diff options
| author |   Aurelien Aptel <aaptel@suse.com> | 2021-05-21 17:19:27 +0200 |
|---|---|---|
| committer |   Steve French <stfrench@microsoft.com> | 2021-05-27 14:03:47 -0500 |
| commit | 6d2fcfe6b517fe7cbf2687adfb0a16cdcd5d9243 (patch) | |
| tree | cc81121f4c47a3dcab10cf0664c24353390bdc9c /fs/cifs/smb2pdu.c | |
| parent | Linux 5.13-rc3 (diff) | |
| download | linux-dev-6d2fcfe6b517fe7cbf2687adfb0a16cdcd5d9243.tar.xz linux-dev-6d2fcfe6b517fe7cbf2687adfb0a16cdcd5d9243.zip | |
cifs: set server->cipher_type to AES-128-CCM for SMB3.0
SMB3.0 doesn't have encryption negotiate context but simply uses
the SMB2_GLOBAL_CAP_ENCRYPTION flag.
When that flag is present in the neg response cifs.ko uses AES-128-CCM
which is the only cipher available in this context.
cipher_type was set to the server cipher only when parsing encryption
negotiate context (SMB3.1.1).
For SMB3.0 it was set to 0. This means cipher_type value can be 0 or 1
for AES-128-CCM.
Fix this by checking for SMB3.0 and encryption capability and setting
cipher_type appropriately.
Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/smb2pdu.c')
| -rw-r--r-- | fs/cifs/smb2pdu.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 9f24eb88297a..c205f93e0a10 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -958,6 +958,13 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses) /* Internal types */ server->capabilities |= SMB2_NT_FIND | SMB2_LARGE_FILES; + /* + * SMB3.0 supports only 1 cipher and doesn't have a encryption neg context + * Set the cipher type manually. + */ + if (server->dialect == SMB30_PROT_ID && (server->capabilities & SMB2_GLOBAL_CAP_ENCRYPTION)) + server->cipher_type = SMB2_ENCRYPTION_AES128_CCM; + security_blob = smb2_get_data_area_len(&blob_offset, &blob_length, (struct smb2_sync_hdr *)rsp); /* |