gss_krb5_seal.c 4.3 KB

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  1. /*
  2. * linux/net/sunrpc/gss_krb5_seal.c
  3. *
  4. * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c
  5. *
  6. * Copyright (c) 2000 The Regents of the University of Michigan.
  7. * All rights reserved.
  8. *
  9. * Andy Adamson <andros@umich.edu>
  10. * J. Bruce Fields <bfields@umich.edu>
  11. */
  12. /*
  13. * Copyright 1993 by OpenVision Technologies, Inc.
  14. *
  15. * Permission to use, copy, modify, distribute, and sell this software
  16. * and its documentation for any purpose is hereby granted without fee,
  17. * provided that the above copyright notice appears in all copies and
  18. * that both that copyright notice and this permission notice appear in
  19. * supporting documentation, and that the name of OpenVision not be used
  20. * in advertising or publicity pertaining to distribution of the software
  21. * without specific, written prior permission. OpenVision makes no
  22. * representations about the suitability of this software for any
  23. * purpose. It is provided "as is" without express or implied warranty.
  24. *
  25. * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  26. * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  27. * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  28. * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
  29. * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
  30. * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  31. * PERFORMANCE OF THIS SOFTWARE.
  32. */
  33. /*
  34. * Copyright (C) 1998 by the FundsXpress, INC.
  35. *
  36. * All rights reserved.
  37. *
  38. * Export of this software from the United States of America may require
  39. * a specific license from the United States Government. It is the
  40. * responsibility of any person or organization contemplating export to
  41. * obtain such a license before exporting.
  42. *
  43. * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
  44. * distribute this software and its documentation for any purpose and
  45. * without fee is hereby granted, provided that the above copyright
  46. * notice appear in all copies and that both that copyright notice and
  47. * this permission notice appear in supporting documentation, and that
  48. * the name of FundsXpress. not be used in advertising or publicity pertaining
  49. * to distribution of the software without specific, written prior
  50. * permission. FundsXpress makes no representations about the suitability of
  51. * this software for any purpose. It is provided "as is" without express
  52. * or implied warranty.
  53. *
  54. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  55. * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  56. * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  57. */
  58. #include <linux/types.h>
  59. #include <linux/slab.h>
  60. #include <linux/jiffies.h>
  61. #include <linux/sunrpc/gss_krb5.h>
  62. #include <linux/random.h>
  63. #include <asm/scatterlist.h>
  64. #include <linux/crypto.h>
  65. #ifdef RPC_DEBUG
  66. # define RPCDBG_FACILITY RPCDBG_AUTH
  67. #endif
  68. DEFINE_SPINLOCK(krb5_seq_lock);
  69. u32
  70. gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
  71. struct xdr_netobj *token)
  72. {
  73. struct krb5_ctx *ctx = gss_ctx->internal_ctx_id;
  74. char cksumdata[16];
  75. struct xdr_netobj md5cksum = {.len = 0, .data = cksumdata};
  76. unsigned char *ptr, *krb5_hdr, *msg_start;
  77. s32 now;
  78. u32 seq_send;
  79. dprintk("RPC: gss_krb5_seal\n");
  80. now = get_seconds();
  81. token->len = g_token_size(&ctx->mech_used, 22);
  82. ptr = token->data;
  83. g_make_token_header(&ctx->mech_used, 22, &ptr);
  84. *ptr++ = (unsigned char) ((KG_TOK_MIC_MSG>>8)&0xff);
  85. *ptr++ = (unsigned char) (KG_TOK_MIC_MSG&0xff);
  86. /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */
  87. krb5_hdr = ptr - 2;
  88. msg_start = krb5_hdr + 24;
  89. *(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
  90. memset(krb5_hdr + 4, 0xff, 4);
  91. if (make_checksum("md5", krb5_hdr, 8, text, 0, &md5cksum))
  92. return GSS_S_FAILURE;
  93. if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
  94. md5cksum.data, md5cksum.len))
  95. return GSS_S_FAILURE;
  96. memcpy(krb5_hdr + 16, md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
  97. KRB5_CKSUM_LENGTH);
  98. spin_lock(&krb5_seq_lock);
  99. seq_send = ctx->seq_send++;
  100. spin_unlock(&krb5_seq_lock);
  101. if (krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff,
  102. ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8))
  103. return GSS_S_FAILURE;
  104. return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
  105. }