gss_krb5: add support for new token formats in rfc4121
This is a step toward support for AES encryption types which are
required to use the new token formats defined in rfc4121.
Signed-off-by: Kevin Coffman <kwc@citi.umich.edu>
[SteveD: Fixed a typo in gss_verify_mic_v2()]
Signed-off-by: Steve Dickson <steved@redhat.com>
[Trond: Got rid of the TEST_ROTATE/TEST_EXTRA_COUNT crap]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/net/sunrpc/auth_gss/gss_krb5_seal.c b/net/sunrpc/auth_gss/gss_krb5_seal.c
index 7ede900..477a546 100644
--- a/net/sunrpc/auth_gss/gss_krb5_seal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -91,6 +91,33 @@
return (char *)krb5_hdr;
}
+static void *
+setup_token_v2(struct krb5_ctx *ctx, struct xdr_netobj *token)
+{
+ __be16 *ptr, *krb5_hdr;
+ u8 *p, flags = 0x00;
+
+ if ((ctx->flags & KRB5_CTX_FLAG_INITIATOR) == 0)
+ flags |= 0x01;
+ if (ctx->flags & KRB5_CTX_FLAG_ACCEPTOR_SUBKEY)
+ flags |= 0x04;
+
+ /* Per rfc 4121, sec 4.2.6.1, there is no header,
+ * just start the token */
+ krb5_hdr = ptr = (__be16 *)token->data;
+
+ *ptr++ = KG2_TOK_MIC;
+ p = (u8 *)ptr;
+ *p++ = flags;
+ *p++ = 0xff;
+ ptr = (__be16 *)p;
+ *ptr++ = 0xffff;
+ *ptr++ = 0xffff;
+
+ token->len = GSS_KRB5_TOK_HDR_LEN + ctx->gk5e->cksumlength;
+ return krb5_hdr;
+}
+
static u32
gss_get_mic_v1(struct krb5_ctx *ctx, struct xdr_buf *text,
struct xdr_netobj *token)
@@ -133,6 +160,45 @@
}
u32
+gss_get_mic_v2(struct krb5_ctx *ctx, struct xdr_buf *text,
+ struct xdr_netobj *token)
+{
+ char cksumdata[GSS_KRB5_MAX_CKSUM_LEN];
+ struct xdr_netobj cksumobj = { .len = sizeof(cksumdata),
+ .data = cksumdata};
+ void *krb5_hdr;
+ s32 now;
+ u64 seq_send;
+ u8 *cksumkey;
+
+ dprintk("RPC: %s\n", __func__);
+
+ krb5_hdr = setup_token_v2(ctx, token);
+
+ /* Set up the sequence number. Now 64-bits in clear
+ * text and w/o direction indicator */
+ spin_lock(&krb5_seq_lock);
+ seq_send = ctx->seq_send64++;
+ spin_unlock(&krb5_seq_lock);
+ *((u64 *)(krb5_hdr + 8)) = cpu_to_be64(seq_send);
+
+ if (ctx->initiate)
+ cksumkey = ctx->initiator_sign;
+ else
+ cksumkey = ctx->acceptor_sign;
+
+ if (make_checksum_v2(ctx, krb5_hdr, GSS_KRB5_TOK_HDR_LEN,
+ text, 0, cksumkey, &cksumobj))
+ return GSS_S_FAILURE;
+
+ memcpy(krb5_hdr + GSS_KRB5_TOK_HDR_LEN, cksumobj.data, cksumobj.len);
+
+ now = get_seconds();
+
+ return (ctx->endtime < now) ? GSS_S_CONTEXT_EXPIRED : GSS_S_COMPLETE;
+}
+
+u32
gss_get_mic_kerberos(struct gss_ctx *gss_ctx, struct xdr_buf *text,
struct xdr_netobj *token)
{
@@ -144,6 +210,9 @@
case ENCTYPE_DES_CBC_RAW:
case ENCTYPE_DES3_CBC_RAW:
return gss_get_mic_v1(ctx, text, token);
+ case ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case ENCTYPE_AES256_CTS_HMAC_SHA1_96:
+ return gss_get_mic_v2(ctx, text, token);
}
}