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Linux/fs/cifs/smbencrypt.c

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  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/crypto.h>
 15 #include <linux/module.h>
 16 #include <linux/slab.h>
 17 #include <linux/fs.h>
 18 #include <linux/string.h>
 19 #include <linux/kernel.h>
 20 #include <linux/random.h>
 21 #include "cifs_fs_sb.h"
 22 #include "cifs_unicode.h"
 23 #include "cifspdu.h"
 24 #include "cifsglob.h"
 25 #include "cifs_debug.h"
 26 #include "cifsproto.h"
 27 
 28 #ifndef false
 29 #define false 0
 30 #endif
 31 #ifndef true
 32 #define true 1
 33 #endif
 34 
 35 /* following came from the other byteorder.h to avoid include conflicts */
 36 #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
 37 #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
 38 #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
 39 
 40 static void
 41 str_to_key(unsigned char *str, unsigned char *key)
 42 {
 43         int i;
 44 
 45         key[0] = str[0] >> 1;
 46         key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
 47         key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
 48         key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
 49         key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
 50         key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
 51         key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
 52         key[7] = str[6] & 0x7F;
 53         for (i = 0; i < 8; i++)
 54                 key[i] = (key[i] << 1);
 55 }
 56 
 57 static int
 58 smbhash(unsigned char *out, const unsigned char *in, unsigned char *key)
 59 {
 60         unsigned char key2[8];
 61         struct crypto_cipher *tfm_des;
 62 
 63         str_to_key(key, key2);
 64 
 65         tfm_des = crypto_alloc_cipher("des", 0, 0);
 66         if (IS_ERR(tfm_des)) {
 67                 cifs_dbg(VFS, "could not allocate des crypto API\n");
 68                 return PTR_ERR(tfm_des);
 69         }
 70 
 71         crypto_cipher_setkey(tfm_des, key2, 8);
 72         crypto_cipher_encrypt_one(tfm_des, out, in);
 73         crypto_free_cipher(tfm_des);
 74 
 75         return 0;
 76 }
 77 
 78 static int
 79 E_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 
 92 static int
 93 E_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 */
108 int
109 mdfour(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 
133 mdfour_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 */
143 int
144 SMBencrypt(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 
168 int
169 E_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. */
191 int
192 SMBNTencrypt(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 

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