232 lines
6.1 KiB
C
232 lines
6.1 KiB
C
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/*
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* linux/net/sunrpc/gss_generic_token.c
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*
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* Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/generic/util_token.c
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*
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* Copyright (c) 2000 The Regents of the University of Michigan.
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* All rights reserved.
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*
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* Andy Adamson <andros@umich.edu>
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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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#include <linux/types.h>
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#include <linux/module.h>
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#include <linux/string.h>
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#include <linux/sunrpc/sched.h>
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#include <linux/sunrpc/gss_asn1.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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/* TWRITE_STR from gssapiP_generic.h */
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#define TWRITE_STR(ptr, str, len) \
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memcpy((ptr), (char *) (str), (len)); \
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(ptr) += (len);
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/* XXXX this code currently makes the assumption that a mech oid will
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never be longer than 127 bytes. This assumption is not inherent in
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the interfaces, so the code can be fixed if the OSI namespace
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balloons unexpectedly. */
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/* Each token looks like this:
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0x60 tag for APPLICATION 0, SEQUENCE
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(constructed, definite-length)
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<length> possible multiple bytes, need to parse/generate
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0x06 tag for OBJECT IDENTIFIER
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<moid_length> compile-time constant string (assume 1 byte)
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<moid_bytes> compile-time constant string
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<inner_bytes> the ANY containing the application token
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bytes 0,1 are the token type
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bytes 2,n are the token data
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For the purposes of this abstraction, the token "header" consists of
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the sequence tag and length octets, the mech OID DER encoding, and the
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first two inner bytes, which indicate the token type. The token
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"body" consists of everything else.
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*/
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static int
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der_length_size( int length)
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{
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if (length < (1<<7))
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return 1;
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else if (length < (1<<8))
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return 2;
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#if (SIZEOF_INT == 2)
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else
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return 3;
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#else
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else if (length < (1<<16))
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return 3;
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else if (length < (1<<24))
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return 4;
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else
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return 5;
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#endif
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}
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static void
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der_write_length(unsigned char **buf, int length)
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{
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if (length < (1<<7)) {
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*(*buf)++ = (unsigned char) length;
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} else {
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*(*buf)++ = (unsigned char) (der_length_size(length)+127);
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#if (SIZEOF_INT > 2)
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if (length >= (1<<24))
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*(*buf)++ = (unsigned char) (length>>24);
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if (length >= (1<<16))
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*(*buf)++ = (unsigned char) ((length>>16)&0xff);
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#endif
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if (length >= (1<<8))
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*(*buf)++ = (unsigned char) ((length>>8)&0xff);
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*(*buf)++ = (unsigned char) (length&0xff);
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}
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}
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/* returns decoded length, or < 0 on failure. Advances buf and
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decrements bufsize */
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static int
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der_read_length(unsigned char **buf, int *bufsize)
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{
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unsigned char sf;
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int ret;
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if (*bufsize < 1)
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return -1;
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sf = *(*buf)++;
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(*bufsize)--;
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if (sf & 0x80) {
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if ((sf &= 0x7f) > ((*bufsize)-1))
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return -1;
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if (sf > SIZEOF_INT)
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return -1;
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ret = 0;
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for (; sf; sf--) {
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ret = (ret<<8) + (*(*buf)++);
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(*bufsize)--;
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}
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} else {
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ret = sf;
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}
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return ret;
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}
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/* returns the length of a token, given the mech oid and the body size */
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int
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g_token_size(struct xdr_netobj *mech, unsigned int body_size)
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{
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/* set body_size to sequence contents size */
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body_size += 2 + (int) mech->len; /* NEED overflow check */
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return 1 + der_length_size(body_size) + body_size;
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}
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EXPORT_SYMBOL_GPL(g_token_size);
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/* fills in a buffer with the token header. The buffer is assumed to
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be the right size. buf is advanced past the token header */
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void
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g_make_token_header(struct xdr_netobj *mech, int body_size, unsigned char **buf)
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{
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*(*buf)++ = 0x60;
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der_write_length(buf, 2 + mech->len + body_size);
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*(*buf)++ = 0x06;
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*(*buf)++ = (unsigned char) mech->len;
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TWRITE_STR(*buf, mech->data, ((int) mech->len));
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}
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EXPORT_SYMBOL_GPL(g_make_token_header);
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/*
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* Given a buffer containing a token, reads and verifies the token,
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* leaving buf advanced past the token header, and setting body_size
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* to the number of remaining bytes. Returns 0 on success,
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* G_BAD_TOK_HEADER for a variety of errors, and G_WRONG_MECH if the
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* mechanism in the token does not match the mech argument. buf and
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* *body_size are left unmodified on error.
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*/
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u32
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g_verify_token_header(struct xdr_netobj *mech, int *body_size,
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unsigned char **buf_in, int toksize)
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{
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unsigned char *buf = *buf_in;
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int seqsize;
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struct xdr_netobj toid;
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int ret = 0;
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if ((toksize-=1) < 0)
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return G_BAD_TOK_HEADER;
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if (*buf++ != 0x60)
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return G_BAD_TOK_HEADER;
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if ((seqsize = der_read_length(&buf, &toksize)) < 0)
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return G_BAD_TOK_HEADER;
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if (seqsize != toksize)
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return G_BAD_TOK_HEADER;
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if ((toksize-=1) < 0)
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return G_BAD_TOK_HEADER;
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if (*buf++ != 0x06)
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return G_BAD_TOK_HEADER;
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if ((toksize-=1) < 0)
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return G_BAD_TOK_HEADER;
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toid.len = *buf++;
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if ((toksize-=toid.len) < 0)
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return G_BAD_TOK_HEADER;
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toid.data = buf;
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buf+=toid.len;
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if (! g_OID_equal(&toid, mech))
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ret = G_WRONG_MECH;
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/* G_WRONG_MECH is not returned immediately because it's more important
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to return G_BAD_TOK_HEADER if the token header is in fact bad */
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if ((toksize-=2) < 0)
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return G_BAD_TOK_HEADER;
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if (ret)
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return ret;
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*buf_in = buf;
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*body_size = toksize;
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return ret;
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}
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EXPORT_SYMBOL_GPL(g_verify_token_header);
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