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gss: krb5: remove signalg and sealalg 

We designed the krb5 context import without completely understanding the
context.  Now it's clear that there are a number of fields that we ignore,
or that we depend on having one single value.

In particular, we only support one value of signalg currently; so let's
check the signalg field in the downcall (in case we decide there's
something else we could support here eventually), but ignore it otherwise.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
J. Bruce Fields 2006-12-04 20:22:35 -05:00 committed by Trond Myklebust
parent adeb8133dd
commit e678e06bf8
4 changed files with 21 additions and 47 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/sunrpc/gss_krb5.h
View File

@ -44,7 +44,6 @@ struct krb5_ctx {
int initiate; /* 1 = initiating, 0 = accepting */
int seed_init;
unsigned char seed[16];
int signalg;
int sealalg;
struct crypto_blkcipher *enc;
struct crypto_blkcipher *seq;

5
net/sunrpc/auth_gss/gss_krb5_mech.c
View File

@ -129,6 +129,7 @@ gss_import_sec_context_kerberos(const void *p,
{
const void *end = (const void *)((const char *)p + len);
struct krb5_ctx *ctx;
int tmp;
if (!(ctx = kzalloc(sizeof(*ctx), GFP_KERNEL)))
goto out_err;
@ -142,9 +143,11 @@ gss_import_sec_context_kerberos(const void *p,
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));
p = simple_get_bytes(p, end, &tmp, sizeof(tmp));
if (IS_ERR(p))
goto out_err_free_ctx;
if (tmp != SGN_ALG_DES_MAC_MD5)
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;

32
net/sunrpc/auth_gss/gss_krb5_seal.c
View File

@ -88,15 +88,7 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
now = get_seconds();
switch (ctx->signalg) {
case SGN_ALG_DES_MAC_MD5:
checksum_type = CKSUMTYPE_RSA_MD5;
break;
default:
dprintk("RPC: gss_krb5_seal: ctx->signalg %d not"
" supported\n", ctx->signalg);
goto out_err;
}
checksum_type = CKSUMTYPE_RSA_MD5;
if (ctx->sealalg != SEAL_ALG_NONE && ctx->sealalg != SEAL_ALG_DES) {
dprintk("RPC: gss_krb5_seal: ctx->sealalg %d not supported\n",
ctx->sealalg);
@ -115,24 +107,18 @@ gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
krb5_hdr = ptr - 2;
msg_start = krb5_hdr + 24;
*(__be16 *)(krb5_hdr + 2) = htons(ctx->signalg);
*(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
memset(krb5_hdr + 4, 0xff, 4);
if (make_checksum(checksum_type, krb5_hdr, 8, text, 0, &md5cksum))
goto out_err;
goto out_err;
switch (ctx->signalg) {
case SGN_ALG_DES_MAC_MD5:
if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
md5cksum.data, md5cksum.len))
goto out_err;
memcpy(krb5_hdr + 16,
md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
KRB5_CKSUM_LENGTH);
break;
default:
BUG();
}
if (krb5_encrypt(ctx->seq, NULL, md5cksum.data,
md5cksum.data, md5cksum.len))
goto out_err;
memcpy(krb5_hdr + 16,
md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
KRB5_CKSUM_LENGTH);
spin_lock(&krb5_seq_lock);
seq_send = ctx->seq_send++;

30
net/sunrpc/auth_gss/gss_krb5_wrap.c
View File

@ -134,15 +134,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
now = get_seconds();
switch (kctx->signalg) {
case SGN_ALG_DES_MAC_MD5:
checksum_type = CKSUMTYPE_RSA_MD5;
break;
default:
dprintk("RPC: gss_krb5_seal: kctx->signalg %d not"
" supported\n", kctx->signalg);
goto out_err;
}
checksum_type = CKSUMTYPE_RSA_MD5;
if (kctx->sealalg != SEAL_ALG_NONE && kctx->sealalg != SEAL_ALG_DES) {
dprintk("RPC: gss_krb5_seal: kctx->sealalg %d not supported\n",
kctx->sealalg);
@ -177,7 +169,7 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
msg_start = krb5_hdr + 24;
/* XXXJBF: */ BUG_ON(buf->head[0].iov_base + offset + headlen != msg_start + blocksize);
*(__be16 *)(krb5_hdr + 2) = htons(kctx->signalg);
*(__be16 *)(krb5_hdr + 2) = htons(SGN_ALG_DES_MAC_MD5);
memset(krb5_hdr + 4, 0xff, 4);
*(__be16 *)(krb5_hdr + 4) = htons(kctx->sealalg);
@ -191,18 +183,12 @@ gss_wrap_kerberos(struct gss_ctx *ctx, int offset,
goto out_err;
buf->pages = tmp_pages;
switch (kctx->signalg) {
case SGN_ALG_DES_MAC_MD5:
if (krb5_encrypt(kctx->seq, NULL, md5cksum.data,
md5cksum.data, md5cksum.len))
goto out_err;
memcpy(krb5_hdr + 16,
md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
KRB5_CKSUM_LENGTH);
break;
default:
BUG();
}
if (krb5_encrypt(kctx->seq, NULL, md5cksum.data,
md5cksum.data, md5cksum.len))
goto out_err;
memcpy(krb5_hdr + 16,
md5cksum.data + md5cksum.len - KRB5_CKSUM_LENGTH,
KRB5_CKSUM_LENGTH);
spin_lock(&krb5_seq_lock);
seq_send = kctx->seq_send++;