Merge tag '5.15-rc-smb3-fixes-part1' of git://git.samba.org/sfrench/cifs-2.6

Pull cifs client updates from Steve French:
 "Eleven cifs/smb3 client fixes:

   - mostly restructuring to allow disabling less secure algorithms
     (this will allow eventual removing rc4 and md4 from general use in
     the kernel)

   - four fixes, including two for stable

   - enable r/w support with fscache and cifs.ko

  I am working on a larger set of changes (the usual ... multichannel,
  auth and signing improvements), but wanted to get these in earlier to
  reduce chance of merge conflicts later in the merge window"

* tag '5.15-rc-smb3-fixes-part1' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: Do not leak EDEADLK to dgetents64 for STATUS_USER_SESSION_DELETED
  cifs: add cifs_common directory to MAINTAINERS file
  cifs: cifs_md4 convert to SPDX identifier
  cifs: create a MD4 module and switch cifs.ko to use it
  cifs: fork arc4 and create a separate module for it for cifs and other users
  cifs: remove support for NTLM and weaker authentication algorithms
  cifs: enable fscache usage even for files opened as rw
  oid_registry: Add OIDs for missing Spnego auth mechanisms to Macs
  smb3: fix posix extensions mount option
  cifs: fix wrong release in sess_alloc_buffer() failed path
  CIFS: Fix a potencially linear read overflow

Author: torvalds

MAINTAINERS

@@ -4629,6 +4629,7 @@ W:	http://linux-cifs.samba.org/
 T:	git git://git.samba.org/sfrench/cifs-2.6.git
 F:	Documentation/admin-guide/cifs/
 F:	fs/cifs/
+F:	fs/cifs_common/
 
 COMPACTPCI HOTPLUG CORE
 M:	Scott Murray <scott@spiteful.org>

fs/Kconfig

@@ -348,8 +348,15 @@ config NFS_V4_2_SSC_HELPER
 
 source "net/sunrpc/Kconfig"
 source "fs/ceph/Kconfig"
+
 source "fs/cifs/Kconfig"
 source "fs/ksmbd/Kconfig"
+
+config CIFS_COMMON
+	tristate
+	default y if CIFS=y
+	default m if CIFS=m
+
 source "fs/coda/Kconfig"
 source "fs/afs/Kconfig"
 source "fs/9p/Kconfig"

fs/Makefile

@@ -96,6 +96,7 @@ obj-$(CONFIG_LOCKD)		+= lockd/
 obj-$(CONFIG_NLS)		+= nls/
 obj-$(CONFIG_UNICODE)		+= unicode/
 obj-$(CONFIG_SYSV_FS)		+= sysv/
+obj-$(CONFIG_CIFS_COMMON)	+= cifs_common/
 obj-$(CONFIG_CIFS)		+= cifs/
 obj-$(CONFIG_SMB_SERVER)	+= ksmbd/
 obj-$(CONFIG_HPFS_FS)		+= hpfs/

fs/cifs/Kconfig

@@ -4,19 +4,16 @@ config CIFS
 	depends on INET
 	select NLS
 	select CRYPTO
-	select CRYPTO_MD4
 	select CRYPTO_MD5
 	select CRYPTO_SHA256
 	select CRYPTO_SHA512
 	select CRYPTO_CMAC
 	select CRYPTO_HMAC
-	select CRYPTO_LIB_ARC4
 	select CRYPTO_AEAD2
 	select CRYPTO_CCM
 	select CRYPTO_GCM
 	select CRYPTO_ECB
 	select CRYPTO_AES
-	select CRYPTO_LIB_DES
 	select KEYS
 	select DNS_RESOLVER
 	select ASN1
@@ -85,33 +82,6 @@ config CIFS_ALLOW_INSECURE_LEGACY
 
 	  If unsure, say Y.
 
-config CIFS_WEAK_PW_HASH
-	bool "Support legacy servers which use weaker LANMAN security"
-	depends on CIFS && CIFS_ALLOW_INSECURE_LEGACY
-	help
-	  Modern CIFS servers including Samba and most Windows versions
-	  (since 1997) support stronger NTLM (and even NTLMv2 and Kerberos)
-	  security mechanisms. These hash the password more securely
-	  than the mechanisms used in the older LANMAN version of the
-	  SMB protocol but LANMAN based authentication is needed to
-	  establish sessions with some old SMB servers.
-
-	  Enabling this option allows the cifs module to mount to older
-	  LANMAN based servers such as OS/2 and Windows 95, but such
-	  mounts may be less secure than mounts using NTLM or more recent
-	  security mechanisms if you are on a public network.  Unless you
-	  have a need to access old SMB servers (and are on a private
-	  network) you probably want to say N.  Even if this support
-	  is enabled in the kernel build, LANMAN authentication will not be
-	  used automatically. At runtime LANMAN mounts are disabled but
-	  can be set to required (or optional) either in
-	  /proc/fs/cifs (see Documentation/admin-guide/cifs/usage.rst for
-	  more detail) or via an option on the mount command. This support
-	  is disabled by default in order to reduce the possibility of a
-	  downgrade attack.
-
-	  If unsure, say N.
-
 config CIFS_UPCALL
 	bool "Kerberos/SPNEGO advanced session setup"
 	depends on CIFS

fs/cifs/cifs_debug.c

@@ -250,9 +250,6 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 #ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
 	seq_printf(m, ",ALLOW_INSECURE_LEGACY");
 #endif
-#ifdef CONFIG_CIFS_WEAK_PW_HASH
-	seq_printf(m, ",WEAK_PW_HASH");
-#endif
 #ifdef CONFIG_CIFS_POSIX
 	seq_printf(m, ",CIFS_POSIX");
 #endif
@@ -929,14 +926,6 @@ cifs_security_flags_handle_must_flags(unsigned int *flags)
 		*flags = CIFSSEC_MUST_NTLMSSP;
 	else if ((*flags & CIFSSEC_MUST_NTLMV2) == CIFSSEC_MUST_NTLMV2)
 		*flags = CIFSSEC_MUST_NTLMV2;
-	else if ((*flags & CIFSSEC_MUST_NTLM) == CIFSSEC_MUST_NTLM)
-		*flags = CIFSSEC_MUST_NTLM;
-	else if (CIFSSEC_MUST_LANMAN &&
-		 (*flags & CIFSSEC_MUST_LANMAN) == CIFSSEC_MUST_LANMAN)
-		*flags = CIFSSEC_MUST_LANMAN;
-	else if (CIFSSEC_MUST_PLNTXT &&
-		 (*flags & CIFSSEC_MUST_PLNTXT) == CIFSSEC_MUST_PLNTXT)
-		*flags = CIFSSEC_MUST_PLNTXT;
 
 	*flags |= signflags;
 }

fs/cifs/cifs_swn.c

@@ -147,8 +147,6 @@ static int cifs_swn_send_register_message(struct cifs_swn_reg *swnreg)
 			goto nlmsg_fail;
 		}
 		break;
-	case LANMAN:
-	case NTLM:
 	case NTLMv2:
 	case RawNTLMSSP:
 		ret = cifs_swn_auth_info_ntlm(swnreg->tcon, skb);

fs/cifs/cifs_unicode.c

@@ -358,14 +358,9 @@ cifs_strndup_from_utf16(const char *src, const int maxlen,
 		if (!dst)
 			return NULL;
 		cifs_from_utf16(dst, (__le16 *) src, len, maxlen, codepage,
-			       NO_MAP_UNI_RSVD);
+				NO_MAP_UNI_RSVD);
 	} else {
-		len = strnlen(src, maxlen);
-		len++;
-		dst = kmalloc(len, GFP_KERNEL);
-		if (!dst)
-			return NULL;
-		strlcpy(dst, src, len);
+		dst = kstrndup(src, maxlen, GFP_KERNEL);
 	}
 
 	return dst;

fs/cifs/cifsencrypt.c

@@ -22,7 +22,7 @@
 #include <linux/random.h>
 #include <linux/highmem.h>
 #include <linux/fips.h>
-#include <crypto/arc4.h>
+#include "../cifs_common/arc4.h"
 #include <crypto/aead.h>
 
 int __cifs_calc_signature(struct smb_rqst *rqst,
@@ -250,87 +250,6 @@ int cifs_verify_signature(struct smb_rqst *rqst,
 
 }
 
-/* first calculate 24 bytes ntlm response and then 16 byte session key */
-int setup_ntlm_response(struct cifs_ses *ses, const struct nls_table *nls_cp)
-{
-	int rc = 0;
-	unsigned int temp_len = CIFS_SESS_KEY_SIZE + CIFS_AUTH_RESP_SIZE;
-	char temp_key[CIFS_SESS_KEY_SIZE];
-
-	if (!ses)
-		return -EINVAL;
-
-	ses->auth_key.response = kmalloc(temp_len, GFP_KERNEL);
-	if (!ses->auth_key.response)
-		return -ENOMEM;
-
-	ses->auth_key.len = temp_len;
-
-	rc = SMBNTencrypt(ses->password, ses->server->cryptkey,
-			ses->auth_key.response + CIFS_SESS_KEY_SIZE, nls_cp);
-	if (rc) {
-		cifs_dbg(FYI, "%s Can't generate NTLM response, error: %d\n",
-			 __func__, rc);
-		return rc;
-	}
-
-	rc = E_md4hash(ses->password, temp_key, nls_cp);
-	if (rc) {
-		cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n",
-			 __func__, rc);
-		return rc;
-	}
-
-	rc = mdfour(ses->auth_key.response, temp_key, CIFS_SESS_KEY_SIZE);
-	if (rc)
-		cifs_dbg(FYI, "%s Can't generate NTLM session key, error: %d\n",
-			 __func__, rc);
-
-	return rc;
-}
-
-#ifdef CONFIG_CIFS_WEAK_PW_HASH
-int calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
-			char *lnm_session_key)
-{
-	int i, len;
-	int rc;
-	char password_with_pad[CIFS_ENCPWD_SIZE] = {0};
-
-	if (password) {
-		for (len = 0; len < CIFS_ENCPWD_SIZE; len++)
-			if (!password[len])
-				break;
-
-		memcpy(password_with_pad, password, len);
-	}
-
-	if (!encrypt && global_secflags & CIFSSEC_MAY_PLNTXT) {
-		memcpy(lnm_session_key, password_with_pad,
-			CIFS_ENCPWD_SIZE);
-		return 0;
-	}
-
-	/* calculate old style session key */
-	/* calling toupper is less broken than repeatedly
-	calling nls_toupper would be since that will never
-	work for UTF8, but neither handles multibyte code pages
-	but the only alternative would be converting to UCS-16 (Unicode)
-	(using a routine something like UniStrupr) then
-	uppercasing and then converting back from Unicode - which
-	would only worth doing it if we knew it were utf8. Basically
-	utf8 and other multibyte codepages each need their own strupper
-	function since a byte at a time will ont work. */
-
-	for (i = 0; i < CIFS_ENCPWD_SIZE; i++)
-		password_with_pad[i] = toupper(password_with_pad[i]);
-
-	rc = SMBencrypt(password_with_pad, cryptkey, lnm_session_key);
-
-	return rc;
-}
-#endif /* CIFS_WEAK_PW_HASH */
-
 /* Build a proper attribute value/target info pairs blob.
  * Fill in netbios and dns domain name and workstation name
  * and client time (total five av pairs and + one end of fields indicator.
@@ -780,9 +699,9 @@ calc_seckey(struct cifs_ses *ses)
 		return -ENOMEM;
 	}
 
-	arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
-	arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
-		   CIFS_CPHTXT_SIZE);
+	cifs_arc4_setkey(ctx_arc4, ses->auth_key.response, CIFS_SESS_KEY_SIZE);
+	cifs_arc4_crypt(ctx_arc4, ses->ntlmssp->ciphertext, sec_key,
+			CIFS_CPHTXT_SIZE);
 
 	/* make secondary_key/nonce as session key */
 	memcpy(ses->auth_key.response, sec_key, CIFS_SESS_KEY_SIZE);

fs/cifs/cifsfs.c

@@ -399,7 +399,6 @@ cifs_evict_inode(struct inode *inode)
 {
 	truncate_inode_pages_final(&inode->i_data);
 	clear_inode(inode);
-	cifs_fscache_release_inode_cookie(inode);
 }
 
 static void
@@ -438,15 +437,9 @@ cifs_show_security(struct seq_file *s, struct cifs_ses *ses)
 	seq_puts(s, ",sec=");
 
 	switch (ses->sectype) {
-	case LANMAN:
-		seq_puts(s, "lanman");
-		break;
 	case NTLMv2:
 		seq_puts(s, "ntlmv2");
 		break;
-	case NTLM:
-		seq_puts(s, "ntlm");
-		break;
 	case Kerberos:
 		seq_puts(s, "krb5");
 		break;
@@ -1755,7 +1748,6 @@ MODULE_DESCRIPTION
 MODULE_VERSION(CIFS_VERSION);
 MODULE_SOFTDEP("ecb");
 MODULE_SOFTDEP("hmac");
-MODULE_SOFTDEP("md4");
 MODULE_SOFTDEP("md5");
 MODULE_SOFTDEP("nls");
 MODULE_SOFTDEP("aes");

fs/cifs/cifsglob.h

@@ -114,8 +114,6 @@ enum statusEnum {
 
 enum securityEnum {
 	Unspecified = 0,	/* not specified */
-	LANMAN,			/* Legacy LANMAN auth */
-	NTLM,			/* Legacy NTLM012 auth with NTLM hash */
 	NTLMv2,			/* Legacy NTLM auth with NTLMv2 hash */
 	RawNTLMSSP,		/* NTLMSSP without SPNEGO, NTLMv2 hash */
 	Kerberos,		/* Kerberos via SPNEGO */
@@ -634,7 +632,6 @@ struct TCP_Server_Info {
 	struct session_key session_key;
 	unsigned long lstrp; /* when we got last response from this server */
 	struct cifs_secmech secmech; /* crypto sec mech functs, descriptors */
-#define	CIFS_NEGFLAVOR_LANMAN	0	/* wct == 13, LANMAN */
 #define	CIFS_NEGFLAVOR_UNENCAP	1	/* wct == 17, but no ext_sec */
 #define	CIFS_NEGFLAVOR_EXTENDED	2	/* wct == 17, ext_sec bit set */
 	char	negflavor;	/* NEGOTIATE response flavor */
@@ -1734,49 +1731,28 @@ static inline bool is_retryable_error(int error)
 
 /* Security Flags: indicate type of session setup needed */
 #define   CIFSSEC_MAY_SIGN	0x00001
-#define   CIFSSEC_MAY_NTLM	0x00002
 #define   CIFSSEC_MAY_NTLMV2	0x00004
 #define   CIFSSEC_MAY_KRB5	0x00008
-#ifdef CONFIG_CIFS_WEAK_PW_HASH
-#define   CIFSSEC_MAY_LANMAN	0x00010
-#define   CIFSSEC_MAY_PLNTXT	0x00020
-#else
-#define   CIFSSEC_MAY_LANMAN    0
-#define   CIFSSEC_MAY_PLNTXT    0
-#endif /* weak passwords */
 #define   CIFSSEC_MAY_SEAL	0x00040 /* not supported yet */
 #define   CIFSSEC_MAY_NTLMSSP	0x00080 /* raw ntlmssp with ntlmv2 */
 
 #define   CIFSSEC_MUST_SIGN	0x01001
 /* note that only one of the following can be set so the
 result of setting MUST flags more than once will be to
 require use of the stronger protocol */
-#define   CIFSSEC_MUST_NTLM	0x02002
 #define   CIFSSEC_MUST_NTLMV2	0x04004
 #define   CIFSSEC_MUST_KRB5	0x08008
-#ifdef CONFIG_CIFS_WEAK_PW_HASH
-#define   CIFSSEC_MUST_LANMAN	0x10010
-#define   CIFSSEC_MUST_PLNTXT	0x20020
-#ifdef CONFIG_CIFS_UPCALL
-#define   CIFSSEC_MASK          0xBF0BF /* allows weak security but also krb5 */
-#else
-#define   CIFSSEC_MASK          0xB70B7 /* current flags supported if weak */
-#endif /* UPCALL */
-#else /* do not allow weak pw hash */
-#define   CIFSSEC_MUST_LANMAN	0
-#define   CIFSSEC_MUST_PLNTXT	0
 #ifdef CONFIG_CIFS_UPCALL
 #define   CIFSSEC_MASK          0x8F08F /* flags supported if no weak allowed */
 #else
 #define	  CIFSSEC_MASK          0x87087 /* flags supported if no weak allowed */
 #endif /* UPCALL */
-#endif /* WEAK_PW_HASH */
 #define   CIFSSEC_MUST_SEAL	0x40040 /* not supported yet */
 #define   CIFSSEC_MUST_NTLMSSP	0x80080 /* raw ntlmssp with ntlmv2 */
 
 #define   CIFSSEC_DEF (CIFSSEC_MAY_SIGN | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_NTLMSSP)
-#define   CIFSSEC_MAX (CIFSSEC_MUST_SIGN | CIFSSEC_MUST_NTLMV2)
-#define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLM | CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_LANMAN | CIFSSEC_MAY_PLNTXT | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
+#define   CIFSSEC_MAX (CIFSSEC_MUST_NTLMV2)
+#define   CIFSSEC_AUTH_MASK (CIFSSEC_MAY_NTLMV2 | CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_NTLMSSP)
 /*
  *****************************************************************
  * All constants go here
@@ -1940,10 +1916,6 @@ static inline char *get_security_type_str(enum securityEnum sectype)
 		return "Kerberos";
 	case NTLMv2:
 		return "NTLMv2";
-	case NTLM:
-		return "NTLM";
-	case LANMAN:
-		return "LANMAN";
 	default:
 		return "Unknown";
 	}