(SQL Server) IMAP Download and Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

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

    -- We can choose to fetch UIDs or sequence numbers.
    DECLARE @fetchUids int
    SELECT @fetchUids = 1

    -- Get the message IDs of all the emails in the mailbox
    DECLARE @messageSet int
    EXEC sp_OAMethod @imap, 'Search', @messageSet OUT, 'ALL', @fetchUids
    EXEC sp_OAGetProperty @imap, 'LastMethodSuccess', @iTmp0 OUT
    IF @iTmp0 <> 1
      BEGIN
        EXEC sp_OAGetProperty @imap, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @imap
        RETURN
      END

    -- Scan for emails with attachments, and save the attachments
    -- to a sub-directory.
    DECLARE @i int
    SELECT @i = 0
    EXEC sp_OAGetProperty @messageSet, 'Count', @iTmp0 OUT
    WHILE @i < @iTmp0
      BEGIN

        DECLARE @uid nvarchar(4000)
        EXEC sp_OAMethod @messageSet, 'GetId', @uid OUT, @i

        PRINT 'uid: ' + @uid

        DECLARE @email int
        EXEC sp_OAMethod @imap, 'FetchSingle', @email OUT, @uid, 1

        -- The security layers of signed and/or encrypted emails
        -- are automatically "unwrapped" when loaded into
        -- a Chilkat email object.
        -- An application only needs to check to see if an email
        -- was received signed or encrypted, and then examine
        -- the success/failure.  For example:
        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
            ELSE
              BEGIN

                PRINT 'Digital signature verification failed.'
              END

          END
        EXEC @hr = sp_OADestroy @email

        SELECT @i = @i + 1
      END

    -- Disconnect from the IMAP server.
    EXEC sp_OAMethod @imap, 'Disconnect', @success OUT

    EXEC @hr = sp_OADestroy @messageSet


    EXEC @hr = sp_OADestroy @imap


END
GO