Signed-off-by: Sachin Prabhu <sprabhu@xxxxxxxxxx>
---
fs/cifs/sess.c | 215 ++++++++++++++++++++++++++++++++++++++++-----------------
1 file changed, 153 insertions(+), 62 deletions(-)
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c
index 4f481c1..b413fae 100644
--- a/fs/cifs/sess.c
+++ b/fs/cifs/sess.c
@@ -963,6 +963,155 @@ out:
ses->auth_key.response = NULL;
}
+#ifdef CONFIG_CIFS_UPCALL
+static void
+sess_auth_kerberos(struct sess_data *sess_data)
+{
+ int rc = 0;
+ struct smb_hdr *smb_buf;
+ SESSION_SETUP_ANDX *pSMB;
+ char *bcc_ptr;
+ struct cifs_ses *ses = sess_data->ses;
+ __u32 capabilities;
+ __u16 bytes_remaining;
+ struct key *spnego_key = NULL;
+ struct cifs_spnego_msg *msg;
+ u16 blob_len;
+
+ /* extended security */
+ /* wct = 12 */
+ rc = sess_alloc_buffer(sess_data, 12);
+ if (rc)
+ goto out;
+
+ pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+ bcc_ptr = sess_data->iov[2].iov_base;
+ capabilities = cifs_ssetup_hdr(ses, pSMB);
+
+ spnego_key = cifs_get_spnego_key(ses);
+ if (IS_ERR(spnego_key)) {
+ rc = PTR_ERR(spnego_key);
+ spnego_key = NULL;
+ goto out;
+ }
+
+ msg = spnego_key->payload.data;
+ /*
+ * check version field to make sure that cifs.upcall is
+ * sending us a response in an expected form
+ */
+ if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
+ cifs_dbg(VFS,
+ "incorrect version of cifs.upcall (expected %d but got %d)",
+ CIFS_SPNEGO_UPCALL_VERSION, msg->version);
+ rc = -EKEYREJECTED;
+ goto out_put_spnego_key;
+ }
+
+ ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
+ GFP_KERNEL);
+ if (!ses->auth_key.response) {
+ cifs_dbg(VFS, "Kerberos can't allocate (%u bytes) memory",
+ msg->sesskey_len);
+ rc = -ENOMEM;
+ goto out_put_spnego_key;
+ }
+ ses->auth_key.len = msg->sesskey_len;
+
+ pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
+ capabilities |= CAP_EXTENDED_SECURITY;
+ pSMB->req.Capabilities = cpu_to_le32(capabilities);
+ sess_data->iov[1].iov_base = msg->data + msg->sesskey_len;
+ sess_data->iov[1].iov_len = msg->secblob_len;
+ pSMB->req.SecurityBlobLength = cpu_to_le16(sess_data->iov[1].iov_len);
+
+ if (ses->capabilities & CAP_UNICODE) {
+ /* unicode strings must be word aligned */
+ if ((sess_data->iov[0].iov_len
+ + sess_data->iov[1].iov_len) % 2) {
+ *bcc_ptr = 0;
+ bcc_ptr++;
+ }
+ unicode_oslm_strings(&bcc_ptr, sess_data->nls_cp);
+ unicode_domain_string(&bcc_ptr, ses, sess_data->nls_cp);
+ } else {
+ /* BB: is this right? */
+ ascii_ssetup_strings(&bcc_ptr, ses, sess_data->nls_cp);
+ }
+
+ sess_data->iov[2].iov_len = (long) bcc_ptr -
+ (long) sess_data->iov[2].iov_base;
+
+ rc = sess_sendreceive(sess_data);
+ if (rc)
+ goto out_put_spnego_key;
+
+ pSMB = (SESSION_SETUP_ANDX *)sess_data->iov[0].iov_base;
+ smb_buf = (struct smb_hdr *)sess_data->iov[0].iov_base;
+
+ if (smb_buf->WordCount != 4) {
+ rc = -EIO;
+ cifs_dbg(VFS, "bad word count %d\n", smb_buf->WordCount);
+ goto out_put_spnego_key;
+ }
+
+ if (le16_to_cpu(pSMB->resp.Action) & GUEST_LOGIN)
+ cifs_dbg(FYI, "Guest login\n"); /* BB mark SesInfo struct? */
+
+ ses->Suid = smb_buf->Uid; /* UID left in wire format (le) */
+ cifs_dbg(FYI, "UID = %llu\n", ses->Suid);
+
+ bytes_remaining = get_bcc(smb_buf);
+ bcc_ptr = pByteArea(smb_buf);
+
+ blob_len = le16_to_cpu(pSMB->resp.SecurityBlobLength);
+ if (blob_len > bytes_remaining) {
+ cifs_dbg(VFS, "bad security blob length %d\n",
+ blob_len);
+ rc = -EINVAL;
+ goto out_put_spnego_key;
+ }
+ bcc_ptr += blob_len;
+ bytes_remaining -= blob_len;
+
+ /* BB check if Unicode and decode strings */
+ if (bytes_remaining == 0) {
+ /* no string area to decode, do nothing */
+ } else if (smb_buf->Flags2 & SMBFLG2_UNICODE) {
+ /* unicode string area must be word-aligned */
+ if (((unsigned long) bcc_ptr - (unsigned long) smb_buf) % 2) {
+ ++bcc_ptr;
+ --bytes_remaining;
+ }
+ decode_unicode_ssetup(&bcc_ptr, bytes_remaining, ses,
+ sess_data->nls_cp);
+ } else {
+ decode_ascii_ssetup(&bcc_ptr, bytes_remaining, ses,
+ sess_data->nls_cp);
+ }
+
+ rc = sess_establish_session(sess_data);
+out_put_spnego_key:
+ key_invalidate(spnego_key);
+ key_put(spnego_key);
+out:
+ sess_data->result = rc;
+ sess_data->func = NULL;
+ sess_free_buffer(sess_data);
+ kfree(ses->auth_key.response);
+ ses->auth_key.response = NULL;
+}
+
+#else
+
+static void
+sess_auth_kerberos(struct sess_data *sess_data)
+{
+ cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
+ sess_data->result = -ENOSYS;
+ sess_data->func = NULL;
+}
+#endif /* ! CONFIG_CIFS_UPCALL */
int
CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
@@ -980,7 +1129,6 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
struct kvec iov[3];
enum securityEnum type;
__u16 action, bytes_remaining;
- struct key *spnego_key = NULL;
__le32 phase = NtLmNegotiate; /* NTLMSSP, if needed, is multistage */
u16 blob_len;
char *ntlmsspblob = NULL;
@@ -1017,6 +1165,9 @@ CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses,
case NTLMv2:
sess_auth_ntlmv2(sess_data);
goto out;
+ case Kerberos:
+ sess_auth_kerberos(sess_data);
+ goto out;
default:
cifs_dbg(FYI, "Continuing with CIFS_SessSetup\n");
}
@@ -1072,63 +1223,7 @@ ssetup_ntlmssp_authenticate:
iov[1].iov_base = NULL;
iov[1].iov_len = 0;
- if (type == Kerberos) {
-#ifdef CONFIG_CIFS_UPCALL
- struct cifs_spnego_msg *msg;
-
- spnego_key = cifs_get_spnego_key(ses);
- if (IS_ERR(spnego_key)) {
- rc = PTR_ERR(spnego_key);
- spnego_key = NULL;
- goto ssetup_exit;
- }
-
- msg = spnego_key->payload.data;
- /* check version field to make sure that cifs.upcall is
- sending us a response in an expected form */
- if (msg->version != CIFS_SPNEGO_UPCALL_VERSION) {
- cifs_dbg(VFS, "incorrect version of cifs.upcall "
- "expected %d but got %d)",
- CIFS_SPNEGO_UPCALL_VERSION, msg->version);
- rc = -EKEYREJECTED;
- goto ssetup_exit;
- }
-
- ses->auth_key.response = kmemdup(msg->data, msg->sesskey_len,
- GFP_KERNEL);
- if (!ses->auth_key.response) {
- cifs_dbg(VFS,
- "Kerberos can't allocate (%u bytes) memory",
- msg->sesskey_len);
- rc = -ENOMEM;
- goto ssetup_exit;
- }
- ses->auth_key.len = msg->sesskey_len;
-
- pSMB->req.hdr.Flags2 |= SMBFLG2_EXT_SEC;
- capabilities |= CAP_EXTENDED_SECURITY;
- pSMB->req.Capabilities = cpu_to_le32(capabilities);
- iov[1].iov_base = msg->data + msg->sesskey_len;
- iov[1].iov_len = msg->secblob_len;
- pSMB->req.SecurityBlobLength = cpu_to_le16(iov[1].iov_len);
-
- if (ses->capabilities & CAP_UNICODE) {
- /* unicode strings must be word aligned */
- if ((iov[0].iov_len + iov[1].iov_len) % 2) {
- *bcc_ptr = 0;
- bcc_ptr++;
- }
- unicode_oslm_strings(&bcc_ptr, nls_cp);
- unicode_domain_string(&bcc_ptr, ses, nls_cp);
- } else
- /* BB: is this right? */
- ascii_ssetup_strings(&bcc_ptr, ses, nls_cp);
-#else /* ! CONFIG_CIFS_UPCALL */
- cifs_dbg(VFS, "Kerberos negotiated but upcall support disabled!\n");
- rc = -ENOSYS;
- goto ssetup_exit;
-#endif /* CONFIG_CIFS_UPCALL */
- } else if (type == RawNTLMSSP) {
+ if (type == RawNTLMSSP) {
if ((pSMB->req.hdr.Flags2 & SMBFLG2_UNICODE) == 0) {
cifs_dbg(VFS, "NTLMSSP requires Unicode support\n");
rc = -ENOSYS;
@@ -1268,10 +1363,6 @@ ssetup_ntlmssp_authenticate:
}
ssetup_exit:
- if (spnego_key) {
- key_invalidate(spnego_key);
- key_put(spnego_key);
- }
kfree(str_area);
kfree(ntlmsspblob);
ntlmsspblob = NULL;
--
1.9.3
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