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| author | Steve French <stfrench@microsoft.com> | 2020-10-14 20:24:09 -0500 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2020-10-15 23:58:15 -0500 |
| commit | 29e279230413cdd5e00fb5d269cae1099184ab85 (patch) | |
| tree | 8556337d076697bdbaba24dc949bdf2f33b3d179 /fs/cifs/smb2pdu.c | |
| parent | fbfd0b46afa9a8b50a061b0f28204fc94c7bddcf (diff) | |
| download | lwn-29e279230413cdd5e00fb5d269cae1099184ab85.tar.gz lwn-29e279230413cdd5e00fb5d269cae1099184ab85.zip | |
smb3.1.1: add new module load parm enable_gcm_256
Add new module load parameter enable_gcm_256. If set, then add
AES-256-GCM (strongest encryption type) to the list of encryption
types requested. Put it in the list as the second choice (since
AES-128-GCM is faster and much more broadly supported by
SMB3 servers). To make this stronger encryption type, GCM-256,
required (the first and only choice, you would use module parameter
"require_gcm_256."
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index fcae1e3dfcc5..8cfc3122ae5c 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -453,6 +453,12 @@ build_encrypt_ctxt(struct smb2_encryption_neg_context *pneg_ctxt) pneg_ctxt->DataLength = cpu_to_le16(4); /* Cipher Count + 1 cipher */ pneg_ctxt->CipherCount = cpu_to_le16(1); pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES256_GCM; + } else if (enable_gcm_256) { + pneg_ctxt->DataLength = cpu_to_le16(8); /* Cipher Count + 3 ciphers */ + pneg_ctxt->CipherCount = cpu_to_le16(3); + pneg_ctxt->Ciphers[0] = SMB2_ENCRYPTION_AES128_GCM; + pneg_ctxt->Ciphers[1] = SMB2_ENCRYPTION_AES256_GCM; + pneg_ctxt->Ciphers[2] = SMB2_ENCRYPTION_AES128_CCM; } else { pneg_ctxt->DataLength = cpu_to_le16(6); /* Cipher Count + 2 ciphers */ pneg_ctxt->CipherCount = cpu_to_le16(2); |