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path: root/fs/cifs/cifssmb.c
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Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c92
1 files changed, 20 insertions, 72 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index dd7e2f61f607..a35aad2060c5 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -368,11 +368,12 @@ vt2_err:
}
static int
-decode_ext_sec_blob(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
+decode_ext_sec_blob(struct cifs_ses *ses, NEGOTIATE_RSP *pSMBr)
{
int rc = 0;
u16 count;
char *guid = pSMBr->u.extended_response.GUID;
+ struct TCP_Server_Info *server = ses->server;
count = get_bcc(&pSMBr->hdr);
if (count < SMB1_CLIENT_GUID_SIZE)
@@ -391,27 +392,13 @@ decode_ext_sec_blob(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
}
if (count == SMB1_CLIENT_GUID_SIZE) {
- server->secType = RawNTLMSSP;
+ server->sec_ntlmssp = true;
} else {
count -= SMB1_CLIENT_GUID_SIZE;
rc = decode_negTokenInit(
pSMBr->u.extended_response.SecurityBlob, count, server);
if (rc != 1)
return -EINVAL;
-
- /* Make sure server supports what we want to use */
- switch(server->secType) {
- case Kerberos:
- if (!server->sec_kerberos && !server->sec_mskerberos)
- return -EOPNOTSUPP;
- break;
- case RawNTLMSSP:
- if (!server->sec_ntlmssp)
- return -EOPNOTSUPP;
- break;
- default:
- return -EOPNOTSUPP;
- }
}
return 0;
@@ -462,8 +449,7 @@ cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
#ifdef CONFIG_CIFS_WEAK_PW_HASH
static int
-decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
- unsigned int secFlags)
+decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
{
__s16 tmp;
struct lanman_neg_rsp *rsp = (struct lanman_neg_rsp *)pSMBr;
@@ -471,12 +457,6 @@ decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
if (server->dialect != LANMAN_PROT && server->dialect != LANMAN2_PROT)
return -EOPNOTSUPP;
- if ((secFlags & CIFSSEC_MAY_LANMAN) || (secFlags & CIFSSEC_MAY_PLNTXT))
- server->secType = LANMAN;
- else {
- cifs_dbg(VFS, "mount failed weak security disabled in /proc/fs/cifs/SecurityFlags\n");
- return -EOPNOTSUPP;
- }
server->sec_mode = le16_to_cpu(rsp->SecurityMode);
server->maxReq = min_t(unsigned int,
le16_to_cpu(rsp->MaxMpxCount),
@@ -542,8 +522,7 @@ decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
}
#else
static inline int
-decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
- unsigned int secFlags)
+decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr)
{
cifs_dbg(VFS, "mount failed, cifs module not built with CIFS_WEAK_PW_HASH support\n");
return -EOPNOTSUPP;
@@ -551,17 +530,20 @@ decode_lanman_negprot_rsp(struct TCP_Server_Info *server, NEGOTIATE_RSP *pSMBr,
#endif
static bool
-should_set_ext_sec_flag(unsigned int secFlags)
+should_set_ext_sec_flag(enum securityEnum sectype)
{
- if ((secFlags & CIFSSEC_MUST_KRB5) == CIFSSEC_MUST_KRB5)
- return true;
- else if ((secFlags & CIFSSEC_AUTH_MASK) == CIFSSEC_MAY_KRB5)
- return true;
- else if ((secFlags & CIFSSEC_MUST_NTLMSSP) == CIFSSEC_MUST_NTLMSSP)
- return true;
- else if ((secFlags & CIFSSEC_AUTH_MASK) == CIFSSEC_MAY_NTLMSSP)
+ switch (sectype) {
+ case RawNTLMSSP:
+ case Kerberos:
return true;
- return false;
+ case Unspecified:
+ if (global_secflags &
+ (CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP))
+ return true;
+ /* Fallthrough */
+ default:
+ return false;
+ }
}
int
@@ -574,7 +556,6 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
int i;
struct TCP_Server_Info *server = ses->server;
u16 count;
- unsigned int secFlags;
if (!server) {
WARN(1, "%s: server is NULL!\n", __func__);
@@ -586,18 +567,10 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
if (rc)
return rc;
- /* if any of auth flags (ie not sign or seal) are overriden use them */
- if (ses->overrideSecFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL)))
- secFlags = ses->overrideSecFlg; /* BB FIXME fix sign flags? */
- else /* if override flags set only sign/seal OR them with global auth */
- secFlags = global_secflags | ses->overrideSecFlg;
-
- cifs_dbg(FYI, "secFlags 0x%x\n", secFlags);
-
pSMB->hdr.Mid = get_next_mid(server);
pSMB->hdr.Flags2 |= (SMBFLG2_UNICODE | SMBFLG2_ERR_STATUS);
- if (should_set_ext_sec_flag(secFlags)) {
+ if (should_set_ext_sec_flag(ses->sectype)) {
cifs_dbg(FYI, "Requesting extended security.");
pSMB->hdr.Flags2 |= SMBFLG2_EXT_SEC;
}
@@ -627,7 +600,7 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
goto neg_err_exit;
} else if (pSMBr->hdr.WordCount == 13) {
server->negflavor = CIFS_NEGFLAVOR_LANMAN;
- rc = decode_lanman_negprot_rsp(server, pSMBr, secFlags);
+ rc = decode_lanman_negprot_rsp(server, pSMBr);
goto signing_check;
} else if (pSMBr->hdr.WordCount != 17) {
/* unknown wct */
@@ -640,31 +613,6 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
if ((server->sec_mode & SECMODE_USER) == 0)
cifs_dbg(FYI, "share mode security\n");
- if ((server->sec_mode & SECMODE_PW_ENCRYPT) == 0)
-#ifdef CONFIG_CIFS_WEAK_PW_HASH
- if ((secFlags & CIFSSEC_MAY_PLNTXT) == 0)
-#endif /* CIFS_WEAK_PW_HASH */
- cifs_dbg(VFS, "Server requests plain text password but client support disabled\n");
-
- if ((secFlags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
- server->secType = NTLMv2;
- else if (secFlags & CIFSSEC_MAY_NTLM)
- server->secType = NTLM;
- else if (secFlags & CIFSSEC_MAY_NTLMV2)
- server->secType = NTLMv2;
- else if (secFlags & CIFSSEC_MAY_KRB5)
- server->secType = Kerberos;
- else if (secFlags & CIFSSEC_MAY_NTLMSSP)
- server->secType = RawNTLMSSP;
- else if (secFlags & CIFSSEC_MAY_LANMAN)
- server->secType = LANMAN;
- else {
- rc = -EOPNOTSUPP;
- cifs_dbg(VFS, "Invalid security type\n");
- goto neg_err_exit;
- }
- /* else ... any others ...? */
-
/* one byte, so no need to convert this or EncryptionKeyLen from
little endian */
server->maxReq = min_t(unsigned int, le16_to_cpu(pSMBr->MaxMpxCount),
@@ -686,7 +634,7 @@ CIFSSMBNegotiate(const unsigned int xid, struct cifs_ses *ses)
server->capabilities & CAP_EXTENDED_SECURITY) &&
(pSMBr->EncryptionKeyLength == 0)) {
server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
- rc = decode_ext_sec_blob(server, pSMBr);
+ rc = decode_ext_sec_blob(ses, pSMBr);
} else if (server->sec_mode & SECMODE_PW_ENCRYPT) {
rc = -EIO; /* no crypt key only if plain text pwd */
} else {
generated by cgit v1.2.3 (git 2.39.0) at 2024-12-27 23:13:42 +0300