[Bug 1653506] [NEW] Not possible to connect to Ubuntu from remote device

[Konrad Zapałowicz]

Public bug reported:

The Ubuntu is not letting the remote device in in case when the remote
device is the initiator of the connection request. It drops connection
request on the L2CAP level with 'security block' error code.

The step-by-step example:

1. Ubuntu pairs & connects to remote device
2. Ubuntu disconnects
3. Remote device tries to reconnect

It is seen from the HCI trace that the root cause is the problem in
finding the agent that could carry the auth process on. In this case
however the agent has been registered previously.

The HCI trace:

> ACL Data RX: Handle 12 flags 0x02 dlen 12                                                                                                             [hci0] 941.214394
      L2CAP: Connection Request (0x02) ident 38 len 4
        PSM: 25 (0x0019)
        Source CID: 65
< ACL Data TX: Handle 12 flags 0x00 dlen 16                                                                                                             [hci0] 941.214473
      L2CAP: Connection Response (0x03) ident 38 len 8
        Destination CID: 64
        Source CID: 65
        Result: Connection pending (0x0001)
        Status: Authorization pending (0x0002)
= bluetoothd: Authentication attempt without agent                                                                                                      [hci0] 941.214871
= bluetoothd: Access denied: org.bluez.Error.Rejected                                                                                                          941.214921
< ACL Data TX: Handle 12 flags 0x00 dlen 16                                                                                                             [hci0] 941.214916
      L2CAP: Connection Response (0x03) ident 38 len 8
        Destination CID: 64
        Source CID: 65
        Result: Connection refused - security block (0x0003)
        Status: No further information available (0x0000)

** Affects: bluez (Ubuntu)
     Importance: Undecided
     Assignee: Konrad Zapałowicz (kzapalowicz)
         Status: New


** Tags: bluez

** Description changed:

  The Ubuntu is not letting the remote device in in case when the remote
- device is the initiator if the connection request. It drops connection
+ device is the initiator of the connection request. It drops connection
  request on the L2CAP level with 'security block' error code.
  
  The step-by-step example:
  
  1. Ubuntu pairs & connects to remote device
  2. Ubuntu disconnects
  3. Remote device tries to reconnect
  
  It is seen from the HCI trace that the root cause is the problem in
  finding the agent that could carry the auth process on. In this case
  however the agent has been registered previously.
  
  The HCI trace:
  
  > ACL Data RX: Handle 12 flags 0x02 dlen 12                                                                                                             [hci0] 941.214394
-       L2CAP: Connection Request (0x02) ident 38 len 4
-         PSM: 25 (0x0019)
-         Source CID: 65
+       L2CAP: Connection Request (0x02) ident 38 len 4
+         PSM: 25 (0x0019)
+         Source CID: 65
  < ACL Data TX: Handle 12 flags 0x00 dlen 16                                                                                                             [hci0] 941.214473
-       L2CAP: Connection Response (0x03) ident 38 len 8
-         Destination CID: 64
-         Source CID: 65
-         Result: Connection pending (0x0001)
-         Status: Authorization pending (0x0002)
+       L2CAP: Connection Response (0x03) ident 38 len 8
+         Destination CID: 64
+         Source CID: 65
+         Result: Connection pending (0x0001)
+         Status: Authorization pending (0x0002)
  = bluetoothd: Authentication attempt without agent                                                                                                      [hci0] 941.214871
  = bluetoothd: Access denied: org.bluez.Error.Rejected                                                                                                          941.214921
  < ACL Data TX: Handle 12 flags 0x00 dlen 16                                                                                                             [hci0] 941.214916
-       L2CAP: Connection Response (0x03) ident 38 len 8
-         Destination CID: 64
-         Source CID: 65
-         Result: Connection refused - security block (0x0003)
-         Status: No further information available (0x0000)
+       L2CAP: Connection Response (0x03) ident 38 len 8
+         Destination CID: 64
+         Source CID: 65
+         Result: Connection refused - security block (0x0003)
+         Status: No further information available (0x0000)

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https://bugs.launchpad.net/bugs/1653506

Title:
  Not possible to connect to Ubuntu from remote device

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