odoo/addons/im/security/ir.model.access.csv

1	id	name	model_id:id	group_id:id	perm_read	perm_write	perm_create	perm_unlink
2	access_im_message	im.message	model_im_message		1	0	1	0
3	access_im_user	im.user	model_im_user		1	1	1	0
4	access_im_session	im.session	model_im_session		1	0	0	0