| /* |
| * 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/module.h> |
| #include <linux/init.h> |
| #include <linux/types.h> |
| #include <linux/slab.h> |
| #include <linux/sunrpc/auth.h> |
| #include <linux/in.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 = kmalloc(len, GFP_KERNEL); |
| if (unlikely(res->data == NULL)) |
| return ERR_PTR(-ENOMEM); |
| memcpy(res->data, p, len); |
| res->len = len; |
| return q; |
| } |
| |
| static inline const void * |
| get_key(const void *p, const void *end, struct crypto_tfm **res) |
| { |
| struct xdr_netobj key; |
| int alg, alg_mode; |
| 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 = "des"; |
| alg_mode = CRYPTO_TFM_MODE_CBC; |
| break; |
| default: |
| dprintk("RPC: get_key: unsupported algorithm %d\n", alg); |
| goto out_err_free_key; |
| } |
| if (!(*res = crypto_alloc_tfm(alg_name, alg_mode))) |
| goto out_err_free_key; |
| if (crypto_cipher_setkey(*res, key.data, key.len)) |
| goto out_err_free_tfm; |
| |
| kfree(key.data); |
| return p; |
| |
| out_err_free_tfm: |
| crypto_free_tfm(*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; |
| |
| if (!(ctx = kmalloc(sizeof(*ctx), GFP_KERNEL))) |
| goto out_err; |
| memset(ctx, 0, sizeof(*ctx)); |
| |
| p = simple_get_bytes(p, end, &ctx->initiate, sizeof(ctx->initiate)); |
| if (IS_ERR(p)) |
| goto out_err_free_ctx; |
| p = simple_get_bytes(p, end, &ctx->seed_init, sizeof(ctx->seed_init)); |
| if (IS_ERR(p)) |
| goto out_err_free_ctx; |
| p = simple_get_bytes(p, end, ctx->seed, sizeof(ctx->seed)); |
| if (IS_ERR(p)) |
| goto out_err_free_ctx; |
| p = simple_get_bytes(p, end, &ctx->signalg, sizeof(ctx->signalg)); |
| if (IS_ERR(p)) |
| goto out_err_free_ctx; |
| p = simple_get_bytes(p, end, &ctx->sealalg, sizeof(ctx->sealalg)); |
| if (IS_ERR(p)) |
| 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: Succesfully imported new context.\n"); |
| return 0; |
| |
| out_err_free_key2: |
| crypto_free_tfm(ctx->seq); |
| out_err_free_key1: |
| crypto_free_tfm(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_tfm(kctx->seq); |
| crypto_free_tfm(kctx->enc); |
| kfree(kctx->mech_used.data); |
| kfree(kctx); |
| } |
| |
| static u32 |
| gss_verify_mic_kerberos(struct gss_ctx *ctx, |
| struct xdr_buf *message, |
| struct xdr_netobj *mic_token, |
| u32 *qstate) { |
| u32 maj_stat = 0; |
| int qop_state; |
| struct krb5_ctx *kctx = ctx->internal_ctx_id; |
| |
| maj_stat = krb5_read_token(kctx, mic_token, message, &qop_state, |
| KG_TOK_MIC_MSG); |
| if (!maj_stat && qop_state) |
| *qstate = qop_state; |
| |
| dprintk("RPC: gss_verify_mic_kerberos returning %d\n", maj_stat); |
| return maj_stat; |
| } |
| |
| static u32 |
| gss_get_mic_kerberos(struct gss_ctx *ctx, |
| u32 qop, |
| struct xdr_buf *message, |
| struct xdr_netobj *mic_token) { |
| u32 err = 0; |
| struct krb5_ctx *kctx = ctx->internal_ctx_id; |
| |
| err = krb5_make_token(kctx, qop, message, mic_token, KG_TOK_MIC_MSG); |
| |
| dprintk("RPC: gss_get_mic_kerberos returning %d\n",err); |
| |
| return err; |
| } |
| |
| static 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_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", |
| }, |
| }; |
| |
| static struct gss_api_mech gss_kerberos_mech = { |
| .gm_name = "krb5", |
| .gm_owner = THIS_MODULE, |
| .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); |