/* * linux/net/sunrpc/gss_krb5_seqnum.c * * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/util_seqnum.c * * Copyright (c) 2000 The Regents of the University of Michigan. * All rights reserved. * * Andy Adamson <andros@umich.edu> */ /* * Copyright 1993 by OpenVision Technologies, Inc. * * Permission to use, copy, modify, distribute, and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appears in all copies and * that both that copyright notice and this permission notice appear in * supporting documentation, and that the name of OpenVision not be used * in advertising or publicity pertaining to distribution of the software * without specific, written prior permission. OpenVision makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ #include <linux/types.h> #include <linux/sunrpc/gss_krb5.h> #include <linux/crypto.h> #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_AUTH #endif static s32 krb5_make_rc4_seq_num(struct krb5_ctx *kctx, int direction, s32 seqnum, unsigned char *cksum, unsigned char *buf) { struct crypto_blkcipher *cipher; unsigned char plain[8]; s32 code; dprintk("RPC: %s:\n", __func__); cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(cipher)) return PTR_ERR(cipher); plain[0] = (unsigned char) ((seqnum >> 24) & 0xff); plain[1] = (unsigned char) ((seqnum >> 16) & 0xff); plain[2] = (unsigned char) ((seqnum >> 8) & 0xff); plain[3] = (unsigned char) ((seqnum >> 0) & 0xff); plain[4] = direction; plain[5] = direction; plain[6] = direction; plain[7] = direction; code = krb5_rc4_setup_seq_key(kctx, cipher, cksum); if (code) goto out; code = krb5_encrypt(cipher, cksum, plain, buf, 8); out: crypto_free_blkcipher(cipher); return code; } s32 krb5_make_seq_num(struct krb5_ctx *kctx, struct crypto_blkcipher *key, int direction, u32 seqnum, unsigned char *cksum, unsigned char *buf) { unsigned char plain[8]; if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) return krb5_make_rc4_seq_num(kctx, direction, seqnum, cksum, buf); plain[0] = (unsigned char) (seqnum & 0xff); plain[1] = (unsigned char) ((seqnum >> 8) & 0xff); plain[2] = (unsigned char) ((seqnum >> 16) & 0xff); plain[3] = (unsigned char) ((seqnum >> 24) & 0xff); plain[4] = direction; plain[5] = direction; plain[6] = direction; plain[7] = direction; return krb5_encrypt(key, cksum, plain, buf, 8); } static s32 krb5_get_rc4_seq_num(struct krb5_ctx *kctx, unsigned char *cksum, unsigned char *buf, int *direction, s32 *seqnum) { struct crypto_blkcipher *cipher; unsigned char plain[8]; s32 code; dprintk("RPC: %s:\n", __func__); cipher = crypto_alloc_blkcipher(kctx->gk5e->encrypt_name, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(cipher)) return PTR_ERR(cipher); code = krb5_rc4_setup_seq_key(kctx, cipher, cksum); if (code) goto out; code = krb5_decrypt(cipher, cksum, buf, plain, 8); if (code) goto out; if ((plain[4] != plain[5]) || (plain[4] != plain[6]) || (plain[4] != plain[7])) { code = (s32)KG_BAD_SEQ; goto out; } *direction = plain[4]; *seqnum = ((plain[0] << 24) | (plain[1] << 16) | (plain[2] << 8) | (plain[3])); out: crypto_free_blkcipher(cipher); return code; } s32 krb5_get_seq_num(struct krb5_ctx *kctx, unsigned char *cksum, unsigned char *buf, int *direction, u32 *seqnum) { s32 code; unsigned char plain[8]; struct crypto_blkcipher *key = kctx->seq; dprintk("RPC: krb5_get_seq_num:\n"); if (kctx->enctype == ENCTYPE_ARCFOUR_HMAC) return krb5_get_rc4_seq_num(kctx, cksum, buf, direction, seqnum); if ((code = krb5_decrypt(key, cksum, buf, plain, 8))) return code; if ((plain[4] != plain[5]) || (plain[4] != plain[6]) || (plain[4] != plain[7])) return (s32)KG_BAD_SEQ; *direction = plain[4]; *seqnum = ((plain[0]) | (plain[1] << 8) | (plain[2] << 16) | (plain[3] << 24)); return 0; }