(SQL Server) IMAP Download and Verify Signed MIME

Downloads the unmodified MIME of a digitally signed email, saves the .p7s signature (and other MIME parts), then loads the email into a Chilkat email object (which unwraps the S/MIME and verifies the signature) and then saves attachments (if the MIME parts were not already saved).

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    DECLARE @iTmp0 int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    -- This example requires the Chilkat API to have been previously unlocked.
    -- See Global Unlock Sample for sample code.

    DECLARE @imap int
    -- Use "Chilkat_9_5_0.Imap" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Imap', @imap OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    -- Connect to an IMAP server.
    -- Use TLS
    EXEC sp_OASetProperty @imap, 'Ssl', 1
    EXEC sp_OASetProperty @imap, 'Port', 993
    DECLARE @success int
    EXEC sp_OAMethod @imap, 'Connect', @success OUT, 'imap.someMailServer.com'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    EXEC sp_OAMethod @imap, 'Login', @success OUT, 'myLogin', 'myPassword'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Select an IMAP mailbox
    EXEC sp_OAMethod @imap, 'SelectMailbox', @success OUT, 'Inbox'
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Download the 1st email (as MIME) in the Inbox by sequence number.
    DECLARE @sbMime int
    -- Use "Chilkat_9_5_0.StringBuilder" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sbMime OUT

    EXEC sp_OAMethod @imap, 'FetchSingleAsMimeSb', @success OUT, 1, 0, @sbMime
    IF @success <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        EXEC @hr = sp_OADestroy @sbMime
        RETURN
      END

    -- Load it into a MIME object and check to see if it is signed
    DECLARE @mime int
    -- Use "Chilkat_9_5_0.Mime" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Mime', @mime OUT

    EXEC sp_OAMethod @mime, 'LoadMimeSb', @success OUT, @sbMime
    DECLARE @alreadySavedParts int
    SELECT @alreadySavedParts = 0
    EXEC sp_OAMethod @mime, 'ContainsSignedParts', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN

        -- This will save the .p7s and other parts...
        DECLARE @sa int
        EXEC sp_OAMethod @mime, 'ExtractPartsToFiles', @sa OUT, 'qa_output'
        EXEC sp_OAGetProperty @mime, 'LastMethodSuccess', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN
            DECLARE @numFiles int
            EXEC sp_OAGetProperty @sa, 'Count', @numFiles OUT
            DECLARE @i int
            SELECT @i = 0
            WHILE @i < @numFiles
              BEGIN

                EXEC sp_OAMethod @sa, 'GetString', @sTmp0 OUT, @i
                PRINT 'Created: ' + @sTmp0
                SELECT @i = @i + 1
              END
            EXEC @hr = sp_OADestroy @sa

            SELECT @alreadySavedParts = 1
          END
      END

    -- Load the MIME into an Email object.  This unwraps the security layers and verifies signatures.
    DECLARE @email int
    -- Use "Chilkat_9_5_0.Email" for versions of Chilkat < 10.0.0
    EXEC @hr = sp_OACreate 'Chilkat.Email', @email OUT

    EXEC sp_OAMethod @email, 'SetFromMimeSb', @success OUT, @sbMime

    EXEC sp_OAGetProperty @email, 'ReceivedSigned', @iTmp0 OUT
    IF @iTmp0 = 1
      BEGIN


        PRINT 'This email was signed.'

        -- Check to see if the signatures were verified.
        EXEC sp_OAGetProperty @email, 'SignaturesValid', @iTmp0 OUT
        IF @iTmp0 = 1
          BEGIN

            PRINT 'Digital signature(s) verified.'


            EXEC sp_OAGetProperty @email, 'SignedBy', @sTmp0 OUT
            PRINT 'Signer: ' + @sTmp0

            -- The certificate used for signing may be obtained
            -- by calling email.GetSignedByCert.
            DECLARE @cert int
            EXEC sp_OAMethod @email, 'GetSignedByCert', @cert OUT
            EXEC sp_OAGetProperty @email, 'LastMethodSuccess', @iTmp0 OUT
            IF @iTmp0 <> 1
              BEGIN

                PRINT 'Failed to get signing certificate object.'
              END
            ELSE
              BEGIN

                EXEC sp_OAGetProperty @cert, 'SubjectCN', @sTmp0 OUT
                PRINT 'Signing cert: ' + @sTmp0
                EXEC @hr = sp_OADestroy @cert

              END
          END

      END
    ELSE
      BEGIN

        PRINT 'Digital signature verification failed.'
      END

    IF @alreadySavedParts <> 1
      BEGIN
        EXEC sp_OAMethod @email, 'SaveAllAttachments', @success OUT, 'qa_output'
      END

    EXEC @hr = sp_OADestroy @imap
    EXEC @hr = sp_OADestroy @sbMime
    EXEC @hr = sp_OADestroy @mime
    EXEC @hr = sp_OADestroy @email


END
GO