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[/] [or1k_soc_on_altera_embedded_dev_kit/] [tags/] [linux-2.6/] [linux-2.6.24_or32_unified_v2.3/] [net/] [sunrpc/] [auth_gss/] [gss_krb5_mech.c] - Rev 8
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/* * linux/net/sunrpc/gss_krb5_mech.c * * Copyright (c) 2001 The Regents of the University of Michigan. * All rights reserved. * * Andy Adamson <andros@umich.edu> * J. Bruce Fields <bfields@umich.edu> * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #include <linux/err.h> #include <linux/module.h> #include <linux/init.h> #include <linux/types.h> #include <linux/slab.h> #include <linux/sunrpc/auth.h> #include <linux/sunrpc/gss_krb5.h> #include <linux/sunrpc/xdr.h> #include <linux/crypto.h> #ifdef RPC_DEBUG # define RPCDBG_FACILITY RPCDBG_AUTH #endif static const void * simple_get_bytes(const void *p, const void *end, void *res, int len) { const void *q = (const void *)((const char *)p + len); if (unlikely(q > end || q < p)) return ERR_PTR(-EFAULT); memcpy(res, p, len); return q; } static const void * simple_get_netobj(const void *p, const void *end, struct xdr_netobj *res) { const void *q; unsigned int len; p = simple_get_bytes(p, end, &len, sizeof(len)); if (IS_ERR(p)) return p; q = (const void *)((const char *)p + len); if (unlikely(q > end || q < p)) return ERR_PTR(-EFAULT); res->data = kmemdup(p, len, GFP_KERNEL); if (unlikely(res->data == NULL)) return ERR_PTR(-ENOMEM); res->len = len; return q; } static inline const void * get_key(const void *p, const void *end, struct crypto_blkcipher **res) { struct xdr_netobj key; int alg; char *alg_name; p = simple_get_bytes(p, end, &alg, sizeof(alg)); if (IS_ERR(p)) goto out_err; p = simple_get_netobj(p, end, &key); if (IS_ERR(p)) goto out_err; switch (alg) { case ENCTYPE_DES_CBC_RAW: alg_name = "cbc(des)"; break; default: printk("gss_kerberos_mech: unsupported algorithm %d\n", alg); goto out_err_free_key; } *res = crypto_alloc_blkcipher(alg_name, 0, CRYPTO_ALG_ASYNC); if (IS_ERR(*res)) { printk("gss_kerberos_mech: unable to initialize crypto algorithm %s\n", alg_name); *res = NULL; goto out_err_free_key; } if (crypto_blkcipher_setkey(*res, key.data, key.len)) { printk("gss_kerberos_mech: error setting key for crypto algorithm %s\n", alg_name); goto out_err_free_tfm; } kfree(key.data); return p; out_err_free_tfm: crypto_free_blkcipher(*res); out_err_free_key: kfree(key.data); p = ERR_PTR(-EINVAL); out_err: return p; } static int gss_import_sec_context_kerberos(const void *p, size_t len, struct gss_ctx *ctx_id) { const void *end = (const void *)((const char *)p + len); struct krb5_ctx *ctx; int tmp; if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL))) goto out_err; p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate)); if (IS_ERR(p)) goto out_err_free_ctx; /* The downcall format was designed before we completely understood * the uses of the context fields; so it includes some stuff we * just give some minimal sanity-checking, and some we ignore * completely (like the next twenty bytes): */ if (unlikely(p + 20 > end || p + 20 < p)) goto out_err_free_ctx; p += 20; p = simple_get_bytes(p, end, &tmp, sizeof(tmp)); if (IS_ERR(p)) goto out_err_free_ctx; if (tmp != SGN_ALG_DES_MAC_MD5) { p = ERR_PTR(-ENOSYS); goto out_err_free_ctx; } p = simple_get_bytes(p, end, &tmp, sizeof(tmp)); if (IS_ERR(p)) goto out_err_free_ctx; if (tmp != SEAL_ALG_DES) { p = ERR_PTR(-ENOSYS); goto out_err_free_ctx; } p = simple_get_bytes(p, end, &ctx->endtime, sizeof(ctx->endtime)); if (IS_ERR(p)) goto out_err_free_ctx; p = simple_get_bytes(p, end, &ctx->seq_send, sizeof(ctx->seq_send)); if (IS_ERR(p)) goto out_err_free_ctx; p = simple_get_netobj(p, end, &ctx->mech_used); if (IS_ERR(p)) goto out_err_free_ctx; p = get_key(p, end, &ctx->enc); if (IS_ERR(p)) goto out_err_free_mech; p = get_key(p, end, &ctx->seq); if (IS_ERR(p)) goto out_err_free_key1; if (p != end) { p = ERR_PTR(-EFAULT); goto out_err_free_key2; } ctx_id->internal_ctx_id = ctx; dprintk("RPC: Successfully imported new context.\n"); return 0; out_err_free_key2: crypto_free_blkcipher(ctx->seq); out_err_free_key1: crypto_free_blkcipher(ctx->enc); out_err_free_mech: kfree(ctx->mech_used.data); out_err_free_ctx: kfree(ctx); out_err: return PTR_ERR(p); } static void gss_delete_sec_context_kerberos(void *internal_ctx) { struct krb5_ctx *kctx = internal_ctx; crypto_free_blkcipher(kctx->seq); crypto_free_blkcipher(kctx->enc); kfree(kctx->mech_used.data); kfree(kctx); } static const struct gss_api_ops gss_kerberos_ops = { .gss_import_sec_context = gss_import_sec_context_kerberos, .gss_get_mic = gss_get_mic_kerberos, .gss_verify_mic = gss_verify_mic_kerberos, .gss_wrap = gss_wrap_kerberos, .gss_unwrap = gss_unwrap_kerberos, .gss_delete_sec_context = gss_delete_sec_context_kerberos, }; static struct pf_desc gss_kerberos_pfs[] = { [0] = { .pseudoflavor = RPC_AUTH_GSS_KRB5, .service = RPC_GSS_SVC_NONE, .name = "krb5", }, [1] = { .pseudoflavor = RPC_AUTH_GSS_KRB5I, .service = RPC_GSS_SVC_INTEGRITY, .name = "krb5i", }, [2] = { .pseudoflavor = RPC_AUTH_GSS_KRB5P, .service = RPC_GSS_SVC_PRIVACY, .name = "krb5p", }, }; static struct gss_api_mech gss_kerberos_mech = { .gm_name = "krb5", .gm_owner = THIS_MODULE, .gm_oid = {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"}, .gm_ops = &gss_kerberos_ops, .gm_pf_num = ARRAY_SIZE(gss_kerberos_pfs), .gm_pfs = gss_kerberos_pfs, }; static int __init init_kerberos_module(void) { int status; status = gss_mech_register(&gss_kerberos_mech); if (status) printk("Failed to register kerberos gss mechanism!\n"); return status; } static void __exit cleanup_kerberos_module(void) { gss_mech_unregister(&gss_kerberos_mech); } MODULE_LICENSE("GPL"); module_init(init_kerberos_module); module_exit(cleanup_kerberos_module);