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222 lines
6.6 KiB
222 lines
6.6 KiB
/* |
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* linux/net/sunrpc/gss_krb5_seal.c |
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* |
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* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c |
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* |
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* Copyright (c) 2000-2008 The Regents of the University of Michigan. |
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* All rights reserved. |
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* |
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* Andy Adamson <[email protected]> |
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* J. Bruce Fields <[email protected]> |
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*/ |
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/* |
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* Copyright 1993 by OpenVision Technologies, Inc. |
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* |
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* Permission to use, copy, modify, distribute, and sell this software |
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* and its documentation for any purpose is hereby granted without fee, |
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* provided that the above copyright notice appears in all copies and |
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* that both that copyright notice and this permission notice appear in |
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* supporting documentation, and that the name of OpenVision not be used |
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* in advertising or publicity pertaining to distribution of the software |
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* without specific, written prior permission. OpenVision makes no |
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* representations about the suitability of this software for any |
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* purpose. It is provided "as is" without express or implied warranty. |
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* |
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* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
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* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF |
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* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR |
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
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* PERFORMANCE OF THIS SOFTWARE. |
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*/ |
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/* |
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* Copyright (C) 1998 by the FundsXpress, INC. |
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* |
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* All rights reserved. |
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* |
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* Export of this software from the United States of America may require |
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* a specific license from the United States Government. It is the |
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* responsibility of any person or organization contemplating export to |
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* obtain such a license before exporting. |
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* |
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* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and |
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* distribute this software and its documentation for any purpose and |
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* without fee is hereby granted, provided that the above copyright |
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* notice appear in all copies and that both that copyright notice and |
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* this permission notice appear in supporting documentation, and that |
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* the name of FundsXpress. not be used in advertising or publicity pertaining |
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* to distribution of the software without specific, written prior |
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* permission. FundsXpress makes no representations about the suitability of |
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* this software for any purpose. It is provided "as is" without express |
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* or implied warranty. |
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* |
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
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* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
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*/ |
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#include <linux/types.h> |
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#include <linux/jiffies.h> |
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#include <linux/sunrpc/gss_krb5.h> |
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#include <linux/random.h> |
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#include <linux/crypto.h> |
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#include <linux/atomic.h> |
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#if IS_ENABLED(CONFIG_SUNRPC_DEBUG) |
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# define RPCDBG_FACILITY RPCDBG_AUTH |
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#endif |
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static void * |
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setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token) |
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{ |
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u16 *ptr; |
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void *krb5_hdr; |
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int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength; |
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token->len = g_token_size(&ctx->mech_used, body_size); |
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ptr = (u16 *)token->data; |
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g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr); |
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/* ptr now at start of header described in rfc 1964, section 1.2.1: */ |
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krb5_hdr = ptr; |
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*ptr++ = KG_TOK_MIC_MSG; |
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/* |
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* signalg is stored as if it were converted from LE to host endian, even |
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* though it's an opaque pair of bytes according to the RFC. |
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*/ |
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*ptr++ = (__force u16)cpu_to_le16(ctx->gk5e->signalg); |
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*ptr++ = SEAL_ALG_NONE; |
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*ptr = 0xffff; |
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return krb5_hdr; |
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} |
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static void * |
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setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token) |
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{ |
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u16 *ptr; |
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void *krb5_hdr; |
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u8 *p, flags = 0x00; |
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if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0) |
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flags |= 0x01; |
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if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY) |
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flags |= 0x04; |
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/* Per rfc 4121, sec 4.2.6.1, there is no header, |
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* just start the token */ |
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krb5_hdr = ptr = (u16 *)token->data; |
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*ptr++ = KG2_TOK_MIC; |
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p = (u8 *)ptr; |
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*p++ = flags; |
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*p++ = 0xff; |
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ptr = (u16 *)p; |
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*ptr++ = 0xffff; |
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*ptr = 0xffff; |
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token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength; |
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return krb5_hdr; |
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} |
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static u32 |
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gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text, |
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struct xdr_netobj *token) |
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{ |
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char cksumdata[GSS_KRB5_MAX_CKSUM_LEN]; |
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struct xdr_netobj md5cksum = {.len = sizeof(cksumdata), |
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.data = cksumdata}; |
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void *ptr; |
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time64_t now; |
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u32 seq_send; |
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u8 *cksumkey; |
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dprintk("RPC: %s\n", __func__); |
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BUG_ON(ctx == NULL); |
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now = ktime_get_real_seconds(); |
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ptr = setup_token(ctx, token); |
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if (ctx->gk5e->keyed_cksum) |
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cksumkey = ctx->cksum; |
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else |
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cksumkey = NULL; |
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if (make_checksum(ctx, ptr, 8, text, 0, cksumkey, |
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KG_USAGE_SIGN, &md5cksum)) |
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return GSS_S_FAILURE; |
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memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len); |
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seq_send = atomic_fetch_inc(&ctx->seq_send); |
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if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff, |
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seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8)) |
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return GSS_S_FAILURE; |
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return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE; |
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} |
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static u32 |
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gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text, |
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struct xdr_netobj *token) |
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{ |
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char cksumdata[GSS_KRB5_MAX_CKSUM_LEN]; |
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struct xdr_netobj cksumobj = { .len = sizeof(cksumdata), |
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.data = cksumdata}; |
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void *krb5_hdr; |
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time64_t now; |
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u8 *cksumkey; |
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unsigned int cksum_usage; |
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__be64 seq_send_be64; |
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dprintk("RPC: %s\n", __func__); |
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krb5_hdr = setup_token_v2(ctx, token); |
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/* Set up the sequence number. Now 64-bits in clear |
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* text and w/o direction indicator */ |
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seq_send_be64 = cpu_to_be64(atomic64_fetch_inc(&ctx->seq_send64)); |
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memcpy(krb5_hdr + 8, (char *) &seq_send_be64, 8); |
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if (ctx->initiate) { |
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cksumkey = ctx->initiator_sign; |
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cksum_usage = KG_USAGE_INITIATOR_SIGN; |
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} else { |
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cksumkey = ctx->acceptor_sign; |
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cksum_usage = KG_USAGE_ACCEPTOR_SIGN; |
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} |
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if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN, |
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text, 0, cksumkey, cksum_usage, &cksumobj)) |
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return GSS_S_FAILURE; |
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memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len); |
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now = ktime_get_real_seconds(); |
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return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE; |
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} |
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u32 |
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gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, |
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struct xdr_netobj *token) |
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{ |
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struct krb5_ctx *ctx = gss_ctx->internal_ctx_id; |
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switch (ctx->enctype) { |
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default: |
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BUG(); |
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case ENCTYPE_DES_CBC_RAW: |
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case ENCTYPE_DES3_CBC_RAW: |
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return gss_get_mic_v1(ctx, text, token); |
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case ENCTYPE_AES128_CTS_HMAC_SHA1_96: |
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case ENCTYPE_AES256_CTS_HMAC_SHA1_96: |
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return gss_get_mic_v2(ctx, text, token); |
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} |
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}
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