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| author | Steve French <stfrench@microsoft.com> | 2018-05-24 11:11:07 +0200 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2018-05-30 23:06:18 +0200 |
| commit | f92a720ee9d5d4e76a9621ce0812aef133c7b981 (patch) | |
| tree | 26f6387be83eba35333481337bcbe43491277053 /fs/cifs/cifsfs.c | |
| parent | cifs: make minor clarifications to module params for cifs.ko (diff) | |
| download | linux-f92a720ee9d5d4e76a9621ce0812aef133c7b981.tar.xz linux-f92a720ee9d5d4e76a9621ce0812aef133c7b981.zip | |
cifs: allow disabling less secure legacy dialects
To improve security it may be helpful to have additional ways to restrict the
ability to override the default dialects (SMB2.1, SMB3 and SMB3.02) on mount
with old dialects (CIFS/SMB1 and SMB2) since vers=1.0 (CIFS/SMB1) and vers=2.0
are weaker and less secure.
Add a module parameter "disable_legacy_dialects"
(/sys/module/cifs/parameters/disable_legacy_dialects) which can be set to
1 (or equivalently Y) to forbid use of vers=1.0 or vers=2.0 on mount.
Also cleans up a few build warnings about globals for various module parms.
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/cifsfs.c')
| -rw-r--r-- | fs/cifs/cifsfs.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c index fe30aabe00d7..c608ea62f536 100644 --- a/fs/cifs/cifsfs.c +++ b/fs/cifs/cifsfs.c @@ -58,6 +58,7 @@ bool traceSMB; bool enable_oplocks = true; bool linuxExtEnabled = true; bool lookupCacheEnabled = true; +bool disable_legacy_dialects; /* false by default */ unsigned int global_secflags = CIFSSEC_DEF; /* unsigned int ntlmv2_support = 0; */ unsigned int sign_CIFS_PDUs = 1; @@ -83,6 +84,15 @@ MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for " module_param(enable_oplocks, bool, 0644); MODULE_PARM_DESC(enable_oplocks, "Enable or disable oplocks. Default: y/Y/1"); +module_param(disable_legacy_dialects, bool, 0644); +MODULE_PARM_DESC(disable_legacy_dialects, "To improve security it may be " + "helpful to restrict the ability to " + "override the default dialects (SMB2.1, " + "SMB3 and SMB3.02) on mount with old " + "dialects (CIFS/SMB1 and SMB2) since " + "vers=1.0 (CIFS/SMB1) and vers=2.0 are weaker" + " and less secure. Default: n/N/0"); + extern mempool_t *cifs_sm_req_poolp; extern mempool_t *cifs_req_poolp; extern mempool_t *cifs_mid_poolp; |