diff options
Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_seal.c')
| -rw-r--r-- | net/sunrpc/auth_gss/gss_krb5_seal.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c new file mode 100644 index 000000000000..afeeb8715a77 --- /dev/null +++ b/net/sunrpc/auth_gss/gss_krb5_seal.c @@ -0,0 +1,176 @@ +/* + * linux/net/sunrpc/gss_krb5_seal.c + * + * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c + * + * Copyright (c) 2000 The Regents of the University of Michigan. + * All rights reserved. + * + * Andy Adamson <andros@umich.edu> + * J. Bruce Fields <bfields@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. + */ + +/* + * Copyright (C) 1998 by the FundsXpress, INC. + * + * All rights reserved. + * + * Export of this software from the United States of America may require + * a specific license from the United States Government. It is the + * responsibility of any person or organization contemplating export to + * obtain such a license before exporting. + * + * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and + * distribute this software and its documentation for any purpose and + * without fee is hereby granted, provided that the above copyright + * notice appear in all copies and that both that copyright notice and + * this permission notice appear in supporting documentation, and that + * the name of FundsXpress. not be used in advertising or publicity pertaining + * to distribution of the software without specific, written prior + * permission. FundsXpress makes no representations about the suitability of + * this software for any purpose. It is provided "as is" without express + * or implied warranty. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED + * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#include <linux/types.h> +#include <linux/slab.h> +#include <linux/jiffies.h> +#include <linux/sunrpc/gss_krb5.h> +#include <linux/random.h> +#include <asm/scatterlist.h> +#include <linux/crypto.h> + +#ifdef RPC_DEBUG +# define RPCDBG_FACILITY RPCDBG_AUTH +#endif + +static inline int +gss_krb5_padding(int blocksize, int length) { + /* Most of the code is block-size independent but in practice we + * use only 8: */ + BUG_ON(blocksize != 8); + return 8 - (length & 7); +} + +u32 +krb5_make_token(struct krb5_ctx *ctx, int qop_req, + struct xdr_buf *text, struct xdr_netobj *token, + int toktype) +{ + s32 checksum_type; + struct xdr_netobj md5cksum = {.len = 0, .data = NULL}; + int blocksize = 0, tmsglen; + unsigned char *ptr, *krb5_hdr, *msg_start; + s32 now; + + dprintk("RPC: gss_krb5_seal\n"); + + now = get_seconds(); + + if (qop_req != 0) + goto out_err; + + switch (ctx->signalg) { + case SGN_ALG_DES_MAC_MD5: + checksum_type = CKSUMTYPE_RSA_MD5; + break; + default: + dprintk("RPC: gss_krb5_seal: ctx->signalg %d not" + " supported\n", ctx->signalg); + goto out_err; + } + if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) { + dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n", + ctx->sealalg); + goto out_err; + } + + if (toktype == KG_TOK_WRAP_MSG) { + blocksize = crypto_tfm_alg_blocksize(ctx->enc); + tmsglen = blocksize + text->len + + gss_krb5_padding(blocksize, blocksize + text->len); + } else { + tmsglen = 0; + } + + token->len = g_token_size(&ctx->mech_used, 22 + tmsglen); + + ptr = token->data; + g_make_token_header(&ctx->mech_used, 22 + tmsglen, &ptr); + + *ptr++ = (unsigned char) ((toktype>>8)&0xff); + *ptr++ = (unsigned char) (toktype&0xff); + + /* ptr now at byte 2 of header described in rfc 1964, section 1.2.1: */ + krb5_hdr = ptr - 2; + msg_start = krb5_hdr + 24; + + *(u16 *)(krb5_hdr + 2) = htons(ctx->signalg); + memset(krb5_hdr + 4, 0xff, 4); + if (toktype == KG_TOK_WRAP_MSG) + *(u16 *)(krb5_hdr + 4) = htons(ctx->sealalg); + + if (toktype == KG_TOK_WRAP_MSG) { + /* XXX removing support for now */ + goto out_err; + } else { /* Sign only. */ + if (make_checksum(checksum_type, krb5_hdr, 8, text, + &md5cksum)) + goto out_err; + } + + switch (ctx->signalg) { + case SGN_ALG_DES_MAC_MD5: + if (krb5_encrypt(ctx->seq, NULL, md5cksum.data, + md5cksum.data, md5cksum.len)) + goto out_err; + memcpy(krb5_hdr + 16, + md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH, + KRB5_CKSUM_LENGTH); + + dprintk("RPC: make_seal_token: cksum data: \n"); + print_hexl((u32 *) (krb5_hdr + 16), KRB5_CKSUM_LENGTH, 0); + break; + default: + BUG(); + } + + kfree(md5cksum.data); + + if ((krb5_make_seq_num(ctx->seq, ctx->initiate ? 0 : 0xff, + ctx->seq_send, krb5_hdr + 16, krb5_hdr + 8))) + goto out_err; + + ctx->seq_send++; + + return ((ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE); +out_err: + if (md5cksum.data) kfree(md5cksum.data); + return GSS_S_FAILURE; +} |