/* * linux/net/sunrpc/gss_krb5_seal.c * * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/krb5/k5seal.c * * Copyright (c) 2000-2008 The Regents of the University of Michigan. * All rights reserved. * * Andy Adamson * J. Bruce Fields */ /* * 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 #include #include #include #include #include #if IS_ENABLED(CONFIG_SUNRPC_DEBUG) # define RPCDBG_FACILITY RPCDBG_AUTH #endif static void * setup_token(struct krb5_ctx *ctx, struct xdr_netobj *token) { u16 *ptr; void *krb5_hdr; int body_size = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength; token->len = g_token_size(&ctx->mech_used, body_size); ptr = (u16 *)token->data; g_make_token_header(&ctx->mech_used, body_size, (unsigned char **)&ptr); /* ptr now at start of header described in rfc 1964, section 1.2.1: */ krb5_hdr = ptr; *ptr++ = KG_TOK_MIC_MSG; /* * signalg is stored as if it were converted from LE to host endian, even * though it's an opaque pair of bytes according to the RFC. */ *ptr++ = (__force u16)cpu_to_le16(ctx->gk5e->signalg); *ptr++ = SEAL_ALG_NONE; *ptr = 0xffff; return krb5_hdr; } static void * setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token) { u16 *ptr; void *krb5_hdr; u8 *p, flags = 0x00; if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0) flags |= 0x01; if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY) flags |= 0x04; /* Per rfc 4121, sec 4.2.6.1, there is no header, * just start the token */ krb5_hdr = ptr = (u16 *)token->data; *ptr++ = KG2_TOK_MIC; p = (u8 *)ptr; *p++ = flags; *p++ = 0xff; ptr = (u16 *)p; *ptr++ = 0xffff; *ptr = 0xffff; token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength; return krb5_hdr; } static u32 gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text, struct xdr_netobj *token) { char cksumdata[GSS_KRB5_MAX_CKSUM_LEN]; struct xdr_netobj md5cksum = {.len = sizeof(cksumdata), .data = cksumdata}; void *ptr; time64_t now; u32 seq_send; u8 *cksumkey; dprintk("RPC: %s\n", __func__); BUG_ON(ctx == NULL); now = ktime_get_real_seconds(); ptr = setup_token(ctx, token); if (ctx->gk5e->keyed_cksum) cksumkey = ctx->cksum; else cksumkey = NULL; if (make_checksum(ctx, ptr, 8, text, 0, cksumkey, KG_USAGE_SIGN, &md5cksum)) return GSS_S_FAILURE; memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len); seq_send = atomic_fetch_inc(&ctx->seq_send); if (krb5_make_seq_num(ctx, ctx->seq, ctx->initiate ? 0 : 0xff, seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8)) return GSS_S_FAILURE; return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE; } static u32 gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text, struct xdr_netobj *token) { char cksumdata[GSS_KRB5_MAX_CKSUM_LEN]; struct xdr_netobj cksumobj = { .len = sizeof(cksumdata), .data = cksumdata}; void *krb5_hdr; time64_t now; u8 *cksumkey; unsigned int cksum_usage; __be64 seq_send_be64; dprintk("RPC: %s\n", __func__); krb5_hdr = setup_token_v2(ctx, token); /* Set up the sequence number. Now 64-bits in clear * text and w/o direction indicator */ seq_send_be64 = cpu_to_be64(atomic64_fetch_inc(&ctx->seq_send64)); memcpy(krb5_hdr + 8, (char *) &seq_send_be64, 8); if (ctx->initiate) { cksumkey = ctx->initiator_sign; cksum_usage = KG_USAGE_INITIATOR_SIGN; } else { cksumkey = ctx->acceptor_sign; cksum_usage = KG_USAGE_ACCEPTOR_SIGN; } if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN, text, 0, cksumkey, cksum_usage, &cksumobj)) return GSS_S_FAILURE; memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len); now = ktime_get_real_seconds(); return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE; } u32 gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text, struct xdr_netobj *token) { struct krb5_ctx *ctx = gss_ctx->internal_ctx_id; switch (ctx->enctype) { default: BUG(); case ENCTYPE_DES_CBC_RAW: case ENCTYPE_DES3_CBC_RAW: case ENCTYPE_ARCFOUR_HMAC: return gss_get_mic_v1(ctx, text, token); case ENCTYPE_AES128_CTS_HMAC_SHA1_96: case ENCTYPE_AES256_CTS_HMAC_SHA1_96: return gss_get_mic_v2(ctx, text, token); } }