[strongSwan-dev] Memwipe of loaded secrets through VICI

Tobias Brunner tobias at strongswan.org
Fri Oct 1 13:55:46 CEST 2021

Hi Jean-Francois,

> For the mmap, I'm not expert and I use Strongswan under FreeBSD so I'm 
> not sure the behavior is the same.

Yeah, don't know either.

> However since decrypted private key blobs are written in the mmap chunk, 

As far as I can tell, that's not the case.  The first thing the pem 
plugin does is cloning the chunk (pem_builder_t:load_from_blob()).  But 
if the key is not encrypted and mmap() is not available, there will 
definitely be another copy of the key in memory that we have to clean.

> In src/swanctl/commands/load_creds.c:load_containers(), a call to 
> chunk_unmap_clear() should be done too maybe ?

While it's possible to create PKCS#12 containers without encryption, I 
don't think that's very common in practice.  But sure, we can add it 
just to be safe.

> The static buffer returned by getpass() calls in swanctl should be wiped 
> too after use.

Thanks, I've pushed another commit that changes that for all getpass() 


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