[PATCH 18/23] gss_krb5: Save the raw session key in the context

steved
2010-03-17T17:26:09Z

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>
---
include/linux/sunrpc/gss_krb5.h | 1 +
net/sunrpc/auth_gss/gss_krb5_mech.c | 27 +++++++++++++--------------
2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/include/linux/sunrpc/gss_krb5.h b/include/linux/sunrpc/gss_krb5.h
index b00725e..14c9b0c 100644
--- a/include/linux/sunrpc/gss_krb5.h
+++ b/include/linux/sunrpc/gss_krb5.h
@@ -101,6 +101,7 @@ struct krb5_ctx {
struct crypto_blkcipher *initiator_enc;
struct crypto_blkcipher *acceptor_enc_aux;
struct crypto_blkcipher *initiator_enc_aux;
+ u8 Ksess[GSS_KRB5_MAX_KEYLEN]; /* session key */
u8 cksum[GSS_KRB5_MAX_KEYLEN];
s32 endtime;
u32 seq_send;
diff --git a/net/sunrpc/auth_gss/gss_krb5_mech.c b/net/sunrpc/auth_gss/gss_krb5_mech.c
index fab8010..41549e5 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;
}
--
1.6.6.1