1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Modifications for Lustre
5 * Copyright 2004 - 2006, Cluster File Systems, Inc.
7 * Author: Eric Mei <ericm@clusterfs.com>
11 * linux/net/sunrpc/gss_generic_token.c
13 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/generic/util_token.c
15 * Copyright (c) 2000 The Regents of the University of Michigan.
16 * All rights reserved.
18 * Andy Adamson <andros@umich.edu>
22 * Copyright 1993 by OpenVision Technologies, Inc.
24 * Permission to use, copy, modify, distribute, and sell this software
25 * and its documentation for any purpose is hereby granted without fee,
26 * provided that the above copyright notice appears in all copies and
27 * that both that copyright notice and this permission notice appear in
28 * supporting documentation, and that the name of OpenVision not be used
29 * in advertising or publicity pertaining to distribution of the software
30 * without specific, written prior permission. OpenVision makes no
31 * representations about the suitability of this software for any
32 * purpose. It is provided "as is" without express or implied warranty.
34 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
35 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
36 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
37 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
38 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
39 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
40 * PERFORMANCE OF THIS SOFTWARE.
44 # define EXPORT_SYMTAB
46 #define DEBUG_SUBSYSTEM S_SEC
48 #include <linux/init.h>
49 #include <linux/module.h>
50 #include <linux/slab.h>
52 #include <liblustre.h>
56 #include <obd_class.h>
57 #include <obd_support.h>
58 #include <lustre/lustre_idl.h>
59 #include <lustre_net.h>
60 #include <lustre_import.h>
61 #include <lustre_sec.h>
64 #include "gss_internal.h"
70 /* TWRITE_STR from gssapiP_generic.h */
71 #define TWRITE_STR(ptr, str, len) \
72 memcpy((ptr), (char *) (str), (len)); \
75 /* XXXX this code currently makes the assumption that a mech oid will
76 never be longer than 127 bytes. This assumption is not inherent in
77 the interfaces, so the code can be fixed if the OSI namespace
78 balloons unexpectedly. */
80 /* Each token looks like this:
82 0x60 tag for APPLICATION 0, SEQUENCE
83 (constructed, definite-length)
84 <length> possible multiple bytes, need to parse/generate
85 0x06 tag for OBJECT IDENTIFIER
86 <moid_length> compile-time constant string (assume 1 byte)
87 <moid_bytes> compile-time constant string
88 <inner_bytes> the ANY containing the application token
89 bytes 0,1 are the token type
90 bytes 2,n are the token data
92 For the purposes of this abstraction, the token "header" consists of
93 the sequence tag and length octets, the mech OID DER encoding, and the
94 first two inner bytes, which indicate the token type. The token
95 "body" consists of everything else.
100 int der_length_size(int length)
102 if (length < (1 << 7))
104 else if (length < (1 << 8))
106 #if (SIZEOF_INT == 2)
110 else if (length < (1 << 16))
112 else if (length < (1 << 24))
120 void der_write_length(unsigned char **buf, int length)
122 if (length < (1 << 7)) {
123 *(*buf)++ = (unsigned char) length;
125 *(*buf)++ = (unsigned char) (der_length_size(length) + 127);
127 if (length >= (1 << 24))
128 *(*buf)++ = (unsigned char) (length >> 24);
129 if (length >= (1 << 16))
130 *(*buf)++ = (unsigned char) ((length >> 16) & 0xff);
132 if (length >= (1 << 8))
133 *(*buf)++ = (unsigned char) ((length >> 8) & 0xff);
134 *(*buf)++ = (unsigned char) (length & 0xff);
139 * returns decoded length, or < 0 on failure. Advances buf and
143 int der_read_length(unsigned char **buf, int *bufsize)
153 if ((sf &= 0x7f) > ((*bufsize) - 1))
159 ret = (ret << 8) + (*(*buf)++);
170 * returns the length of a token, given the mech oid and the body size
172 int g_token_size(rawobj_t *mech, unsigned int body_size)
174 /* set body_size to sequence contents size */
175 body_size += 4 + (int) mech->len; /* NEED overflow check */
176 return (1 + der_length_size(body_size) + body_size);
180 * fills in a buffer with the token header. The buffer is assumed to
181 * be the right size. buf is advanced past the token header
183 void g_make_token_header(rawobj_t *mech, int body_size, unsigned char **buf)
186 der_write_length(buf, 4 + mech->len + body_size);
188 *(*buf)++ = (unsigned char) mech->len;
189 TWRITE_STR(*buf, mech->data, ((int) mech->len));
193 * Given a buffer containing a token, reads and verifies the token,
194 * leaving buf advanced past the token header, and setting body_size
195 * to the number of remaining bytes. Returns 0 on success,
196 * G_BAD_TOK_HEADER for a variety of errors, and G_WRONG_MECH if the
197 * mechanism in the token does not match the mech argument. buf and
198 * *body_size are left unmodified on error.
200 __u32 g_verify_token_header(rawobj_t *mech, int *body_size,
201 unsigned char **buf_in, int toksize)
203 unsigned char *buf = *buf_in;
208 if ((toksize -= 1) < 0)
209 return (G_BAD_TOK_HEADER);
211 return (G_BAD_TOK_HEADER);
213 if ((seqsize = der_read_length(&buf, &toksize)) < 0)
214 return(G_BAD_TOK_HEADER);
216 if (seqsize != toksize)
217 return (G_BAD_TOK_HEADER);
219 if ((toksize -= 1) < 0)
220 return (G_BAD_TOK_HEADER);
222 return (G_BAD_TOK_HEADER);
224 if ((toksize -= 1) < 0)
225 return (G_BAD_TOK_HEADER);
228 if ((toksize -= toid.len) < 0)
229 return (G_BAD_TOK_HEADER);
233 if (!g_OID_equal(&toid, mech))
236 /* G_WRONG_MECH is not returned immediately because it's more
237 * important to return G_BAD_TOK_HEADER if the token header is
240 if ((toksize -= 2) < 0)
241 return (G_BAD_TOK_HEADER);
248 *body_size = toksize;
255 * Given a buffer containing a token, returns a copy of the mech oid in
256 * the parameter mech.
258 __u32 g_get_mech_oid(rawobj_t *mech, rawobj_t *in_buf)
260 unsigned char *buf = in_buf->data;
261 int len = in_buf->len;
266 return (G_BAD_TOK_HEADER);
268 return (G_BAD_TOK_HEADER);
270 if ((seqsize = der_read_length(&buf, &len)) < 0)
271 return (G_BAD_TOK_HEADER);
274 return (G_BAD_TOK_HEADER);
276 return (G_BAD_TOK_HEADER);
279 return (G_BAD_TOK_HEADER);
282 if ((len -= mech->len) < 0)
283 return (G_BAD_TOK_HEADER);
284 OBD_ALLOC(mech->data, mech->len);
286 return (G_BUFFER_ALLOC);
287 memcpy(mech->data, buf, mech->len);