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Topic: OAuth2 - Login to IMAP failed

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romanovi4
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Joined: 13 April 2022
Location: Germany
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Posts: 8

Posted: 13 April 2022 at 1:13am \| IP Logged

Hi,

i use MailBee.Net Imap to access the Emails on Exchange/Office365-Server. The login command throws an exception: MBN00000002 NO AUTHENTICATE failed.

My code:
string xoauthKey = OAuth2.GetXOAuthKeyStatic(null, authResult.AccessToken);
await tmpMailBeeImap.LoginAsync(email, xoauthKey, AuthenticationMethods.SaslOAuth2, AuthenticationOptions.None, null);

Log entries:
[10:05:14.70] [SEND] MBN00000001 CAPABILITY\r\n
[10:05:14.72] [RECV] * CAPABILITY IMAP4 IMAP4rev1 AUTH=PLAIN AUTH=XOAUTH2 SASL-IR UIDPLUS ID UNSELECT CHILDREN IDLE NAMESPACE LITERAL+\r\n [Total 115 bytes received.]
[10:05:14.72] [RECV] MBN00000001 OK CAPABILITY completed.\r\n [Total 38 bytes received.]
[10:05:14.73] [INFO] Connected to mail service at host "outlook.office365.com" on port 993 and ready.
[10:05:14.74] [INFO] Will login as "".
[10:05:14.74] [INFO] Will try SASL XOAUTH2 authentication method.
[10:05:14.75] [SEND] MBN00000002 AUTHENTICATE XOAUTH2\r\n
[10:05:14.78] [RECV] + \r\n [Total 4 bytes received.]
[10:05:14.79] [SEND] dXNlcGRDMk9yMHFRbmcBAQ==\r\n
[10:05:16.24] [RECV] MBN00000002 NO AUTHENTICATE failed.\r\n [Total 37 bytes received.]
[10:05:16.32] [INFO] Error: The server has rejected authentication data sent by the client. The server responded: MBN00000002 NO AUTHENTICATE failed.

What is wrong in my code.

The Mailbee.EWS works with OAUth2 fine.

Alex
AfterLogic Support

Joined: 19 November 2003
Online Status: Offline
Posts: 2206

Posted: 13 April 2022 at 1:25am \| IP Logged

Hi,

Access tokens can be specific to a particular protocol. EWS-compatible token may not work for IMAP or vice versa. And you'll need to have the corresponding permissions enabled in your OAuth2 app in Azure.

See OAuth 2.0 for Office 365 Accounts guide for details.

Regards,
Alex

romanovi4
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Joined: 13 April 2022
Location: Germany
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Posts: 8

Posted: 13 April 2022 at 5:41am \| IP Logged

Hi,

thank you for answer. The example works well in interactive way. But i need the implementation for a windows service without interaction with an user.

My code to get a access token:

var cca = ConfidentialClientApplicationBuilder
                      .Create(ClientId)
                      .WithClientSecret(ClientSecret)
                      .WithTenantId(tenantId)
                      .Build();

var ewsScopes = new string[] { "https://outlook.office365.com/.default" };
authResult = await cca.AcquireTokenForClient(ewsScopes).ExecuteAsync();

then imap connect and login.

Igor
AfterLogic Support

Joined: 24 June 2008
Location: United States
Online Status: Offline
Posts: 6104

Posted: 13 April 2022 at 6:02am \| IP Logged

Microsoft doesn't currently allow that:

Authenticate an IMAP, POP or SMTP connection using OAuth

Quote:

OAuth access to IMAP, POP, SMTP AUTH protocols via OAuth2 client credentials grant flow is not supported.

However, you should be able to use either EWS or Graph API for accessing mailbox, see the respective articles in MailBee.NET Objects Developer's blog:

Using MailBee.NET EWS to access Office 365 mailbox in non-interactive case
Using Graph API to access Office 365 mailbox in non-interactive case

--
Regards,
Igor, Afterlogic Support

romanovi4
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Joined: 13 April 2022
Location: Germany
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Posts: 8

Posted: 09 August 2022 at 2:21am \| IP Logged

Hello,

Microsoft supported now the client credentials flow for IMAP. Is this feature already supported in actually MailBee or should i wait for new release?

https://www.microsoft.com/en-us/microsoft-365/roadmap?filters=&searchterms=70577

Regards,
Roman

Alex
AfterLogic Support

Joined: 19 November 2003
Online Status: Offline
Posts: 2206

Posted: 09 August 2022 at 2:30am \| IP Logged

Hello,

It's supported automatically because MailBee does not deal with generating tokens at all. It only consumes them. You create a token with a provider-specific API and feed it to MailBee. So if the provider-specific API now allows you to get the token in a new way, you can adapt your code which gets the token. The rest (when you pass this token to MailBee) stays the same.

Regards,
Alex

romanovi4
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Joined: 13 April 2022
Location: Germany
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Posts: 8

Posted: 31 August 2022 at 2:41am \| IP Logged

Hello,

the authentication on Office365 via OAuth2 using the client credentials flow works.

But a MessageStatus-event does not come from the server when a new email arrives in the mailbox. Idling event is thrown regularly. Only when idling stopped then throws the MessageStatus-Events. As if event is being blocked by something....

What can it be?

Alex
AfterLogic Support

Joined: 19 November 2003
Online Status: Offline
Posts: 2206

Posted: 31 August 2022 at 3:23am \| IP Logged

Hi,

Hard to say what could go wrong there but after some googling I can say you're not alone with IDLE problem there. I've seen reports it stopped working recently.

E.g. (last post in this topic says it stopped working this month):

https://stackoverflow.com/questions/73411037/imap-idle-is-not-returning-any-information-despite-new-emails-whilst-running

That's all I can say now.

Regards,
Alex

phlexss
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Joined: 05 September 2022
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Posts: 6

Posted: 06 September 2022 at 12:03am \| IP Logged

romanovi4 wrote:

How did you get credentials flow to work? What code do you use?

romanovi4
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Joined: 13 April 2022
Location: Germany
Online Status: Offline
Posts: 8

Posted: 12 September 2022 at 2:42am \| IP Logged

In Windows form application on button click i start the task and in the task i run the following code:

private void StartIdle()
{
     this.isActive = true;
     Task.Run(async () => {
          try
          {

               MailBee.Global.LicenseKey = MailBeeGlobalLicenseKey;
               this.mailBeeImapIdle = new MailBee.ImapMail.Imap();
               this.mailBeeImapIdle.Connected += MailBeeImapIdle_Connected;
               this.mailBeeImapIdle.Disconnected += MailBeeImapIdle_Disconnected;

               await this.mailBeeImapIdle.ConnectAsync("outlook.office365.com", 993);
               if (this.mailBeeImapIdle.GetExtension("IDLE") == null)
               {
                    return;
               }

               if (this.cca == null)
               {
                    this.cca = ConfidentialClientApplicationBuilder
                         .Create(this.txtApplicationID.Text)
                         .WithClientSecret(this.txtSecretKey.Text)
                         .WithTenantId(this.txtTenant.Text)
                         .Build();

               }
               string accessToken = this.GetToken();
               string xoauthKey = OAuth2.GetXOAuthKeyStatic(this.txtEmailAddress.Text, accessToken);
               await this.mailBeeImapIdle.LoginAsync(null, xoauthKey, AuthenticationMethods.SaslOAuth2, AuthenticationOptions.None, null);

               this.mailBeeImapIdle.SelectFolder("INBOX");
               this.mailBeeImapIdle.Idling += MailBeeImapIdle_Idling;
               this.mailBeeImapIdle.MessageStatus += MailBeeImapIdle_MessageStatus;

               while (this.isActive)
               {
                    MailBee.ImapMail.UidCollection uids = (MailBee.ImapMail.UidCollection)await this.mailBeeImapIdle.SearchAsync(true, "unseen", null);
                    if (uids.Count > 0)
                    {
                         MailBee.Mime.MailMessageCollection msgs = await this.mailBeeImapIdle.DownloadEntireMessagesAsync(uids.ToString(), true);
                         foreach (MailBee.Mime.MailMessage msg in msgs)
                         {
                              this.mailBeeImapIdle .SetMessageFlags(msg.UidOnServer.ToString(), true, MailBee.ImapMail.SystemMessageFlags.Seen, MailBee.ImapMail.MessageFlagAction.Add);
                         }
                    }
                    TimerStart();
                    await this.mailBeeImapIdle.IdleAsync();
               }
          }
          catch (Exception ex)
          {
               await this.StopIdleAsync();
          }
     });
}

private string GetToken()
{
     var authResult = this.cca.AcquireTokenForClient(ewsScopes).ExecuteAsync().Result;
     return authResult.AccessToken;
}

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