2 * linux/net/sunrpc/gss_krb5_mech.c
4 * Copyright (c) 2001-2008 The Regents of the University of Michigan.
7 * Andy Adamson <andros@umich.edu>
8 * J. Bruce Fields <bfields@umich.edu>
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its
20 * contributors may be used to endorse or promote products derived
21 * from this software without specific prior written permission.
23 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 #include <linux/err.h>
38 #include <linux/module.h>
39 #include <linux/init.h>
40 #include <linux/types.h>
41 #include <linux/slab.h>
42 #include <linux/sunrpc/auth.h>
43 #include <linux/sunrpc/gss_krb5.h>
44 #include <linux/sunrpc/xdr.h>
45 #include <linux/crypto.h>
48 # define RPCDBG_FACILITY RPCDBG_AUTH
51 static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
53 * DES (All DES enctypes are mapped to the same gss functionality)
56 .etype = ENCTYPE_DES_CBC_RAW,
57 .ctype = CKSUMTYPE_RSA_MD5,
58 .name = "des-cbc-crc",
59 .encrypt_name = "cbc(des)",
61 .encrypt = krb5_encrypt,
62 .decrypt = krb5_decrypt,
64 .signalg = SGN_ALG_DES_MAC_MD5,
65 .sealalg = SEAL_ALG_DES,
74 static const int num_supported_enctypes =
75 ARRAY_SIZE(supported_gss_krb5_enctypes);
78 supported_gss_krb5_enctype(int etype)
81 for (i = 0; i < num_supported_enctypes; i++)
82 if (supported_gss_krb5_enctypes[i].etype == etype)
87 static const struct gss_krb5_enctype *
88 get_gss_krb5_enctype(int etype)
91 for (i = 0; i < num_supported_enctypes; i++)
92 if (supported_gss_krb5_enctypes[i].etype == etype)
93 return &supported_gss_krb5_enctypes[i];
98 simple_get_bytes(const void *p, const void *end, void *res, int len)
100 const void *q = (const void *)((const char *)p + len);
101 if (unlikely(q > end || q < p))
102 return ERR_PTR(-EFAULT);
108 simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res)
113 p = simple_get_bytes(p, end, &len, sizeof(len));
116 q = (const void *)((const char *)p + len);
117 if (unlikely(q > end || q < p))
118 return ERR_PTR(-EFAULT);
119 res->data = kmemdup(p, len, GFP_NOFS);
120 if (unlikely(res->data == NULL))
121 return ERR_PTR(-ENOMEM);
126 static inline const void *
127 get_key(const void *p, const void *end,
128 struct krb5_ctx *ctx, struct crypto_blkcipher **res)
130 struct xdr_netobj key;
133 p = simple_get_bytes(p, end, &alg, sizeof(alg));
138 case ENCTYPE_DES_CBC_CRC:
139 case ENCTYPE_DES_CBC_MD4:
140 case ENCTYPE_DES_CBC_MD5:
141 /* Map all these key types to ENCTYPE_DES_CBC_RAW */
142 alg = ENCTYPE_DES_CBC_RAW;
146 if (!supported_gss_krb5_enctype(alg)) {
147 printk(KERN_WARNING "gss_kerberos_mech: unsupported "
148 "encryption key algorithm %d\n", alg);
151 p = simple_get_netobj(p, end, &key);
155 *res = crypto_alloc_blkcipher(ctx->gk5e->encrypt_name, 0,
158 printk(KERN_WARNING "gss_kerberos_mech: unable to initialize "
159 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
161 goto out_err_free_key;
163 if (crypto_blkcipher_setkey(*res, key.data, key.len)) {
164 printk(KERN_WARNING "gss_kerberos_mech: error setting key for "
165 "crypto algorithm %s\n", ctx->gk5e->encrypt_name);
166 goto out_err_free_tfm;
173 crypto_free_blkcipher(*res);
176 p = ERR_PTR(-EINVAL);
182 gss_import_v1_context(const void *p, const void *end, struct krb5_ctx *ctx)
186 p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate));
190 /* Old format supports only DES! Any other enctype uses new format */
191 ctx->enctype = ENCTYPE_DES_CBC_RAW;
193 ctx->gk5e = get_gss_krb5_enctype(ctx->enctype);
194 if (ctx->gk5e == NULL)
197 /* The downcall format was designed before we completely understood
198 * the uses of the context fields; so it includes some stuff we
199 * just give some minimal sanity-checking, and some we ignore
200 * completely (like the next twenty bytes): */
201 if (unlikely(p + 20 > end || p + 20 < p))
204 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
207 if (tmp != SGN_ALG_DES_MAC_MD5) {
208 p = ERR_PTR(-ENOSYS);
211 p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
214 if (tmp != SEAL_ALG_DES) {
215 p = ERR_PTR(-ENOSYS);
218 p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime));
221 p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send));
224 p = simple_get_netobj(p, end, &ctx->mech_used);
227 p = get_key(p, end, ctx, &ctx->enc);
229 goto out_err_free_mech;
230 p = get_key(p, end, ctx, &ctx->seq);
232 goto out_err_free_key1;
234 p = ERR_PTR(-EFAULT);
235 goto out_err_free_key2;
241 crypto_free_blkcipher(ctx->seq);
243 crypto_free_blkcipher(ctx->enc);
245 kfree(ctx->mech_used.data);
251 gss_import_sec_context_kerberos(const void *p, size_t len,
252 struct gss_ctx *ctx_id)
254 const void *end = (const void *)((const char *)p + len);
255 struct krb5_ctx *ctx;
258 ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
263 ret = gss_import_v1_context(p, end, ctx);
268 ctx_id->internal_ctx_id = ctx;
272 dprintk("RPC: %s: returning %d\n", __func__, ret);
277 gss_delete_sec_context_kerberos(void *internal_ctx) {
278 struct krb5_ctx *kctx = internal_ctx;
280 crypto_free_blkcipher(kctx->seq);
281 crypto_free_blkcipher(kctx->enc);
282 kfree(kctx->mech_used.data);
286 static const struct gss_api_ops gss_kerberos_ops = {
287 .gss_import_sec_context = gss_import_sec_context_kerberos,
288 .gss_get_mic = gss_get_mic_kerberos,
289 .gss_verify_mic = gss_verify_mic_kerberos,
290 .gss_wrap = gss_wrap_kerberos,
291 .gss_unwrap = gss_unwrap_kerberos,
292 .gss_delete_sec_context = gss_delete_sec_context_kerberos,
295 static struct pf_desc gss_kerberos_pfs[] = {
297 .pseudoflavor = RPC_AUTH_GSS_KRB5,
298 .service = RPC_GSS_SVC_NONE,
302 .pseudoflavor = RPC_AUTH_GSS_KRB5I,
303 .service = RPC_GSS_SVC_INTEGRITY,
307 .pseudoflavor = RPC_AUTH_GSS_KRB5P,
308 .service = RPC_GSS_SVC_PRIVACY,
313 static struct gss_api_mech gss_kerberos_mech = {
315 .gm_owner = THIS_MODULE,
316 .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"},
317 .gm_ops = &gss_kerberos_ops,
318 .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs),
319 .gm_pfs = gss_kerberos_pfs,
322 static int __init init_kerberos_module(void)
326 status = gss_mech_register(&gss_kerberos_mech);
328 printk("Failed to register kerberos gss mechanism!\n");
332 static void __exit cleanup_kerberos_module(void)
334 gss_mech_unregister(&gss_kerberos_mech);
337 MODULE_LICENSE("GPL");
338 module_init(init_kerberos_module);
339 module_exit(cleanup_kerberos_module);