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>
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@ -212,6 +212,7 @@ extern int cifs_negotiate_protocol(const unsigned int xid,
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struct cifs_ses *ses);
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extern int cifs_setup_session(const unsigned int xid, struct cifs_ses *ses,
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struct nls_table *nls_info);
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extern int cifs_enable_signing(struct TCP_Server_Info *server, unsigned int secFlags);
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extern int CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses);
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extern int CIFSTCon(const unsigned int xid, struct cifs_ses *ses,
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@ -417,6 +417,38 @@ decode_ext_sec_blob(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
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return 0;
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}
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int
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cifs_enable_signing(struct TCP_Server_Info *server, unsigned int secFlags)
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{
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if ((secFlags & CIFSSEC_MAY_SIGN) == 0) {
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/* MUST_SIGN already includes the MAY_SIGN FLAG
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so if this is zero it means that signing is disabled */
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cifs_dbg(FYI, "Signing disabled\n");
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if (server->sec_mode & SECMODE_SIGN_REQUIRED) {
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cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
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return -EOPNOTSUPP;
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}
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server->sec_mode &=
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~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
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} else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
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/* signing required */
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cifs_dbg(FYI, "Must sign - secFlags 0x%x\n", secFlags);
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if ((server->sec_mode &
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(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
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cifs_dbg(VFS, "signing required but server lacks support\n");
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return -EOPNOTSUPP;
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} else
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server->sec_mode |= SECMODE_SIGN_REQUIRED;
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} else {
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/* signing optional ie CIFSSEC_MAY_SIGN */
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if ((server->sec_mode & SECMODE_SIGN_REQUIRED) == 0)
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server->sec_mode &=
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~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
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}
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return 0;
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}
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#ifdef CONFIG_CIFS_WEAK_PW_HASH
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static int
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decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
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@ -577,10 +609,7 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
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goto neg_err_exit;
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} else if (pSMBr->hdr.WordCount == 13) {
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rc = decode_lanman_negprot_rsp(server, pSMBr, secFlags);
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if (!rc)
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goto signing_check;
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else
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goto neg_err_exit;
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} else if (pSMBr->hdr.WordCount != 17) {
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/* unknown wct */
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rc = -EOPNOTSUPP;
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@ -642,36 +671,9 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
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else
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server->capabilities &= ~CAP_EXTENDED_SECURITY;
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if (rc)
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goto neg_err_exit;
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signing_check:
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if ((secFlags & CIFSSEC_MAY_SIGN) == 0) {
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/* MUST_SIGN already includes the MAY_SIGN FLAG
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so if this is zero it means that signing is disabled */
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cifs_dbg(FYI, "Signing disabled\n");
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if (server->sec_mode & SECMODE_SIGN_REQUIRED) {
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cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
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rc = -EOPNOTSUPP;
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}
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server->sec_mode &=
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~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
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} else if ((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
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/* signing required */
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cifs_dbg(FYI, "Must sign - secFlags 0x%x\n", secFlags);
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if ((server->sec_mode &
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(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED)) == 0) {
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cifs_dbg(VFS, "signing required but server lacks support\n");
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rc = -EOPNOTSUPP;
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} else
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server->sec_mode |= SECMODE_SIGN_REQUIRED;
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} else {
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/* signing optional ie CIFSSEC_MAY_SIGN */
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if ((server->sec_mode & SECMODE_SIGN_REQUIRED) == 0)
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server->sec_mode &=
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~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
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}
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if (!rc)
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rc = cifs_enable_signing(server, secFlags);
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neg_err_exit:
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cifs_buf_release(pSMB);
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@ -423,36 +423,11 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
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}
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cifs_dbg(FYI, "sec_flags 0x%x\n", sec_flags);
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if ((sec_flags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) {
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cifs_dbg(FYI, "Signing required\n");
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if (!(server->sec_mode & (SMB2_NEGOTIATE_SIGNING_REQUIRED |
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SMB2_NEGOTIATE_SIGNING_ENABLED))) {
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cifs_dbg(VFS, "signing required but server lacks support\n");
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rc = -EOPNOTSUPP;
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goto neg_exit;
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}
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server->sec_mode |= SECMODE_SIGN_REQUIRED;
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} else if (sec_flags & CIFSSEC_MAY_SIGN) {
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cifs_dbg(FYI, "Signing optional\n");
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if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
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cifs_dbg(FYI, "Server requires signing\n");
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server->sec_mode |= SECMODE_SIGN_REQUIRED;
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} else {
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server->sec_mode &=
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~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
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}
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} else {
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cifs_dbg(FYI, "Signing disabled\n");
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if (server->sec_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) {
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cifs_dbg(VFS, "Server requires packet signing to be enabled in /proc/fs/cifs/SecurityFlags\n");
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rc = -EOPNOTSUPP;
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goto neg_exit;
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}
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server->sec_mode &=
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~(SECMODE_SIGN_ENABLED | SECMODE_SIGN_REQUIRED);
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}
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rc = cifs_enable_signing(server, sec_flags);
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#ifdef CONFIG_SMB2_ASN1 /* BB REMOVEME when updated asn1.c ready */
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if (rc)
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goto neg_exit;
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rc = decode_neg_token_init(security_blob, blob_length,
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&server->sec_type);
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if (rc == 1)
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