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 * Copyright (c) 2011, Whamcloud, Inc.
10 * Author: Eric Mei <ericm@clusterfs.com>
14 * linux/net/sunrpc/gss_generic_token.c
16 * Adapted from MIT Kerberos 5-1.2.1 lib/gssapi/generic/util_token.c
18 * Copyright (c) 2000 The Regents of the University of Michigan.
19 * All rights reserved.
21 * Andy Adamson <andros@umich.edu>
25 * Copyright 1993 by OpenVision Technologies, Inc.
27 * Permission to use, copy, modify, distribute, and sell this software
28 * and its documentation for any purpose is hereby granted without fee,
29 * provided that the above copyright notice appears in all copies and
30 * that both that copyright notice and this permission notice appear in
31 * supporting documentation, and that the name of OpenVision not be used
32 * in advertising or publicity pertaining to distribution of the software
33 * without specific, written prior permission. OpenVision makes no
34 * representations about the suitability of this software for any
35 * purpose. It is provided "as is" without express or implied warranty.
37 * OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
38 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
39 * EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
40 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
41 * USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
42 * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
43 * PERFORMANCE OF THIS SOFTWARE.
47 # define EXPORT_SYMTAB
49 #define DEBUG_SUBSYSTEM S_SEC
51 #include <linux/init.h>
52 #include <linux/module.h>
53 #include <linux/slab.h>
54 #include <linux/mutex.h>
56 #include <liblustre.h>
60 #include <obd_class.h>
61 #include <obd_support.h>
62 #include <lustre/lustre_idl.h>
63 #include <lustre_net.h>
64 #include <lustre_import.h>
65 #include <lustre_sec.h>
68 #include "gss_internal.h"
74 /* TWRITE_STR from gssapiP_generic.h */
75 #define TWRITE_STR(ptr, str, len) \
76 memcpy((ptr), (char *) (str), (len)); \
79 /* XXXX this code currently makes the assumption that a mech oid will
80 never be longer than 127 bytes. This assumption is not inherent in
81 the interfaces, so the code can be fixed if the OSI namespace
82 balloons unexpectedly. */
84 /* Each token looks like this:
86 0x60 tag for APPLICATION 0, SEQUENCE
87 (constructed, definite-length)
88 <length> possible multiple bytes, need to parse/generate
89 0x06 tag for OBJECT IDENTIFIER
90 <moid_length> compile-time constant string (assume 1 byte)
91 <moid_bytes> compile-time constant string
92 <inner_bytes> the ANY containing the application token
93 bytes 0,1 are the token type
94 bytes 2,n are the token data
96 For the purposes of this abstraction, the token "header" consists of
97 the sequence tag and length octets, the mech OID DER encoding, and the
98 first two inner bytes, which indicate the token type. The token
99 "body" consists of everything else.
104 int der_length_size(int length)
106 if (length < (1 << 7))
108 else if (length < (1 << 8))
110 #if (SIZEOF_INT == 2)
114 else if (length < (1 << 16))
116 else if (length < (1 << 24))
124 void der_write_length(unsigned char **buf, int length)
126 if (length < (1 << 7)) {
127 *(*buf)++ = (unsigned char) length;
129 *(*buf)++ = (unsigned char) (der_length_size(length) + 127);
131 if (length >= (1 << 24))
132 *(*buf)++ = (unsigned char) (length >> 24);
133 if (length >= (1 << 16))
134 *(*buf)++ = (unsigned char) ((length >> 16) & 0xff);
136 if (length >= (1 << 8))
137 *(*buf)++ = (unsigned char) ((length >> 8) & 0xff);
138 *(*buf)++ = (unsigned char) (length & 0xff);
143 * returns decoded length, or < 0 on failure. Advances buf and
147 int der_read_length(unsigned char **buf, int *bufsize)
157 if ((sf &= 0x7f) > ((*bufsize) - 1))
163 ret = (ret << 8) + (*(*buf)++);
174 * returns the length of a token, given the mech oid and the body size
176 int g_token_size(rawobj_t *mech, unsigned int body_size)
178 /* set body_size to sequence contents size */
179 body_size += 4 + (int) mech->len; /* NEED overflow check */
180 return (1 + der_length_size(body_size) + body_size);
184 * fills in a buffer with the token header. The buffer is assumed to
185 * be the right size. buf is advanced past the token header
187 void g_make_token_header(rawobj_t *mech, int body_size, unsigned char **buf)
190 der_write_length(buf, 4 + mech->len + body_size);
192 *(*buf)++ = (unsigned char) mech->len;
193 TWRITE_STR(*buf, mech->data, ((int) mech->len));
197 * Given a buffer containing a token, reads and verifies the token,
198 * leaving buf advanced past the token header, and setting body_size
199 * to the number of remaining bytes. Returns 0 on success,
200 * G_BAD_TOK_HEADER for a variety of errors, and G_WRONG_MECH if the
201 * mechanism in the token does not match the mech argument. buf and
202 * *body_size are left unmodified on error.
204 __u32 g_verify_token_header(rawobj_t *mech, int *body_size,
205 unsigned char **buf_in, int toksize)
207 unsigned char *buf = *buf_in;
212 if ((toksize -= 1) < 0)
213 return (G_BAD_TOK_HEADER);
215 return (G_BAD_TOK_HEADER);
217 if ((seqsize = der_read_length(&buf, &toksize)) < 0)
218 return(G_BAD_TOK_HEADER);
220 if (seqsize != toksize)
221 return (G_BAD_TOK_HEADER);
223 if ((toksize -= 1) < 0)
224 return (G_BAD_TOK_HEADER);
226 return (G_BAD_TOK_HEADER);
228 if ((toksize -= 1) < 0)
229 return (G_BAD_TOK_HEADER);
232 if ((toksize -= toid.len) < 0)
233 return (G_BAD_TOK_HEADER);
237 if (!g_OID_equal(&toid, mech))
240 /* G_WRONG_MECH is not returned immediately because it's more
241 * important to return G_BAD_TOK_HEADER if the token header is
244 if ((toksize -= 2) < 0)
245 return (G_BAD_TOK_HEADER);
252 *body_size = toksize;
259 * Given a buffer containing a token, returns a copy of the mech oid in
260 * the parameter mech.
262 __u32 g_get_mech_oid(rawobj_t *mech, rawobj_t *in_buf)
264 unsigned char *buf = in_buf->data;
265 int len = in_buf->len;
270 return (G_BAD_TOK_HEADER);
272 return (G_BAD_TOK_HEADER);
274 if ((seqsize = der_read_length(&buf, &len)) < 0)
275 return (G_BAD_TOK_HEADER);
278 return (G_BAD_TOK_HEADER);
280 return (G_BAD_TOK_HEADER);
283 return (G_BAD_TOK_HEADER);
286 if ((len -= mech->len) < 0)
287 return (G_BAD_TOK_HEADER);
288 OBD_ALLOC_LARGE(mech->data, mech->len);
290 return (G_BUFFER_ALLOC);
291 memcpy(mech->data, buf, mech->len);