) To hoTlsSock If (Not(IsComObjectCreated(hoTlsSock))) Begin Send CreateComObject of hoTlsSock End // Establish a TLS connection with any remote TLS server. // The type of server could be anything: HTTP, IMAP, SMTP, FTP, POP3, etc. // as long as it is TLS (i.e. it connects implicitly using TLS). Move True To iBConnectUsingTls Move 5000 To iMaxWaitMs Get ComConnect Of hoTlsSock "imap.gmail.com" 993 iBConnectUsingTls iMaxWaitMs To iSuccess If (iSuccess <> True) Begin Get ComLastErrorText Of hoTlsSock To sTemp1 Showln sTemp1 Procedure_Return End // Get the server certificate. Get ComGetSslServerCert Of hoTlsSock To vCert If (IsComObject(vCert)) Begin Get Create (RefClass(cComChilkatCert)) To hoCert Set pvComObject Of hoCert To vCert End Get ComLastMethodSuccess Of hoTlsSock To bTemp1 If (bTemp1 = False) Begin Get ComLastErrorText Of hoTlsSock To sTemp1 Showln sTemp1 Procedure_Return End // The GetSpkiFingerprint method returns the SPKI Fingerprint suitable for use in pinning. // (See RFC 7469.) An SPKI Fingerprint is defined as the output of a known cryptographic hash // algorithm whose input is the DER-encoded ASN.1 representation of the Subject Public Key Info // (SPKI) of an X.509 certificate. The first argument specifies the hash algorithm and may be // "sha256", "sha384", "sha512", "sha1", "md2", "md5", "haval", "ripemd128", // "ripemd160","ripemd256", or "ripemd320". // The second argument specifies the encoding, and may be "base64", "hex", // or any of the encoding modes specified at http://www.cknotes.com/chilkat-binary-encoding-list/ // DN = "Distinguished Name" Get ComGetSpkiFingerprint Of hoCert "sha256" "base64" To sTemp1 Showln "SPKI Fingerprint: " sTemp1 Send Destroy of hoCert End_Procedure |
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