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DLP inspection for content shared with external users in Teams
Is there a way to apply the MS DLP to inspect content shared with external users (not guest). Inspecting content that is shared externally is a be a very common requirement when implementing DLP ...
- Hmmm, afaik it does: see here: https://docs.microsoft.com/en-us/microsoft-365/compliance/data-loss-prevention-policies?view=o365-worldwide and section restrict access to content. AFAIK, the other user it has been shared with cannot access it.
In terms of downloading, well, you would probably look to use app protection policies using Intune in order to block downloads on non managed devices
https://docs.microsoft.com/en-gb/mem/intune/protect/data-leak-prevention
Or you could look to apply sensitivity labels, for example on Teams to require the device to be managed
https://microsoft365pro.co.uk/2019/12/10/teams-real-simple-with-pictures-using-sensitivity-labels-to-regulate-the-privacy-and-guest-access-of-a-team/
If you were taking a zero trust policy no device accessing the corporate access or applications would be non-managed.
Best, Chris
Hi Yoav Crombie,
See here on my blog
https://microsoft365pro.co.uk/2019/09/16/teams-real-simple-with-pictures-applying-data-loss-prevention-dlp-to-chat-channel-messages-and-files/
Note: As outlined here on Petri, Teams communications are internal whilst DLP checking for other workloads focuses on outbound email/document sharing. The DLP policy must therefore cover content shared “only with people in my organization” (many existing policies are likely set to cover content shared “with people outside my organization.” In the context of Teams, this means teams with guest users). It is recommended – if external and guest access is on to set two DLP Policies – one internal and one external.
Hope that answers your question!
Best, Chris
See here on my blog
https://microsoft365pro.co.uk/2019/09/16/teams-real-simple-with-pictures-applying-data-loss-prevention-dlp-to-chat-channel-messages-and-files/
Note: As outlined here on Petri, Teams communications are internal whilst DLP checking for other workloads focuses on outbound email/document sharing. The DLP policy must therefore cover content shared “only with people in my organization” (many existing policies are likely set to cover content shared “with people outside my organization.” In the context of Teams, this means teams with guest users). It is recommended – if external and guest access is on to set two DLP Policies – one internal and one external.
Hope that answers your question!
Best, Chris
Nice post ChrisHoardMVP 👍🏼
Does this also work only on non-managed devices? This to prevent any file downloading on non-managed devices. Tried to set it up, and disabling the "Files" section is working, but for files still in the chat it doesn't apply. You can still open/download these. Any idea?
- Hmmm, afaik it does: see here: https://docs.microsoft.com/en-us/microsoft-365/compliance/data-loss-prevention-policies?view=o365-worldwide and section restrict access to content. AFAIK, the other user it has been shared with cannot access it.
In terms of downloading, well, you would probably look to use app protection policies using Intune in order to block downloads on non managed devices
https://docs.microsoft.com/en-gb/mem/intune/protect/data-leak-prevention
Or you could look to apply sensitivity labels, for example on Teams to require the device to be managed
https://microsoft365pro.co.uk/2019/12/10/teams-real-simple-with-pictures-using-sensitivity-labels-to-regulate-the-privacy-and-guest-access-of-a-team/
If you were taking a zero trust policy no device accessing the corporate access or applications would be non-managed.
Best, ChrisChrisHoardMVP thanks for your article.
Do you know if the MS DLP cover messages/files sent in a meeting that is hosted by the external?
