smbencrypt.c 7.5 KB

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  1. /*
  2. Unix SMB/Netbios implementation.
  3. Version 1.9.
  4. SMB parameters and setup
  5. Copyright (C) Andrew Tridgell 1992-2000
  6. Copyright (C) Luke Kenneth Casson Leighton 1996-2000
  7. Modified by Jeremy Allison 1995.
  8. Copyright (C) Andrew Bartlett <abartlet@samba.org> 2002-2003
  9. Modified by Steve French (sfrench@us.ibm.com) 2002-2003
  10. This program is free software; you can redistribute it and/or modify
  11. it under the terms of the GNU General Public License as published by
  12. the Free Software Foundation; either version 2 of the License, or
  13. (at your option) any later version.
  14. This program is distributed in the hope that it will be useful,
  15. but WITHOUT ANY WARRANTY; without even the implied warranty of
  16. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17. GNU General Public License for more details.
  18. You should have received a copy of the GNU General Public License
  19. along with this program; if not, write to the Free Software
  20. Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21. */
  22. #include <linux/module.h>
  23. #include <linux/fs.h>
  24. #include <linux/string.h>
  25. #include <linux/kernel.h>
  26. #include <linux/random.h>
  27. #include "cifs_unicode.h"
  28. #include "cifspdu.h"
  29. #include "cifsglob.h"
  30. #include "md5.h"
  31. #include "cifs_debug.h"
  32. #include "cifsencrypt.h"
  33. #ifndef FALSE
  34. #define FALSE 0
  35. #endif
  36. #ifndef TRUE
  37. #define TRUE 1
  38. #endif
  39. /* following came from the other byteorder.h to avoid include conflicts */
  40. #define CVAL(buf,pos) (((unsigned char *)(buf))[pos])
  41. #define SSVALX(buf,pos,val) (CVAL(buf,pos)=(val)&0xFF,CVAL(buf,pos+1)=(val)>>8)
  42. #define SSVAL(buf,pos,val) SSVALX((buf),(pos),((__u16)(val)))
  43. /*The following definitions come from libsmb/smbencrypt.c */
  44. void SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
  45. void E_md4hash(const unsigned char *passwd, unsigned char *p16);
  46. static void SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
  47. unsigned char p24[24]);
  48. void SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24);
  49. /*
  50. This implements the X/Open SMB password encryption
  51. It takes a password, a 8 byte "crypt key" and puts 24 bytes of
  52. encrypted password into p24 */
  53. /* Note that password must be uppercased and null terminated */
  54. void
  55. SMBencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
  56. {
  57. unsigned char p14[15], p21[21];
  58. memset(p21, '\0', 21);
  59. memset(p14, '\0', 14);
  60. strncpy((char *) p14, (char *) passwd, 14);
  61. /* strupper((char *)p14); *//* BB at least uppercase the easy range */
  62. E_P16(p14, p21);
  63. SMBOWFencrypt(p21, c8, p24);
  64. memset(p14,0,15);
  65. memset(p21,0,21);
  66. }
  67. /* Routines for Windows NT MD4 Hash functions. */
  68. static int
  69. _my_wcslen(__u16 * str)
  70. {
  71. int len = 0;
  72. while (*str++ != 0)
  73. len++;
  74. return len;
  75. }
  76. /*
  77. * Convert a string into an NT UNICODE string.
  78. * Note that regardless of processor type
  79. * this must be in intel (little-endian)
  80. * format.
  81. */
  82. static int
  83. _my_mbstowcs(__u16 * dst, const unsigned char *src, int len)
  84. { /* not a very good conversion routine - change/fix */
  85. int i;
  86. __u16 val;
  87. for (i = 0; i < len; i++) {
  88. val = *src;
  89. SSVAL(dst, 0, val);
  90. dst++;
  91. src++;
  92. if (val == 0)
  93. break;
  94. }
  95. return i;
  96. }
  97. /*
  98. * Creates the MD4 Hash of the users password in NT UNICODE.
  99. */
  100. void
  101. E_md4hash(const unsigned char *passwd, unsigned char *p16)
  102. {
  103. int len;
  104. __u16 wpwd[129];
  105. /* Password cannot be longer than 128 characters */
  106. if(passwd) {
  107. len = strlen((char *) passwd);
  108. if (len > 128) {
  109. len = 128;
  110. }
  111. /* Password must be converted to NT unicode */
  112. _my_mbstowcs(wpwd, passwd, len);
  113. } else
  114. len = 0;
  115. wpwd[len] = 0; /* Ensure string is null terminated */
  116. /* Calculate length in bytes */
  117. len = _my_wcslen(wpwd) * sizeof (__u16);
  118. mdfour(p16, (unsigned char *) wpwd, len);
  119. memset(wpwd,0,129 * 2);
  120. }
  121. #if 0 /* currently unused */
  122. /* Does both the NT and LM owfs of a user's password */
  123. static void
  124. nt_lm_owf_gen(char *pwd, unsigned char nt_p16[16], unsigned char p16[16])
  125. {
  126. char passwd[514];
  127. memset(passwd, '\0', 514);
  128. if (strlen(pwd) < 513)
  129. strcpy(passwd, pwd);
  130. else
  131. memcpy(passwd, pwd, 512);
  132. /* Calculate the MD4 hash (NT compatible) of the password */
  133. memset(nt_p16, '\0', 16);
  134. E_md4hash(passwd, nt_p16);
  135. /* Mangle the passwords into Lanman format */
  136. passwd[14] = '\0';
  137. /* strupper(passwd); */
  138. /* Calculate the SMB (lanman) hash functions of the password */
  139. memset(p16, '\0', 16);
  140. E_P16((unsigned char *) passwd, (unsigned char *) p16);
  141. /* clear out local copy of user's password (just being paranoid). */
  142. memset(passwd, '\0', sizeof (passwd));
  143. }
  144. #endif
  145. /* Does the NTLMv2 owfs of a user's password */
  146. #if 0 /* function not needed yet - but will be soon */
  147. static void
  148. ntv2_owf_gen(const unsigned char owf[16], const char *user_n,
  149. const char *domain_n, unsigned char kr_buf[16],
  150. const struct nls_table *nls_codepage)
  151. {
  152. wchar_t * user_u;
  153. wchar_t * dom_u;
  154. int user_l, domain_l;
  155. struct HMACMD5Context ctx;
  156. /* might as well do one alloc to hold both (user_u and dom_u) */
  157. user_u = kmalloc(2048 * sizeof(wchar_t),GFP_KERNEL);
  158. if(user_u == NULL)
  159. return;
  160. dom_u = user_u + 1024;
  161. /* push_ucs2(NULL, user_u, user_n, (user_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER);
  162. push_ucs2(NULL, dom_u, domain_n, (domain_l+1)*2, STR_UNICODE|STR_NOALIGN|STR_TERMINATE|STR_UPPER); */
  163. /* BB user and domain may need to be uppercased */
  164. user_l = cifs_strtoUCS(user_u, user_n, 511, nls_codepage);
  165. domain_l = cifs_strtoUCS(dom_u, domain_n, 511, nls_codepage);
  166. user_l++; /* trailing null */
  167. domain_l++;
  168. hmac_md5_init_limK_to_64(owf, 16, &ctx);
  169. hmac_md5_update((const unsigned char *) user_u, user_l * 2, &ctx);
  170. hmac_md5_update((const unsigned char *) dom_u, domain_l * 2, &ctx);
  171. hmac_md5_final(kr_buf, &ctx);
  172. kfree(user_u);
  173. }
  174. #endif
  175. /* Does the des encryption from the NT or LM MD4 hash. */
  176. static void
  177. SMBOWFencrypt(unsigned char passwd[16], unsigned char *c8,
  178. unsigned char p24[24])
  179. {
  180. unsigned char p21[21];
  181. memset(p21, '\0', 21);
  182. memcpy(p21, passwd, 16);
  183. E_P24(p21, c8, p24);
  184. }
  185. /* Does the des encryption from the FIRST 8 BYTES of the NT or LM MD4 hash. */
  186. #if 0 /* currently unused */
  187. static void
  188. NTLMSSPOWFencrypt(unsigned char passwd[8],
  189. unsigned char *ntlmchalresp, unsigned char p24[24])
  190. {
  191. unsigned char p21[21];
  192. memset(p21, '\0', 21);
  193. memcpy(p21, passwd, 8);
  194. memset(p21 + 8, 0xbd, 8);
  195. E_P24(p21, ntlmchalresp, p24);
  196. }
  197. #endif
  198. /* Does the NT MD4 hash then des encryption. */
  199. void
  200. SMBNTencrypt(unsigned char *passwd, unsigned char *c8, unsigned char *p24)
  201. {
  202. unsigned char p21[21];
  203. memset(p21, '\0', 21);
  204. E_md4hash(passwd, p21);
  205. SMBOWFencrypt(p21, c8, p24);
  206. }
  207. /* Does the md5 encryption from the NT hash for NTLMv2. */
  208. /* These routines will be needed later */
  209. #if 0
  210. static void
  211. SMBOWFencrypt_ntv2(const unsigned char kr[16],
  212. const struct data_blob * srv_chal,
  213. const struct data_blob * cli_chal, unsigned char resp_buf[16])
  214. {
  215. struct HMACMD5Context ctx;
  216. hmac_md5_init_limK_to_64(kr, 16, &ctx);
  217. hmac_md5_update(srv_chal->data, srv_chal->length, &ctx);
  218. hmac_md5_update(cli_chal->data, cli_chal->length, &ctx);
  219. hmac_md5_final(resp_buf, &ctx);
  220. }
  221. static void
  222. SMBsesskeygen_ntv2(const unsigned char kr[16],
  223. const unsigned char *nt_resp, __u8 sess_key[16])
  224. {
  225. struct HMACMD5Context ctx;
  226. hmac_md5_init_limK_to_64(kr, 16, &ctx);
  227. hmac_md5_update(nt_resp, 16, &ctx);
  228. hmac_md5_final((unsigned char *) sess_key, &ctx);
  229. }
  230. static void
  231. SMBsesskeygen_ntv1(const unsigned char kr[16],
  232. const unsigned char *nt_resp, __u8 sess_key[16])
  233. {
  234. mdfour((unsigned char *) sess_key, (unsigned char *) kr, 16);
  235. }
  236. #endif