[PATCH 17/23] gssd_krb5: arcfour-hmac support

steved
2010-03-17T17:26:10Z

For arcfour-hmac support, the make_checksum function needs a usage
field to correctly calculate the checksum differently for MIC and
WRAP tokens.

Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
Signed-off-by: Steve Dickson <steved@redhat.com>
---
include/linux/sunrpc/gss_krb5.h | 4 ++--
net/sunrpc/auth_gss/gss_krb5_crypto.c | 15 +++++++++++----
net/sunrpc/auth_gss/gss_krb5_seal.c | 13 +++++++++----
net/sunrpc/auth_gss/gss_krb5_unseal.c | 12 ++++++++----
net/sunrpc/auth_gss/gss_krb5_wrap.c | 4 ++--
5 files changed, 32 insertions(+), 16 deletions(-)

diff --git a/include/linux/sunrpc/gss_krb5.h b/include/linux/sunrpc/gss_krb5.h
index 38f3def..b00725e 100644
--- a/include/linux/sunrpc/gss_krb5.h
+++ b/include/linux/sunrpc/gss_krb5.h
@@ -235,12 +235,12 @@ enum seal_alg {
u32
make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
struct xdr_buf *body, int body_offset, u8 *cksumkey,
- struct xdr_netobj *cksumout);
+ unsigned int usage, struct xdr_netobj *cksumout);

u32
make_checksum_v2(struct krb5_ctx *, char *header, int hdrlen,
struct xdr_buf *body, int body_offset, u8 *key,
- struct xdr_netobj *cksum);
+ unsigned int usage, struct xdr_netobj *cksum);

u32 gss_get_mic_kerberos(struct gss_ctx *, struct xdr_buf *,
struct xdr_netobj *);
diff --git a/net/sunrpc/auth_gss/gss_krb5_crypto.c b/net/sunrpc/auth_gss/gss_krb5_crypto.c
index 099559c..5ace3cd 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -133,7 +133,7 @@ checksummer(struct scatterlist *sg, void *data)
u32
make_checksum(struct krb5_ctx *kctx, char *header, int hdrlen,
struct xdr_buf *body, int body_offset, u8 *cksumkey,
- struct xdr_netobj *cksumout)
+ unsigned int usage, struct xdr_netobj *cksumout)
{
struct hash_desc desc;
struct scatterlist sg[1];
@@ -209,7 +209,7 @@ out:
u32
make_checksum_v2(struct krb5_ctx *kctx, char *header, int hdrlen,
struct xdr_buf *body, int body_offset, u8 *cksumkey,
- struct xdr_netobj *cksumout)
+ unsigned int usage, struct xdr_netobj *cksumout)
{
struct hash_desc desc;
struct scatterlist sg[1];
@@ -538,15 +538,18 @@ gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
int nblocks, nbytes;
struct encryptor_desc desc;
u32 cbcbytes;
+ unsigned int usage;

if (kctx->initiate) {
cipher = kctx->initiator_enc;
aux_cipher = kctx->initiator_enc_aux;
cksumkey = kctx->initiator_integ;
+ usage = KG_USAGE_INITIATOR_SEAL;
} else {
cipher = kctx->acceptor_enc;
aux_cipher = kctx->acceptor_enc_aux;
cksumkey = kctx->acceptor_integ;
+ usage = KG_USAGE_ACCEPTOR_SEAL;
}
blocksize = crypto_blkcipher_blocksize(cipher);

@@ -591,7 +594,8 @@ gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
buf->pages = pages;

err = make_checksum_v2(kctx, NULL, 0, buf,
- offset + GSS_KRB5_TOK_HDR_LEN, cksumkey, &hmac);
+ offset + GSS_KRB5_TOK_HDR_LEN,
+ cksumkey, usage, &hmac);
buf->pages = save_pages;
if (err)
return GSS_S_FAILURE;
@@ -655,15 +659,18 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf,
u8 pkt_hmac[GSS_KRB5_MAX_CKSUM_LEN];
int nblocks, blocksize, cbcbytes;
struct decryptor_desc desc;
+ unsigned int usage;

if (kctx->initiate) {
cipher = kctx->acceptor_enc;
aux_cipher = kctx->acceptor_enc_aux;
cksum_key = kctx->acceptor_integ;
+ usage = KG_USAGE_ACCEPTOR_SEAL;
} else {
cipher = kctx->initiator_enc;
aux_cipher = kctx->initiator_enc_aux;
cksum_key = kctx->initiator_integ;
+ usage = KG_USAGE_INITIATOR_SEAL;
}
blocksize = crypto_blkcipher_blocksize(cipher);

@@ -706,7 +713,7 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf,
our_hmac_obj.data = our_hmac;

ret = make_checksum_v2(kctx, NULL, 0, &subbuf, 0,
- cksum_key, &our_hmac_obj);
+ cksum_key, usage, &our_hmac_obj);
if (ret)
goto out_err;

diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c
index a95e4dd..eb18930 100644
--- a/net/sunrpc/auth_gss/gss_krb5_seal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -143,7 +143,8 @@ gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
else
cksumkey = NULL;

- if (make_checksum(ctx, ptr, 8, text, 0, cksumkey, &md5cksum))
+ if (make_checksum(ctx, ptr, 8, text, 0, cksumkey,
+ KG_USAGE_SIGN, &md5cksum))
return GSS_S_FAILURE;

memcpy(ptr + GSS_KRB5_TOK_HDR_LEN, md5cksum.data, md5cksum.len);
@@ -171,6 +172,7 @@ gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
s32 now;
u64 seq_send;
u8 *cksumkey;
+ unsigned int cksum_usage;

dprintk("RPC: %s\n", __func__);

@@ -183,13 +185,16 @@ gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
spin_unlock(&krb5_seq_lock);
*((u64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);

- if (ctx->initiate)
+ if (ctx->initiate) {
cksumkey = ctx->initiator_sign;
- else
+ cksum_usage = KG_USAGE_INITIATOR_SIGN;
+ } else {
cksumkey = ctx->acceptor_sign;
+ cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+ }

if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
- text, 0, cksumkey, &cksumobj))
+ text, 0, cksumkey, cksum_usage, &cksumobj))
return GSS_S_FAILURE;

memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
diff --git a/net/sunrpc/auth_gss/gss_krb5_unseal.c b/net/sunrpc/auth_gss/gss_krb5_unseal.c
index 5305b02..5491886 100644
--- a/net/sunrpc/auth_gss/gss_krb5_unseal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_unseal.c
@@ -116,7 +116,7 @@ gss_verify_mic_v1(struct krb5_ctx *ctx,
cksumkey = NULL;

if (make_checksum(ctx, ptr, 8, message_buffer, 0,
- cksumkey, &md5cksum))
+ cksumkey, KG_USAGE_SIGN, &md5cksum))
return GSS_S_FAILURE;

if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
@@ -155,6 +155,7 @@ gss_verify_mic_v2(struct krb5_ctx *ctx,
u8 *cksumkey;
u8 flags;
int i;
+ unsigned int cksum_usage;

dprintk("RPC: %s\n", __func__);

@@ -175,13 +176,16 @@ gss_verify_mic_v2(struct krb5_ctx *ctx,
if (ptr[i] != 0xff)
return GSS_S_DEFECTIVE_TOKEN;

- if (ctx->initiate)
+ if (ctx->initiate) {
cksumkey = ctx->acceptor_sign;
- else
+ cksum_usage = KG_USAGE_ACCEPTOR_SIGN;
+ } else {
cksumkey = ctx->initiator_sign;
+ cksum_usage = KG_USAGE_INITIATOR_SIGN;
+ }

if (make_checksum_v2(ctx, ptr, GSS_KRB5_TOK_HDR_LEN, message_buffer, 0,
- cksumkey, &cksumobj))
+ cksumkey, cksum_usage, &cksumobj))
return GSS_S_FAILURE;

if (memcmp(cksumobj.data, ptr + GSS_KRB5_TOK_HDR_LEN,
diff --git a/net/sunrpc/auth_gss/gss_krb5_wrap.c b/net/sunrpc/auth_gss/gss_krb5_wrap.c
index 2a18a15..c8c402b 100644
--- a/net/sunrpc/auth_gss/gss_krb5_wrap.c
+++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c
@@ -216,7 +216,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
tmp_pages = buf->pages;
buf->pages = pages;
if (make_checksum(kctx, ptr, 8, buf, offset + headlen - blocksize,
- cksumkey, &md5cksum))
+ cksumkey, KG_USAGE_SEAL, &md5cksum))
return GSS_S_FAILURE;
buf->pages = tmp_pages;

@@ -299,7 +299,7 @@ gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)
cksumkey = NULL;

if (make_checksum(kctx, ptr, 8, buf, crypt_offset,
- cksumkey, &md5cksum))
+ cksumkey, KG_USAGE_SEAL, &md5cksum))
return GSS_S_FAILURE;

if (memcmp(md5cksum.data, ptr + GSS_KRB5_TOK_HDR_LEN,
--
1.6.6.1