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[CIFS] Have CIFS_SessSetup build correct SPNEGO SessionSetup request
Have CIFS_SessSetup call cifs_get_spnego_key when Kerberos is negotiated. Use the info in the key payload to build a session setup request packet. Also clean up how the request buffer in the function is freed on error. With appropriate user space helper (in samba/source/client). Kerberos support (secure session establishment can be done now via Kerberos, previously users would have to use NTLMv2 instead for more secure session setup). Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Steve French
parent
8840dee9dc
commit
2442421b17
4 changed files with 77 additions and 18 deletions
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@ -1,6 +1,7 @@
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Version 1.52
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------------
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Fix oops on second mount to server when null auth is used.
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Enable experimental Kerberos support
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Version 1.51
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------------
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@ -16,7 +16,7 @@ SecurityDescriptors
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c) Better pam/winbind integration (e.g. to handle uid mapping
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better)
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d) Kerberos/SPNEGO session setup support - (started)
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d) Verify that Kerberos signing works
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e) Cleanup now unneeded SessSetup code in
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fs/cifs/connect.c and add back in NTLMSSP code if any servers
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@ -110,6 +110,7 @@ struct mac_key {
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unsigned int len;
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union {
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char ntlm[CIFS_SESS_KEY_SIZE + 16];
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char krb5[CIFS_SESS_KEY_SIZE + 16]; /* BB: length correct? */
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struct {
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char key[16];
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struct ntlmv2_resp resp;
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@ -29,6 +29,7 @@
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#include "ntlmssp.h"
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#include "nterr.h"
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#include <linux/utsname.h>
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#include "cifs_spnego.h"
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extern void SMBNTencrypt(unsigned char *passwd, unsigned char *c8,
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unsigned char *p24);
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@ -340,11 +341,12 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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SESSION_SETUP_ANDX *pSMB;
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__u32 capabilities;
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int count;
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int resp_buf_type = 0;
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struct kvec iov[2];
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int resp_buf_type;
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struct kvec iov[3];
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enum securityEnum type;
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__u16 action;
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int bytes_remaining;
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struct key *spnego_key = NULL;
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if (ses == NULL)
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return -EINVAL;
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@ -377,24 +379,32 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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capabilities = cifs_ssetup_hdr(ses, pSMB);
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/* we will send the SMB in two pieces,
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a fixed length beginning part, and a
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second part which will include the strings
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and rest of bcc area, in order to avoid having
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to do a large buffer 17K allocation */
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/* we will send the SMB in three pieces:
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a fixed length beginning part, an optional
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SPNEGO blob (which can be zero length), and a
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last part which will include the strings
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and rest of bcc area. This allows us to avoid
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a large buffer 17K allocation */
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iov[0].iov_base = (char *)pSMB;
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iov[0].iov_len = smb_buf->smb_buf_length + 4;
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/* setting this here allows the code at the end of the function
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to free the request buffer if there's an error */
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resp_buf_type = CIFS_SMALL_BUFFER;
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/* 2000 big enough to fit max user, domain, NOS name etc. */
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str_area = kmalloc(2000, GFP_KERNEL);
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if (str_area == NULL) {
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cifs_small_buf_release(smb_buf);
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return -ENOMEM;
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rc = -ENOMEM;
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goto ssetup_exit;
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}
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bcc_ptr = str_area;
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ses->flags &= ~CIFS_SES_LANMAN;
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iov[1].iov_base = NULL;
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iov[1].iov_len = 0;
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if (type == LANMAN) {
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#ifdef CONFIG_CIFS_WEAK_PW_HASH
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char lnm_session_key[CIFS_SESS_KEY_SIZE];
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@ -463,8 +473,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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struct ntlmv2_resp */
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if (v2_sess_key == NULL) {
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cifs_small_buf_release(smb_buf);
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return -ENOMEM;
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rc = -ENOMEM;
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goto ssetup_exit;
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}
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pSMB->req_no_secext.Capabilities = cpu_to_le32(capabilities);
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@ -499,21 +509,66 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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unicode_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else
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ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
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} else /* NTLMSSP or SPNEGO */ {
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} else if (type == Kerberos) {
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#ifdef CONFIG_CIFS_UPCALL
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struct cifs_spnego_msg *msg;
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spnego_key = cifs_get_spnego_key(ses);
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if (IS_ERR(spnego_key)) {
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rc = PTR_ERR(spnego_key);
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spnego_key = NULL;
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goto ssetup_exit;
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}
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msg = spnego_key->payload.data;
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/* bail out if key is too long */
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if (msg->sesskey_len >
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sizeof(ses->server->mac_signing_key.data.krb5)) {
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cERROR(1, ("Kerberos signing key too long (%u bytes)",
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msg->sesskey_len));
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rc = -EOVERFLOW;
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goto ssetup_exit;
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}
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ses->server->mac_signing_key.len = msg->sesskey_len;
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memcpy(ses->server->mac_signing_key.data.krb5, msg->data,
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msg->sesskey_len);
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pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
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capabilities |= CAP_EXTENDED_SECURITY;
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pSMB->req.Capabilities = cpu_to_le32(capabilities);
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/* BB set password lengths */
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iov[1].iov_base = msg->data + msg->sesskey_len;
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iov[1].iov_len = msg->secblob_len;
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pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
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if (ses->capabilities & CAP_UNICODE) {
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/* unicode strings must be word aligned */
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if (iov[0].iov_len % 2) {
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*bcc_ptr = 0;
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bcc_ptr++;
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}
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unicode_oslm_strings(&bcc_ptr, nls_cp);
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unicode_domain_string(&bcc_ptr, ses, nls_cp);
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} else
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/* BB: is this right? */
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ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
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#else /* ! CONFIG_CIFS_UPCALL */
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cERROR(1, ("Kerberos negotiated but upcall support disabled!"));
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rc = -ENOSYS;
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goto ssetup_exit;
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#endif /* CONFIG_CIFS_UPCALL */
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} else {
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cERROR(1, ("secType %d not supported!", type));
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rc = -ENOSYS;
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goto ssetup_exit;
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}
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count = (long) bcc_ptr - (long) str_area;
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iov[2].iov_base = str_area;
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iov[2].iov_len = (long) bcc_ptr - (long) str_area;
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count = iov[1].iov_len + iov[2].iov_len;
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smb_buf->smb_buf_length += count;
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BCC_LE(smb_buf) = cpu_to_le16(count);
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iov[1].iov_base = str_area;
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iov[1].iov_len = count;
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rc = SendReceive2(xid, ses, iov, 2 /* num_iovecs */, &resp_buf_type,
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rc = SendReceive2(xid, ses, iov, 3 /* num_iovecs */, &resp_buf_type,
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CIFS_STD_OP /* not long */ | CIFS_LOG_ERROR);
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/* SMB request buf freed in SendReceive2 */
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@ -560,6 +615,8 @@ CIFS_SessSetup(unsigned int xid, struct cifsSesInfo *ses, int first_time,
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ses, nls_cp);
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ssetup_exit:
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if (spnego_key)
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key_put(spnego_key);
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kfree(str_area);
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if (resp_buf_type == CIFS_SMALL_BUFFER) {
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cFYI(1, ("ssetup freeing small buf %p", iov[0].iov_base));
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