1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Modifications for Lustre
6 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
8 * Author: Eric Mei <ericm@clusterfs.com>
12 * linux/net/sunrpc/gss_generic_token.c
14 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/generic/util_token.c
16 * Copyright (c) 2000 The Regents of the University of Michigan.
17 * All rights reserved.
19 * Andy Adamson <andros@umich.edu>
23 * Copyright 1993 by OpenVision Technologies, Inc.
25 * Permission to use, copy, modify, distribute, and sell this software
26 * and its documentation for any purpose is hereby granted without fee,
27 * provided that the above copyright notice appears in all copies and
28 * that both that copyright notice and this permission notice appear in
29 * supporting documentation, and that the name of OpenVision not be used
30 * in advertising or publicity pertaining to distribution of the software
31 * without specific, written prior permission. OpenVision makes no
32 * representations about the suitability of this software for any
33 * purpose. It is provided "as is" without express or implied warranty.
35 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
36 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
37 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
38 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
39 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
40 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
41 * PERFORMANCE OF THIS SOFTWARE.
45 # define EXPORT_SYMTAB
47 #define DEBUG_SUBSYSTEM S_SEC
49 #include <linux/init.h>
50 #include <linux/module.h>
51 #include <linux/slab.h>
52 #include <linux/mutex.h>
54 #include <liblustre.h>
58 #include <obd_class.h>
59 #include <obd_support.h>
60 #include <lustre/lustre_idl.h>
61 #include <lustre_net.h>
62 #include <lustre_import.h>
63 #include <lustre_sec.h>
66 #include "gss_internal.h"
72 /* TWRITE_STR from gssapiP_generic.h */
73 #define TWRITE_STR(ptr, str, len) \
74 memcpy((ptr), (char *) (str), (len)); \
77 /* XXXX this code currently makes the assumption that a mech oid will
78 never be longer than 127 bytes. This assumption is not inherent in
79 the interfaces, so the code can be fixed if the OSI namespace
80 balloons unexpectedly. */
82 /* Each token looks like this:
84 0x60 tag for APPLICATION 0, SEQUENCE
85 (constructed, definite-length)
86 <length> possible multiple bytes, need to parse/generate
87 0x06 tag for OBJECT IDENTIFIER
88 <moid_length> compile-time constant string (assume 1 byte)
89 <moid_bytes> compile-time constant string
90 <inner_bytes> the ANY containing the application token
91 bytes 0,1 are the token type
92 bytes 2,n are the token data
94 For the purposes of this abstraction, the token "header" consists of
95 the sequence tag and length octets, the mech OID DER encoding, and the
96 first two inner bytes, which indicate the token type. The token
97 "body" consists of everything else.
102 int der_length_size(int length)
104 if (length < (1 << 7))
106 else if (length < (1 << 8))
108 #if (SIZEOF_INT == 2)
112 else if (length < (1 << 16))
114 else if (length < (1 << 24))
122 void der_write_length(unsigned char **buf, int length)
124 if (length < (1 << 7)) {
125 *(*buf)++ = (unsigned char) length;
127 *(*buf)++ = (unsigned char) (der_length_size(length) + 127);
129 if (length >= (1 << 24))
130 *(*buf)++ = (unsigned char) (length >> 24);
131 if (length >= (1 << 16))
132 *(*buf)++ = (unsigned char) ((length >> 16) & 0xff);
134 if (length >= (1 << 8))
135 *(*buf)++ = (unsigned char) ((length >> 8) & 0xff);
136 *(*buf)++ = (unsigned char) (length & 0xff);
141 * returns decoded length, or < 0 on failure. Advances buf and
145 int der_read_length(unsigned char **buf, int *bufsize)
155 if ((sf &= 0x7f) > ((*bufsize) - 1))
161 ret = (ret << 8) + (*(*buf)++);
172 * returns the length of a token, given the mech oid and the body size
174 int g_token_size(rawobj_t *mech, unsigned int body_size)
176 /* set body_size to sequence contents size */
177 body_size += 4 + (int) mech->len; /* NEED overflow check */
178 return (1 + der_length_size(body_size) + body_size);
182 * fills in a buffer with the token header. The buffer is assumed to
183 * be the right size. buf is advanced past the token header
185 void g_make_token_header(rawobj_t *mech, int body_size, unsigned char **buf)
188 der_write_length(buf, 4 + mech->len + body_size);
190 *(*buf)++ = (unsigned char) mech->len;
191 TWRITE_STR(*buf, mech->data, ((int) mech->len));
195 * Given a buffer containing a token, reads and verifies the token,
196 * leaving buf advanced past the token header, and setting body_size
197 * to the number of remaining bytes. Returns 0 on success,
198 * G_BAD_TOK_HEADER for a variety of errors, and G_WRONG_MECH if the
199 * mechanism in the token does not match the mech argument. buf and
200 * *body_size are left unmodified on error.
202 __u32 g_verify_token_header(rawobj_t *mech, int *body_size,
203 unsigned char **buf_in, int toksize)
205 unsigned char *buf = *buf_in;
210 if ((toksize -= 1) < 0)
211 return (G_BAD_TOK_HEADER);
213 return (G_BAD_TOK_HEADER);
215 if ((seqsize = der_read_length(&buf, &toksize)) < 0)
216 return(G_BAD_TOK_HEADER);
218 if (seqsize != toksize)
219 return (G_BAD_TOK_HEADER);
221 if ((toksize -= 1) < 0)
222 return (G_BAD_TOK_HEADER);
224 return (G_BAD_TOK_HEADER);
226 if ((toksize -= 1) < 0)
227 return (G_BAD_TOK_HEADER);
230 if ((toksize -= toid.len) < 0)
231 return (G_BAD_TOK_HEADER);
235 if (!g_OID_equal(&toid, mech))
238 /* G_WRONG_MECH is not returned immediately because it's more
239 * important to return G_BAD_TOK_HEADER if the token header is
242 if ((toksize -= 2) < 0)
243 return (G_BAD_TOK_HEADER);
250 *body_size = toksize;
257 * Given a buffer containing a token, returns a copy of the mech oid in
258 * the parameter mech.
260 __u32 g_get_mech_oid(rawobj_t *mech, rawobj_t *in_buf)
262 unsigned char *buf = in_buf->data;
263 int len = in_buf->len;
268 return (G_BAD_TOK_HEADER);
270 return (G_BAD_TOK_HEADER);
272 if ((seqsize = der_read_length(&buf, &len)) < 0)
273 return (G_BAD_TOK_HEADER);
276 return (G_BAD_TOK_HEADER);
278 return (G_BAD_TOK_HEADER);
281 return (G_BAD_TOK_HEADER);
284 if ((len -= mech->len) < 0)
285 return (G_BAD_TOK_HEADER);
286 OBD_ALLOC(mech->data, mech->len);
288 return (G_BUFFER_ALLOC);
289 memcpy(mech->data, buf, mech->len);