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gss_krb5: Use confounder length in wrap code

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All encryption types use a confounder at the beginning of the
wrap token.  In all encryption types except arcfour-hmac, the
confounder is the same as the blocksize.  arcfour-hmac has a
blocksize of one, but uses an eight byte confounder.

Add an entry to the crypto framework definitions for the
confounder length and change the wrap/unwrap code to use
the confounder length rather than assuming it is always
the blocksize.

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>
This commit is contained in:
Kevin Coffman 2010-03-17 13:03:05 -04:00 committed by Trond Myklebust
parent 1dbd9029f3
commit 5af46547ec
4 changed files with 17 additions and 8 deletions
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3
include/linux/sunrpc/gss_krb5.h
View File

@ -64,6 +64,9 @@ struct gss_krb5_enctype {
const u16 signalg; /* signing algorithm */
const u16 sealalg; /* sealing algorithm */
const u32 blocksize; /* encryption blocksize */
const u32 conflen; /* confounder length
(normally the same as
the blocksize) */
const u32 cksumlength; /* checksum length */
const u32 keyed_cksum; /* is it a keyed cksum? */
const u32 keybytes; /* raw key len, in bytes */

6
net/sunrpc/auth_gss/gss_krb5_crypto.c
View File

@ -554,9 +554,9 @@ gss_krb5_aes_encrypt(struct krb5_ctx *kctx, u32 offset,
/* hide the gss token header and insert the confounder */
offset += GSS_KRB5_TOK_HDR_LEN;
if (xdr_extend_head(buf, offset, blocksize))
if (xdr_extend_head(buf, offset, kctx->gk5e->conflen))
return GSS_S_FAILURE;
gss_krb5_make_confounder(buf->head[0].iov_base + offset, blocksize);
gss_krb5_make_confounder(buf->head[0].iov_base + offset, kctx->gk5e->conflen);
offset -= GSS_KRB5_TOK_HDR_LEN;
if (buf->tail[0].iov_base != NULL) {
@ -726,7 +726,7 @@ gss_krb5_aes_decrypt(struct krb5_ctx *kctx, u32 offset, struct xdr_buf *buf,
ret = GSS_S_BAD_SIG;
goto out_err;
}
*headskip = crypto_blkcipher_blocksize(cipher);
*headskip = kctx->gk5e->conflen;
*tailskip = kctx->gk5e->cksumlength;
out_err:
if (ret && ret != GSS_S_BAD_SIG)

4
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -68,6 +68,7 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
.keybytes = 7,
.keylength = 8,
.blocksize = 8,
.conflen = 8,
.cksumlength = 8,
.keyed_cksum = 0,
},
@ -88,6 +89,7 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
.keybytes = 21,
.keylength = 24,
.blocksize = 8,
.conflen = 8,
.cksumlength = 20,
.keyed_cksum = 1,
},
@ -110,6 +112,7 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
.keybytes = 16,
.keylength = 16,
.blocksize = 16,
.conflen = 16,
.cksumlength = 12,
.keyed_cksum = 1,
},
@ -132,6 +135,7 @@ static const struct gss_krb5_enctype supported_gss_krb5_enctypes[] = {
.keybytes = 32,
.keylength = 32,
.blocksize = 16,
.conflen = 16,
.cksumlength = 12,
.keyed_cksum = 1,
},

12
net/sunrpc/auth_gss/gss_krb5_wrap.c
View File

@ -168,6 +168,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
struct page **tmp_pages;
u32 seq_send;
u8 *cksumkey;
u32 conflen = kctx->gk5e->conflen;
dprintk("RPC: %s\n", __func__);
@ -176,7 +177,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
blocksize = crypto_blkcipher_blocksize(kctx->enc);
gss_krb5_add_padding(buf, offset, blocksize);
BUG_ON((buf->len - offset) % blocksize);
plainlen = blocksize + buf->len - offset;
plainlen = conflen + buf->len - offset;
headlen = g_token_size(&kctx->mech_used,
GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength + plainlen) -
@ -204,7 +205,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
memset(ptr + 4, 0xff, 4);
*(__be16 *)(ptr + 4) = cpu_to_le16(kctx->gk5e->sealalg);
gss_krb5_make_confounder(msg_start, blocksize);
gss_krb5_make_confounder(msg_start, conflen);
if (kctx->gk5e->keyed_cksum)
cksumkey = kctx->cksum;
@ -214,7 +215,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
/* XXXJBF: UGH!: */
tmp_pages = buf->pages;
buf->pages = pages;
if (make_checksum(kctx, ptr, 8, buf, offset + headlen - blocksize,
if (make_checksum(kctx, ptr, 8, buf, offset + headlen - conflen,
cksumkey, KG_USAGE_SEAL, &md5cksum))
return GSS_S_FAILURE;
buf->pages = tmp_pages;
@ -231,7 +232,7 @@ gss_wrap_kerberos_v1(struct krb5_ctx *kctx, int offset,
seq_send, ptr + GSS_KRB5_TOK_HDR_LEN, ptr + 8)))
return GSS_S_FAILURE;
if (gss_encrypt_xdr_buf(kctx->enc, buf, offset + headlen - blocksize,
if (gss_encrypt_xdr_buf(kctx->enc, buf, offset + headlen - conflen,
pages))
return GSS_S_FAILURE;
@ -254,6 +255,7 @@ gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)
void *data_start, *orig_start;
int data_len;
int blocksize;
u32 conflen = kctx->gk5e->conflen;
int crypt_offset;
u8 *cksumkey;
@ -327,7 +329,7 @@ gss_unwrap_kerberos_v1(struct krb5_ctx *kctx, int offset, struct xdr_buf *buf)
blocksize = crypto_blkcipher_blocksize(kctx->enc);
data_start = ptr + (GSS_KRB5_TOK_HDR_LEN + kctx->gk5e->cksumlength) +
blocksize;
conflen;
orig_start = buf->head[0].iov_base + offset;
data_len = (buf->head[0].iov_base + buf->head[0].iov_len) - data_start;
memmove(orig_start, data_start, data_len);