// SPDX-License-Identifier: GPL-2.0-or-later /* Unix SMB/Netbios implementation. Version 1.9. SMB parameters and setup Copyright (C) Andrew Tridgell 1992-2000 Copyright (C) Luke Kenneth Casson Leighton 1996-2000 Modified by Jeremy Allison 1995. Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003 Modified by Steve French (sfrench@us.ibm.com) 2002-2003 */ #include <linux/module.h> #include <linux/slab.h> #include <linux/fips.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/random.h> #include <crypto/des.h> #include "cifs_fs_sb.h" #include "cifs_unicode.h" #include "cifspdu.h" #include "cifsglob.h" #include "cifs_debug.h" #include "cifsproto.h" #ifndef false #define false 0 #endif #ifndef true #define true 1 #endif /* following came from the other byteorder.h to avoid include conflicts */ #define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8) #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val))) static void str_to_key(unsigned char *str, unsigned char *key) { int i; key[0] = str[0] >> 1; key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2); key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3); key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4); key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5); key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6); key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7); key[7] = str[6] & 0x7F; for (i = 0; i < 8; i++) key[i] = (key[i] << 1); } static int smbhash(unsigned char *out, const unsigned char *in, unsigned char *key) { unsigned char key2[8]; struct des_ctx ctx; str_to_key(key, key2); if (fips_enabled) { cifs_dbg(VFS, "FIPS compliance enabled: DES not permitted\n"); return -ENOENT; } des_expand_key(&ctx, key2, DES_KEY_SIZE); des_encrypt(&ctx, out, in); memzero_explicit(&ctx, sizeof(ctx)); return 0; } static int E_P16(unsigned char *p14, unsigned char *p16) { int rc; unsigned char sp8[8] = { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 }; rc = smbhash(p16, sp8, p14); if (rc) return rc; rc = smbhash(p16 + 8, sp8, p14 + 7); return rc; } static int E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24) { int rc; rc = smbhash(p24, c8, p21); if (rc) return rc; rc = smbhash(p24 + 8, c8, p21 + 7); if (rc) return rc; rc = smbhash(p24 + 16, c8, p21 + 14); return rc; } /* produce a md4 message digest from data of length n bytes */ int mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len) { int rc; struct crypto_shash *md4 = NULL; struct sdesc *sdescmd4 = NULL; rc = cifs_alloc_hash("md4", &md4, &sdescmd4); if (rc) goto mdfour_err; rc = crypto_shash_init(&sdescmd4->shash); if (rc) { cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__); goto mdfour_err; } rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len); if (rc) { cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); goto mdfour_err; } rc = crypto_shash_final(&sdescmd4->shash, md4_hash); if (rc) cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__); mdfour_err: cifs_free_hash(&md4, &sdescmd4); return rc; } /* This implements the X/Open SMB password encryption It takes a password, a 8 byte "crypt key" and puts 24 bytes of encrypted password into p24 */ /* Note that password must be uppercased and null terminated */ int SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24) { int rc; unsigned char p14[14], p16[16], p21[21]; memset(p14, '\0', 14); memset(p16, '\0', 16); memset(p21, '\0', 21); memcpy(p14, passwd, 14); rc = E_P16(p14, p16); if (rc) return rc; memcpy(p21, p16, 16); rc = E_P24(p21, c8, p24); return rc; } /* * Creates the MD4 Hash of the users password in NT UNICODE. */ int E_md4hash(const unsigned char *passwd, unsigned char *p16, const struct nls_table *codepage) { int rc; int len; __le16 wpwd[129]; /* Password cannot be longer than 128 characters */ if (passwd) /* Password must be converted to NT unicode */ len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); else { len = 0; *wpwd = 0; /* Ensure string is null terminated */ } rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); memzero_explicit(wpwd, sizeof(wpwd)); return rc; } /* Does the NT MD4 hash then des encryption. */ int SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24, const struct nls_table *codepage) { int rc; unsigned char p16[16], p21[21]; memset(p16, '\0', 16); memset(p21, '\0', 21); rc = E_md4hash(passwd, p16, codepage); if (rc) { cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", __func__, rc); return rc; } memcpy(p21, p16, 16); rc = E_P24(p21, c8, p24); return rc; }