gss_krb5: Save the raw session key in the context

This is needed for deriving arcfour-hmac keys "on the fly"
using the sequence number or checksu

Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 13 insertions, 14 deletions

diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c
index 506a2e7d4fad..893fad71e306 100644
--- a/net/sunrpc/auth_gss/gss_krb5_mech.c
+++ b/net/sunrpc/auth_gss/gss_krb5_mech.c
@@ -344,7 +344,7 @@ set_cdata(u8 cdata[GSS_KRB5_K5CLENGTH], u32 usage, u8 seed)
 }
 
 static int
-context_derive_keys_des3(struct krb5_ctx *ctx, u8 *rawkey, u32 keylen)
+context_derive_keys_des3(struct krb5_ctx *ctx)
 {
         struct xdr_netobj c, keyin, keyout;
         u8 cdata[GSS_KRB5_K5CLENGTH];
@@ -353,18 +353,18 @@ context_derive_keys_des3(struct krb5_ctx *ctx, u8 *rawkey, u32 keylen)
         c.len = GSS_KRB5_K5CLENGTH;
         c.data = cdata;
 
-        keyin.data = rawkey;
-        keyin.len = keylen;
-        keyout.len = keylen;
+        keyin.data = ctx->Ksess;
+        keyin.len = ctx->gk5e->keylength;
+        keyout.len = ctx->gk5e->keylength;
 
         /* seq uses the raw key */
         ctx->seq = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
-                                           rawkey);
+                                           ctx->Ksess);
         if (ctx->seq == NULL)
                 goto out_err;
 
         ctx->enc = context_v2_alloc_cipher(ctx, ctx->gk5e->encrypt_name,
-                                           rawkey);
+                                           ctx->Ksess);
         if (ctx->enc == NULL)
                 goto out_free_seq;
 
@@ -389,7 +389,7 @@ out_err:
 }
 
 static int
-context_derive_keys_new(struct krb5_ctx *ctx, u8 *rawkey, u32 keylen)
+context_derive_keys_new(struct krb5_ctx *ctx)
 {
         struct xdr_netobj c, keyin, keyout;
         u8 cdata[GSS_KRB5_K5CLENGTH];
@@ -398,9 +398,9 @@ context_derive_keys_new(struct krb5_ctx *ctx, u8 *rawkey, u32 keylen)
         c.len = GSS_KRB5_K5CLENGTH;
         c.data = cdata;
 
-        keyin.data = rawkey;
-        keyin.len = keylen;
-        keyout.len = keylen;
+        keyin.data = ctx->Ksess;
+        keyin.len = ctx->gk5e->keylength;
+        keyout.len = ctx->gk5e->keylength;
 
         /* initiator seal encryption */
         set_cdata(cdata, KG_USAGE_INITIATOR_SEAL, KEY_USAGE_SEED_ENCRYPTION);
@@ -502,7 +502,6 @@ out_err:
 static int
 gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx)
 {
-        u8 rawkey[GSS_KRB5_MAX_KEYLEN];
         int keylen;
 
         p = simple_get_bytes(p, end, &ctx->flags, sizeof(ctx->flags));
@@ -538,7 +537,7 @@ gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx)
         }
         keylen = ctx->gk5e->keylength;
 
-        p = simple_get_bytes(p, end, rawkey, keylen);
+        p = simple_get_bytes(p, end, ctx->Ksess, keylen);
         if (IS_ERR(p))
                 goto out_err;
 
@@ -557,10 +556,10 @@ gss_import_v2_context(const void *p, const void *end, struct krb5_ctx *ctx)
 
         switch (ctx->enctype) {
         case ENCTYPE_DES3_CBC_RAW:
-                return context_derive_keys_des3(ctx, rawkey, keylen);
+                return context_derive_keys_des3(ctx);
         case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
         case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
-                return context_derive_keys_new(ctx, rawkey, keylen);
+                return context_derive_keys_new(ctx);
         default:
                 return -EINVAL;
         }