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cifs: move handling of signed connections into separate function

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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>
This commit is contained in:
Jeff Layton 2013-05-26 07:00:58 -04:00 • committed by Steve French
commit 9ddec56131
3 changed files with 40 additions and 62 deletions
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1
fs/cifs/cifsproto.h
View file

@ -212,6 +212,7 @@ extern int cifs_negotiate_protocol(const unsigned int xid,
struct cifs_ses *ses);
extern int cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
struct nls_table *nls_info);
extern int cifs_enable_signing(struct TCP_Server_Info *server, unsigned int secFlags);
extern int CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses);
extern int CIFSTCon(const unsigned int xid, struct cifs_ses *ses,

68
fs/cifs/cifssmb.c
View file

@ -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);

33
fs/cifs/smb2pdu.c
View file

@ -423,36 +423,11 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
}
cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
cifs_dbg(FYI, "Signing required\n");
if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
SMB2_NEGOTIATE_SIGNING_ENABLED))) {
cifs_dbg(VFS, "signing required but server lacks support\n");
rc = -EOPNOTSUPP;
goto neg_exit;
}
server->sec_mode |= SECMODE_SIGN_REQUIRED;
} else if (sec_flags & CIFSSEC_MAY_SIGN) {
cifs_dbg(FYI, "Signing optional\n");
if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
cifs_dbg(FYI, "Server requires signing\n");
server->sec_mode |= SECMODE_SIGN_REQUIRED;
} else {
server->sec_mode &=
~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
}
} else {
cifs_dbg(FYI, "Signing disabled\n");
if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
rc = -EOPNOTSUPP;
goto neg_exit;
}
server->sec_mode &=
~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
}
rc = cifs_enable_signing(server, sec_flags);
#ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
if (rc)
goto neg_exit;
rc = decode_neg_token_init(security_blob, blob_length,
&server->sec_type);
if (rc == 1)