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authorJeff Layton <jlayton@redhat.com>2013-05-26 15:00:58 +0400
committerSteve French <smfrench@gmail.com>2013-06-24 10:56:41 +0400
commit9ddec561313b9c73d6f58a1910d37ea9d965d101 (patch)
tree1519e804b17f195e53ee191a8b6496c01c8668bf /fs/cifs/cifssmb.c
parent2190eca1d07956cf81a9ed974ecd98a427e54817 (diff)
downloadlinux-9ddec561313b9c73d6f58a1910d37ea9d965d101.tar.xz
cifs: move handling of signed connections into separate function
Move the sanity checks for signed connections into a separate function. SMB2's was a cut-and-paste job from CIFS code, so we can make them use the same function. Signed-off-by: Jeff Layton <jlayton@redhat.com> Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru> Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c68
1 files changed, 35 insertions, 33 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index 5dd4f8a51e0c..1a3776322c71 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -417,6 +417,38 @@ decode_ext_sec_blob(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
return 0;
}
+int
+cifs_enable_signing(struct TCP_Server_Info *server, unsigned int secFlags)
+{
+ if ((secFlags & CIFSSEC_MAY_SIGN) == 0) {
+ /* MUST_SIGN already includes the MAY_SIGN FLAG
+ so if this is zero it means that signing is disabled */
+ cifs_dbg(FYI, "Signing disabled\n");
+ if (server->sec_mode & SECMODE_SIGN_REQUIRED) {
+ cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
+ return -EOPNOTSUPP;
+ }
+ server->sec_mode &=
+ ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
+ } else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
+ /* signing required */
+ cifs_dbg(FYI, "Must sign - secFlags 0x%x\n", secFlags);
+ if ((server->sec_mode &
+ (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
+ cifs_dbg(VFS, "signing required but server lacks support\n");
+ return -EOPNOTSUPP;
+ } else
+ server->sec_mode |= SECMODE_SIGN_REQUIRED;
+ } else {
+ /* signing optional ie CIFSSEC_MAY_SIGN */
+ if ((server->sec_mode & SECMODE_SIGN_REQUIRED) == 0)
+ server->sec_mode &=
+ ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
+ }
+
+ return 0;
+}
+
#ifdef CONFIG_CIFS_WEAK_PW_HASH
static int
decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
@@ -577,10 +609,7 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
goto neg_err_exit;
} else if (pSMBr->hdr.WordCount == 13) {
rc = decode_lanman_negprot_rsp(server, pSMBr, secFlags);
- if (!rc)
- goto signing_check;
- else
- goto neg_err_exit;
+ goto signing_check;
} else if (pSMBr->hdr.WordCount != 17) {
/* unknown wct */
rc = -EOPNOTSUPP;
@@ -642,36 +671,9 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
else
server->capabilities &= ~CAP_EXTENDED_SECURITY;
- if (rc)
- goto neg_err_exit;
-
signing_check:
- if ((secFlags & CIFSSEC_MAY_SIGN) == 0) {
- /* MUST_SIGN already includes the MAY_SIGN FLAG
- so if this is zero it means that signing is disabled */
- cifs_dbg(FYI, "Signing disabled\n");
- if (server->sec_mode & SECMODE_SIGN_REQUIRED) {
- cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
- rc = -EOPNOTSUPP;
- }
- server->sec_mode &=
- ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
- } else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
- /* signing required */
- cifs_dbg(FYI, "Must sign - secFlags 0x%x\n", secFlags);
- if ((server->sec_mode &
- (SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
- cifs_dbg(VFS, "signing required but server lacks support\n");
- rc = -EOPNOTSUPP;
- } else
- server->sec_mode |= SECMODE_SIGN_REQUIRED;
- } else {
- /* signing optional ie CIFSSEC_MAY_SIGN */
- if ((server->sec_mode & SECMODE_SIGN_REQUIRED) == 0)
- server->sec_mode &=
- ~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
- }
-
+ if (!rc)
+ rc = cifs_enable_signing(server, secFlags);
neg_err_exit:
cifs_buf_release(pSMB);