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Diffstat (limited to 'net/sunrpc/auth_gss/gss_krb5_mech.c')
-rw-r--r--net/sunrpc/auth_gss/gss_krb5_mech.c275
1 files changed, 275 insertions, 0 deletions
diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c
new file mode 100644
index 00000000000..cf726510df8
--- /dev/null
+++ b/net/sunrpc/auth_gss/gss_krb5_mech.c
@@ -0,0 +1,275 @@
+/*
+ * 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;
+
+ if (kctx->seq)
+ crypto_free_tfm(kctx->seq);
+ if (kctx->enc)
+ crypto_free_tfm(kctx->enc);
+ if (kctx->mech_used.data)
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-04-26 02:56:06 +0000