gssd_krb5: arcfour-hmac support

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>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

5 files changed, 32 insertions, 16 deletions

diff --git a/include/linux/sunrpc/gss_krb5.h b/include/linux/sunrpc/gss_krb5.h
index 43148ec9a46c..633f41f11a40 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 967484a914f3..33ae7023cf3a 100644
--- a/net/sunrpc/auth_gss/gss_krb5_crypto.c
+++ b/net/sunrpc/auth_gss/gss_krb5_crypto.c
@@ -132,7 +132,7 @@ 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];
@@ -208,7 +208,7 @@ 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];
@@ -537,15 +537,18 @@ 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);
 
@@ -590,7 +593,8 @@ 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;
@@ -654,15 +658,18 @@ 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);
 
@@ -705,7 +712,7 @@ 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 477a546d19bb..e22fed3d9a1b 100644
--- a/net/sunrpc/auth_gss/gss_krb5_seal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_seal.c
@@ -142,7 +142,8 @@ 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);
@@ -170,6 +171,7 @@ 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__);
 
@@ -182,13 +184,16 @@ 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 4ede4cc4391f..ef91366e3dea 100644
--- a/net/sunrpc/auth_gss/gss_krb5_unseal.c
+++ b/net/sunrpc/auth_gss/gss_krb5_unseal.c
@@ -115,7 +115,7 @@ 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,
@@ -154,6 +154,7 @@ gss_verify_mic_v2(struct krb5_ctx *ctx,
         u8 *cksumkey;
         u8 flags;
         int i;
+        unsigned int cksum_usage;
 
         dprintk("RPC:       %s\n", __func__);
 
@@ -174,13 +175,16 @@ 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 a1a3585fa761..097cc27494cc 100644
--- a/net/sunrpc/auth_gss/gss_krb5_wrap.c
+++ b/net/sunrpc/auth_gss/gss_krb5_wrap.c
@@ -215,7 +215,7 @@ 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;
 
@@ -298,7 +298,7 @@ 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,