1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 Unix SMB/Netbios implementation. 4 Version 1.9. 5 SMB parameters and setup 6 Copyright (C) Andrew Tridgell 1992-2000 7 Copyright (C) Luke Kenneth Casson Leighton 1996-2000 8 Modified by Jeremy Allison 1995. 9 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003 10 Modified by Steve French (sfrench@us.ibm.com) 2002-2003 11 12*/ 13 14#include <linux/module.h> 15#include <linux/slab.h> 16#include <linux/fips.h> 17#include <linux/fs.h> 18#include <linux/string.h> 19#include <linux/kernel.h> 20#include <linux/random.h> 21#include <crypto/des.h> 22#include "cifs_fs_sb.h" 23#include "cifs_unicode.h" 24#include "cifspdu.h" 25#include "cifsglob.h" 26#include "cifs_debug.h" 27#include "cifsproto.h" 28 29#ifndef false 30#define false 0 31#endif 32#ifndef true 33#define true 1 34#endif 35 36/* following came from the other byteorder.h to avoid include conflicts */ 37#define CVAL(buf,pos) (((unsigned char *)(buf))[pos]) 38#define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8) 39#define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val))) 40 41static void 42str_to_key(unsigned char *str, unsigned char *key) 43{ 44 int i; 45 46 key[0] = str[0] >> 1; 47 key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2); 48 key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3); 49 key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4); 50 key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5); 51 key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6); 52 key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7); 53 key[7] = str[6] & 0x7F; 54 for (i = 0; i < 8; i++) 55 key[i] = (key[i] << 1); 56} 57 58static int 59smbhash(unsigned char *out, const unsigned char *in, unsigned char *key) 60{ 61 unsigned char key2[8]; 62 struct des_ctx ctx; 63 64 str_to_key(key, key2); 65 66 if (fips_enabled) { 67 cifs_dbg(VFS, "FIPS compliance enabled: DES not permitted\n"); 68 return -ENOENT; 69 } 70 71 des_expand_key(&ctx, key2, DES_KEY_SIZE); 72 des_encrypt(&ctx, out, in); 73 memzero_explicit(&ctx, sizeof(ctx)); 74 75 return 0; 76} 77 78static int 79E_P16(unsigned char *p14, unsigned char *p16) 80{ 81 int rc; 82 unsigned char sp8[8] = 83 { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 }; 84 85 rc = smbhash(p16, sp8, p14); 86 if (rc) 87 return rc; 88 rc = smbhash(p16 + 8, sp8, p14 + 7); 89 return rc; 90} 91 92static int 93E_P24(unsigned char *p21, const unsigned char *c8, unsigned char *p24) 94{ 95 int rc; 96 97 rc = smbhash(p24, c8, p21); 98 if (rc) 99 return rc; 100 rc = smbhash(p24 + 8, c8, p21 + 7); 101 if (rc) 102 return rc; 103 rc = smbhash(p24 + 16, c8, p21 + 14); 104 return rc; 105} 106 107/* produce a md4 message digest from data of length n bytes */ 108int 109mdfour(unsigned char *md4_hash, unsigned char *link_str, int link_len) 110{ 111 int rc; 112 struct crypto_shash *md4 = NULL; 113 struct sdesc *sdescmd4 = NULL; 114 115 rc = cifs_alloc_hash("md4", &md4, &sdescmd4); 116 if (rc) 117 goto mdfour_err; 118 119 rc = crypto_shash_init(&sdescmd4->shash); 120 if (rc) { 121 cifs_dbg(VFS, "%s: Could not init md4 shash\n", __func__); 122 goto mdfour_err; 123 } 124 rc = crypto_shash_update(&sdescmd4->shash, link_str, link_len); 125 if (rc) { 126 cifs_dbg(VFS, "%s: Could not update with link_str\n", __func__); 127 goto mdfour_err; 128 } 129 rc = crypto_shash_final(&sdescmd4->shash, md4_hash); 130 if (rc) 131 cifs_dbg(VFS, "%s: Could not generate md4 hash\n", __func__); 132 133mdfour_err: 134 cifs_free_hash(&md4, &sdescmd4); 135 return rc; 136} 137 138/* 139 This implements the X/Open SMB password encryption 140 It takes a password, a 8 byte "crypt key" and puts 24 bytes of 141 encrypted password into p24 */ 142/* Note that password must be uppercased and null terminated */ 143int 144SMBencrypt(unsigned char *passwd, const unsigned char *c8, unsigned char *p24) 145{ 146 int rc; 147 unsigned char p14[14], p16[16], p21[21]; 148 149 memset(p14, '\0', 14); 150 memset(p16, '\0', 16); 151 memset(p21, '\0', 21); 152 153 memcpy(p14, passwd, 14); 154 rc = E_P16(p14, p16); 155 if (rc) 156 return rc; 157 158 memcpy(p21, p16, 16); 159 rc = E_P24(p21, c8, p24); 160 161 return rc; 162} 163 164/* 165 * Creates the MD4 Hash of the users password in NT UNICODE. 166 */ 167 168int 169E_md4hash(const unsigned char *passwd, unsigned char *p16, 170 const struct nls_table *codepage) 171{ 172 int rc; 173 int len; 174 __le16 wpwd[129]; 175 176 /* Password cannot be longer than 128 characters */ 177 if (passwd) /* Password must be converted to NT unicode */ 178 len = cifs_strtoUTF16(wpwd, passwd, 128, codepage); 179 else { 180 len = 0; 181 *wpwd = 0; /* Ensure string is null terminated */ 182 } 183 184 rc = mdfour(p16, (unsigned char *) wpwd, len * sizeof(__le16)); 185 memzero_explicit(wpwd, sizeof(wpwd)); 186 187 return rc; 188} 189 190/* Does the NT MD4 hash then des encryption. */ 191int 192SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24, 193 const struct nls_table *codepage) 194{ 195 int rc; 196 unsigned char p16[16], p21[21]; 197 198 memset(p16, '\0', 16); 199 memset(p21, '\0', 21); 200 201 rc = E_md4hash(passwd, p16, codepage); 202 if (rc) { 203 cifs_dbg(FYI, "%s Can't generate NT hash, error: %d\n", 204 __func__, rc); 205 return rc; 206 } 207 memcpy(p21, p16, 16); 208 rc = E_P24(p21, c8, p24); 209 return rc; 210} 211