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>
51 #include <linux/mutex.h>
53 #include <liblustre.h>
57 #include <obd_class.h>
58 #include <obd_support.h>
59 #include <lustre/lustre_idl.h>
60 #include <lustre_net.h>
61 #include <lustre_import.h>
62 #include <lustre_sec.h>
65 #include "gss_internal.h"
71 /* TWRITE_STR from gssapiP_generic.h */
72 #define TWRITE_STR(ptr, str, len) \
73 memcpy((ptr), (char *) (str), (len)); \
76 /* XXXX this code currently makes the assumption that a mech oid will
77 never be longer than 127 bytes. This assumption is not inherent in
78 the interfaces, so the code can be fixed if the OSI namespace
79 balloons unexpectedly. */
81 /* Each token looks like this:
83 0x60 tag for APPLICATION 0, SEQUENCE
84 (constructed, definite-length)
85 <length> possible multiple bytes, need to parse/generate
86 0x06 tag for OBJECT IDENTIFIER
87 <moid_length> compile-time constant string (assume 1 byte)
88 <moid_bytes> compile-time constant string
89 <inner_bytes> the ANY containing the application token
90 bytes 0,1 are the token type
91 bytes 2,n are the token data
93 For the purposes of this abstraction, the token "header" consists of
94 the sequence tag and length octets, the mech OID DER encoding, and the
95 first two inner bytes, which indicate the token type. The token
96 "body" consists of everything else.
101 int der_length_size(int length)
103 if (length < (1 << 7))
105 else if (length < (1 << 8))
107 #if (SIZEOF_INT == 2)
111 else if (length < (1 << 16))
113 else if (length < (1 << 24))
121 void der_write_length(unsigned char **buf, int length)
123 if (length < (1 << 7)) {
124 *(*buf)++ = (unsigned char) length;
126 *(*buf)++ = (unsigned char) (der_length_size(length) + 127);
128 if (length >= (1 << 24))
129 *(*buf)++ = (unsigned char) (length >> 24);
130 if (length >= (1 << 16))
131 *(*buf)++ = (unsigned char) ((length >> 16) & 0xff);
133 if (length >= (1 << 8))
134 *(*buf)++ = (unsigned char) ((length >> 8) & 0xff);
135 *(*buf)++ = (unsigned char) (length & 0xff);
140 * returns decoded length, or < 0 on failure. Advances buf and
144 int der_read_length(unsigned char **buf, int *bufsize)
154 if ((sf &= 0x7f) > ((*bufsize) - 1))
160 ret = (ret << 8) + (*(*buf)++);
171 * returns the length of a token, given the mech oid and the body size
173 int g_token_size(rawobj_t *mech, unsigned int body_size)
175 /* set body_size to sequence contents size */
176 body_size += 4 + (int) mech->len; /* NEED overflow check */
177 return (1 + der_length_size(body_size) + body_size);
181 * fills in a buffer with the token header. The buffer is assumed to
182 * be the right size. buf is advanced past the token header
184 void g_make_token_header(rawobj_t *mech, int body_size, unsigned char **buf)
187 der_write_length(buf, 4 + mech->len + body_size);
189 *(*buf)++ = (unsigned char) mech->len;
190 TWRITE_STR(*buf, mech->data, ((int) mech->len));
194 * Given a buffer containing a token, reads and verifies the token,
195 * leaving buf advanced past the token header, and setting body_size
196 * to the number of remaining bytes. Returns 0 on success,
197 * G_BAD_TOK_HEADER for a variety of errors, and G_WRONG_MECH if the
198 * mechanism in the token does not match the mech argument. buf and
199 * *body_size are left unmodified on error.
201 __u32 g_verify_token_header(rawobj_t *mech, int *body_size,
202 unsigned char **buf_in, int toksize)
204 unsigned char *buf = *buf_in;
209 if ((toksize -= 1) < 0)
210 return (G_BAD_TOK_HEADER);
212 return (G_BAD_TOK_HEADER);
214 if ((seqsize = der_read_length(&buf, &toksize)) < 0)
215 return(G_BAD_TOK_HEADER);
217 if (seqsize != toksize)
218 return (G_BAD_TOK_HEADER);
220 if ((toksize -= 1) < 0)
221 return (G_BAD_TOK_HEADER);
223 return (G_BAD_TOK_HEADER);
225 if ((toksize -= 1) < 0)
226 return (G_BAD_TOK_HEADER);
229 if ((toksize -= toid.len) < 0)
230 return (G_BAD_TOK_HEADER);
234 if (!g_OID_equal(&toid, mech))
237 /* G_WRONG_MECH is not returned immediately because it's more
238 * important to return G_BAD_TOK_HEADER if the token header is
241 if ((toksize -= 2) < 0)
242 return (G_BAD_TOK_HEADER);
249 *body_size = toksize;
256 * Given a buffer containing a token, returns a copy of the mech oid in
257 * the parameter mech.
259 __u32 g_get_mech_oid(rawobj_t *mech, rawobj_t *in_buf)
261 unsigned char *buf = in_buf->data;
262 int len = in_buf->len;
267 return (G_BAD_TOK_HEADER);
269 return (G_BAD_TOK_HEADER);
271 if ((seqsize = der_read_length(&buf, &len)) < 0)
272 return (G_BAD_TOK_HEADER);
275 return (G_BAD_TOK_HEADER);
277 return (G_BAD_TOK_HEADER);
280 return (G_BAD_TOK_HEADER);
283 if ((len -= mech->len) < 0)
284 return (G_BAD_TOK_HEADER);
285 OBD_ALLOC(mech->data, mech->len);
287 return (G_BUFFER_ALLOC);
288 memcpy(mech->data, buf, mech->len);